CN111718757A - Thermal power plant coal pyrolysis gas hydrogen production system and method - Google Patents
Thermal power plant coal pyrolysis gas hydrogen production system and method Download PDFInfo
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- CN111718757A CN111718757A CN201910209774.8A CN201910209774A CN111718757A CN 111718757 A CN111718757 A CN 111718757A CN 201910209774 A CN201910209774 A CN 201910209774A CN 111718757 A CN111718757 A CN 111718757A
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- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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- C10J3/50—Fuel charging devices
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- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
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- C10J2300/093—Coal
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- C10J2300/00—Details of gasification processes
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0956—Air or oxygen enriched air
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The invention discloses a system and a method for producing hydrogen from coal pyrolysis gas of a thermal power plant, which comprises a power station boiler (10), wherein the system for producing hydrogen from coal pyrolysis gas of the thermal power plant comprises coal pretreatment equipment, a gasification furnace (1) and a gas purification and separation device (8); the coal pretreatment equipment comprises at least one of coal water slurry processing equipment or a power station boiler pulverizing system (12); a feed inlet (14) is formed in the gasification furnace and is connected with coal pretreatment equipment; the coal product passing through the coal pretreatment equipment reacts with a gasification agent in a gasification furnace to generate mixed gas; one end of the gas purification and separation device (8) is connected with the gasification furnace, and the other end is connected with the power station boiler (10); the gas mixture is converted into hydrogen and waste gas in a gas purification and separation device (8), and the waste gas is conveyed to a power station boiler (10); the invention fully utilizes the equipment and materials of the thermal power plant, effectively utilizes energy, reduces the energy consumption of the gasification furnace and improves the hydrogen yield.
Description
Technical Field
The invention belongs to the field of hydrogen production by pyrolysis and gasification, in particular to a system and a method for producing hydrogen by pyrolyzing coal by using boiler flue gas and water vapor of a thermal power plant, and particularly provides a system and a method for producing hydrogen by pyrolyzing coal gas in the thermal power plant.
Background
Hydrogen is currently recognized as the cleanest fuel and also a very important chemical feedstock. Therefore, hydrogen will become a very important clean energy source in the 21 st century. At present, high attention is paid to the development of hydrogen production technology in all countries in the world. In general, hydrogen production techniques can be divided into two broad categories: (1) hydrogen is produced by water electrolysis; (2) the hydrogen is produced by converting other primary energy sources, mainly fossil energy sources (coal, petroleum and natural gas) are used as raw materials to be subjected to conversion reaction with water vapor at high temperature, carbon in the fossil energy is firstly changed into CO, and then the CO is converted into CO through CO conversion (namely water gas conversion) reaction2While, H2O is converted to hydrogen.
The conversion of hydrogen from other primary energy sources, such as pyrolysis gasification of coal and renewable energy fuels, is an important source of hydrogen in the future. The domestic patent 200710017691.6 invented a supercritical water fluidized bed reactor, and the domestic patent 201610570395.8 improved and invented a raffinate recycling coal supercritical water gasification hydrogen production device and method, but the supercritical water gasification device has high temperature and high pressure, and the device itself consumes a lot of energy.
How to reduce the energy consumption for preparing high-temperature water vapor and coal powder or coal water slurry in the hydrogen production process by pyrolysis and gasification becomes a problem to be solved urgently.
The invention is provided in view of the above.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for producing hydrogen from coal pyrolysis gas in a thermal power plant.
In order to realize the purpose, the invention adopts the following technical scheme:
a thermal power plant pyrolysis of coal gas hydrogen production system, it includes the power plant boiler, the said thermal power plant pyrolysis of coal gas hydrogen production system includes coal preconditioning plant, gasification furnace and gas purification and separation facility;
the coal pretreatment equipment comprises at least one of coal water slurry processing equipment or a power station boiler pulverizing system;
a feed port is arranged on the gasification furnace and is connected with coal pretreatment equipment; the coal product passing through the coal pretreatment equipment reacts with a gasification agent in a gasification furnace to generate mixed gas;
one end of the gas purification and separation device is connected with the gasification furnace, and the other end of the gas purification and separation device is connected with the power station boiler; the gas mixture is converted into hydrogen and waste gas in a gas purification and separation device, and the waste gas is conveyed to a power station boiler.
