Waste gas and solid waste comprehensive utilization system for methanol preparation through biomass gasification

Abstract

The utility model provides a waste gas and solid waste comprehensive utilization system for methanol preparation by biomass gasification. The waste gas and solid waste comprehensive utilization system comprises a gasification furnace, dust removal equipment, synthesis gas conversion equipment, a decarburization device, a methanol synthesis device and an activation device. The gasification furnace is used for carrying out gasification reaction on biomass to obtain a synthesis gas mixture; the dust removal equipment is provided with a first outlet and a second outlet and is used for receiving the synthesis gas mixture and separating out fly ash solid waste of the synthesis gas mixture, the first outlet can be used for discharging the synthesis gas mixture, and the second outlet can be used for discharging the fly ash solid waste; the synthesis gas conversion equipment is used for carrying out carbon monoxide conversion reaction on a synthesis gas mixture and obtaining synthesis converted gas; the decarburization device is used for removing part of carbon dioxide in the synthetic shift gas; the methanol synthesis device is used for receiving the synthesis shift gas and obtaining methanol; the activating device is communicated with the second outlet to receive the fly ash solid waste and waste gas carbon dioxide, and is used for activating the fly ash solid waste to obtain activated carbon.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of energy conversion technology, especially relates to a waste gas, solid waste comprehensive utilization system of biomass gasification methanol making. BACKGROUND

[0002] Compared with primary energy such as coal, oil and natural gas, biomass resources have the advantages of being renewable, polluting little and reducing carbon. In the prior art, in order to improve resource utilization, biomass is used to synthesize methanol, which mainly includes two steps. One step is that biomass is gasified to obtain raw gas, and the raw gas is treated to obtain methanol synthesis gas. The second step is that the synthesis gas is catalytically converted to generate methanol under certain conditions.

[0003] In the process of biomass gasification methanol making, there is a process of decarburization regeneration, which inevitably produces a large amount of CO2 waste gas. In addition, a large amount of fly ash and other solid waste is also produced in the gasification process. How to comprehensively utilize the waste gas and solid waste to reduce costs and increase product benefits is still a problem that needs to be continuously considered and solved. SUMMARY

[0004] In view of the fact that a large amount of CO2 waste gas and a large amount of fly ash and other solid waste are produced in the existing biomass gasification methanol making process, and the problem of how to comprehensively utilize the waste gas and solid waste to increase product benefits, the purpose of the utility model is to provide a waste gas and solid waste comprehensive utilization method and system for biomass gasification methanol making.

[0005] To solve the above technical problems, the utility model provides a waste gas and solid waste comprehensive utilization system for biomass gasification methanol making, which comprises:

[0006] A gasifier is used for gasification reaction of biomass to obtain a synthesis gas mixture.

[0007] A dust removal device is connected to the gas outlet end of the gasifier, and is provided with a first outlet and a second outlet. The dust removal device is used for receiving the synthesis gas mixture and separating fly ash solid waste from the synthesis gas mixture. The first outlet is used for discharging the separated synthesis gas mixture, and the second outlet is used for discharging the fly ash solid waste.

[0008] A synthesis gas shift device is connected to the first outlet of the dust removal device. The synthesis gas shift device is used for one carbon monoxide shift reaction of the separated synthesis gas mixture to obtain synthesis shift gas. The synthesis shift gas comprises carbon monoxide, carbon dioxide and hydrogen.

[0009] A decarburization device is used for removing part of the carbon dioxide in the synthesis shift gas to form carbon dioxide waste gas and synthesis reaction gas containing carbon dioxide.

[0010] a methanol synthesis device connected to the gas outlet end of the decarburization device for receiving the synthesis reaction gas containing carbon dioxide and performing a methanol synthesis reaction to obtain methanol;

[0011] an activation device connected to the second outlet to receive the fly ash solid waste, the activation device being connected to the decarburization device to receive the carbon dioxide waste gas, the activation device being used for the fly ash solid waste to perform an activation reaction to obtain activated carbon.

[0012] In one embodiment, the activation reaction of the activation device is performed at a temperature of 800-1000℃, the activation time is 2.5h-3.5h, the iodine adsorption value of the activated carbon is greater than 600mg / g, and the methylene blue adsorption value is greater than 120mg / g.

[0013] In one embodiment, a cracking furnace is further provided between the gasification furnace and the dust removal equipment, the cracking furnace is used for the biomass particles doped in the synthesis gas mixture to perform a further gasification reaction and for the tar and methane in the synthesis gas mixture to be cracked, and the cracking furnace is provided with an ash outlet through which the ash generated by the cracking furnace can be discharged.

[0014] In one embodiment, a first heat recovery device is further included, the first heat recovery device is arranged between the cracking furnace and the dust removal equipment, the gas inlet end of the first heat recovery device is connected to the cracking furnace, the gas outlet end of the first heat recovery device is connected to the dust removal equipment, the first heat recovery device can use the heat of the cracking furnace to vaporize liquid water in the first heat recovery device into first water vapor, and the exhaust port of the first heat recovery device is connected to the activation device so that the first water vapor flows into the activation device and performs an activation reaction with the fly ash.

[0015] In one embodiment, a rapping device is further included and arranged on the first heat recovery device, the first heat recovery device is provided with a communication pipeline communicating the gasification furnace and the dust removal equipment, the rapping device can apply a force to the communication pipeline to make the fly ash solid waste deposited in the communication pipeline fall off, and the first heat recovery device is further provided with a third outlet, the third outlet being connected to the activation device to recover the fly ash solid waste in the first heat recovery device;

[0016] a cooling device connected between the third outlet of the first heat recovery device and the activation device, the cooling device being capable of reducing the temperature of the fly ash solid waste.

[0017] In one embodiment, a first conveying device is further included, which is arranged between the third outlet of the first heat recovery device and the activation device, and is capable of conveying a first inert gas at a preset flow rate to a pipeline between the first heat recovery device and the activation device, so as to convey the fly ash solid waste to the activation device.

[0018] In one embodiment, a second conveying device is further included, which is arranged between the second outlet of the dust removal equipment and the activation device, and is capable of conveying a second inert gas at a preset flow rate to a pipeline between the second outlet of the dust removal equipment and the activation device, so as to convey the fly ash solid waste to the activation device.

