CN212403827U - Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant - Google Patents

Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant Download PDF

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Publication number
CN212403827U
CN212403827U CN202020678100.0U CN202020678100U CN212403827U CN 212403827 U CN212403827 U CN 212403827U CN 202020678100 U CN202020678100 U CN 202020678100U CN 212403827 U CN212403827 U CN 212403827U
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flue gas
flue
evaporation unit
power plant
desulfurization
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CN202020678100.0U
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Chinese (zh)
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麻晓越
刘海洋
谷小兵
白玉勇
刘维华
李叶红
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Datang Environment Industry Group Co Ltd
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Datang Environment Industry Group Co Ltd
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Abstract

The utility model provides a desulfurization waste water zero discharge system utilizing the waste heat of flue gas of a power plant, which comprises a waste water adjusting tank, a high-density sedimentation tank, a low-temperature multistage flash evaporation unit and a bypass flue evaporation unit which are connected in sequence; and the wastewater adjusting tank is communicated with a desulfurization wastewater discharge pipeline of the flue gas wet desulfurization absorption tower. In the utility model, the pH value of the desulfurization wastewater is improved by adding the medicament into the wastewater adjusting tank; the high-density sedimentation tank realizes the high-efficiency pretreatment of the desulfurization wastewater through flocculation, sedimentation and clarification; the low-temperature multi-stage flash unit can utilize the waste heat of the flue gas to realize the multi-stage flash concentration reduction and the moisture recovery of the wastewater; the bypass flue evaporation unit can utilize the waste heat of flue gas to realize the treatment of waste water evaporative crystallization. Compared with the prior art, the utility model adopts the high-density sedimentation tank to pretreat the desulfurization wastewater, thereby reducing the occupied area; the flue gas low-temperature multistage flash evaporation unit and the bypass flue evaporation unit both utilize heat carried by flue gas, an external heating source is not needed, and the operation cost is reduced.

