U.S. patent application number 16/208588 was filed with the patent office on 2020-02-20 for synthetic ammonia system for making hydrogen by electrolysis in thermal power plant.
This patent application is currently assigned to HEPU Technology Development (Beijing) Co., LTD.. The applicant listed for this patent is HEPU Technology Development (Beijing) Co., LTD.. Invention is credited to Hui Chen, Hua Cui, Zhi Tan, Bo Xu, Yusen Yang.
Application Number | 20200056290 16/208588 |
Document ID | / |
Family ID | 64080093 |
Filed Date | 2020-02-20 |
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United States Patent
Application |
20200056290 |
Kind Code |
A1 |
Yang; Yusen ; et
al. |
February 20, 2020 |
SYNTHETIC AMMONIA SYSTEM FOR MAKING HYDROGEN BY ELECTROLYSIS IN
THERMAL POWER PLANT
Abstract
The present invention discloses a synthetic ammonia system for
making hydrogen by electrolysis in a thermal power plant includes
an electrolytic hydrogen making device and a synthetic ammonia
equipment; a power input end of the electrolytic hydrogen making
device is electrically connected with a power generation output end
of the thermal power plant; a hydrogen output end of the
electrolysis hydrogen making device is connected with a hydrogen
inlet of the synthetic ammonia equipment, a nitrogen inlet of the
synthetic ammonia equipment is connected with a nitrogen source,
the synthetic ammonia equipment is used for using the hydrogen
produced by the electrolysis hydrogen making device and nitrogen of
the nitrogen source to synthesize ammonia; an ammonia output end of
the synthetic ammonia equipment is communicated to an ammonia
supply pipeline and/or a liquid ammonia tank of the thermal power
plant.
Inventors: |
Yang; Yusen; (BEIJING,
CN) ; Chen; Hui; (BEIJING, CN) ; Cui; Hua;
(BEIJING, CN) ; Xu; Bo; (BEIJING, CN) ;
Tan; Zhi; (BEIJING, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HEPU Technology Development (Beijing) Co., LTD. |
Beijing |
|
CN |
|
|
Assignee: |
HEPU Technology Development
(Beijing) Co., LTD.
Beijing
CN
|
Family ID: |
64080093 |
Appl. No.: |
16/208588 |
Filed: |
December 4, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C01B 3/025 20130101;
C01B 13/0207 20130101; H02J 3/24 20130101; C01C 1/0405 20130101;
C01B 2203/068 20130101; H02J 15/00 20130101; C01C 1/04 20130101;
H02J 3/28 20130101; C25B 15/08 20130101; C25B 1/04 20130101 |
International
Class: |
C25B 1/04 20060101
C25B001/04; C01B 3/02 20060101 C01B003/02 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 14, 2018 |
CN |
201810922444.9 |
Claims
1. A synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant, comprising an electrolytic hydrogen
making device and a synthetic ammonia equipment; a power input end
of the electrolytic hydrogen making device is electrically
connected with a power generation output end of the thermal power
plant, so as to use peak regulation balance electric quantity of
the thermal power plant to produce hydrogen and oxygen for power
supply electrolysis; a hydrogen output end of the electrolysis
hydrogen making device is connected with a hydrogen inlet of the
synthetic ammonia equipment, a nitrogen inlet of the synthetic
ammonia equipment is connected with a nitrogen source, the
synthetic ammonia equipment is used for using the hydrogen produced
by the electrolysis hydrogen making device and nitrogen of the
nitrogen source to synthesize ammonia; an ammonia output end of the
synthetic ammonia equipment is communicated to an ammonia supply
pipeline and/or a liquid ammonia tank of the thermal power plant;
the ammonia supply pipeline is communicated to a multifuel burner
of a hearth of a boiler of the thermal power plant, for taking part
in the hearth burning as fuel, and/or into a SCR working surface of
a flue gas cleaning denitration device at a rear gas flue of the
boiler of the thermal power plant.
2. (canceled)
3. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 1, wherein the nitrogen
source includes a space division device, a power input end of the
space division device is connected to a power generation output end
of the thermal power plant, so as to obtain the peak regulation
balance electric quantity of the thermal power plant as a power
supply, and a nitrogen output end is connected with a nitrogen
inlet of the synthetic ammonia equipment.
4. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 1, wherein an oxygen
output end of the electrolysis hydrogen making device is
communicated with an oxygen storage tank; a hydrogen output end of
the electrolysis hydrogen making device is connected to a hydrogen
storage tank by an ultralow temperature liquefying device or a high
pressure gas compression device, for outputting the hydrogen which
is not input to the synthetic ammonia equipment in a state of
ultralow temperature liquid hydrogen or high pressure compression
gaseous hydrogen to the hydrogen storage tank.
5. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 4, wherein a hydrogen
output end of the electrolysis hydrogen making device or the
hydrogen storage tank is communicated to an external hydrogen
transporting pipeline, and directly transports the hydrogen
externally by the external hydrogen transporting pipeline.
6. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 3, wherein an oxygen
output end of the space division device is communicated to an
oxygen storage tank, and a nitrogen output end of the space
division device is also communicated to the nitrogen storage tank,
for outputting nitrogen which is not input to the synthetic ammonia
equipment to the nitrogen storage tank.
7. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 1, wherein the
electrolysis hydrogen making device is alkaline aqueous solution
type, a solid polymer type or a high temperature solid oxide
type.
8. The synthetic ammonia system for making hydrogen by electrolysis
in a thermal power plant according to claim 1, wherein a water
inlet of the electrolysis hydrogen making device is communicated
with a chemical water treatment workshop of the thermal power plant
by a make-up pump, and the chemical water treatment workshop of the
thermal power plant is communicated with the make-up pump by a
purified water preparing device.
9. A peak regulation and frequency modulation electrochemical
plant, comprising the synthetic ammonia system for making hydrogen
by electrolysis in a thermal power plant according to claim 1, with
a resultant product of one or more of electric power, thermal
power, hydrogen, nitrogen, oxygen and ammonia, which is connected
to a corresponding gas storage device by a gas purifying device
respectively, so as to implement low temperature liquidation or
high pressure storage of one or more of hydrogen, nitrogen, oxygen
and ammonia.
10. The peak regulation and frequency modulation electrochemical
plant according to claim 9, wherein a production device for one or
more of hydrogen, nitrogen, oxygen and ammonia is connected with
the corresponding high pressure or low temperature liquefied
petroleum gas cylinder bottling device by the gas purifying device,
which may sell one or more of the gaseous products of hydrogen,
nitrogen, oxygen and ammonia.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims the benefit of priority to
Chinese patent application No. 201810922444.9, titled " SYNTHETIC
AMMONIA SYSTEM FOR MAKING HYDROGEN BY ELECTROLYSIS IN THERMAL POWER
PLANT", filed with the Chinese State Intellectual Property Office
on Aug. 14, 2018, the entire disclosure of which is incorporated
herein by reference.
FILED OF THE INVENTION
[0002] The present invention relates to the field of electrical
energy and synthetic ammonia technologies, and in particular to a
synthetic ammonia system for making hydrogen by electrolysis in a
thermal power plant.
BACKGROUND OF THE INVENTION
[0003] At the present stage, in Chinese electrical power systems,
there is an abundant electricity production capacity but a lack of
a peak regulation power supply such as a gas turbine and pumped
storage, so the obvious contradiction occurs between grid peak
regulation and thermal power generating unit flexibility, and the
ability of grid consuming wind electricity, photoelectricity,
hydropower and nuclear power is insufficient.
[0004] In a related art, the peak regulation in the thermal power
plant has been a salient contradiction in the grid operation.
Currently, the Chinese thermal power flexibility peak regulation
transformation is targeted at heat supply units in winter. However,
how to adjust a peak in summer is a problem many thermal power
plants facing. In order to meet the requirement of grid peak
regulation, reduce the energy waste during the peak regulation to
maximum extent, and make the power plants survive in fierce
competition, the deep reformation of peak regulation should be
performed.
[0005] On the other hand, carbon emission reduction would exert
increasing pressure on the thermal power plant. In order to solve
the problems of wind and light curtailment, thermal power
flexibility peak regulation and carbon emission reduction, it is
necessary for thermal power units to solve these problems.
[0006] As a most promising hydrogen making technology on a big
scale, the electrolytic hydrogen making is efficient and clean,
with a simple process and high product purity up to 99.9% (hydrogen
and oxygen). Especially, with the increase in the clean power
generation, hydrogen will become an ideal carrier for storing
electric energy. By implementing the clean power generation and
applying the water-electrolytic hydrogen making technology, the
electric energy generated by the clean energy is converted into
hydrogen energy to be stored, or as needed, the hydrogen energy is
converted into methane, methyl alcohol and other liquid fuel by the
subsequent chemical process.
