Raw material gasification system and raw material gasification method

Abstract

The invention discloses a raw material gasification system and a raw material gasification method, and relates to the technical field of biomass gasification, the raw material gasification system comprises a temperature control device, and a feeding device, a gasification device and a gasified gas treatment unit which are communicated in sequence, the temperature control device comprises a gasification agent conveying pipeline, a first conveying pipeline and a second conveying pipeline, the first conveying pipeline and the second conveying pipeline are respectively communicated with the gasifying agent conveying pipeline through a first regulating valve group and a second regulating valve group, and a plurality of fixed air caps communicated with the first conveying pipeline and flexible air caps communicated with the second conveying pipeline are arranged in the gasifying device; the gasifying agent conveying pipeline is provided with a regulating valve group for regulating the total gasifying agent amount and the gasifying agent proportion; according to the invention, the temperature and workload of the gasification device can be controlled by the temperature control device according to the characteristics of gasified raw materials, the problems of coking and fluidization loss of the hearth are avoided, and the gasification efficiency and the applicability of the raw materials are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass gasification, and in particular to a raw material gasification system and a raw material gasification method. Background Art

[0002] As the most promising renewable energy, biomass has become the fourth largest energy source. Compared with traditional energy sources such as coal, oil and natural gas, it has great development potential. my country's biomass resources are mainly various types of residues and wastes (passive biomass resources), mainly including agricultural waste, forestry waste, livestock and poultry manure, domestic garbage, sewage sludge, etc. The main ways of utilizing biomass energy in my country include power generation, preparation of molded fuels and production of gas. However, with the rapid development of other new energy sources, the application prospects of using biomass energy as raw materials to produce liquid fuels or chemical products are becoming increasingly clear, and biomass gasification technology is its leading industry and a key technology for achieving clean and efficient utilization of biomass.

[0003] Similar to the mature coal gasification technology, biomass gasification technology is currently divided into three categories: fixed bed, fluidized bed, and entrained bed according to the flow state of the material in the gasifier. However, due to the physical and chemical properties of biomass such as low grindability index, high sodium and potassium, high water content, low ash content, low ash melting point, low ignition point, oil content, special viscosity-temperature characteristics, and poor slurryability, coal gasification equipment is not directly used for biomass gasification. Fixed-bed biomass gasification equipment has the advantages of simple process, convenient operation, and low investment, but generally has disadvantages such as small processing volume, low conversion rate, poor environmental protection, and high raw material requirements, which are not conducive to the clean and efficient use of biomass gasification technology. Entrained bed biomass gasification technology has the advantages of high conversion rate, good environmental protection, large processing volume, and high degree of automation, but due to the poor slurryability of biomass raw materials, low grindability index, low ignition point, and special viscosity-temperature characteristics, the air flow Bed gasification cannot directly utilize biomass and requires pre-carbonization of biomass raw materials, resulting in waste of raw material resources, high raw material pretreatment costs, low energy utilization rate and other disadvantages. In addition, the characteristics of high pressure and large-scale fluidized bed gasification technology will lead to increased collection costs, low scale matching, and poor operating economy for biomass with relatively dispersed resource distribution. Compared with fixed bed and fluidized bed gasification technologies, fluidized bed biomass gasification technology has the advantages of low raw material requirements, moderate scale, good environmental protection indicators, and high energy utilization rate, making it more competitive. However, due to the low ash melting point of biomass, the existing fluidized bed gasification technology has a low bed temperature control to prevent coking in the furnace, low carbon conversion rate, and poor raw material adaptability. At the same time, due to the high volatile matter and low ash characteristics of biomass, some fluidized bed gasification technologies also require additional bed materials, and the system process is complicated.

