Coal-fired circulating fluidized bed boiler system for blending combustion of biomass and oil sludge

Abstract

The invention relates to the technical field of coal-fired circulating fluidized bed boilers, in particular to a coal-fired circulating fluidized bed boiler system for blending combustion of biomass and oil sludge. Comprising a biomass pretreatment system, an oil sludge pretreatment system, a biomass synthesis gas generation system and a circulating fluidized bed boiler, and the biomass pretreatment system, the oil sludge pretreatment system and the biomass synthesis gas generation system communicate with the interior of the circulating fluidized bed boiler; the biomass pretreatment system is used for dividing biomass into a coarse biomass material and a fine biomass material; the oil sludge pretreatment system is used for dividing oil sludge into dry oil sludge and wet oil sludge; the biomass synthesis gas generation system takes a fine biomass material as input and is used for reacting the fine biomass material with a gasifying agent to generate synthesis gas; the combustion effect is enhanced, the cost is reduced, and sufficient combustion in the hearth is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coal-fired circulating fluidized bed boilers, and in particular to a coal-fired circulating fluidized bed boiler system for mixing and burning biomass and oil sludge. Background Art

[0002] Oilfield chemical companies often produce a lot of oil sludge during production and operation. Oil sludge is a hazardous waste and needs to be treated by a special organization, which will increase the burden on the company. Incineration is the most thorough way to treat oil sludge, with outstanding advantages such as fast processing speed, high reduction degree, and resource recycling. In addition, Xinjiang and other regions produce a large amount of domestic garbage and biomass such as cotton and straw every year. A large part of these domestic garbage and biomass is treated by combustion, which can not only reduce the amount of domestic garbage and biomass, but also improve the utilization rate of waste.

[0003] The development of social economy is accompanied by the consumption of energy. At the same time, the environmental pollution caused by it has attracted increasing attention. my country's total carbon emissions and its proportion of the global total have shown an increasing trend year by year. Therefore, my country requires strengthening the integrated development of oil and gas exploration and development with new energy, vigorously promoting the development of new energy and low-carbon and negative carbon industries, integrating the upstream oil and gas fields with new energy and new industries, and developing a new pattern of multi-energy complementarity, and continuously promoting the transformation and upgrading of energy production and supply structure. Combined with the current actual situation of Xinjiang Oilfield, there is a large amount of usable biomass (corn stalks, cotton stalks, etc.) around the oilfield. As a "zero-carbon" fuel, biomass can play a huge role in energy utilization. At present, many biomass power plants will compress and heat the biomass into pellets for utilization. Although this method can increase the density and calorific value of biomass and facilitate the transportation and utilization of biomass, it has the following problems: (1) The compression and heat forming of biomass will increase the cost; (2) Biomass contains a large amount of alkali metals and alkaline earth metals. When burned and utilized, they will enter the gas phase and cause ash and slag accumulation on the boiler heat exchange surface, seriously affecting the life of the boiler. These problems restrict the direct combustion of biomass. When biomass is gasified, part of the alkali metals remain in the coke, and the amount of alkali metals precipitated into the gas phase is reduced, which can greatly alleviate the above problems. In addition, the utilization of syngas has good flexibility and has a very good prospect.

[0004] Prior art CN110791347A discloses a system for mixing and processing sludge and biomass, including a feeding module, a sludge processing module, a solvent circulation module, a particle forming module and a control module; the feeding module is used to load biomass materials and mix them with sludge; the sludge processing module is used to dissolve the sludge to dilute the sludge; the solvent circulation module is used to recover the solvent used in the sludge processing process; the particle forming module is used to hot press the mixture of sludge and biomass materials; the control module is used to monitor and control the materials in the feeding module and the sludge processing module. The above system processes sludge and biomass by hot pressing biomass and sludge to form pellet fuel, and then sending the pellet fuel into a circulating fluidized bed boiler for combustion. The hot pressing operation will increase the cost. At the same time, the above system does not gasify the biomass. The method of sending the pellet fuel into the circulating fluidized bed boiler for combustion may cause the circulating fluidized bed boiler to be insufficiently burned or unevenly distributed.