[0019] In one embodiment, a separation device is further included, which is arranged between the gasification furnace and the cracking furnace, has a feed end connected to the gasification furnace, and has an exhaust port connected to the cracking furnace, and is used for solid-gas separation of the synthesis gas mixture.

[0020] A material returning device is further included, which is arranged between the separation device and the gasification furnace, and is capable of conveying the incompletely reacted biomass to the gasification furnace.

[0021] In one embodiment, a second heat recovery device is further included, which is connected to the synthesis gas shift device, is used for vaporizing liquid water in the second heat recovery device into second water vapor by using heat of the synthesis gas shift device, and has an exhaust port connected to the activation device, so that the second water vapor flows into the activation device and reacts with the fly ash solid waste.

[0022] In one embodiment, a dryer is further included, which is connected to an outlet of the activation device, and is used for drying the activated carbon generated by the activation device, and the moisture of the activated carbon at an outlet of the dryer is less than 10%.

[0023] In one embodiment, a desulfurization tower is further arranged between the synthesis gas shift device and the decarburization device, and is used for removing sulfur dioxide in the synthesis shift gas.

[0024] In one embodiment, the decarburization device includes a decarburization tower and a regeneration tower, the decarburization tower is connected between the synthesis gas shift device and the regeneration tower, and is used for adsorbing carbon dioxide waste gas in the synthesis shift gas, and the regeneration tower is connected between the decarburization tower and the activation device, and is used for conveying the carbon dioxide waste gas to the activation device.

[0025] In one embodiment, a water scrubber is provided between the dust removal device and the syngas shift device, and the water scrubber is used to remove tar in the syngas mixture.

[0026] In one embodiment, a compression device is provided between the dust removal device and the syngas shift device, and the compression device is used to pressurize the syngas mixture.

[0027] From the above technical solution, the advantages and positive effects of the present application are as follows:

[0028] The application provides a waste gas and solid waste comprehensive system for biomass gasification methanol production. The waste gas and solid waste comprehensive system for biomass gasification methanol production comprises a gasifier, a dust removal device, a syngas shift device, a decarburization device, a methanol synthesis device and an activation device. Biomass is converted into a syngas mixture through a thermochemical process in the gasifier. The syngas mixture obtained by biomass gasification contains a high content of fly ash, CO, CO2, CH4 and sulfide impurity gas. The fly ash solid waste in the syngas mixture is separated from the gas through the dust removal device, and then the CO is subjected to a shift reaction through the syngas shift device to obtain a syngas shift gas. Waste gas CO2 is generated in this step. Then, part of the CO2 in the syngas shift gas is removed through the decarburization device to form carbon dioxide waste gas and syngas containing carbon dioxide. The content of the waste gas CO2 can be controlled in this step to improve the methanol production rate and avoid excessive reaction of CO and H2 in the process of preparing methanol. The fly ash solid waste separated by the dust removal device can be used as a carbon source for preparing activated carbon in the activation device. The waste gas CO2 removed by the decarburization device is used as activation gas. The fly ash solid waste and the CO2 waste gas are subjected to an activation reaction through the activation device to obtain activated carbon. On the one hand, the fly ash solid waste and the CO2 waste gas generated in the decarburization device can be used for the activation reaction to prepare activated carbon, thereby realizing comprehensive utilization of the waste gas CO2 and the fly ash solid waste generated in the process of biomass gasification methanol production. Compared with the existing biomass methanol production process in which carbon residue is used as a carbon source to prepare activated carbon, the fixed carbon content in the fly ash used in the present application is higher, and the activated carbon prepared therefrom has higher quality. On the other hand, the removal of CO2 from the syngas shift gas obtained by the syngas shift device is beneficial to the subsequent methanol synthesis efficiency. At the same time, the CO2 in the syngas shift gas is used as activation gas to participate in the preparation reaction of activated carbon, which can effectively reduce the waste gas treatment cost in the process of biomass gasification methanol production, thereby effectively improving the economic benefit of biomass methanol. The comprehensive utilization of waste gas and solid waste resources reduces the treatment cost of waste gas and solid waste in the production process, and improves the core competitiveness of biomass methanol. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a waste gas and solid waste comprehensive utilization system of a biomass gasification methanol production according to an embodiment of the present application;

[0030] Figure 2 is a flow chart of a control method of a waste gas and solid waste comprehensive utilization system of a biomass gasification methanol production according to an embodiment of the present application.

[0031] The reference signs are explained as follows:

[0032] 1, biomass storage bin; 2, belt conveying assembly; 3, feeding hopper; 4, feeding machine; 5, gasification furnace; 6, separation device; 7, cracking furnace; 8, first heat recovery device; 9, dust removal equipment; 10, water washing tower; 11, compression equipment; 12, synthesis gas shift device; 13, desulfurization tower; 14, decarburization device; 141, decarburization tower; 142, regeneration tower; 15, methanol synthesis device; 16, activation device; 17, dryer; 18, second heat recovery device; 19, methanol rectification tower. DETAILED DESCRIPTION

[0033] While the present application can be susceptible to embodiment in different forms, only some of the specific embodiments are shown and described in the drawings and are described in detail in the present specification, and it can be understood that the present specification should be considered as a demonstrative explanation of the principles of the present application, and is not intended to limit the present application to that described herein.

[0034] Thus, one feature indicated in the present specification will be used to explain one feature of an embodiment of the present application, and is not intended to imply that each embodiment of the present application must have the explained feature. In addition, it should be noted that the present specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise specified, the described combinations are not intended to be limiting.

[0035] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) are used to explain the structure and movement of various elements of the present application, and are not absolute but relative. These indications are appropriate when these elements are in the positions shown in the drawings. If the positions of these elements change, these indications of directions will also change accordingly.

[0036] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Figure 1 Figure 1 is a structural schematic diagram of a biomass gasification methanol waste gas and solid waste comprehensive utilization system according to an embodiment of the present application.

[0038] Please refer to the accompanying Figure 1 Figure 1 is a structural schematic diagram of a biomass gasification methanol waste gas and solid waste comprehensive utilization system according to an embodiment of the present application.

[0039] The gasifier 5 is used for biomass gasification reaction to obtain a synthesis gas mixture. The upstream of the gasifier 5 is further provided with a biomass storage bin 1, and a feeding device for conveying the biomass in the biomass storage bin 1 to the gasifier 5. The feeding device includes a belt conveying assembly 2, a feeding hopper 3, a feeder 4 and the like, so as to automatically convey the biomass into the gasifier 5 for reaction.

