Dust and nitrate integrated flue gas ultralow emission device for biomass fluidized bed boiler power plant

Abstract

A dust and nitrate integrated flue gas ultralow emission device for a biomass fluidized bed boiler power plant comprises a biomass fluidized bed boiler, a coal economizer, a cyclone dust collector, a CFB dry deacidification tower, a denitration and dust removal integrated device, an induced draft fan and a chimney which are sequentially connected. The ammonia spraying device is arranged on the upper portion of the biomass fluidized bed boiler, one end of the main flue gas pipeline is connected with the economizer, the other end of the main flue gas pipeline is connected with the cyclone dust collector, one end of the high-temperature flue gas branch pipe is connected with the biomass fluidized bed boiler, and the other end of the high-temperature flue gas branch pipe is connected with the slaked lime adding device. The other end of the main flue gas pipeline is connected to the downstream of the main flue gas pipeline, the slaked lime feeding device is communicated with the venturi throat part of the CFB dry-process deacidification tower, and the baking soda grinding device is connected with the joint of the CFB dry-process deacidification tower and the denitration and dust removal integrated device through a pipeline. The flue gas filtering device can ensure that flue gas meets the ultra-low emission requirement and reaches the emission standard, the boiler efficiency can be improved, and the long-period operation time can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of flue gas purification technology of biomass fluidized bed boiler power plant, and specifically relates to an ultra-low emission device of flue gas with integrated dust and saltpeter of biomass fluidized bed boiler power plant. Background Art

[0002] Due to the environmental protection cost and the low original emission requirements, the domestic biomass fluidized bed boiler power plants generally adopt the method of SNCR denitrification + CFB dry deacidification tower desulfurization + bag dust removal. However, the denitrification efficiency of CFB dry deacidification tower and SNCR is low, and it is impossible to achieve the current ultra-low emission (particles ≤ 10 mg / Nm 3 , sulfur dioxide ≤35 mg / Nm 3 , nitrogen oxides ≤50mg / Nm 3 , ammonia slip (SNCR+SCR) ≤ 3.8 mg / Nm 3 ), so fluidized bed biomass power plants are facing the need for ultra-low emission transformation.

[0003] The existing flue gas treatment of biomass fluidized bed boiler power plants adopts the method of "SNCR denitrification + CFB desulfurization tower + bag dust removal". The denitrification and deacidification efficiency is low and cannot meet the ultra-low emission requirements of flue gas. When the sulfur content in the raw materials is high, the acidic gas generated cannot be effectively removed, which will cause corrosion of the bag dust collector and subsequent equipment, affecting the long-term operation of the equipment. At present, the traditional ultra-low emission scheme of biomass fluidized bed boiler power plants is: SDS baking soda desulfurization + bag dust removal + flue gas heating + SCR catalytic reaction tower denitrification, but the cost of baking soda deacidification in the traditional ultra-low emission process is very high, which will lead to a surge in environmental protection operation costs. In addition, in order to adapt to the reaction temperature of SCR, the flue gas temperature before the SCR catalytic reaction tower needs to be increased. Generally, steam heating or direct heating with fuels such as natural gas is used, which leads to a surge in flue gas heating costs. The newly added flue gas heating device and SCR reaction tower require a certain amount of space, and it is difficult to arrange them on site. Once the site is insufficient, it will bring great difficulties to the layout of the new equipment. The new equipment will greatly increase the flue gas resistance, resulting in increased power consumption of the induced draft fan. Once the induced draft fan capacity is insufficient, there is also the risk of replacing or modifying the induced draft fan, resulting in increased modification costs.

[0004] Therefore, a new process suitable for ultra-low emission transformation of biomass fluidized bed boiler power plants is urgently needed to solve the above problems. Utility Model Content

[0005] Technical problems to be solved: In view of the problems that the existing transformation schemes in the prior art can meet the ultra-low emission requirements, the transformation intensity is large, the investment cost is high, the operating cost is high, the flue gas heating consumes a lot of energy, the flue gas resistance is increased, the new equipment occupies the site, affects the layout of the flue gas waste heat equipment, the shutdown time is long, and the normal production and operating efficiency of the power plant are greatly affected. The utility model provides a biomass fluidized bed boiler power plant dust and saltpeter integrated flue gas ultra-low emission device, which can not only ensure that the flue gas meets the ultra-low emission requirements and meets the emission standards, but also improve the boiler efficiency and increase the long-term operation time.