[0007] Ammonia is a very important chemical product for human. With
the social development and progress in industrial civilization, a
synthetic ammonia product has obvious contributions to human. As
hydrogen storage fuel which is transported conveniently, many
research units and energy companies think that ammonia is
promising. Ammonia may be liquefied at a temperature of 20 degrees
centigrade below zero, and thus may be transported conveniently
with low costs; in addition, ammonia is also a fuel and
refrigerant, not only for burning, but also for cooling. Currently,
ammonia is mainly used for a SCR denitration system.
SUMMARY OF THE INVENTION
[0008] In view of defects in the related art, the present invention
is directed to providing a synthetic ammonia system for making
hydrogen by electrolysis in a thermal power plant, which implements
electrolytic hydrogen making and space division nitrogen and oxygen
making by using peak regulation and frequency modulation power,
then produces ammonia by the synthetic ammonia process using the
resultant nitrogen and hydrogen, such that the power plant turns
into an electrochemical plant of various gas and fuel products.
[0009] In order to realize the above purpose, the present invention
utilizes the following technical solutions.
[0010] A synthetic ammonia system for making hydrogen by
electrolysis in a thermal power plant includes an electrolytic
hydrogen making device and a synthetic ammonia equipment; a power
input end of the electrolytic hydrogen making device is
electrically connected with a power generation output end of the
thermal power plant, so as to use peak regulation balance electric
quantity of the thermal power plant to produce hydrogen and oxygen
for power supply electrolysis; a hydrogen output end of the
electrolysis hydrogen making device is connected with a hydrogen
inlet of the synthetic ammonia equipment, a nitrogen inlet of the
synthetic ammonia equipment is connected with a nitrogen source,
the synthetic ammonia equipment is used for using the hydrogen
produced by the electrolysis hydrogen making device and nitrogen of
the nitrogen source to synthesize ammonia; an ammonia output end of
the synthetic ammonia equipment is communicated to an ammonia
supply pipeline and/or a liquid ammonia tank of the thermal power
plant.
[0011] Further, the ammonia supply pipeline is communicated to a
multifuel burner of a hearth of a boiler of the thermal power
plant, for taking part in the hearth burning as fuel, and/or into a
SCR working surface of a flue gas cleaning denitration device at a
rear gas flue of the boiler of the thermal power plant.
[0012] Further, the nitrogen source includes a space division
device, a power input end of the space division device is connected
to a power generation output end of the thermal power plant, so as
to obtain the peak regulation balance electric quantity of the
thermal power plant as a power supply, and a nitrogen output end is
connected with a nitrogen inlet of the synthetic ammonia
equipment.
[0013] Further, an oxygen output end of the electrolysis hydrogen
making device is communicated with an oxygen storage tank; a
hydrogen output end of the electrolysis hydrogen making device is
connected to a hydrogen storage tank by an ultralow temperature
liquefying device or a high pressure gas compression device, for
outputting the hydrogen which is not input to the synthetic ammonia
equipment in a state of ultralow temperature liquid hydrogen or
high pressure compression gaseous hydrogen to the hydrogen storage
tank.
[0014] Further, a hydrogen output end of the electrolysis hydrogen
making device or the hydrogen storage tank is communicated to an
external hydrogen transporting pipeline, and directly transports
the hydrogen externally by the external hydrogen transporting
pipeline.
[0015] Further, an oxygen output end of the space division device
is communicated to an oxygen storage tank, and a nitrogen output
end of the space division device is also communicated to the
nitrogen storage tank, for outputting nitrogen which is not input
to the synthetic ammonia equipment to the nitrogen storage
tank.
[0016] Further, the electrolysis hydrogen making device is alkaline
aqueous solution type, a solid polymer type or a high temperature
solid oxide type.
[0017] Further, a water inlet of the electrolysis hydrogen making
device is communicated with a chemical water treatment workshop of
the thermal power plant by a make-up pump, and the chemical water
treatment workshop of the thermal power plant is communicated with
the make-up pump by a purified water preparing device.
[0018] The present invention further provides a peak regulation and
frequency modulation electrochemical plant, which has the
above-mentioned synthetic ammonia system for making hydrogen by
electrolysis in a thermal power plant, with a resultant product of
one or more of electric power, thermal power, hydrogen, nitrogen,
oxygen and ammonia, which is connected to the corresponding gas
storage device by a gas purifying device respectively, so as to
implement low temperature liquidation or high pressure storage of
one or more of hydrogen, nitrogen, oxygen and ammonia.
