CN203848310U - System using flue gas waste heat for treating tail end waste water - Google Patents
System using flue gas waste heat for treating tail end waste water Download PDFInfo
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- CN203848310U CN203848310U CN201420258842.2U CN201420258842U CN203848310U CN 203848310 U CN203848310 U CN 203848310U CN 201420258842 U CN201420258842 U CN 201420258842U CN 203848310 U CN203848310 U CN 203848310U
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- Prior art keywords
- waste water
- flue gas
- communicated
- tail end
- waste
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- 239000002351 wastewater Substances 0.000 title claims abstract description 102
- 239000002918 waste heat Substances 0.000 title claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title abstract description 49
- 239000003546 flue gas Substances 0.000 title abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 22
- 239000003517 fume Substances 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 abstract description 34
- 238000005507 spraying Methods 0.000 abstract description 6
- 239000012716 precipitator Substances 0.000 abstract 3
- 230000000694 effects Effects 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 abstract 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005496 tempering Methods 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 16
- 230000023556 desulfurization Effects 0.000 description 15
- 238000000889 atomisation Methods 0.000 description 13
- 230000008020 evaporation Effects 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 11
- 239000008187 granular material Substances 0.000 description 10
- 230000003750 conditioning effect Effects 0.000 description 9
- 239000002244 precipitate Substances 0.000 description 8
- 239000002826 coolant Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a system using flue gas waste heat for treating tail end waste water. The system comprises an economizer, an air preheating device, a flue gas cooler, an electric dust precipitator, a desulfurizing tower, a waste water pre-treating device and a waste water spraying evaporator, wherein the economizer, the air preheating device, the flue gas cooler, the electric dust precipitator, the desulfurizing tower, the waste water pre-treating device and the waste water spraying evaporator are sequentially communicated through a pipeline. A waste water pump is arranged on a pipeline which is communicated with the waste water pre-treating device and the waste water spraying evaporator. A flue gas inlet of the waste water spraying evaporator is communicated with a pipeline between the economizer and the air preheating device. A hot water outlet of the flue gas cooler is communicated with a waste heat air heater through a circulation pump. A hot air outlet of the waste heat air heater is communicated with the air preheating device. A flue gas outlet of the waste water spraying evaporator is communicated with the electric dust precipitator through the flue gas cooler. While the tail end waste water is treated, flue gas hardening and tempering are performed, the flue gas temperature is reduced, the dust precipitation effect is improved, dust precipitation is achieved at low temperature, desulfurizing water consumption is reduced, the system has energy-saving, water-saving and environmentally friendly effects, and therefore zero discharging of waste water of a power plant is really achieved.
Description
Technical field
The utility model belongs to fume afterheat utilization and tail end wastewater processing technology field, is specifically related to a kind of system of utilizing fume afterheat to process tail end wastewater.
Background technology
The SO of coal-burning power plant had further improved in China in recent years
2, NO
xand the discharge standard of flue dust, reach and be even better than international advanced standard.For emission compliance, power plant has adopted many new technologies in the application of electric cleaner both at home and abroad, can improve under certain conditions efficiency of dust collection, reduce smoke dust discharge concentration, has wherein comprised flue gas conditioning and low low temp. electric dedusting technology.
Flue gas conditioning adjustment be flue gas, essence is for the dust in flue gas.By adjusting component and the certain physical characteristics of flue gas or exhaust gas dust, thereby the physicochemical characteristics of reduction dust specific resistance or change dust improves dust collection efficiency.The application of flue gas conditioning technology, thoroughly changes the dedusting technology pattern of traditional electrical dedusting passive adaptation dust, duty parameter, is the revolutionary technology of electrostatic precipitation technology.
Low low temp. electric deduster technology is that electric cleaner entrance flue gas temperature is reduced to below acid dew point, can effectively reduce dust specific resistance, reduces flue gas volume flow, improves efficiency of dust collection, deduster can be exported to dust concentration and be controlled at 30mg/m
3in.
In China's active service fired power generating unit, exhaust gas temperature generally maintains 125～150 ℃ of left and right horizontal, and high fume temperature is a universal phenomenon.If effectively reduce deduster entrance flue gas temperature, flue gas is carried out modifiedly simultaneously, change component and the physical property of flue dust, thereby low low temp. electric dedusting and flue gas conditioning are combined, the comprehensive dust collector efficiency that improves, likely, under existing equipment condition, meets dust concentration 20mg/m
3emission request.
