CN104772032A - Semi-dry flue gas desulfurization and dust removal device and semi-dry flue gas desulfurization and dust removal process - Google Patents
Semi-dry flue gas desulfurization and dust removal device and semi-dry flue gas desulfurization and dust removal process Download PDFInfo
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- CN104772032A CN104772032A CN201510152092.XA CN201510152092A CN104772032A CN 104772032 A CN104772032 A CN 104772032A CN 201510152092 A CN201510152092 A CN 201510152092A CN 104772032 A CN104772032 A CN 104772032A
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Abstract
The invention discloses a semi-dry flue gas desulfurization and dust collection device and a semi-dry flue gas desulfurization and dust collection process, belonging to the field of exhaust treatment of thermal power plants, and solving the problem that a desulfurization process which has the advantages of low cost and small occupying space is in shortage. The semi-dry flue gas desulfurization and dust collection device comprises a desulfurization tower, a draught fan, a chimney, a bag type dust collector, an inclined air tank and a humidifying digester. The desulfurization process has the steps of removing pollutants in the flue gas entering the desulfurization tower; collecting desulfurization dust in the flue gas entering the bag type dust collector; exhausting the flue gas through the chimney after dust collection; digesting CaO in the desulfurization dust to form Ca(OH)2 after the desulfurization dust collected by the bag type dust collector enters the humidifying digester through a dust hopper fluidized tank and the inclined air tank; humidifying the Ca(OH)2 and other parts in the desulfurization dust and finally returning the desulfurization dust to the desulfurization tower for desulfurization again. The desulfurization dust is used as a circulating dust and adopts humidification at the outside of the tower; the problem of dust accumulation and scaling on the inside wall of the tower is avoided; the utilization rate of a desulfurization agent is increased and the desulfurization efficiency is improved.
Description
Technical field
The present invention relates to thermoelectricity exhaust-gas treatment field, particularly a kind of semi-dry process flue gas desulphurization dust arrester and technique thereof.
Background technology
The flue gas desulfurization project of large thermal power plant mainly adopts the Gypsum Wet technique that foreign applications is more ripe, achievement is more, its desulfuration efficiency is high, but system complex, investment are greatly, floor space is large, operating cost is higher, so medium and small boiler many employings dry method, semidry process, to reduce investment and operating cost.But the issue of lifting especially " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) along with environmental protection standard, great majority adopt traditional dry method, the desulfurizing item of semidry process is difficult to up to standard.Medium and small boiler is in the urgent need to small investment, operating cost is low, efficiency is high desulfur technology.
Summary of the invention
The object that the present invention will reach is to provide a kind of semi-dry process flue gas desulphurization dust arrester and technique thereof, the housing structure of CFB (Analyss of Desulphurization Technology of Flue Gas Recirculation Fluid-bad) circulating ash employing simultaneously tower is adopted to be humidified outward, avoid in tower the problem occurring inwall dust stratification, fouling, add the utilization rate of desulfurizing agent, improve desulfuration efficiency.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of semi-dry process flue gas desulphurization dust arrester, comprise desulfurizing tower, air-introduced machine and chimney, also comprise sack cleaner, air flume and humidification digester, desulfurizing tower is provided with exhaust pass and gas approach, desulfurizing tower is communicated with sack cleaner by exhaust pass, sack cleaner has ash bucket fluid-bed, ash bucket fluid-bed is communicated with air flume, the fluid that air flume water conservancy diversion sack cleaner is discharged through ash bucket fluid-bed is to the digester that is humidified, and humidification digester is communicated with desulfurizing tower; Sack cleaner is communicated with chimney by pipeline, and air-introduced machine is located on pipeline; Semi-dry process flue gas desulphurization dust arrester also comprises fluidized wind generator, and the manufacture of fluidized wind generator blows to the fluidized wind of ash bucket fluid-bed, air flume and humidification digester.
The humidification process that desulfurization dust participates in needed for circulation again completes outside desulfurizing tower, the rate of flow of fluid in desulfurizing tower tower body is improved, is increased to 6-8m/s.