Preferably, the gasifying agent is at least one of air, oxygen, water vapor and high-temperature flue gas.
Preferably, the power station boiler is connected with a gasification furnace, and the high-temperature flue gas is from the high-temperature flue gas of the power station boiler.
Preferably, the system for preparing hydrogen from coal pyrolysis gas in the thermal power plant comprises a steam turbine, wherein the steam turbine is connected with the gasification furnace, and the steam comes from main steam or extracted steam of the steam turbine.
Preferably, the thermal power plant comprises an economizer, a reheater, an air preheater and a denitration device, and the gas purification and separation device purifies and separates the obtained exhaust gas and sends the exhaust gas back to the front side of one of the reheater, the economizer, the air preheater and the denitration device in the boiler flue according to the temperature of the exhaust gas.
Preferably, the thermal power plant pyrolysis coal gas hydrogen production system comprises a cooler, wherein the cooler is connected with a gasification furnace, a power station boiler and a steam turbine; the medium in the cooler is boiler water of a thermal power plant, the boiler water generates steam through the cooler, and the steam is conveyed to the steam turbine.
Preferably, the pyrolysis raw material coal powder directly comes from a coal mill and a coal pulverizing system of a thermal power plant; and/or the coal water slurry processing equipment is a low-speed coal mill of a power station of a thermal power plant.
Preferably, the hydrogen obtained by purification and separation of the gas purification and separation device is sent to a hydrogen storage tank or a hydrogen pipeline for external delivery, and is sold externally in the form of bottled gas, a prying tank truck or pipeline gas.
Preferably, the gasification furnace is provided with a catalyst adding port, and the catalyst is selected according to the type of the material fed into the gasification furnace.
The method for preparing the hydrogen from the coal pyrolysis gas of the thermal power plant uses the coal pyrolysis gas hydrogen preparation system of the thermal power plant, and is characterized in that: the method comprises the following steps:
s1: selecting the state of the coal raw material fed into the gasification furnace according to the existing equipment of the thermal power plant and the condition of a flue gas and steam thermodynamic system; if the coal powder is pulverized coal, S2 is executed; if the coal water slurry is the coal water slurry, S3 is executed;
s2: selecting a gasification process according to the type of coal processed by a coal mill of a thermal power plant and the granularity of pulverized coal; and determining the gasifying agent corresponding to the corresponding gasifying process; then, S4 is executed;
s3: selecting a gasification process according to the coal amount and the coal water slurry concentration processed by a low-speed coal mill of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process; then, S4 is executed;
s4: sending the pretreated coal raw material and a corresponding gasification agent into a corresponding gasification furnace, and carrying out coal gasification reaction to obtain mixed gas;
s5: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; and separating residual waste gas and sending the waste gas into a power station boiler.
Advantageous effects
(1) The high-temperature flue gas of the boiler of the thermal power plant is used as a gasifying agent, so that the waste heat of the flue gas is efficiently utilized, and the energy consumption of the gasification furnace is reduced.
(2) The high-temperature extracted steam of a steam turbine of a thermal power plant is used as a gasifying agent, the extracted steam waste heat and the steam working medium are efficiently utilized, the energy consumption of the gasification furnace is reduced, and the hydrogen yield is improved.
(3) Coal powder produced by a coal mill and a coal pulverizing system of a thermal power plant is directly utilized to carry out coal powder pyrolysis hydrogen production.
(4) Coal, additives, water and the like are mixed and processed in a coal mill to produce the coal water slurry by directly utilizing a low-speed steel ball coal mill of a thermal power plant.
