CN116731754A - Efficient coal-based raw material chemical-power poly-generation method and device - Google Patents

Efficient coal-based raw material chemical-power poly-generation method and device Download PDF

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CN116731754A
CN116731754A CN202310667035.XA CN202310667035A CN116731754A CN 116731754 A CN116731754 A CN 116731754A CN 202310667035 A CN202310667035 A CN 202310667035A CN 116731754 A CN116731754 A CN 116731754A
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gas
chemical
hydrogen
raw material
coal
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楼韧
楼寿林
许锦辉
王雨瑶
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Hangzhou Linda Chemical Technology Engineering Co ltd
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Hangzhou Linda Chemical Technology Engineering Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/02—Dust removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
    • C10K3/026—Increasing the carbon monoxide content, e.g. reverse water-gas shift [RWGS]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • 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
    • C10J2300/0969—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
    • C10J2300/1618—Modification of synthesis gas composition, e.g. to meet some criteria
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1656—Conversion of synthesis gas to chemicals
    • C10J2300/1665—Conversion of synthesis gas to chemicals to alcohols, e.g. methanol or ethanol
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity
    • C10J2300/1675—Integration of gasification processes with another plant or parts within the plant with the production of electricity making use of a steam turbine
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/1684—Integration of gasification processes with another plant or parts within the plant with electrolysis of water

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The application discloses a high-efficiency coal-based raw material chemical-power poly-generation method, which comprises the steps of synthesis gas preparation, purification, chemical synthesis, cogeneration, gas distribution and water electrolysis, wherein carbon-rich raw material coal is used as raw material, and multi-raw material gas can be added as mixed raw material gas according to the need, so that the air separation O preparation adopted in the prior art coal gasification poly-generation system is canceled 2 And water gas CO conversion hydrogen production, avoiding emission conversion to generate a large amount of CO 2 Realizing optimal reaction hydrogen-carbon ratio chemical production-power poly-generation. The application also discloses a high-efficiency coal-based raw material chemical-power poly-generation device suitable for the method, which comprises a synthesis gas preparation area, a purification area, a chemical synthesis area and a thermoelectric couplingA gas producing zone, a gas distributing zone and a water electrolysis zone.

Description

Efficient coal-based raw material chemical-power poly-generation method and device
Technical Field
The application relates to a plurality of fields of coal chemical industry, energy sources and environmental protection, which mainly comprises the steps of preparing high-CO synthetic gas from coal raw materials, or preparing the synthetic gas by steam conversion of the synthetic gas and natural gas or coke oven gas and converter gas, preparing various chemical products such as methanol, dimethyl ether, fischer-Tropsch reaction oil preparation, alkene, alkane, acetic acid and the like or the chemical-power and thermal energy CO-production by mixing the multi-gas source synthetic gas and hydrogen and adjusting the hydrogen-carbon ratio.
Background
CO 2 Is the major greenhouse gas emitted by the rise in temperature of the earth's environment that affects human survival. At present, china is the largest carbon emission country in the world, firstly, the coal chemical industry products in China comprise coal-made methanol, olefin, coal-made natural gas, coal-made oil and the like, the coal gasification is adopted to prepare synthetic gas, and then CO is converted into low-temperature methanol to wash and discharge a large amount of CO 2 Secondly, china is the largest coal-fired power generation country in the world, and a large amount of CO is discharged in coal-fired power generation 2 The method not only has serious influence on the ecological environment of China, but also has serious influence on the internationally-located image of China.
Several research and development units propose CO 2 Technical scheme for synthesizing methanol by hydrogenation, and CO is further improved for the scheme 2 Conversion of the synthesis is due to CO 2 The synthesis of methanol requires 50% H increase over the CO synthesis of methanol 2 The molecules bring about the increase of raw material consumption and manufacturing cost, and especially the domestic and foreign technology of preparing methanol from coal so far basically converts 60% of high CO in the coal gasification outlet synthetic gas into 30% of CO and converts the rest into CO 2 High coal consumption and CO of the product caused by the removal and emission 2 The discharge amount is large. For this reason, several research and development units propose to adopt carbon-rich coal gasification and hydrogen-rich natural gas conversion, and the double-gas-head gas production achieves the aim of less conversion, but is limited by the fact that more coal and less natural gas are produced in China, and currently, the current China greatly develops hydroelectric power, wind power, photovoltaic power generation, and electrolytic water to produce hydrogen instead of coal to produce hydrogen is to reduce CO 2 The effective emission method is questioned by partial experts due to higher hydrogen production electricity consumption and higher cost in the recent years.
In 2007, a main edition of China university of academy of sciences king published a book of development and development of China energy technology, 21 st century (Qinghai university Press, P164 FIG. 3-19), namely "schematic conceptual diagram of polygeneration System with coal gas as a core" (see FIG. 5 of the specification). In the prior art diagram, air separation is adopted to obtain the oxygen for coal gasification, and the main components are CO and H 2 CO conversion by steam of raw gasGeneration of H 2 And CO 2 Separation of CO-rich 2 The gas regulation accords with the hydrogen-carbon ratio of different chemical products and produces various chemical products liquid fuel oil or electricity generation, heat supply, cold supply, hydrogen production, fuel cell, since the last ten years of publication, a large number of papers about IGCC or GCC poly-generation have been published at home and abroad, wherein a large number of papers about IGCC or GCC poly-generation are subject from chemical industry-electricity or power co-generation, the combination mode is that chemical industry and electricity are connected in series, parallel and serial, the methanol, dimethyl ether, oil, chemical products and electricity are different in kinetic ratio change to influence the single-production-to-energy efficiency ratio, but various schemes calculate the obtained effective efficiencyThe efficiency LHV varies less greatly, with overall efficiency of up to 50% or less.