Further, the angle of inclination of described air flume is 6 °-10 °, and the angle of inclination of described ash bucket fluid-bed is identical with air flume.Desulfurization dust is made more easily to be directed to humidification digester.
Further, described air flume is provided with control valve.Can be used for the throughput regulating desulfurization dust, thus controlled circulation returns the amount of the desulfurization dust of desulfurizing tower.
Further, described sack cleaner is provided with two groups of ash bucket fluid-beds, and described air flume is also provided with two groups, and two groups of air flumes are communicated with one group of ash bucket fluid-bed respectively.
Further, described humidification digester is provided with exit chute, and humidification digester is communicated with desulfurizing tower by exit chute, and the angle of inclination of exit chute is 6 °-10 °.Desulfurization dust is made more easily to be directed to desulfurizing tower.
Further, described desulfurizing tower is provided with double fluid atomization nozzle.Complete humidification primarily of humidification digester, when the digester moisturization effect that is humidified is not enough, can be humidified by as double fluid atomization nozzle for subsequent use is auxiliary.
Use a semi-dry process flue gas desulphurization dust collecting process for above-mentioned semi-dry process flue gas desulphurization dust arrester, make flue gas enter desulfurizing tower by gas approach, remove SO2, SO3, HF, HCl pollutant; Flue gas through desulfurizing tower process enters sack cleaner trapping desulfurization dust, and the flue gas through dedusting is attracted to discharge through chimney by air-introduced machine; The desulfurization dust trapped by sack cleaner enters humidification digester through ash bucket fluid-bed and air flume, and the CaO in humidification digester digestion desulfurization dust forms Ca (OH)
2; Humidification digester humidification Ca (OH)
2and other parts in desulfurization dust, and make desulfurization dust get back to desulfurizing tower again to participate in desulfurization.
Above-mentioned semi-dry process flue gas desulphurization dust arrester and use the desulfurization dust-removing technique of this device simultaneously to there are inside and outside two kinds of cyclic processes.Inner eycle is that flue gas in desulfurizing tower and absorbent granules are when moving upward, part of smoke and solid particle produce backflow, form very strong internal turbulence, thus add the time of contact of flue gas and absorbent, make desulphurization reaction more abundant, strengthen the collision between solid particle and friction simultaneously, constantly expose fresh absorbent surface, substantially increase the utilization rate of absorbent; Outer circulation is sack cleaner is double deduster, namely two groups of ash bucket fluid-beds are comprised, the incomplete desulfurization dust major part of reaction in its ash bucket fluid-bed is transmitted back to desulfurizing tower again by the air flume (EGR) of two band metering devices, continues to participate in reaction.Due to Ca (OH)
2the recirculation that powder is more than 100 times, substantially increases the utilization rate of absorbent, thus realizes the high-efficiency desulfurization under lower Ca/S.Be humidified outward owing to have employed tower, gas-solid-liquid contact is very abundant, and desulphurization reaction speed is very fast, so outer loop ash quantity can correspondingly reduce, so, bed pressure can be down to below 600Pa, desulfurizing tower outlet dustiness also declines greatly, and these two indexs are all lower than conventional dry desulfur technology.Because in tower, water, gas mix fully, the moisture in Desulphurization can ensure to control below 2%.Both prevent the bonding of lime-ash, corrosion, be also beneficial to the conveying of lime-ash.
The preparation system of absorbent ensures that desulfurizer reaches the important system of design parameter.Humidification digester can ensure to provide high-quality calcium hydroxide dry powder, and calcium hydroxide dry powder enters SO in desulfurizing tower and flue gas by humidification digester
2deng reaction, due to this Ca through special digestion (OH)
2the surface area of powder is large than common slaked lime powder, can improve desulfuration efficiency, can improve again the utilization rate of absorbent.
