CN105344229A - Method using cooling tower circulating water as flue gas desulphurization system water - Google Patents
Method using cooling tower circulating water as flue gas desulphurization system water Download PDFInfo
- Publication number
- CN105344229A CN105344229A CN201410408014.7A CN201410408014A CN105344229A CN 105344229 A CN105344229 A CN 105344229A CN 201410408014 A CN201410408014 A CN 201410408014A CN 105344229 A CN105344229 A CN 105344229A
- Authority
- CN
- China
- Prior art keywords
- water
- desulphurization system
- circulating water
- tower
- cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method using cooling tower circulating water as flue gas desulphurization system water. The cooling tower circulating water is used as base water in a tower when a desulphurization system starts, the cooling tower circulating water is used to prepare a desulphurization agent when the desulphurization system starts for the first time, and the cooling tower circulating water is used to flush a demister and supplement technologic water to the desulfurization tower of the desulphurization system in the running process of the desulphurization system. Water used in a power plant system is reused to realize treatment of wastes by using wastes, so the resource consumption and the economy investment in the power plant system are reduced.
Description
Technical field
The invention belongs to resource and environment field, relate to and a kind ofly utilize the cooling-tower circulating water after process as the method for desulphurization system water.
Background technology
In the circulating cooling system of power plants generating electricity equipment, the water of cooled equipment or medium, is admitted in cooling tower and cools, and takes away by entering the heat that water sheds by tower air, is used for cooling device or medium again through overcooled water.In cooling procedure due to moisture constantly evaporated, wind, recirculated water is concentrated, and to cause in water contained salinity to increase; Recirculated water is except being concentrated, and the dust in air and some pernicious gases (as SO2) also can enter recirculated water; Comprehensive above factor, cooling-tower circulating water needs to carry out periodical blowdown, to reduce the concentration rate of recirculated water.Control to calculate 3 according to concentration rate, its blowdown flow rate per hour is about 0.3% of internal circulating load per hour.For the unit of a 300MW, its cooling-tower circulating water amount is about 54000t/h, and water amount of blowdown calculates according to 0.3%, and its water amount of blowdown per hour is 162t.
Traditional cooling-tower circulating water is treated to directly outer row or reuse after agent-feeding treatment, namely pollutes environment and too increases economic input simultaneously.
Recirculated cooling water is according to the difference of concentration rate, and its various composition range is:
| Composition | Scope |
| Chlorion | 250 |
| Calcium ion | 200 |
| Magnesium ion | 300 |
| Phosphorus | 0.8 |
| Total alkalinity | 6.0 |
| pH | Value |
Application number be 200710156609.8 Chinese invention patent disclose a kind of tower external oxidation lime/calcium carbide
Slag-gypsum sulfur removal technology and device, wherein refer to utilize and in oxidation tank, pass into initial flue gas to adjust the pH value of slurries in tank, and pass into oxygen and be oxidized.
According to the emission standard of air pollutants for boilers regulation that national standard number is GB13271-2001, coal-burning boiler dust emission standard is that outlet reaches 100-350mg/m3, and general desulfurizing tower can remove the dust of 50 ~ 80% again after deduster.
For typical wet desulfurization of flue gas by limestone-gypsum method technique, its desulfurization water water quality requirement suspension is less than 200mg/L, chlorion during normal operation in desulphurization system ensures at below 20000mg/L, according to the outer discharge capacity of chlorine ion concentration change adjustment desulfurization wastewater.
Calcium sulfite adhesiveness is stronger, in desulphurization system running, be easily attached on demister surface, easy fouling after long-play.
Traditional desulphurization system water is middle water, and water consumption is large.For a typical Limestone-gypsum Wet Flue Gas Desulfurization Process system of 300MW unit, due to desulphurization system in running, have moisture to evaporate, carry secretly, output plaster splint goes out portion of water, desulphurization system waste water is arranged outward etc., and reason needs to carry out moisturizing to desulphurization system, prepare use water, mist eliminator flushing water mainly through desulfurizing agent, carry out moisturizing directly to modes such as moisturizings in tower, its water consumption is about 120t/h.
Summary of the invention
The invention provides and a kind ofly utilize the cooling-tower circulating water after process as the method for desulphurization system water.
A kind of cooling-tower circulating water that utilizes is as the method for flue gas desulphurization system water, comprise basic water in tower when utilizing cooling-tower circulating water to start as desulphurization system, utilize recirculated water to prepare desulfurizing agent during initial start-up system, circulating water flushing demister can also be utilized in desulphurization system running and supplement fresh water (FW) in the desulfurizing tower of desulphurization system.
In described tower basic water be desulphurization system when starting shipment in order to ensure the water level that equipment normally runs.
The described recirculated water that utilizes prepares desulfurizing agent for utilizing the desulfurizing agents such as recirculated water dissolving lime stone, lime, white clay, carbide slag.
Utilize circulating water flushing demister for rinsing the solid in the surperficial doctor solution sticked of demister with water in desulphurization system normal course of operation.
