Flue gas treatment integrated system

Abstract

The invention relates to a flue gas treatment integrated system, in particular to a biomass or gas boiler flue gas treatment integrated system. The outlet end of the first economizer is connected with the inlet end of a cyclone dust collector, the outlet end of the cyclone dust collector is connected with the inlet end of a dust-sulfur-nitrate integrated device through a pipeline, and the pipeline at the outlet end of the cyclone dust collector is provided with an SDS desulfurization device and an SCR denitration ammonia spraying device; the SDS desulfurization device and the SCR denitration ammonia spraying device are connected with a communicating pipeline of the cyclone dust collector and the dust-sulfur-nitrate integrated device through pipelines, and the cyclone dust collector and the dust-sulfur-nitrate integrated device are structurally connected, so that the system can be suitable for various biomass boilers, and is high in equipment integration level, lower in energy consumption, smaller in occupied area, lower in cost and beneficial to popularization and application.

Description

Technical Field

[0001] The invention relates to an integrated flue gas treatment system, and in particular to an integrated flue gas treatment system for a biomass or gas boiler. Background Art

[0002] The flue gas treatment technology of biomass boilers adopts traditional desulfurization, denitrification, dust removal and high-temperature low-dust processes to meet the ultra-low emissions of nitrogen oxides, sulfur dioxide and dust. However, the traditional split construction of desulfurization towers, denitrification reactors, and bag dust collectors requires large investments and high energy consumption.

[0003] In the existing technology, in the high-temperature, low-dust and dust-nitrogen integrated + wet desulfurization process, metal filter bags are used as filter materials, and the energy consumption has certain advantages over the traditional process. However, the cost of desulfurization alone is high, and the resistance is still high during operation, resulting in a high overall cost. In addition, the equipment is relatively large and occupies a large area, making it difficult to adapt to the development needs of future biomass flue gas treatment. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated flue gas treatment system in view of the defects or shortcomings in the prior art, which combines a cyclone dust collector with a dust, sulfur and nitrate integrated device and can be applied to various biomass boilers. The equipment has high integration, lower energy consumption, smaller footprint and lower cost, which is conducive to promotion and use.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it comprises a first economizer 3, a cyclone dust collector 4, and a dust-sulfur-nitrate integrated device 5; the outlet end of the first economizer 3 is connected to the inlet end of the cyclone dust collector 4; the outlet end of the cyclone dust collector 4 is connected to the inlet end of the dust-sulfur-nitrate integrated device 5 through a pipeline; an SDS desulfurization device 6 and an SCR denitration ammonia spraying device 7 are arranged on the outlet end pipeline of the cyclone dust collector 4; the SDS desulfurization device 6 and the SCR denitration ammonia spraying device 7 are connected to the connecting pipeline of the cyclone dust collector 4 and the dust-sulfur-nitrate integrated device 5 through a pipeline.

[0006] Furthermore, a second economizer 8 is provided at the outlet end of the dust-sulfur-nitrate integrated device 5, and the inlet of the second economizer 8 is connected to the dust-sulfur-nitrate integrated device 5 through a pipeline.

[0007] Furthermore, a first bin pump 9 is provided at the bottom of the cyclone dust collector 4 , and a second bin pump 10 is provided at the bottom of the dust, sulfur and nitrate integrated device 5 .

[0008] Furthermore, the first silo pump 9 and the second silo pump 10 are connected at the bottom and connected to the ash bin 13 .

[0009] Furthermore, a conveying fan 11 is provided at the bottom of the SDS desulfurization device 6 , and the conveying fan 11 connects the SDS desulfurization device 6 with the cyclone dust collector 4 .

[0010] Furthermore, an ammonia water pump 12 is provided at the inlet end of the SCR denitration ammonia spraying device 7 , and the ammonia water pump 12 is located on the pipeline in the direction of the inlet end of the dust-sulfur-nitrate integrated device 5 .

[0011] Furthermore, two ammonia water pumps 12 are provided.

[0012] Furthermore, an induced draft fan 14 connected to a chimney 15 is provided at the outlet end of the second economizer 8 .

[0013] Furthermore, the inlet end of the first economizer 3 is connected to the superheater 2 , and the superheater 2 is connected to the furnace 1 of the biomass boiler.