[0005] Therefore, there is an urgent need to provide a coal-fired circulating fluidized bed boiler system that burns biomass and sludge. Compared with the existing technology, it can solve the problems of insufficient or uneven combustion of circulating fluidized bed boilers, as well as the problems of safety, environmental protection and high cost in sludge treatment. Summary of the invention

[0006] The present invention solves the technical problems existing in the prior art and provides a coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge, comprising a biomass pretreatment system, an oil sludge pretreatment system, a biomass synthesis gas generation system and a circulating fluidized bed boiler, wherein the biomass pretreatment system, the oil sludge pretreatment system and the biomass synthesis gas generation system are respectively connected to the inside of the circulating fluidized bed boiler;

[0009] The biomass pretreatment system is used to separate the biomass into coarse biomass material and fine biomass material;

[0010] The oil sludge pretreatment system is used to separate the oil sludge into dry oil sludge and wet oil sludge;

[0011] The biomass synthesis gas generation system takes fine biomass as input and is used to react the fine biomass with a gasifying agent to generate synthesis gas.

[0012] Furthermore, the biomass syngas generation system comprises a syngas generation furnace, a biomass char collection box and an electric heating area, the biomass char collection box is arranged at the lower end of the syngas generation furnace, and the electric heating area is located inside the syngas generation furnace;

[0013] The syngas generating furnace is provided with a fine biomass material inlet at a position corresponding to the electric heating area, and the fine biomass material inlet is connected to the biomass pretreatment system. A gasifying agent inlet is provided at the lower end of the side wall of the syngas generating furnace, and the gasifying agent inlet is connected to the induced draft fan outlet. A syngas outlet is provided at the upper end of the syngas generating furnace, and the syngas outlet is connected to the circulating fluidized bed boiler.

[0014] Furthermore, fine grates and coarse grates are sequentially arranged inside the synthesis gas generation furnace from bottom to top, and the fine grates and the coarse grates are arranged between the electric heating area and the biomass char collection box.

[0015] Furthermore, two pipelines are connected between the fine biomass material inlet and the biomass pretreatment system, namely a main pipeline and a secondary pipeline. The main pipeline and the secondary pipeline are arranged in parallel. A fine material inlet electric valve is connected in series on the main pipeline, and a fine material inlet bypass manual valve and a fine material inlet bypass electric valve are connected in series on the secondary pipeline.

[0016] Furthermore, two pipelines are connected between the gasification agent inlet and the induced draft fan outlet, namely a main pipeline and a secondary pipeline, the main pipeline and the secondary pipeline are arranged in parallel, a gasification disturbance air outlet manual valve and a gasification disturbance air outlet electric valve are connected in series on the main pipeline, and a gasification disturbance air outlet bypass manual valve is connected in series on the secondary pipeline.

[0017] Furthermore, the pore size of the coarse grate is 100 μm, and the pore size of the fine grate is 50 μm.

[0018] Furthermore, the left wall and the right wall of the circulating fluidized bed boiler furnace body are provided with gas charge inlets, the gas charge inlets are arranged in the middle of the furnace body, and the gas charge inlets are connected with the synthesis gas outlet through an annular gas supply pipe.

[0019] Furthermore, the sludge pretreatment system pretreats the sludge as follows: first, the sludge is placed in a sludge drying yard for drying, and then the sludge is divided into dry sludge and wet sludge according to the water content. The sludge with a water content less than or equal to 15% is dry sludge, and the sludge with a water content greater than 15% is wet sludge. The wet sludge is pumped into a sludge feeder through a sludge slurry pump for storage.

[0020] Furthermore, the outlet of the sludge feeder is connected to a first pipeline and a second pipeline respectively. The end of the first pipeline away from the sludge feeder is connected to the upper end of the furnace body of the circulating fluidized bed boiler, and the end of the second pipeline away from the sludge feeder is connected to the rear wall of the furnace body of the circulating fluidized bed boiler. The first pipeline is connected in series with a furnace top injection electric valve and a furnace top injection manual valve, and the second pipeline is connected in series with a furnace rear injection electric valve and a furnace rear injection manual valve.