[0019] Further, the production device for one or more of hydrogen,
nitrogen, oxygen and ammonia is connected with the corresponding
high pressure or low temperature liquefied petroleum gas cylinder
bottling device by the gas purifying device, which may sell one or
more of the gaseous products of hydrogen, nitrogen, oxygen and
ammonia.
[0020] The present invention has the beneficial effects that by the
above-mentioned synthetic ammonia system for making hydrogen by
electrolysis in a thermal power plant, which implements hydrogen
and nitrogen making in the power plant by taking full advantage of
peak regulation and frequency modulation power, then produces
ammonia by the synthetic ammonia process using the resultant
nitrogen and hydrogen, such that the thermal power plant turns into
an electrochemical plant of various gas and fuel products (ammonia
and hydrogen is taken as fuel to replace coal, and various gases
such as hydrogen, nitrogen, ammonia and oxygen may be on sale and
output). Especially, hydrogen and ammonia is taken as fuel with
zero carbon emission, certainly with broad application prospects in
the future.
[0021] The synthetic ammonia system for making hydrogen by
electrolysis in a thermal power plant according to the present
invention acquires electric energy at a low ebb, converts its
electric energy into hydrogen energy, and then performs synthetic
ammonia process on hydrogen energy and nitrogen, thereby converting
hydrogen energy into chemical energy of ammonia fuel easy to
transport and store, which not only realize electric energy storage
in disguised form, but also transform the traditional thermal power
plant into an energy plant for producing various gaseous
products.
[0022] In addition, the synthetic ammonia system for making
hydrogen by electrolysis in a thermal power plant according to the
present invention may directly consume the peak regulation balance
electric quantity of the power plant, indirectly uses wind, light,
water and nuclear power curtailment, alleviates the problems of
grid balance and peak and valley difference, prolongs the service
life of the power plant equipment, implements the disguised storage
of electricity energy, and realizes the stable storage of energy
and effective usage.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is a structural schematic diagram of a first
embodiment according to the present invention;
[0024] FIG. 2 is a structural schematic diagram of a second
embodiment according to the present invention; and
[0025] FIG. 3 is a structural schematic diagram of a third
embodiment according to the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] The present invention will be further described in
combination with drawings. It should be noted that the embodiment
provides detailed implementation modes and specific operation
process by taking the present technical solution as a premise.
However, the protection scope of the present invention is not
limited the present embodiment.
First Embodiment
[0027] As shown in FIG. 1, a synthetic ammonia system for making
hydrogen by electrolysis in a thermal power plant includes an
electrolytic hydrogen making device 1 and a synthetic ammonia
equipment 2; a power input end of the electrolytic hydrogen making
device 1 is electrically connected with a power generation output
end of the thermal power plant; a hydrogen output end of the
electrolysis hydrogen making device 1 is connected with a hydrogen
inlet of the synthetic ammonia equipment 2, a nitrogen inlet of the
synthetic ammonia equipment 2 is connected with a nitrogen source;
an ammonia output end of the synthetic ammonia equipment 2 is
communicated to an ammonia supply pipeline and a liquid ammonia
tank 12 of the thermal power plant. The ammonia supply pipeline may
include an ammonia supply pipeline and a liquid ammonia supply
pipeline.
[0028] The above-mentioned synthetic ammonia system for making
hydrogen by electrolysis in a thermal power plant has the following
working principal. Usually, a grid control center sends a peak
regulation load instruction to a power plant centralized control
center of the thermal power plant according to a real-time power
generation and peak regulation load requirement in a region, and
the centralized control center of the thermal power plant controls
and adjusts the peak regulation and frequency modulation balance
electricity quantity of the thermal power plant according to the
peak regulation load instruction. In the above-mentioned synthetic
ammonia system for making hydrogen by electrolysis in a thermal
power plant, the peak regulation and frequency modulation balance
electric quantity of the thermal power plant provides power supply
for the electrolysis hydrogen making device, and the hydrogen made
by the electrolysis hydrogen making device is transported to the
synthetic ammonia equipment. After the synthetic ammonia equipment
obtains hydrogen from the electrolysis hydrogen making device and
nitrogen from a nitrogen source, and makes ammonia at a high
temperature and a high pressure, the ammonia supply pipeline of the
thermal power plant provides the ammonia to various systems needing
ammonia of the thermal power plant. The extra ammonia may be stored
in the liquid ammonia storage tank 12, is liquefied at a low
temperature to the liquid ammonia, and bottled to be on sale.