Disclosure of Invention
The application provides a high-efficiency coal-based raw material chemical-power poly-generation method, which takes the coal-rich raw material coal gas as the main raw material, and CO is gasified at high temperature 2 Converts into CO, and fully utilizes hydrogen in the gas to realize energy conservation and emission reduction.
A high-efficiency coal-based raw material chemical-power poly-generation method comprises the steps of synthesis gas preparation, purification, chemical synthesis and cogeneration, and also comprises gas distribution and water electrolysis, wherein carbon-rich raw material coal is used as raw material, and multi-raw material gas can be added as mixed raw material gas according to the requirement, so that the air separation O preparation adopted in the prior art coal gasification poly-generation system is eliminated 2 And water gas CO conversion hydrogen production, avoiding emission conversion to generate a large amount of CO 2 Realize the optimal reaction hydrogen-carbon ratio chemical production-power poly-generation, comprising the following steps:
(1) Gasification of the synthesis gas production zone: o for the carbon-rich raw material 2 And CO 2 Or O 2 And CO 2 And gasifying the high-temperature steam, wherein O is 2 From electrolyzed water, said CO 2 For coming from the thermoelectric generation area, the carbon-rich raw material is gasified in the synthesis gas area at the high temperature of 800-1800 ℃ to prepare the catalyst containing mol fraction>70% CO and H 2 Is a raw gas of (1);
(2) Purifying, desulfurizing, dedusting and detoxifying in the purifying area: removing dust, desulfurizing and detoxication from the crude gas to remove substances toxic and harmful to chemical catalysts and power generation equipment to obtain clean gas;
(3) Water electrolysis in the water electrolysis area for hydrogen production: electrolyzing water in a water electrolysis area to prepare oxygen and hydrogen, wherein the hydrogen is used for chemical synthesis, the oxygen is used for coal gasification and gas power generation, and the electricity is used for the water electrolysis area; when the external photovoltaic wind power new energy is used for generating or storing electricity, the generated electricity can be sold;
(4) Gas distribution in gas distribution area: the clean gas is divided into chemical gas I and power generation gas I, when the raw material gas is coal gas of a single raw material, the power generation gas I is separated and extracted to obtain H by a membrane separation or a PSA method or a combination of the membrane separation and the PSA method 2 The chemical gas I is supplemented into the rotary flow to form chemical gas II, the generated gas II is called the generated gas II to be sent to gas steam power generation after hydrogen is extracted, and hydrogen and oxygen are prepared by supplying power to water, if the hydrogen-carbon ratio value in the chemical gas II isIf the optimal value f1 is not reached, hydrogen-carbon ratio is adjusted to the optimal value f1 according to different chemical products by using hydrogen produced by electrolysis of water to form synthesis gas, and if the hydrogen-carbon value in the chemical gas II reaches the optimal value f1, the chemical gas II is directly used as synthesis gas for chemical synthesis;
when the raw material gas is a mixed gas of single raw material gas and multiple raw material gases, if the hydrogen-carbon ratio of the mixed gas reaches an optimized value f1, the generated electricity I is directly sent to gas steam for generating electricity without hydrogen extraction, and the chemical gas I is used as synthesis gas for chemical synthesis; if the hydrogen-carbon ratio of the mixed gas does not reach the optimized value f1, the power generation gas I is separated and extracted into H by using a membrane separation method or a PSA method or a combination of the membrane separation method and the PSA method 2 The diversion is supplemented into the chemical gas I to form chemical gas II, and then whether H from electrolyzed water is added or not is selected according to whether the hydrogen-carbon ratio value of the chemical gas II reaches an optimal value 2 The method comprises the steps of carrying out a first treatment on the surface of the The generated gas I is called generated gas II to send to gas steam to generate electricity after hydrogen is extracted, and hydrogen and oxygen are prepared by supplying power to water;
the optimized value f1 of the hydrogen-carbon ratio is 0.96-1.08 times of the theoretical hydrogen-carbon ratio f of the chemical product;
(5) Chemical synthesis in synthesis area: the synthesis gas reaching the optimized hydrogen-carbon ratio from the gas distribution area is compressed by a compressor to increase the pressure to the corresponding product reaction pressure and heated by the hot gas from the reactor to the active temperature of the catalyst of the selected product, and enters the reactor with a heat exchange tube in the catalyst bed for reaction, the byproduct steam is used for heat exchange to reach the catalytic reaction temperature controlled and regulated, the chemical reactor is completed by the temperature of the catalyst bed temperature difference of less than 20 ℃, the heat is recovered by heat exchange and cooling, the heat is fed into a gas-liquid separator, the separated liquid product is decompressed by an expander, the recovered energy is rectified by the product to the product standard requirement, and the chemical synthesis is sent out;
(6) Gas power generation and steam power generation in the cogeneration area: the power generation gas I or the power generation gas II firstly generates power through fuel gas, high-temperature gas at the outlet of the fuel gas machine exchanges heat through a boiler tube to generate steam, the steam for recovering heat from front to back of the centralized system is used for steam power generation through a steam turbine, the power generated by the thermoelectric power generation region is used for preparing oxygen and hydrogen through electrolysis of water, and the power consumption for water electrolysis can be self-generated power of the system or external new energy power supply, namely wind power or solar photovoltaic power generation.