[0014] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: 1. The whole system integrates dust removal, desulfurization and denitrification, is suitable for flue gas medium temperature section treatment, fully considers the working conditions of incomplete combustion of biomass, can solve the problem of traditional chemical fiber bag burning through, and realizes long-term stable operation of the equipment;

[0015] 2. During the operation of the equipment, the dust removal and desulfurization are carried out first, and the sulfur dioxide and dust are ultra-lowly discharged before denitrification, so that the catalyst can fully avoid the problem of alkali metal ash poisoning in the biomass boiler and effectively extend the service life of the catalyst;

[0016] 3. Compared with traditional SCR, bag filter, heating furnace, SCR reactor, induced draft fan and desulfurization tower process or high-temperature dust removal, SCR denitrification integration, induced draft fan, wet desulfurization process, the floor space occupied is greatly reduced;

[0017] 4. The integrated equipment has lower overall operating resistance, lower operating costs, and lower installation costs, which is conducive to improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Explanation of the reference numerals: biomass boiler furnace 1, superheater 2, first economizer 3, cyclone dust collector 4, dust-sulfur-nitrate integrated device 5, SDS desulfurization device 6, SCR denitrification ammonia injection device 7, second economizer 8, first bin pump 9, second bin pump 10, conveying fan 11, ammonia water pump 12, ash storage 13, induced draft fan 14, chimney 15. DETAILED DESCRIPTION

[0021] See also Figure 1 As shown, the technical solution adopted in this specific implementation method is: it includes a first economizer 3, a cyclone dust collector 4, and a dust, sulfur and nitrate integrated device 5. In this embodiment, the flue gas treatment equipment is mainly suitable for the medium temperature section of flue gas, and an integrated system of dust removal, desulfurization and denitrification is set. The cyclone dust collector and the dust, sulfur and nitrate integrated device are arranged in parallel, and a first economizer is arranged at the front end of the two to absorb the heat of the high-temperature flue gas, reduce the exhaust temperature of the flue gas, save energy, and improve efficiency. The flue gas then enters the cyclone dust collector to separate the flue gas and the ash, and denitrification is performed after ultra-low emissions of sulfur dioxide and dust are achieved, so that the catalyst fully avoids the problem of alkali metal ash poisoning in the biomass boiler and effectively prolongs the service life of the catalyst;

[0022] Specifically, the outlet end of the first economizer 3 is connected to the inlet end of the cyclone dust collector 4, and the outlet end of the cyclone dust collector 4 is connected to the inlet end of the dust-sulfur-nitrate integrated device 5 through a pipeline. The outlet end pipeline of the cyclone dust collector 4 is provided with an SDS desulfurization device 6 and an SCR denitration ammonia spraying device 7. The SDS desulfurization device 6 and the SCR denitration ammonia spraying device 7 are connected to the connecting pipeline of the cyclone dust collector 4 and the dust-sulfur-nitrate integrated device 5 through a pipeline. In this embodiment, a dual-purpose grid for spraying desulfurization and denitration ammonia spraying is provided at the outlet of the cyclone dust collector, and the pipeline is connected through the dual-purpose grid, wherein the spraying desulfurization grid pipeline is connected to the SDS desulfurization device, and when the flue gas passes through, the SDS desulfurization device performs a spraying desulfurization process treatment, and the flue gas after the treatment is continuously transported to the position of the SCR denitration ammonia spraying device, and the SCR denitration ammonia spraying device performs denitration ammonia spraying treatment, and in this embodiment In the invention, an ammonia water pump 12 is arranged at the inlet end of the SCR denitration ammonia spraying device 7. The ammonia water pump 12 is located on the pipeline in the direction of the inlet end of the dust-sulfur-nitrate integrated device 5 and is located in the denitration ammonia spraying grid. Two ammonia water pumps 12 are arranged, one of which is an SDS baking soda desulfurization supply device and the other is an SCR denitration ammonia spraying supply device, which cooperates with the SCR denitration ammonia spraying device to work. By setting up an integrated processing system, it can be effectively applied to biomass boilers of various sizes, with better practicality, and the integrated system equipment occupies a smaller area. Compared with the traditional SCR, bag dust collector, heating furnace, SCR reactor, induced draft fan and desulfurization tower process system, the area occupied is reduced by 80%, and compared with high-temperature dust removal, SCR denitration integration, induced draft fan and wet desulfurization process, the area occupied is reduced by 50%, which improves land utilization and reduces production costs.

[0023] To be more specific, a second economizer 8 is provided at the outlet end of the dust, sulfur and nitrate integrated device 5, and the inlet of the second economizer 8 is connected to the dust, sulfur and nitrate integrated device 5 through a pipeline. In this embodiment, in order to further reduce energy consumption and improve efficiency, a second economizer is also provided. The segmented economizer system setting can better reduce energy consumption and achieve the purpose of energy saving and emission reduction.

[0024] To be more specific, a first bin pump 9 is provided at the bottom of the cyclone dust collector 4, and a second bin pump 10 is provided at the bottom of the dust, sulfur and saltpeter integrated device 5. The bottoms of the first bin pump 9 and the second bin pump 10 are connected to each other and connected to the ash bin 13. During the operation of traditional equipment, there is a problem of large operating resistance when the equipment cooperates, especially when separating and transporting ash. Therefore, in this embodiment, two bin pump structures are set as bottom pneumatic conveying devices to realize integrated conveying, speed up the ash collection and conveying speed, and reduce the equipment operation resistance.