Meanwhile, in recent years for saving water resource and preventing water pollution, many thermal power plants require the waste water zero emission design of An Quan factory.For meeting material balance in the normal operation of desulphurization system and system, need discharge desulfurization wastewater.The general water temperature of desulfurization wastewater is at 40～50 ℃, and its water quality salt content is high, and the water quality inferiority opposite sex is large, has the features such as severe corrosive and easy fouling.Power plant processes general three headers that adopt of desulfurization wastewater at present, and heavy metals and suspension are removed, and is discharged into grey or coal yard after processing, and this is a kind of vacation " zero-emission ".
The technique of existing realization " zero-emission " generally adopts salt solution concentration and evaporation and crystallization technique to carry out advanced treating.95% waste water can be converted into high-purity distilled water, and the high quality distilled water of generation can be used for boiler replenishing water, cooling tower moisturizing, other water for industrial uses etc.; Remaining 5% is high concentration slurries, can deliver to the small-sized pond evaporation of tanning by the sun, or being processed into solid particle in crystallizer or spray dryer, final salinity residue solid is generally used as common solid waste, according to its composition recoverable or the method such as bury, processes.This investment in machinery and equipment cost is high, and operating cost is high, ton water treatment expense units up to a hundred, and only there are 5 left and right in the power plant that the whole world adopts this technology to carry out desulfurization wastewater processing.
Spraying is dry is that fluidization technique is for a kind of dry method of liquid material.It is that liquid material is concentrated into after suitable density, is atomized into fine mist, carries out heat exchange with the thermal current of certain flow rate, and moisture is evaporated rapidly, the powdered or granular method of dry materials.Mixing with hot flue gas after tail end wastewater atomization, utilize the waste heat of flue gas to make moisture rapid evaporation, the salt in water can remove along with flue gas enters deduster by crystallization formation particle, meanwhile, utilizes atomized drop evaporation to absorb heat, can reduce flue-gas temperature.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the purpose of this utility model is to provide a kind of system of utilizing fume afterheat to process tail end wastewater, the utility model carries out flue gas conditioning and reduces cigarette temperature when processing tail end wastewater, improved efficiency of dust collection, realized low temperature dedusting, reduce desulfurization water consumption, had the benefit of energy-conservation, water saving, environmental protection three aspects: concurrently, really realized power plant effluent " zero-emission ".
To achieve these goals, the utility model is by the following technical solutions:
A kind of system of utilizing fume afterheat to process tail end wastewater, comprise the economizer 1 being communicated with successively by pipeline, air preheater 2, gas cooler 3, electric cleaner 6, desulfurizing tower 7, Wastewater Pretreatment device 8 and waste water spray evaporator 10, on the pipeline that is communicated with Wastewater Pretreatment device 8 and waste water spray evaporator 10, be provided with waste water pump 9, the pipeline connection that the smoke inlet of described waste water spray evaporator 10 and economizer 1 and air preheater are 2, the hot water outlet of described gas cooler 3 is communicated with by circulating pump 4 and air heater using waste heat 5, the hot air outlet of described air heater using waste heat 5 and air preheater 2 are communicated with, the exhanst gas outlet of described waste water spray evaporator 10 is communicated with by gas cooler 3 and electric cleaner 6.
System described above utilizes fume afterheat to process the method for tail end wastewater, comprises the steps:
Step 1: desulfurizing tower 7 produces waste water to carry out after pretreatment, in waste water pump 9 is delivered to waste water spray evaporator 10 in Wastewater Pretreatment device 8;
Step 2: pretreated waste water, in the interior uniform atomizing of waste water spray evaporator 10, forms atomization waste water drop, and atomization waste water size droplet diameter is less than 100 μ m;
Step 3 a: part also passes in waste water spray evaporator 10 from the hot flue gas between economizer 1 and air preheater 2, and the atomization waste water droplets mixing forming with step 2, make the evaporation of being heated of atomization waste water drop, salts substances in atomization waste water drop is constantly separated out in evaporation process, and the dust granules in a part of salt precipitate and hot flue gas is discharged by waste water spray evaporator 10; Another part is attached to the salt precipitate on dust granules, has changed the physicochemical characteristic of dust granules, falls low resistivity, improves dust collection efficiency, and meanwhile, thereby atomization waste water drop evaporation endothermic reduces hot flue-gas temperature;
Step 4: step 3 gained flue gas flows in gas cooler 3 and heats coolant media of water, flue-gas temperature is further reduced, realize low temperature dedusting, simultaneously, coolant media of water in gas cooler 3 is heated, and gained hot water is delivered to air heater using waste heat 5 through circulating pump 4, makes cold air heat temperature raising, avoid the wind-warm syndrome that the gas bypass between economizer 1 and air preheater 2 causes to reduce, realized flue gas heat recovery;
Step 5: after step 4 flows into and to heat the cooling of coolant media of water gained in gas cooler 3, flue gas passes into electric cleaner 6, in step 3 waste water spray evaporator 10 undischarged salt precipitate and dust granules in electric cleaner 6 by together with trap;
Step 6: the flue gas of step 5 gained after dedusting flows into desulfurizing tower 7 and carry out desulfurization processing, because cigarette temperature is lower, can reduce desulfurization water consumption effectively;
Step 7: the waste water that step 6 produces after desulfurization is processed is delivered to and carried out pretreatment in Wastewater Pretreatment device 8; Thereby constantly repeat the realization of above step 1～7 and carry out flue gas conditioning when processing tail end wastewater, reduce flue-gas temperature, improve efficiency of dust collection, reduce desulfurization water consumption, make limited water resource be able to efficient circulation utilization in power plant, really realize " zero-emission " of power plant effluent.