[0006] Technical solution: A biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device, comprising a biomass fluidized bed boiler and an economizer connected in sequence, wherein the flue gas outlet of the biomass fluidized bed boiler is connected to the economizer pipeline, and the biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device also includes an ammonia injection device, a main flue gas pipeline, a high-temperature flue gas branch pipe, a cyclone dust collector, a CFB dry deacidification tower, a slaked lime dosing device, a baking soda grinding device, a denitrification and dust removal integrated device, an induced draft fan and a chimney. The ammonia injection device is arranged on the upper part of the biomass fluidized bed boiler, and is used to spray ammonia water into the biomass fluidized bed boiler. One end of the main flue gas pipeline is connected to the flue gas outlet of the economizer, and the other end is connected to the flue gas outlet of the cyclone dust collector. The flue gas inlet of the CFB dry deacidification tower is connected, one end of the high-temperature flue gas branch pipe is connected to the flue gas outlet of the biomass fluidized bed boiler, and the other end is connected to the downstream of the main flue gas pipeline, the flue gas inlet of the CFB dry deacidification tower is connected to the flue gas outlet pipeline of the cyclone dust collector 4, the slaked lime dosing device is connected to the Venturi throat of the CFB dry deacidification tower, and is used to add slaked lime into the CFB dry deacidification tower, the flue gas inlet of the integrated denitrification and dust removal device is connected to the flue gas outlet pipeline of the CFB dry deacidification tower, the baking soda grinding device is connected to the pipeline at the connection between the CFB dry deacidification tower and the integrated denitrification and dust removal device, and is used to transport baking soda to the integrated denitrification and dust removal device, and the flue gas outlet of the integrated denitrification and dust removal device is connected to the pipeline at the bottom of the chimney through the induced draft fan.

[0007] Preferably, the biomass fluidized bed boiler power plant integrated flue gas ultra-low emission device also includes a high-temperature flue gas regulating valve and an original flue gas regulating valve. The high-temperature flue gas regulating valve is arranged upstream of the high-temperature flue gas branch pipe to adjust the high-temperature flue gas flow in the high-temperature flue gas branch pipe. The original flue gas regulating valve is arranged upstream of the main flue gas duct to adjust the gas flow in the main flue gas duct. The temperature of the flue gas entering the cyclone dust collector is adjusted by the high-temperature flue gas regulating valve and the original flue gas regulating valve.

[0008] Preferably, the biomass fluidized bed boiler power plant integrated dust and nitrate flue gas ultra-low emission device also includes a waste heat recovery device, which is arranged in the middle of the pipeline connecting the integrated denitrification and dust removal device and the induced draft fan to recover waste heat.

[0009] Preferably, the grinding fineness of the baking soda grinding device is 600-700 mesh.

[0010] Preferably, the particle size of the slaked lime in the slaked lime adding device is 250 meshes.

[0011] Preferably, the ammonia injection device is a SNCR ammonia water injection device.

[0012] Beneficial effects: The present invention innovatively invents an ultra-low emission device for flue gas integrated with dust and nitrate in a biomass fluidized bed boiler power plant, which ensures the long-term stable operation of the flue gas treatment equipment and achieves ultra-low emission of flue gas.

[0013] Compared with the traditional flue gas ultra-low emission treatment method, the present invention has the following advantages:

[0014] 1. The transformation is simple and does not require the occupation of new sites, which greatly facilitates the ultra-low emission transformation of biomass grate furnace power plants.

[0015] 2. The process is short, does not increase the smoke resistance, does not need to modify the induced draft fan, and saves investment costs.

[0016] 3. The flue gas is heated by mixing the high-temperature flue gas branch with the original flue gas, without consuming additional steam or fuel, which greatly saves energy loss and reduces operating costs.

[0017] 3. SNCR + dust and nitrate integrated filter bag, the filter bag has high denitrification efficiency and low ammonia escape value, which fully meets the emission requirements of nitrogen oxides and ammonia escape; and the denitrification agent of the denitrification filter bag can be provided by the SNCR system, eliminating the need for ammonia evaporation, dilution and ammonia spraying equipment, saving investment costs.

[0018] 4. The two-stage deacidification of slaked lime + SDS baking soda can not only meet the ultra-low emission requirements of sulfur dioxide, but also save the consumption of baking soda and reduce operating costs.

[0019] 5. There is no traditional SCR catalytic reaction tower, which saves flue space and is conducive to the layout of subsequent waste heat recovery.

