CN102553425A - Wet flue gas denitrifying system for coal fired power plant boiler - Google Patents
Wet flue gas denitrifying system for coal fired power plant boiler Download PDFInfo
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- CN102553425A CN102553425A CN2011103892721A CN201110389272A CN102553425A CN 102553425 A CN102553425 A CN 102553425A CN 2011103892721 A CN2011103892721 A CN 2011103892721A CN 201110389272 A CN201110389272 A CN 201110389272A CN 102553425 A CN102553425 A CN 102553425A
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Abstract
The invention discloses a wet flue gas denitrifying system for a coal fired power plant boiler. The system comprises an inlet flue, an outlet flue, a SO2 absorption column, a chimney and an ash slurry pond, wherein the inlet flue is communicated with the lower part of the SO2 absorption column; one end of the outlet flue is communicated with the upper part of the SO2 absorption column, and the other end of the outlet flue is communicated with the chimney; coal ash slurry made of coal ash generated through low-sulfur coal combustion is accommodated in the ash slurry pond; at least one layer of slurry-spraying layer pipe used for conveying the coal ash slurry is arranged on the upper part of the SO2 absorption column; a plurality of spiral nozzles are arranged on the slurry-spraying layer pipe; after being pumped into the slurry-spraying layer pipe through a pump, the coal ash slurry is sprayed out of the spiral nozzles in a form of fog; and SO2 gas in boiler flue gas is removed in a way of absorption. The slurry made of the coal ash generated through low-sulfur coal combustion serves as a denitrifying absorbent, equipment is simple and reliable, and the investment and operation cost of the denitrifying system can be greatly reduced.
Description
Technical field
The present invention relates to coal-fired power station boiler flue gas desulfurization field of purification, be specially a kind of wet method fume desulfurizing system that is used for coal-fired power station boiler.
Background technology
China is to be the country of main energy sources with the coal, and the main fuel of coal fired power plant is a raw coal, the coal-fired SO that is discharged
2The air environmental pollution that is caused is very serious, has become the key factor of restriction Chinese national economy sustainable development, therefore, coal-fired power station boiler is carried out flue gas desulfurization with control SO
2Polluting, has been China's the most urgent task in air environmental pollution control field.
The characteristics of wet process of FGD technology are the rear ends that whole desulphurization system is positioned at flue, and after the deduster, sweetening process is carried out in absorbent solution; Desulfurizing agent and desulfurization resultant are hygrometric state; Therefore, the wet process of FGD process is gas liquid reaction, and desulphurization reaction speed is fast; Desulfuration efficiency is high, is suitable for the flue gas desulfurization of coal-fired power station boiler.
The wet process of FGD technology of having developed in the world at present mainly contains limestone washing method, two alkaline process, Wei Erman-Luo Defa, magnesium oxide method and ammonia process etc.; Wet desulphurization account for the world install flue gas desulfurization the unit total capacity 85%; Different wet process of FGD technology respectively have its pluses and minuses; Simultaneously, the wet desulphurization technology of thermal power plant's application still exists fouling, huge, the problems such as power consumption is big, operating cost height of burn into investment in varying degrees at home.China is vast in territory, and coal-fired sulfur content differs greatly, and therefore, does not also have a kind of wet process of FGD technology can generally be applicable to the flue gas desulfurization of China's coal-fired power station boiler, so, press for wet desulphurization technology and technology that exploitation is fit to China's ature of coal condition.
Flyash is the solid combustion product that is discharged behind the coal powder boiler combustion, its surface porosity porous, and surface area is bigger, and has the certain activity group.In addition, flyash is mainly by silica SiO
2, alundum (Al Al
2O
3, di-iron trioxide Fe
2O
3Form with key component such as calcium oxide CaO, in addition, also have the oxide and the rare oxide of a spot of magnesium, titanium, potassium, sodium, phosphorus etc.Wherein respectively organizing and wanting the shared quality percentage composition of component is SiO
2: 40%-58%; Al
2O
3: 12%-29%; Fe
2O
3: 4%-18%; CaO:4%-7%; C:1%-10% is because flyash contains a large amount of porous amorphous SiO
2And Al
2O
3, to sour gas SO
2Suction-operated is arranged, and this adsorption function comprises physical absorption and chemisorbed.The chemical adsorption capacity of flyash depends primarily on Si-O and the Al-O active group in the flyash, and they can combine with adsorbate chemistry chain or ion, thereby produce absorption.
