CN219621111U - CO is realized to garbage power generation and photovoltaic power generation gas production coupling 2 Device for recovering and producing methanol - Google Patents
CO is realized to garbage power generation and photovoltaic power generation gas production coupling 2 Device for recovering and producing methanol Download PDFInfo
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- CN219621111U CN219621111U CN202320694145.0U CN202320694145U CN219621111U CN 219621111 U CN219621111 U CN 219621111U CN 202320694145 U CN202320694145 U CN 202320694145U CN 219621111 U CN219621111 U CN 219621111U
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Abstract
The utility model discloses a method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production 2 The utility model relates to a device for recovering and producing methanol, which comprises a garbage incineration boiler, a garbage generator set, heat exchange equipment, a flue gas dust removal unit, a flue gas condensation unit, a booster fan, an electrolytic water device, a methanol synthesis unit, a methanol rectification unit and a water treatment device, wherein the technology of the utility model uses O prepared by the electrolytic water device 2 And is partially rich in CO 2 The air combustion-supporting in the existing traditional garbage incineration boiler is replaced by the gas distribution of the flue gas, and the high-concentration CO in the flue gas 2 By recycling the raw material gas used for synthesizing the methanol, compared with the prior garbage incineration power generation and single photovoltaic power generation gas production for producing the methanol, the technology of the utility model not only can recycle 85 percent of CO generated by garbage power generation 2 In addition, the method can prevent the acid gas, heavy metal and the like in the flue gas from being discharged to the atmosphere, reduce the heat loss in the power generation process, and solve the problem of synthesizing the CO of the methanol by preparing the gas by single photovoltaic power generation 2 The cost of carbon source and raw material for producing methanol is too high.
Description
Technical Field
The utility model relates to the technical field of new energy and energy conservation, in particular to a method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production 2 A method for recovering and producing methanol.
Background
With the acceleration of the urban process in China, the generation amount of urban household garbage is continuously increased, and the effective treatment of the household garbage and the alleviation of ecological environment pollution are increasingly valued. The existing household garbage treatment technology mainly uses incineration power generation as a main part except for sanitary landfill and composting treatment, and generates a plurality of flue gases in the incineration treatment process, wherein about 30% of heat energy can be taken away by the flue gases, and harmful substances which can cause secondary pollution, such as acid gas, heavy metal, dioxin and the like, are generated. Therefore, there is an urgent need for a method for stably, quantitatively, efficiently and harmlessly treating municipal solid waste, which can reduce a large amount of pollution sources and protect the environment, and bring about certain economic and environmental benefits.
The traditional methanol production is to use fossil energy sources such as coal, natural gas and the like as raw materials, prepare synthetic gas through gasification or reforming technology, and then obtain methanol products through procedures such as compression, synthesis, rectification and the like, and discharge a large amount of CO2 into the atmosphere in the production process. Spring wind is applied in 2018,Zhang Tao, et al, put forward the concept of liquid sunlight, namely, the renewable energy sources such as solar energy are utilized to convert water and carbon dioxide to prepare liquid fuel, the national institute of chemical and physical company, and the Ministry of China, and petrochemical industry, et al, begin to build the first industrial demonstration project of liquid sunlight methanol synthesis worldwide, large-scale solar power generation is utilized to electrolyze water to produce hydrogen, and hydrogen generated by the renewable energy sources reacts with carbon dioxide to generate methanol, so that the energy of the renewable energy sources is stored in the liquid fuel methanol. However, the project has high cost of producing hydrogen by photovoltaic power generation in the production process, and synthesizing CO of methanol 2 And the electrolysis water comes from the outside, and the single photovoltaic power generation is used for producing the gas by the electrolysis water, so that the cost is not advantageous in the current stage compared with the traditional method for producing the methanol by taking the coal as the raw material.
Patent CN115354345A of Zhejiang university of industry Chen Chen et al discloses a comprehensive energy system combining photovoltaic photo-thermal coupling with garbage power generation and a process method thereof, solar energy photovoltaic and photo-thermal are utilized and combined with an amino thermochemical heat pump system to provide electricity and heat for an SOEC electrolysis system, solar power generation is utilized to drive air to be separated into nitrogen and oxygen, driving water is used for electrolysis into hydrogen and oxygen, oxygen is used as combustion improver for garbage incineration power generation, garbage incineration power generation outputs electric energy, high-temperature CO2 generated by the method can be directly mixed with water vapor and introduced into an SOEC electrolysis cell for CO-electrolysis to generate H2 and CO, then hydrogen and carbon monoxide are catalyzed into methanol by a catalyst, the utility model mainly focuses on a Solid Oxide Electrolysis Cell (SOEC) technology and a chemical heat pump technology to realize CO-production of electricity, methanol, ammonia and the like, the methanol production process is relatively complex, and raw materials for synthesizing the methanol need to pass through CO 2 Mixing with water vapor, introducing into SOEC electrolytic cell for co-electrolysis to generate H 2 And the reverse transformation process of CO, the link of methanol production is increased, and the energy consumption is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the following method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production 2 The method for recovering and producing the methanol not only can recover 85 percent of CO generated by garbage power generation 2 In addition, the emission of acid gas, heavy metal and the like in the flue gas to the atmosphere can be avoided, and the power generation process is reducedThe heat loss of the process solves the problem of synthesizing the CO of the methanol by using the single photovoltaic power generation gas 2 The cost of carbon source and raw material for producing methanol is too high.