[0040] It should be noted that the biomass can include crops and their waste: such as straw, rice husk, corn cob and the like. Through the gasifier 5, the biomass can be efficiently converted into a synthesis gas mixture rich in CO, CO2, CH4, water vapor and sulfide, and it should be noted that the synthesis gas mixture contains fly ash solid waste generated in the gasification reaction.

[0041] Further, the gasifier 5 is provided with a discharge port for discharging the ash generated after the biomass gasification reaction.

[0042] The dust removal equipment 9 is connected with the gas outlet end of the gasifier 5, so that the synthesis gas mixture generated in the gasifier 5 can enter the dust removal equipment 9 through the gas outlet end of the gasifier 5. Specifically, the inside of the dust removal equipment 9 is usually provided with a separation structure, so that after the dust removal equipment 9 receives the synthesis gas mixture, the fly ash solid waste and other solid particles in the synthesis gas mixture can be effectively separated from the gas components, thereby reducing the fly ash solid waste and other solid particles in the synthesis gas mixture, and providing high-quality raw gas for subsequent chemical reaction and product synthesis.

[0043] Specifically, the dust removal device 9 is provided with a first outlet and a second outlet. The first outlet is mainly used to discharge the synthetic gas mixture after the dust removal separation treatment, and these gases will continue to flow to the subsequent synthetic gas shift device 12, decarbonization device 14 and methanol synthesis device 15 and the like for further chemical reaction and product synthesis. The second outlet is used to discharge the fly ash solid waste separated from the synthetic gas mixture.

[0044] The synthetic gas shift device 12 is connected with the first outlet of the dust removal device 9, so that the synthetic gas mixture after the dust removal treatment can directly enter the synthetic gas shift device 12 for the next step of chemical reaction. Among them, the synthetic gas shift device 12 can be used for the carbon monoxide in the synthetic gas mixture to carry out a shift reaction and obtain a synthetic shift gas.

[0045] Specifically, the carbon monoxide in the synthetic gas mixture and the water vapor occur a shift reaction in the synthetic gas shift device 12, and the reaction formula is as follows:

[0046] CO + H2O ⇌CO2 + H2;

[0047] In the shift reaction, part of the carbon monoxide in the synthetic gas mixture is converted into carbon dioxide, and more hydrogen is generated at the same time. The synthetic shift gas obtained after the carbon monoxide shift reaction includes carbon monoxide, carbon dioxide and hydrogen.

[0048] It should be noted that the shift reaction not only regulates the content of H2, but also increases the content of CO2, and CO2 is to participate in the subsequent methanol synthesis reaction, so the content of CO2 can be controlled to improve the production rate of methanol, on the other hand, it can also avoid the reaction of CO and H2 in the methanol synthesis reaction too intense, so that the temperature of the bed layer can be kept stable, thereby ensuring the activity of the catalyst.

[0049] The decarbonization device 14 is connected with the synthetic gas shift device 12, and the decarbonization device 14 can be used to remove the carbon dioxide waste gas in the synthetic shift gas. After the decarbonization device, carbon dioxide waste gas and synthetic reaction gas containing carbon dioxide are formed, wherein the decarbonization device 14 is connected with the activation device 16 to transport the collected carbon dioxide waste gas to the activation device 16, and the synthetic reaction gas containing carbon dioxide is used in the subsequent methanol preparation process.

[0050] It should be noted that the decarburization device 14 removes CO2 in the synthesis gas, and compared with the aforementioned synthesis shift gas, the synthesis reaction gas is formed by removing part of the carbon dioxide from the synthesis shift gas, so the carbon dioxide content in the synthesis reaction gas is lower than that in the synthesis shift gas. The removed CO2 can not only be used as an active gas for synthesis of activated carbon, but also can control the CO2 content of the synthesis reaction gas within a predetermined range, so that the methanol synthesis reaction reaches the best working condition, and the synthesis efficiency of methanol is improved.

[0051] The methanol synthesis device 15 is connected to the gas outlet end of the decarburization device 14, for receiving the synthesis reaction gas containing carbon dioxide and performing methanol synthesis reaction to obtain methanol. The methanol synthesis reaction formula is as follows:

[0052] CO2 + H2 = CH3OH + H2O.

[0053] The outlet end of the methanol synthesis device 15 is connected to the methanol rectification tower 19, which can remove water and other by-products in the methanol. In more detail, the rectification tower can utilize the different boiling points of various components, vaporize the components with low boiling points (such as methanol) by heating, and condense and collect at the top of the tower, while the components with high boiling points (such as water) remain at the bottom of the tower. Through multi-stage rectification and reflux operation, the purity of methanol can be further improved.

[0054] The activation device 16 is connected to the second outlet to receive the fly ash solid waste, and is connected to the decarburization device 14 to receive the waste carbon dioxide, and is used for the fly ash solid waste to perform an activation reaction to obtain activated carbon.

[0055] Specifically, the fly ash solid waste separated by the dust removal equipment 9 can be used as a carbon source for preparing activated carbon, and then the carbon dioxide waste gas removed from the synthesis shift gas in the decarburization device 14 is used as an activation gas. At a higher temperature, the carbon in the fly ash solid waste will chemically react with the carbon dioxide waste gas. This activation reaction can be called Boudouard reaction. With the progress of the Boudouard reaction, the carbonaceous material in the fly ash solid waste is gradually consumed, and new pores are formed. These newly formed pores provide high specific surface area and porosity for activated carbon, which is an important basis for the adsorption performance of activated carbon. At the same time, due to the oxidation of part of the carbon, the density of the activated carbon is also reduced, further increasing its adsorption capacity. After the reaction is completed, activated carbon can be prepared.

[0056] It should be noted that the fly ash solid waste generated in the biomass gasification process has a particle size of 1-100 μm, which is easy to be carried out by the gas mixture. The fixed carbon content of the fly ash solid waste is high, and the fly ash solid waste has the characteristics of internal porosity and loose structure, and the use of fly ash solid waste as a raw material for preparing activated carbon can not only effectively recover the fly ash solid waste for utilization, but also produce high-quality activated carbon.