Fresh water (FW) is supplemented for maintaining the water in tower needed for liquid level in the desulfurizing tower of desulphurization system.
Recirculated water preferably carries out pretreatment before use, utilizes the flue gas after flue gas desulphurization system process to blast in recirculated water, makes the pH value of recirculated water be 2.0 ~ 5.0.After system startup optimization, start to start recirculated water pretreatment system, (exiting flue gas its dustiness after deduster and the dual dedusting of desulphurization system is low to utilize JBR device to introduce absorption tower exiting flue gas, do not affect water quality) reduce the pH value of water, pH value controls between 2.0 ~ 5.0, and blast compressed air oxidation reducing substances wherein, such as phosphorus; Be oxidized the sulphite wherein generated, such as calcium sulfite, magnesium sulfite, be oxidized to calcium sulfate and magnesium sulfate, prevents from being attached on demister causing fouling.
Utilize the circulating water flushing demister after process in desulphurization system running, the calcium sulfite pickling be attached on demister when flushing demister at the water of 2.0 ~ 5.0 can effectively be dissolved and rinse down by pH value.
Due to that reducing substances is fully oxidized, avoid reducing substances being brought into during desulphurization system moisturizing
Desulphurization system.
Due to that reducing substances is fully oxidized, avoid and bring reducing substances into desulphurization system when preparing desulfurizing agent.
Introduce the flue gas of salification cycles water after recirculated water desulfurization, sulfur dioxide concentration reduces further, when whole desulphurization system reaches same desulfuration efficiency, decreases the consumption of partial desulfurization agent.
The inventive method, its advantage is to reuse in power plant system with water, and the treatment of wastes with processes of wastes against one another, decreases intrasystem resource consumption and economic input.Relative to traditional using the processing mode of middle water as desulfurization water and cooling-tower circulating water, this method at least reduces one cooling-tower circulating water handling process, decreases part water consumption, to zero-emission target further; Utilize the water of low ph value to rinse demister, the fouling cycle of demister is extended greatly; Recirculated water is carried out fully oxidized, avoids and the slurries oxidation in desulphurization system is impacted.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart.
Detailed description of the invention
Desulphurization system is when first time starts shipment, each needs with water section directly untreated recirculated water to be transported to desulphurization system, after system starts shipment input flue gas, according to following process flow operation: the cooling-tower circulating water in cooling tower 1 is transferred pump 3 and extracts out from collecting-tank 2, be transported to pretreatment tank 5, pretreatment tank overflows in fresh water (FW) holding vessel 6, then by technique water pump
7 extract a point two-way out, one tunnel is transmitted back to pretreatment tank and returns stream 8 to ensure the liquid level in pretreatment tank, desulphurization system is gone on one tunnel, pretreatment air-introduced machine 16 is drawn a road flue gas from absorption tower exhaust pass 18 and is transported in pretreatment tank 5 and carries out JBR to reduce pH value to recirculated water wherein, after being disposed, flue gas gets back to 17 exhaust pass 18, compressed air blasts in pretreatment tank 5, to be oxidized reducing substances wherein by the oxidation fan of pretreatment simultaneously 4; Technique water pump 7 delivery technology water is to desulphurization system, and it is divided into three tunnels, and a road is gone to 10 ashing tank 11, roads and gone to 9 absorption tower 14 moisturizings, and 12 flushing demisters 15 are gone on a road.
Liquid level gauge or automatically controlled ball float are installed in fresh water (FW) storage tank 6, the start and stop of delivery pump 3 are according to the Liquid level of fresh water (FW) storage tank 6, in pretreatment tank 5, pH meter is installed, 19 is automatically controlled baffle door, its aperture controls according to the pH value in pretreatment tank 5, and being in the pH value ensureing in pretreatment tank 5 needs scope; Pretreatment oxidation fan 4 is often opened; Technique water pump 7 is often opened, and returns stream 8 to control liquid level in pretreatment tank 5 to ensure JBR effect in pretreatment tank 5; The pipeline going to desulphurization system is controlled by electrically operated valve 13, needs to open electrically operated valve 13 with when water, otherwise close in desulphurization system; Pretreatment tank 5 and fresh water (FW) storage tank 6 do not arrange stirring; Wherein 19 is adsorption tower smoke entrance.
The volume of described pretreatment tank 5 is equivalent to the desulphurization system water consumption of 0.2 ~ 1 hour, determines according to cooling-tower circulating water matter; Acidifying exhaust gas volumn in described pretreatment tank 5 is 7 ~ 35% of absorption tower exiting flue gas amount, determines according to cooling-tower circulating water matter.
Embodiment 1
Certain power plant 7 130t/h boilers, it is 2 that its cooling-tower circulating water controls concentration rate, pH value is 8.2, chlorion is 480mg/L, and calcium ion is 250mg/L, and phosphorus is 1.56mg/L, total alkalinity is 8.2mmol/L, the transformation front sewage disposal water yield is 200t/h, and desulphurization system water consumption is 100t/h, and water amount of blowdown meets desulfurization water consumption; After transformation desulfurization water, cooling circulating water blowdown flow rate reduces to 80t/h, and total water blowdown flow rate reduces 100t/h, and improvement expenses is 100,000 yuan, and the annual water consumption that reduces amounts to about 240,000 yuan, reduces desulfurizing agent expense 2.9 ten thousand yuan.System and equipment normal operation.