[0021] Furthermore, the biomass pretreatment system pretreats the biomass in the following way: first, the biomass is transported to the iron removal room to remove the iron blocks in the biomass, and then the biomass is transported to the coarse crushing room and the fine crushing room in turn for crushing, and then the crushed biomass is divided into coarse biomass material and fine biomass material according to the size of the particle size, the particle size greater than 3 cm is the coarse biomass material, and the particle size less than or equal to 3 cm is the fine biomass material.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention separates the oil sludge into dry oil sludge and wet oil sludge after pretreatment, separates the biomass into coarse biomass and fine biomass after pretreatment, and then sends the fine biomass bin into the synthesis gas generator to react with the gasifier to generate synthesis gas, and then respectively inputs the dry oil sludge, wet oil sludge, coarse biomass and synthesis gas into the furnace for combustion. By mixing the biomass and oil sludge and reacting the biomass with the gasifier to form synthesis gas, it is beneficial to enhance the combustion effect, reduce the cost, and ensure sufficient combustion inside the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of biomass and oil sludge pretreatment of the present invention.

[0025] Figure 2 It is a schematic diagram of the biomass synthesis gas generation system of the present invention.

[0026] Figure 3 It is a schematic diagram of the biomass and oil sludge co-combustion system of the present invention.

[0027] Description of reference numerals:

[0028] 1. Coarse biomass silo; 2. Fine biomass silo; 3. Dry oil sludge silo; 4. Oil sludge slurry pump; 5. Oil sludge feeder;

[0029] 6. Manual valve for bypass of fine material inlet; 7. Electric valve for bypass of fine material inlet; 8. Electric valve for fine material inlet; 9. Electric heating area; 10. Coarse grate; 11. Fine grate; 12. Biomass char collection box; 13. Manual valve for gasification disturbance air outlet; 14. Electric valve for gasification disturbance air outlet; 15. Manual valve for bypass of gasification disturbance air outlet; 16. Synthesis gas storage tank; 17. Gas storage tank outlet valve; 18. Synthesis gas injection solenoid valve; 19. Electric valve for injection at furnace top; 20. Manual valve for injection at furnace top; 21. Electric valve for injection at the rear of furnace; 22. Manual valve for injection at the rear of furnace; 23. Synthesis gas outlet; 24. Coal drop pipe; 25. Air hood; 26. Return material air hood. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] The present invention provides a coal-fired circulating fluidized bed boiler system for co-burning biomass and oil sludge, comprising a biomass pretreatment system, an oil sludge pretreatment system, a biomass synthesis gas generation system and a circulating fluidized bed boiler, wherein the output ends of the biomass pretreatment system, the oil sludge pretreatment system and the biomass synthesis gas generation system are all connected to the circulating fluidized bed boiler, the biomass pretreatment system is used to distinguish between coarse biomass materials and fine biomass materials, the oil sludge pretreatment system is used to distinguish between wet oil sludge and dry oil sludge, the biomass synthesis gas generation system is used to generate biomass synthesis gas required for combustion of a combustion treatment system, and the circulating fluidized bed boiler is used to perform combustion treatment on oil sludge, coarse biomass materials and biomass synthesis gas.

[0032] Furthermore, the standard for the biomass pretreatment system to distinguish between coarse biomass and fine biomass is: the particle size is greater than 3 cm for coarse biomass, and the particle size is less than or equal to 3 cm for fine biomass silo 2; the standard for the sludge pretreatment system to distinguish between wet sludge and dry sludge is: the moisture content is greater than 15% for wet sludge, and the moisture content is less than or equal to 15% for dry sludge.

[0033] like Figure 1As shown, the biomass pretreatment system will simply dry the biomass (corn stalks, cotton stalks, etc.) collected from the surrounding areas and then enter the iron removal room, coarse crushing room and fine crushing room in turn to process the biomass. According to the particle size (diameter), the treated biomass enters the coarse biomass silo 1 and the fine biomass silo 2 respectively. Particles with a diameter greater than 3 cm are considered to be coarse biomass and enter the coarse biomass silo 1; particles with a diameter less than or equal to 3 cm are considered to be fine biomass silo 2 and enter the fine biomass silo 2.

[0034] First, the iron blocks in the biomass are removed in the iron removal room. The purpose is twofold: first, when the iron enters the coarse biomass silo 1 and enters the furnace through the belt coal feeder, it may scratch the belt, or even cut the belt in serious cases; second, when the iron enters the fine biomass silo 2, it may block or damage the grate of the syngas generator. Then the biomass is crushed in the coarse crushing room and the fine crushing room in turn.

