CN211367231U - Desulfurization wastewater treatment device - Google Patents

Abstract

The utility model discloses a desulfurization effluent treatment plant, including precipitator (1), the upper portion and the waste water reaction box (2) of precipitator (1) are linked together, the bottom and desulfurization absorption tower (11) of precipitator (1) are linked together, and the lower part and clarifier (3) of waste water reaction box (2) are linked together, the upper portion and the top of precision filter (4) of clarifier (3) are linked together, the lower part and the top of clear water tank (5) of precision filter (4) are linked together. The device is more closely connected with a desulfurization system, and is not completely independent of the desulfurization system unlike the device in the traditional triple-box process, passively receives desulfurization wastewater and cannot adjust the water quantity.

Description

Desulfurization wastewater treatment device

Technical Field

The utility model relates to a waste water treatment technical field especially relates to a desulfurization effluent treatment plant.

Background

The treatment of coal-fired unit desulfurization wastewater for flue gas desulfurization by limestone-gypsum wet process technology has been a difficult problem. The traditional desulfurization wastewater treatment device adopts a 'triple box' process and discharges after reaching the standard. However, the system is complex and requires the addition of a wide variety of water treatment agents to achieve the desired results. However, the desulfurization system is a frequently-changed system, so that the water quality of the discharged desulfurization wastewater varies greatly, the traditional process cannot achieve ideal effects, and the operation cost is high.

At present, practice proves that after a desulfurization system of a coal-fired power plant is transformed through ultra-clean discharge, the particle size of gypsum is reduced, flocculation and precipitation of the traditional triple box process are not facilitated, and the effluent of the triple box is not up to standard or even cannot be treated. Many projects often ignore the influence of gypsum particle size when treating desulfurization waste water under such working conditions, and the problem can be solved by increasing the medicament, but in fact, the method increases the operation cost and has little help on the treatment effect.

Therefore, it is necessary to develop a new desulfurization wastewater treatment apparatus.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a desulfurization effluent treatment plant, fungible traditional triplex case desulfurization effluent treatment system.

In order to achieve the above object, the utility model discloses a technical scheme specifically as follows:

the utility model provides a desulfurization waste water treatment device, includes the precipitator, the upper portion and the waste water reaction tank of precipitator communicate with each other, the bottom and the desulfurization absorption tower of precipitator are linked together, and the lower part and the clarifier of waste water reaction tank are linked together, the upper portion and the top of precision filter of clarifier are linked together, the lower part and the top of clear water tank of precision filter are linked together.

Wherein, the precipitator is communicated with the desulfurization absorption tower through a precipitator underflow pump.

Wherein, the top of the wastewater reaction box is provided with a dosing device.

Wherein, the lower part of the wastewater reaction tank is communicated with the clarifier through a wastewater delivery pump.

The bottom of the clarifier is connected with the dehydrator through a clarifier underflow pump.

Wherein, the top of the clear water tank is provided with a medicine adding port capable of adjusting pH.

The lower part of the clean water tank is connected with a clean water discharge pipeline through a clean water pump.

Compared with the prior art, the utility model discloses an outstanding effect lies in:

(1) the device is more closely connected with a desulfurization system, and is not completely independent of the desulfurization system unlike the device in the traditional triple-box process, passively receives desulfurization wastewater and cannot adjust the water quantity.

(2) By adopting the device, the emission standard requirement can be met only by adding one medicament, namely the DL/T997-2006 Water quality control index of limestone-gypsum wet desulphurization wastewater of thermal power plant is met, and the treatment effect is superior to that of the traditional process. The device can also be arranged in the open air.

(3) As the traditional three-way box has a plurality of types of dosing, the traditional three-way box mainly comprises lime milk solution, organic sulfur solution, flocculating agent, coagulant, bactericide and the like. In order to achieve the desired effect, it takes a long time to search for the amount of each drug to be administered during driving, and sometimes even one or two months of searching does not achieve the desired treatment effect. And the control of the adding systems of various medicaments is complex, and the best effect of each medicament is difficult to be exerted, so that the effluent quality is not ensured. When the working condition that the water quality fluctuates severely is met, the problem of the traditional triple box process is possibly caused, the water quality of effluent cannot be ensured, the chemical adding amount is large, and the operation cost is high.