Description

Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant
Technical Field
The utility model relates to a waste water treatment technical field especially relates to an utilize desulfurization waste water zero release system of flue gas waste heat of power plant.
Background
At present, the SO in the flue gas is generally removed by limestone/gypsum wet desulphurization technology in coal-fired power plants2The produced desulfurization wastewater has complex water quality and has the characteristics of high content of suspended matters, high salt content, high hardness, high content of chloride ions and overproof COD, fluoride and heavy metal contents. At present, the standard-reaching discharge of the desulfurization wastewater is treated by adopting a chemical precipitation method, mainly, pollutants such as heavy metal, suspended matters and the like in the desulfurization wastewater are removed by adding medicaments for oxidation, neutralization, precipitation, flocculation and other processes, but the salt content in the discharged water is still very high and is easy to corrode and scale, so that the wastewater reuse rate is very low.
The pretreatment unit in the desulfurization wastewater zero discharge process commonly adopted at present is provided with structures such as a wastewater buffer tank, a flocculation reaction tank, a sedimentation tank, a clarification tank and the like, the occupied area is large, more pipelines need to be laid, and the maintenance and the management are not easy. The thermal concentration technology commonly used for concentration and decrement has high energy consumption, and the membrane method decrement technology is easy to pollute and block, thereby increasing the operation cost.
SUMMERY OF THE UTILITY MODEL
Therefore, an object of the utility model is to provide a small in floor area, the desulfurization waste water zero discharge system of the flue gas waste heat of utilization power plant that running cost is low.
The utility model provides a desulfurization waste water zero discharge system utilizing the waste heat of flue gas of a power plant, which comprises a waste water adjusting tank, a high-density sedimentation tank, a low-temperature multistage flash evaporation unit and a bypass flue evaporation unit which are connected in sequence; the waste water equalizing basin is linked together with the desulfurization waste water discharge pipeline of flue gas wet flue gas desulfurization absorption tower, low temperature multistage flash distillation unit and bypass flue evaporation unit are all linked together through pipeline and power plant's flue gas discharge pipeline. In the utility model, the pH value of the desulfurization wastewater is improved by adding the medicament into the wastewater adjusting tank; the high-density sedimentation tank realizes the high-efficiency pretreatment of the desulfurization wastewater through flocculation, sedimentation and clarification; the low-temperature multi-stage flash unit can utilize the waste heat of the flue gas to realize the multi-stage flash concentration reduction and the moisture recovery of the wastewater; the bypass flue evaporation unit can utilize the waste heat of flue gas to realize the treatment of waste water evaporative crystallization. Compared with the prior art, the utility model adopts the high-density sedimentation tank to pretreat the desulfurization wastewater, thereby reducing the occupied area; the flue gas low-temperature multistage flash evaporation unit and the bypass flue evaporation unit both utilize heat carried by flue gas, an external heating source is not needed, and the operation cost is reduced.
Further, a gypsum slurry dehydration unit is arranged between the wastewater adjusting tank and the flue gas wet desulphurization absorption tower, and the wastewater adjusting tank is provided with an acid-base adjusting agent adding device.
Further, the high-density sedimentation tank comprises a mixing zone, a flocculation zone and a sedimentation zone which are sequentially communicated, the mixing zone is provided with a mixed reaction agent adding device, the flocculation zone is provided with a coagulation assisting agent adding device, and the sedimentation zone is provided with a sludge conveying device.
Further, the sludge treatment device comprises a sludge treatment unit, the sludge conveying device comprises a sludge return pipeline and a sludge discharge pipeline, the sludge return pipeline is communicated with the flocculation area, and the sludge discharge pipeline is communicated with the sludge treatment unit.
Further, the low-temperature multistage flash evaporation unit is communicated with a flue between the electric dust remover and the flue gas wet desulphurization absorption tower through a pipeline.
Further, the low-temperature multistage flash evaporation unit comprises a heater and a plurality of flash evaporation chambers, each flash evaporation chamber is provided with an air suction port, a water inlet, a concentrated water drainage port and a fresh water drainage port, and the concentrated water drainage ports are communicated with the bypass flue evaporation unit.
Furthermore, the smoke inlet of the bypass flue evaporation unit is communicated with a flue in front of the air preheater through a pipeline, and the smoke outlet of the bypass flue evaporation unit is communicated with the flue between the air preheater and the electric dust remover through a pipeline.
Further, the bypass flue evaporation unit includes an evaporator having an atomizing nozzle therein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram showing a zero discharge system of desulfurization waste water using waste heat of flue gas from a power plant;
fig. 2 shows a schematic process flow diagram of a low temperature multi-stage flash unit.
In the drawings are labeled:
1 wastewater adjusting tank
2 high-density sedimentation tank
3 low temperature multi-stage flash unit
31 heater
32 flash chamber
321 air extraction opening
322 water inlet
323 concentrated water outlet
