CN216799374U - Biomass boiler flue gas administers minimum discharge system - Google Patents
Biomass boiler flue gas administers minimum discharge system Download PDFInfo
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- CN216799374U CN216799374U CN202122929856.5U CN202122929856U CN216799374U CN 216799374 U CN216799374 U CN 216799374U CN 202122929856 U CN202122929856 U CN 202122929856U CN 216799374 U CN216799374 U CN 216799374U
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Abstract
The utility model provides a biomass boiler flue gas treatment ultralow emission system which comprises a boiler, a ceramic fiber catalytic dust collector, a CFB (circulating fluid bed) absorption tower, a bag type dust collector, an induced draft fan and a chimney, wherein an outlet of the economizer of the boiler is connected with an inlet of the ceramic fiber catalytic dust collector through an economizer leading-out flue, an outlet of the ceramic fiber catalytic dust collector is connected with an inlet of the CFB absorption tower, flue gas subjected to dust removal and denitration by the ceramic fiber catalytic dust collector is introduced into the CFB absorption tower for desulfurization, the CFB absorption tower is connected with the bag type dust collector through a first outlet flue, an outlet of the bag type dust collector is connected with the chimney through the induced draft fan, and clean flue gas subjected to dust removal by the bag type dust collector is discharged into the atmosphere through the induced draft fan and the chimney. The ceramic fiber catalytic dust removal and CFB semi-dry desulfurization process is applied to biomass flue gas treatment as a core, and can realize ultralow emission of NOx, sulfur dioxide and dust, thereby achieving the purpose of efficiently purifying the flue gas.
Description
[ technical field ] A
The utility model relates to the technical field of biomass flue gas purification treatment, in particular to an ultralow emission system for biomass boiler flue gas treatment.
[ background ] A method for producing a semiconductor device
The biomass boiler is a kind of boiler, and the boiler using biomass energy as fuel is called biomass boiler. The efficiency of the biomass boiler is generally over 80 percent and is 15 percent higher than the average efficiency level of a coal-fired boiler. But still releases a large amount of dust-containing flue gas after combustion, and if the dust-containing flue gas is directly discharged into the atmosphere, certain pollution is caused to the environment. In the prior art, the following modes are mostly adopted for purifying the flue gas:
1. cloth bag, activated carbon denitration and wet desulphurization;
2. SNCR, cloth bag, oxidation denitration and wet desulphurization;
3. a rotary spraying, semi-dry desulfurization, cloth bag, GGH and low-temperature denitration process;
4. a dry method (SDS) + ceramic fiber dedusting and denitration process.
The above-mentioned flue gas purification methods have certain drawbacks: when the activated carbon dry desulfurization and denitrification process is adopted, the materials are easy to burn, the temperature drop of the flue gas is large, and the one-time investment and operation cost are high. When the processes of SNCR, cloth bag, oxidation denitration and wet desulphurization are adopted, waste water is generated and has high chlorine content, so that the chimney is subjected to acid corrosion. When the calcium-based SDA semi-dry desulfurization, dedusting and medium-low temperature SCR denitration process is adopted, the occupied area is large, and the energy consumption is high. When the dry method (SDS) + ceramic fiber tube process is adopted, the sodium-based consumption is high at high temperature, and the sodium-based adsorbent is dissolved in water and permeates into soil and water to cause pollution, and the problem of treatment of sodium-containing ash is also needed to be solved.
[ Utility model ] content
The utility model aims to solve the problems in the prior art, and provides an ultralow emission system for treating flue gas of a biomass boiler, which can realize ultralow emission of NOx, sulfur dioxide and dust and achieve the aim of efficiently purifying the flue gas.
In order to achieve the purpose, the utility model provides a biomass boiler flue gas treatment ultralow emission system which comprises a boiler, a ceramic fiber catalytic dust collector, a CFB absorption tower, a bag type dust collector, an induced draft fan and a chimney, wherein an outlet of an economizer of the boiler is connected with an inlet of the ceramic fiber catalytic dust collector through an economizer leading-out flue, an outlet of the ceramic fiber catalytic dust collector is connected with an inlet of the CFB absorption tower, flue gas subjected to dust removal and denitration by the ceramic fiber catalytic dust collector is introduced into the CFB absorption tower for desulfurization, the CFB absorption tower is connected with the bag type dust collector through a first outlet flue, an outlet of the bag type dust collector is connected with the chimney through the induced draft fan, and clean flue gas subjected to dust removal by the bag type dust collector is discharged into the atmosphere through the induced draft fan and the chimney.
Preferably, the ceramic fiber dust remover is arranged between the high-temperature section and the low-temperature section of the boiler economizer, so that the temperature of the flue gas entering the ceramic fiber dust remover is 290-420 ℃.
Preferably, the CFB absorption tower is arranged at the outlet of the boiler air preheater.
Preferably, the circulating ash conveying system comprises a plurality of groups of fluidizing conveying pipelines, the input end of each fluidizing conveying pipeline is connected with the ash bucket outlet of the bag type dust collector, the output end of each fluidizing conveying pipeline is connected with the CFB absorption tower, and the fluidizing air system is communicated with the fluidizing conveying pipelines and fluidizes the circulating ash in the fluidizing conveying pipelines through fluidizing air.
