CN209974506U - Wet flue gas desulfurization waste water concentration decrement system - Google Patents
Wet flue gas desulfurization waste water concentration decrement system Download PDFInfo
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- CN209974506U CN209974506U CN201822207993.6U CN201822207993U CN209974506U CN 209974506 U CN209974506 U CN 209974506U CN 201822207993 U CN201822207993 U CN 201822207993U CN 209974506 U CN209974506 U CN 209974506U
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Abstract
The utility model provides a pair of concentrated decrement system of wet flue gas desulfurization waste water, this system mainly include dust remover, flue, draught fan, desulfurizing tower, three headers, depositing reservoir, concentrated pond, waste water delivery pump that connect gradually. After the desulfurization wastewater is subjected to primary treatment by the triple box and the clarification tank, supernatant is discharged to the concentration tank by the wastewater delivery pump, the desulfurization wastewater forms circulation in the concentration tank, the desulfurization wastewater is pumped to a spray layer at the upper part of the concentration tank by a wastewater circulating pump, formed fog drops are mixed with rising high-temperature flue gas, part of the desulfurization wastewater is evaporated into steam, and the steam is demisted at the top and then is merged into a main flue to enter a desulfurization system for treatment and can be used as desulfurization water supplement; and the concentrated desulfurization wastewater enters a wastewater zero discharge system, and the bottom sludge enters a sludge treatment system. The system utilizes the high-temperature original flue gas after dust removal to evaporate part of the desulfurization wastewater into steam, effectively utilizes the existing waste heat resources to carry out wastewater concentration and reduction, and realizes the concentration and reduction of the desulfurization wastewater; meanwhile, the concentrated desulfurization wastewater is sent into a wastewater zero discharge system, so that the stability of equipment of the zero discharge system is improved, and the energy conservation and consumption reduction of the whole system are realized.
Description
Technical Field
The utility model relates to a wet flue gas desulfurization technical field, in particular to wet flue gas desulfurization waste water concentration decrement system.
Background
Along with the increasingly strict national energy-saving and environment-friendly policies, particularly the release and implementation of 'ten items of water', the nation strengthens the treatment of various water pollutions, provides a strict source protection and ecological restoration system, comprehensively controls pollutant discharge, makes an effort to protect water resources and fully ensures the safety of the water ecological environment. The national treatment of environmental pollution is increasingly accelerated, and the requirement for the discharge of waste water is also increasingly strict. The problems of water saving and emission reduction of coal-fired power plants are increasingly emphasized, and particularly, zero emission of wet desulphurization wastewater is difficult to realize due to factors such as high salt content, high corrosivity, complex components, difficult recycling and the like.
The wet desulfurization wastewater mainly has three sources: wastewater produced by a boiler make-up water treatment system; circulating water and high salt water produced by a cooling water system; wastewater from the desulfurization system itself and wastewater from other systems. At present, the desulfurization wastewater treatment process which is most widely applied in coal-fired power plants is a triple box process. The process adopts a physical and chemical method, and comprises neutralization, sedimentation, flocculation, clarification and the like to treat the desulfurization wastewater. However, Cl in the desulfurization wastewater treated by the triple box－The concentration is not reduced, and the waste water cannot be recycled or directly discharged due to strong corrosivity. In addition, the wastewater treatment process also comprises an evaporative crystallization technology, a membrane treatment technology and the like, the two processes need pretreatment before wastewater treatment, the early investment and operation maintenance cost is high, common enterprises are difficult to bear, complete evaporation of the desulfurization wastewater cannot be guaranteed, serious dust deposition of a flue can be caused, long-term stable operation cannot be realized, and the stability of a unit is influenced.
In order to solve the technical problem, the utility model provides a desulfurization waste water concentration decrement system, the system utilizes the former flue gas of high temperature after the dust removal to evaporate partial desulfurization waste water into vapor, utilizes current waste heat resource to carry out waste water concentration decrement effectively, realizes the concentration decrement of desulfurization waste water; meanwhile, the concentrated desulfurization wastewater is sent into a wastewater zero discharge system, so that the stability of equipment of the zero discharge system is improved, and the energy conservation and consumption reduction of the whole system are realized.