[0035] The sludge pretreatment system first places the sludge in the sludge drying yard for drying, and distinguishes wet sludge and dry sludge according to the moisture content. The sludge with a moisture content greater than 15% is considered to be wet sludge, which is divided into a wet sludge bin, and then the sludge slurry pump 4 pumps the wet sludge in the wet sludge bin into the sludge feeder 5 for storage; the sludge with a moisture content less than or equal to 15% is considered to be dry sludge, which is divided into a dry sludge bin 3. In the production process, petrochemical enterprises will produce a large amount of sludge, which will be collected and placed in the drying yard for treatment. The sludge is different from the coal sludge and sewage sludge that are currently mixed with many power plants. The viscosity of the sludge is much greater than that of the coal sludge, so it cannot be referenced by the coal sludge standard (water content ≤ 30%, sent to the furnace through the coal sludge system).

[0036] like Figure 2As shown, the biomass syngas generation system includes a syngas generation furnace, a coarse grate 10, a fine grate 11, a biomass char collection box 12 and an electric heating area 9. A fine biomass material inlet is provided on the side wall of the syngas generation furnace. The fine biomass material inlet end is connected to a fine biomass material bin 2. Two pipelines are connected between the fine biomass material inlet and the fine biomass material bin 2, one is a main pipeline, and the other is a secondary pipeline. The main pipeline and the secondary pipeline are arranged in parallel. A fine material inlet electric valve 8 is connected in series to the main pipeline, and a fine material inlet bypass manual valve 6 and a fine material inlet bypass electric valve 7 are connected in series to the secondary pipeline. The secondary pipeline is operated when the main pipeline fails or is under maintenance; the syngas generation furnace A biomass coke collection box 12 is provided at the lower end, and a fine grate 11, a coarse grate 10 and an electric heating area 9 are provided inside the synthesis gas generation furnace from bottom to top, and the fine grate 11 is arranged above the biomass coke collection box 12; two gasification agent inlets are provided at the lower end of the synthesis gas generation furnace, and the two gasification agent inlets are arranged oppositely, and the gasification agent inlet is located between the fine grate 11 and the coarse grate 10; the working principle of the synthesis gas generation furnace is the gasification of biomass, and the biomass and the gasification agent (carbon dioxide, water vapor and air) are gasified at high temperature to generate a synthesis gas with a high calorific value, and the components of the synthesis gas are mainly carbon monoxide, methane and hydrogen. The gas source of the gasification agent is taken from the outlet of the induced draft fan, because the tail gas at the outlet of the induced draft fan is desulfurized and denitrified, and the main components are carbon dioxide and water vapor and a small amount of air. Relevant research shows that when carbon dioxide and water vapor are used as biomass gasification agents, the content of carbon monoxide and hydrogen components in the synthesis gas is relatively high, and the calorific value is also relatively high. After passing through the filter, the gasifier is sent to the synthesis gas generator. Two pipelines are connected between the outlet of the induced draft fan and the synthesis gas generator, one is the main pipeline, and the other is the auxiliary pipeline. The main pipeline and the auxiliary pipeline are arranged in parallel. The gasifier output end of the auxiliary pipeline merges into the gasifier output end of the main pipeline. The gasifier output end of the main pipeline is respectively connected to the two gasifier inlets of the synthesis gas generator. The main pipeline is connected in series with a gasification disturbance air outlet manual valve 13 and a gasification disturbance air outlet electric valve 14. The auxiliary pipeline is connected in series with a gasification disturbance air outlet bypass manual valve 15. The auxiliary pipeline is used when the main pipeline fails or is repaired. A plurality of synthesis gas outlets 23 are arranged at the upper end of the synthesis gas generator, and the synthesis gas generator is connected to the synthesis gas storage tank 16 through the synthesis gas outlet 23 at the upper end.

[0037] The gasifier is fed into the syngas generator through the bottom of the syngas generator. Two layers of grates are arranged in the syngas generator. The fine grate 11 is a grate with an aperture of 50 μm, and the coarse grate 10 is a grate with an aperture of 100 μm. After the biomass is gasified, the biomass coke (particle size <100 μm) with a particle size that meets the requirements is collected in the biomass coke collection box 12. The gasifier enters from the bottom of the syngas generator, which can not only make the biomass and the gasifier fully mixed, but also has a certain disturbance effect, so that the biomass materials and the biomass materials and the grates collide repeatedly, further exposing the inside of the biomass and contacting the gasifier more widely, so that the biomass coke obtained will have a better specific surface and pore structure. Biomass coke, i.e., biomass coke, is a material with a large specific surface area and a good pore structure. After being modified and activated under certain conditions, it can be used to adsorb heavy metals and the like with soil, and has certain economic value. The electric heating area 9 is a reaction area for biomass and gasification agent, and is heated by electric heating, and its power supply can be taken from a 6KV plant transformer.