324 fresh water outlet
4 bypass flue evaporation unit
5 sludge disposal unit
6 gypsum slurry dewatering unit
7 boiler
8 air preheater
9 electric dust remover
10 flue gas wet desulphurization absorption tower
11 chimney
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides an utilize desulfurization waste water zero release system of flue gas waste heat of power plant, as shown in figure 1, include: the system comprises a wastewater adjusting tank 1, a high-density sedimentation tank 2, a low-temperature multistage flash evaporation unit 3 and a bypass flue evaporation unit 4 which are connected in sequence; waste water equalizing basin 1 is linked together with the desulfurization waste water discharge pipeline of flue gas wet flue gas desulfurization absorption tower 10, low temperature multistage flash unit 3 and bypass flue evaporation unit 4 all are linked together through pipeline and power plant's flue gas discharge pipeline. In the utility model, the wastewater adjusting tank 1 increases the pH value of the desulfurization wastewater by adding a medicament; the high-density sedimentation tank 2 realizes the high-efficiency pretreatment of the desulfurization wastewater through flocculation, sedimentation and clarification; the low-temperature multi-stage flash unit 3 can utilize the waste heat of the flue gas to realize the multi-stage flash concentration and reduction of the wastewater and the recovery of moisture; the bypass flue evaporation unit 4 can utilize the waste heat of the flue gas to realize the treatment of waste water evaporation crystallization. Compared with the prior art, the utility model adopts the high-density sedimentation tank to pretreat the desulfurization wastewater, thereby reducing the occupied area; the flue gas low-temperature multistage flash evaporation unit and the bypass flue evaporation unit both utilize heat carried by flue gas, an external heating source is not needed, and the operation cost is reduced.
Specifically, refer to fig. 1, the utility model discloses can cooperate boiler flue gas exhaust pipe to use, when carrying out desulfurization waste water treatment, can also recycle flue gas waste heat, reduce running cost. Fig. 1 shows a flue gas channel consisting of a boiler 7, an air preheater 8, an electric dust remover 9, a wet flue gas desulfurization absorption tower 10 and a chimney 11. The low-temperature multistage flash evaporation unit 3 is communicated with a flue between an electric dust remover 9 and a flue gas wet desulphurization absorption tower 10 through a pipeline; the smoke inlet of the bypass flue evaporation unit 4 is communicated with the flue in front of the air preheater 8 through a pipeline, and the smoke outlet of the bypass flue evaporation unit 4 is communicated with the flue between the air preheater 8 and the electric dust remover 9 through a pipeline. Wherein, low-temperature flue gas is introduced into the low-temperature multi-stage flash unit 3 and is used for carrying out primary concentration treatment on the desulfurization wastewater to form strong brine; high-temperature flue gas is introduced into the bypass flue evaporation unit 4 so as to evaporate and crystallize the strong brine and then discharge the strong brine.
The utility model discloses an aspect of embodiment, be provided with gypsum slurry dewatering unit 6 between waste water equalizing basin 1 and the flue gas wet flue gas desulfurization absorption tower 10, gypsum slurry dewatering unit 6 carries the gypsum after will dehydrating to the gypsum repository, and the desulfurization waste water of production carries extremely waste water equalizing basin 1, waste water equalizing basin 1 has the acid-base and adjusts the medicament and throw with the device. In the specific operation process, after the desulfurization wastewater enters the wastewater adjusting tank 1, agents such as lime milk or caustic soda and the like are added to adjust the pH value of the wastewater to be more than 9.0 so as to remove partial magnesium ions, heavy metal ions, fluorine ions, sulfate ions, sulfite ions and the like in the wastewater, and the generated sludge is discharged into a sludge disposal unit through a sludge conveying device.
The utility model discloses an aspect of embodiment, high density sedimentation tank 2 is including the mixing area, flocculation area and the settling zone that communicate in proper order, the mixing area has mixed reaction medicament and throws the feeder apparatus, the flocculation area has and helps the coagulation medicament to throw the feeder apparatus, the settling zone has sludge conveyor. In the specific operation process, softening agent, flocculating agent and organic sulfur are added into the mixing zone and stirred at a higher speed to form small floc alum floc; then the wastewater flows into a flocculation area, coagulant aids are added, and large floc alum floc is formed by slow stirring under the combined action of return sludge from a settling area; the wastewater containing floc alum floc flows into a precipitation zone for precipitation and clarification, and the discharged liquid enters a low-temperature multi-stage flash unit 3 through a pipeline. Preferably, the utility model discloses still have sludge treatment unit 5, the settling zone bottom has sludge conveyor to through sludge conveyor with the higher mud backward flow of part water content to flocculation area, surplus sludge discharges to sludge treatment unit 5 through the pipeline and carries out follow-up processing.