Disclosure of Invention
The to-be-solved technical problem of the utility model is on energy saving and consumption reduction's basis, provide a concentrated decrement system of wet flue gas desulfurization waste water, it sets up on the bypass flue between dust remover and desulfurizing tower, its characterized in that: including the three headers, depositing reservoir, the concentrated pond that connect gradually, wherein: the triple box is connected with the desulfurizing tower and is used for pretreating the desulfurization wastewater, and the triple box comprises a neutralization unit, a sedimentation unit and a flocculation unit; the clarification tank is used for carrying out simple physical precipitation on the wastewater treated by the three headers, discharging supernatant to the concentration tank and discharging underflow to a sludge treatment system; the concentration tank is connected to the bypass flue and is used for concentrating wastewater; the concentration tank comprises a demisting layer, a spraying layer, a smoke distributing layer and a waste water collecting region from top to bottom.
The dust remover is one or a plurality of combinations of an electric dust remover, a bag-type dust remover, a wet-type electric dust remover and a cyclone dust remover. And an induced draft fan and a bypass flue are arranged behind the dust remover and used for leading out a part of flue gas and sending the part of flue gas into the concentration tank. The desulfurizing tower is a wet desulfurizing tower.
And the bypass flue is provided with a first fan and is used for feeding the raw flue gas into a concentration tank to concentrate the desulfurization wastewater.
And a wastewater delivery pump is arranged between the clarification tank and the concentration tank and is used for delivering the supernatant of the clarification tank to the concentration tank.
And a wastewater circulating pump is arranged outside the concentration tank and used for conveying the desulfurization wastewater at the lower part of the concentration tank to the spraying layer.
The utility model discloses a following flow realizes: after the original flue gas passes through a dust remover induced draft fan, one path of flue gas is induced from a main flue and enters a concentration tank through a first fan; after the wastewater generated by the wet desulphurization process is subjected to primary treatment by a triple box and a clarification tank, supernatant is discharged to a concentration tank by a wastewater delivery pump, the desulphurization wastewater forms circulation in the concentration tank, the desulphurization wastewater is pumped to a spray layer at the upper part of the concentration tank by a wastewater circulating pump, formed fog drops are mixed with rising high-temperature flue gas, part of the desulphurization wastewater is evaporated into steam, demisted at the top part of the desulphurization wastewater is merged into a main flue, and the steam enters a desulphurization system for treatment and can be used as desulphurization water supplement; and the concentrated desulfurization wastewater enters a wastewater zero discharge system, and the bottom sludge subjected to primary treatment by the triple box and the clarifier enters a sludge treatment system.
The utility model has the advantages that:
the utility model discloses a wet flue gas desulfurization waste water concentration decrement system, mainly in the wet flue gas desulfurization system, utilize the former flue gas of high temperature after the dust removal to evaporate partial desulfurization waste water into vapor, utilize the existing waste heat resource to carry out the concentrated decrement of waste water effectively, realize the concentrated decrement of desulfurization waste water; meanwhile, the concentrated desulfurization wastewater is sent into a wastewater zero discharge system, so that the stability of equipment of the zero discharge system is improved, and the energy conservation and consumption reduction of the whole system are realized.
Drawings
Figure 1 is a schematic diagram of the system of the present invention,
figure 2 is a schematic structural diagram of the concentration tank of the utility model,
fig. 3 is a schematic structural view of the triple box and the clarification tank of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the technical problems, technical solutions and advantages of the present invention more clear, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model provides a concentrated decrement system of wet flue gas desulfurization waste water, including setting up dust pelletizing system 3 before the draught fan, link to each other with the former flue 1 of entry to the desulfurizing tower 7 that clean flue 2 and chimney 8 link to each other for desulfurization waste water preliminary treatment's triplex case 9 and depositing reservoir 10, a waste water delivery pump 11 for carrying waste water, a concentrated pond 12 for the concentrated decrement of waste water, a fan 5 for carrying former flue gas.
The raw flue gas passes through a dust remover 3 in a raw flue 1, then passes through a draught fan 4 and then is sent into a desulfurizing tower 7 through a main flue, and the purified flue gas after desulfurization is discharged through a chimney 8. A bypass flue is arranged behind the draught fan 4, a part of flue gas is led out, and the flue gas is sent into the concentration tank 12 through the first draught fan 5 to concentrate the desulfurization wastewater.
Desulfurization waste water formed by a desulfurizing tower 7 enters a triple box 9 and a clarification tank 10, after preliminary liquid-solid separation is carried out, bottom flow is discharged to a sludge treatment system 13, supernatant is sent into a concentration tank 12 through a waste water delivery pump 11, waste water forms circulation in the concentration tank, the waste water is sprayed to a spraying layer on the upper part of the concentration tank through a waste water circulating pump 6, formed fog drops are mixed with rising high-temperature raw smoke, partial desulfurization waste water is evaporated into steam, the steam is demisted on the top part and then is merged into a main flue, and the flue enters a desulfurization system for treatment and can be used as desulfurization water supplement. The concentrated desulfurization wastewater is discharged to a wastewater zero discharge system 14.