CO is realized to garbage power generation and photovoltaic power generation gas production coupling 2 The method for recovering and producing the methanol comprises the steps of garbage incineration, garbage power generation, heat exchange, flue gas dust removal, flue gas condensation, electrolyzed water, water treatment, synthesis gas compression, gas purification, methanol synthesis and methanol rectification;
the external garbage is sent into a garbage incineration boiler for combustion, and O is prepared from an electrolytic water device 2 CO recycled with flue gas 2 Mixing the mixture according to a proportion to serve as a combustion improver, and sending medium-pressure superheated steam generated by garbage incineration to a garbage generator set for generating electricity at the temperature of 350-500 ℃ under the pressure of 3.5-4.5 MPa;
after heat exchange, flue gas dust removal and flue gas condensation, part of the flue gas discharged by the garbage incineration is conveyed to O by a booster fan and an electrolytic water device 2 Mixing and mixing according to a proportion, returning to garbage incineration, and sending the other part to a methanol synthesis device for removing water from condensate water generated by condensing smoke;
h prepared by electrolysis of water 2 Sending to methanol synthesis to prepare O 2 Sending the waste to incineration, wherein the electricity consumption of the electrolyzed water is from solar photovoltaic power generation;
h from electrolyzed water 2 And CO from flue gas 2 After the mixture is compressed by the synthesis gas, impurities are removed in a gas purifying device, and then 2H is carried out 2 +O 2 ＝H 2 Deoxidizing the O mixed gas, wherein water generated by the deoxidization is subjected to condensation and dehydration treatment device, and the condensed gas enters methanol for synthesis;
methanol synthesis 3H 2 +CO 2 ＝CH 3 OH+H 2 O reacts to generate methanol and chemical water, H at the inlet of a methanol synthesis device 2 And CO 2 Blending according to H 2 /CO 2 Controlling the temperature to be 2.0-3.2, purifying the methanol and water generated by methanol synthesis by a methanol rectification unit to obtain qualified methanol products, wherein steam required by methanol rectification is from the methanol synthesis unit, and a chemical water dehydration treatment device is generated by methanol rectification separation; the water treatment device receives the methanol synthesis unitThe deoxidized water, the alcohol-containing wastewater of the methanol rectifying unit and the condensed water generated by the flue gas condensing unit, and the treated hydration grid is sent to an electrolysis water device for preparing H 2 And O 2 。
The reaction pressure in the gas purification device is 2.0-10.0 MPa, the reaction temperature is 200-350 ℃, and 2.5-4.0 MPa steam is generated in the process; the synthesis pressure in the methanol synthesis is 5.0-10.0 MPa, the reaction temperature is 200-350 ℃, and 2.5-6.0 MPa steam is generated in the process.
CO is realized to garbage power generation and photovoltaic power generation gas production coupling 2 The device for recycling and producing the methanol comprises a garbage incineration boiler, a garbage generator set, heat exchange equipment, a flue gas dust removal unit, a flue gas condensation unit, a booster fan, an electrolytic water device, a methanol synthesis unit, a methanol rectification unit and a water treatment device, wherein the garbage incineration boiler is sequentially connected with the heat exchange equipment, the flue gas dust removal equipment, the flue gas condensation unit, the methanol synthesis unit and the methanol rectification unit, the garbage incineration boiler is also connected with the garbage generator set, the water treatment device is connected with the methanol synthesis unit and the methanol rectification unit through pipelines, the electrolytic water device is connected with the water treatment device and the methanol synthesis unit through pipelines, and the electrolytic water device is also connected with the garbage incineration boiler through the heat exchange equipment through the pipelines; the equipment is a whole device for generating electricity and producing methanol.
The garbage incineration boiler is preferably a grate incinerator, a rotary kiln incinerator or a circulating fluidized bed incinerator, and is matched with a waste heat boiler
The garbage generator set comprises a steam turbine and a generator, wherein the steam turbine is preferably used for extracting steam and condensing steam.