When the carbon-rich raw material is single raw material, it means coal, coke, asphalt and heavy oil, and the synthetic gas preparation is coal gasification, pyrolysis and coking, and when the described chemical product is methyl alcohol, it can not adopt original monograph to propose IGCC and make it use of slurry bed reaction, and all the raw material coal uses O 2 And CO 2 Purifying, distributing gas to chemical synthesis after high temperature gasification at 1700 deg.c, water cooling around pipe with high heat exchange performance in gas-solid phase methanol synthesis reactor with pressure of 5-10 MPa and optimized hydrogen-carbon ratio f1=1.95-2.08, and circulation ratio r<2 low recycle ratio feed gas, hydrogen to carbon ratioThe method can be reduced from the existing f=2.1-2.15 to the optimized value f1=1.95-2.08, and the methanol discharged from the tower can be multiplied by 12% from the existing 3-6%. CO emission in poly-generation system gas power generation 2 More CO than coal gasifier needs to be added 2 During the process, hydrogen can be added into the purge gas after the methanol product is separated by chemical synthesis to boost the pressure, so as to add more CO 2 CO is carried out 2 Hydrogenation to methanol for consumptionCO 2 Achieving the CO of the poly-generation system 2 Zero emission. The prior literature and methanol device select fresh gas hydrogen-carbon ratio f=2.05-2.1, so that on one hand, the reaction starts to be close to the theoretical consumption value 2, but then the hydrogen-carbon ratio moves to the middle section and the outlet along with the reaction, and the mol percentage value of hydrogen is higher>70%, the deviation from the optimal reaction value also increases the amount of the recovered hydrogen treatment gas and increases the energy consumption.
The multi-raw gas can adopt coal and purified natural gas conversion gas, coke oven gas conversion gas or steel mill blast furnace conversion gas, calcium carbide plant phosphoric acid plant gas or biomass gas to be purified to form CO and H according to project enterprises, regional resource raw material conditions and prices 2 The main purified mixed gas is used for adjusting the hydrogen quantity to the optimized value of the hydrogen-carbon ratio f of the corresponding chemical product to manufacture the poly-generation product.
The range of the hydrogen-carbon ratio optimized value f1 is 0.975-1.04 times of the theoretical hydrogen-carbon ratio f of the chemical product.
Taking methanol synthesis as an example, CO and CO are synthesized from methanol 2 The feed gas was consumed according to the following reactions:
CO+2H 2 ＝CH 3 OH
CO 2 +3H 2 ＝CH 3 OH+H 2 O
wherein the synthesis rate of CO can reach approximately 100%, CO 2 The synthesis rate is much smaller than that of CO, so that the hydrogen-carbon ratio of the raw material gas for synthesizing methanol is higherThe method is characterized in that f=2 is close to the actual hydrogen-carbon ratio consumed by the methanol synthesis reaction, and when an ICI cooling shock tower or a radial methanol tower is industrially used, the methanol synthesis strong exothermic reaction is used, so that the overheating deactivation of the copper-based methanol catalyst caused by the overheat and overheat is prevented, and the methanol raw material gas f is 2.1-2.15 or 2.0-2.2, so that H in the methanol synthesis is realized 2 The consumption of raw material gas is increased, so that a water-cooling heat exchange reactor with strong heat exchange capability can be adopted, and chemical synthesis is performed by selecting and optimizing the f1 value of the raw material gas according to 0.975-1.04 times of the f value of the chemical reaction theory hydrogen-carbon ratio, namely f1=1.95-2.08, so as to achieve the purpose of reducing the raw material unit consumption, wherein the f1 value is called as the optimized value of the chemical synthesis hydrogen-carbon ratio.
As a preferable mode, high-temperature coal gasification, medium-temperature chemical synthesis and low-temperature product gas-liquid separation energy optimization cascade utilization can be adopted, low-temperature gas material flow can be expanded by a pressurizing turbine to recover energy, medium-temperature medium-pressure steam with the pressure of more than 2MPa produced by chemical synthesis can be increased to high-temperature high-pressure supercritical steam power generation by a coal gasification waste heat boiler, or a blower, a compressor, a pressurizing circulator, a water pump and a chemical product liquid delivery pump used in the system can be matched with different coaxial expanders, steam turbines and generators according to corresponding temperature, pressure and flow parameters, so that the traditional pressure reducing valve interception expansion is replaced to improve energy efficiency, save energy and reduce consumption.
In the synthesis gas producing zone>Recovering heat by-product high temperature steam at 1000 ℃ by Wen Huzha, or using heat of high temperature slag for heating CO of a binary synthesis gas zone 2 And the energy utilization rate of the system is improved.
For different chemical products, advanced process control software APC special for technology is selected, and the hydrogen amount added to a gas distribution area is automatically regulated according to the chemical gas II, the hydrogen-carbon ratio at the inlet and outlet of the reactor and the product synthesis rate detection result, so that the deviation of the hydrogen-carbon ratio is timely and accurately regulated, and the optimal value is maintained to achieve high efficiency, energy conservation and consumption reduction.
Products of the chemical synthesis zone include, but are not limited to, one or more of methanol, ethanol, dimethyl ether, fischer-Tropsch synthetic oil, alkene, alkane, methanation, acetic acid, acetate and hydrogen energy, and electricity generated by the cogeneration zone can be continuously supplied for electrolytic hydrogen production and can also be used for fuel cells and various electric storage batteries.
The existing chemical reactor has a plurality of overtemperature phenomena, for example, the catalyst is deactivated by overheat caused by methanol synthesis gas at the temperature of more than 300 ℃, and the chemical synthesis reaction temperature including the later period is optimized to 220-280 ℃, so that the catalyst activity is maintained, and the overheat deactivation is avoided.
The hydrogen extracted from the power generation gas I in the purified coal gas is fed into the chemical synthesis gas, so that the requirement of optimizing the hydrogen-carbon ratio in the chemical reaction is met, the heat value of the specific hydrogen in the power generation gas is improved, and the energy efficiency of the system is improved by CO.
The fuel gas power generation can use pure oxygen or oxygen-enriched air as a combustion agent instead of air.
