CN109985499B - Intelligent matching method and system for desulfurization and oxidation air quantity - Google Patents
Intelligent matching method and system for desulfurization and oxidation air quantity Download PDFInfo
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- CN109985499B CN109985499B CN201910371816.8A CN201910371816A CN109985499B CN 109985499 B CN109985499 B CN 109985499B CN 201910371816 A CN201910371816 A CN 201910371816A CN 109985499 B CN109985499 B CN 109985499B
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- steam
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- air
- desulfurization
- heat recovery
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 27
- 230000023556 desulfurization Effects 0.000 title claims abstract description 27
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003647 oxidation Effects 0.000 title claims abstract description 17
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000011084 recovery Methods 0.000 claims description 24
- 235000019738 Limestone Nutrition 0.000 claims description 13
- 239000006028 limestone Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 11
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 10
- 235000010261 calcium sulphite Nutrition 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 238000003303 reheating Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an intelligent matching method and system for desulfurization and oxidation air quantity, wherein the matching method comprises the following steps: the matching system comprises a steam injector, wherein the steam injector is respectively provided with a power steam inlet pipeline, a suction port access pipeline and an injection port pipeline, and the injection port pipeline is directly communicated with a steam inlet pipeline of the desulfurizing tower. The invention can not only reduce the electricity consumption rate of the desulfurization plant, reduce noise and maintenance, but also realize heat recycling and improve the efficiency of the steam turbine.
Description
Technical Field
The invention relates to wet desulfurization technology, in particular to an intelligent desulfurization and oxidation air quantity matching method and system.
Background
Along with the continuous improvement of sulfur dioxide emission standard of the thermal power plant in China, the sulfur content of the coal is also increased compared with the prior art, and the prior wet desulfurization technology has more strict requirements.
At present, a limestone/gypsum method is commonly adopted in a power plant for desulfurization, an oxidation fan is utilized for boosting air, then the air is introduced into limestone slurry, the mixing of the air and the limestone slurry is accelerated through a stirrer, and calcium sulfite generated after sulfur dioxide is absorbed is oxidized into calcium sulfate, so that desulfurization is realized. However, as the load of the unit changes, the sulfur dioxide content in the flue gas also changes correspondingly, and the air quantity of the calcium sulfite needs to enter the limestone slurry also changes correspondingly.
The oxidation fan that generally adopts at present is Roots's fan, and its noise is very big when running, and the maintenance volume is also very high, and the power of oxidation fan is usually opened to the biggest during the operation to can not intelligent regulation, power consumption also increases. Therefore, a mode is sought, an oxidation fan can be replaced, noise pollution is avoided, maintenance amount and power consumption are reduced, and meanwhile, the amount of air entering can be intelligently adjusted according to the concentration of oxygen in the desulfurizing tower, so that the problem of power plant urgent need to be solved is solved.
Disclosure of Invention
The invention aims to solve the problems, and provides an intelligent matching method and system for desulfurization and oxidation air quantity.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an intelligent matching method for desulfurization and oxidation air quantity comprises the following steps: the air is injected by the power steam, and is directly introduced into the limestone slurry of the desulfurizing tower after being boosted.
In a preferred embodiment of the present invention, the amount of intake air is intelligently adjusted according to the concentration of calcium sulfite in the desulfurizing tower.
In a preferred embodiment of the invention, the heat in the air after pressure boosting is recovered first and then introduced into the limestone slurry of the desulfurizing tower.
The intelligent matching system for the desulfurization and oxidation air quantity comprises a steam injector, wherein a power steam inlet pipeline, a suction port access pipeline and an injection port pipeline are respectively arranged on the steam injector, and the injection port pipeline is directly communicated with a steam inlet pipeline of a desulfurization tower.
In a preferred embodiment of the invention, the injection port duct, the motive steam inlet duct and the suction port access duct are provided with on-off valves, respectively.
