CN204434415U - Concentrating and treating system is softened in a kind of heat-engine plant desulfurized Wastewater by Electric dialysis - Google Patents
Concentrating and treating system is softened in a kind of heat-engine plant desulfurized Wastewater by Electric dialysis Download PDFInfo
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- CN204434415U CN204434415U CN201520042750.5U CN201520042750U CN204434415U CN 204434415 U CN204434415 U CN 204434415U CN 201520042750 U CN201520042750 U CN 201520042750U CN 204434415 U CN204434415 U CN 204434415U
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Abstract
The utility model discloses a kind of heat-engine plant desulfurized Wastewater by Electric dialysis and soften concentrating and treating system, comprise former pond, the first reaction tank, the second reaction tank, the first settler, the second settler, intermediate pool, electrodialysis unit, fresh-water pool, dense pond, soda ash storage tank, sodium hydroxide storage tank, coagulating agent storage tank, coagulant aids storage tank, chemicals dosing plant and evaporation and crystallization system.The utility model can realize the process to desulfurization wastewater, and simple to operate, and cost is low.
Description
Technical field
The utility model relates to a kind of concentrating and treating system, is specifically related to a kind of heat-engine plant desulfurized Wastewater by Electric dialysis and softens concentrating and treating system.
Background technology
At present, the desulfuration waste water treatment process that domestic and international thermal power plant is common is mainly: hydraulic(-ash) sluicing, arrange the methods such as chemical processing system (being mainly three header process), evaporation separately.Wherein evaporation process makes desulfurization wastewater be separated into water vapour and the solid waste of high-quality, so that realize full factory waste water zero discharge by evaporation and crystallization apparatus.The shortcoming adopting evaporative crystallisation process process desulfurization wastewater to exist is: invest very high, because whole desulfurization wastewater all evaporates, working cost is very high.Therefore, need to carry out decrement treatment to desulfurization wastewater, reduce the processing cost of evaporation and crystallization system.
Technique for desulfurization wastewater decrement treatment mainly comprises reverse osmosis and nanofiltration etc.Because desulfurization wastewater saltiness is higher, and be rich in organism and fouling tendency material, adopt reverse osmosis to carry out concentrated decrement, pretreatment technology requires strict, and the control of system recoveries rate is on the low side, generally about 50%.Adopt nanofiltration to carry out desulfurization wastewater decrement treatment, the clearance of nanofiltration to monovalent ion is bigger than normal, and producing water cannot direct reuse, and need to produce the further desalination of water to nanofiltration and just can reach reuse requirement, technical process is partially long, and processing cost is higher.Therefore, need to explore suitable desulfurization wastewater deweighting treating technology.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, and provide a kind of heat-engine plant desulfurized Wastewater by Electric dialysis and soften concentrating and treating system, this system can realize the process to desulfurization wastewater, and simple to operate, and cost is low.
For achieving the above object, heat-engine plant desulfurized Wastewater by Electric dialysis described in the utility model is softened concentrating and treating system and is comprised former pond, the first reaction tank, the second reaction tank, the first settler, the second settler, intermediate pool, electrodialysis unit, fresh-water pool, dense pond, soda ash storage tank, sodium hydroxide storage tank, coagulating agent storage tank, coagulant aids storage tank, chemicals dosing plant and evaporation and crystallization system;
The entrance of described first reaction tank is connected with the outlet of the outlet in former pond and sodium hydroxide storage tank, the outlet of the outlet of the first reaction tank and the outlet of coagulating agent storage tank and coagulant aids storage tank by pipeline and the entrance of Guan Houyu first settler be connected, the outlet at the first settler top and the outlet of soda ash storage tank are connected with the entrance of the second reaction tank, the outlet of the second reaction tank is connected with the entrance of the second settler, the outlet at the second settler top is connected with the entrance of intermediate pool, the outlet of intermediate pool and the outlet of chemicals dosing plant by pipeline and the entrance of Guan Houyu electrodialysis unit be connected, the dense water out of electrodialysis unit is connected with the entrance in dense pond, the water outlet of electrodialysis unit is connected with the entrance of fresh-water pool, the outlet in dense pond is connected with the entrance of evaporation and crystallization system.
Also comprise pressure filter, go the entrance of pressure filter to be connected with the sludge outlet of the first bottom of clarifier and the sludge outlet of the second bottom of clarifier.
Described chemicals dosing plant is built with hydrochloric acid.
The utility model has following beneficial effect:
Heat-engine plant desulfurized Wastewater by Electric dialysis described in the utility model softens concentrating and treating system when processing heat-engine plant desulfurized waste water, first will be regulated the pH value of desulfurization wastewater by sodium hydroxide, carry out coagulating sedimentation by the coagulant aids in the coagulating agent in coagulating agent storage tank and coagulant aids storage tank again, make Mg
2+and part heavy metal ion deposits, then add the soda ash of soda ash storage tank output, make the Ca in desulfurization wastewater
2+and residual gravity metal ion precipitates, then adjust ph, and being separated into fresh water and condensed water after carrying out electrodialysis by electrodialysis unit, condensed water reclaims after evaporation and crystallization system evaporative crystallization, and fresh water directly reclaims, thus the process realized desulfurization wastewater, effectively can reduce the wastewater flow rate of evaporated crystallization device process simultaneously, can also Industrial Salt be recycled, greatly reduce energy consumption, effectively can solve desulfurization wastewater recycle problem, can Technique for Zero Discharge of Waste Water in Thermal Power Plants be realized.And technological design is simple, system run all right, can realize fully automatic operation, and operation runs simple and convenient, and cost is low.