Preferably, the fluidization conveying pipeline is obliquely arranged, the high-level end of the fluidization conveying pipeline is connected with an ash hopper outlet of the bag type dust collector, and the low-level end of the fluidization conveying pipeline is connected with the CFB absorption tower.
Preferably, the fluidization conveying pipeline is also provided with a regulating valve.
Preferably, a plurality of ceramic fiber catalytic filter tubes which are arranged in parallel at equal intervals are arranged in the ceramic fiber catalytic dust collector.
Preferably, the ceramic fiber catalytic dust remover has the function of integrating denitration and dust removal.
Preferably, the bottom of the CFB absorption tower is also provided with a plurality of atomizing nozzles.
The utility model has the beneficial effects that:
1. the ceramic fiber catalytic dust collector is arranged at the outlet of the economizer and used for pre-dedusting and denitration, so that the influence of biomass flue gas viscosity on a catalyst is avoided, meanwhile, the ceramic fiber catalytic dust collector is used for pre-dedusting to replace a cyclone dust collector, so that the influence of sparks and the like on a subsequent system can be collected, and the system resistance and the investment are reduced.
2. The ceramic fiber catalysis filter tube of the ceramic fiber catalysis dust remover can add catalyst, denitration and dust removal are realized simultaneously, and the influence of biomass sticky ash on the dust remover is avoided. The ceramic fiber catalytic filter tube can save 20-30% of the whole cost, and has the advantages of reliability, high efficiency, energy saving and long service life of products.
2. Low power consumption and water consumption, and can avoid corrosion of equipment and chimney.
3. The desulfurizer used by the CFB absorption tower has wide source, low cost, less byproducts and no waste water.
4. Can realize the ultralow emission of sulfur dioxide, dust and NOx and meet the further environmental protection requirement.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic structural diagram of an ultra-low emission system for biomass boiler flue gas treatment according to the present invention.
In the figure: a boiler-1; ceramic fiber catalytic dust collector-2; ceramic fiber catalytic filter tube-21; CFB absorber-3; an atomizing nozzle-31; a bag type dust collector-4; an induced draft fan-5; chimney-6; a circulating ash conveying mechanism-7; adjusting a valve-71; a fluidized air system-8; the economizer leads out of the flue 10.
[ detailed description ] embodiments
Referring to fig. 1, the ultralow emission system for biomass boiler flue gas treatment comprises a boiler 1, a ceramic fiber catalytic dust collector 2, a CFB absorption tower 3, a bag type dust collector 4, an induced draft fan 5 and a chimney 6, wherein an economizer outlet of the boiler 1 is connected with an inlet of the ceramic fiber catalytic dust collector 2 through an economizer leading-out flue 10, an outlet of the ceramic fiber catalytic dust collector 2 is connected with an inlet of the CFB absorption tower 3, flue gas subjected to dust removal and denitration by the ceramic fiber catalytic dust collector 2 is introduced into the CFB absorption tower 3 for desulfurization, the CFB absorption tower 3 is connected with the bag type dust collector 4 through a first outlet flue 30, an outlet of the bag type dust collector 4 is connected with the chimney 6 through the induced draft fan 5, and clean flue gas subjected to dust removal by the bag type dust collector 4 is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.
Further, the ceramic fiber dust remover 2 is arranged between the high-temperature section and the low-temperature section of the boiler economizer, so that the temperature of the flue gas entering the ceramic fiber dust remover 2 is 290-420 ℃.
Further, the CFB absorption tower 3 is arranged at the outlet of the boiler air preheater.
Further, the circulating ash conveying system 7 and the fluidizing air system 8 are further included, the circulating ash conveying system 7 comprises a plurality of groups of fluidizing conveying pipelines, the input ends of the fluidizing conveying pipelines are connected with the ash bucket outlet of the bag type dust collector 4, and the output ends of the fluidizing conveying pipelines are connected with the CFB absorption tower 3. Most particles (including desulfurization dust with incomplete reaction) captured by the bag type dust collector 4 are returned to the CFB absorption tower 3 again through the fluidization conveying pipeline and continuously participate in the reaction, so that the desulfurization reaction is more sufficient, the utilization rate of the desulfurizer is greatly improved, the efficient desulfurization is realized, and a small amount of particles are discharged through the ash discharge port of the bag type dust collector 4. The fluidization air system 8 is communicated with the fluidization conveying pipeline and fluidizes circulating ash in the fluidization conveying pipeline through fluidization air. The circulating ash can flow well, and the circulating ash can return to the CFB absorption tower more easily.
In this embodiment, fluidization pipeline is the slope and arranges, and inclination is 4 ~ 8 degrees, the ash bucket export of bag collector 4 is connected to fluidization pipeline's high-order end, and the diffuser section of the venturi top of CFB absorption tower 3 is connected to the low-order end, does benefit to the circulation ash and returns CFB absorption tower, has avoided the drawback that traditional semi-dry process technology falls the ash easily.
