CN206580583U - FGD wastewater zero discharge systems - Google Patents
FGD wastewater zero discharge systems Download PDFInfo
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- CN206580583U CN206580583U CN201720103428.8U CN201720103428U CN206580583U CN 206580583 U CN206580583 U CN 206580583U CN 201720103428 U CN201720103428 U CN 201720103428U CN 206580583 U CN206580583 U CN 206580583U
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Abstract
The utility model discloses a kind of FGD wastewater zero discharge systems, it is related to FGD technical field of waste water processing, including out of stock reactor, air preheater, desulfurization wastewater concentrates mechanism and thickened waste water crystallization mechanism, desulfurization wastewater concentration mechanism mainly includes a concentration tower, concentration tower is provided with gas approach, the gas approach is passed through again is evaporated concentration by the flue gas of electrostatic or sack cleaner to the desulfurization wastewater in concentration tower, thickened waste water crystallization mechanism mainly includes a high temperature crystallization tower, high temperature crystallization tower connects a crystallization feed pump and the concentration desulfurization wastewater in concentration tower is introduced into high temperature crystallization tower, high temperature crystallization tower is also provided with a gas approach, the high-temperature flue gas that the gas approach is introduced after Benitration reactor is crystallized to the desulfurization wastewater after concentration.Medicament sofening treatment is not needed, operation energy consumption is relatively low, makes full use of waste heat flue gas and SCR system high temperature flue gas in FGD systems.
Description
Technical field
The present invention relates to FGD technical field of waste water processing, and in particular to a kind of FGD wastewater zero discharge systems and its method.
Background technology
The wastewater source produced in wet method lime stone flue gas desulfurization course discharges water in absorption tower, in order to maintain desulfurizer
The balance of serum recycle system material, prevents flue gas soluble fraction i.e. cl concn from exceeding setting and ensures gypsum quality, it is necessary to
A certain amount of waste water is discharged from system, waste water is essentially from gypsum dehydration and purging system.
Waste water somewhat slant acidity, pH value is generally kept between 4-4.5；Concentration of suspension is very high (gypsum particle etc.),
Mass percent is up to tens of thousands of mg/L；Chloride, COD and heavy metals exceeding standard, salinity are high, containing substantial amounts of calcium ion, magnesium ion,
Chlorion, sulfate ion and sulfite ion etc..
Existing FGD waste water zero-discharge technologies, first have to carry out pretreatment softening, FDG waste water passes through feeding lime stone, carbon
Sour calcium, organic sulfur, flocculant aid, gravitational settling etc. pre-process, remove waste water in most suspension, heavy metal and fluorine from
The scale forming matters such as son, hardness, silica；Carrying out concentration, multiple-effect or mechanical compress recirculation evaporator concentration (MED
Or MVR)；Carrying out crystallization treatment, multiple-effect or mechanical compress recirculation evaporator concentration (MED or MVR) crystallization；At finally drying
Reason.
This method investment cost is high, ten thousand yuan/ton of waste water of system investments about 400-500；Operating cost is high, system energy consumption compared with
Height, consumes 300kg/ tons of waste water of steam, 30kw.h/ tons of waste water of power consumption；Pretreatment softening cost is high, softens 30-50 yuan/ton of cost
Waste water；Sludge quantity is larger, and softening dosage is 40kg/ tons of waste water, handles every 100 tons of waste water and produces about 20 tons of mud cakes.
The content of the invention
The technical problem to be solved in the present invention is to solve above-mentioned the deficiencies in the prior art, reduces the processing of FGD desulfurization wastewaters
Cost and energy consumption.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of FGD wastewater zero discharge systems, are fitted
For SCR system, including desulfurization wastewater concentration mechanism and thickened waste water crystallization mechanism, the high-concentration desulfurized waste water after concentration
Further crystallizing and drying is carried out into thickened waste water crystallization mechanism, in Benitration reactor high-temperature flue gas outlet to air preheater
Draw bypass connection thickened waste water crystallization mechanism on flue, the desulfurization wastewater concentration mechanism mainly includes a concentration tower, concentration
Tower be provided with gas approach, the gas approach connection SCR steam generator system air-introduced machines after gas bypass to the desulfurization wastewater in concentration tower
Concentration is evaporated, the thickened waste water crystallization mechanism mainly includes a high temperature crystallization tower, and high temperature crystallization tower connects a knot
Concentration desulfurization wastewater in concentration tower is introduced high temperature crystallization tower by brilliant feed pump, and high temperature crystallization tower is also provided with a gas approach,
The high-temperature flue gas that the gas approach is introduced after Benitration reactor is crystallized to the desulfurization wastewater after concentration.