[0038] like Figure 3 As shown, the circulating fluidized bed boiler includes a furnace body, a coal feeder, an air preheater, a desulfurization tower and a bag filter. A solid charge inlet is provided at the lower part of the furnace body side wall, and a gas charge inlet is provided at the middle part of the furnace body side wall. The solid charge inlet is connected to the coal feeder through a coal drop pipe 24. A dry sludge bin 3, a coal bin and a coarse biomass bin 1 are provided above the coal feeder crawler. The solid charge fed into the furnace body includes dry sludge, coal and coarse biomass. The upper end of the furnace body is connected to the sludge feeder 5 through a pipeline. The sludge feeder 5 is arranged above the furnace body, and its outlet is divided into two pipelines. The first pipeline is connected to the top of the furnace body, and the first pipeline is connected in series with the furnace top injection electric valve 19 and the furnace top injection manual valve 20; the second pipeline is connected to the furnace chamber rear wall of the furnace body, and the second pipeline is connected in series with the furnace back injection electric valve 21 and the furnace back injection manual valve 22. Since the sludge is easy to burn, it has a lower pyrolysis temperature, initial combustion temperature and burnout temperature, and the time required for complete combustion is also less. The oil sludge has a high water content. When the oil sludge enters the furnace and burns, the water evaporates and takes away some heat from the material bed (directly affecting the bed temperature). This change will affect the stable operation of the boiler. Moreover, the changes in flue gas volume and fly ash concentration after the oil sludge is mixed will also change the heat transfer, ash accumulation 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.

[0039] The left and right walls in the middle of the furnace body are provided with gas charge inlets, and each gas charge inlet end is installed with a synthesis gas injection solenoid valve 18. The two gas charge inlets are supplied with gas through an annular gas supply pipe surrounding the furnace body. The inlet end of the annular gas supply pipe is connected to the synthesis gas storage tank 16, and the gas storage tank outlet valve 17 is connected in series to the pipeline connecting the synthesis gas storage tank 16 and the annular gas supply pipe. The synthesis gas is sent to the dilute phase zone of the circulating fluidized bed boiler for combustion. This is because most circulating fluidized bed boilers will arrange platen superheaters and reheaters on the front side of the furnace. If the front wall of the furnace is opened to inject synthesis gas, on the one hand, it will cause the structure to be too compact, and on the other hand, it is easy to cause the platen heating surface to overheat. Therefore, gas charge inlets are opened on the left and right walls of the furnace, and synthesis gas injection solenoid valves 18 are installed respectively. Gas is supplied by an annular gas supply pipe around the furnace, and the amount of gas supply is determined according to the temperature distribution of the dilute phase zone of the furnace.

[0040] A water-cooled air chamber is also provided at the lower end of the furnace body, and a wind hood 25 is provided at the upper end of the water-cooled air chamber. The furnace body is also connected to the cyclone separator, and a return wind hood 26 is provided at the lower end of the cyclone separator. The gas after combustion in the furnace body passes through the cyclone separator, the air preheater, and the desulfurization tower in turn into the bag dust collector. Finally, the gas is discharged into the atmosphere through the chimney connected to the bag dust collector, and the solid enters the ash bin through the bag dust collector.

[0041] The working principle of the coal-fired circulating fluidized bed boiler system for the mixed combustion of biomass and oil sludge provided by the present invention is as follows: the oil sludge is pretreated and divided into dry oil sludge and wet oil sludge, and then the biomass is pretreated and divided into coarse biomass material and fine biomass material, and then the fine biomass material bin 2 is sent into the synthesis gas generation furnace to react with the gasification agent to generate synthesis gas, and then the dry oil sludge, wet oil sludge, coarse biomass material and synthesis gas are respectively input into the furnace for combustion. By mixing the biomass and oil sludge and simultaneously using the biomass as synthesis gas, it is beneficial to enhance the combustion effect, reduce the cost, and ensure sufficient combustion inside the furnace.