Further, the fluidization transfer pipe is provided with an adjusting valve 71, which can be used for adjusting the throughput of circulating ash, thereby controlling the bed pressure of the CFB absorption tower 3 and further controlling the deacidification efficiency.
Furthermore, a plurality of ceramic fiber catalytic filter tubes 21 arranged in parallel at equal intervals are arranged in the ceramic fiber catalytic dust collector 2.
Further, the bottom of the CFB absorption tower 3 is also provided with a plurality of atomizing nozzles 31, and the addition of atomized water realizes better contact and reaction of flue gas and circulating ash in a wet environment. Atomizing nozzle 31 sets up in the diffuser section of CFB absorption tower 3, and this region is the reaction zone of best, guarantees not to appear causing because of the ununiform mixing of water and gas that bonding, corrosion scheduling problem, makes the absorption tower the most suitable region simultaneously again carry out the deacidification reaction, has improved deacidification efficiency greatly.
The working process of the utility model is as follows:
the utility model relates to an ultralow emission system for biomass boiler flue gas treatment, which is applied to biomass flue gas treatment by taking ceramic fiber catalytic dust removal and CFB semi-dry desulfurization processes as cores and can ensure that the emission indexes of NOx, SO and dust in the biomass flue gas respectively reach 50mg/Nm3、35mg/Nm3、5mg/Nm3Ultra-low emission index requirements. The ceramic fiber catalytic dust remover is arranged at the outlet of a boiler economizer, and is used for removing sparks and viscous ash in the biomass flue gas in advance and removing nitric oxide to realize ultralow emission of NOx; the ceramic fiber catalytic filter tube in the ceramic fiber catalytic dust collector can realize denitration and dust removal, and the denitration efficiency is not lower than 95%. The desulfurization adopts CFB semidry method desulfurization, and sets up in boiler air preheater export, has realized the minimum emission of sulfur dioxide.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (9)
1. The utility model provides a biomass boiler flue gas administers ultralow discharge system which characterized in that: comprises a boiler (1), a ceramic fiber catalytic dust collector (2), a CFB absorption tower (3), a bag type dust collector (4), an induced draft fan (5) and a chimney (6), the outlet of the coal economizer of the boiler (1) is connected with the inlet of the ceramic fiber catalytic dust remover (2) through a coal economizer leading-out flue (10), the outlet of the ceramic fiber catalytic dust collector (2) is connected with the inlet of the CFB absorption tower (3), the flue gas which is dedusted and denitrated by the ceramic fiber catalytic dust collector (2) is introduced into the CFB absorption tower (3) for desulfurization, the CFB absorption tower (3) is connected with the bag type dust collector (4) through a first outlet flue (30), the outlet of the bag type dust collector (4) is connected with a chimney (6) through an induced draft fan (5), and the clean flue gas after dust removal of the bag type dust collector (4) is discharged into the atmosphere through the induced draft fan (5) and the chimney (6).
2. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: the ceramic fiber catalytic dust remover (2) is arranged between the high-temperature section and the low-temperature section of the economizer of the boiler (1), so that the temperature of the flue gas entering the ceramic fiber catalytic dust remover (2) is 290-420 ℃.
3. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: the CFB absorption tower (3) is arranged at the outlet of the boiler air preheater.
4. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: still include circulation ash conveying system (7) and fluidization wind system (8), circulation ash conveying system (7) include a plurality of fluidization pipeline, the ash bucket export of bag collector (4) is connected to fluidization pipeline's input, CFB absorption tower (3) is connected to fluidization pipeline output, fluidization wind system (8) are linked together with fluidization pipeline, fluidize the circulation ash fluidization in the fluidization pipeline through fluidization wind.
5. The biomass boiler flue gas treatment ultra-low emission system of claim 4, wherein: the fluidization conveying pipeline is obliquely arranged, the high-position end of the fluidization conveying pipeline is connected with an ash bucket outlet of the bag type dust collector (4), and the low-position end of the fluidization conveying pipeline is connected with the CFB absorption tower (3).
6. The biomass boiler flue gas treatment ultra-low emission system of claim 4 or 5, wherein: the fluidization conveying pipeline is also provided with a regulating valve (71).
7. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: a plurality of ceramic fiber catalytic filter tubes (21) which are arranged in parallel at equal intervals are arranged in the ceramic fiber catalytic dust collector (2).
8. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: the ceramic fiber catalytic dust collector (2) has the integrated functions of denitration and dust removal.
9. The biomass boiler flue gas treatment ultra-low emission system of claim 1, wherein: the bottom of the CFB absorption tower (3) is also provided with a plurality of atomizing nozzles (31).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225687A (en) * | 2021-11-26 | 2022-03-25 | 浙江菲达科技发展有限公司 | Ultralow discharge system is administered to biomass boiler flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225687A (en) * | 2021-11-26 | 2022-03-25 | 浙江菲达科技发展有限公司 | Ultralow discharge system is administered to biomass boiler flue gas |
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