The former coal reserves of north China low-sulfur is bigger, uses the characteristics that the flyash that produces behind the low-sulfur coal has high basicity, with the Ca that uses in the slurries that the coal ash that produces behind the low-sulfur coal processes
2+, Mg
2+Content Deng alkaline matter is high, and the pH value is high, to the SO in the flue gas
2Very strong absorbability is arranged.For the station boiler that uses the low-sulfur raw coal, because the SO in its flue gas
2Content is low, and therefore, the pulverized fuel ash slurry of employing low-sulfur coal can reach environmental requirement as the absorbent of desulfurization, can reduce the investment and the operating cost of wet method fume desulfurizing system simultaneously greatly.
Summary of the invention
The purpose of this invention is to provide a kind of wet method fume desulfurizing system that is used for coal-fired power station boiler; This desulphurization system adopts the flyash after low-sulfur coal burning to process slurries as desulfurization absorbent, and equipment is simple and reliable and can reduce the investment and the operating cost of desulphurization system greatly.
The objective of the invention is to realize through following technical scheme: a kind of wet method fume desulfurizing system that is used for coal-fired power station boiler comprises inlet flue duct, exhaust pass, SO
2Absorption tower and chimney, said inlet flue duct and SO
2The bottom on absorption tower is connected, an end and the SO of said exhaust pass
2The top on absorption tower is connected, and the other end is connected with chimney, it is characterized in that: said desulphurization system also comprises mortar pool, the pulverized fuel ash slurry that the flyash in the said mortar pool after the burning of splendid attire low-sulfur coal is processed, said SO
2The top on absorption tower is provided with the gunite layer pipeline of one deck conveying pulverized fuel ash slurry at least; The end that pipeline is provided with the dust piping of slurry pump is communicated with the gunite layer pipeline; The other end is communicated with mortar pool; A plurality of spiral nozzles are installed on the gunite layer pipeline, pulverized fuel ash slurry after pump pressure pumps into the gunite layer pipeline from spiral nozzle with vaporific ejection, and get into SO
2The boiler smoke that upwards flows in the absorption tower is removed the SO in the boiler smoke with the contact of reflux type gas-liquid with the mode that absorbs
2Gas, the boiler smoke after the desulfurization is discharged after exhaust pass gets into chimney.
Desulphurization system of the present invention is set up mortar pool; The pulverized fuel ash slurry that flyash in the mortar pool after the burning of splendid attire low-sulfur coal is processed; Adopt the flyash after low-sulfur coal burns to process the desulfurization absorbent of slurries, can reduce the investment and the operating cost of desulphurization system greatly as boiler smoke.
Among the present invention, described gunite layer pipeline is three layers, and three layers of gunite layer pipeline are with spaced set about the parallel way, and three layers of gunite layer pipeline all are communicated with described dust piping.
The present invention can do following improvement: said SO
2The absorption tower also is provided with one deck demister at least being positioned at the gunite layer conduit upper, to remove slurries droplet entrained in the boiler smoke.Described demister is two-layer, is provided with up and down.
The present invention can also do following improvement: said desulphurization system also is provided with the rinse water pipeline between two-layer demister, and said rinse water pipeline is provided with a plurality of washer jets, regularly demister is washed, and stops up to prevent the demister fouling.
Among the present invention, said mortar pool also is communicated with boiler blow-off waterpipe and fresh water (FW) pipeline respectively, and boiler blowdown water and fresh water (FW) are respectively through sending into moisturizing in the mortar pool behind boiler blow-off waterpipe and the fresh water (FW) pipeline.