[0042] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A coal-fired circulating fluidized bed boiler system for burning biomass and oil sludge, characterized in that: It includes a biomass pretreatment system, an oil sludge pretreatment system, a biomass synthesis gas generation system and a circulating fluidized bed boiler, wherein the biomass pretreatment system, the oil sludge pretreatment system and the biomass synthesis gas generation system are respectively connected to the inside of the circulating fluidized bed boiler; The biomass pretreatment system is used to separate the biomass into coarse biomass material and fine biomass material; The oil sludge pretreatment system is used to separate the oil sludge into dry oil sludge and wet oil sludge; The biomass synthesis gas generation system takes fine biomass as input and is used to react the fine biomass with a gasifying agent to generate synthesis gas.

2. A coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 1, characterized in that: The biomass syngas generation system comprises a syngas generation furnace, a biomass char collection box and an electric heating area, wherein the biomass char collection box is arranged at the lower end of the syngas generation furnace, and the electric heating area is located inside the syngas generation furnace; The syngas generating furnace is provided with a fine biomass material inlet at a position corresponding to the electric heating area, and the fine biomass material inlet is connected to the biomass pretreatment system. A gasifying agent inlet is provided at the lower end of the side wall of the syngas generating furnace, and the gasifying agent inlet is connected to the induced draft fan outlet. A syngas outlet is provided at the upper end of the syngas generating furnace, and the syngas outlet is connected to the circulating fluidized bed boiler.

3. A coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 2, characterized in that: A fine grate and a coarse grate are sequentially arranged inside the synthesis gas generating furnace from bottom to top, and the fine grate and the coarse grate are arranged between the electric heating area and the biomass char collecting box.

4. A coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 3, characterized in that: The fine biomass material inlet is connected to the biomass pretreatment system by two pipelines, namely a main pipeline and a secondary pipeline. The main pipeline and the secondary pipeline are arranged in parallel. A fine material inlet electric valve is connected in series on the main pipeline, and a fine material inlet bypass manual valve and a fine material inlet bypass electric valve are connected in series on the secondary pipeline.

5. The coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 3, characterized in that: Two pipelines are connected between the gasification agent inlet and the induced draft fan outlet, namely a main pipeline and a secondary pipeline. The main pipeline and the secondary pipeline are arranged in parallel. A gasification disturbance air outlet manual valve and a gasification disturbance air outlet electric valve are connected in series on the main pipeline, and a gasification disturbance air outlet bypass manual valve is connected in series on the secondary pipeline.

6. The coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 3, characterized in that: The pore size of the coarse grate is 100 μm, and the pore size of the fine grate is 50 μm.

7. The coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 2, characterized in that: The left wall and the right wall of the circulating fluidized bed boiler furnace body are both provided with gas charge inlets, which are arranged in the middle of the furnace body. The gas charge inlet is connected with the synthesis gas outlet through an annular gas supply pipe.

8. The coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 1, characterized in that: The sludge pretreatment system pretreats the sludge as follows: first place the sludge in the sludge drying yard for drying, and then separate the sludge into dry sludge and wet sludge according to the water content. The sludge with a water content less than or equal to 15% is dry sludge, and the sludge with a water content greater than 15% is wet sludge. The wet sludge is pumped into the sludge feeder through a sludge slurry pump for storage.

9. A coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 8, characterized in that: The outlet of the sludge feeder is connected to the first pipeline and the second pipeline respectively. The end of the first pipeline away from the sludge feeder is connected to the upper end of the furnace body of the circulating fluidized bed boiler, and the end of the second pipeline away from the sludge feeder is connected to the rear wall of the furnace body of the circulating fluidized bed boiler. The first pipeline is connected in series with a furnace top injection electric valve and a furnace top injection manual valve, and the second pipeline is connected in series with a furnace rear injection electric valve and a furnace rear injection manual valve.

10. The coal-fired circulating fluidized bed boiler system for mixing biomass and oil sludge according to claim 1, characterized in that: The biomass pretreatment system pre-treats biomass as follows: first, the biomass is transported to the iron removal room to remove the iron blocks in the biomass, and then it is transported to the coarse crushing room and the fine crushing room in turn for crushing, and then the crushed biomass is divided into coarse biomass and fine biomass according to the size of the particle size. The particle size greater than 3cm is coarse biomass, and the particle size less than or equal to 3cm is fine biomass.

Images