Water spray quality in humidification digester and desulfurizing tower is particularly important, and the position of its injection point have passed through optimization, ensures there will not be to cause the problems such as bonding, corrosion because of the gentle mixing inequality of water.Water is evenly distributed to circulating ash particle surface by semi-dry process flue gas desulphurization dust arrester, the humidification that adds water in the tower of integration is humidified digester outward makes the moisture of circulating ash be increased to about 5% from 2%, is then that power enters desulfurization reactor by flue negative pressure with fluidized wind.Containing the circulating ash of 5% moisture owing to there being fabulous mobility, overcome traditional CFB dry process because of the excessive sticky wall problem that may occur of the humidification water yield.Humidification digester and fluidization conveying device constitute the humidification by mixing of gas system of the digestion of quick lime, the circulation of Desulphurization, fresh desulfurizing agent and circulating ash.Be humidified the outward operation principle of blender of tower is: from the circulating ash of Air Fluidized groove with from the humidification water of fresh water (FW) system through atomization, control to join in machinery humidification digester by DCS and mix, humidification water is sprayed at the surface of desulfurization dust, the moisture of desulfurization dust is made to be increased to about 5% by original 2%, desulfurization dust now still has good mobility, there is in the bottom of humidification digester the fluidized wind of fluidized wind generator blowout, rely on fluidisation wind action, enter in desulfurizing tower by guide plate overflow, with the SO in flue gas
2reaction generates new desulfurization dust, and the overwhelming majority of desulfurization dust participates in circulation after treatment again, and redundance then discharges system as desulfurization slag, thus completes sweetening process.
After adopting technique scheme, tool of the present invention has the following advantages:
Have higher desulfuration efficiency, desulfurizing tower adopts the housing structure of CFB, and this housing structure bed gas-solid slip velocity is large, improve mass transfer velocity, thus obtain higher desulfuration efficiency, and the rubbing action between absorbent also substantially increases utilization rate.Adopt the outer mechanical humidification cycle ash of desulfurizing tower simultaneously, effectively prevent fouling in tower, avoid tower bed phenomenon, add the adaptability that this technique changes unit load.In addition, the digestion of CaO and the integrated design of ash circulation humidification, run more reliable, and the highly active Ca (OH) of fresh digestion
2participate in circulation desulfurization at once, can desulfuration efficiency be improved, reduce Ca/S, greatly reduce operating cost.And without the intermediate storage induction system of calcium hydroxide.Optimize the bed pressure of desulfurizing tower, because bed forces down, the fluidized bed state of desulfurizing tower is easily set up, and absorbent in tower inner suspension fluidisation, and makes it in the whole load range energy stable operation of boiler.Sack cleaner Inlet dust concentration is low, reduces sack cleaner load.The adaptability of desulphurization plant height, desulfuration efficiency directly by the impact of sulfur content in coal amount, does not only affect the consumption of desulfurizing agent and the output quantity of Desulphurization when ature of coal changes.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of an embodiment of the present invention.
Detailed description of the invention
Embodiment one
See Fig. 1, a kind of semi-dry process flue gas desulphurization dust arrester, comprise desulfurizing tower 1, air-introduced machine 2 and chimney 3, also comprise sack cleaner 4, air flume 5 and humidification digester 6, desulfurizing tower 1 is provided with exhaust pass 11 and gas approach 12, desulfurizing tower 1 is communicated with sack cleaner 4 by exhaust pass 11, sack cleaner 4 has ash bucket fluid-bed 41, ash bucket fluid-bed 41 is communicated with air flume 5, the fluid extremely humidification digester 6 that air flume 5 water conservancy diversion sack cleaner 4 is discharged through ash bucket fluid-bed 41, ash bucket fluid-bed 41 outlet(discharge) flange is connected with air flume 5 hand operated gate valve flange, air flume 5 outlet(discharge) flange is connected with humidification digester 6 circulating ash inlet flange, humidification digester 6 is communicated with desulfurizing tower 1, sack cleaner 4 is communicated with chimney 3 by pipeline 7, and air-introduced machine 2 is located on pipeline 7, semi-dry process flue gas desulphurization dust arrester also comprises fluidized wind generator 8, and fluidized wind generator 8 manufacture blows to the fluidized wind of ash bucket fluid-bed 41, air flume 5 and humidification digester 6.