[0020] 6. Adjusting valves are installed on both the high-temperature flue gas and the original flue pipes, which is conducive to rapid temperature rise when starting the furnace, reducing the corrosion of the low-temperature flue gas on the dust collector, the risk of bag sticking, and quickly improving the denitrification efficiency of the denitrification filter bags.

[0021] 7. Add a waste heat recovery device after the integrated dust removal and denitrification equipment to reduce the flue gas temperature to about 110°C, which is 30~60°C lower than the existing flue gas temperature (140~170°C), equivalent to improving the boiler efficiency by 2~4 points, greatly saving biomass fuel.

[0022] 8. The transformation intensity is low and the shutdown time is very short, which greatly reduces the production losses caused by shutdown.

[0023] 9. The transformation investment cost is low and the environmental protection operation cost is controllable, which is very suitable for the current ultra-low emission transformation project of biomass fluidized bed boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device described in the utility model.

[0025] The numbers in the figure represent the following: 1. Ammonia injection device; 2. Biomass fluidized bed boiler; 2-1. Main flue gas duct; 2-2. High-temperature flue gas branch pipe; 2-3. High-temperature flue gas regulating valve; 2-4. Raw flue gas regulating valve; 3. Economizer; 4. Cyclone dust collector; 5. CFB dry deacidification tower; 6. Hydrated lime dosing device; 7. Baking soda grinding device; 8. Integrated denitrification and dust removal device; 9. Waste heat recovery device; 10. Draft fan; 11. Chimney. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] A biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device, such as Figure 1 As shown, it includes an ammonia injection device 1, a biomass fluidized bed boiler 2, a main flue gas duct 2-1, a high-temperature flue gas branch pipe 2-2, an economizer 3, a cyclone dust collector 4, a CFB dry deacidification tower 5, a slaked lime dosing device 6, a baking soda grinding device 7, an integrated denitrification and dust removal device 8, an induced draft fan 10 and a chimney 11.

[0028] Among them, the flue gas outlet of the biomass fluidized bed boiler 2 is connected to the economizer 3 pipeline. The biomass fluidized bed boiler 2 includes a boiler body, a feed port (biomass fuel feed port) arranged on one side of the bottom of the boiler body, a slag outlet arranged at the bottom end of the boiler body, an air outlet and a returner arranged on one side of the top of the boiler body, the returner inlet is connected to the air outlet pipeline, the bottom discharge port is connected to the feed port pipeline on the other side of the bottom of the boiler body, and the top air outlet of the returner is connected to the economizer 3 pipeline (the flue gas generated by the biomass fluidized bed boiler 2 comes out of the top air outlet with unburned materials, passes through the returner, and the flue gas is discharged from the top through the economizer 3, and the unburned materials return to the furnace from the bottom of the returner and are re-burned).

[0029] The ammonia injection device 1 is arranged on the upper part of the biomass fluidized bed boiler 2, and is used to inject ammonia water into the biomass fluidized bed boiler 2. One end of the main flue gas pipeline 2-1 is connected to the flue gas outlet of the economizer 3, and the other end is connected to the flue gas inlet of the cyclone dust collector 4. One end of the high-temperature flue gas branch pipe 2-2 is connected to the flue gas outlet of the biomass fluidized bed boiler 2, and the other end is connected to the downstream of the main flue gas pipeline 2-1. The flue gas inlet of the CFB dry deacidification tower 5 is connected to the flue gas outlet pipeline of the cyclone dust collector 4. The slaked lime dosing device 6 is connected to the C The Venturi throat of the FB dry deacidification tower 5 is connected to add slaked lime into the CFB dry deacidification tower 5. The flue gas inlet of the integrated denitrification and dust removal device 8 is connected to the flue gas outlet pipeline of the CFB dry deacidification tower 5. The baking soda grinding device 7 is connected to the pipeline at the connection between the CFB dry deacidification tower 5 and the integrated denitrification and dust removal device 8 to transport baking soda to the integrated denitrification and dust removal device 8. The flue gas outlet of the integrated denitrification and dust removal device 8 is connected to the bottom pipeline of the chimney 11 through the induced draft fan 10.

[0030] As one of the preferred embodiments of the present invention, the integrated ultra-low emission device for flue gas of the biomass fluidized bed boiler power plant also includes a high-temperature flue gas regulating valve 2-3 and an original flue gas regulating valve 2-4. The high-temperature flue gas regulating valve 2-3 is arranged upstream of the high-temperature flue gas branch pipe 2-2, and is used to adjust the high-temperature flue gas flow in the high-temperature flue gas branch pipe 2-2. The original flue gas regulating valve 2-4 is arranged upstream of the main flue gas pipe 2-1, and is used to adjust the gas flow in the main flue gas pipe 2-1. The temperature of the flue gas entering the cyclone dust collector 4 is adjusted by the high-temperature flue gas regulating valve 2-3 and the original flue gas regulating valve 2-4.