[0004] Therefore, people are in urgent need of a raw material gasification system that can adjust the temperature, improve the gasification efficiency and the adaptability of raw materials. Summary of the invention

[0005] The purpose of the present invention is to provide a raw material gasification system and a raw material gasification method to solve the problems existing in the above-mentioned prior art, avoid the problem of furnace coking and defluidization by regulating the temperature and workload of the gasification device, and improve the gasification efficiency and raw material applicability.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a raw material gasification system, comprising a feeding device, a gasification device, a temperature control device for controlling the temperature of the gasification device and a gasification gas processing unit, the raw material outlet of the feeding device is connected with the raw material inlet of the gasification device, the gasification gas outlet of the gasification device is connected with the gasification gas inlet of the gasification gas processing unit, the temperature control device comprises a gasification agent delivery pipeline, a first delivery pipeline and a second delivery pipeline, the first delivery pipeline and the second delivery pipeline are respectively connected to the gasification agent delivery pipeline through a first regulating valve group and a second regulating valve group, a plurality of fixed wind hoods and flexible wind hoods are arranged in the gasification device, the flexible wind hood is connected with the second delivery pipeline, the fixed wind hood is connected with the first delivery pipeline, and the gasification agent delivery pipeline is provided with a regulating valve group for adjusting the total gasification amount and the gasification agent ratio.

[0007] Preferably, the temperature control device also includes a protective gas delivery pipeline, which is connected to the second delivery pipeline through a third regulating valve group; an air distribution disk is provided at the bottom of the gasification device, and a plurality of the fixed wind hoods and the flexible wind hoods are provided on the air distribution disk.

[0008] Preferably, the gasification gas processing unit comprises a dust removal device for removing dust from the gasification gas, and the gasification gas outlet of the gasification device is connected to the dust removal device.

[0009] Preferably, a gas-solid separation device is arranged between the gasification device and the gasification gas treatment unit, the air inlet of the gas-solid separation device is connected to the gasification gas outlet of the gasification device, the air outlet of the gas-solid separation device is connected to the gasification gas inlet of the gasification gas treatment unit, and the solid outlet of the gas-solid separation device is connected to the return port of the gasification device through a return device.

[0010] Preferably, the gasification gas processing unit includes a steam generating device, a steam superheating device and a steam-water separation device, the gasification gas inlet of the steam generating device is connected to the gasification gas outlet of the gasification device, the water inlet of the steam generating device is connected to the water outlet of the steam-water separation device, the steam-water mixture outlet of the steam generating device is connected to the steam-water mixture inlet of the steam-water separation device, the steam-water separation device is provided with a water replenishment port, the steam outlet of the steam-water separation device is connected to the steam inlet of the steam superheating device, the gasification gas inlet of the steam superheating device is connected to the gasification gas outlet of the steam generating device, the steam outlet of the steam superheating device is connected to an external steam supply pipeline, and the steam generating device and the steam superheating device utilize waste heat of the gasification gas to generate steam.

[0011] Preferably, the steam outlet of the steam superheating device and the oxygen supply pipeline are in communication with the gasifying agent inlet of the gasifying device.

[0012] Preferably, the coarse slag outlet of the gasification device is connected to the coarse slag cooling device.

[0013] Preferably, the raw material gasification system also includes a deoxygenation device and a desalted water pipeline that provides a cooling medium for the coarse slag cooling device; the desalted water outlet of the coarse slag cooling device is connected to the desalted water inlet of the deoxygenation device; the steam outlet of the steam-water separation device is connected to the steam inlet of the deoxygenation device; and the water outlet of the deoxygenation device is connected to the water replenishment port of the steam-water separation device.

[0014] Preferably, the feeding device includes a bucket elevator, a belt conveyor, a raw material bin and a screw conveyor connected in sequence, the raw material outlet of the screw conveyor is connected to the raw material inlet of the gasification device, the raw material inlet of the bucket elevator is connected to a temporary storage and pretreatment device, and the temporary storage and pretreatment device is connected to a raw material forming device for crushing and briquetting the raw materials.

[0015] The present invention also provides a raw material gasification method using the raw material gasification system, comprising the following steps: S1: The raw material enters the gasification device through the feeding device and undergoes a gasification reaction with the gasifying agent; S2: The gasified gas produced by the gasification device enters the gasified gas treatment unit for treatment; S3: According to the properties of the raw materials in the gasification device, the temperature and the workload of the gasification device are adjusted by the temperature control device.

[0016] Compared with the prior art, the present invention mainly achieves the following technical effects: The temperature and workload of the gasification device can be controlled by a temperature control device according to the characteristics of the gasified raw materials, thereby avoiding the problem of coking and defluidization in the furnace and improving the gasification efficiency and raw material applicability.

[0017] Compared with the prior art, other solutions of the present invention have achieved the following technical effects: The air distribution method of combining a fixed air hood connected to the first conveying pipeline and a flexible air hood connected to the second conveying pipeline can adapt to the adjustment of different raw materials and different loads.

