A biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system and method

Abstract

The invention discloses a biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system and method, belonging to the technical field of boiler co-combustion. The system comprises a biomass and oil sludge pretreatment system, a synthesis gas system and a circulating fluidized bed system; the biomass and oil sludge pretreatment system is connected to the circulating fluidized bed system; the first biomass and oil sludge particles processed by the biomass and oil sludge pretreatment system are mixed with coal and enter the circulating fluidized bed system for combustion; the biomass and oil sludge pretreatment system is connected to the synthesis gas system, and the synthesis gas system is connected to the circulating fluidized bed system; the second biomass and the second oil sludge processed by the biomass and oil sludge pretreatment system are mixed in the synthesis gas system to generate synthesis gas and oil sludge biomass charcoal; the synthesis gas enters the circulating fluidized bed system for gas supply, and the oil sludge biomass charcoal enters the circulating fluidized bed system for removing organic pollutants. The system improves combustion efficiency, reduces pollutant emissions, and reduces energy loss.

Description

Technical Field

[0001] The invention relates to the technical field of boiler co-firing, and more specifically to a biomass and oil sludge pretreatment and circulating fluidized bed co-firing coupling system and method. Background Art

[0002] Oil sludge is a kind of oily sludge solid waste produced in the oil and gas field development industry. At present, the annual production of oil sludge in my country has exceeded 3×10 6 t. Oil sludge has high moisture and ash content, and its combustible components are mainly crude oil volatiles. The harmlessness, cleaning and recycling of oil sludge has become one of the focuses of environmental protection and the petroleum industry at home and abroad. As a carbon-neutral and renewable energy source, the consumption of biomass energy is increasing year by year. Using biomass to partially replace fossil energy can reduce excessive dependence on fossil fuels and reduce SO x and NO x and smoke and other pollutants, lower the ignition point, and increase the reactivity of coal. Combustion and gasification are ways to directly and indirectly utilize fuels. Combustion has outstanding advantages such as fast processing speed, high degree of reduction, and resource recycling. However, sludge will produce toxic substances such as dioxins during the combustion process. Gasification technology is a clean energy utilization method that uses gasifiers such as air, oxygen, and water vapor to convert hydrocarbons in fuel into high-grade synthesis gas. It can improve energy conversion efficiency and reduce pollutant emissions. The gasified biochar produced has a large specific surface area and a well-developed pore structure. It can effectively remove organic pollutants as an adsorbent. The combined combustion and gasification utilization technology of biomass and sludge will become a more promising process.

[0003] Circulating fluidized bed boilers have the characteristics of strong adaptability, high acceptance of fuel particle size range, easy ash utilization, and wide load adjustment range. They can be ideal equipment for the co-firing of biomass and oil sludge. However, the current research and application of co-firing in circulating fluidized bed boilers are mainly based on monomer co-firing, such as patent number ZL202310542404.2 and patent number ZL202310776002.9. There are fewer cases of co-firing oil sludge, and there are no reports on circulating fluidized bed systems for the co-firing of biomass and oil sludge. Therefore, it is urgent to develop a biomass and oil sludge pretreatment and circulating fluidized bed co-firing coupling system, which will bring positive effects on the economy and the environment. Summary of the invention

[0004] In view of the above problems, the present invention provides a coupled system and method for biomass and oil sludge pretreatment and circulating fluidized bed co-combustion. The system of the present invention can be used to pre-treat biomass and oil sludge and then apply them to circulating fluidized bed co-combustion, which effectively improves the overall combustion efficiency, reduces pollutant emissions, and reduces energy losses during the combustion process.

[0005] The first object of the present invention is to provide a biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system, comprising a biomass and oil sludge pretreatment system, a synthesis gas system and a circulating fluidized bed system;

[0006] The biomass and oil sludge pretreatment system is connected to the circulating fluidized bed system; the first biomass and oil sludge particles obtained by the biomass and oil sludge pretreatment system are mixed with coal and then enter the circulating fluidized bed system for combustion;

[0007] The biomass and sludge pretreatment system is connected to the synthesis gas system, and the synthesis gas system is connected to the circulating fluidized bed system; the second biomass and second sludge obtained by the biomass and sludge pretreatment system are mixed in the synthesis gas system to generate synthesis gas and sludge biomass charcoal; the synthesis gas enters the circulating fluidized bed system for gas supply, and the sludge biomass charcoal enters the circulating fluidized bed system for removing organic pollutants.