[0031] As one of the preferred embodiments of the present invention, the biomass fluidized bed boiler power plant integrated flue gas ultra-low emission device also includes a waste heat recovery device 9, and the waste heat recovery device 9 is arranged in the middle of the pipeline connecting the denitrification and dust removal integrated device 8 and the induced draft fan 10.

[0032] As one of the preferred embodiments of the present invention, the grinding fineness of the baking soda grinding device 7 is 600-700 meshes.

[0033] As one of the preferred embodiments of the present invention, the particle size of the slaked lime in the slaked lime adding device 6 is 250 meshes.

[0034] As one of the preferred embodiments of the present invention, the ammonia injection device 1 is a SNCR ammonia water injection device.

[0035] In the embodiments of this specification, the economizer 3 and the waste heat recovery device 9 are both heat exchangers used for heat exchange, which is not the inventive point of the device described in the present invention, so the details are not expanded, as long as the heat exchange effect can be achieved.

[0036] The grinding fineness of baking soda in the baking soda grinding device 7 is 600-700 meshes.

[0037] The particle size of the slaked lime in the slaked lime adding device 6 is 250 mesh. In this embodiment, the slaked lime adding device is specifically a screw blower.

[0038] The denitration and dust removal integrated device 8 is specifically a denitration filter bag. The denitration catalyst in the filter bag is a medium-low temperature SCR catalyst.

[0039] Before the transformation, the original biomass fluidized bed boiler power plant includes a biomass fluidized bed boiler 2, an economizer 3, a main flue gas pipeline 2-1, an original flue gas regulating valve 2-4, a cyclone dust collector 4, an induced draft fan 10 and a chimney 11 which are connected in sequence, wherein the flue gas outlet of the biomass fluidized bed boiler 2 is connected to the pipeline of the economizer 3. The ammonia water in the SNCR ammonia water injection device is provided by the original SNCR system. Example 1

[0040] In this embodiment, a biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device is provided. Figure 1 As shown, it includes an ammonia injection device 1, a biomass fluidized bed boiler 2, a main flue gas duct 2-1, a high-temperature flue gas branch pipe 2-2, a high-temperature flue gas regulating valve 2-3, a raw flue gas regulating valve 2-4, an economizer 3, a cyclone dust collector 4, a CFB dry deacidification tower 5, a slaked lime dosing device 6, a baking soda grinding device 7, a denitrification and dust removal integrated device 8, a waste heat recovery device 9, an induced draft fan 10 and a chimney 11.

[0041] The flue gas outlet of the biomass fluidized bed boiler 2 is connected to the economizer 3 pipeline. The biomass fluidized bed boiler 2 includes a boiler body, a feed port arranged at one side of the bottom of the boiler body, a slag outlet arranged at the bottom end of the boiler body, an air outlet and a returner arranged at one side of the top of the boiler body, the returner inlet is connected to the air outlet pipeline, the bottom discharge port is connected to the feed port pipeline on the other side of the bottom of the boiler body, and the top air outlet of the returner is connected to the economizer 3 pipeline.

[0042] The ammonia injection device 1 is arranged on the upper part of the biomass fluidized bed boiler 2, and is used to inject ammonia water into the biomass fluidized bed boiler 2. One end of the main flue gas pipeline 2-1 is connected to the flue gas outlet of the economizer 3, and the other end is connected to the flue gas inlet of the cyclone dust collector 4. One end of the high-temperature flue gas branch pipe 2-2 is connected to the flue gas outlet of the biomass fluidized bed boiler 2, and the other end is connected to the downstream of the main flue gas pipeline 2-1. The high-temperature flue gas regulating valve 2-3 is arranged upstream of the high-temperature flue gas branch pipe 2-2, and is used to adjust the high-temperature flue gas flow in the high-temperature flue gas branch pipe 2-2. The original flue gas regulating valve 2-4 is arranged upstream of the main flue gas pipeline 2-1, and is used to adjust the gas flow in the main flue gas pipeline 2-1. The temperature of the flue gas entering the cyclone dust collector 4 is adjusted by the high-temperature flue gas regulating valve 2-3 and the original flue gas regulating valve 2-4.