(5) The waste gas separated by the gas purification and separation device is directly discharged into a boiler of a thermal power plant, and the pyrolysis gasification waste gas is treated by using a boiler flue gas treatment system, so that the waste gas treatment cost of the gasification furnace is reduced.
Drawings
FIG. 1 is a schematic diagram of a coal powder pyrolysis hydrogen production system of a thermal power plant according to an embodiment of the coal pyrolysis gas hydrogen production system of the thermal power plant;
FIG. 2 is a schematic diagram of a specific situation of a coal powder pyrolysis hydrogen production system of a thermal power plant according to an embodiment of the coal pyrolysis gas hydrogen production system of the thermal power plant;
FIG. 3 shows a coal pyrolysis hydrogen production method of a thermal power plant according to an embodiment of the coal pyrolysis gas hydrogen production system of the thermal power plant;
FIG. 4 is a schematic diagram of a coal water slurry pyrolysis hydrogen production system of a thermal power plant according to a second embodiment of the coal pyrolysis gas hydrogen production system of the thermal power plant;
FIG. 5 shows a coal water slurry pyrolysis hydrogen production method in a second embodiment of the coal pyrolysis gas hydrogen production system in a thermal power plant of the invention;
FIG. 6 is a schematic diagram of a coal pyrolysis gas hydrogen production system of a third thermal power plant according to an embodiment of the coal pyrolysis gas hydrogen production system of the thermal power plant;
FIG. 7 shows a third method for producing hydrogen from coal pyrolysis gas of a thermal power plant according to an embodiment of the system for producing hydrogen from coal pyrolysis gas of a thermal power plant of the invention;
FIG. 8 is a schematic diagram of a thermal coal gasification hydrogen production system of a thermal power plant according to an embodiment of the thermal coal gasification hydrogen production system of the thermal power plant;
fig. 9 shows a method for producing hydrogen from coal pyrolysis gas of a thermal power plant according to an embodiment of the system for producing hydrogen from coal pyrolysis gas of a thermal power plant.
Description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
The system comprises a gasification furnace 1, a cooler 2, a steam pocket 3, a superheater 4, a steam turbine 5, an economizer 6, a boiler flue 7, a gas purification and separation device 8, a power station boiler 10, a valve 11, a power station boiler pulverizing system 12, a power station low-speed coal mill 13, a feed inlet 14 and a slag discharge port 15.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the scope of the present invention as claimed is not limited to the scope described in the specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The core of the invention is to provide a system and a method for preparing hydrogen from coal pyrolysis gas in a thermal power plant, the system can realize low-energy-consumption hydrogen preparation from the coal pyrolysis gas, and the method comprises the steps of preparing hydrogen from the coal pyrolysis gas.
Example one
A thermal power plant pyrolysis of coal gas hydrogen production system, as shown in figure 1-figure 2, the thermal power plant pyrolysis of coal gas hydrogen production system includes a gasification furnace 1, the upper end of the gasification furnace 1 is provided with a feed inlet 14, the lower end is provided with a slag discharge port 15; 14 departments of feed inlet are connected with power boiler powder process system 12, power boiler powder process system 12 includes the coal pulverizer of thermal power plant and powder process system, produces the buggy through coal pulverizer of thermal power plant and powder process system. The power station boiler coal pulverizing system 12 conveys the prepared coal powder to the gasification furnace 1 through the feeding hole 14, and the residue generated by the gasification furnace 1 is discharged from the slag discharging hole 15. Coal feedstock preparation in the station boiler pulverizing system 12Namely, the coal pyrolysis gas hydrogen production system of the thermal power plant directly utilizes the coal powder produced by the coal mill and the powder making system of the thermal power plant to carry out coal powder pyrolysis hydrogen production, and can effectively utilize equipment and coal powder of the thermal power plant. Preferably, the pulverized coal produced by the power station boiler pulverizing system 12 is processed by nitrogen or CO2Is fed under pressure into the gasifier 1.