[0008] In a preferred embodiment of the present invention, the biomass and oil sludge pretreatment system comprises a biomass pretreatment system and an oil sludge pretreatment system;

[0009] The biomass pretreatment includes a biomass raw material crushing and screening system, a coarse-grained biomass silo and a fine-grained biomass silo; the coarse-grained discharge port of the biomass raw material crushing and screening system is connected to the inlet of the coarse-grained biomass silo; the outlet of the coarse-grained biomass silo is connected to the inlet of the circulating fluidized bed system; the fine-grained discharge port of the biomass raw material crushing and screening system is connected to the inlet of the fine-grained biomass silo; the outlet of the fine-grained biomass silo is connected to the synthesis gas system;

[0010] The oil sludge pretreatment system comprises a wet oil sludge silo and a dry oil sludge system, wherein the outlet of the wet oil sludge silo is connected to the synthesis gas system; the outlet of the dry oil sludge system is connected to the inlet of the circulating fluidized bed system;

[0011] The first biomass in the coarse biomass silo, the oil sludge particles in the dry oil sludge system and the coal are mixed and introduced into the circulating fluidized bed system for combustion;

[0012] The second biomass in the fine biomass silo and the second sludge in the wet sludge silo are mixed in the syngas system to generate syngas and sludge biochar.

[0013] In a preferred embodiment of the present invention, the dry oil sludge system comprises a dry oil sludge silo, an oil sludge granulator and an oil sludge granule silo;

[0014] The outlet of the dry oil sludge silo is communicated with the inlet of the oil sludge granulator, and the outlet of the oil sludge granulator is communicated with the inlet of the oil sludge pellet silo;

[0015] The first sludge in the dry sludge silo, coal and lime enter the sludge granulator for granulation, and the sludge particles obtained by granulation enter the sludge particle silo.

[0016] In a preferred embodiment of the present invention, the synthesis gas system comprises a microwave gasifier, an electric valve, a microwave temperature detection assembly, a coarse screen filter, a gas purification screen, a gas separator, a synthesis gas storage tank and a biomass charcoal collection box;

[0017] The electric valve is connected to the inlet of the microwave gasification furnace, a microwave temperature detection assembly is provided on the microwave gasification furnace, a coarse screen filter and the gas purification screen are provided inside the microwave gasification furnace, and the gas separator is provided on the top of the microwave gasification furnace;

[0018] The second biomass and the second oil sludge enter the microwave gasification furnace and are gasified to obtain a mixed gas and oil sludge biomass charcoal;

[0019] The mixed gas is passed through the coarse screen filter and the gas purification screen to remove particles in the mixed gas, and the mixed gas is passed through the gas separator to obtain synthesis gas, carbon dioxide and water vapor;

[0020] The oil sludge biomass char is collected into the biomass char collection box through the bottom outlet of the microwave gasification furnace.

[0021] In a preferred embodiment of the present invention, the synthesis gas system also includes a synthesis gas storage tank outlet valve and a synthesis gas injection assembly. The synthesis gas storage tank is provided with the synthesis gas storage tank outlet valve and the synthesis gas injection assembly, and the synthesis gas in the synthesis gas storage tank is delivered into the dilute phase zone of the circulating fluidized bed system through the synthesis gas injection assembly.

[0022] In a preferred embodiment of the present invention, the synthesis gas system further comprises a modification system and a biochar injection assembly; the outlet of the biochar collection box is connected to the inlet of the modification system, and the biochar injection assembly is provided at the outlet of the modification system;

[0023] After the oil sludge biochar enters the modification system for treatment, it is injected between the desulfurization tower and the bag filter of the circulating fluidized bed system through the biochar injection assembly.