[0057] Compared with the prior art, the fixed carbon content of the fly ash solid waste used in the present application is higher, and the activated carbon prepared therefrom has higher quality. Moreover, the process equipment for the activation reaction using carbon residue as a carbon source can be simplified. On the other hand, the fly ash solid waste and the waste gas CO2 generated in the decarburization device 14 can be used for the activation reaction to prepare activated carbon, so that the CO2 byproduct generated in the decarburization device 14 can be effectively utilized, further reducing the cost of treating the CO2 byproduct, and realizing the comprehensive utilization of the waste gas CO2 and the fly ash solid waste generated in the biomass gasification methanol process. Moreover, the removal of CO2 from the synthesis shift gas obtained in the synthesis shift device 12 forms a synthesis reaction gas that is beneficial to the subsequent methanol synthesis efficiency. At the same time, the CO2 in the synthesis shift gas can be used as an activation gas for the preparation of activated carbon, which can effectively reduce the waste gas treatment cost in the biomass gasification methanol process, thereby effectively improving the economic benefit of biomass methanol, and reducing the treatment cost of waste gas and solid waste in the production process, and improving the core competitiveness of biomass methanol.

[0058] In some specific embodiments, the activation reaction is carried out at a temperature of 800-1000℃, and the activation time is 2.5h-3.5h, and the iodine adsorption value of the activated carbon is greater than 600mg / g, and the methylene blue adsorption value is greater than 120mg / g. In this way, by controlling the reaction temperature of the fly ash solid waste in the activation device to be 800-1000℃ and the activation time to be 2.5h-3.5h, the activation reaction of the fly ash solid waste can be more effectively carried out to obtain activated carbon with high quality. Through the control of the above reaction temperature and time, activated carbon with an iodine adsorption value greater than 600mg / g and a methylene blue adsorption value greater than 120mg / g can be prepared.

[0059] It should be noted that the iodine adsorption value can be used to indicate the stronger the adsorption capacity of activated carbon. The activated carbon prepared by the waste gas and solid waste comprehensive utilization system of the biomass gasification methanol process of the present application has an iodine adsorption value greater than 600mg / g, and the activated carbon obtained by the present system has a strong adsorption capacity for iodine and can adsorb more iodine.

[0060] The methylene blue adsorption value is an index of the adsorption capacity of activated carbon to organic substances. The activated carbon prepared by the biomass gasification methanol waste gas and solid waste comprehensive utilization system has a methylene blue adsorption value greater than 120 mg / g, and the activated carbon has a strong adsorption capacity to organic substances.

[0061] Preferably, the activation time can be selected as 3h.

[0062] In some specific embodiments, the biomass gasification methanol waste gas and solid waste comprehensive utilization system further comprises a second conveying device (not shown in the figure) arranged between the second outlet of the dust removal equipment 9 and the activation device 16. By arranging the second conveying device, the conveying problem of fly ash solid waste between the dust removal equipment 9 and the activation device 16 can be solved, and the fly ash solid waste can be smoothly and efficiently transported into the activation device 16 for subsequent treatment.

[0063] The second conveying device can convey a second inert gas with a preset flow rate to the pipeline between the second outlet of the dust removal equipment 9 and the activation device 16, so as to convey the fly ash to the activation device 16.

[0064] Specifically, the second inert gas can use inert gas or other non-flammable gas, for example, the second inert gas can include at least one of argon, nitrogen, and carbon dioxide, so that the second inert gas can effectively isolate oxygen, and even the risk of combustion or explosion during the conveying of fly ash solid waste.

[0065] Further, by conveying the second inert gas with a preset flow rate into the pipeline, the collected fly ash after dust removal is carried and conveyed to the activation device 16, so that the inert gas and the fly ash solid waste can form a stable gas flow in the pipeline, thereby facilitating the uniform dispersion and conveying of the fly ash solid waste to the activation device 16, and further reducing the risk of explosion caused by local high temperature or static electricity accumulation in the pipeline conveying the fly ash solid waste, improving the safety of recycling the fly ash solid waste, so that the fly ash solid waste can be smoothly and efficiently transported into the activation device 16 for subsequent treatment.

[0066] Please refer to Figure 1 In some specific embodiments, a cracking furnace 7 is further arranged between the gasification furnace 5 and the dust removal equipment 9, the cracking furnace 7 is used for further gasification reaction of the biomass particles doped in the synthesis gas mixture and cracking of the tar and methane in the synthesis gas mixture, and the cracking furnace 7 is provided with an ash outlet for discharging the ash generated by the cracking furnace 7.

[0067] The cracking furnace 7 can further make the biomass particles that failed to be completely gasified in the gasification furnace 5 to undergo further gasification reaction, and the cracking furnace 7 can also effectively crack the tar and methane in the synthesis gas mixture. In this way, the further gasification and cracking process in the cracking furnace 7 can effectively improve the purity and quality of the synthesis gas mixture, and provide better raw materials for subsequent methanol synthesis.

[0068] The cracking furnace 7 is provided with an ash outlet, which can timely discharge the waste residues such as the biomass residues that failed to be completely gasified and the like from the system during the cracking process. Then, the fly ash solid waste produced in the cracking furnace 7 will continue to be conveyed to the dust removal device along with the synthesis gas mixture.

[0069] The biomass gasification and methanol co-production active carbon system further comprises a first heat recovery device 8. The first heat recovery device 8 is arranged between the cracking furnace 7 and the dust removal device 9, and its main function is to recover the high-temperature heat energy carried by the synthesis gas mixture at the outlet of the cracking furnace 7.

[0070] In detail, the gas inlet end of the first heat recovery device 8 is connected with the cracking furnace 7, and the gas outlet end of the first heat recovery device 8 is connected with the dust removal device 9. During the process that the synthesis gas mixture flows from the cracking furnace 7 to the dust removal device 9 through the first heat recovery device 8, the liquid water in the first heat recovery device 8 is vaporized into first water vapor by using the high-temperature heat energy carried by the synthesis gas mixture. The exhaust port of the first heat recovery device 8 is connected with the activation device 16, so that the first water vapor flows to the activation device 16 and reacts with the fly ash. In this way, not only the heat energy is recovered, but also the water vapor is generated as a standby active gas for the activation reaction. The arrangement of the first heat recovery device 8 helps the reaction process of the fly ash solid waste being activated into active carbon, further improves the yield and quality of the active carbon, and further reduces the waste of energy and the operation cost of the system.