The methanol synthesis unit comprises a synthesis gas compressor, a gas purification device and a methanol synthesis device.
The methanol synthesis device is preferably a coiled pipe methanol synthesis reactor or a uniform temperature type methanol synthesis reactor,
the synthesis gas compressor is preferably an electrically driven centrifugal synthesis gas compressor or a steam turbine compressor.
Compared with the existing garbage incineration power generation and single photovoltaic power generation gas production for producing methanol, the technology has the following outstanding advantages:
1. o prepared by the process method of the utility model by using an electrolytic water device 2 And is partially rich in CO 2 The flue gas distribution replaces the air combustion supporting in the traditional garbage incineration boiler, and the co-combustion gas is rich in O 2 The temperature in the furnace is high, the garbage incineration is more thorough, the volume of discharged smoke is less than that of the traditional air combustion, and the heat efficiency is improved by about 5 percent.
2. O prepared by the process method of the utility model by using an electrolytic water device 2 And CO in flue gas circulation 2 The air distribution replaces the air in the existing traditional garbage incineration boiler to support combustion, and CO in the exhaust gas 2 High concentration of CO 2 Can recover 85 percent, has low energy consumption, greatly reduces the emission of the flue gas to the atmosphere, and thoroughly eliminates the pollution of acid gas and heavy metal in the flue gas to the environment.
3. By the technical method of the utility model, CO with high concentration in the flue gas 2 By recycling, the device is used as raw material gas for synthesizing methanol, compared with the existing single device for producing methanol by photovoltaic power generation gas, the device solves the problem of CO 2 Reducing CO for methanol production 2 Raw material cost.
4. H prepared by the water electrolysis device through the technological method of the utility model 2 O prepared by water electrolysis device and used as raw material gas for synthesizing methanol 2 The air is replaced for supporting combustion of the garbage incineration boiler, and compared with the existing method for producing the methanol by single photovoltaic power generation gas production, the method has the advantage that the utilization efficiency of the electrolyzed water gas production is higher.
5. The water used by the water electrolysis device is all from garbage raw materials, no external water replenishing is needed, all condensed water in the flue gas and chemical water generated by methanol synthesis are recovered through the water treatment device, and qualified water after water treatment is transmitted to the water electrolysis device.
The utility model is based on waste municipal domestic waste and solar renewable energy, and CO is achieved by coupling garbage power generation and photoelectric gas production 2 And the methanol is recovered and produced, so that the comprehensive energy efficiency is improved and the consumption is reduced.
Description of the drawings:
FIG. 1 is a schematic diagram of the utility model for realizing CO by coupling garbage power generation and photovoltaic power generation 2 The process flow diagram for recovering and producing methanol is shown.
FIG. 2 is a material flow diagram of the process of the present utility model.
Fig. 3 is an energy flow diagram of the method of the present utility model.
Detailed Description
The utility model is described in detail below with reference to the drawings and examples.
Example 1A photovoltaic power generation matched with garbage incineration power generation produces 435 tons of methanol per day
The process for producing the methanol by adopting the photovoltaic power generation gas production matched with the garbage incineration power generation is shown in the figure 1, wherein the material flow is shown in the figure 2, and the energy flow is shown in the figure 3.
Daily-treated municipal domestic waste 1084 tons (12.55 kg/s), and the garbage element composition C ar /18.63％、H ar /2.85％、O ar /11.72％、N ar /0.5％、S ar /0.2％、A ar /28.3％、M ar 37.8% of the low calorific value Q of the garbage net.ar 5.125MJ/Kg. The external garbage is sent to a garbage incineration boiler for combustion, and O is prepared from an electrolytic water device 2 And recycle CO in flue gas 2 Mixing according to O 2 /CO 2 The mixing ratio is 50 percent/50 percent, the ventilation quantity is 1.1 according to the excess air coefficient and is sent to a garbage incineration boiler, O 2 Design flow 21143Nm 3 And/h (8.39 kg/s), generating 3.82MPa, 450 ℃ medium-pressure superheated steam by heat release after garbage incineration, and using the steam with the steam flow of 75t/h for generating power by a garbage generator set, wherein the power supply quantity is 15.81MW; the temperature of the flue gas discharged by the garbage incineration boiler is 256 ℃, the temperature is reduced to 30 ℃ through a heat exchange device, a flue gas dust removal unit and a flue gas condensation unit in sequence, and the condensed flue gas is rich in CO 2 O prepared by boosting part of flue gas by adding fan and water electrolysis device 2 Mixed garbage incineration boiler, and exhaust gas amount 13480Nm returned to garbage incineration boiler 3 /h (12.95 kg/s), another portion of the flue gas flow 17868Nm 3 Delivering/h (9.62 kg/s) to a methanol synthesis unit and a condensate water dehydration treatment device generated by a flue gas condensation unit;
the methanol synthesis unit comprises a synthesis gas compressor, a gas purification device and a methanol synthesis device, and is from H prepared by an electrolytic water device 2 Flow rate 42286Nm 3 /h (1.06 kg/s), with CO 2 The flue gas is mixed, is firstly lifted to 2.4MPa by a synthetic gas compressor, firstly desulfurized, dechlorinated and other impurities are carried out by a gas purifying device, and then 2H is carried out 2 +O 2 ＝H 2 Deoxidizing O mixed gas at 200-350 deg.c to produce 2.5-4.0 MPa steam, condensing and dewatering water to obtain condensed gas H 2 /CO 2 Returning the ratio of 2.45 to the synthetic gas compressor to raise the pressure to 8.0MPa, and then feeding the synthetic gas into a methanol synthesis device according to CO 2 +3H 2 ＝CH 3 OH+H 2 O reaction type reaction is carried out, the reaction temperature of methanol is 250-280 ℃, 2.5-6.0 MPa steam is generated in the process, the product after the reaction is crude methanol containing methanol and water and is sent to a methanol rectifying unit, and steam generated by a methanol synthesizing unit is used as a heat source of the methanol rectifying unit.