[0024] The second object of the present invention is to provide a biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling process, using the above-mentioned biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system, the biomass raw material is crushed and screened by the biomass and oil sludge pretreatment system to obtain the first biomass and the second biomass; the oil sludge raw material is aired and the moisture is detected by the biomass and oil sludge pretreatment system to obtain the first oil sludge and the second oil sludge;

[0025] First, oil sludge, coal and lime are mixed and granulated to obtain oil sludge pellets;

[0026] The second biomass, the second oil sludge and the gasifying agent are gasified in the synthesis gas system to obtain a mixed gas and oil sludge biomass charcoal, the mixed gas is separated to obtain synthesis gas, carbon dioxide and water vapor, and the carbon dioxide and water vapor are circulated in the synthesis gas system as gasifying agents;

[0027] A mixture is obtained by mixing the first biomass, oil sludge particles and coal, and the mixture is added to the circulating fluidized bed system for combustion. Syngas is added to the circulating fluidized bed system as a heat source, and the oil sludge biomass char is modified to adsorb the flue gas formed after the combustion is completed to remove organic matter.

[0028] In a preferred embodiment of the present invention, the particle size of the first biomass is greater than 3 cm, and the particle size of the second biomass is less than or equal to 3 cm.

[0029] In a preferred embodiment of the present invention, the water content of the first oil sludge is less than 30%, and the water content of the second oil sludge is greater than or equal to 30%.

[0030] In a preferred embodiment of the present invention, the mixture is composed of the following components in percentage by mass: 10% to 30% of first biomass, 5% to 20% of oil sludge particles, and the rest is coal, which is 100% in total.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The biomass and sludge pretreatment and circulating fluidized bed co-combustion coupling system provided by the present invention has the main functions of raw material pretreatment, direct coupling of sub-portion feeding, gasification of biomass and sludge, and harmful flue gas treatment, covering the entire range from raw material treatment to flue gas recycling, and realizes the organic combination of the subsystems of these functions with the circulating fluidized bed boiler furnace body, thereby improving the efficiency of the entire co-combustion process, thereby ensuring the economy and practicality of the system.

[0033] The present invention utilizes a biomass and oil sludge pretreatment and a circulating fluidized bed co-combustion coupling system to simultaneously co-combust biomass and oil sludge, thereby lowering the ignition point. The two act synergistically to improve the overall combustion efficiency, reduce the emission of greenhouse gases and other pollutants, balance the calorific value and combustion characteristics of the fuel, and reduce energy loss during the combustion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Flow chart for pretreatment of biomass feedstock and oil sludge feedstock.

[0035] Figure 2 Schematic diagram of the structure for co-gasification of the second biomass and the second oil sludge to produce synthesis gas.

[0036] Figure 3 The present invention is a flow chart for the co-combustion of the first biomass, coal, oil sludge particles and synthesis gas in a circulating fluidized bed co-combustion system.

[0037] Figure numerals: 1-coarse biomass silo, 2-fine biomass silo, 3-second oil sludge silo, 4-first oil sludge silo, 5-oil sludge plunger pump, 6-oil sludge granulator, 7-oil sludge silo, 8-screw feeder, 9-microwave temperature detection component, 10-power display screen, 11-oil sludge inlet electric valve, 12-microwave heating zone, 13-filter coarse screen, 14-gas purification screen, 15-oil sludge biomass charcoal collection box, 16-gas Separator, 17-gasifying agent supply valve, 18-synthesis gas storage tank, 19-synthesis gas storage tank outlet valve, 20-synthesis gas electromagnetic injector, 21-oil sludge biochar modification and activation system, 22-biochar injection electromagnetic valve, 23-coal bunker, 24-coal feeder, 25-coal drop pipe, 26-furnace, 27-returner, 28-return leg, 29-tail flue, 30-desulfurization tower, 31-bag dust collector, 32-chimney, 33-ash storage. DETAILED DESCRIPTION

[0038] 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.