The electricity used for producing hydrogen by electrolyzing water comes from a thermoelectric power generation area, hydrogen is produced by using fuel gas and steam, green electricity can be used as external new energy, the carbon emission of fuel gas power generation is reduced, the power supply complement system for external wind, water power, solar energy photovoltaic and photo-thermal new energy is used for generating electricity, and the solar energy power generation can be used for storing electricity by using molten salt to supply electricity for producing hydrogen by electrolyzing water without sunshine at night.
As a preferable mode, the national binary electricity price can be used for setting a hydrogen storage device, the night multipurpose valley electricity is low in price, the electricity is used for preparing hydrogen in a plurality of modes, and the night hydrogen storage is used for supplying chemical synthesis gas hydrogen in the daytime so as to reduce the cost.
The utility model provides a high-efficient coal-based raw materials chemical industry-power polygeneration plant, includes system synthetic gas district, purification zone, chemical industry synthetic district and cogeneration district, still includes gas distribution district and water electrolysis district, system synthetic gas district include gasifier, waste heat boiler, purification zone including electric dust collecting equipment, the desulfurization equipment that connects gradually, gas distribution district include membrane separator, blender, chemical industry synthetic district include synthetic reactor, heat exchanger, water-cooler, gas-liquid separator, the cogeneration district include steam turbine, gas turbine, water electrolysis district include water electrolyzer, the deaerator that connects gradually, gasifier and waste heat boiler external steam turbine, waste heat boiler back and electric dust collecting equipment, desulfurization equipment connect gradually, the pipeline of play the desulfurization equipment divide two parts, be connected with gas holder and membrane separator respectively, membrane separator and heat exchanger, synthetic reactor, water-cooler connect gradually.
Preferably, the device also comprises a safety gas holder, a hydrogen holder, an inlet and outlet pipeline with a regulating valve connected with the safety gas holder, a device for detecting temperature, pressure and various parameters in real time, and multi-parameter, multi-target digital, intelligent and optimized control equipment. Firstly, the device is used for storing gas during start-up and shutdown and accident overhaul, and secondly, the device reduces the air discharge amount of a safe torch during normal production, saves air amount and improves the air environment of a factory production area.
The application can be used for the reconstruction of established engineering, and retains coal gasificationAnd chemical production blocks, removing gas CO conversion and low-temperature methanol eluting CO 2 The device and the air separation oxygen-making coal gasification device are additionally provided or modified with a coal gas purification and gas-steam combined power generation device and a power generation coal gas hydrogen extraction and water electrolysis hydrogen production device.
The application is based on the coal, oil and gas lack resources in China, and has high energy consumption and CO in thermal power plants and coal petrochemical industry 2 The emission and amplification are carried out according to the current coal petrochemical energy situation, technical level and market situation of China, and the feasible optimization technology is provided, so that the energy efficiency is improved, the raw material cost is reduced, the economic benefit is improved, the raw materials mainly rich in carbon are selected in the actual multi-raw materials, the multi-product co-production variety selection theory is based on the national relevant policy, the change of different areas, environmental conditions and markets in different periods of each unit is determined, and the method is not limited by the text, for example, the coal can be gasified and coked in a grading manner besides gasification. The uniform temperature type high-efficiency energy-saving safe winding pipe reactor which is developed and successfully applied to a plurality of chemical production fields by the applicant is naturally preferred equipment, the novel technology, the novel equipment and the novel product which are developed and authorized before can be actively implemented in proper conditions, and the patent rights can be fully respected for good technologies of the same person or electric power technologies related to other professions in projects, so that the positive cooperation win-win is achieved.
In the application of the chemical-power poly-generation, the technical conditions of each process are in accordance with the standards published by the national departments in the process of coal gasification, purification, chemical synthesis, gas and steam power generation and electrolyzed water hydrogen production, and the equipment is optimized according to the conditions of each specific implementation project.
The application has the following beneficial effects:
1. solves the problems of the prior IGCC coal gasification chemical industry-power co-production efficiency that the coal consumption of unit products is high and the economic efficiency is not good, considers IGCC poly-production to be a good way for solving the world resource energy environment in developed countries in the world for many years, and has been advocated by China, so that a plurality of scientific research departments and chemical engineering work are closely cooperated to obtain a plurality of achievements, a lot of experiences are accumulated, and single poly-production technology, such as coal gasification large-scale coal chemical industry, including methanol synthesis, methanol ethylene production, propylene production,MTO, MTP, coal Fischer-Tropsch synthesis and coal power generation achieve great results, but regarding the technical route of coal chemical industry, high-temperature coal gasification oxygen is basically adopted, air separation is still adopted to prepare oxygen, the investment of air separation and coal gasification devices in the coal chemical industry device is more than 50% of the investment of the total device, and 2/3CO in the coal-to-CO-rich gas is converted by water vapor for water gas CO to be discharged to generate CO 2 Not only increases the coal consumption, but also discharges a large amount of greenhouse gases. Aiming at the problems, the technology adopts the principle of waste disposal, firstly, CO is discharged from production 2 For reaction with carbon in high-temperature coal gasification to produce CO, i.e. C+CO 2 =2co, exhaust gas CO 2 Become a raw material of chemical products, and reduce the consumption of raw coal; secondly, CO-rich gas power generation and H production by water electrolysis 2 ，H 2 O＝H 2 +1/2O 2 ，H 2 For chemical product raw materials, O 2 The method is used for coal gasification, the investment of an air separation device is canceled, chemical products and coal gasification raw materials are provided, and hydrogen production raw materials by natural gas and oil conversion are replaced; the cost of the chemical product is reduced by gas power generation or new energy power generation, the chemical product is prepared based on single raw material coal raw materials, a hydrogen-rich raw material double-gas head method such as natural gas conversion is adopted, due to different technological conditions of coal gasification and natural gas conversion, the matching problem of the two needs to be solved, the natural gas is insufficient in China, the hydrogen-carbon ratio f is difficult to completely optimize for the reaction of the chemical product, the hydrogen extraction cost in the useful power generation synthesis gas is low, but the hydrogen extraction amount can meet the optimized hydrogen-carbon ratio, the design requirement is met, hydrogen is produced only by electrolytic water, the hydrogen distribution amount is not high, the hydrogen distribution amount can be randomly adjusted according to the hydrogen-carbon ratio.