Further, spraying layer is set in the concentration tower, and concentration tower, which connects a circulating and evaporating pump, will enter concentration tower
The desulfurization wastewater of bottom introduces spraying layer and sprayed.
Further, the concentration tower is also connected with the desulfurizing tower in a demister, demister connection FGD systems.
Further, the exhaust pass of thickened waste water crystallization mechanism is incorporated into steam generator system electrostatic or sack cleaner
Gas approach, the flue gas after dedusting is passed through concentration tower.
From above-mentioned technical proposal it can be seen that the present invention has advantages below：Do not need medicament sofening treatment, investment cost,
Operating cost, operation energy consumption are relatively low, and system is to utilize the flue of (low-level (stack-gas) economizer) between desulfurizing tower in residual heat from boiler fume
It is upper to set, waste heat flue gas and SCR system high temperature flue gas in FGD systems are made full use of, the energy is saved, and due to being not added with softening
Agent, sludge quantity is few.
Brief description of the drawings
The process flow chart of Fig. 1 present invention.
Embodiment
The embodiment of the present invention is elaborated below in conjunction with accompanying drawing.
As shown in figure 1, the FGD wastewater zero discharge systems of the present invention mainly include concentrating mechanism and thickened waste to desulfurization wastewater
Water crystallization mechanism, desulfurization wastewater concentration mechanism mainly includes a concentration tower, and concentration tower is provided with gas approach, and gas approach is used for
Introduce waste heat flue gas and concentration is evaporated to the desulfurization wastewater in concentration tower, waste heat flue gas is mainly derived from former steam generator system air inducing
Spraying layer is set in the waste heat flue gas (desulfurizing tower inlet flue gas) after machine, concentration tower, and concentration tower will be entered using circulating and evaporating pump
The desulfurization wastewater of concentration tower bottom introduces spraying layer and sprayed.
Thickened waste water crystallization mechanism mainly includes a high temperature crystallization tower, and high temperature crystallization tower connects a crystallization feed pump will
Concentration desulfurization wastewater in concentration tower introduces high temperature crystallization tower, and high temperature crystallization tower is also provided with a gas approach, the gas approach
The high-temperature flue gas introduced after SCR denitration reactor is used to crystallize the desulfurization wastewater after concentration, and high-temperature flue-gas exists
350 ° or so, high temperature crystallization tower exports fibre selection at 150 ° or so, again can introduce the flue gas discharged in high temperature crystallization tower
Dedusting collection is carried out to former boiler electrostatic or sack cleaner gas approach, the waste gas of discharge leads to together with the boiler waste gas of part
Enter concentration tower.
Desulfurization wastewater is imported into recycling waste water case, concentration tower is entered by waste water pump；Waste water in concentration tower passes through circulation
Waste water is sent into waste water sprayer unit by pump；The waste heat flue gas between deduster and desulfurizing tower is extracted, temperature is in 125 ° or so, used heat
Flue gas is entered in concentration tower by booster fan；Waste heat flue gas is being done with the vaporific desulfurization wastewater sprayed by waste water sprayer unit
Direct contact heat transfer in dry tower, is concentrated by evaporation vaporific desulfurization wastewater, wherein soluble-type salt reaches saturation or precipitation state；
Heat smoke after being contacted with vaporific desulfurization wastewater is changed into saturation wet flue gas, be discharged into after demister at the top of the concentration tower to
FGD desulfurizing towers；Slurry storage after concentration is in the underflow case of concentration tower bottom；Concentrate is pumped into concentrate knot by underflow
Crystallographic system is united.
Concentrate crystal system and desulfurization wastewater concentration systems independently are arranged using bypass type, it is ensured that concentrate crystallization and
Desulfurization wastewater is concentrated in safe operation under slave mode, and can repair and maintenance at any time；Client can flexible selective freezing as needed
Crystal salt is directly discharged into downstream deduster collection by salt independence collection system.
To sum up, the system does not need medicament sofening treatment；Investment cost, operating cost, operation energy consumption are relatively low；System operation
Highly stable, technological process is succinct, automaticity is high, is easy to operation maintenance；Technological adaptability is strong, disclosure satisfy that variation water quality
The big influence caused to system；The system is to utilize the flue of (low-level (stack-gas) economizer) between desulfurizing tower in residual heat from boiler fume
It is upper to set, therefore on low-level (stack-gas) economizer efficiency without influence.