The device only selects one solid water treatment agent, and the agent is specially compounded by aiming at the desulfurization wastewater through a plurality of agents according to engineering experience, and can adapt to complex water quality fluctuation. The medicament used in the device contains natural mineral materials with extremely strong adsorption capacity and heavy metal trapping medicaments, has the remarkable capability of removing harmful substances in desulfurization wastewater such as COD, phosphorus, SS, nitrite nitrogen, heavy metals and the like, has a good flocculation and sedimentation effect, and is easy to realize water quality control during process fluctuation. When the concentration of suspended matters in the wastewater is increased, the problem can be solved well only by properly increasing the dosage of the medicament. The addition amount of the desulfurization wastewater is 1-3 per mill, and the addition amount of the agent is equal to that of a flocculating agent in the traditional triple box addition agent, and other agents do not need to be added, so that the operation cost of the agent is greatly saved.

(4) Traditional trigeminy case equipment is that an equipment is constituteed to three continuous box, mostly is the rectangle, sets up the agitator on every box. And because only one comprehensive medicament is added into the device, only one wastewater reaction box is arranged, the wastewater reaction box is designed into a flow field optimized by a tank body during wastewater stirring, so that the wastewater and the medicament can be more quickly and sufficiently reacted, and the retention time of the wastewater in the reaction box is about 30 min. The spiral metering device for adding the comprehensive medicament is arranged on the reaction box, and the medicament is directly added in dry powder, so that the industrial water for dissolving the medicament is saved. The metering device is designed in a variable frequency mode, and proper adding amount is selected according to different flow rates or concentrations of the wastewater.

(5) The residence time of the clarifier in the traditional triple-header process is generally designed to be more than 4 hours, and the residence time of the clarifier can be reduced to 2 hours due to the addition of efficient water treatment agents and the reasonable process flow design, so that the occupied area of equipment and the investment cost of the equipment are reduced.

(6) This device has reduced the output of mud: in the traditional triple-header process, sludge discharged from a clarifier is only generated in the clarifier and is conveyed to dewatering equipment for dewatering through a sludge pump. And this device has remained the nature of the suspended solid in the raw water owing to the precipitator has been set up to the front end to do not add the medicine, can directly return the absorption tower and participate in the desulfurization, tiny suspended particle participates in the desulfurization as the seed crystal of absorption tower promptly. The setting of the precipitator can reduce 30-50% of sludge, thereby reducing the sludge yield of the rear-end clarifier, namely reducing the solid waste production.

The desulfurization waste water treatment apparatus of the present invention will be further described with reference to the accompanying drawings and specific examples.

Drawings

FIG. 1 is a schematic structural view of the desulfurization wastewater treatment device of the present invention.

The method comprises the following steps of 1-a precipitator, 2-a wastewater reaction box, 3-a clarifier, 4-a precision filter, 5-a clear water tank, 6-a precipitator underflow pump, 7-a wastewater delivery pump, 8-a clarifier underflow pump, 9-a clear water pump, 10-a dosing device, 11-a desulfurization absorption tower and 12-a dehydrator.

Detailed Description

As shown in fig. 1, the desulfurization wastewater treatment device comprises a precipitator 1, wherein the upper part of the precipitator 1 is communicated with a wastewater reaction tank 2, the bottom of the precipitator 1 is communicated with a desulfurization absorption tower 11, the lower part of the wastewater reaction tank 2 is communicated with a clarifier 3, the upper part of the clarifier 3 is communicated with the top of a precision filter 4, and the lower part of the precision filter 4 is communicated with the top of a clean water tank 5.

The precipitator 1 is communicated with a desulfurization absorption tower 11 through a precipitator underflow pump 6.

The top of the wastewater reaction box 2 is provided with a dosing device 10. The lower part of the wastewater reaction tank 2 is communicated with the clarifier 3 through a wastewater delivery pump 7. The bottom of the clarifier 3 is connected with a dehydrator 12 through a clarifier underflow pump 8.