2. For areas and units with rich coal resources, only coal raw materials are gasified to generate carbon-rich coal gas with high CO content, the purified gas which is subjected to desulfurization, purification and removal of toxic substances to catalytic reaction is divided into chemical gas and power generation, hydrogen in the power generation is extracted by a membrane separation hydrogen extraction method to adjust the hydrogen-carbon ratio of the chemical gas to the optimal ratio of the chemical reaction to be produced, and the chemical gas is subjected to chemical reaction by a reactor catalyst to prepare various hydrocarbon chemical products such as methanol, dimethyl ether, fischer-Tropsch synthetic oil and olefin. Reactor outletThe unreacted gas is partially removed from the gas and steam to combine power generation and gasification and purification synthesis process, a heat exchange boiler produces steam to generate power, the electric power electrolysis water for generating the gas-steam power of the coal-made synthetic gas is used for preparing oxygen and hydrogen, the hydrogen is mixed with purified carbon-rich gas before being sent to the synthesis reaction process to prepare chemical products according to the hydrogen-carbon ratio required by the reaction of the synthetic products, the oxygen is used for coal gasification, and the CO is generated by the gas power generation 2 The coal gasification furnace is also used as oxidant consumption together with water vapor, and can not depend on external wind, light and hydroelectric power generation, thereby solving the problems of fluctuation and electricity storage of the day and night variation of wind and light power generation in the whole time period.
3. Based on the fact that the coal gas and the oil in the energy source of China are rich in coal, lack of oil and less in gas, even if the ratio of CO-rich gas to hydrogen and carbon in the coal gas produced by the existing high-temperature coal gasification is less than 0.5, the conversion of CO content is not less than 60%, the hydrogen production cost is the lowest by using coal, and the method has better economy.
4. Based on the centralized emission source in China in the flue gas emission of coal chemical industry and coal-fired plant, the method can adopt coal chemical industry-electric power poly-generation to fundamentally solve the problem of avoiding products such as methanol made from coal, synthetic natural gas by methanation, fischer-Tropsch synthetic oil olefin, synthetic ammonia and the like, and the raw gas discharged from the gasification furnace is high-carbon and low-hydrogen, and the water vapor of 60% CO gas is converted into CO through CO 2 And H 2 Eluting 30% of the CO-effective synthesis gas into CO by using low-temperature methanol 2 The emission not only increases the coal consumption, but also greatly increases the CO 2 And (5) discharging.
5. Compared with the prior art, the application provides new energy, namely solar photovoltaic and wind power are used for producing hydrogen, namely green hydrogen and CO 2 For the purpose of synthesizing methanol, the method is based on the current practical development of taking coal as a main raw material, reducing CO2 and C under the condition of high-temperature coal gasification to generate CO, and synthesizing methanol by hydrogenation with one less H 2 Greatly reduces the production cost and preferentially adopts a feasible industrialization road with the safe, economical and low-carbon three elements.
Drawings
FIG. 1 is a schematic flow chart of the process of the application.
FIG. 2 is a schematic view of the apparatus of the present application.
FIG. 3 is a schematic flow diagram of a method of the present application employing a partial internal power scheme in example 1.
FIG. 4 is a schematic flow diagram of the process of example 2 of the present application employing an externally powered, membrane-separated hydrogen scheme.
FIG. 5 is a conceptual diagram of a gas-based polygeneration system in the background of the application, which is written in the "development and development of energy technology in China, 21 st century".
Reference numerals illustrate:
1-gasification furnace 2-dust remover 3-waste heat boiler 4-electric dust remover
5-desulfurization equipment 6-gas storage tank 7-hydrogen supercharger 8-membrane separator
9-gas turbine 10-cogeneration zone steam turbine 11-cogeneration zone heat exchanger 12-synthesis gas zone steam turbine
13-synthesis reactor 14-heat exchanger 15-boiler water preheater 16-water cooler
17-gas-liquid separator 18-steam drum 19-synthetic compressor 20-expander
21-Water electrolyzer 22-deaerator 23-flume
Examples
The following example is in comparison to a conventional coal-to-methanol technology, which inputs 1160.8MW of coal and water vapor and O from air separation 2 Gasifying, cooling the synthesis gas at gasifying outlet, and converting to regulate hydrogen-carbon ratio to H 2 30mol％、CO 61mol％、CO 2 3mol%, f=0.42 to H 2 68.3mol％、CO 27.3mol％、CO 2 4mol%, f=2.05 (see Tang Hongqing, new technology of modern coal chemical industry, chemical industry press, 9 months in 2009, pages 86-86), and then methanol synthesis is performed to output methanol, wherein the lower heating value LHV565.8MW is calculated according to 80 ten thousand tons/year. Space division consumes 32.5MW. The system of this scheme discharges 189t/h of carbon dioxide, and the total energy efficiency is 47.4%.
