CN218924311U - Biomass boiler flue gas ultralow emission integrated treatment system - Google Patents
Biomass boiler flue gas ultralow emission integrated treatment system Download PDFInfo
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- CN218924311U CN218924311U CN202222614941.7U CN202222614941U CN218924311U CN 218924311 U CN218924311 U CN 218924311U CN 202222614941 U CN202222614941 U CN 202222614941U CN 218924311 U CN218924311 U CN 218924311U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses an ultra-low emission integrated treatment system for biomass boiler flue gas, which comprises a pre-dust collector, a venturi device and a semi-dry desulfurization tower which are sequentially communicated with a boiler outlet pipeline, wherein the upper end of the CFB semi-dry desulfurization tower is provided with a desulfurizing agent unit, the lower end of the CFB semi-dry desulfurization tower is provided with a temperature regulating water unit, the venturi device is arranged at the bottom end of the CFB semi-dry desulfurization tower, an ammonia water spraying unit is arranged at an air inlet of the venturi device, and the system further comprises a material retreating unit and a circulating flue. Through reasonable coupling and integration of a denitration device and a desulfurization and dust removal device, evaporation and uniform distribution of denitration agent ammonia water are realized by utilizing a Venturi device, complex equipment such as a flue gas mixer, an ammonia water evaporator and the like in a conventional SCR denitration system are saved, a low-temperature SCR catalyst is reasonably arranged by utilizing the space inside the dust remover, other accessory equipment such as an SCR reactor and the like are saved, the arrangement is more compact, the efficient removal of NOx, SO2 and smoke dust is realized, and the standard of ultralow emission is reached.
Description
Technical Field
The utility model relates to the technical field of gaseous pollutant purification, in particular to an ultra-low emission integrated treatment system for biomass boiler smoke.
Background
Compared with the flue gas of the coal-fired boiler, the flue gas of the biomass boiler has the following characteristics:
(1) The moisture content is high, and the dew point temperature is high;
(2) The alkaline substances in the smoke dust are high in content;
(3) The HCl and HF concentrations are high;
(4) The SO2 and NOx concentrations are low, but the fluctuation is large, generally about 100-300 mg/Nm3, and can reach 300-600 mg/Nm3 when wood or bark is mixed and burned.
Through technical and economic comparison and feasibility analysis of various process routes, the prior biomass boiler generally adopts a mode of combining semi-dry desulfurization with a bag-type dust collector for desulfurization and dust removal. The denitration generally adopts SNCR, and the SNCR efficiency is lower and is generally 40% -60%, and if stable ultralow emission is to be achieved, the SCR denitration technology is required to be combined. Alkali metal in the smoke dust of the biomass boiler can influence the service life of the SCR catalyst, so that the SCR is generally positioned behind a bag-type dust collector, and a set of denitration reducing agent supply and injection system and an SCR reactor device are required to be arranged, so that ultra-low emission of NOx is realized. In addition, the newly added SCR systems require additional sites to be deployed, with certain difficulties for site-intensive power plants.
Disclosure of Invention
Aiming at the technical problems in the background art, the utility model aims to provide an integrated treatment system for ultralow emission of biomass boiler flue gas, which is used for reasonably coupling and integrating an SCR denitration system and a desulfurization and dust removal system, optimizing the system structure, saving the occupied area, realizing compact arrangement and realizing that pollutants reach the standard of ultralow emission.
The utility model adopts the following technical scheme: the biomass boiler flue gas ultra-low emission integrated treatment system comprises a pre-deduster, a venturi device and a CFB semi-dry desulfurization tower, wherein the pre-deduster, the venturi device and the CFB semi-dry desulfurization tower are sequentially communicated with a boiler outlet pipeline, a desulfurizing agent unit is arranged at the upper end of the CFB semi-dry desulfurization tower, a temperature regulating water unit is arranged at the lower end of the CFB semi-dry desulfurization tower, the venturi device is arranged at the bottom end of the CFB semi-dry desulfurization tower, and an ammonia water spraying unit is arranged at an air inlet of the venturi device;
the device comprises a CFB semi-dry desulfurization tower, a material reprocessing unit and a heat-exchanging unit, wherein the material reprocessing unit comprises a flue gas heat exchanger, a hot blast stove, a dedusting and denitration integrated device and a boiler induced draft fan, a first air inlet of the flue gas heat exchanger is communicated with an air outlet of the CFB semi-dry desulfurization tower, an air inlet of the hot blast stove is communicated with the air outlet of the flue gas heat exchanger, an air inlet of the dedusting and denitration integrated device is communicated with the air outlet of the hot blast stove, an air outlet of the dedusting and denitration integrated device is communicated with a second air inlet of the flue gas heat exchanger, and a second air outlet of the flue gas heat exchanger is communicated with the boiler induced draft fan; wherein, the bottom of the dust removal and denitration integrated device is provided with an ash bucket, one end of the returning device is communicated with an output port of the ash bucket, and the other end is communicated with the CFB semi-dry desulfurization tower; the boiler dust collector also comprises a circulating flue, one end of the circulating flue is communicated with an air outlet pipeline of the boiler induced draft fan, and the other end of the circulating flue is communicated with a pipeline between the pre-dust collector and the Venturi device.