In a preferred embodiment of the invention, the power steam inlet pipeline can be connected with medium pressure cylinder exhaust steam or auxiliary steam or one, two, three, four and five sections of extraction steam of a steam turbine or cold section reheating steam of the steam turbine.
In a preferred embodiment of the invention, the suction inlet access duct sucks the atmosphere directly.
In a preferred embodiment of the present invention, the matching system further comprises a heat recovery system, an air inlet of the heat recovery system is connected with the jet port pipeline, and an air outlet of the heat recovery system is communicated with the steam inlet pipeline of the desulfurizing tower.
The beneficial effects of the invention are as follows:
the invention can not only reduce the electricity consumption rate of the desulfurization plant, reduce noise and maintenance, but also realize heat recycling and improve the efficiency of the steam turbine.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural diagram of an optimization scheme of the present invention.
Detailed Description
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
The invention provides an intelligent matching method for desulfurization and oxidation air quantity, which comprises the following steps: the power steam is used for injecting air, and the air is directly introduced into limestone slurry of a desulfurizing tower after being boosted, so that the limestone slurry is used for oxidizing calcium sulfite of the desulfurizing tower.
The following is the desulfurization reaction in the desulfurizing tower through directly leading into the limestone slurry of the desulfurizing tower after the air is pressurized:
SO 2 +H 2 O＝H 2 SO 3 (absorption reaction)
CaCO 3 +H 2 SO 3 ＝CaSO 3 +CO 2 +H 2 O (acid-base neutralization reaction)
CaSO 3 +1/2O 2 ＝CaSO 4 (oxidation reaction)
CaSO 3 +1/2H 2 O＝CaSO 3 ·1/2H 2 O (Crystal)
CaSO 4 +2H 2 O＝CaSO 4 ·2H 2 O (Crystal)
CaSO 3 +H 2 SO 3 ＝Ca(HSO 3 ) 2 (pH control)
The power steam in this application can directly introduce the power steam that produces in the existing equipment, and need not oneself produce, specifically can be the first, second, three, four, five sections extraction steam of middling pressure jar exhaust steam or auxiliary steam or steam turbine's cold segment reheat steam etc. only need can with the air boost, like this greatly reduced the cost with carry out the resource recycle, protected the environment.
In addition, because the application realizes desulfurizing tower calcium sulfite through directly putting the lime stone thick liquid of desulfurizing tower into with the air after the pressure boost, this application accessible intelligent regulation intake air volume comes control desulfurizing tower interior calcium sulfite concentration, and it is very convenient to use.
Therefore, the implementation of the method can replace the existing desulfurization fan, so that noise pollution can be avoided, and maintenance and power consumption are reduced.
Because, draw the air through power steam and draw in the air, will air boost, but can exist very big heat in the air after the pressure boost, and desulfurizing tower calcium sulfite does not need these heat, and the equipment of drawing out power steam nevertheless needs these heat, this application still provides an optimization scheme:
the air after pressure boosting is firstly not directly connected into the limestone slurry of the desulfurizing tower, but is firstly subjected to heat recovery, the air after heat recovery is then connected into the limestone slurry of the desulfurizing tower, and the recovered heat can be discharged into equipment for extracting power steam, so that energy sources can be greatly saved.
Referring to fig. 1, based on implementation of the above method, the present application further provides an intelligent matching system for desulfurization and oxidation air quantity, which includes a steam injector 100.
A motive steam inlet pipe 110, a suction inlet pipe 120, and an injection port pipe 130 are provided on the steam ejector 100, respectively.
The power steam inlet pipe 110 may be directly connected to an existing medium pressure cylinder, a turbine, etc., and the medium pressure cylinder exhaust steam or auxiliary steam or one, two, three, four, five-stage extraction steam of the turbine or cold stage reheat steam of the turbine may be directly discharged into the steam ejector 100.
The suction port is connected to the pipe 120 to directly suck the atmosphere, and after the power steam enters the steam injector 100, suction force is generated in the steam injector 100, and air outside is sucked through the suction port and connected to the pipe 120, and the air enters the steam injector 100 to be boosted.