The present invention can also further improve as follows: said desulphurization system also comprises sedimentation basin, and said sedimentation basin is arranged on SO
2The bottom on absorption tower is with SO
2The absorption tower fuses, and and SO
2The absorption tower is connected, and said sedimentation basin is communicated with through the deposition waste pipe with mortar pool, and the deposition waste pipe is provided with water pump, and the waste water that the sedimentation basin post precipitation is separated out is sent in the mortar pool through water pump and utilized again.
Said sedimentation basin also is connected with the grey conveyance conduit of deposition; Precipitate grey conveyance conduit and be provided with defeated grey pump; The pulverized fuel ash slurry of accomplishing sulfur removal technology flows into deposition in the sedimentation basin, the deposition ash that generates through post precipitation through defeated grey pump pump pressure after precipitate grey conveyance conduit output.
Among the present invention, be provided with damper on said inlet flue duct, the exhaust pass.
Among the present invention, be provided with agitator in the said mortar pool, so that pulverized fuel ash slurry is stirred.
Compared with prior art, the present invention has following remarkable result:
(1) desulphurization system of the present invention adopts the flyash after low-sulfur coal burns to process the desulfurization absorbent of slurries as boiler smoke, because flyash is cheap, is easy to obtain, with the operating cost that reduces wet method fume desulfurizing system significantly.
(2) flyash in the desulphurization system of the present invention in use can adopt the method for abandoning; Be that pulverized fuel ash slurry is accomplished desulfurization; And can be with the deposition ash through defeated grey pumping ash charge field through post precipitation; The deposition waste water of separating out is then sent into mortar pool with water pump through the deposition waste pipe, will participate in the pulverized fuel ash slurry preparation again, realizes twice laid.
(3) desulphurization system of the present invention adopts the desulfurization absorbent that the flyash after low-sulfur coal burns is processed, and can solve the ubiquitous scale problems of wet desulfurization system.For independent employing lime stone or lime system,, separate out easily or crystallization produces fouling in wall or pond because lime stone, calcium hydroxide are that calcium hydroxide and desulfurization product calcium sulfite and the solubility of calcium sulfate in water are all lower as desulfurizing agent.Simultaneously, adopt the system of lime stone as desulfurizing agent separately, the pH value of its desulfurizer slurry is 5～6 when operation, easily the corroding metal wall.The desulfurization absorbent that adopts the flyash after low-sulfur coal burns to process, the pH value of its its desulfurizer slurry when operation can hang down the mitigate corrosion problem significantly greater than 7; Simultaneously, because flyash is inexpensive and be that power plant is self-produced, so can adopt the method for abandoning; Desulfurization product is mixed in the pulverized fuel ash slurry; And can be with the defeated grey pumping ash charge field of desulfurization product warp that is mixed in the deposition ash through post precipitation, the deposition institute waste water of separating out is then sent into mortar pool with water pump through the deposition waste pipe, will participate in pulverized fuel ash slurry again and prepare; Therefore, can not produce scale problems in wall or the pond.
(4) desulphurization system of the present invention is in the SO2 absorption tower, and pulverized fuel ash slurry contacts with the reflux type gas-liquid with boiler smoke, guarantees to greatest extent with SO in pulverized fuel ash slurry and the boiler cigarette
2The abundant contact of gas has best assimilation effect.
(5) mortar pool in the desulphurization system of the present invention also is communicated with boiler blow-off waterpipe and fresh water (FW) pipeline respectively, and boiler blowdown water and fresh water (FW) are sent in the mortar pool through pipeline, when giving the mortar pool moisturizing, also realizes water reuse.
(6) desulphurization system equipment of the present invention is simple and reliable, and the operating cost of equipment and running cost are all lower.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is explained further details.
Fig. 1 is the overall structure sketch map of desulphurization system of the present invention.