The angle of inclination of air flume 5 is 8 ° (also can be other angles in 6 °, 10 ° or 6 °-10 °), and the angle of inclination of ash bucket fluid-bed 41 is identical with air flume 5, makes desulfurization dust more easily be directed to humidification digester 6.Air flume 5 is provided with control valve 51, can be used for the throughput regulating desulfurization dust, thus controlled circulation returns the amount of the desulfurization dust of desulfurizing tower 1.Sack cleaner 4 is provided with two groups of ash bucket fluid-beds 41, and air flume 5 is also provided with two groups, and two groups of air flumes 5 are communicated with one group of ash bucket fluid-bed 41 respectively.Humidification digester 6 is provided with exit chute 61, humidification digester 6 is communicated with desulfurizing tower 1 by exit chute 61, the angle of inclination of exit chute 61 is 8 ° (also can be other angles in 6 °, 10 ° or 6 °-10 °), makes desulfurization dust more easily be directed to desulfurizing tower 1.Desulfurizing tower 1 is provided with double fluid atomization nozzle 13, completes humidification primarily of humidification digester 6, when digester 6 moisturization effect that is humidified is not enough, can be humidified by as double fluid atomization nozzle 13 for subsequent use is auxiliary.
Embodiment two
Use a semi-dry process flue gas desulphurization dust collecting process for the semi-dry process flue gas desulphurization dust arrester described in embodiment one, make flue gas enter desulfurizing tower by gas approach, remove SO2, SO3, HF, HCl pollutant; Flue gas through desulfurizing tower process enters sack cleaner trapping desulfurization dust, and the flue gas through dedusting is attracted to discharge through chimney by air-introduced machine; The desulfurization dust trapped by sack cleaner enters humidification digester through ash bucket fluid-bed and air flume, and the CaO in humidification digester digestion desulfurization dust forms Ca (OH) 2, i.e. the main component of absorbent; Other parts in humidification digester humidification Ca (OH) 2 and desulfurization dust, and make desulfurization dust get back to desulfurizing tower again to participate in desulfurization.
Above-mentioned semi-dry process flue gas desulphurization dust arrester and use the desulfurization dust-removing technique of this device simultaneously to there are inside and outside two kinds of cyclic processes.Inner eycle is that flue gas in desulfurizing tower and absorbent granules are when moving upward, part of smoke and solid particle produce backflow, form very strong internal turbulence, thus add the time of contact of flue gas and absorbent, make desulphurization reaction more abundant, strengthen the collision between solid particle and friction simultaneously, constantly expose fresh absorbent surface, substantially increase the utilization rate of absorbent; Outer circulation is sack cleaner is double deduster, namely two groups of ash bucket fluid-beds are comprised, the incomplete desulfurization dust major part of reaction in its ash bucket fluid-bed is transmitted back to desulfurizing tower again by the air flume (EGR) of two band metering devices, continues to participate in reaction.Due to the recirculation of Ca (OH) 2 powder more than 100 times, substantially increase the utilization rate of absorbent, thus realize the high-efficiency desulfurization under lower Ca/S.Be humidified outward owing to have employed tower, gas-solid-liquid contact is very abundant, and desulphurization reaction speed is very fast, so outer loop ash quantity can correspondingly reduce, so, bed pressure can be down to below 600Pa, desulfurizing tower outlet dustiness also declines greatly, and these two indexs are all lower than conventional dry desulfur technology.Because in tower, water, gas mix fully, the moisture in Desulphurization can ensure to control below 2%.Both prevent the bonding of lime-ash, corrosion, be also beneficial to the conveying of lime-ash.
The preparation system of absorbent ensures that desulfurizer reaches the important system of design parameter.Humidification digester can ensure to provide high-quality calcium hydroxide dry powder, calcium hydroxide dry powder to enter in desulfurizing tower and flue gas the reactions such as SO2 by humidification digester, because the surface area of this Ca through special digestion (OH) 2 powder is large than common slaked lime powder, can desulfuration efficiency be improved, the utilization rate of absorbent can be improved again.