Claims (4)
1. a kind of FGD wastewater zero discharge systems, it is adaptable to SCR system, including desulfurization wastewater concentration mechanism and thickened waste water crystallization
Mechanism, the high-concentration desulfurized waste water after concentration enters thickened waste water crystallization mechanism and carries out further crystallizing and drying, its feature
It is：Draw bypass connection thickened waste water crystallization mechanism on the flue of Benitration reactor high-temperature flue gas outlet to air preheater,
The desulfurization wastewater concentration mechanism mainly includes a concentration tower, and concentration tower is provided with gas approach, and the gas approach connects SCR pots
Gas bypass is evaporated concentration, the thickened waste water crystallization mechanism master to the desulfurization wastewater in concentration tower after furnace system air-introduced machine
To include a high temperature crystallization tower, high temperature crystallization tower connects a crystallization feed pump and introduces the concentration desulfurization wastewater in concentration tower
High temperature crystallization tower, high temperature crystallization tower is also provided with a gas approach, the high-temperature flue gas that the gas approach is introduced after Benitration reactor
Desulfurization wastewater after concentration is crystallized.
2. FGD wastewater zero discharge systems according to claim 1, it is characterised in that：Spraying layer is set in the concentration tower,
Concentration tower connects a circulating and evaporating pump and the desulfurization wastewater introducing spraying layer for entering concentration tower bottom is sprayed.
3. FGD wastewater zero discharge systems according to claim 2, it is characterised in that：The concentration tower is also connected with one and removed
Desulfurizing tower in day with fog, demister connection FGD systems.
4. FGD wastewater zero discharge systems according to claim 3, it is characterised in that：The outlet of thickened waste water crystallization mechanism
Flue is incorporated into the gas approach of steam generator system electrostatic or sack cleaner, and the flue gas after dedusting is passed through concentration tower.
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| CN201720103428.8U CN206580583U (en) | 2017-01-23 | 2017-01-23 | FGD wastewater zero discharge systems |
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| CN201720103428.8U CN206580583U (en) | 2017-01-23 | 2017-01-23 | FGD wastewater zero discharge systems |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587231A (en) * | 2017-01-23 | 2017-04-26 | 麦克罗特技术无锡有限公司 | FGD wastewater zero discharge system |
| CN108006683A (en) * | 2017-12-28 | 2018-05-08 | 华电郑州机械设计研究院有限公司 | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas |
| CN109879343A (en) * | 2019-03-25 | 2019-06-14 | 上海思九科技发展有限公司 | A kind of processing system and processing method of catalytic cracking and desulfurizing waste water |
| CN111233239A (en) * | 2020-02-17 | 2020-06-05 | 浙江天蓝环保技术股份有限公司 | Zero-discharge process and system for resource utilization of desulfurization wastewater |
| CN112142146A (en) * | 2019-06-27 | 2020-12-29 | 同方环境股份有限公司 | Concentration and evaporation system for zero discharge of power plant wastewater |
| CN112142143A (en) * | 2020-10-14 | 2020-12-29 | 南京依涛环保科技有限公司 | System and method for removing heavy metal and chloride ions in evaporative crystallization process of desulfurization wastewater |
| CN112279329A (en) * | 2020-11-23 | 2021-01-29 | 西安热工研究院有限公司 | Concentrated drying tower system of integration desulfurization waste water |
-
2017
- 2017-01-23 CN CN201720103428.8U patent/CN206580583U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587231A (en) * | 2017-01-23 | 2017-04-26 | 麦克罗特技术无锡有限公司 | FGD wastewater zero discharge system |
| CN108006683A (en) * | 2017-12-28 | 2018-05-08 | 华电郑州机械设计研究院有限公司 | A kind of method and apparatus that desulfurization wastewater zero-emission is realized using full flue gas |
| CN109879343A (en) * | 2019-03-25 | 2019-06-14 | 上海思九科技发展有限公司 | A kind of processing system and processing method of catalytic cracking and desulfurizing waste water |
| CN112142146A (en) * | 2019-06-27 | 2020-12-29 | 同方环境股份有限公司 | Concentration and evaporation system for zero discharge of power plant wastewater |
| CN111233239A (en) * | 2020-02-17 | 2020-06-05 | 浙江天蓝环保技术股份有限公司 | Zero-discharge process and system for resource utilization of desulfurization wastewater |
| CN112142143A (en) * | 2020-10-14 | 2020-12-29 | 南京依涛环保科技有限公司 | System and method for removing heavy metal and chloride ions in evaporative crystallization process of desulfurization wastewater |
| CN112279329A (en) * | 2020-11-23 | 2021-01-29 | 西安热工研究院有限公司 | Concentrated drying tower system of integration desulfurization waste water |
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