[0018] The waste heat of gasification gas is fully utilized to produce by-product steam, which can be used for the system itself and also supplied to other parties. At the same time, the waste heat of the produced coarse slag is recovered to heat the desalted water for water replenishment in the deaerator, thus saving the consumption of deaerator steam and improving the thermal efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A system diagram of a raw material gasification system in an embodiment of the present invention; Figure 2 is a gasification flow chart of a raw material gasification method in an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the air distribution disk in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a temperature control device in an embodiment of the present invention; Figure 5 A top view of the layout of the flow distribution pipes in the steam generating device according to an embodiment of the present invention; Among them, 1. Raw material forming device; 2. Temporary storage and pretreatment device; 3. Feeding device; 301. Bucket elevator; 302. Belt conveyor; 303. Raw material bin; 304. Screw conveyor; 4. Gasification device; 401. Flexible wind hood; 402. Fixed wind hood; 403. Air distribution disk; 5. Gas-solid separation device; 6. Return device; 7. Coarse slag cooling device; 8. Dust removal device; 9. Temperature control device; 901. First regulating valve group; 902. Second regulating valve group; 903. Third regulating valve group; 10. Steam-water separation device; 11. Deoxygenation device; 12. Steam generating device; 1201. Diverter pipe; 13. Steam superheating device. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a raw material gasification system and a raw material gasification method to solve the problems existing in the prior art, avoid the problem of furnace coking and defluidization by regulating the temperature and workload of the gasification device, and improve the gasification efficiency and raw material applicability.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figures 1 to 5 As shown, a raw material gasification system is provided, including a feeding device 3, a gasification device 4, a temperature control device 9 for controlling the temperature of the gasification device 4, and a gasification gas processing unit. The raw material outlet of the feeding device 3 is connected to the raw material inlet of the gasification device 4, and the gasification gas outlet of the gasification device 4 is connected to the gasification gas inlet of the gasification gas processing unit. The system can use the temperature control device 9 to control the temperature and workload of the gasification device 4 according to the characteristics of the gasified raw materials, avoid the problem of coking and defluidization in the furnace, and improve the gasification efficiency and raw material applicability.

[0025] In this embodiment, the gasification device 4 uses a circulating fluidized bed, and the fluidized bed gasification furnace uses a refractory lining.

[0026] In this embodiment, the gasification device 4 may be provided with a plurality of raw material inlets, and the plurality of raw materials are evenly distributed along the circumferential direction to improve the uniformity of the feed.