The top of the clear water tank 5 is provided with a drug feeding port capable of adjusting pH. The lower part of the clean water tank 5 is connected with a clean water discharge pipeline through a clean water pump 9.

When the device is used, desulfurization wastewater overflows to the precipitator 1 from a desulfurization system, and supernatant overflows to the wastewater reaction box 2 after the desulfurization wastewater stays in the precipitator 1 for a certain time. The underflow is gypsum slurry, is conveyed to the desulfurization absorption tower 11 through a precipitator underflow pump 6, and is used as a seed crystal to participate in desulfurization of the desulfurization absorption tower 11 again.

Through setting up the concentration of the preliminary reduction suspended solid in the desulfurization waste water of precipitator 1, the concentration of suspended solid is higher, and the effect of precipitator 1 is just bigger, so can adapt to more abominable operating mode. The precipitator 1 plays the role of pre-precipitation and water quality buffering.

After the wastewater passes through the precipitator 1, most suspended matters in the wastewater return to the desulfurization absorption tower 11 through natural sedimentation by a pump, supernatant overflows to the wastewater reaction box 2 from the precipitator 1, and a wastewater treatment agent is added into the wastewater reaction box 2, so that heavy metal ions and suspended matters in the wastewater are converted into precipitation floccules and are conveyed to an inlet of the clarifier 3 by a wastewater conveying pump 7. This device only adds a waste water treatment medicament, and this medicament is the likepowder solid interpolation, directly adds to desulfurization waste water after by charge device 10 measurement in, charge device 10 carries out chain matching with waste water flow, nimble adjustment charge. After adding chemicals, the wastewater stays in the wastewater reaction tank 2 for a certain time and is conveyed to the clarifier 3 by the wastewater conveying pump 7 for sedimentation.

Under the action of high-efficiency chemicals, the wastewater is suspended into grown floccules and rapidly settled in the clarifier 3. Clean water overflows from the clarifier 3 to the fine filter 4. The purpose of the fine filter 4 is to further reduce suspended matter in the wastewater after the overflow of the clarifier 3. Suspended matters deposited by the underflow are conveyed to a dehydrator 12 through a clarifier underflow pump 8 to be dehydrated.

Clear water enters the clear water tank 5 after passing through the precision filter 4 and is discharged outside through the clear water pump 9. When the pH value of the desulfurization waste water is lower than 6, the pH value is adjusted by adding alkali liquor into the clear water tank 5 so as to meet the discharge standard.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims (7)

1. A desulfurization wastewater treatment device is characterized in that: the device comprises a precipitator (1), wherein the upper part of the precipitator (1) is communicated with a wastewater reaction tank (2), the bottom of the precipitator (1) is communicated with a desulfurization absorption tower (11), the lower part of the wastewater reaction tank (2) is communicated with a clarifier (3), the upper part of the clarifier (3) is communicated with the top of a precision filter (4), and the lower part of the precision filter (4) is communicated with the top of a clear water tank (5).

2. The desulfurization wastewater treatment apparatus according to claim 1, characterized in that: the precipitator (1) is communicated with the desulfurization absorption tower (11) through a precipitator underflow pump (6).

3. The desulfurization wastewater treatment apparatus according to claim 2, characterized in that: the top of the wastewater reaction box (2) is provided with a dosing device (10).

4. The desulfurization wastewater treatment apparatus according to claim 3, characterized in that: the lower part of the wastewater reaction tank (2) is communicated with the clarifier (3) through a wastewater delivery pump (7).

5. The desulfurization wastewater treatment apparatus according to claim 4, characterized in that: the bottom of the clarifier (3) is connected with a dehydrator (12) through a clarifier underflow pump (8).

6. The desulfurization wastewater treatment apparatus according to claim 5, characterized in that: the top of the clear water tank (5) is provided with a drug adding port capable of adjusting pH.

7. The desulfurization wastewater treatment apparatus according to claim 6, characterized in that: the lower part of the clean water tank (5) is connected with a clean water discharge pipeline through a clean water pump (9).

Images