In one aspect of the embodiment of the present invention, as shown in fig. 2, the low-temperature multi-stage flash evaporation unit 3 includes a heater 31 and a plurality of flash evaporation chambers 32, each flash evaporation chamber 32 has a suction opening 321, a water inlet 322, a concentrated water discharge opening 323 and a fresh water discharge opening 324, and the concentrated water discharge opening 323 is communicated with the bypass flue evaporation unit 4. The waste water is subjected to low-temperature flash evaporation in a flash evaporation chamber 32 of the low-temperature multistage flash evaporation unit 3 at the operating temperature of 50-80 ℃ and the operating pressure of 5-50kPa, the generated steam is condensed and collected, then is conveyed to a water collecting tank through a fresh water outlet 324 and is recycled to a power plant, and the generated concentrated brine is conveyed to a bypass flue evaporation unit 4 through a pipeline. Wherein, heater 31 is heated by the flue gas waste heat of retrieving, retrieves the fresh water after the condensation through the catch basin, can recycle, is favorable to the water economy resource, reduces the power plant running cost.
Wherein, the specific principle of low temperature multistage flash unit 3 work is: the flash evaporation is to heat the wastewater to a certain temperature by using a heater 31 and then introduce the wastewater into a flash evaporation chamber 32, and as the pressure in the flash evaporation chamber 32 is controlled to be lower than the saturated vapor pressure corresponding to the temperature of the wastewater through an extraction opening 321, the wastewater enters the flash evaporation chamber through a water inlet 322 and is rapidly partially gasified due to overheating, so that the temperature of the wastewater is reduced, and the generated vapor is condensed to be the required fresh water. The multi-stage flash evaporation is based on the principle, preheated wastewater is heated to a certain temperature under a certain pressure and is introduced into a first flash evaporation chamber, the pressure is reduced to enable the wastewater to be flash evaporated, generated steam is condensed outside a heat exchange pipe to form fresh water, and the temperature of the remained wastewater is reduced to a corresponding saturation temperature; after the concentrated wastewater is introduced, each flash chamber 32 is subjected to step-by-step pressure reduction and flash evaporation sequentially, the temperature in each flash chamber 32 is gradually reduced, and simultaneously, the brine is gradually thickened until the temperature of the brine is close to the temperature of the original wastewater, so that the wastewater is concentrated and flows out of a concentrated water discharge port 323 to the bypass flue evaporation unit 4, and the condensed fresh water flows out of a water collecting tank through a fresh water discharge port 324 for recycling. The utility model discloses in utilize multistage flash distillation unit 3 of low temperature of flue gas waste heat, utilize the flue gas as the heat source, heat the raw water through heater 31, realize multistage flash distillation, output fresh water and strong brine respectively. The multistage flash system has good antiscaling performance and better adaptability to salt concentration.
The embodiment of the utility model provides an aspect, as shown in FIG. 2, bypass flue evaporation unit 4's the flue that advances mouth is linked together through pipeline and air preheater 8 before, bypass flue evaporation unit 4's outlet flue is linked together through pipeline and air preheater 8 and the flue between the electrostatic precipitator 9. Wherein the bypass flue evaporation unit 4 comprises an evaporator having an atomizing nozzle therein. In the specific work, the strong brine flowing out from the low-temperature multistage flash evaporation unit 3 enters the bypass flue evaporation unit 4, the evaporation and crystallization of the strong brine are realized at the temperature of 300-380 ℃, the crystallized salt is discharged into the flue in front of the electric dust collector 9, and the crystallized salt is collected by the electric dust collector 9 and then discharged.
Wherein, the specific principle of bypass flue evaporation unit 4 work is: the bypass flue evaporation is to add a bypass flue evaporator, lead out a bypass flue from the main flue in front of the air preheater 8, and lead a small amount of high-temperature flue gas in front of the air preheater 8 into the evaporator of the bypass flue evaporation unit 4; the desulfurization waste water is conveyed into an evaporator through a pipeline, and the waste water is atomized through an atomizing nozzle in the evaporator under the action of high-speed compressed air; the high-temperature flue gas entering the evaporator evaporates and crystallizes the atomized desulfurization wastewater, the formed crystallized salt is collected at the bottom of the evaporator, and then is discharged into the main flue in front of the electric dust collector 9 along with the bypass flue at the bottom, and the crystallized salt is collected by the electric dust collector 9 and then is discharged along with the fly ash.
To sum up, the beneficial effects of the utility model include:
(1) the pretreatment effect is improved, and the occupied area is reduced. The high-density sedimentation tank is adopted for pretreatment of the desulfurization wastewater, so that the occupied area is reduced, and the sedimentation efficiency and the effluent quality are improved.
(2) The operation cost is reduced. A part of sludge in the high-density sedimentation tank flows back to strengthen the flocculation effect, reduce the dosage of the medicament and reduce the treatment capacity of the residual sludge; the flue gas low-temperature multistage flash evaporation unit and the bypass flue evaporation unit both utilize heat carried by flue gas, and an external heating source is not needed; the crystallized salt generated by the bypass flue evaporation unit is collected by the electric dust collector and is discharged together with the fly ash, and the operation cost can be reduced without separate treatment.
(3) The recycling of water is realized. Condensed water discharged by the cold condensed water module in the low-temperature multi-stage flash evaporation unit of the flue gas can be recycled to a power plant to be used as supplementary water, so that water resources are saved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (8)