[0071] Please refer to Figure 1 In some specific embodiments, the biomass gasification and methanol production waste gas and solid waste comprehensive utilization system further comprises a vibrating device.

[0072] The first heat recovery device 8 is provided with a communication pipeline that communicates the gasification furnace 5 and the dust removal device 9, and the communication pipeline serves as a channel for the synthesis gas mixture to flow through. The vibrating device is arranged on the first heat recovery device 8, and the vibrating device can apply a force to the communication pipeline to make the fly ash solid waste deposited in the communication pipeline fall off. In this way, the fly ash solid waste can be prevented from accumulating in the pipeline, the smooth flow of the gas flow can be ensured, and the pipeline blockage and the increase of pressure drop can be avoided.

[0073] The first heat recovery device 8 is further provided with a third outlet connected with the activation device 16, so that the fly ash solid waste shaken off by the shaking device can be recovered through the third outlet and sent into the activation device 16 for activation reaction, realizing the recycling of the fly ash solid waste and further improving the resource utilization rate.

[0074] It should be noted that the fly ash solid waste can be effectively collected and utilized by starting the shaking device regularly or according to a preset scheme, and the frequency and difficulty of system maintenance can be reduced by timely removing the fly ash solid waste, thereby prolonging the service life of the equipment.

[0075] In some specific embodiments, the waste gas and solid waste comprehensive utilization system for biomass gasification methanol production further comprises a cooling device connected between the third outlet of the first heat recovery device 8 and the activation device 16, and the cooling device is used to reduce the temperature of the fly ash solid waste.

[0076] More specifically, the cooling device can be a dust cooler, and a first bin body can be arranged in the pipeline downstream of the third outlet of the first heat recovery device 8, and the dust cooler is arranged on the first bin body. The fly ash solid waste in the first heat recovery device 8 flows to the first bin body through the third outlet, and the fly ash solid waste can be cooled in the first bin body by natural cooling or under the action of the dust cooler, thereby avoiding the influence of high temperature of the fly ash solid waste on the conveying pipeline, and further prolonging the service life and safety of the equipment and pipeline in the system.

[0077] In some specific embodiments, the waste gas and solid waste comprehensive utilization system for biomass gasification methanol production further comprises a first conveying device (not shown in the figure) arranged between the third outlet of the first heat recovery device 8 and the activation device 16. By arranging the first conveying device, the problem of conveying the fly ash solid waste from the first heat recovery device 8 to the activation device 16 can be solved, which is conducive to the smooth and efficient entry of the fly ash solid waste into the activation device 16 for subsequent treatment.

[0078] The first conveying device can convey a first inert gas with a preset flow rate to the pipeline of the first heat recovery device 8 and the activation device 16, so as to convey the fly ash solid waste to the activation device 16.

[0079] Specifically, the first inert gas can use inert gas or other non-flammable gas, for example, the first inert gas can include at least one of argon, nitrogen, and carbon dioxide, so that the first inert gas can effectively isolate oxygen, and even the risk of combustion or explosion during conveying the fly ash solid waste.

[0080] Furthermore, by conveying a first inert gas with a preset flow rate into the pipeline, the fly ash collected by the first heat recovery device 8 is carried and transported to the activation device 16. In this way, the inert gas and the fly ash solid waste can form a stable airflow in the pipeline, which is conducive to the uniform dispersion and transportation of the fly ash solid waste to the activation device 16. This can further reduce the risk of explosion caused by local high temperature or static electricity accumulation in the pipeline transporting fly ash solid waste, improve the safety of recycling fly ash solid waste, and facilitate the smooth and efficient entry of fly ash solid waste into the activation device 16 for subsequent processing.

[0081] like Figure 1 As shown, in some specific embodiments, the comprehensive utilization system for waste gas and solid waste from biomass gasification to methanol also includes a separation device 6, which is located between the gasifier 5 and the pyrolysis furnace 7.

[0082] It should be noted that the separation device 6 can perform solid-gas separation on the syngas mixture produced by the gasifier 5. During the gasification process, the biomass feedstock is converted into a mixture containing gas, liquid, and solid particles at high temperatures. These solid particles include unreacted biomass, coke, ash, etc. If they directly enter the pyrolysis furnace 7, they will adversely affect the pyrolysis reaction, such as clogging the equipment and reducing reaction efficiency. The separation device 6 can effectively separate these solid particles from the gas, ensuring that the gas entering the pyrolysis furnace 7 is purer, thereby improving the efficiency and quality of the pyrolysis reaction.

[0083] In detail, the feed end of the separation device 6 is connected to the gasifier, so that the syngas mixture generated by the gasifier 5 can enter the separation device 6 through the feed port; the exhaust port of the separation device is connected to the pyrolysis furnace, so that the syngas mixture enters the pyrolysis furnace 7 after being separated by the separation device 6.

[0084] On the one hand, the separation device 6 can initially separate the synthesis gas mixture, which can effectively reduce the possibility that the fly ash separated in the subsequent dust removal system may contain a large amount of ash residue, thus affecting the quality of activated carbon preparation.

[0085] To give a more detailed example, the separation device 6 can be designed as a cyclone separator. The cyclone separator uses the rotational motion of the airflow to throw solid particles with large inertial centrifugal force toward the outer wall surface and separate them, which can effectively improve the separation efficiency and thus effectively separate solid particles from the gas.

[0086] Further, the waste gas and solid waste comprehensive utilization system for biomass gasification methanol production further comprises a back feeding device. The back feeding device is arranged between the separation device and the gasification furnace, and the back feeding device is used to feed the unreacted biomass into the gasification furnace. In order to further utilize the unreacted biomass in the gasification reaction, the back feeding device is arranged, so that the unreacted biomass in the gasification reaction obtained by the separation device is fed back into the gasification furnace, thereby effectively improving the conversion and utilization efficiency of the biomass and improving the resource utilization capacity of the system.

[0087] As shown in some specific embodiments, the waste gas and solid waste comprehensive utilization system for biomass gasification methanol production further comprises a second heat recovery device 18, the second heat recovery device 18 is connected with the syngas shift device 12, the second heat recovery device 18 is used to utilize the heat of the syngas shift device 12 to vaporize the liquid water in the second heat recovery device 18 into the second water vapor, and the exhaust port of the second heat recovery device 18 is connected with the activation device 16, so that the second water vapor flows into the activation device 16 and reacts with the fly ash solid waste. Figure 1

[0088] Specifically, by connecting the second heat recovery device 18 with the syngas shift device 12, the heat released in the syngas shift process can be recovered, and the liquid water in the second heat recovery device 18 is vaporized into the second water vapor, which not only realizes the conversion of heat, but also the second water vapor can flow into the activation device 16 through the exhaust port, and in the activation device 16, the water vapor fully contacts with the fly ash solid waste and reacts with it, promoting the activation process of the fly ash.