Further, the particle size of the ammonia water sprayed by the ammonia water spraying unit is smaller than 100 mu m.
Furthermore, the liquid spraying particle size of the temperature-regulating water unit is smaller than 100 mu m, and the spraying direction is perpendicular to the flue gas flow direction.
Further, the temperature of the outlet flue gas of the CFB semi-dry desulfurization tower is controlled at 75-90 ℃.
Further, the flue gas temperature adjusting range of the flue gas heat exchanger is controlled to be 150-170 ℃, and the flue gas temperature adjusting range of the hot blast stove is controlled to be 180-200 ℃.
Furthermore, a plurality of catalytic filter bags are uniformly distributed in the dust removal and denitration integrated device, and each catalytic filter bag comprises a filter layer positioned on the outer layer and a catalytic layer positioned on the inner layer.
Further, the boiler induced draft fan adopts a variable frequency centrifugal fan.
Further, one end of the circulating flue close to the pre-dust collector and the venturi device is provided with a flue gas adjusting air door.
Compared with the prior art, the utility model has the advantages that: according to the biomass boiler flue gas ultra-low emission integrated treatment system, evaporation and uniform distribution of ammonia water serving as a denitration agent are realized by virtue of reasonable coupling and integration of a denitration device and a desulfurization and dust removal device, complex equipment such as a flue gas mixer and an ammonia water evaporator in a conventional SCR denitration system are saved, a low-temperature SCR catalyst is reasonably arranged by virtue of the space inside a dust remover, other accessory equipment such as an SCR reactor are saved, the arrangement is more compact, the efficient removal of NOx, SO2 and smoke dust is realized, and the ultra-low emission standard is reached.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an integrated treatment system for ultralow emission of biomass boiler flue gas;
wherein: 1-boiler outlet flue gas, 2-pre-deduster, 3-venturi device, 4-CFB semi-dry desulfurization tower, 5-flue gas heat exchanger, 6-hot blast furnace, 7-dust removal denitration integrated device, 8-ash bucket, 9-boiler induced draft fan, 10-circulation flue, 11-desulfurizer unit, 12-temperature adjusting water unit, 13-ammonia water spraying unit, 14-returning device, 71-catalytic filter bag and 101-flue gas damper.
Detailed Description
In the following, in order to facilitate the understanding of the technical solutions of the present utility model by a person skilled in the art, reference will be made to the accompanying drawings for further description. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the utility model. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.
Referring to fig. 1, a schematic diagram of a structure of an embodiment of an integrated treatment system for ultralow emission of flue gas of a biomass boiler according to the present utility model is provided, which includes a pre-deduster 2, a venturi device 3, a CFB semi-dry desulfurization tower 4, a material reprocessing unit and a circulation flue 10.
The pre-dust collector 2, the venturi device 3 and the CFB semi-dry desulfurization tower 4 are sequentially communicated with a boiler outlet pipeline 1, a desulfurizing agent unit 11 is arranged at the upper end of the CFB semi-dry desulfurization tower 4, a temperature adjusting water unit 12 is arranged at the lower end of the CFB semi-dry desulfurization tower 4, the venturi device 3 is arranged at the bottom end of the CFB semi-dry desulfurization tower 4, and an ammonia water spraying unit 13 is arranged at an air inlet of the venturi device 3.
The material reprocessing unit comprises a flue gas heat exchanger 5, a hot blast stove 6, a dedusting and denitration integrated device 7 and a boiler induced draft fan 9, wherein a first air inlet of the flue gas heat exchanger 5 is communicated with an air outlet of the CFB semi-dry desulfurization tower 4, an air inlet of the hot blast stove 6 is communicated with an air outlet of the flue gas heat exchanger 5, an air inlet of the dedusting and denitration integrated device 7 is communicated with an air outlet of the hot blast stove 6, an air outlet of the dedusting and denitration integrated device 7 is communicated with a second air inlet of the flue gas heat exchanger 5, and a second air outlet of the flue gas heat exchanger 5 is communicated with the boiler induced draft fan 9; wherein, the bottom of the dust removal and denitration integrated device 7 is provided with an ash bucket 8, one end of a returning device 14 is communicated with an output port of the ash bucket 8, and the other end is communicated with the CFB semi-dry desulfurization tower 4;
one end of the circulating flue 10 is communicated with an air outlet pipeline of the boiler induced draft fan 9, and the other end is communicated with a pipeline between the pre-deduster 2 and the Venturi device 3.