[0043] The flue gas inlet of the CFB dry deacidification tower 5 is connected to the flue gas outlet pipeline of the cyclone dust collector 4, the slaked lime adding device 6 is connected to the venturi throat of the CFB dry deacidification tower 5, and is used to add slaked lime to the inside of the CFB dry deacidification tower 5, the flue gas inlet of the denitration and dust removal integrated device 8 is connected to the flue gas outlet pipeline of the CFB dry deacidification tower 5, the baking soda grinding device 7 is connected to the pipeline at the connection between the CFB dry deacidification tower 5 and the denitration and dust removal integrated device 8, and is used to transport baking soda to the denitration and dust removal integrated device 8, and the flue gas outlet of the denitration and dust removal integrated device 8 is connected to the bottom pipeline of the chimney 11 through the induced draft fan 10. The waste heat recovery device 9 is arranged in the middle of the pipeline connecting the denitration and dust removal integrated device 8 and the induced draft fan 10.

[0044] Based on the above-mentioned method for using the integrated ultra-low emission device for flue gas of a biomass fluidized bed boiler power plant, the specific steps are as follows: ammonia water is sprayed into the upper part of the furnace of the biomass fluidized bed boiler 2 through an ammonia spraying device 1 (the ammonia concentration in this embodiment is 20wt%). The amount of ammonia water can be adjusted according to the amount of nitrogen oxides in the flue gas. The sprayed ammonia water can remove a part of the nitrogen oxides and provide a deamination agent - ammonia gas for the subsequent integrated denitrification and dust removal device 8, eliminating the need for ammonia evaporation, dilution and ammonia spraying equipment, and saving investment costs. The device draws out a high-temperature flue gas in front of the economizer 3, with a temperature of about 500°C, passes through the high-temperature flue gas branch pipe 2-2, and merges with the main flue gas pipeline 2-1 (the main flue gas temperature is about 140°C) in front of the cyclone dust collector 4. A high-temperature flue gas regulating valve 2-3 is arranged on the high-temperature flue gas branch pipe 2-2, and an original flue gas regulating valve 2-4 is arranged on the main flue gas pipeline 2-1. In this embodiment, the high-temperature flue gas regulating valve 2-3 and the original flue gas regulating valve 2-4 are electric regulating valves, which are connected to the PCL control system. The flue gas temperature is adjusted to 200~220°C through the cooperation of the high-temperature flue gas regulating valve 2-3 and the original flue gas regulating valve 2-4, and the nitrogen oxide content of the original flue gas is about 80~150 mg / Nm 3 , dust is about 15000 mg / Nm 3 , ammonia escape seriously exceeded the standard.

[0045] After the mixed flue gas enters the cyclone dust collector 4 for pre-dust removal, the dust is discharged from the bottom of the cyclone dust collector 4, and the mixed flue gas enters the CFB dry deacidification tower 5. At the venturi throat of the dry deacidification tower, slaked lime powder is sprayed through the slaked lime dosing device 6. The fineness of the slaked lime powder is about 250 mesh. The amount of slaked lime can be adjusted according to the content of acidic gas in the flue gas to ensure that the sulfur dioxide in the flue gas after slaked lime deacidification is about 50~80 mg / Nm 3 The dry deacidification tower can remove most of the hydrochloric acid gas and part of the sulfuric acid dioxide gas.

[0046] At the rear of the dry deacidification tower, baking soda is added through the baking soda grinding device 7. After being ground by the baking soda grinding device 7, the fineness of the baking soda can reach 600~700 mesh. The ultra-fine baking soda powder has a very high deacidification efficiency at the smoke temperature (200-220℃) here, which can ensure that sulfur dioxide is removed to ≤35 mg / Nm 3 , which not only meets the requirements of ultra-low sulfur dioxide emission, but also ensures the normal operation of the subsequent denitrification and dust removal integrated device 8. The flue gas after deacidification enters the denitrification and dust removal integrated device 8. The denitrification catalyst of the denitrification and dust removal integrated device 8 is specially formulated for biomass flue gas and is fully adapted to the environment of high alkalinity and high reducing gas content of biomass flue gas. At this flue gas temperature (200-220℃), the denitrification efficiency of the denitrification filter bag can reach about 85~90%, and the ammonia escape is extremely low. The nitrogen oxides of the flue gas after denitrification and dust removal are ≤50 mg / Nm 3 , dust ≤10 mg / Nm 3 , ammonia escape ≤ 3.8 mg / Nm 3 , fully meeting the ultra-low emission requirements. The flue gas that meets the standards is recovered through the waste heat recovery device 9 set in the subsequent flue gas, and the flue gas temperature drops to about 110°C. The recovered flue gas waste heat can be used to heat the supply air or heat the steam condensate. The waste heat is recovered to the boiler system, which improves the boiler efficiency. The cooled flue gas is pressurized by the induced draft fan 10 and then discharged through the chimney 11 in compliance with the standards.