[0089] It should be noted that in the reaction of activating the fly ash into activated carbon in the present application, the waste gas carbon dioxide generated by the decarburization device 14 is mainly used as the active gas, and the water vapor generated by the first heat recovery device 8 and the second heat recovery device 18 is used as the standby active gas. CO2 is supplied by using the waste gas carbon dioxide generated by the decarburization device 14 and the water vapor generated by the first heat recovery device 8 and the second heat recovery device 18 as the active gas in a double-source supply mode, so that even if the supply of CO2 is problematic, the water vapor can be supplemented in time to ensure the smooth progress of the activation reaction. In this way, not only the emission of greenhouse gas CO2 can be reduced, but also the water vapor generated by the first heat recovery device 8 and the second heat recovery device 18 can be supplemented in time when the supply of CO2 is insufficient or the reaction conditions need to be adjusted, thereby further ensuring the continuity and stability of the activation reaction.

[0090] ​Further, water vapor is mainly used as a standby active gas in the system for preparing activated carbon from fly ash in the present application, but water vapor can synergize with carbon dioxide to further enhance the effect of the activation reaction. For example, water vapor can react with some components in fly ash solid waste to generate hydrogen and other reducing gases, which are helpful for the generation of activated carbon and the formation of pore structure.

[0091] In some specific embodiments, the waste gas and solid waste comprehensive utilization system for biomass gasification methanol production further comprises a dryer 17 connected to the outlet of the activation device 16, and the dryer 17 is used to dry the activated carbon generated by the activation device 16.

[0092] In the activation process, although water vapor reacts with fly ash solid waste to promote the generation of activated carbon, there is often some water remaining on the surface and inside of the activated carbon. The main function of the dryer 17 is to dry the activated carbon generated by the activation device 16, so as to avoid the influence of the residual liquid on the adsorption performance and use effect of the activated carbon, and thus to enable the system to produce activated carbon products with higher quality. Specifically, after being treated by the dryer 17, the moisture content of the activated carbon at the outlet of the dryer is less than 10%. In some specific embodiments, a desulfurization tower 13 is further arranged between the syngas conversion device 12 and the decarbonization device 14, and the desulfurization tower 13 is used to remove sulfur dioxide in the syngas. In the desulfurization tower 13, sulfur dioxide in the syngas is removed through a chemical reaction or a physical adsorption process, thereby reducing the SO2 content in the exhaust gas

[0093] In some specific embodiments, the decarbonization device 14 comprises a decarbonization tower 141 and a regeneration tower 142, the decarbonization tower 141 is connected between the syngas conversion device 12 and the regeneration tower 142, and the decarbonization tower 141 is used to adsorb waste carbon dioxide in the syngas, and the regeneration tower 142 is connected between the decarbonization tower 141 and the activation device 16, and is used to deliver waste carbon dioxide to the activation device 16.

[0094] In detail, the decarbonization tower 141 is connected between the syngas conversion device 12 and the regeneration tower 142, can receive the syngas from the syngas conversion device 12, and perform carbon dioxide adsorption treatment. For example, the decarbonization tower 141 can be filled with a carbon dioxide adsorbent, and the syngas treated by the decarbonization tower 141 has a significantly reduced carbon dioxide content, providing a more pure raw gas for subsequent processes.

[0095] The regeneration tower 142 is connected between the decarbonization tower 141 and the activation device 16, and can receive the adsorbent saturated with adsorption from the decarbonization tower 141 and perform desorption treatment of carbon dioxide. In the regeneration tower 142, the carbon dioxide molecules on the carbon dioxide adsorbent can be desorbed by heating or reducing pressure, etc., to form a high-concentration carbon dioxide gas stream. These carbon dioxide gas streams are then transported to the activation device 16 as the main active gas for activating the fly ash solid waste into activated carbon.

[0096] In some specific embodiments, a water washing tower 10 is arranged between the dust removal device 9 and the synthesis gas conversion device 12, and the water washing tower 10 is used to remove tar in the synthesis gas mixture.

[0097] Although most of the solid particles have been removed after the synthesis gas mixture passes through the dust removal device 9, it may still contain a certain amount of tar and other sticky substances. If these tar substances directly enter the synthesis gas conversion device 12, they may block the catalyst pores, reduce the catalyst activity, and even affect the normal operation of the device. The water washing tower 10 can remove the tar substances in the gas, causing them to deposit at the bottom of the water washing tower 10 or be discharged with the water flow. This protects the key components in the subsequent processes such as the synthesis gas conversion device 12 from pollution and blockage, and improves the stability and reliability of the system.

[0098] In some specific embodiments, a compression device 11 is arranged between the dust removal device 9 and the synthesis gas conversion device 12, and the compression device 11 is used to pressurize the synthesis gas mixture. By pressurizing the synthesis gas mixture, it can ensure that the subsequent processes are carried out under stable pressure conditions to improve reaction efficiency and increase yield, thereby improving the stability and reliability of the entire process.

[0099] In some specific embodiments, a compression device 11 is arranged between the decarbonization tower 141 and the methanol synthesis device 15, and the compression device 11 can pressurize the synthesis conversion gas after passing through the decarbonization tower 141.

[0100] More specifically, the compression device 11 can use a compressor.