Among the figure: 1, inlet flue duct; 2, by-pass flue baffle plate; 3, SO
2The absorption tower; 4, inlet flue duct baffle plate; 5, spiral nozzle; 6, demister; 7, defeated grey pump; 8, precipitate grey conveyance conduit; 9, sedimentation basin; 10, mortar pool; 11, deposition waste pipe; 12, water pump; 13, agitator; 14, flyash pipeline; 15, boiler blow-off waterpipe; 16, fresh water (FW) pipeline; 17, dust piping; 18, slurry pump; 19, gunite layer pipeline; 20, rinse water pipeline; 21, washer jet; 22, exhaust pass; 23, exhaust pass baffle plate; 24, by-pass flue; 25, chimney
The specific embodiment
A kind of wet method fume desulfurizing system that is used for coal-fired power station boiler as shown in Figure 1, this desulphurization system comprises inlet flue duct 1, by-pass flue baffle plate 2, SO
2The grey conveyance conduit of absorption tower 3, inlet flue duct baffle plate 4, spiral nozzle 5, demister 6, defeated grey pump 7, deposition 8, sedimentation basin 9, mortar pool 10, deposition waste pipe 11, water pump 12, agitator 13, flyash pipeline 14, boiler blow-off waterpipe 15, fresh water (FW) pipeline 16, dust piping 17, slurry pump 18, gunite layer pipeline 19, rinse water pipeline 20, washer jet 21, exhaust pass 22, exhaust pass baffle plate 23, by-pass flue 24, chimney 25.Sedimentation basin 9 of the present invention is arranged on SO
2The bottom on absorption tower 3 is with SO
2Absorption tower 3 fuses, and and SO
2Absorption tower 3 is connected, and sedimentation basin 9 is communicated with through deposition waste pipe 11 with mortar pool 10, and deposition waste pipe 11 is provided with water pump 12, and the waste water that sedimentation basin 9 post precipitations are separated out is sent in the mortar pool 10 through water pump 12 and utilized again.Sedimentation basin 9 also is connected with the grey conveyance conduit 8 of deposition; Precipitate grey conveyance conduit 8 and be provided with defeated grey pump 7; The pulverized fuel ash slurry of accomplishing sulfur removal technology flows into deposition in the sedimentation basin 9, the deposition ash that generates through post precipitation through defeated grey pump 7 pump pressures after precipitate grey conveyance conduit 8 outputs.
Inlet flue duct 1 of the present invention is provided with inlet flue duct baffle plate 4, exhaust pass 22 is provided with exhaust pass baffle plate 23, inlet flue duct 1 and SO
2The bottom on absorption tower 3 is connected, an end and the SO of the exhaust pass 22 of boiler
2The top on absorption tower 3 is connected, the other end then through exhaust pass baffle plate 23 be connected with chimney 25, the two ends that 24 of the by-pass flues of by-pass flue baffle plate 2 are installed then are connected with inlet flue duct 1 and exhaust pass 22 respectively.
The pulverized fuel ash slurry that flyash in the mortar pool 10 of the present invention after the burning of splendid attire low-sulfur coal is processed is provided with agitator 13 in the mortar pool 10, so that pulverized fuel ash slurry is stirred, and SO
2The top on absorption tower 3 is provided with three layers of gunite layer pipeline 19 of carrying pulverized fuel ash slurry; The end that pipeline is provided with the dust piping 17 of slurry pump 18 is communicated with gunite layer pipeline 19; The other end is communicated with mortar pool 10; A plurality of spiral nozzles 5 are installed on the gunite layer pipeline 19, pulverized fuel ash slurry after pump pressure pumps into gunite layer pipeline 19 from spiral nozzle 5 with vaporific ejection, and get into SO
2The boiler smoke that upwards flows in the absorption tower 3 is removed the SO in the boiler smoke with the contact of reflux type gas-liquid with the mode that absorbs
2Gas, the boiler smoke after the desulfurization is discharged after exhaust pass 22 gets into chimney 25.
Three layers of gunite layer pipeline 19 among the present invention are with spaced set about the parallel way, and three layers of gunite layer pipeline 19 all are communicated with dust piping 17.
SO among the present invention
2Absorption tower 3 also is provided with two-layer demister 6 being positioned at gunite layer pipeline 19 tops, and two-layer demister 6 is provided with up and down, demister 6 is set to remove slurries droplet entrained in the boiler smoke.Between two-layer demister 6, also be provided with rinse water pipeline 20, rinse water pipeline 20 is provided with a plurality of washer jets 21, regularly demister 6 is washed, and stops up to prevent demister 6 foulings.