[0039] As described in the background technology, the current treatment of oil sludge is concentrated on landfill, hot washing, pyrolysis, solvent extraction, biological treatment, fuel or brick making, but the research on co-gasification with biomass to prepare synthesis gas and biochar has not been reported. In addition, in the relevant research and practice of co-firing in circulating fluidized bed boilers, the main focus is on monomer co-firing, and there is not much research and practice on the co-firing of biomass and oil sludge. In view of this situation, in order to improve the combustion completeness of biomass, oil sludge and coal and the efficiency of circulating fluidized bed boilers, the present invention provides a biomass and oil sludge pretreatment and circulating fluidized bed co-firing coupling system and method.

[0040] The following is further described in conjunction with specific embodiments.

[0041] Example 1

[0042] The circulating fluidized bed system for the mixed combustion of coal, biomass and oil sludge mainly includes a biomass and oil sludge pretreatment system, a synthesis gas system and a circulating fluidized bed system.

[0043] The biomass and oil sludge pretreatment system includes a biomass pretreatment system and an oil sludge pretreatment system;

[0044] The biomass pretreatment includes a biomass raw material crushing and screening system, a coarse biomass silo 1 and a fine biomass silo 2; Figure 1 As shown, the collected biomass raw materials can be pre-treated after being dried in the sun, and then put into the biomass raw material crushing and screening system. Specifically, the biomass raw material crushing and screening system includes a coarse crushing room and a fine crushing room. After the biomass raw materials are crushed in the coarse crushing room and the fine crushing room, they are respectively sent to the coarse biomass silo 1 and the fine biomass silo 2 according to the particle size. It should be noted that the first biomass with a particle size greater than 3.0 cm enters the coarse biomass silo, and the second biomass with a particle size ≤3.0 cm enters the fine biomass silo.

[0045] The sludge pretreatment system includes a wet sludge silo 3 and a dry sludge system. Specifically, the dry sludge system includes a dry sludge silo 4, a sludge granulator 6 and a sludge granule silo 7. During the production process, petrochemical enterprises will produce a large amount of sludge, and the main components of the sludge are 20% to 80% of moisture, ash and combustible volatile matter (crude oil). These sludge raw materials are collected and placed in a drying yard for processing. After drying, the moisture content of the sludge raw materials is tested. The moisture content ≥30% is the second sludge, and the moisture content <30% is the first sludge, which are stored in the second sludge silo 3 and the first sludge silo 4 respectively.

[0046] The first sludge is sent to the sludge granulator 6 through the sludge plunger pump 5 together with coal and lime in a mass ratio of 30%:50%:20% for mixing and granulation, and then the sludge particles are stored in the sludge particle silo 7. It should be noted that the moisture content of the sludge needs to be controlled to be constant during granulation, and moisture control needs to be considered when it is used in large quantities to avoid clogging of the screening system and the coal feeder. The sludge has a high moisture content, and the sludge granulation and co-combustion avoids the defect that after the sludge is directly sent into the furnace for combustion, the evaporation of these moisture will take away part of the heat from the material bed, affecting the bed temperature and the stable operation of the boiler.

[0047] After pre-treating the biomass raw material and the oil sludge raw material, the first biomass, the second biomass, the oil sludge particles and the second oil sludge are obtained respectively. The following four materials are subsequently treated in the synthesis gas system and the circulating fluidized bed system according to the requirements.

[0048] The first biomass, oil sludge particles and coal are respectively fed into the furnace of the circulating fluidized bed system through the coal feeder for combustion. It should be noted that oil sludge is easy to burn and has a lower pyrolysis temperature, initial combustion temperature and burnout temperature. The changes in flue gas volume and fly ash concentration after the oil sludge is mixed will also change the heat transfer, ash accumulation, corrosion and wear of the convection heating surface of the tail flue. Therefore, when the circulating fluidized bed boiler mixes oil sludge and biomass at the same time, it is necessary to reasonably allocate the mixing amount according to the properties of the fuel. The mixing amount of oil sludge particles and the first biomass is limited to 5wt%~20wt% and 10wt%~30wt%.

[0049] The second biomass is fed into the synthesis gas system through the screw feeder 8, and the second sludge is fed into the synthesis gas system through the sludge plunger pump 5. Figure 2 shown.