Tail end wastewater described in step 7 be desulfurization wastewater or with the mixing material of other technique waste water.
The utility model compared to the prior art, possesses following advantage:
1. the utility model, when processing tail end wastewater, carries out flue gas conditioning, reduces cigarette temperature, and the water that has improved efficiency of dust collection and effectively reduced follow-up sulfur removal technology consumes, and has realized the cycling and reutilization of tail end wastewater, really accomplishes power plant effluent " zero-emission ".
2. the utility model tail end wastewater uniform atomizing mixing with hot flue gas in waste water spray evaporator, utilize waste water spray evaporator to carry out flue gas conditioning and reduce cigarette temperature, in waste water, saline pollution thing is constantly separated out in evaporation process simultaneously, part salt precipitate and dust granules are discharged in waste water spray evaporator, the salt precipitate not draining is trapped by existing electric cleaner together with dust granules, therefore the utility model has saved traditional desulfuration waste water treatment process of high operating cost with high investment.
3. the tail end wastewater spray evaporator that the utility model adopts is an autonomous system, can regulate neatly operation conditions according to boiler actual load, have extremely strong adaptive capacity, this tail end wastewater spray evaporation system can discontinuous operation be convenient to system maintenance simultaneously.
Accompanying drawing explanation
Accompanying drawing is the utility model system schematic.
The specific embodiment
Below in conjunction with the specific embodiment, the utility model is described in more detail.
As shown in drawings, a kind of system of utilizing fume afterheat to process tail end wastewater of the utility model, comprise the economizer 1 being communicated with successively by pipeline, air preheater 2, gas cooler 3, electric cleaner 6, desulfurizing tower 7, Wastewater Pretreatment device 8 and waste water spray evaporator 10, on the pipeline that is communicated with Wastewater Pretreatment device 8 and waste water spray evaporator 10, be provided with waste water pump 9, the pipeline connection that the smoke inlet of described waste water spray evaporator 10 and economizer 1 and air preheater are 2, the hot water outlet of described gas cooler 3 is communicated with by circulating pump 4 and air heater using waste heat 5, the hot air outlet of described air heater using waste heat 5 and air preheater 2 are communicated with, the exhanst gas outlet of described waste water spray evaporator 10 is communicated with by gas cooler 3 and electric cleaner 6.
As shown in drawings, utilize fume afterheat to process the method for tail end wastewater, comprise the steps:
Step 1: desulfurizing tower 7 produces waste water to carry out after pretreatment, in waste water pump 9 is delivered to waste water spray evaporator 10 in Wastewater Pretreatment device 8;
Step 2: pretreated waste water, in the interior uniform atomizing of waste water spray evaporator 10, forms atomization waste water drop, and atomization waste water size droplet diameter is less than 100 μ m;
Step 3 a: part also passes in waste water spray evaporator 10 from the hot flue gas between economizer 1 and air preheater 2, and the atomization waste water droplets mixing forming with step 2, make the evaporation of being heated of atomization waste water drop, salts substances in atomization waste water drop is constantly separated out in evaporation process, and the dust granules in a part of salt precipitate and hot flue gas is discharged by waste water spray evaporator 10; Another part is attached to the salt precipitate on dust granules, has changed the physicochemical characteristic of dust granules, falls low resistivity, improves dust collection efficiency, and meanwhile, thereby atomization waste water drop evaporation endothermic reduces hot flue-gas temperature;
Step 4: step 3 gained flue gas flows in gas cooler 3 and heats coolant media of water, flue-gas temperature is further reduced, realize low temperature dedusting, simultaneously, coolant media of water in gas cooler 3 is heated, and gained hot water is delivered to air heater using waste heat 5 through circulating pump 4, makes cold air heat temperature raising, avoid the wind-warm syndrome that the gas bypass between economizer 1 and air preheater 2 causes to reduce, realized flue gas heat recovery;
Step 5: after step 4 flows into and to heat the cooling of coolant media of water gained in gas cooler 3, flue gas passes into electric cleaner 6, in step 3 waste water spray evaporator 10 undischarged salt precipitate and dust granules in electric cleaner 6 by together with trap;
Step 6: the flue gas of step 5 gained after dedusting flows into desulfurizing tower 7 and carry out desulfurization processing, because cigarette temperature is lower, can reduce desulfurization water consumption effectively;
Step 7: the waste water that step 6 produces after desulfurization is processed is delivered to and carried out pretreatment in Wastewater Pretreatment device 8; Thereby constantly repeat the realization of above step 1～7 and carry out flue gas conditioning when processing tail end wastewater, reduce flue-gas temperature, improve efficiency of dust collection, reduce desulfurization water consumption, make limited water resource be able to efficient circulation utilization in power plant, really realize " zero-emission " of power plant effluent.