And a gasifying agent is introduced into the gasification furnace 1, and the gasifying agent and the coal powder react in the gasification furnace 1 to prepare mixed gas. Preferably, the gasifying agent is at least one of air, oxygen, water vapor and high-temperature flue gas.
Preferably, the air is preheated air.
Preferably, the gasification furnace 1 is connected with a steam turbine 5 of a thermal power plant, and the water vapor in the gasification agent is from main steam or extraction steam in the steam turbine 5. The high-temperature main steam or extracted steam of a steam turbine of a thermal power plant is used as a gasifying agent, the waste heat of the main steam or extracted steam and the steam working medium are efficiently utilized, the energy consumption of the gasification furnace is reduced, and the hydrogen production is improved.
Preferably, the high-temperature flue gas in the gasification agent is from high-temperature flue gas of a boiler of a thermal power plant. The high-temperature flue gas of the boiler of the thermal power plant is used as a gasifying agent, so that the waste heat of the flue gas is efficiently utilized, and the energy consumption of the gasification furnace is reduced.
Preferably, the gasification furnace 1 adopts an oxygen-enriched gasification technology, and oxygen-enriched gas is used as a gasification agent; oxygen-enriched gas is introduced into the gasification furnace 1, so that the gas production rate of the gasification furnace and the hydrogen production rate of mixed gas are improved.
Preferably, low-pressure low-temperature extraction steam from a steam turbine 5 of the thermal power plant is introduced into the high-temperature gas outlet area of the gasification furnace 1, and the low-temperature steam is used for chilling.
The thermal power plant coal pyrolysis gas hydrogen production system further comprises a power station boiler 10 and a gas purification and separation device 8, the gasification furnace 1 is connected with the power station boiler 10 and the gas purification and separation device 8, the gasification purification and separation device 8 is connected with the power station boiler 10, namely, the power station boiler 10, the gasification furnace 1 and the gasification purification and separation device 8 are sequentially connected end to form a circulating system. Part of high-temperature flue gas in the power station boiler 10 is conveyed to the gasification furnace 1 through a pipeline; a valve 11 is arranged between the utility boiler 10 and the gasification furnace 1, and the delivery quantity of the high-temperature flue gas delivered to the gasification furnace 1 from the utility boiler 10 can be effectively controlled by controlling the valve 11. The mixed gas generated in the gasification furnace 1 is conveyed to the gasification purification and separation device 8 through a pipeline, hydrogen is obtained through purification and separation of the gasification purification and separation device 8, and the rest of the waste gas is conveyed to the power station boiler 10, and the power station boiler 10 performs waste heat utilization.
Preferably, the hydrogen obtained by purification and separation by the gas purification and separation device 8 is sent to a hydrogen storage tank or a hydrogen pipeline for external delivery, and is sold externally in the form of bottled gas, a prying tank truck or pipeline gas.
The heat-engine plant is provided with a boiler flue 7 and comprises an economizer 6, a reheater, an air preheater and a denitration device.
Preferably, the gas purification and separation device 8 purifies and separates the obtained exhaust gas, and returns the purified and separated exhaust gas to the front side of one of the reheater, the economizer 6, the air preheater and the denitration device in the boiler flue 7 according to the temperature of the purified and separated exhaust gas, so as to treat or recycle the exhaust gas. The waste gas separated by the gas purification and separation device 8 is directly discharged into a boiler of a thermal power plant, and the waste gas of pyrolysis gasification is treated by using a boiler flue gas treatment system, so that the waste gas and flue gas treatment cost of a gasification furnace is reduced.
Preferably, as shown in fig. 2, the thermal power plant pyrolysis coal gas hydrogen production system comprises a cooler 2, wherein one end of the cooler 2 is connected with the gasification furnace 1, and the other end of the cooler 2 is connected with the power station boiler 10; the mixed gas generated in the gasification furnace 1 enters a cooler 2, and the medium in the cooler 2 is boiler water of a thermal power plant. In the cooler 2, the medium boiler water in the cooler 2 absorbs the heat of the mixed gas generated by the gasification furnace 1, so that the mixed gas generated by the gasification furnace 1 is cooled, and the boiler water absorbs the heat of the mixed gas to form steam, thereby effectively surplus heat and reducing heat loss.