The injection port duct 130 is directly communicated with the steam inlet duct 210 of the desulfurizing tower 200, and the air boosted in the steam injector 100 can be directly discharged into the desulfurizing tower 200 through the injection port duct 130, thereby realizing desulfurization.
The injection port pipe 130 is provided with an on-off valve 140, and the on-off valve 140 controls the flow rate of the gas flowing into the desulfurizing tower 200, thereby controlling the calcium sulfite concentration in the desulfurizing tower.
Likewise, on-off valves may be provided on the motive steam inlet conduit 110 and the suction inlet conduit 120, respectively, to facilitate regulation of the air pressure of the air within the steam injector 100.
The steam inlet pipeline 210 of the existing desulfurizing tower 200 is generally directly and respectively connected with the outlet pipelines 310 of the oxidizing blowers 300, and in this application, a three-way valve can be arranged on the steam inlet pipeline 210, one end of the three-way valve is connected with the outlet pipeline 310 of the oxidizing blowers 300, and the other end of the three-way valve is connected with the jet pipeline 130, so that the switching between the oxidizing blowers 300 and the steam ejectors 100 can be realized through the three-way valve, and the situation that the power steam introduced by the steam ejectors 100 is too little or not enough is prevented, thereby delaying the operation of the desulfurizing tower 200 is avoided.
Referring to fig. 2, based on implementation of the above scheme, the present application further improves a preferred scheme, which further includes a heat recovery system 400.
The heat recovery system 400, specifically a heat exchanger, is of an existing structure, the air inlet of the heat recovery system is connected with the jet port pipeline 130, the air outlet of the heat recovery system is communicated with the steam inlet pipeline 210 of the desulfurizing tower 200, the gas boosted in the steam ejector 100 firstly enters the heat recovery system 400 for heat recovery, and the recovered gas can be discharged into the desulfurizing tower 200 through the steam inlet pipeline 210 for desulfurizing, so that resources are greatly saved.
For heat recovery of heat recovery system 400, the present application provides an example of a specific application:
the fifth section of extraction steam of the steam turbine is extracted by the power steam of the steam injector 100, the heat recovery system 400 and the low-temperature economizer 520 are arranged in parallel, the heat recovery system 400 and the low-temperature economizer 520 are respectively connected with the shaft seal heater 510 through pipelines, the shaft seal heater 510 is connected with the condensed water pipeline 511 through pipelines, condensed water can respectively enter the heat recovery system 400 and the low-temperature economizer 520 through the shaft seal heater 510, condensed water after heat exchange and condensed water after passing through the low-temperature economizer 520 are discharged between the sixth low-pressure heater 530 and the fifth low-pressure heater 540 of the steam turbine, and then are discharged into the fifth section of extraction steam of the steam turbine, so that the five sections of steam discharge amount of the steam turbine can be greatly reduced, the steam turbine efficiency is improved, and the heat recovery and utilization are realized.