Example 1
As shown in fig. 3, the same methanol annual production of 80 ten thousand tons is taken as an example, and a partial external power supply scheme is adopted. 422.1MW of input coal and CO from the System off gas 2 And O from electrolyzed water 2 Performing gasAnd (3) performing heat exchange on the high-temperature synthesis gas at the gasification outlet to generate superheated steam. The cooled synthesis gas is divided into two streams, wherein one stream of chemical gas and H generated by electrolysis water 2 Mixing the raw materials into methanol for synthesis, reacting the mixture with NC306 or XNC-98 catalyst at the pressure of 8.5MPa and the temperature of 220-270 ℃ to synthesize methanol, outputting equivalent methanol 565.8MW and producing byproduct steam, or heating the methanol synthesized 220 ℃ and 2.5MPa medium pressure steam into a gasification waste kettle to generate power by steam in a supercritical steam zone at 600 ℃; and the other one of the advanced gas turbine is used for gas power generation, the steam generated by heat exchange of the high-temperature gas at the outlet and the steam generated by the gasification and methanol synthesis working section enter the gas turbine for steam power generation together, and the total power generation is 135MW. However, the electrolysis water consumes 606MW and generates H 2 Completely supplementing synthesis gas to synthesize methanol, O 2 De-gasification and gas power generation, in addition, requires external power supply 471MW. CO generated by the fuel gas power generation 2 All in gasification consumption, zero carbon emission of the system, total energy efficiency 63.3%, 15.9% higher than the traditional example and no CO 2 And (5) discharging.
Example 2
As shown in fig. 4, a part of external power supply is adopted, and the power generation unit I adopts the scheme that hydrogen is separated by a membrane before the gas removal power generation in fig. 1. The input coal was 422.1MW and CO from the tail gas of the system as in example 1 2 And O from electrolyzed water 2 Gasifying, and generating superheated steam by heat exchange of high-temperature synthesis gas at the gasifying outlet. The cooled synthesis gas is divided into two parts, wherein one part is subjected to membrane separation to supplement hydrogen to the other part to remove the methanol synthesis gas, the rest gas enters a gas turbine for gas power generation, the steam generated by heat exchange of high-temperature gas at an outlet and the steam generated by a methanol synthesis working section enter the gas turbine for steam power generation together, the total power generation is 126MW, and if the medium-temperature medium-pressure steam generated by the methanol synthesis is heated to 600 ℃ to generate supercritical high-pressure steam for power generation, the generated energy is higher; separating hydrogen and H generated by electrolyzed water from another gasified gas by using a membrane 2 Mixing into methanol to synthesize, outputting 565.8MW methanol and by-producing steam. The power consumption of the electrolyzed water is 576MW, and the generated H 2 Completely supplementing synthesis gas to synthesize methanol, O 2 De-gasification and gas-fired power generation, in addition, require an external power supply of 450MW. CO generated by the fuel gas power generation 2 Is also totally consumed in gasificationThe system has zero carbon emission, the total energy efficiency is improved to 64.9%, and the total energy efficiency is 1.6% higher than that of the embodiment 1. When the external power is supplied, 450MW of hydrogen is produced by water electrolysis by external power supply.
In the above examples 1 and 2, the methanol is synthesized by using coal gas, the methanol yield is 80 ten thousand tons of refined methanol per year as compared with the comparative example, the consumption of coal in the examples 1 and 2 is 57.4T/h, the total consumption of coal is LHV422.1MJ, the consumption of 1 ton of methanol is less, only 574kg, the consumption of electricity for adding hydrogen is 471MW and 450MW respectively, the total energy efficiency is higher than 60%, and compared with the traditional process of CO conversion and low-temperature methanol elution of the same methanol yield, the total energy efficiency is higher than 60%, the total energy efficiency is lower than the total energy consumption of the coal is lower than that of the coal 2 The same annual production of 80 ten thousand tons of methanol consumes 157.8T/h, LHV= 1160.8MJ, 1.578 tons of coal consumed per ton of alcohol, overall energy efficiency is 47.4%, 10% more lower than that of example 1 and example 2, and CO is discharged for 1 hour 2 189 tons, 1 ton of methanol is discharged nearly 2 tons of CO 2 。
Chemical-dynamic different methods for coal-based raw materials with attached surfacesLHV efficiency comparison table
The photovoltaic wind power biomass new energy power generation, the new energy power generation policy and other subsidies and technical progress are greatly developed in the current China and abroad, and when the new poly-generation is used for supplying new energy externally, the new poly-generation can be used for preparing H2 and O2 by using new energy electrolyzed water, and the electricity can be generated automatically and respectively at 135MW and 126 MW.
Example 3
The high-efficiency coal-based raw material chemical-power poly-generation device shown in fig. 2 comprises a synthesis gas preparation area, a purification area, a chemical synthesis area and a heat and power co-generation area, and further comprises a gas distribution area and a water and power co-generation area, wherein the synthesis gas preparation area comprises a gasification furnace 1, a dust remover 2, a waste heat boiler 3 and a gasification steam removal turbine 12, the purification area comprises an electric dust collector 4 and a desulfurization device 5 which are sequentially connected, the gas distribution area comprises a membrane separator 8 and a hydrogen booster 7, the chemical synthesis area comprises a synthesis reactor 13, a heat exchanger 14, a boiler water preheater 15, a water cooler 16, a gas-liquid separator 17 and an expander 20, the heat and power co-generation area comprises a steam turbine 10, a gas turbine 9 and a heat and power co-generation area heat exchanger 11, the water and power co-generation area comprises a water electrolyzer 21, a deaerator 22 and a water tank 23 which are sequentially connected, the gasification furnace 1, the dust remover 2 and the waste heat boiler 3 are sequentially connected, superheated steam from the gasification furnace 2 and the boiler 3 is respectively connected with the synthesis gas generator 12 through pipelines, the waste heat separator 4 is connected with the heat and the heat exchanger 3, the heat exchanger 6, the heat exchanger is sequentially connected with the membrane separator 8, the heat and the heat exchanger 8, the heat exchanger is connected with the heat and the heat exchanger 9, the heat exchanger 9 and the heat exchanger 11, and the heat exchanger 9 are sequentially connected with the heat and the heat exchanger 8.