[0050] The second biomass is fed into the microwave gasification furnace through the screw feeder 8, and the second sludge is fed into the microwave gasification furnace through the sludge plunger pump 5. The feeding amount of the second sludge is controlled by the sludge inlet electric valve 11. The microwave temperature detection component 9 monitors the gasification temperature in the furnace. The microwave temperature detection component 9 is such as a microwave thermocouple. The microwave temperature detection component 9 is connected to the power display screen 10 to display the gasification temperature and power.

[0051] The second biomass and the second oil sludge are mixed at a mass ratio of 4:1, and are sent into the microwave gasifier with the gasifying agent, and a gasification reaction occurs in the microwave heating zone 12. The second biomass and the second oil sludge produce a synergistic effect in the microwave gasifier. The water content in the oil sludge is relatively high, and water vapor can promote the development of the pore structure of biomass coke. The heavy metal elements such as zinc, iron, nickel, copper, and manganese contained in the oil sludge catalyze the cracking of the macromolecular groups of biomass charcoal, which can significantly improve the gasification effect and reduce the tar yield. In addition, the functional groups containing more hydrogen are easily decomposed to form hydrogen-containing gases and small molecular groups when heated, which can react with the free radicals in the biomass, inhibit the condensation reaction of biochar, and promote the gasification reaction. The alkali and alkaline earth metals rich in biomass can catalyze the gasification of oil sludge, increase the surface active centers and active surface area of ​​oil sludge coke, thereby improving the activity of the gasification reaction and producing more combustible gas H 2 and CO. After high-temperature gasification at 800°C in the microwave heating zone 12, a synthesis gas with a high calorific value can be generated, but it should be noted that what is obtained at this time is a mixed gas. Two layers of sieves are arranged in the microwave gasifier. The aperture of the coarse screen filter 13 is 100μm, and the gas purification screen 14 is a sieve with an aperture of 50μm to prevent the gas from carrying biomass and oil sludge particles. The top outlet of the gasifier is connected to a gas separator 16. The mixed gas passes through the gas separator 16 to separate the synthesis gas and CO in the mixed gas. 2 and water vapor separation, CO 2The syngas is stored in a syngas storage tank 18. The syngas includes CO, CH 4 , H 2 The syngas flow rate is controlled by the syngas tank outlet valve 19 and sent to the circulating fluidized bed boiler by the syngas electromagnetic injector 20 for combustion. The amount of gas supply is determined according to the temperature distribution of the furnace dilute phase zone. Figure 3 As shown, two holes are opened in the left wall and the right wall of the furnace, and synthesis gas electromagnetic injectors 20 are installed respectively.

[0052] In the process of gasification, byproduct oil sludge biochar is also produced. The oil sludge biochar with a particle size of less than 100 μm obtained after gasification of the second biomass and oil sludge is collected in the biochar collection box 15. The oil sludge biochar is modified in the oil sludge biochar modification and activation system 21. Specifically, the oil sludge biochar modification and activation system 21 is modified by impregnation with a 1.5 mol / L KOH solution and heated at 200°C N in a tubular furnace. 2 After being treated in an environmentally friendly manner, the biochar is injected between the desulfurization tower and the bag filter through the biochar injection solenoid valve 22 in the form of a carrying flow, which can effectively remove organic pollutants such as dioxins generated after the sludge is burned, thereby achieving a recycling effect.

[0053] like Figure 3 As shown, the circulating fluidized bed system includes a furnace 26, a return feeder 27, a return feeder leg 28, a tail flue 29, a desulfurization tower 30 and a bag filter 31. The first biomass in the coarse biomass silo 1, the oil sludge in the oil sludge silo 7 and the coal in the coal silo 23 are mixed through a belt conveyor mixing system, and then enter the furnace 26 in the circulating fluidized bed system through a coal feeder 24 and a coal drop pipe 25 for combustion. During the combustion process, the primary air provides the oxygen for combustion, and the synthesis gas is sent to the circulating fluidized bed boiler through the synthesis gas storage tank 18 as a supplementary heat source. The combustion condition can be adjusted by burning in the dilute phase zone, and then the first biomass, sludge particles, coal and synthesis gas are fully burned in the furnace 26, and the incompletely burned fuel falls under the action of gravity through the return device 27, and is sent into the furnace for re-combustion through the return leg 28. The return device 27 used in the present invention is a spiral return device. The flue gas formed by complete combustion passes through the tail flue 29 and the desulfurization tower 30, and then the sludge biomass is used to remove the dioxins and other organic matter generated after the sludge is mixed and burned, and then it is discharged from the chimney 32 after the ash is removed by the bag dust collector 31, and the ash falls into the ash bin 33.