[0027] In this embodiment, the temperature control device 9 includes a gasification agent delivery pipeline, a protective gas delivery pipeline, a first delivery pipeline and a second delivery pipeline. The first delivery pipeline and the second delivery pipeline are respectively connected to the gasification agent delivery pipeline through the first regulating valve group 901 and the second regulating valve group 902, the protective gas delivery pipeline is connected to the second delivery pipeline through the third regulating valve group 903, and the first delivery pipeline and the second delivery pipeline are respectively connected to the gasification device 4; the gasification device 4 is provided with an air distribution plate 403 at the bottom, and a plurality of fixed air hoods 402 and flexible air hoods 401 are provided on the air distribution plate 403. The fixed air hoods 402 and the flexible air hoods 401 are evenly distributed, and the flexible air hoods 402 and 401 are evenly distributed. 1 is connected to the second delivery pipeline, and the fixed wind cap 402 is connected to the first delivery pipeline. The gasifying agent delivery pipeline is provided with a regulating valve group for adjusting the total gasifying agent dosage and the ratio of gasifying agent steam to oxygen. The regulating valve group includes two flow regulating valves, which are respectively arranged on the oxygen pipeline and the steam pipeline connected to the gasifying agent delivery pipeline, and a flow meter can be additionally arranged to obtain the flow of oxygen and steam; in this embodiment, the number of flexible wind caps 401 is less than the number of fixed wind caps 402. The temperature control principle of the temperature control device 9 in this embodiment is: when the type of raw material changes or the load of the gasifier changes, it is necessary to control the gasification temperature by adjusting the gasifying agent dosage. At this time, by adjusting The regulating valve group on the gasifier conveying pipeline regulates the total gasifier dosage and adjusts the ratio of oxygen to steam of the gasifier as needed (when the gasification load remains unchanged and the raw material ash melting point changes, the gasification temperature needs to be changed, and the total gasifier dosage needs to be changed at this time; when the raw material type remains unchanged and the gasification load increases or decreases, the total gasifier dosage needs to be increased or decreased). Based on the change in the total gasifier dosage, the first regulating valve group 901 and the second regulating valve group 902 need to regulate the conveying ratio of the first conveying pipeline and the second conveying pipeline according to the change in the total gasifier dosage, that is, to regulate the ratio of the gas delivery volume of the flexible hood 401 and the fixed hood 402 to the total gasifier dosage, so that the gas delivery volume of the first conveying pipeline is less than the total gasifier dosage. The gas volume entering the fixed wind hood 402 is the same as or similar to the gas volume under normal working conditions, ensuring that the flow rate of the fixed wind hood 402 is relatively stable, thereby ensuring the fluidization effect and the bed pressure drop; for example: the total gasification amount is set to be divided into 10 portions, the proportion of gasification agent delivered by the flexible wind hood 401 is 40%, and the proportion of gasification agent delivered by the fixed wind hood 402 is 60%. At this time, the flexible wind hood 401 outputs 4 portions, and the fixed wind hood 402 outputs 6 portions. When the total gasification amount changes to 6 portions, the proportion of gasification agent delivered by the flexible wind hood 401 is 0%, and the proportion of gasification agent delivered by the fixed wind hood 402 is 100%, that is, the flexible wind hood 401 outputs 0 portions, and the fixed wind hood 402 outputs 6 portions;The function of the third regulating valve group 903 is to prevent the gas in the gasification device 4 from flowing back to the second delivery pipeline by supplying protective gas to the flexible air cap 401 when there is no gasification agent delivered to the flexible air cap 401. That is, when the amount of gasification agent delivered to the flexible air cap 401 is 0, the third regulating valve group 903 is opened to allow protective gas to enter. The protective gas can be selected from one or more of steam, carbon dioxide, and nitrogen. ;

[0028] In this embodiment, the reaction temperature, circulation ratio, fluidization speed and other process parameters of the gasification device 4 can be adjusted by adjusting each group of valves.

[0029] In this embodiment, the flexible hoods 401 account for 20% to 40% of the total number of hoods.

[0030] Since fly ash is produced during the gasification process, the gasification gas processing unit includes a dust removal device 8 for removing dust from the gasification gas. The gasification gas outlet of the gasification device 4 is connected to the dust removal device 8. The dust removal device 8 is used to output the purified gasification gas and fly ash respectively. The fly ash can be transported and processed through external transportation equipment. The fly ash can be used as a raw material for carbon-based fertilizer and returned to the field for resource utilization. In this embodiment, the dust removal device 8 uses a metal filter or a ceramic filter, dry dust removal, high dust removal efficiency, no washing black water in the system, the outlet gasification gas composition is simple, and the system is environmentally friendly.

[0031] Since the gasified gas produced by the gasification device 4 will contain some unreacted raw materials, a gas-solid separation device 5 is arranged between the gasification device 4 and the gasification gas processing unit for separating the raw materials and the gasified gas. The air inlet of the gas-solid separation device 5 is connected to the gasification gas outlet of the gasification device 4, and the air outlet of the gas-solid separation device 5 is connected to the gasification gas inlet of the gasification gas processing unit. The solid outlet of the gas-solid separation device 5 is connected to the return port of the gasification device 4 through the return device 6. The return device 6 is used to provide a path for the separated raw materials to return to the gasification device 4, so as to improve the processing effect of the raw materials. In this embodiment, a control mechanism that can adjust the flow area and the conveying flow rate is arranged in the return device 6. For example, the return device 6 is a pipeline, and a corresponding valve body is arranged on the pipeline to control the flow area and the conveying flow rate.