The operation of the present invention is described in detail below:
(1) flue gas dust removal: dedusting original flue gas of the boiler by a deduster;
(2) and (3) concentrating wastewater: after the original flue gas passes through an induced draft fan, one path of flue gas is induced from a main flue and is discharged to a concentration tank through the induced draft fan; after the desulfurization wastewater is subjected to preliminary solid-liquid separation by a triple box and a clarifier, supernatant is discharged to a concentration tank by a wastewater delivery pump, the desulfurization wastewater forms circulation in the concentration tank, the desulfurization wastewater is pumped to a spray layer at the upper part of the concentration tank by a wastewater circulating pump, formed fog drops are mixed with rising high-temperature raw flue gas, part of the desulfurization wastewater is evaporated into steam, demisted at the top part of the desulfurization wastewater is merged into a main flue, and the steam enters a desulfurization system for treatment;
(3) and (3) reducing wastewater: the desulfurization wastewater forms circulation inside the concentration tank, the concentrated desulfurization wastewater enters a wastewater zero discharge system, and the underflow is discharged into a sludge treatment system.
The structure of the triple box and the clarification tank is shown in figure 3, and the triple box is used for pretreatment of desulfurization wastewater and comprises a neutralization unit, a sedimentation unit and a flocculation unit. The neutralization unit is mainly used for adjusting the pH value of the wastewater to be alkaline by adding lime milk; in order to precipitate heavy metal, a heavy metal chelating agent such as organic sulfur is added into a settling unit; in the flocculation unit, in order to remove most suspended matters in water, a flocculating agent such as polyferric chloride sulfate and a coagulant aid such as polyacrylamide are added, so that the suspended matters and colloids in the wastewater are subjected to flocculation and net catching, and then large flocs are formed to facilitate precipitation.
The wastewater treated by the triple box is subjected to simple physical precipitation in a clarification tank. And wastewater from the triple box flows from bottom to top in the clarification tank, supernatant is collected at the upper part of the clarification tank and is discharged to the concentration tank through a wastewater conveying pump, suspended matters are separated from the supernatant and are deposited at the bottom of the clarification tank to be conveyed to a sludge treatment system.
The concentration tank is the main equipment of the system, and as shown in fig. 2, the concentration tank is sequentially provided with a demisting layer 17, a spraying layer 18, a flue gas uniform distribution layer 19 and a wastewater collecting region 20 from top to bottom. The demisting layer is mainly used for separating liquid drops carried by gas at the top of the concentration tank, so that the effective mass transfer efficiency of gas and liquid is ensured; the flue gas uniform cloth layer is mainly used for enabling ascending flue gas to be uniformly distributed and enabling the mass transfer efficiency with spraying wastewater to be higher; the concentration of the wastewater is mainly completed in a spraying layer, the desulfurization wastewater is pumped to the spraying layer 18 through a wastewater circulating pump 6, formed fog drops are mixed with high-temperature raw flue gas from a flue gas inlet 15 at the upper part of a concentration tank, part of the desulfurization wastewater is evaporated into steam, demisted at the top part and then merged into a main flue through a flue gas outlet 16 to enter a desulfurization system for treatment, wherein a nozzle is made of silicon carbide; the waste water collecting area is arranged at the bottom of the concentration tank, and a waste water circulating pump is arranged at the same time to pump waste water to the spraying layer.
The utility model discloses a wet flue gas desulfurization waste water concentration decrement system, mainly in the wet flue gas desulfurization system, utilize the former flue gas of high temperature after the dust removal to evaporate partial desulfurization waste water into vapor, utilize the existing waste heat resource to carry out the concentrated decrement of waste water effectively, realize the concentrated decrement of desulfurization waste water; meanwhile, the concentrated desulfurization wastewater is sent into a wastewater zero discharge system, so that the stability of equipment of the zero discharge system is improved, and the energy conservation and consumption reduction of the whole system are realized.