[0047] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device, comprising a biomass fluidized bed boiler (2) and an economizer (3) connected in sequence, wherein: The flue gas outlet of the biomass fluidized bed boiler (2) is connected to the economizer (3) through a pipeline, and is characterized in that the biomass fluidized bed boiler power plant integrated flue gas ultra-low emission device further comprises an ammonia spraying device (1), a main flue gas pipeline (2-1), a high-temperature flue gas branch pipe (2-2), a cyclone dust collector (4), a CFB dry deacidification tower (5), a slaked lime dosing device (6), a baking soda grinding device (7), a denitrification and dust removal integrated device (8), an induced draft fan (10) and a chimney (11). The ammonia spraying device (1) is arranged on the upper part of the biomass fluidized bed boiler (2) and is used to spray ammonia water into the biomass fluidized bed boiler (2). One end of the main flue gas pipeline (2-1) is connected to the flue gas outlet of the economizer (3), and the other end is connected to the flue gas inlet of the cyclone dust collector (4). One end of the high-temperature flue gas branch pipe (2-2) is connected to the flue gas outlet of the economizer (3), and the other end is connected to the flue gas inlet of the cyclone dust collector (4). The flue gas outlet of the biomass fluidized bed boiler (2) is connected, and the other end is connected to the downstream of the main flue gas pipeline (2-1). The flue gas inlet of the CFB dry deacidification tower (5) is connected to the flue gas outlet pipeline of the cyclone dust collector (4). The slaked lime adding device (6) is connected to the venturi throat of the CFB dry deacidification tower (5) and is used to add slaked lime into the CFB dry deacidification tower (5). The flue gas inlet of the integrated denitration and dust removal device (8) is connected to the flue gas outlet pipeline of the CFB dry deacidification tower (5). The baking soda grinding device (7) is connected to the pipeline at the connection between the CFB dry deacidification tower (5) and the integrated denitration and dust removal device (8) and is used to transport baking soda to the integrated denitration and dust removal device (8). The flue gas outlet of the integrated denitration and dust removal device (8) is connected to the bottom pipeline of the chimney (11) through the induced draft fan (10).

2. The ultra-low emission device for integrated flue gas of biomass fluidized bed boiler power plant according to claim 1 is characterized in that: The biomass fluidized bed boiler power plant integrated flue gas ultra-low emission device also includes a high-temperature flue gas regulating valve (2-3) and an original flue gas regulating valve (2-4). The high-temperature flue gas regulating valve (2-3) is arranged upstream of the high-temperature flue gas branch pipe (2-2) and is used to adjust the high-temperature flue gas flow in the high-temperature flue gas branch pipe (2-2). The original flue gas regulating valve (2-4) is arranged upstream of the main flue gas pipeline (2-1) and is used to adjust the gas flow in the main flue gas pipeline (2-1). The temperature of the flue gas entering the cyclone dust collector (4) is adjusted by the high-temperature flue gas regulating valve (2-3) and the original flue gas regulating valve (2-4).

3. The ultra-low emission device for integrated flue gas of biomass fluidized bed boiler power plant according to claim 1 is characterized in that: The biomass fluidized bed boiler power plant integrated flue gas ultra-low emission device also includes a waste heat recovery device (9), and the waste heat recovery device (9) is arranged in the middle of the pipeline connecting the integrated denitration and dust removal device (8) and the induced draft fan (10).

4. The ultra-low emission device for integrated flue gas of biomass fluidized bed boiler power plant according to claim 1 is characterized in that: The baking soda grinding device (7) has a grinding fineness of 600-700 meshes.

5. The integrated ultra-low emission device for flue gas of a biomass fluidized bed boiler power plant according to claim 1 is characterized in that: The particle size of the slaked lime in the slaked lime dosing device (6) is 250 meshes.

6. The biomass fluidized bed boiler power plant dust and nitrate integrated flue gas ultra-low emission device according to claim 1 is characterized in that: The ammonia injection device (1) is a SNCR ammonia water injection device.

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