[0032] Since the gasified gas produced by the gasification device 4 has a high heat content, direct discharge will cause heat loss. Therefore, the gasified gas processing unit in this embodiment additionally includes a steam generating device 12, a steam superheating device 13 and a steam-water separation device 10. The gasified gas inlet of the steam generating device 12 is connected to the gasified gas outlet of the gasification device 4, the water inlet of the steam generating device 12 is connected to the water outlet of the steam-water separation device 10, the steam-water mixture outlet of the steam generating device 12 is connected to the steam-water mixture inlet of the steam-water separation device 10, and the steam-water separation device 10 is connected to the steam-water mixture outlet of the steam generating device 12. The device 10 is provided with a water replenishment port, the steam outlet of the steam-water separation device 10 is connected with the steam inlet of the steam superheating device 13, the gasification gas inlet of the steam superheating device 13 is connected with the gasification gas outlet of the steam generating device 12, the gasification gas outlet of the steam superheating device 13 is connected with the dust removal device 8, the steam outlet of the steam superheating device 13 is connected with the steam external supply pipeline, the steam generating device 12 and the steam superheating device 13 use the waste heat of the gasification gas to generate steam, and the steam can be supplied to the external equipment that needs to use the steam, so as to realize the recovery and reuse of the waste heat.

[0033] The steam generating device 12 and the steam superheating device 13 can reduce the temperature of the gasified gas to below the gasification temperature of the alkali metal and its oxide or salt, thereby avoiding problems such as slagging and corrosion of subsequent system equipment.

[0034] In order to improve the heat exchange effect of the steam generating device 12, the steam generating device 12 includes a plurality of diverter pipes 1201 vertically arranged and connected to the gasification gas inlet. The plurality of diverter pipes 1201 surround to form a plurality of mutually nested cylindrical structures. The diverter pipes 1201 in a single cylindrical structure are welded by fins to form a complete cylinder. The water inlet of the steam-water separation device 10 is supplied into the cylinder, and the heat exchange area is large.

[0035] In this embodiment, the gasifying agent is a mixture of oxygen and steam. On the basis of utilizing the waste heat of the gasified gas to generate steam, the steam outlet of the steam superheating device 13 and the oxygen supply pipeline can be arranged to be connected to the gasifying agent inlet of the gasifying device 4. When the temperature control device 9 is arranged as the above-mentioned conveying pipeline, valve group and wind cap, the steam outlet of the steam superheating device 13 and the oxygen supply pipeline are connected to the gasifying agent conveying pipeline, which is equivalent to being indirectly connected to the gasifying agent inlet of the gasifying device 4 through the temperature control device 9; the part of the steam pipeline connected to the oxygen supply pipeline is arranged in parallel with the pipeline for steam output to the outside, that is, the produced steam is used for self-use and external supply is realized at the same time.

[0036] The coarse slag outlet of the gasification device 4 is connected to the coarse slag cooling device 7, which is used to cool the coarse slag. The cooled coarse slag can be used as a raw material for carbon-based fertilizer and returned to the field for resource utilization. The coarse slag cooling device 7 is a spiral water-cooled structure designed with a central cooling channel and an external water-cooling jacket.

[0037] In order to make full use of the waste heat resources during the cooling of the coarse slag, the raw material gasification system also includes a deoxygenator 11 and a desalted water pipeline that provides a cooling medium for the coarse slag cooling device 7. The desalted water outlet of the coarse slag cooling device 7 is connected to the desalted water inlet of the deoxygenator 11, and desalted water with a certain temperature is added to the deoxygenator 11. When the added desalted water has a certain temperature, the steam outlet of the steam-water separation device 10 can be connected to the steam inlet of the deoxygenator 11 through a branch pipeline, and there is no need to supply superheated steam to the deoxygenator 11. The water outlet of the deoxygenator 11 is connected to the water replenishment port of the steam-water separation device 10, and the deoxygenated desalted water is used as replenishment water for the steam-water separation device 10 to be replenished to the steam-water separation device 10.

[0038] The feeding device 3 includes a bucket elevator 301, a belt conveyor 302, a raw material bin 303 and a screw conveyor 304 connected in sequence. The raw material outlet of the screw conveyor 304 is connected to the raw material inlet of the gasification device 4. The raw material inlet of the bucket elevator 301 is connected to the temporary storage and pretreatment device 2. The temporary storage and pretreatment device 2 is connected to the raw material forming device 1 for crushing and briquetting the raw material. The raw material forming device 1 includes a crusher and a briquetting machine, which crush and briquette the irregular raw materials with low bulk density and large size in sequence, and process the biomass raw materials. After crushing and briquetting, the raw materials are fed into the temporary storage and pretreatment device 2. The temporary storage and pretreatment device 2 is additionally provided with a raw material inlet for feeding in raw materials that only need to be simply crushed. The raw materials that only need to be simply crushed are powder materials with qualified bulk density. A crusher is arranged on the raw material inlet path; the bucket elevator 301, the belt conveyor 302, the raw material bin 303 and the screw conveyor 304 are used for conveying, metering and feeding the raw materials in the temporary storage and pretreatment device 2; in other embodiments, the feeding device 3 can also select other equipment with conveying function.