Although the embodiments of the present invention have been described, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the principle of the present invention, and these modifications and variations should be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a concentrated decrement system of wet flue gas desulfurization waste water, sets up on the bypass flue between dust remover and desulfurizing tower which characterized in that: including the three headers, depositing reservoir, the concentrated pond that connect gradually, wherein:
the triple box is used for pretreatment of desulfurization wastewater and comprises a neutralization unit, a sedimentation unit and a flocculation unit;
the clarification tank is used for simply and physically precipitating the wastewater treated by the three headers, discharging supernatant to the concentration tank and discharging underflow to a sludge treatment system;
the concentration tank is connected to the bypass flue and is used for concentrating wastewater; the concentration tank comprises a demisting layer, a spraying layer, a smoke distributing layer and a waste water collecting region from top to bottom.
2. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: still including set up in draught fan behind the dust remover, be provided with behind the draught fan bypass flue for draw forth partly flue gas and send it into the concentration tank.
3. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: still including set up in waste water delivery pump between depositing reservoir and the concentration tank, waste water delivery pump is used for with the supernatant of depositing reservoir is carried to the concentration tank.
4. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: the desulfurization waste water treatment device further comprises a first fan arranged on the bypass flue, wherein the first fan is used for sending the original flue gas into a concentration tank to concentrate desulfurization waste water.
5. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: the desulfurization device also comprises a wastewater circulating pump arranged outside the concentration tank and used for conveying desulfurization wastewater at the lower part of the concentration tank to the spraying layer.
6. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: the dust remover is one or a plurality of combinations of an electric dust remover, a bag-type dust remover, a wet-type electric dust remover and a cyclone dust remover.
7. The system for concentrating and reducing wet desulfurization waste water according to claim 1, wherein: the desulfurizing tower is a wet desulfurizing tower.
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| CN201822207993.6U CN209974506U (en) | 2018-12-27 | 2018-12-27 | Wet flue gas desulfurization waste water concentration decrement system |
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| CN201822207993.6U CN209974506U (en) | 2018-12-27 | 2018-12-27 | Wet flue gas desulfurization waste water concentration decrement system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111252838A (en) * | 2020-03-30 | 2020-06-09 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater flue concentration treatment device and method |
| CN111252837A (en) * | 2020-03-30 | 2020-06-09 | 大唐环境产业集团股份有限公司 | Concentrated flue of desulfurization waste water and processing apparatus |
| CN111320319A (en) * | 2020-03-30 | 2020-06-23 | 大唐环境产业集团股份有限公司 | High salt waste water cryoconcentration processing apparatus |
| CN111908696A (en) * | 2020-08-24 | 2020-11-10 | 西安热工研究院有限公司 | Zero-discharge system and method for flue gas and water co-treatment of desulfurization wastewater |
| CN112194318A (en) * | 2020-09-28 | 2021-01-08 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Flue gas waste heat concentration method and device for desulfurization wastewater |
| CN112499652A (en) * | 2020-10-30 | 2021-03-16 | 南京工业大学 | System and method for zero discharge of magnesium oxide desulfurization wastewater |
| CN113429047A (en) * | 2021-06-11 | 2021-09-24 | 江苏民生重工有限公司 | Wet desulphurization system and desulphurization wastewater treatment device thereof |
| CN116813010A (en) * | 2023-08-30 | 2023-09-29 | 上海鲁源控制设备有限公司 | Low temperature flue gas waste heat desulfurization waste water treatment equipment |
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2018
- 2018-12-27 CN CN201822207993.6U patent/CN209974506U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111252838A (en) * | 2020-03-30 | 2020-06-09 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater flue concentration treatment device and method |
| CN111252837A (en) * | 2020-03-30 | 2020-06-09 | 大唐环境产业集团股份有限公司 | Concentrated flue of desulfurization waste water and processing apparatus |
| CN111320319A (en) * | 2020-03-30 | 2020-06-23 | 大唐环境产业集团股份有限公司 | High salt waste water cryoconcentration processing apparatus |
| CN111908696A (en) * | 2020-08-24 | 2020-11-10 | 西安热工研究院有限公司 | Zero-discharge system and method for flue gas and water co-treatment of desulfurization wastewater |
| CN112194318A (en) * | 2020-09-28 | 2021-01-08 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Flue gas waste heat concentration method and device for desulfurization wastewater |
| CN112499652A (en) * | 2020-10-30 | 2021-03-16 | 南京工业大学 | System and method for zero discharge of magnesium oxide desulfurization wastewater |
| CN113429047A (en) * | 2021-06-11 | 2021-09-24 | 江苏民生重工有限公司 | Wet desulphurization system and desulphurization wastewater treatment device thereof |
| CN116813010A (en) * | 2023-08-30 | 2023-09-29 | 上海鲁源控制设备有限公司 | Low temperature flue gas waste heat desulfurization waste water treatment equipment |
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