1. The utility model provides an utilize desulfurization waste water zero release system of flue gas waste heat of power plant which characterized in that includes:
the system comprises a wastewater adjusting tank, a high-density sedimentation tank, a low-temperature multi-stage flash evaporation unit and a bypass flue evaporation unit which are connected in sequence;
the waste water equalizing basin is linked together with the desulfurization waste water discharge pipeline of flue gas wet flue gas desulfurization absorption tower, low temperature multistage flash distillation unit and bypass flue evaporation unit are all linked together through pipeline and power plant's flue gas discharge pipeline.
2. The system of claim 1, wherein the zero discharge system of desulfurization waste water using the waste heat of flue gas from power plant,
and a gypsum slurry dehydration unit is arranged between the wastewater adjusting tank and the flue gas wet desulphurization absorption tower, and the wastewater adjusting tank is provided with an acid-base adjusting agent adding device.
3. The system of claim 1, wherein the zero discharge system of desulfurization waste water using the waste heat of flue gas from power plant,
the high-density sedimentation tank comprises a mixing zone, a flocculation zone and a sedimentation zone which are sequentially communicated, the mixing zone is provided with a mixed reaction medicament adding device, the flocculation zone is provided with a coagulation aid medicament adding device, and the sedimentation zone is provided with a sludge conveying device.
4. The system of claim 3, wherein the zero discharge system of the desulfurization waste water by using the waste heat of the flue gas of the power plant,
the sludge treatment device comprises a sludge return pipeline and a sludge discharge pipeline, the sludge return pipeline is communicated with the flocculation area, and the sludge discharge pipeline is communicated with the sludge treatment unit.
5. The system of claim 1, wherein the zero discharge system of desulfurization waste water using the waste heat of flue gas from power plant,
and the low-temperature multistage flash evaporation unit is communicated with a flue between the electric dust remover and the flue gas wet desulphurization absorption tower through a pipeline.
6. The system of claim 5, wherein the zero discharge system of the desulfurization waste water by using the waste heat of the flue gas of the power plant,
the low-temperature multistage flash evaporation unit comprises a heater and a plurality of flash evaporation chambers, each flash evaporation chamber is provided with an air suction port, a water inlet, a concentrated water drainage port and a fresh water drainage port, and the concentrated water drainage ports are communicated with the bypass flue evaporation unit.
7. The system of claim 1, wherein the zero discharge system of desulfurization waste water using the waste heat of flue gas from power plant,
the smoke inlet of the bypass flue evaporation unit is communicated with a flue in front of the air preheater through a pipeline, and the smoke outlet of the bypass flue evaporation unit is communicated with the flue between the air preheater and the electric dust remover through a pipeline.
8. The system of claim 7, wherein the zero discharge system of desulfurization waste water using the waste heat of flue gas from power plant,
the bypass flue evaporation unit comprises an evaporator with an atomizing nozzle therein.
CN202020678100.0U 2020-04-28 2020-04-28 Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant Active CN212403827U (en)

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CN202020678100.0U CN212403827U (en) 2020-04-28 2020-04-28 Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020678100.0U CN212403827U (en) 2020-04-28 2020-04-28 Desulfurization wastewater zero discharge system utilizing flue gas waste heat of power plant

Publications (1)

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CN212403827U true CN212403827U (en) 2021-01-26

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