[0054] The combustion of biomass or sludge alone is incomplete or unstable, and the combustion efficiency is low. The combustion of sludge will produce more sulfur dioxide and heavy metal pollution, while the combustion of biomass may produce more particulate matter. The present invention provides a coupling system for biomass and sludge pretreatment and circulating fluidized bed co-combustion. After the biomass and sludge are co-combusted at the same time, the ignition point can be reduced. The two have a synergistic effect, improve the overall combustion efficiency, reduce the emission of greenhouse gases and other pollutants, balance the calorific value and combustion characteristics of the fuel, and reduce the energy loss during the combustion process. The treatment of sludge and biomass waste can reduce carbon emissions, improve the utilization rate of solid waste resources, and further reduce costs.

[0055] The system also has major functions such as raw material pretreatment, direct coupling of feed in different parts, gasification of biomass and sludge, and harmful flue gas treatment, covering the entire range from raw material treatment to flue gas recycling, and realizing the organic combination of these functional subsystems with the circulating fluidized bed boiler furnace, thus improving the efficiency of the entire blending process, thereby ensuring the economy and practicality of the system.

[0056] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system, characterized in that: Including biomass and sludge pretreatment systems, syngas systems and circulating fluidized bed systems; The biomass and oil sludge pretreatment system is connected to the circulating fluidized bed system; the first biomass and oil sludge particles processed by the biomass and oil sludge pretreatment system are mixed with coal and then enter the circulating fluidized bed system for combustion; The biomass and oil sludge pretreatment system comprises a biomass pretreatment system and an oil sludge pretreatment system; The biomass pretreatment system comprises a biomass raw material pulverizing and screening system, a coarse-grained biomass silo (1) and a fine-grained biomass silo (2); the coarse-grained discharge port of the biomass raw material pulverizing and screening system is connected to the inlet of the coarse-grained biomass silo (1); the outlet of the coarse-grained biomass silo (1) is connected to the inlet of the circulating fluidized bed system; the fine-grained discharge port of the biomass raw material pulverizing and screening system is connected to the inlet of the fine-grained biomass silo (2); the outlet of the fine-grained biomass silo (2) is connected to the synthesis gas system; The oil sludge pretreatment system comprises a wet oil sludge silo (3) and a dry oil sludge system, wherein the outlet of the wet oil sludge silo (3) is connected to the synthesis gas system; and the outlet of the dry oil sludge system is connected to the inlet of the circulating fluidized bed system; The first biomass in the coarse biomass silo (1), the oil sludge particles in the dry oil sludge system and the coal are mixed and introduced into the circulating fluidized bed system for combustion; The second biomass in the fine biomass silo (2) and the second sludge in the wet sludge silo (3) are mixed in the syngas system to generate syngas and sludge biomass charcoal; The biomass and sludge pretreatment system is connected to the synthesis gas system, and the synthesis gas system is connected to the circulating fluidized bed system; the second biomass and second sludge processed by the biomass and sludge pretreatment system are mixed in the synthesis gas system to generate synthesis gas and sludge biomass charcoal; the synthesis gas enters the circulating fluidized bed system for gas supply, and the sludge biomass charcoal enters the circulating fluidized bed system for removing organic pollutants.

2. The biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system according to claim 1 is characterized in that: The dry oil sludge system comprises a dry oil sludge silo (4), an oil sludge granulator (6) and an oil sludge granule silo (7); The outlet of the dry oil sludge silo (4) is in communication with the inlet of the oil sludge granulator (6), and the outlet of the oil sludge granulator (6) is in communication with the inlet of the oil sludge granulator silo (7); The first oil sludge in the dry oil sludge silo (4) enters the oil sludge granulator (6) for granulation, and the oil sludge particles obtained by granulation enter the oil sludge particle silo (7).