In the implementation process of the system, the temperature of the boiler outlet flue gas 1 is about 130-150 ℃, and the boiler outlet flue gas firstly enters the pre-deduster 2. The pre-dust collector 2 is one or a plurality of combinations of a gravity settler, an inertial dust collector and a cyclone dust collector and is used for removing unburnt sparks in the smoke of the biomass boiler, removing large-particle smoke dust, protecting the safety and stability of downstream equipment and reducing the operation load of the downstream equipment.
Further, the flue gas after the pre-dedusting treatment enters a venturi device 3, and the venturi device 3 is an important part for semi-dry desulfurization. Meanwhile, the spraying position of the ammonia water spraying unit 13 is located at the upstream of the venturi device 3, and is fully mixed with the CFB semi-dry desulfurization tower 4 through the venturi device 3, so that the ammonia concentration distribution is ensured to be uniform. The concentration of ammonia water is 5% -25%, the grain diameter of the sprayed ammonia water is less than 100 μm, and the direction is consistent with the flow direction of the flue gas. In this embodiment, the venturi device 3 replaces the flue gas mixer in a conventional SCR denitration device.
The spraying position of the temperature regulating water unit 12 is at the lower part of the CFB semi-dry desulfurization tower 4, the particle size of the introduced liquid is smaller than 100 mu m, and the spraying direction is vertical to the flue gas flow direction. The outlet flue gas temperature of the CFB semi-dry desulfurization tower 4 is controlled to be 75-90 ℃ according to different operation loads, and is generally higher than the dew point temperature of flue gas by more than 10 ℃. The SO2 concentration at the outlet of the CFB semi-dry desulfurization tower 4 is less than 35mg/Nm 3 。
The first air inlet of the flue gas heat exchanger 5 is connected with the air outlet of the CFB semi-dry desulfurization tower 4, and the purpose is to initially heat the flue gas to 150-170 ℃. The first air outlet of the flue gas heat exchanger 5 is connected with a hot blast stove 6, and the purpose is to further heat the flue gas to 180-200 ℃.
The air outlet of the hot blast stove 6 is connected with the flue gas inlet of the dust removal and denitration integrated device 7. A plurality of catalytic filter bags 71 are uniformly distributed in the dust removal and denitration integrated device 7. The catalytic filter bag 71 is divided into an inner layer structure and an outer layer structure, and comprises a filter layer positioned at the outer layer and a catalytic layer positioned at the inner layer. The filtering layer has the structure function of dust removal to control the concentration of the smoke dust entering the inner layer to be 10mg/Nm 3 In the following, catalyst poisoning can be prevented, and the denitration efficiency of the inner layer can be improved. The inner layer of the catalytic layer has the functions of catalysis, the effective component is a low-temperature SCR catalyst, and the NO outlet is ensured x Concentration < 50mg/Nm 3 。
The second air inlet of the flue gas heat exchanger 5 is connected with the flue gas outlet of the dust removal and denitration integrated device 7, and the second air outlet of the flue gas heat exchanger 5 is connected with the boiler induced draft fan 9. The temperature of the flue gas entering the boiler induced draft fan 9 is controlled to be 100-120 ℃.
The bottom of the dust removal and denitration integrated device 7 is connected with an ash bucket 8, the ash bucket 8 is in the form of a ship-shaped ash bucket, and a gasification device is arranged. The materials in the ship-shaped ash bucket can be returned into the CFB semi-dry desulfurization tower 4 through the material returning device 14, so that the underreacted desulfurizing agent can play a role again.
The boiler induced draft fan 9 is a general variable frequency centrifugal fan, and the frequency of the motor is linked with the smoke pressure value, so that the variable frequency centrifugal fan can be flexibly adapted to load change.
The circulating flue 10 is arranged according to 40% of flue gas load and is provided with a flue gas regulating air door 101 so as to ensure the running stability of the desulfurization system of the boiler under low load and meet the requirement of unit flexibility.