The cooler 2 is connected with a steam drum 3, one end of the steam drum 3 is connected with the cooler 2, and the other end of the steam drum 3 is connected with a steam turbine 5; a superheater 4 is arranged between the steam drum 3 and the steam turbine 5. The medium in the cooler 2 is formed into steam by the heat of the mixed gas generated by the gasification furnace 1, and is formed into superheated steam after passing through the superheater 4, and the superheated steam is delivered to the steam turbine 5 to be used as a power source of the steam turbine 5. The cooler 2 can effectively recover waste heat to generate steam, and the steam is converged into a boiler drum or a steam-water circulation thermodynamic system of a power plant.
Preferably, the gasification furnace 1 is provided with a catalyst adding port, and the catalyst is selected according to the type of the material fed into the gasification furnace 1.
Preferably, the pulverized coal gasification method can adopt at least one of a fixed bed gasification method, a fluidized bed gasification method and an entrained flow gasification method to obtain the mixed gas.
A method for producing hydrogen from coal pyrolysis gas in a thermal power plant, as shown in fig. 3, comprising the following steps:
step 1: selecting a gasification process according to the type of coal and the granularity of pulverized coal of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process;
step 2: feeding coal powder and corresponding gasifying agent into a gasification furnace, and carrying out coal gasification reaction to obtain mixed gas;
the control system of the gasification furnace controls the amount of the coal powder sent into the gasification furnace and controls the flow and the temperature of the gasification agent sent into the gasification furnace, so that the gasification reaction energy balance equation of the gasification furnace is satisfied, and the stable gasification reaction temperature is realized.
And step 3: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; the remaining flue gas is separated and fed to the boiler flue 7.
Example two
The principle of this embodiment is the same as that of the first embodiment, and the main differences are as follows: the source of the gasified material is coal water slurry, not coal powder in the first embodiment.
As shown in fig. 4, the system for producing hydrogen from coal pyrolysis gas of a thermal power plant comprises a gasification furnace 1, wherein a feed inlet 14 is formed in the upper end of the gasification furnace 1, and a slag discharge outlet 15 is formed in the lower end of the gasification furnace; the feed port 14 is connected with a power station low-speed coal mill 13 of a thermal power plant, and coal, limestone, water and additives directly form coal water slurry after entering the power station low-speed coal mill 13; the power station low-speed coal mill 13 conveys the prepared coal water slurry to the gasification furnace 1 through a feed inlet 14, and residues generated by the gasification furnace 1 are discharged from a slag discharge port 15. And a gasifying agent is introduced into the gasification furnace 1, and the gasifying agent and the coal water slurry react in the gasification furnace 1 to prepare mixed gas. Coal raw materials are pretreated in a low-speed coal mill 13 of a power station, namely, the coal pyrolysis gas hydrogen production system of the thermal power plant directly utilizes a low-speed steel ball coal mill of the thermal power plant, coal, additives and water are mixed and processed in a coal mill to produce coal water slurry, and equipment and materials of the thermal power plant can be effectively utilized.
A method for producing hydrogen from coal pyrolysis gas in a thermal power plant, as shown in fig. 5, which comprises the following steps:
step 1: selecting a gasification process according to the coal amount and the coal water slurry concentration processed by a low-speed coal mill of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process;
step 2: feeding the coal water slurry and a corresponding gasifying agent into a gasification furnace, and carrying out coal gasification reaction to obtain mixed gas;
the gasification furnace control system controls the amount of the water-coal slurry sent into the gasification furnace and controls the flow and the temperature of the gasification agent sent into the gasification furnace so as to meet the gasification reaction energy balance equation of the gasification furnace and realize stable gasification reaction temperature.