Water spray quality in humidification digester and desulfurizing tower is particularly important, and the position of its injection point have passed through optimization, ensures there will not be to cause the problems such as bonding, corrosion because of the gentle mixing inequality of water.Water is evenly distributed to circulating ash particle surface by semi-dry process flue gas desulphurization dust arrester, the humidification that adds water in the tower of integration is humidified digester outward makes the moisture of circulating ash be increased to about 5% from 2%, is then that power enters desulfurization reactor by flue negative pressure with fluidized wind.Containing the circulating ash of 5% moisture owing to there being fabulous mobility, overcome traditional CFB dry process because of the excessive sticky wall problem that may occur of the humidification water yield.Humidification digester and fluidization conveying device constitute the humidification by mixing of gas system of the digestion of quick lime, the circulation of Desulphurization, fresh desulfurizing agent and circulating ash.Be humidified the outward operation principle of blender of tower is: from the circulating ash of Air Fluidized groove with from the humidification water of fresh water (FW) system through atomization, control to join in machinery humidification digester by DCS and mix, humidification water is sprayed at the surface of desulfurization dust, the moisture of desulfurization dust is made to be increased to about 5% by original 2%, desulfurization dust now still has good mobility, there is in the bottom of humidification digester the fluidized wind of fluidized wind generator blowout, rely on fluidisation wind action, enter in desulfurizing tower by guide plate overflow, react with the SO2 in flue gas and generate new desulfurization dust, the overwhelming majority of desulfurization dust participates in circulation after treatment again, redundance then discharges system as desulfurization slag, thus complete sweetening process.
Have higher desulfuration efficiency, desulfurizing tower adopts the housing structure of CFB, and this housing structure bed gas-solid slip velocity is large, improve mass transfer velocity, thus obtain higher desulfuration efficiency, and the rubbing action between absorbent also substantially increases utilization rate.Adopt the outer mechanical humidification cycle ash of desulfurizing tower simultaneously, effectively prevent fouling in tower, avoid tower bed phenomenon, add the adaptability that this technique changes unit load.In addition, the digestion of CaO and the integrated design of ash circulation humidification, run more reliable, and the highly active Ca (OH) 2 of fresh digestion participates in circulation desulfurization at once, can improve desulfuration efficiency, reduces Ca/S, greatly reduces operating cost.And without the intermediate storage induction system of calcium hydroxide.Optimize the bed pressure of desulfurizing tower, because bed forces down, the fluidized bed state of desulfurizing tower is easily set up, and absorbent in tower inner suspension fluidisation, and makes it in the whole load range energy stable operation of boiler.Sack cleaner Inlet dust concentration is low, reduces sack cleaner load.The adaptability of desulphurization plant height, desulfuration efficiency directly by the impact of sulfur content in coal amount, does not only affect the consumption of desulfurizing agent and the output quantity of Desulphurization when ature of coal changes.
Except above preferred embodiment, the present invention also has other embodiment, and those skilled in the art can make various change and distortion according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope that claims of the present invention define.
Claims (7)
1. a semi-dry process flue gas desulphurization dust arrester, comprise desulfurizing tower (1), air-introduced machine (2) and chimney (3), it is characterized in that: also comprise sack cleaner (4), air flume (5) and humidification digester (6), desulfurizing tower is provided with exhaust pass (11) and gas approach (12), desulfurizing tower is communicated with sack cleaner by exhaust pass, sack cleaner has ash bucket fluid-bed (41), ash bucket fluid-bed is communicated with air flume, the fluid that air flume water conservancy diversion sack cleaner is discharged through ash bucket fluid-bed is to the digester that is humidified, humidification digester is communicated with desulfurizing tower, sack cleaner is communicated with chimney by pipeline (7), and air-introduced machine is located on pipeline, semi-dry process flue gas desulphurization dust arrester also comprises fluidized wind generator (8), and the manufacture of fluidized wind generator blows to the fluidized wind of ash bucket fluid-bed, air flume and humidification digester.