[0039] In this embodiment, the raw materials entering the raw material forming device 1 and the temporary storage and pretreatment device 2 enter the gasification treatment device, and the temperature range of the gasification treatment is 700~900℃; the temperature of the desalted water after the coarse slag is cooled is 50~80℃; the temperature of the coarse slag after cooling is <100℃; the temperature of the gasified gas after heat exchange by the steam superheating device 13 is 250~400℃; the steam pressure range of the steam-water separation device 10 is 0.3~4.0MpaG; the final external steam temperature range is 250~450℃; the fly ash collection rate of the dust removal device 8 is ≥99%, and the dust content of the obtained gasification gas is ≤10mg / Nm³; the load adjustment range of this system is 50%~110%, and the carbon conversion rate is ≥90%.

[0040] The raw material received by the feeding device 3 can be in various forms such as blocks, sheets, strips, columns, particles, etc.

[0041] This system can process a variety of different raw materials simultaneously.

[0042] This system has low requirements for raw materials entering the furnace, and has no requirements for thermal stability, viscosity-temperature characteristics, and transportation characteristics. It does not require the addition of binders or pre-carbonization, and the cost of raw material pretreatment is low.

[0043] The present invention also provides a raw material gasification method using the raw material gasification system, comprising the following steps: S1: The first raw material enters the raw material forming device 1, and is crushed and briquette-pressed to obtain a molding material with a qualified particle size and bulk density; the second raw material enters the temporary storage and pretreatment device 2, and is crushed and mixed with the molding material to form a third raw material; the third raw material enters the temporary storage box through the bucket elevator 301 and the belt conveyor 302, and the raw material in the temporary storage box is defined as the fourth raw material, which is conveyed to the gasification device 4 through the screw conveyor 304. After entering the gasification device 4, the fourth raw material reacts with the first gasifying agent supplied by the temperature control device 9 through the fixed hood 402 and the flexible hood 401 to produce a first coarse slag and a first gasification gas, and the first coarse slag is cooled by the coarse slag cooling device 7 and then conveyed as the second coarse slag; S2: The first gasification gas passes through the gas-solid separation device 5 to form the second gasification gas and the first return material. The first return material passes through the return material device 6 and returns to the gasification device 4 as the second return material. The second gasification gas enters the gasification gas processing unit. S3: According to the properties of the raw materials in the gasification device 4, the temperature and the workload of the gasification device 4 are adjusted by the temperature control device 9; S4: The second gasification gas is supplied to the steam generating device 12, and the inlet water of the steam-water separation device 10 is heated to generate a steam-water mixture which is further supplied to the steam-water separation device 10. The second gasification gas after heat exchange enters the steam superheating device 13 as the third gasification gas. The third gasification gas heats the first steam separated by the steam-water separation device 10 in the steam superheating device 13 to form second steam. The third gasification gas after heat exchange is supplied to the dust removal device 8 as the fourth gasification gas to generate the fifth gasification gas and fly ash. The fifth gasification gas is used as a raw material gas for synthesizing methanol, ammonia, etc. for high-value utilization.

[0044] In step S4, part of the second steam is mixed with the first oxygen as the third steam and enters the gasification agent conveying pipeline of the temperature control device 9 as the first gasification agent, and part of the second steam is directly supplied to the outside as the fourth steam, for example, it is used as a gas source for steam turbine power generation or industrial traction; part of the first steam is supplied to the deaerator 11 as the fifth steam, and the first desalted water is supplied to the deaerator 11 as the second desalted water after the coarse slag is cooled. The deaerator 11 can be additionally provided with a desalted water supply pipeline for direct water replenishment, and the output water of the deaerator 11 enters the steam-water separation device 10 as the first replenishment water.