And step 3: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; and the residual waste gas is separated and sent to a boiler flue.
EXAMPLE III
The principle of this embodiment is the same as that of the first embodiment, and the main differences are as follows: the gasified material sources are coal water slurry and coal powder, but the coal powder is only used in the first embodiment. Namely, in the embodiment, the first embodiment and the second embodiment are combined into a set of coal pyrolysis gas hydrogen production system of the thermal power plant.
As shown in fig. 6, the system for producing hydrogen from coal pyrolysis gas of a thermal power plant comprises a gasification furnace 1, wherein a feed inlet 14 is formed in the upper end of the gasification furnace 1, and a slag discharge outlet 15 is formed in the lower end of the gasification furnace. The gasification furnace 1 is connected with a boiler pulverizing system 12 and a low-speed coal mill 13 of a power station, and forms a coal pyrolysis gas hydrogen production system of a thermal power plant with a boiler 10 of the power plant. And a feed inlet 14 on the gasification furnace 1 is connected with a power station boiler pulverizing system 12 and a power station low-speed coal mill 13 of the thermal power plant.
The coal raw material is pretreated in a station boiler pulverizing system 12 and a low-speed coal mill 13 of a power station. Coal, limestone, water and additives directly form coal water slurry after entering a low-speed coal mill 13 of a power station; the coal water slurry prepared by the low-speed coal mill 13 of the power station and the coal powder prepared by the powder making system 12 of the power station boiler can be respectively conveyed to the corresponding gasification furnaces 1 through the feed inlets 14, and residues generated by the gasification furnaces 1 are discharged through the slag discharge openings 15. And a gasification agent is introduced into the gasification furnace 1, and the gasification agent and coal powder or coal water slurry react in the gasification furnace 1 to prepare mixed gas.
A method for producing hydrogen from coal pyrolysis gas in a thermal power plant, as shown in fig. 7, comprises the following steps:
step 1: selecting the state of the coal raw material fed into the gasification furnace according to the existing equipment of the thermal power plant and the condition of a flue gas and steam thermodynamic system; if the coal powder is pulverized coal, executing the step 2; if the coal water slurry is the coal water slurry, executing the step 3;
step 2: selecting a gasification process according to the type of coal processed by a coal mill of a thermal power plant and the granularity of pulverized coal; and determining the gasifying agent corresponding to the corresponding gasifying process; then executing the step 4;
and step 3: selecting a gasification process according to the coal amount and the coal water slurry concentration processed by a low-speed coal mill of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process; then executing the step 4;
and 4, step 4: sending the pretreated coal raw material and a corresponding gasification agent into a gasification furnace, and carrying out coal gasification reaction to obtain mixed gas;
the control system of the gasification furnace controls the amount of the coal raw material sent into the gasification furnace and controls the flow and the temperature of the gasification agent sent into the gasification furnace so as to meet the gasification reaction energy balance equation of the gasification furnace and realize stable gasification reaction temperature.
And 5: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; and the residual waste gas is separated and sent to a boiler flue.
Example four
The present embodiment is the same as the third embodiment in principle, and the main difference is: as shown in fig. 8, the system for producing hydrogen from coal pyrolysis gas in a thermal power plant includes two gasifiers 1.
The upper end of the gasification furnace 1 is provided with a feed inlet 14, and the lower end is provided with a slag discharge port 15. The two gasification furnaces 1 are respectively connected with a boiler pulverizing system 12 and a low-speed coal mill 13 of a power station, and are connected with a coal pyrolysis gas hydrogen production system of a power plant boiler 10 and a thermal power plant. A feed inlet 14 on one gasification furnace 1 is connected with a power station boiler pulverizing system 12 of a thermal power plant, and a feed inlet 14 on the other gasification furnace 1 is connected with a power station low-speed coal mill 13.