During desulphurization system of the present invention operation, the pulverized fuel ash slurry that in mortar pool 10, prepares is sent into gunite layer pipeline 19 through dust piping 17 by slurry pump 18, and is ejected into SO downwards after atomizing through the spiral nozzle of installing on the gunite layer pipeline 19 5
2In the absorption tower 3.Flue gas from boiler gets into SO through inlet flue duct 1 and gas approach baffle plate 4
2Flow in the absorption tower 3 and upwards, and washed with reflux type by the pulverized fuel ash slurry drop that flows downward, be atomized, gas is able to fully contact with slurries, removes SO with the mode that absorbs
2Gas.Remove SO through pulverized fuel ash slurry
2The flue gas of gas is flowed through and is positioned at the two-layer demister 6 on whitewashing pipeline 19 tops, herein slurries droplet entrained in the flue gas is removed, and then, flue gas is sent into behind antiseptic chimney 25 through exhaust pass 22 and exhaust pass baffle plate 23 and entered atmosphere.For preventing demister 6 foulings obstruction, the fresh water (FW) of sending into through rinse water pipeline 20 regularly washes demister through washer jet 21.
At SO
2In the absorption tower 3, the pulverized fuel ash slurry of accomplishing sulfur removal technology flows directly into and is positioned at SO
2The sedimentation basin 9 of 3 bottoms, absorption tower, through depositing technology, the deposition ash is sent into grey by defeated grey pump 7 through precipitating grey conveyance conduit 8.Waste water that depositing technology is separated out is then sent into mortar pool 10 with water pump 12 through time deposition waste pipe 11 and is participated in the pulverized fuel ash slurry preparation again, realizes twice laid.
Because input gas temperature is usually more than 110 ℃, therefore, at SO
2Portion of water in the pulverized fuel ash slurry in the absorption tower 3 can be evaporated, and boiler blowdown water and fresh water (FW) are sent in the mortar pool 10 through sewer pipeline 23 and fresh water (FW) pipeline 24 respectively and compensated, and when giving the mortar pool moisturizing, also realize water reuse.
Claims (10)
1. a wet method fume desulfurizing system that is used for coal-fired power station boiler comprises inlet flue duct (1), exhaust pass (22), SO
2Absorption tower (3) and chimney (25), said inlet flue duct (1) and SO
2The bottom on absorption tower (3) is connected, an end and the SO of said exhaust pass (22)
2The top on absorption tower (3) is connected, and the other end is connected with chimney (25), it is characterized in that: said desulphurization system also comprises mortar pool (10), the pulverized fuel ash slurry that the flyash after the interior splendid attire low-sulfur coal burning of said mortar pool (10) is processed, said SO
2The top on absorption tower (3) is provided with the gunite layer pipeline (19) of one deck conveying pulverized fuel ash slurry at least; The end that pipeline is provided with the dust piping (17) of slurry pump (18) is communicated with gunite layer pipeline (19); The other end is communicated with mortar pool (10); A plurality of spiral nozzles (5) are installed on the gunite layer pipeline (19), pulverized fuel ash slurry after pump pressure pumps into gunite layer pipeline (19) from spiral nozzle (5) with vaporific ejection, and get into SO
2The boiler smoke that upwards flows in the absorption tower (3) is removed the SO in the boiler smoke with the contact of reflux type gas-liquid with the mode that absorbs
2Gas, the boiler smoke after the desulfurization is discharged after exhaust pass (22) gets into chimney (25).
2. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 1; It is characterized in that: described gunite layer pipeline (19) is three layers; Three layers of gunite layer pipeline (19) are with spaced set about the parallel way, and three layers of gunite layer pipeline (19) all are communicated with described dust piping (17).
3. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 1 is characterized in that: said SO
2Absorption tower (3) also is provided with one deck demister (6) at least being positioned at gunite layer pipeline (19) top, to remove slurries droplet entrained in the boiler smoke.
4. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 3 is characterized in that: described demister (6) is provided with up and down for two-layer.
5. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 4; It is characterized in that: said desulphurization system also is provided with rinse water pipeline (20) between two-layer demister (6); Said rinse water pipeline (20) is provided with a plurality of washer jets (21); Regularly demister (6) is washed, stop up to prevent demister (6) fouling.
6. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 1; It is characterized in that: said mortar pool (10) also is communicated with boiler blow-off waterpipe (23) and fresh water (FW) pipeline (24) respectively, and boiler blowdown water and fresh water (FW) are sent into moisturizing in the mortar pool (10) after passing through boiler blow-off waterpipe (23) and fresh water (FW) pipeline (24) respectively.
7. according to each described wet method fume desulfurizing system that is used for coal-fired power station boiler of claim 1 to 6, it is characterized in that: said desulphurization system also comprises sedimentation basin (9), and said sedimentation basin (9) is arranged on SO
2The bottom on absorption tower (3) is with SO
2Absorption tower (3) fuses, and and SO
2Absorption tower (3) is connected; Said sedimentation basin (9) is communicated with through deposition waste pipe (11) with mortar pool (10); Deposition waste pipe (11) is provided with water pump (12), and the waste water that sedimentation basin (9) post precipitation is separated out is sent in the mortar pool (10) through water pump (12) and utilized again.
8. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 7; It is characterized in that: said sedimentation basin (9) also is connected with deposition grey conveyance conduit (8); Precipitate grey conveyance conduit (8) and be provided with defeated grey pump (7); The pulverized fuel ash slurry of accomplishing sulfur removal technology flows into deposition in the sedimentation basin (9), the deposition ash that generates through post precipitation through defeated grey pump (7) pump pressure after precipitate grey conveyance conduit (8) and export.
9. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 1 is characterized in that: said inlet flue duct (1), exhaust pass are provided with damper on (22).
10. the wet method fume desulfurizing system that is used for coal-fired power station boiler according to claim 1 is characterized in that: be provided with agitator (13) in the said mortar pool (10), so that pulverized fuel ash slurry is stirred.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103892721A CN102553425A (en) | 2011-11-29 | 2011-11-29 | Wet flue gas denitrifying system for coal fired power plant boiler |
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|---|---|---|---|
| CN2011103892721A CN102553425A (en) | 2011-11-29 | 2011-11-29 | Wet flue gas denitrifying system for coal fired power plant boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108854499A (en) * | 2018-08-09 | 2018-11-23 | 河南禾力能源股份有限公司 | A kind of furfural dregs boiler smoke magnesia FGD purification device |
| CN109966895A (en) * | 2019-03-27 | 2019-07-05 | 北海市传创环保科技有限公司 | A method of flue gas is handled using flyash |
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2784762Y (en) * | 2005-02-03 | 2006-05-31 | 哈尔滨工大格瑞环保能源科技有限公司 | Flue-gas desulfurization device for thermal power plant |
| CN202478813U (en) * | 2011-11-29 | 2012-10-10 | 广东电网公司电力科学研究院 | Wet flue gas desulphurization system used for coal-fired power plant boiler |
-
2011
- 2011-11-29 CN CN2011103892721A patent/CN102553425A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2784762Y (en) * | 2005-02-03 | 2006-05-31 | 哈尔滨工大格瑞环保能源科技有限公司 | Flue-gas desulfurization device for thermal power plant |
| CN202478813U (en) * | 2011-11-29 | 2012-10-10 | 广东电网公司电力科学研究院 | Wet flue gas desulphurization system used for coal-fired power plant boiler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108854499A (en) * | 2018-08-09 | 2018-11-23 | 河南禾力能源股份有限公司 | A kind of furfural dregs boiler smoke magnesia FGD purification device |
| CN109966895A (en) * | 2019-03-27 | 2019-07-05 | 北海市传创环保科技有限公司 | A method of flue gas is handled using flyash |
| CN114749007A (en) * | 2022-04-20 | 2022-07-15 | 保定正德电力技术有限公司 | Automatic control system for wet flue gas desulfurization |
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Application publication date: 20120711 |