[0029] With the above-mentioned synthetic ammonia system for making
hydrogen by electrolysis in a thermal power plant, the hydrogen
prepared by the peak regulation and frequency modulation balance
electric quantity of the thermal power plant may be used to
synthesize into ammonia, thereby providing ammonia for various
systems needing ammonia of the thermal power plant, and realizes
cyclic utilization and transformation of energy.
[0030] Usually, a power generation device of the thermal power
plant is a thermal power generation unit, including an electric
generator 101, a steam turbine 102, a condenser 103, a low pressure
heater 104, a deaerator 105, a high pressure heater 106 and a
boiler 107; a power input end of the electrolysis hydrogen making
device 1 is connected to a power output end of the electric
generator 101, and the electric generator 101 provides a power
supply for the electrolysis hydrogen making device 1 using the peak
regulation and frequency modulation balance electric quantity.
[0031] Further, the ammonia supply pipeline is communicated to a
multifuel burner 110 of a hearth of a boiler 107 of the thermal
power plant, for taking part in the hearth burning as fuel, and/or
into a SCR working surface 108 of a flue gas cleaning denitration
device at a rear gas flue of the boiler of the thermal power
plant.
[0032] The ammonia enters the multifuel burner of the hearth of the
boiler to be fuel and burnt in the hearth, partially replacing
coal, which may reduce the boiler coal amount and CO.sub.2 emission
load. The liquid ammonia leads to the SCR working surface of a flue
gas cleaning denitration device, and performs ammonia spraying
process on the SCR working surface. In the present embodiment, the
liquid ammonia supply pipeline firstly leads to the ammonia
spraying device 109, and to the SCR working surface by the ammonia
spraying device.
[0033] The nitrogen in the nitrogen source may be directly
purchased on the market. In the present embodiment, the nitrogen
source includes a space division device 3, and a power input end of
the space division device 3 is connected to a power generation
output end (the electric generator 101 in the present embodiment)
of the thermal power plant, and a nitrogen output end is connected
with a nitrogen inlet of the synthetic ammonia equipment 2.
[0034] The space division device 3 is used to make nitrogen, by
taking the peak regulation and frequency modulation balance
electric quantity of the thermal power plant as the electric energy
source, which may save the cost of purchasing nitrogen on the
market, further taking full advantage of the balance electric
quantity of the thermal power plant, and improving energy
utilization rate. In practical applications, a copious cooling
space division nitrogen making device, a pressure swing adsorption
space division device or a film separation space division device
may be used.
[0035] Further, an oxygen output end of the electrolysis hydrogen
making device 1 is communicated with one oxygen storing tank 4.
Further, the oxygen output end of the space division device 3 is
also connected to the above-mentioned oxygen storing tank 4. The
oxygen generated during the hydrogen and nitrogen making process is
stored in the oxygen storage tank, is on sale after bottled, and
may also provide oxygen for the boiler burning.
[0036] A hydrogen output end of the electrolysis hydrogen making
device 1 is also connected to a hydrogen storage tank 5 by an
ultralow temperature liquefying device or a high pressure gas
compression device, for outputting the hydrogen which is not input
to the synthetic ammonia equipment in a state of ultralow
temperature liquid hydrogen or high pressure compression gaseous
hydrogen to the hydrogen storage tank 5. The hydrogen not used for
preparing ammonia immediately during the hydrogen making may be
firstly stored in the hydrogen storage tank 5, which not only
provides fuel for the boiler burning, but also may be on sale,
providing hydrogen for the subsequent ammonia preparation.
[0037] Further, a hydrogen output end of the electrolysis hydrogen
making device or a hydrogen storage tank may also be communicated
to an external hydrogen transporting pipeline, and directly
transports the hydrogen externally by the external hydrogen
transporting pipeline.
[0038] The electrolysis hydrogen making device 1 and the space
division device 3 may introduce hydrogen and nitrogen to the
synthetic ammonia equipment 2 through a flow valve respectively.
The flow valve may introduce hydrogen and nitrogen into the
synthetic ammonia equipment according to a preset ratio of hydrogen
to nitrogen, which not only ensures effects of making ammonia, but
also not wastes hydrogen and nitrogen.