The coal raw material is pretreated in a station boiler pulverizing system 12 and a low-speed coal mill 13 of a power station. Coal, limestone, water and additives directly form coal water slurry after entering a low-speed coal mill 13 of a power station; the coal water slurry prepared by the low-speed coal mill 13 of the power station and the coal powder prepared by the powder preparation system 12 of the power station boiler can be respectively conveyed to the corresponding gasification furnaces 1 through the feeding ports 14 of the corresponding gasification furnaces, and residues generated by the gasification furnaces 1 are discharged through the slag discharging port 15. And a gasification agent is introduced into the gasification furnace 1, and the gasification agent and coal powder or coal water slurry react in the gasification furnace 1 to prepare mixed gas.
And introducing the mixed gas into a gas purification and separation device 8 to obtain hydrogen.
A method for producing hydrogen from coal pyrolysis gas in a thermal power plant, as shown in fig. 9, comprises the following steps:
step 1: selecting the state of the coal raw material fed into the gasification furnace according to the existing equipment of the thermal power plant and the condition of a flue gas and steam thermodynamic system; if the coal powder is pulverized coal, executing the step 2; if the coal water slurry is the coal water slurry, executing the step 3;
step 2: selecting a gasification process according to the type of coal processed by a coal mill of a thermal power plant and the granularity of pulverized coal; and determining the gasifying agent corresponding to the corresponding gasifying process; then executing the step 4;
and step 3: selecting a gasification process according to the coal amount and the coal water slurry concentration processed by a low-speed coal mill of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process; then executing the step 4;
and 4, step 4: sending the pretreated coal raw material and the corresponding gasification furnace into the corresponding gasification furnace;
the control system of the gasification furnace controls the amount of the coal raw material sent into the gasification furnace and controls the flow and the temperature of the gasification agent sent into the gasification furnace so as to meet the gasification reaction energy balance equation of the gasification furnace and realize stable gasification reaction temperature.
And 5: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; and the residual waste gas is separated and sent to a boiler flue.
The invention has the following advantages that (1) high-temperature flue gas of a boiler of a thermal power plant is used as a gasifying agent, the waste heat of the flue gas is efficiently utilized, and the energy consumption of the gasification furnace is reduced. (2) High-temperature extracted steam of a steam turbine of a thermal power plant is used as a gasifying agent, waste heat of extracted steam and a steam working medium are efficiently utilized, the energy consumption of the gasification furnace is reduced, and the hydrogen yield is improved. (3) Coal powder produced by a coal mill and a coal pulverizing system of a thermal power plant is directly utilized to carry out coal powder pyrolysis hydrogen production. (4) Coal, additive and water are mixed in a coal mill to produce the coal water slurry by directly utilizing a low-speed steel ball coal mill of a thermal power plant. (5) The waste gas separated by the gas purification and separation device is directly discharged into a boiler of a thermal power plant, and the pyrolysis gasification waste gas is treated by using a boiler flue gas treatment system, so that the waste gas treatment cost of the gasification furnace is reduced.
In the description of the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or through an intermediary profile. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "a specific embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application, and exemplary expressions for the terms above do not necessarily refer to the same embodiment or embodiment in the specification. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood by those skilled in the art that although the embodiments of the present invention have been described above, the embodiments are only used for understanding the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a thermal power plant pyrolysis of coal gas hydrogen manufacturing system, its includes power boiler (10), its characterized in that: the thermal power plant coal pyrolysis gas hydrogen production system comprises coal pretreatment equipment, a gasification furnace (1) and a gas purification and separation device (8);
wherein the coal pretreatment equipment comprises at least one of coal water slurry processing equipment or a power station boiler pulverizing system (12);
a feed inlet (14) is formed in the gasification furnace (1), and the feed inlet (14) is connected with coal pretreatment equipment; the coal product passing through the coal pretreatment equipment reacts with a gasifying agent in a gasification furnace (1) to generate mixed gas;
one end of the gas purification and separation device (8) is connected with the gasification furnace (1), and the other end is connected with the power station boiler (10); the gas mixture is converted in a gas purification and separation device (8) into hydrogen and exhaust gas, which is fed to a utility boiler (10).
2. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the gasifying agent is at least one of air, oxygen, water vapor and high-temperature flue gas.
3. The thermal power plant pyrolysis of coal gas hydrogen generation system of claim 2, characterized in that: the power station boiler (10) is connected with the gasification furnace (1), and the high-temperature flue gas comes from the high-temperature flue gas of the power station boiler (10).
4. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 2 or 3, characterized in that: the coal pyrolysis gas hydrogen production system of the thermal power plant comprises a steam turbine (5), wherein the steam turbine (5) is connected with the gasification furnace (1), and the steam comes from main steam or extracted steam of the steam turbine (5).
5. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the thermal power plant comprises an economizer (6), a reheater, an air preheater and a denitration device, wherein the gas purification and separation device (8) purifies and separates the obtained waste gas and sends the waste gas back to the front side of one of the reheater, the economizer (6), the air preheater and the denitration device in the boiler flue according to the temperature of the waste gas.
6. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the thermal power plant pyrolysis coal gas hydrogen production system comprises a cooler (2), wherein the cooler (2) is connected with a gasification furnace (1), a power station boiler (10) and a steam turbine (5); the medium in the cooler (2) is boiler water of a thermal power plant, the boiler water generates steam through the cooler (2), and the steam is conveyed to the steam turbine (5).
7. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the pyrolysis raw material coal powder directly comes from a coal mill and a coal pulverizing system of a thermal power plant; and/or the coal water slurry processing equipment is a low-speed coal mill (13) of a power station of a thermal power plant.
8. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the hydrogen obtained by purification and separation of the gas purification and separation device (8) is sent into a hydrogen storage tank or a hydrogen pipeline for external delivery, and is sold externally in the form of bottled gas, a prying tank car or pipeline gas.
9. The thermal power plant pyrolysis of coal gas hydrogen production system of claim 1, characterized in that: the gasification furnace (1) is provided with a catalyst adding port, and the catalyst is selected according to the type of the material fed into the gasification furnace (1).
10. A method for producing hydrogen from coal pyrolysis gas of a thermal power plant by using the system for producing hydrogen from coal pyrolysis gas of a thermal power plant according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
s1: selecting the state of the coal raw material fed into the gasification furnace according to the existing equipment of the thermal power plant and the condition of a flue gas and steam thermodynamic system; if the coal powder is pulverized coal, S2 is executed; if the coal water slurry is the coal water slurry, S3 is executed;
s2: selecting a gasification process according to the type of coal processed by a coal mill of a thermal power plant and the granularity of pulverized coal; and determining the gasifying agent corresponding to the corresponding gasifying process; then, S4 is executed;
s3: selecting a gasification process according to the coal amount and the coal water slurry concentration processed by a low-speed coal mill of a thermal power plant; and determining the gasifying agent corresponding to the corresponding gasifying process; then, S4 is executed;
s4: sending the pretreated coal raw material and a corresponding gasification agent into a corresponding gasification furnace, and carrying out coal gasification reaction to obtain mixed gas;
s5: sending the generated mixed gas into a gas purification and separation device for purification treatment; separating the purified gas to obtain hydrogen; the remaining exhaust gases are separated and fed to the utility boiler (10).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112831351A (en) * | 2020-12-30 | 2021-05-25 | 西安交通大学 | Method for in-situ resource utilization of high-temperature carbon dioxide of power plant |
| CN113583714A (en) * | 2021-07-30 | 2021-11-02 | 西安热工研究院有限公司 | Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112831351A (en) * | 2020-12-30 | 2021-05-25 | 西安交通大学 | Method for in-situ resource utilization of high-temperature carbon dioxide of power plant |
| CN113583714A (en) * | 2021-07-30 | 2021-11-02 | 西安热工研究院有限公司 | Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method |
| CN113583714B (en) * | 2021-07-30 | 2022-08-30 | 西安热工研究院有限公司 | Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method |
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