3. The biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system according to claim 1 is characterized in that: The synthesis gas system comprises a microwave gasifier, an electric valve (11), a microwave temperature detection component (9), a coarse screen filter (13), a gas purification screen (14), a gas separator (16), a synthesis gas storage tank (18) and a biomass charcoal collection box (15); The electric valve (11) is connected to the inlet of the microwave gasification furnace, a microwave temperature detection component (9) is provided on the microwave gasification furnace, a coarse screen filter (13) and the gas purification screen (14) are provided inside the microwave gasification furnace, and the gas separator (16) is provided on the top of the microwave gasification furnace; The second biomass and the second oil sludge enter the microwave gasification furnace and are gasified to obtain a mixed gas and oil sludge biomass charcoal; The mixed gas passes through the coarse screen filter (13) and the gas purification screen (14) to remove particles in the mixed gas, and the mixed gas passes through the gas separator (16) to obtain synthesis gas, carbon dioxide and water vapor; The oil sludge biochar is collected into the biochar collection box (15) through the bottom outlet of the microwave gasification furnace.

4. The biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system according to claim 3 is characterized in that: The synthesis gas system further comprises a synthesis gas storage tank outlet valve (19) and a synthesis gas injection assembly (20); the synthesis gas storage tank (18) is provided with the synthesis gas storage tank outlet valve (19) and the synthesis gas injection assembly (20); the synthesis gas in the synthesis gas storage tank (18) is sent into the dilute phase zone of the circulating fluidized bed system through the synthesis gas injection assembly (20).

5. The biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system according to claim 3 is characterized in that: The synthesis gas system further comprises a modification system and a biochar injection assembly (22); the outlet of the biochar collection box (15) is connected to the inlet of the modification system, and the outlet of the modification system is provided with the biochar injection assembly (22); After the oil sludge biochar enters the modification system for processing, it is injected through the biochar injection assembly (22) into the space between the desulfurization tower and the bag filter of the circulating fluidized bed system.

6. A method for coupling biomass and oil sludge pretreatment and circulating fluidized bed co-combustion, characterized in that: Using the biomass and oil sludge pretreatment and circulating fluidized bed co-combustion coupling system according to any one of claims 1 to 5, the biomass raw material is crushed and screened by the biomass and oil sludge pretreatment system to obtain the first biomass and the second biomass; the oil sludge raw material is aired and the moisture is detected by the biomass and oil sludge pretreatment system to obtain the first oil sludge and the second oil sludge; First, oil sludge, coal and lime are mixed and granulated to obtain oil sludge pellets; The second biomass, the second oil sludge and the gasifying agent are gasified in the synthesis gas system to obtain a mixed gas and oil sludge biomass charcoal, the mixed gas is separated to obtain synthesis gas, carbon dioxide and water vapor, and the carbon dioxide and water vapor are circulated in the synthesis gas system as gasifying agents; A mixture is obtained by mixing the first biomass, oil sludge particles and coal, and the mixture is added to the circulating fluidized bed system for combustion. Syngas is added to the circulating fluidized bed system as a heat source, and the oil sludge biomass char is modified to adsorb the flue gas formed after the combustion is completed to remove organic matter.

7. A method for coupling biomass and oil sludge pretreatment and circulating fluidized bed co-combustion according to claim 6, characterized in that: The particle size of the first biomass is greater than 3 cm, and the particle size of the second biomass is less than or equal to 3 cm.

8. The method for coupling biomass and oil sludge pretreatment and circulating fluidized bed co-combustion according to claim 6, characterized in that: The water content of the first sludge is less than 30%, and the water content of the second sludge is ≥30%.

9. The method for coupling biomass and oil sludge pretreatment and circulating fluidized bed co-combustion according to claim 6, characterized in that: The mixture consists of the following components in percentage by mass: 10% to 30% of first biomass, 5% to 20% of oil sludge particles, and the rest of coal, which is 100% in total.

Images