[0039] Further, a nitrogen output end of the space division device
3 is also communicated to a nitrogen storage tank 6, for outputting
nitrogen which is not input to the synthetic ammonia equipment to
the nitrogen storage tank 6. Similarly, the hydrogen not used for
preparing ammonia immediately during the hydrogen making may be
firstly stored in the nitrogen storage tank 6, which may not only
be bottled to be on sale, but also provide nitrogen for the
subsequent ammonia preparation.
[0040] Further, the electrolysis hydrogen making device 1 may be an
alkaline aqueous solution type, a solid polymer type or a high
temperature solid oxide type.
[0041] Further, a water inlet of the electrolysis hydrogen making
device 1 is communicated with a chemical water treatment workshop 8
by a make-up pump 7, and the chemical water treatment workshop 8 of
the thermal power plant is communicated with the make-up pump 7 by
a purified water preparing device 9.
[0042] Further, the electric generation output end of the thermal
power plant (the output end of the electric generator 101 in the
present embodiment) is electrically connected to a power supply
input end of the electrolysis hydrogen making device 1 through an
inverter 10, and the generator output end of the thermal power
plant is also electrically connected with the power supply input
end of the space division device 3 through another inverter 11.
[0043] The synthetic ammonia equipment 2 may be communicated with
the ammonia supply pipeline through the ammonia flow control
valve.
Second Embodiment
[0044] As shown in FIG. 2, in the present embodiment, a grid
control center sends a peak regulation load instruction to a power
plant centralized control center of the thermal power plant
according to a real-time power generation and peak regulation load
requirement in a region, and the centralized control center of the
thermal power plant controls and adjusts the peak regulation and
frequency modulation balance electricity quantity of the thermal
power plant according to the peak regulation load instruction. The
peak regulation and frequency modulation balance electric quantity
of the thermal power plant provides power supply for the
electrolysis hydrogen making device 1 by the electric generation
device of the thermal power plant, and the hydrogen made by the
electrolysis hydrogen making device is transported to the synthetic
ammonia equipment 2.
[0045] The nitrogen is made by the space division device 3, a power
input end of the space division device 3 is connected to a power
generation output end (the output end of the electric generator 101
in the present embodiment) of the thermal power plant, and a
nitrogen output end is connected with a nitrogen inlet of the
synthetic ammonia equipment 2. The electric generation device may
provide a power supply for the space division device 3 using
balance electric quantity.
[0046] After the synthetic ammonia equipment obtains hydrogen from
the electrolysis hydrogen making device and nitrogen from a
nitrogen source, ammonia is made at a high temperature and a high
pressure, and is provided to various systems needing ammonia of the
thermal power plant by the ammonia supply pipeline of the thermal
power plant.
[0047] The liquid ammonia enters the hearth of the boiler 107 to be
fuel and burnt in the hearth, partially replacing coal, which may
reduce the boiler coal amount and CO.sub.2 emission load. In
addition, the liquid ammonia leads to the ammonia spraying device
109, and is sprayed into the SCR working surface of a flue gas
cleaning denitration device, performing ammonia spraying process on
the SCR working surface.
[0048] In the present embodiment, the extra hydrogen and the
resultant oxygen in the electrolysis hydrogen making device 1 lead
to the multifuel burner 110 of the hearth of the boiler 107 for
supporting and stabilizing combustion. The oxygen realizes
oxygen-enriched combustion of the boiler.
[0049] The chemical water treatment workshop 8 of the thermal power
plant leads the treated chemical water to the purified water
preparation device 9. After the purified water preparation device 9
makes purified water, the make-up pump pumps the purified water to
the electrolysis hydrogen making device as raw water.
[0050] In the present embodiment, various gaseous products prepared
by the power plant are all used for the power plant system, without
external sales.
Third Embodiment
[0051] As shown in FIG. 3, the constitution of the present
embodiment is substantially the same as that in the first
embodiment, with the main difference in that in the present
embodiment, there is no space division device, all nitrogen may be
purchased directly externally, and the oxygen is generated from the
electrolysis hydrogen making device. Other constitutions and
functions as well as final products of the system are substantially
the same as those in the first embodiment.
[0052] According to the above-mentioned technical solution and
conception, persons skilled in the art make various changes and
alternations which should fall within the protection scope of the
claims of the present invention.
* * * * *