As preferred embodiment of the present utility model, the tail end wastewater described in step 7 be desulfurization wastewater or with the mixing material of other technique waste water.
Finally it should be noted that, the above embodiment is only used for the technical solution of the utility model is described and is unrestricted, those skilled in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (1)
1. a system of utilizing fume afterheat to process tail end wastewater, it is characterized in that: comprise the economizer (1) being communicated with successively by pipeline, air preheater (2), gas cooler (3), electric cleaner (6), desulfurizing tower (7), Wastewater Pretreatment device (8) and waste water spray evaporator (10), on the pipeline that is communicated with Wastewater Pretreatment device (8) and waste water spray evaporator (10), be provided with waste water pump (9), pipeline connection between the smoke inlet of described waste water spray evaporator (10) and economizer (1) and air preheater (2), the hot water outlet of described gas cooler (3) is communicated with by circulating pump (4) and air heater using waste heat (5), the hot air outlet of described air heater using waste heat (5) and air preheater (2) are communicated with, the exhanst gas outlet of described waste water spray evaporator (10) is by gas cooler (3) and and electric cleaner (6) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258842.2U CN203848310U (en) | 2014-05-20 | 2014-05-20 | System using flue gas waste heat for treating tail end waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420258842.2U CN203848310U (en) | 2014-05-20 | 2014-05-20 | System using flue gas waste heat for treating tail end waste water |
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| Publication Number | Publication Date |
|---|---|
| CN203848310U true CN203848310U (en) | 2014-09-24 |
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|---|---|---|---|
| CN201420258842.2U Expired - Fee Related CN203848310U (en) | 2014-05-20 | 2014-05-20 | System using flue gas waste heat for treating tail end waste water |
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| CN (1) | CN203848310U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982903A (en) * | 2014-05-20 | 2014-08-13 | 西安热工研究院有限公司 | System and method for treating tail end waste water by using smoke waste heat |
| CN106051805A (en) * | 2016-06-24 | 2016-10-26 | 福建龙净环保股份有限公司 | Waste heat recovery system and method with discharged smoke waste heat as heat source of air heater |
| CN109052526A (en) * | 2018-08-28 | 2018-12-21 | 盛发环保科技（厦门）有限公司 | Flue gas disappears white coupling high temperature bypass flue evaporation high slat-containing wastewater Zero discharging system |
-
2014
- 2014-05-20 CN CN201420258842.2U patent/CN203848310U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982903A (en) * | 2014-05-20 | 2014-08-13 | 西安热工研究院有限公司 | System and method for treating tail end waste water by using smoke waste heat |
| CN106051805A (en) * | 2016-06-24 | 2016-10-26 | 福建龙净环保股份有限公司 | Waste heat recovery system and method with discharged smoke waste heat as heat source of air heater |
| CN106051805B (en) * | 2016-06-24 | 2018-12-14 | 福建龙净环保股份有限公司 | A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source |
| CN109052526A (en) * | 2018-08-28 | 2018-12-21 | 盛发环保科技（厦门）有限公司 | Flue gas disappears white coupling high temperature bypass flue evaporation high slat-containing wastewater Zero discharging system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170103 Address after: 100031 Beijing, Xicheng District, the door of the revitalization of the main street, No. 6 Patentee after: Huaneng Power International,Inc. Patentee after: Xi'an Thermal Power Research Institute Co.,Ltd. Patentee after: TECHNOLOGY INNOVATION CENTER OF CHINA HUANENG Group Address before: 710032 Xingqing Road, Shaanxi, China, No. 136, No. Patentee before: Xi'an Thermal Power Research Institute Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20200520 |