In addition, the system is also provided with a set of automatic control system, and a PLC controller can be adopted in specific setting. The loads of the hot blast stove 6, the boiler induced draft fan 9, the desulfurizing agent unit 11, the temperature-adjusting water unit 12, the ammonia water spraying unit 13, the returning device 14 and the flue gas adjusting air door 101 can be matched with the load adjustment of the boiler so as to realize automatic adjustment.
In summary, the biomass boiler flue gas ultra-low emission integrated treatment system designed by the utility model realizes the evaporation and uniform distribution of the denitration agent ammonia water by reasonably coupling and integrating the denitration device and the desulfurization and dust removal device and utilizes the Venturi device 3, thereby saving complex equipment such as a flue gas mixer, an ammonia water evaporator and the like in the conventional SCR denitration system, reasonably setting a low-temperature SCR catalyst by utilizing the space inside the dust remover, saving other accessory equipment such as an SCR reactor and the like, ensuring more compact arrangement, realizing the efficient removal of NOx, SO2 and smoke dust and reaching the standard of ultra-low emission.
The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.
Claims (8)
1. The biomass boiler flue gas ultra-low emission integrated treatment system is characterized by comprising a pre-deduster (2), a venturi device (3) and a CFB semi-dry desulfurization tower (4) which are sequentially communicated with a boiler outlet pipeline (1), wherein the upper end of the semi-dry desulfurization tower (4) is provided with a desulfurizing agent unit (11), the lower end of the semi-dry desulfurization tower is provided with a temperature regulating water unit (12), the venturi device (3) is arranged at the bottom end of the CFB semi-dry desulfurization tower (4), and an ammonia water spraying unit (13) is arranged at an air inlet of the venturi device (3);
the device comprises a CFB semi-dry desulfurization tower (4), a material reprocessing unit, and is characterized by further comprising a material reprocessing unit, wherein the material reprocessing unit comprises a flue gas heat exchanger (5), a hot blast stove (6), a dedusting and denitration integrated device (7) and a boiler induced draft fan (9), a first air inlet of the flue gas heat exchanger (5) is communicated with an air outlet of the CFB semi-dry desulfurization tower (4), an air inlet of the hot blast stove (6) is communicated with an air outlet of the flue gas heat exchanger (5), an air inlet of the dedusting and denitration integrated device (7) is communicated with an air outlet of the hot blast stove (6), an air outlet of the dedusting and denitration integrated device (7) is communicated with a second air inlet of the flue gas heat exchanger (5), and a second air outlet of the flue gas heat exchanger (5) is communicated with the boiler induced draft fan (9); the bottom of the dust removal and denitration integrated device (7) is provided with an ash bucket (8), one end of a returning device (14) is communicated with an output port of the ash bucket (8), and the other end of the returning device is communicated with the CFB semi-dry desulfurization tower (4);
the boiler further comprises a circulating flue (10), one end of the circulating flue (10) is communicated with an air outlet pipeline of the boiler induced draft fan (9), and the other end of the circulating flue is communicated with a pipeline between the pre-dust collector (2) and the venturi device (3).
2. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 1, wherein the particle size of the ammonia water sprayed by the ammonia water spraying unit (13) is smaller than 100 μm.
3. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 2, wherein the liquid spraying particle size of the temperature-regulating water unit (12) is smaller than 100 μm, and the spraying direction is perpendicular to the flue gas flow direction.
4. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 3, wherein the temperature of the outlet flue gas of the CFB semi-dry desulfurization tower (4) is controlled at 75-90 ℃.
5. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 4, wherein the flue gas heat exchanger (5) controls the flue gas temperature adjustment range to be 150-170 ℃, and the hot blast stove (6) controls the flue gas temperature adjustment range to be 180-200 ℃.
6. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 1, wherein a plurality of catalytic filter bags (71) are uniformly distributed in the dedusting and denitration integrated device (7), and the catalytic filter bags (71) comprise a filter layer positioned on an outer layer and a catalytic layer positioned on an inner layer.
7. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 1, wherein the boiler induced draft fan (9) adopts a variable frequency centrifugal fan.
8. The biomass boiler flue gas ultra-low emission integrated treatment system according to claim 1, wherein a flue gas damper (101) is arranged at one end of the circulating flue close to the pre-dust collector (2) and the venturi device (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222614941.7U CN218924311U (en) | 2022-09-30 | 2022-09-30 | Biomass boiler flue gas ultralow emission integrated treatment system |
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| CN202222614941.7U CN218924311U (en) | 2022-09-30 | 2022-09-30 | Biomass boiler flue gas ultralow emission integrated treatment system |
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