2., according to the arbitrary described a kind of semi-dry process flue gas desulphurization dust arrester of claim 1, it is characterized in that: the angle of inclination of described air flume is 6 °-10 °, and the angle of inclination of described ash bucket fluid-bed is identical with air flume.
3. a kind of semi-dry process flue gas desulphurization dust arrester according to claim 2, is characterized in that: described air flume is provided with control valve (51).
4. a kind of semi-dry process flue gas desulphurization dust arrester according to claim 3, is characterized in that: described sack cleaner is provided with two groups of ash bucket fluid-beds, and described air flume is also provided with two groups, two groups of air flumes are communicated with one group of ash bucket fluid-bed respectively.
5. according to the arbitrary described a kind of semi-dry process flue gas desulphurization dust arrester of claim 1-4, it is characterized in that: described humidification digester is provided with exit chute (61), humidification digester is communicated with desulfurizing tower by exit chute, and the angle of inclination of exit chute is 6 °-10 °.
6., according to the arbitrary described a kind of semi-dry process flue gas desulphurization dust arrester of claim 1-4, it is characterized in that: described desulfurizing tower is provided with double fluid atomization nozzle (13).
7. use a semi-dry process flue gas desulphurization dust collecting process for the semi-dry process flue gas desulphurization dust arrester described in claim 1, it is characterized in that: make flue gas enter desulfurizing tower by gas approach, remove SO
2, SO
3, HF, HCl pollutant; Flue gas through desulfurizing tower process enters sack cleaner trapping desulfurization dust, and the flue gas through dedusting is attracted to discharge through chimney by air-introduced machine; The desulfurization dust trapped by sack cleaner enters humidification digester through ash bucket fluid-bed and air flume, and the CaO in humidification digester digestion desulfurization dust forms Ca (OH)
2; Humidification digester humidification Ca (OH)
2and other parts in desulfurization dust, and make desulfurization dust get back to desulfurizing tower again to participate in desulfurization.
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|---|---|---|---|
| CN201510152092.XA CN104772032A (en) | 2015-04-01 | 2015-04-01 | Semi-dry flue gas desulfurization and dust removal device and semi-dry flue gas desulfurization and dust removal process |
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|---|---|---|---|
| CN201510152092.XA CN104772032A (en) | 2015-04-01 | 2015-04-01 | Semi-dry flue gas desulfurization and dust removal device and semi-dry flue gas desulfurization and dust removal process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126591A (en) * | 2015-07-22 | 2015-12-09 | 李幸辉 | Dynamic reaction zone-based high-efficiency semi-dry desulfurization method |
| CN105561789A (en) * | 2015-12-22 | 2016-05-11 | 秦皇岛首秦金属材料有限公司 | Method for preventing ash blockage of reactor elbow in semi-dry sintering flue gas desulfurization process |
| CN110975554A (en) * | 2018-10-03 | 2020-04-10 | 新疆宝新昌佳石灰制品有限公司 | Method for flue gas desulfurization of lime rotary kiln by using kiln tail ash |
| CN115025614A (en) * | 2022-05-30 | 2022-09-09 | 中玻（陕西）新技术有限公司 | Cyclic semi-dry desulfurization process |
-
2015
- 2015-04-01 CN CN201510152092.XA patent/CN104772032A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105126591A (en) * | 2015-07-22 | 2015-12-09 | 李幸辉 | Dynamic reaction zone-based high-efficiency semi-dry desulfurization method |
| CN105561789A (en) * | 2015-12-22 | 2016-05-11 | 秦皇岛首秦金属材料有限公司 | Method for preventing ash blockage of reactor elbow in semi-dry sintering flue gas desulfurization process |
| CN110975554A (en) * | 2018-10-03 | 2020-04-10 | 新疆宝新昌佳石灰制品有限公司 | Method for flue gas desulfurization of lime rotary kiln by using kiln tail ash |
| CN115025614A (en) * | 2022-05-30 | 2022-09-09 | 中玻（陕西）新技术有限公司 | Cyclic semi-dry desulfurization process |
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