Further, the utility model also comprises pressure filter, go the entrance of pressure filter to be connected with the sludge outlet of the first bottom of clarifier and the sludge outlet of the second bottom of clarifier, the mud of the first settler and the second bottom of clarifier reclaims through removing pressure filter, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1 be coagulating agent storage tank for former pond, 2 is the first reaction tank, 3 for sodium hydroxide storage tank, 4 is the first settler, 5,6 be intermediate pool for coagulant aids storage tank, 7 is the second reaction tank, 8 for soda ash storage tank, 9 is the second settler, 10,11 be electrodialysis unit, 12 be chemicals dosing plant, 13 be dense pond, 14 be fresh-water pool, 15 for going pressure filter, 16 for evaporation and crystallization system.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to figure 1, heat-engine plant desulfurized Wastewater by Electric dialysis described in the utility model is softened concentrating and treating system and is comprised former pond 1, first reaction tank 2, second reaction tank 7, first settler 4, second settler 9, intermediate pool 10, electrodialysis unit 11, fresh-water pool 14, dense pond 13, soda ash storage tank 8, sodium hydroxide storage tank 3, coagulating agent storage tank 5, coagulant aids storage tank 6, chemicals dosing plant 12 and evaporation and crystallization system 16;
The entrance of described first reaction tank 2 is connected with the outlet in former pond 1 and the outlet of sodium hydroxide storage tank 3, the outlet of the outlet of the first reaction tank 2 and the outlet of coagulating agent storage tank 5 and coagulant aids storage tank 6 by pipeline and the entrance of Guan Houyu first settler 4 be connected, the outlet at the first settler 4 top and the outlet of soda ash storage tank 8 are connected with the entrance of the second reaction tank 7, the outlet of the second reaction tank 7 is connected with the entrance of the second settler 9, the outlet at the second settler 9 top is connected with the entrance of intermediate pool 10, the outlet of intermediate pool 10 and the outlet of chemicals dosing plant 12 by pipeline and the entrance of Guan Houyu electrodialysis unit 11 be connected, the dense water out of electrodialysis unit 11 is connected with the entrance in dense pond 13, the water outlet of electrodialysis unit 11 is connected with the entrance of fresh-water pool 14, the outlet in dense pond 13 is connected with the entrance of evaporation and crystallization system 16.
The utility model also comprises pressure filter 15, goes the entrance of pressure filter 15 to be connected with the sludge outlet bottom the first settler 4 and the sludge outlet bottom the second settler 9; Chemicals dosing plant 12 is built with hydrochloric acid.
Concrete steps of the present utility model are:
1) desulfurization wastewater that thermal power plant produces enters in former pond 1, desulfurization wastewater in former pond 1 enters into the first reaction tank 2, sodium hydroxide simultaneously in sodium hydroxide storage tank 3 enters in the first reaction tank 2, makes the pH value of desulfurization wastewater in the first reaction tank 2 be adjusted to 10-11; Be input in the first settler 4 after coagulant aids in the coagulating agent that desulfurization wastewater and coagulating agent storage tank 5 after the first reaction tank 2 processes export and coagulant aids storage tank 6 mixes, and at the first settler 4 coagulating sedimentation, and then Mg in removal desulfurization wastewater
2+and part heavy metal ion;
2) desulfurization wastewater after the first settler 4 processes enters into the second reaction tank 7, and reacts in the second reaction tank 7 with the soda ash that soda ash storage tank 8 exports, and makes the Ca in desulfurization wastewater
2+generate CaCO
3, and remove remaining heavy metal ion, the desulfurization wastewater simultaneously after the second reaction tank 7 processes enters into the second settler 9, and precipitates in the second settler 9, and the desulfurization wastewater through precipitation in the second settler 9 enters into intermediate pool 10; It should be noted that, the organism entering into the water of intermediate pool 10 accounts for the organic 30-40% of original desulfurization wastewater, ensures the steady running of follow-up system.
3) after the desulfurization wastewater in intermediate pool 10 mixes with the medicine exported in chemicals dosing plant 12, the pH value of desulfurization wastewater is made to be adjusted to 9-10, then electrodialysis unit 11 is entered into, and be separated into fresh water and condensed water through electrodialysis unit 11, wherein fresh water enters into fresh-water pool 14 and recycles, and condensed water is through evaporation and crystallization system 16 evaporative crystallization and reclaim.