[0025] More specifically, a conveying fan 11 is provided at the bottom of the SDS desulfurization device 6, and the conveying fan 11 connects the SDS desulfurization device 6 and the cyclone dust collector 4. Similarly, by providing a conveying fan, the system operation resistance can be better reduced, the spray desulfurization speed can be accelerated, and the overall process processing efficiency can be accelerated.

[0026] More specifically, the outlet end of the second economizer 8 is provided with an induced draft fan 14 connected to the chimney 15. Similarly, by providing the induced draft fan, the emission rate of the treated flue gas can be increased, the system operation resistance can be reduced, the energy consumption can be reduced, and the efficiency can be improved.

[0027] To be more specific, the inlet end of the first economizer 3 is connected to the superheater 2 , and the superheater 2 is connected to the furnace 1 of the biomass boiler.

[0028] The working principle of the present invention is as follows: a segmented first economizer 3 and a second economizer 8 are used in conjunction with a cyclone dust collector 4 and a dust-sulfur-nitrate integrated device 5 to operate, so that the segmented economizer is integrated with the cyclone dust removal and fine dust removal, denitrification, and dry desulfurization processes. The mixed flue gas enters the first economizer 3 from the superheater 2, and the flue gas transported from the first economizer 3 enters the cyclone dust collector 4, and is separated by the cyclone dust collector 4. The dust falls to the bottom and is transported to the ash storage 13 through the first bin pump 9. The flue gas separated by the cyclone dust collector 4 is output from the outlet to the SDS desulfurization device 6, and in During the transportation process, the SDS desulfurization device 6 performs preliminary desulfurization treatment through the conveying fan 11. The flue gas continues to be transported after the desulfurization treatment. When it reaches the SCR denitrification ammonia spraying device 7, it is desulfurized and denitrified by ammonia spraying through the ammonia water pump 12. The flue gas after being treated again enters the dust-sulfur-nitrate integrated device 5, and after complete desulfurization and denitrification, it enters the second economizer 8 and is discharged into the chimney through the induced draft fan 15, thereby completing the treatment of the flue gas and achieving environmental protection. The dust separated in the dust-sulfur-nitrate integrated device 5 is transported to the ash storage by the second bin pump 10.

[0029] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An integrated flue gas treatment system, characterized in that: It comprises a first economizer (3), a cyclone dust collector (4), and a dust, sulfur and nitrate integrated device (5). The outlet end of the first economizer (3) is connected to the inlet end of the cyclone dust collector (4). The outlet end of the cyclone dust collector (4) is connected to the inlet end of the dust, sulfur and nitrate integrated device (5) through a pipeline. The outlet end pipeline of the cyclone dust collector (4) is provided with an SDS desulfurization device (6) and an SCR denitration and ammonia injection device (7). The SDS desulfurization device (6) and the SCR denitration and ammonia injection device (7) are connected to the cyclone dust collector (4) and the connecting pipeline of the dust, sulfur and nitrate integrated device (5) through a pipeline.

2. The integrated flue gas treatment system according to claim 1, characterized in that: The dust, sulfur and nitrate integrated device (5) is provided with a second economizer (8) at the outlet end, and the inlet of the second economizer (8) is connected to the dust, sulfur and nitrate integrated device (5) through a pipeline.

3. The integrated flue gas treatment system according to claim 1 is characterized in that: A first bin pump (9) is arranged at the bottom of the cyclone dust collector (4), and a second bin pump (10) is arranged at the bottom of the dust, sulfur and nitrate integrated device (5).

4. The integrated flue gas treatment system according to claim 3 is characterized in that: The first silo pump (9) and the second silo pump (10) are connected at the bottom and connected to the ash storage (13).

5. The integrated flue gas treatment system according to claim 1 is characterized in that: A conveying fan (11) is arranged at the bottom of the SDS desulfurization device (6), and the conveying fan (11) connects the SDS desulfurization device (6) and the cyclone dust collector (4).

6. The integrated flue gas treatment system according to claim 1, characterized in that: The inlet end of the SCR denitration ammonia spraying device (7) is provided with an ammonia water pump (12), and the ammonia water pump (12) is located on the pipeline in the direction of the inlet end of the dust, sulfur and nitrate integrated device (5).

7. The integrated flue gas treatment system according to claim 6, characterized in that: Two ammonia water pumps (12) are provided.

8. The integrated flue gas treatment system according to claim 2, characterized in that: The outlet end of the second economizer (8) is provided with an induced draft fan (14) connected to a chimney (15).

9. The integrated flue gas treatment system according to claim 1, characterized in that: The inlet end of the first economizer (3) is connected to the superheater (2), and the superheater (2) is connected to the furnace (1) of the biomass boiler.

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