Through implementation of the scheme, the following effects can be achieved:
(1) The air under the atmospheric pressure is ejected by using the power steam, only a small amount of power steam is needed, no electricity is consumed, and the electricity consumption of a desulfurization plant is greatly reduced;
(2) The air quantity entering the desulfurizing tower is intelligently regulated according to the concentration of calcium sulfite in the desulfurizing tower, so that intelligent control is realized;
(3) The steam injector belongs to non-rotating equipment, the maintenance amount is extremely low, and the maintenance cost and the cost are saved;
(4) The noise of the steam ejector is below 85dB (A), so that the noise influence is effectively reduced;
(5) The steam at the outlet of the steam ejector is cooled by the condensed water, so that heat recovery and reutilization are realized, and high-quality steam consumption is saved;
(6) The steam injection technology is applied to the desulfurization system to completely replace the use of an original oxidation fan, so that the power consumption of a desulfurization plant is reduced.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The intelligent matching method for the desulfurization and oxidation air quantity is characterized by comprising the following steps of: the method comprises the steps of injecting air by using power steam to replace a desulfurization fan, boosting the air by using the power steam to inject the air, then recovering heat in the boosted air, discharging the recovered heat into equipment for extracting the power steam, and then introducing the recovered heat into limestone slurry of a desulfurization tower; the matching method comprises the steps that the amount of the inlet air is intelligently adjusted according to the concentration of calcium sulfite in the desulfurizing tower, a matching system adopted by the matching method comprises a steam injector and a heat recovery system, wherein a power steam inlet pipeline, a suction port access pipeline and an injection port pipeline are respectively arranged on the steam injector, an air inlet of the heat recovery system is connected with the injection port pipeline, and an air outlet of the heat recovery system is communicated with an air inlet pipeline of the desulfurizing tower; the heat recovery system and the low-temperature economizer are connected in parallel, the heat recovery system and the low-temperature economizer are respectively connected with a shaft seal heater through a pipeline, the shaft seal heater is connected with a condensate pipeline through a pipeline, condensate water enters the heat recovery system and the low-temperature economizer respectively through the shaft seal heater, and the condensate water after heat exchange and the condensate water after the low-temperature economizer are discharged between a sixth low-pressure heater and a fifth low-pressure heater of the steam turbine together and then are discharged into five sections of steam extraction of the steam turbine; and the power steam inlet pipeline is connected with the exhaust steam of the medium pressure cylinder or auxiliary steam or the first, second, third, fourth and fifth sections of extraction steam of the steam turbine or the cold section reheating steam of the steam turbine.
2. The intelligent matching method for the desulfurization and oxidation air quantity according to claim 1, wherein the jet orifice pipeline, the power steam inlet pipeline and the suction inlet access pipeline are respectively provided with a switch valve.
3. The intelligent matching method for the desulfurization and oxidation air quantity according to claim 1, wherein the suction port is connected with a pipeline to directly suck the atmosphere.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910303454 | 2019-04-16 | ||
| CN2019103034549 | 2019-04-16 |
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| Publication Number | Publication Date |
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| CN109985499A CN109985499A (en) | 2019-07-09 |
| CN109985499B true CN109985499B (en) | 2024-02-23 |
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| CN201910371816.8A Active CN109985499B (en) | 2019-04-16 | 2019-05-06 | Intelligent matching method and system for desulfurization and oxidation air quantity |
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| CN114073888B (en) * | 2020-08-14 | 2024-01-26 | 华电国际电力股份有限公司技术服务分公司 | Optimization method of oxidation wind system in limestone-gypsum wet desulfurization system |
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|---|---|---|---|---|
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| CN205850572U (en) * | 2016-07-15 | 2017-01-04 | 襄阳浩强环保设备有限公司 | Oxidation unit is sprayed outside fume desulfurizing tower |
| CN207203828U (en) * | 2017-03-06 | 2018-04-10 | 芜湖凯博环保科技股份有限公司 | A kind of environment-friendly type blast furnace slag comprehensive reutilization system |
-
2019
- 2019-05-06 CN CN201910371816.8A patent/CN109985499B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5084258A (en) * | 1988-10-24 | 1992-01-28 | Lin Ping Wha | Lin flue gas SOx /NOx removal process and its by-product utilization |
| CN1467015A (en) * | 2002-12-23 | 2004-01-14 | 吴忠标 | Energy-saving high effective desulfurizing and dust control method and equipment using remaining heat |
| CN1919424A (en) * | 2006-08-18 | 2007-02-28 | 中国环境科学研究院 | Energy-saving steam ejection, slaking, oxidation, and transportation integration apparatus |
| CN1935334A (en) * | 2006-10-10 | 2007-03-28 | 杨立 | Gas desulfurizing-regenerating technological method and equipment with remarkable energy-saving effect by liquid-phase catalyzed oxidation |
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