Enter into the desulfurization wastewater Ca of the second reaction tank 7
2+molar mass be 1: 1 with the ratio of the molar mass that enters into the second reaction tank 7 soda ash.
The voltage of supply of electrodialysis unit 11 controls to determine according to the sum of series hop count of electrodialysis unit 11, and ratio of desalinization controls 70%, and the rate of recovery controls 60% ~ 80%, and service temperature controls at 20 DEG C ~ 30 DEG C.Electrodialysis water outlet is divided into fresh water and dense water, and fresh water enters fresh-water pool 14, can direct reuse, and the main sodium chloride-containing of dense water, macromolecular substance, enter dense pond 13, carry out evaporative crystallization.In addition, by adjusting the amount of coagulating agent and coagulant aids, Mg in the water that the first settler 4 exports
2+concentration < 20mg/L; By controlling the addition of soda ash, be Ca in the water of the second settler 9 output
2+concentration < 20mg/L.
Claims (3)
1. concentrating and treating system is softened in a heat-engine plant desulfurized Wastewater by Electric dialysis, it is characterized in that, comprise former pond (1), the first reaction tank (2), the second reaction tank (7), the first settler (4), the second settler (9), intermediate pool (10), electrodialysis unit (11), fresh-water pool (14), dense pond (13), soda ash storage tank (8), sodium hydroxide storage tank (3), coagulating agent storage tank (5), coagulant aids storage tank (6), chemicals dosing plant (12) and evaporation and crystallization system (16);
The entrance of described first reaction tank (2) is connected with the outlet of the outlet of former pond (1) and sodium hydroxide storage tank (3), the outlet of the outlet of the first reaction tank (2) and the outlet of coagulating agent storage tank (5) and coagulant aids storage tank (6) by pipeline and the entrance of Guan Houyu first settler (4) be connected, the outlet at the first settler (4) top and the outlet of soda ash storage tank (8) are connected with the entrance of the second reaction tank (7), the outlet of the second reaction tank (7) is connected with the entrance of the second settler (9), the outlet at the second settler (9) top is connected with the entrance of intermediate pool (10), the outlet of intermediate pool (10) and the outlet of chemicals dosing plant (12) by pipeline and the entrance of Guan Houyu electrodialysis unit (11) be connected, the dense water out of electrodialysis unit (11) is connected with the entrance of dense pond (13), the water outlet of electrodialysis unit (11) is connected with the entrance of fresh-water pool (14), the outlet in dense pond (13) is connected with the entrance of evaporation and crystallization system (16).
2. concentrating and treating system is softened in heat-engine plant desulfurized Wastewater by Electric dialysis according to claim 1, it is characterized in that, also comprise pressure filter (15), go the entrance of pressure filter (15) to be connected with the sludge outlet of the first settler (4) bottom and the sludge outlet of the second settler (9) bottom.
3. concentrating and treating system is softened in heat-engine plant desulfurized Wastewater by Electric dialysis according to claim 1, and it is characterized in that, described chemicals dosing plant (12) is built with hydrochloric acid.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671572A (en) * | 2015-01-21 | 2015-06-03 | 西安西热水务环保有限公司 | Electrodialysis softening and concentrating treatment system and method for desulfurization wastewater from thermal power plant |
| CN105060545A (en) * | 2015-07-17 | 2015-11-18 | 西安西热水务环保有限公司 | System and method for softening treatment of desulfurization wastewater of coal-fired power plant |
| CN105461136A (en) * | 2015-12-09 | 2016-04-06 | 西安西热水务环保有限公司 | System and method for comprehensive treatment of wastewater of thermal power plant and recovery of chemical resources |
| CN106517569A (en) * | 2016-05-17 | 2017-03-22 | 山东百川集大环境工程有限公司 | Zero discharge treatment process for desulfurization wastewater |
-
2015
- 2015-01-21 CN CN201520042750.5U patent/CN204434415U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671572A (en) * | 2015-01-21 | 2015-06-03 | 西安西热水务环保有限公司 | Electrodialysis softening and concentrating treatment system and method for desulfurization wastewater from thermal power plant |
| CN105060545A (en) * | 2015-07-17 | 2015-11-18 | 西安西热水务环保有限公司 | System and method for softening treatment of desulfurization wastewater of coal-fired power plant |
| CN105060545B (en) * | 2015-07-17 | 2017-12-05 | 西安西热水务环保有限公司 | A kind of system and method for sofening treatment Desulphurization for Coal-fired Power Plant waste water |
| CN105461136A (en) * | 2015-12-09 | 2016-04-06 | 西安西热水务环保有限公司 | System and method for comprehensive treatment of wastewater of thermal power plant and recovery of chemical resources |
| CN105461136B (en) * | 2015-12-09 | 2017-11-14 | 西安西热水务环保有限公司 | A kind of waste water of heat-engine plant integrated treatment and chemical resource recovery system and method |
| CN106517569A (en) * | 2016-05-17 | 2017-03-22 | 山东百川集大环境工程有限公司 | Zero discharge treatment process for desulfurization wastewater |
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