Claims (2)
1. one kind utilizes cooling-tower circulating water as the method for flue gas desulphurization system water, it is characterized in that: basic water in the tower comprising desulfurizing tower when utilizing cooling-tower circulating water to start as desulphurization system, utilize cooling-tower circulating water to prepare desulfurizing agent during initial start-up desulphurization system, utilize pretreated cooling-tower circulating water to rinse demister in desulphurization system running and supplement fresh water (FW) in the desulfurizing tower of desulphurization system;
The described recirculated water that utilizes prepares desulfurizing agent for utilizing recirculated water dissolving desulfurizing agent;
Described preprocess method is: the flue gas after flue gas desulphurization system process and compressed air are blasted in cooling-tower circulating water.
2. the method for claim 1, is characterized in that: the pH value of pretreated cooling-tower circulating water is 2.0 ~ 5.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410408014.7A CN105344229A (en) | 2014-08-19 | 2014-08-19 | Method using cooling tower circulating water as flue gas desulphurization system water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410408014.7A CN105344229A (en) | 2014-08-19 | 2014-08-19 | Method using cooling tower circulating water as flue gas desulphurization system water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105344229A true CN105344229A (en) | 2016-02-24 |
Family
ID=55320371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410408014.7A Pending CN105344229A (en) | 2014-08-19 | 2014-08-19 | Method using cooling tower circulating water as flue gas desulphurization system water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105344229A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106039755A (en) * | 2016-07-22 | 2016-10-26 | 内蒙古京能锡林发电有限公司 | Flue gas condensing water-extracting system |
| CN113797734A (en) * | 2021-09-30 | 2021-12-17 | 鲍倩 | Device and method for treating flue gas |
| WO2023142170A1 (en) * | 2022-01-25 | 2023-08-03 | 国网河北省电力有限公司电力科学研究院 | Method and system for reusing circulating water sewage as desulfurization process water |
-
2014
- 2014-08-19 CN CN201410408014.7A patent/CN105344229A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106039755A (en) * | 2016-07-22 | 2016-10-26 | 内蒙古京能锡林发电有限公司 | Flue gas condensing water-extracting system |
| CN113797734A (en) * | 2021-09-30 | 2021-12-17 | 鲍倩 | Device and method for treating flue gas |
| WO2023142170A1 (en) * | 2022-01-25 | 2023-08-03 | 国网河北省电力有限公司电力科学研究院 | Method and system for reusing circulating water sewage as desulfurization process water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206580583U (en) | FGD wastewater zero discharge systems | |
| EA029429B1 (en) | Method for treating flue gas and apparatus for treating acidic tail gas by using ammonia process | |
| CN102343203B (en) | Method for purifying harmful substances in smoke produced by combustion of boiler | |
| CN102343206A (en) | Treatment method and treatment facilities of exhaust gas | |
| CN106587231A (en) | FGD wastewater zero discharge system | |
| JP6462359B2 (en) | Method and apparatus for desulfurization of exhaust gas containing sulfurous acid gas | |
| CN102357337A (en) | Desulphurization technology through sodium-calcium dual-alkali method | |
| CN106178896A (en) | The desulfurizer of a kind of ammonia circulation utilization and method | |
| CN202113765U (en) | Boiler fume treatment system | |
| CN105344229A (en) | Method using cooling tower circulating water as flue gas desulphurization system water | |
| CN104971602A (en) | Sintering flue gas desulfurization and denitrification method based on limestone-gypsum method | |
| CN109110846B (en) | Desulfurization wastewater flue gas concentration reduction and cementing fixing system and process | |
| CN203355578U (en) | Flue gas desulfurizer adopting magnesium method for sintering machine | |
| CN101642667B (en) | Method for using cooling-tower circulating water as water used by flue gas desulfurization system | |
| CN103721551B (en) | Boiler flue gas desulfurization, denitration, demercuration integrated purifying equipment | |
| CN109589750A (en) | Fluorine technique is gone in a kind of economical desulfurization of aluminium electrolytic flue | |
| CN107398165A (en) | A kind of desulfurizing and denitrifying process of boiler smoke | |
| KR20150032491A (en) | Method and system for seawater foam control | |
| CN110668610A (en) | Desulfurization wastewater emission reduction and water quality treatment recycling process device | |
| CN206810042U (en) | A kind of ammonia process of desulfurization double-cycle process and device | |
| CN108083370A (en) | The flue vapo(u)rization system and method for evaporating of desulfurization wastewater | |
| CN106807207A (en) | A kind of method by the use of cooling-tower circulating water as flue gas desulphurization system water | |
| JP2007050334A (en) | Exhaust gas purification method and facility | |
| CN210065435U (en) | Low PH flue evaporation plant | |
| CN201880479U (en) | Seawater desulfurization device for boiler flue gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160224 |