The methanol rectifying unit is used for separating methanol from water to obtain qualified methanol products, the methanol flow rate is 435t/d (5.04 kg/s), the separated chemical water is sent to the water treatment device, and the heating steam of the methanol rectifying unit is from the methanol synthesis device and the gas purification device of the methanol synthesis unit.
H prepared by water electrolysis device 2 Delivering the O to a methanol synthesis unit and preparing the O by an electrolytic water device 2 Delivering the waste into a waste incineration boiler. The electrolysis electricity is generated by solar photovoltaic power, the electricity consumption is 190.3MW, the electrolysis water is from the water in the garbage, and external water supply is not needed.
The water treatment device receives deoxidized water from the methanol synthesis unit, alcohol-containing wastewater from the methanol rectification unit and condensed water from the flue gas condensing unit, and the purified water after water treatment is sent to the water electrolysis device.
The energy consumption is shown in the table below, the comprehensive energy efficiency is 49.61%, and the index is superior to the conventional garbage incineration power generation efficiency and the conventional coal-to-methanol energy efficiency.
Claims (6)
1. CO is realized to garbage power generation and photovoltaic power generation gas production coupling 2 Retrieve and produce the device of methyl alcohol, its characterized in that: the garbage incineration device comprises a garbage incineration boiler, a garbage power generator set, heat exchange equipment, a flue gas dust removal unit, a flue gas condensation unit, a booster fan, an electrolytic water device, a methanol synthesis unit, a methanol rectification unit and a water treatment device, wherein the garbage incineration boiler is sequentially connected with the heat exchange equipment, the flue gas dust removal equipment, the flue gas condensation unit, the methanol synthesis unit and the methanol rectification unit, the garbage incineration boiler is also connected with the garbage power generator set, the water treatment device is connected with the methanol synthesis unit and the methanol rectification unit through pipelines, the electrolytic water device is connected with the water treatment device and the methanol synthesis unit through pipelines, and the electrolytic water device is also connected with the garbage incineration boiler through the heat exchange equipment through the pipelines; the equipment is a whole device for generating electricity and producing methanol.
2. The method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production as described in claim 1 2 The device for recovering and producing the methanol is characterized in that the garbage incineration boiler is preferably a grate incinerator, a rotary kiln incinerator or a circulating fluidized bed incinerator, and is matched with a waste heat boiler.
3. The method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production as described in claim 1 2 The device for recovering and producing the methanol is characterized in that the garbage power generator set comprises a steam turbine and a generator, wherein the steam turbine is preferably used for extracting steam and condensing steam.
4. The method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production as described in claim 1 2 The device for recovering and producing the methanol is characterized in that the methanol synthesis unit comprises a synthesis gas compressor, a gas purification device and a methanol synthesis device.
5. The garbage power generation and photovoltaic of claim 4CO is realized by coupling power generation and gas production 2 The device for recovering and producing the methanol is characterized in that the methanol synthesis device is preferably a coiled pipe methanol synthesis reactor or a temperature-equalizing type methanol synthesis reactor.
6. The method for realizing CO by coupling garbage power generation and photovoltaic power generation gas production as in claim 4 2 The device for recovering and producing methanol is characterized in that the synthesis gas compressor is preferably an electrically driven centrifugal synthesis gas compressor or a steam turbine compressor.
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