[0101] Another aspect of the application provides a preparation method for comprehensive utilization of waste gas and solid waste in a biomass gasification methanol production system. The preparation method is applied to the biomass gasification methanol production system in any of the above embodiments. The preparation method comprises:

[0102] S1: Biomass is subjected to a gasification reaction in the gasification furnace 5 to obtain a synthesis gas mixture;

[0103] S2: The synthesis gas mixture is transported to the dust removal device 9 to separate fly ash from the synthesis gas mixture;

[0104] S3: The synthesis gas mixture separated by the dust removal device 9 is transported to the synthesis gas shift device 12, and the synthesis gas mixture is subjected to a carbon monoxide shift reaction to obtain synthesis shift gas, wherein the synthesis shift gas comprises CO, CO2 and H2, and the carbon monoxide shift reaction is as follows:

[0105] CO + H2O = CO2 + H2;

[0106] S4: The synthesis shift gas is transported to the decarburization device 14 to remove part of the carbon dioxide in the synthesis shift gas to form carbon dioxide waste gas and synthesis reaction gas containing carbon dioxide, and the synthesis reaction gas containing carbon dioxide is transported to the methanol synthesis device 15 to prepare methanol; the reaction formula is as follows:

[0107] CO2 + 3H2 = CH3OH + H2O

[0108] S5: The fly ash solid waste in the dust removal device 9 and the carbon dioxide in the decarburization device 14 are collected by the activation device 16, wherein the carbon dioxide waste gas is used as an activation gas to activate the fly ash solid waste, and activated carbon is prepared.

[0109] The reaction formula for activating the fly ash solid waste by using the carbon dioxide waste gas as the activation gas is as follows:

[0110] C + CO2 → 2CO.

[0111] In the gasification furnace 5, the biomass is subjected to a gasification reaction to generate a synthesis gas mixture mainly composed of carbon monoxide, hydrogen, carbon dioxide, methane, fly ash and a small amount of other gases. Then, the synthesis gas mixture is transported to the dust removal device 9 to separate the fly ash solid waste in the gas. Then, the synthesis gas mixture after dust removal enters the synthesis gas shift device 12 to perform a carbon monoxide shift reaction under the action of a catalyst, thereby increasing the content of hydrogen and adjusting the gas composition to provide more suitable raw material gas for subsequent methanol synthesis. Then, the synthesis shift gas after the shift reaction is first subjected to the decarburization device 14 to remove part of the carbon dioxide therein, and the CO2 content is regulated within a predetermined range to enable the methanol synthesis reaction to reach the best working condition. Then, it is sent to the methanol synthesis device 15, and in the methanol synthesis device 15, the carbon dioxide and hydrogen in the synthesis reaction gas are converted into methanol through a catalytic reaction.

[0112] The fly ash solid waste from the dust removal device 9 and the carbon dioxide waste gas generated in the decarburization device 14 are collected in the dust removal device 9 and sent to the activation device 16 for activation treatment, wherein the carbon dioxide waste gas is used as an activation gas to react with the carbonaceous components in the fly ash solid waste at high temperature to form activated carbon with a porous structure. The activated carbon has good adsorption performance and can be widely used in the fields of environmental protection, water treatment and food processing.

[0113] The disclosed method for comprehensive utilization of waste gas and solid waste in the process of biomass gasification for methanol production uses the fly ash solid waste separated by the dust removal equipment 9 as the carbon source for preparing activated carbon in the activation device 16, and removes the obtained waste gas CO2 in the decarburization device 14 as the activation gas to further prepare activated carbon. Not only is the comprehensive utilization of the waste gas CO2 and fly ash solid waste generated in the process of biomass gasification for methanol production achieved, but also the cost of treating the CO2 byproduct is reduced, and the fixed carbon content in the fly ash is higher, and the activated carbon prepared therefrom has higher quality.

[0114] In some specific embodiments, the pyrolysis furnace 7 and the first heat recovery device 8 are connected between the gasification furnace 5 and the dust removal equipment 9, the pyrolysis furnace 7 converts the biomass particles mixed in the synthesis gas mixture and cracks the tar and methane, and the first heat recovery device 8 recovers the heat of the pyrolysis furnace 7 to gasify the liquid water in the first heat recovery device 8 into first water vapor;

[0115] The first water vapor generated by the first heat recovery device 8 is collected by the activation device 16, wherein the first water vapor is used as the activation gas for activating the fly ash, and activated carbon is prepared.

[0116] The pyrolysis furnace 7 further pyrolyzes and converts the biomass particles that may be incompletely gasified in the synthesis gas mixture output by the gasification furnace 5, which is conducive to more fully utilizing the carbonaceous components in these particles, and the pyrolysis furnace 7 can also crack the tar and methane and other heavy hydrocarbons in the synthesis gas to generate more small molecule gases such as carbon monoxide (CO) and hydrogen (H2), which are important raw materials for subsequent methanol synthesis. At the same time, the cracking of tar also reduces the plugging and corrosion problems that may be encountered in the subsequent treatment process.

[0117] The activation device 16 collects the first water vapor from the first heat recovery device 8, which not only realizes efficient utilization of energy, but also uses the water vapor as the activation gas for activating the fly ash solid waste. Even if the supply of CO2 is problematic, the water vapor can be supplemented in time, which is conducive to the continuity and stability of the activation reaction.

[0118] In some specific embodiments, the synthesis gas shift device 12 is also connected with a second heat recovery device 18, and the second heat recovery device 18 is used to recover the heat of the synthesis gas shift device 12 to gasify the liquid water in the second heat recovery device 18 into second water vapor;

[0119] The second water vapor generated by the second heat recovery device 18 is collected by the activation device 16, wherein the second water vapor is used as the activation gas for activating the fly ash, and activated carbon is prepared.

[0120] The reaction formula of the activation reaction of the fly ash solid waste with the first water vapor or the second vapor as the active gas is as follows:

[0121] C+H2O→2CO.

[0122] The activation device 16 collects the second water vapor from the second heat recovery device 18 and uses it as the active gas for the activation treatment of the fly ash solid waste, similar to the first water vapor, so that the water vapor can be supplemented in time even if the supply of CO2 is problematic, and the continuity and stability of the activation reaction are beneficial.

[0123] The activation device 16 in the application can simultaneously receive the water vapor generated from the first heat recovery device 8 and the second heat recovery device 18, and the comprehensive utilization method of the waste gas and solid waste of the biomass gasification methanol disclosed in the application not only can more comprehensively recover and utilize the waste heat generated in the production process, but also can fully utilize the energy generated in the preparation process of the biomass gasification methanol cogeneration activated carbon system for multi-stage utilization and deep utilization of resources, thereby reducing the demand for external energy in the comprehensive utilization process of the waste gas and solid waste of the biomass gasification methanol, reducing the energy consumption and cost in the production process, reducing the treatment cost of the waste gas and solid waste in the production process while comprehensively utilizing the waste gas and solid waste resources, improving the core competitiveness of the biomass methanol, and promoting the energy saving and emission reduction and green development of the biomass methanol industry.