[0045] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0046] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A raw material gasification system, characterized in that: It includes a feeding device, a gasification device, a temperature control device for controlling the temperature of the gasification device and a gasification gas processing unit. The raw material outlet of the feeding device is connected to the raw material inlet of the gasification device, and the gasification gas outlet of the gasification device is connected to the gasification gas inlet of the gasification gas processing unit. The temperature control device includes a gasification agent delivery pipeline, a first delivery pipeline and a second delivery pipeline. The first delivery pipeline and the second delivery pipeline are connected to the gasification agent delivery pipeline through a first regulating valve group and a second regulating valve group respectively. A plurality of fixed wind hoods and flexible wind hoods are arranged in the gasification device. The flexible wind hood is connected to the second delivery pipeline, and the fixed wind hood is connected to the first delivery pipeline. The gasification agent delivery pipeline is provided with a regulating valve group for adjusting the total gasification amount and the gasification agent ratio.

2. The raw material gasification system according to claim 1, characterized in that: The temperature control device also includes a protective gas delivery pipeline, which is connected to the second delivery pipeline through a third regulating valve group; an air distribution disk is arranged at the bottom of the gasification device, and a plurality of the fixed wind hoods and the flexible wind hoods are arranged on the air distribution disk.

3. The raw material gasification system according to claim 1, characterized in that: The gasification gas processing unit comprises a dust removal device for removing dust from the gasification gas, and the gasification gas outlet of the gasification device is communicated with the dust removal device.

4. The raw material gasification system according to claim 1, characterized in that: A gas-solid separation device is arranged between the gasification device and the gasification gas treatment unit, the air inlet of the gas-solid separation device is connected to the gasification gas outlet of the gasification device, the air outlet of the gas-solid separation device is connected to the gasification gas inlet of the gasification gas treatment unit, and the solid outlet of the gas-solid separation device is connected to the return port of the gasification device through a return device.

5. The raw material gasification system according to claim 1, characterized in that: The gasification gas processing unit includes a steam generating device, a steam superheating device and a steam-water separation device. The gasification gas inlet of the steam generating device is communicated with the gasification gas outlet of the gasification device, the water inlet of the steam generating device is communicated with the water outlet of the steam-water separation device, the steam-water mixture outlet of the steam generating device is communicated with the steam-water mixture inlet of the steam-water separation device, the steam-water separation device is provided with a water replenishment port, the steam outlet of the steam-water separation device is communicated with the steam inlet of the steam superheating device, the gasification gas inlet of the steam superheating device is communicated with the gasification gas outlet of the steam generating device, the steam outlet of the steam superheating device is communicated with an external steam supply pipeline, and the steam generating device and the steam superheating device generate steam using waste heat of the gasification gas.

6. The raw material gasification system according to claim 5, characterized in that: The steam outlet of the steam superheating device and the oxygen supply pipeline are in communication with the gasifying agent inlet of the gasifying device.

7. The raw material gasification system according to claim 5, characterized in that: The coarse slag outlet of the gasification device is communicated with the coarse slag cooling device.

8. The raw material gasification system according to claim 7, characterized in that: The raw material gasification system also includes a deoxygenation device and a desalted water pipeline that provides a cooling medium for the coarse slag cooling device. The desalted water outlet of the coarse slag cooling device is connected to the desalted water inlet of the deoxygenation device, the steam outlet of the steam-water separation device is connected to the steam inlet of the deoxygenation device, and the water outlet of the deoxygenation device is connected to the water replenishment port of the steam-water separation device.

9. The raw material gasification system according to claim 1, characterized in that: The feeding device includes a bucket elevator, a belt conveyor, a raw material bin and a screw conveyor connected in sequence, the raw material outlet of the screw conveyor is connected to the raw material inlet of the gasification device, the raw material inlet of the bucket elevator is connected to a temporary storage and pretreatment device, and the temporary storage and pretreatment device is connected to a raw material forming device for crushing and briquetting the raw materials.

10. A method for gasifying raw materials, characterized in that: The raw material gasification system according to any one of claims 1 to 9 comprises the following steps: S1: The raw material enters the gasification device through the feeding device and undergoes a gasification reaction with the gasifying agent; S2: The gasified gas produced by the gasification device enters the gasified gas treatment unit for treatment; S3: According to the properties of the raw materials in the gasification device, the temperature and the workload of the gasification device are adjusted by the temperature control device.

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