Carbon-rich coal-based feedstock and O from water electrolyzer 21 2 The mixed gas is sequentially sent to a gasification furnace 1, a dust remover 2, a waste heat boiler 3, an electric dust remover 4 and desulfurization equipment 5 to obtain clean gas, the clean gas is divided into chemical gas I and power generation I, the power generation I is sent to a membrane separator 8 and then is sent to a gas turbine 9 as power generation II after hydrogen is extracted, the chemical gas I is added into a gas storage tank 6 and then is used as chemical gas II to be mixed with hydrogen from the membrane separator 8 and a hydrogen booster 7, the chemical gas I is sent to a synthesis compressor 19 to be mixed with recycle gas from a gas-liquid separator 17, the mixture is preheated by a heat exchanger 14 and then enters a synthesis reactor 13 to synthesize chemical products, a steam drum 18 is arranged outside the synthesis reactor 13, the reaction gas from the synthesis reactor 13 is cooled by the heat exchanger 14, a boiler water preheater 15 and a water cooler 16, methanol products are separated by the gas-liquid separator 17, one part of the gas-liquid separator 17 is used as a purge gas to be decompressed by a expander 20, and the other part of the gas is used as recycle gas to be taken as the synthesis compressor 19. The hydrogen generated in the water electrolyzer 21 is sent to a gas distribution area and is distributed with chemical gas I to obtainThe synthesis gas meeting the optimized value of the hydrogen-carbon ratio and the oxygen are sent to a synthesis gas preparation area to participate in coal gasification.

Claims (10)

1. The utility model provides a high-efficient coal-based raw materials chemical industry-power polygeneration method, includes making synthetic gas, purification, chemical industry synthesis and cogeneration, its characterized in that: the method also comprises gas distribution and water electrolysis, takes carbon-rich raw material coal as raw material, and can also add multi-raw material gas as mixed raw material gas according to the requirement, so as to cancel the air separation O adopted in the prior art coal gasification poly-generation system 2 And water gas CO shift to produce hydrogen, thereby generating a large amount of CO through emission shift 2 Realize the optimal reaction hydrogen-carbon ratio chemical production-power poly-generation, comprising the following steps:
(1) Gasification of the synthesis gas production zone: o for the carbon-rich raw material 2 And CO 2 Or O 2 And CO 2 And gasifying the high-temperature steam, wherein O is 2 From electrolyzed water, said CO 2 For coming from the thermoelectric generation area, the carbon-rich raw material is gasified in the synthesis gas area at the high temperature of 800-1800 ℃ to prepare the catalyst containing mol fraction>70% CO and H 2 Is a raw gas of (1);
(2) Purifying, desulfurizing, dedusting and detoxifying in the purifying area: removing dust, desulfurizing and detoxication from the crude gas to remove substances toxic and harmful to chemical catalysts and power generation equipment to obtain clean gas;
(3) Water electrolysis in the water electrolysis area for hydrogen production: electrolyzing water in a water electrolysis area to prepare oxygen and hydrogen, wherein the hydrogen is used for chemical synthesis, the oxygen is used for coal gasification and gas power generation, and the electricity is used for the water electrolysis area; when the external photovoltaic wind power new energy is used for generating or storing electricity, the generated electricity can be sold;
(4) Gas distribution in gas distribution area: the clean gas is divided into chemical gas I and power generation gas I, when the raw material gas is coal gas of a single raw material, the power generation gas I is separated and extracted to obtain H by a membrane separation or a PSA method or a combination of the membrane separation and the PSA method 2 The chemical gas I is supplemented into the rotary flow to form chemical gas II, the generated gas II is called the generated gas II to be sent to gas steam power generation after hydrogen is extracted, and hydrogen and oxygen are prepared by supplying power to water, if the hydrogen-carbon ratio value in the chemical gas II isIf the optimal value f1 is not reached, hydrogen-carbon ratio is adjusted to an optimal value according to different chemical products by using hydrogen produced by electrolysis of water to form synthesis gas, and if the hydrogen-carbon value in the chemical gas II reaches the optimal value f1, the chemical gas II is directly taken as synthesis gas to be chemically synthesized;
when the raw material gas is a mixed gas of single raw material gas and multiple raw material gases, if the hydrogen-carbon ratio of the mixed gas reaches an optimized value f1, the generated electricity I is directly sent to gas steam for generating electricity without hydrogen extraction, and the chemical gas I is used as synthesis gas for chemical synthesis; if the hydrogen-carbon ratio of the mixed gas does not reach the optimized value f1, the power generation gas I is separated and extracted into H by using a membrane separation method or a PSA method or a combination of the membrane separation method and the PSA method 2 The diversion is supplemented into the chemical gas I to form chemical gas II, and then whether H from electrolyzed water is added or not is selected according to whether the hydrogen-carbon ratio value of the chemical gas II reaches an optimal value 2 The method comprises the steps of carrying out a first treatment on the surface of the The generated gas I is called generated gas II to send to gas steam to generate electricity after hydrogen is extracted, and hydrogen and oxygen are prepared by supplying power to water;
the optimized value f1 of the hydrogen-carbon ratio is 0.96-1.08 times of the theoretical hydrogen-carbon ratio f of the chemical product;
(5) Chemical synthesis in synthesis area: the synthesis gas reaching the optimized hydrogen-carbon ratio from the gas distribution area is compressed by a compressor to increase the pressure to the corresponding product reaction pressure and heated by the hot gas from the reactor to the active temperature of the catalyst of the selected product, and enters the reactor with a heat exchange tube in the catalyst bed for reaction, the byproduct steam is used for heat exchange to reach the catalytic reaction temperature controlled and regulated, the chemical reactor is completed by the temperature of the catalyst bed temperature difference of less than 20 ℃, the heat is recovered by heat exchange and cooling, the heat is fed into a gas-liquid separator, the separated liquid product is decompressed by an expander, the recovered energy is rectified by the product to the product standard requirement, and the chemical synthesis is sent out;
(6) Gas power generation and steam power generation: the power generation gas I or the power generation gas II firstly generates power through fuel gas, high-temperature gas at the outlet of the fuel gas machine exchanges heat through a boiler tube to generate steam, the steam for recovering heat from front to back of the centralized system is used for generating power through steam turbine steam, the generated power is used for electrolyzing water to prepare oxygen and hydrogen, and the power consumption for water electrolysis can be self-generated power of the system or external new energy power supply, namely wind power or solar photovoltaic power generation.
2. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: when the carbon-rich raw material is single raw material, it means coal, coke, asphalt and heavy oil, and the synthesis gas preparation is coal gasification, pyrolysis and coking, and when the chemical product is methyl alcohol, all raw material coal is made up by using O 2 And CO 2 Purifying, distributing gas to chemical synthesis after high temperature gasification at 1700 deg.c, and adopting water cooling pipe winding gas-solid phase methanol synthesis reactor with high heat exchange performance, pressure of 5-10 MPa and optimized hydrogen-carbon ratio f=1.95-2.08, circulation ratio r<2, when the poly-generation system gas power generation discharges CO 2 More CO than coal gasifier 2 At the same time, zero CO 2 During discharge, hydrogen can be added into purge gas after methanol product is separated by chemical synthesis to be pressurized to 10MPa, so that more CO is added 2 CO is carried out 2 Hydrogenation to methanol for CO consumption 2 Achieving the CO of the poly-generation system 2 Zero emission.
3. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: the multi-raw gas can adopt coal and purified natural gas conversion gas, coke oven gas conversion gas or steel mill blast furnace conversion gas, calcium carbide plant phosphoric acid plant gas or biomass gas to be purified to form CO and H according to project enterprises, regional resource raw material conditions and prices 2 The main purified mixed gas is used for adjusting the hydrogen amount to the hydrogen-carbon ratio f of the corresponding chemical products to manufacture the poly-generation products.
4. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: the range of the hydrogen-carbon ratio optimized value f1 is 0.975-1.04 times of the theoretical hydrogen-carbon ratio f of the chemical product.
5. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: the energy is recovered by adopting high-temperature coal gasification, medium-temperature chemical synthesis and gas-liquid separation energy optimization cascade utilization of low-temperature products, low-temperature gas material flow can be expanded by a pressurizing turbine, medium-temperature medium-pressure steam with the pressure of more than 2MPa produced by chemical synthesis can be increased to high-temperature high-pressure supercritical steam power generation by a coal gasification waste heat boiler, or different coaxial expanders, turbines and generators can be matched for blowers, compressors, pressurizing circulators, water pumps and chemical product liquid delivery pumps used for the system according to corresponding temperature, pressure and flow parameters, so that the traditional intercepting expansion of a pressure reducing valve is replaced, and the energy efficiency, the energy conservation and the consumption reduction are realized.
6. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: in the synthesis gas producing zone>Recovering heat by-product high temperature steam at 1000 ℃ by Wen Huzha, or using heat of high temperature slag for heating CO of a binary synthesis gas zone 2 And the energy utilization rate of the system is improved.
7. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: for different chemical products, advanced process control software APC special for technology is selected, and the hydrogen amount added to a gas distribution area is automatically regulated according to the chemical gas II, the hydrogen-carbon ratio at the inlet and outlet of the reactor and the product synthesis rate detection result, so that the deviation of the hydrogen-carbon ratio is timely and accurately regulated, and the optimal value is maintained to achieve high efficiency, energy conservation and consumption reduction.
8. The efficient coal-based raw material chemical-power poly-generation method according to claim 1, characterized by comprising the following steps: products of the chemical synthesis zone include, but are not limited to, one or more of methanol, ethanol, dimethyl ether, fischer-Tropsch oil, olefins, alkanes, methanation, acetic acid, acetate and hydrogen energy, and the generated electricity can be used for continuous water supply, electrolytic hydrogen production, fuel cells and various electric storage batteries.
9. The utility model provides a high-efficient coal-based raw materials chemical industry-power poly-generation device, includes system synthetic gas district, purification zone, chemical industry synthetic district and cogeneration district, its characterized in that still includes gas distribution district and water electrolysis district, system synthetic gas district including gasifier, waste heat boiler, purification zone including electric dust collecting equipment, the desulfurization equipment that connects gradually, gas distribution district include membrane separator, blender, chemical industry synthetic district include synthetic reactor, heat exchanger, water-cooler, gas-liquid separator, the cogeneration district include steam turbine, gas turbine, water electrolysis district including water electrolyzer, the oxygen-eliminating device that connects gradually, gasifier and waste heat boiler external steam turbine, waste heat boiler back and electric dust collecting equipment, desulfurization equipment connect gradually, the pipeline of play the desulfurization equipment divide two parts, be connected with gas holder and membrane separator respectively, membrane separator and synthetic reactor, water-cooler connect gradually.
10. The efficient coal-based raw material chemical-power poly-generation device according to claim 9, wherein: the device also comprises a safety gas holder, a hydrogen holder, an inlet and outlet pipeline with a regulating valve, an instrument for detecting temperature, pressure and flow in real time to form various parameters, and multi-parameter, multi-target digital, intelligent and optimal control equipment.
CN202310667035.XA 2023-06-06 2023-06-06 Efficient coal-based raw material chemical-power poly-generation method and device Pending CN116731754A (en)

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