[0124] Although the application has been described with reference to several exemplary embodiments, it should be understood that the terms used are terms of description and illustration and not of limitation. Since the application can be embodied in various forms without departing from the spirit or essential characteristics thereof, it should be understood that the above-described embodiments are not limited to any of the aforementioned details, but are to be broadly interpreted within the spirit and scope of the appended claims, and all changes and modifications that fall within the meaning and range of equivalents of the claims are intended to be embraced thereby.

Claims

1. A system for comprehensive utilization of waste gas and solid waste from biomass gasification methanol production, characterized in that, The system comprises: a gasifier for gasifying biomass to obtain a synthesis gas mixture; a dust removal device connected to a gas outlet of the gasifier, the dust removal device being provided with a first outlet and a second outlet, the dust removal device being configured to receive the synthesis gas mixture and separate fly ash solid waste from the synthesis gas mixture, the first outlet being configured to discharge the separated synthesis gas mixture, and the second outlet being configured to discharge the fly ash solid waste; a synthesis gas shift device connected to the first outlet of the dust removal device, the synthesis gas shift device being configured to perform a carbon monoxide shift reaction on the separated synthesis gas mixture to obtain a synthesis shift gas, the synthesis shift gas comprising carbon monoxide, carbon dioxide and hydrogen; a decarbonization device configured to remove part of the carbon dioxide in the synthesis shift gas to form a carbon dioxide waste gas and a synthesis reaction gas containing carbon dioxide; a methanol synthesis device connected to a gas outlet of the decarbonization device, the methanol synthesis device being configured to receive the synthesis reaction gas containing carbon dioxide and perform a methanol synthesis reaction to obtain methanol; an activation device connected to the second outlet to receive the fly ash solid waste, the activation device being connected to the decarbonization device to receive the carbon dioxide waste gas, the activation device being configured to perform an activation reaction on the fly ash solid waste to obtain activated carbon.

2. The system according to claim 1, wherein, The activation reaction of the activation device is performed at a temperature of 800-1000°C for 2.5-3.5 hours, and the activated carbon has an iodine adsorption value greater than 600 mg / g and a methylene blue adsorption value greater than 120 mg / g.

3. The system according to claim 1, wherein a cracking furnace is further provided between the gasifier and the dust removal device, the cracking furnace being configured to further gasify biomass particles mixed in the synthesis gas mixture and crack tar and methane in the synthesis gas mixture, the cracking furnace being provided with an ash outlet configured to discharge ash generated by the cracking furnace.

4. The system according to claim 3, further comprising a first heat recovery device provided between the cracking furnace and the dust removal device, a gas inlet of the first heat recovery device being connected to the cracking furnace, a gas outlet of the first heat recovery device being connected to the dust removal device, the first heat recovery device being configured to vaporize liquid water in the first heat recovery device into first steam using heat of the cracking furnace, and an exhaust port of the first heat recovery device being connected to the activation device to allow the first steam to flow into the activation device and perform an activation reaction with the fly ash solid waste. Further comprising: ​ 5. The system according to claim 4, wherein the system is characterized by: ​ A rapping device is arranged on the first heat recovery device, the first heat recovery device is provided with a communication pipeline which communicates the gasification furnace and the dust removal equipment, the rapping device can apply force to the communication pipeline to make the fly ash solid waste deposited in the communication pipeline fall off, and the first heat recovery device is further provided with a third outlet which communicates with the activation device to recover the fly ash solid waste in the first heat recovery device; A cooling device is connected between the third outlet of the first heat recovery device and the activation device, and the cooling device can reduce the temperature of the fly ash solid waste.

6. The system according to claim 5, wherein the system is characterized by: Further comprising: A first conveying device is arranged between the third outlet of the first heat recovery device and the activation device, and the first conveying device can convey a first inert gas with a preset flow rate to the pipeline between the first heat recovery device and the activation device to convey the fly ash solid waste to the activation device; A second conveying device is arranged between the second outlet of the dust removal equipment and the activation device, and the second conveying device can convey a second inert gas with a preset flow rate to the pipeline between the second outlet of the dust removal equipment and the activation device to convey the fly ash solid waste to the activation device.

7. The waste gas and solid waste comprehensive utilization system for biomass gasification and methanol production according to claim 3, further comprising a separation device arranged between the gasification furnace and the cracking furnace, a feeding end of the separation device being connected with the gasification furnace, and an exhaust port of the separation device being connected with the cracking furnace, the separation device being used for solid-gas separation of the synthesis gas mixture.

8. The waste gas and solid waste comprehensive utilization system for biomass gasification and methanol production according to claim 7, further comprising a material returning device arranged between the separation device and the gasification furnace, the solid-gas separated solid material of the synthesis gas mixture including unreacted biomass, and the material returning device being used for conveying the unreacted biomass to the gasification furnace.

9. The waste gas and solid waste comprehensive utilization system for biomass gasification and methanol production according to claim 1, further comprising a second heat recovery device connected with the synthesis gas shift device, the second heat recovery device being used for vaporizing liquid water in the second heat recovery device into second water vapor by using heat of the synthesis gas shift device, and an exhaust port of the second heat recovery device being connected with the activation device to make the second water vapor flow into the activation device and react with the fly ash.

10. The waste gas and solid waste comprehensive utilization system for biomass gasification and methanol production according to claim 1 or 9, further comprising a dryer connected with an outlet of the activation device, the dryer being used for drying activated carbon generated by the activation device, and water content of the activated carbon at the outlet of the dryer being less than 10%; and / or a desulfurization tower arranged between the synthesis gas shift device and the decarburization device, the desulfurization tower being used for removing sulfur dioxide in the synthesis shift gas; and / or ​ ​ ​ ​ ​ The decarburization device comprises a decarburization tower and a regeneration tower, the decarburization tower is connected between the syngas shift device and the regeneration tower, and is used for adsorbing carbon dioxide waste gas in the syngas shift gas; the regeneration tower is connected between the decarburization tower and the activation device, and is used for conveying carbon dioxide waste gas to the activation device; A water washing tower is arranged between the dust removal device and the syngas shift device, and is used for removing tar in the syngas mixture; and / or A compression device is arranged between the dust removal device and the syngas shift device, and is used for pressurizing the syngas mixture.

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