CN216273192U - Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system - Google Patents
Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system Download PDFInfo
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- CN216273192U CN216273192U CN202122935267.8U CN202122935267U CN216273192U CN 216273192 U CN216273192 U CN 216273192U CN 202122935267 U CN202122935267 U CN 202122935267U CN 216273192 U CN216273192 U CN 216273192U
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Abstract
The utility model discloses a power plant wastewater anti-blocking system by utilizing high-temperature flue gas to evaporate, which comprises a power plant main flue, a wastewater evaporation tower, a wastewater back-spraying conveying pipeline and a dosing device, wherein the power plant main flue is provided with a flue gas inlet and a flue gas outlet; the main flue of the power plant comprises a main flue dust remover, a wet desulphurization tower and a chimney which are sequentially connected through the main flue; the waste water evaporation tower is connected to a main flue between the main flue dust remover and the wet desulphurization tower through a first bypass flue, a flue gas outlet of the waste water evaporation tower is connected with a bypass flue dust remover at the rear through a flue, and the bypass flue dust remover is connected to the main flue at the front end of the wet desulphurization tower through a second bypass flue. Waste water spouts pipeline one end back and is connected to the wet flue gas desulfurization tower, and the other end is connected with the nozzle that sets up at waste water evaporation tower top, spouts the desulfurization waste water of discharge in the wet flue gas desulfurization tower back to the dry by distillation in the waste water evaporation tower. The dosing device is connected on the waste water back-spraying conveying pipeline and is used for adding the agent for preventing caking into the desulfurization waste water in the waste water back-spraying conveying pipeline.
Description
Technical Field
The utility model belongs to the field of wastewater treatment, and particularly relates to a power plant wastewater anti-blocking system by utilizing high-temperature flue gas to evaporate.
Background
The thermal power plant has various types such as coal, gas and waste incineration, the daily water consumption and water discharge are very large, and the treatment work of the desulfurization waste water faces huge pressure along with the issuance and implementation of various national environmental protection laws and regulations and water-saving plans. The traditional treatment method can not meet the requirements of environmental protection laws and policies.
Although the prior art scheme can meet the requirement of wastewater treatment, two huge problems are faced in the operation process: 1. when the desulfurization waste water returns to the main flue or the bypass evaporator for evaporation, the total dissolved solids can not enter the dust remover along with the flue gas after the moisture is evaporated to dryness, most of the total dissolved solids can be separated out on the inner wall to form large-area hard blocks, so that the operation condition of the system is rapidly deteriorated, the spray gun can be blocked while the flue is blocked, the atomization effect is influenced, and the system is finally stopped to influence normal production. 2. After the desulfurization waste water is evaporated by using flue gas, the salt content of the fly ash in the flue gas is too high, the recycling of the fly ash is influenced, the landfill cost is increased, and huge economic loss is caused to enterprises. Therefore, the prior technical scheme can not only treat the desulfurization wastewater, but also ensure the stable and continuous production operation of the system.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the technical problem to be solved by the utility model is to provide an anti-blocking system for power plant wastewater evaporated by high-temperature flue gas, which effectively solves the problem that desulfurization wastewater is difficult to clean after being solidified in the flue evaporation process, and simultaneously can solve the problem of recycling of fly ash, so that continuous operation of production can be ensured while desulfurization wastewater is treated, and huge economic value is created for enterprises.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides an utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system, includes power plant's flue stack, waste water evaporation tower, waste water back spray pipeline and charge device.
The main flue of the power plant comprises a power plant boiler, a denitration device, an air preheater, a main flue dust remover, a wet desulphurization tower and a chimney which are sequentially connected through the main flue.
The waste water evaporation tower is connected to a main flue between the main flue dust remover and the wet desulphurization tower through a first bypass flue, a flue gas outlet of the waste water evaporation tower is connected with a bypass flue dust remover at the rear through a flue, and the bypass flue dust remover is connected to the main flue at the front end of the wet desulphurization tower through a second bypass flue.
Waste water spouts pipeline one end back and is connected to the wet flue gas desulfurization tower, and the other end is connected with the nozzle that sets up at waste water evaporation tower top, spouts the desulfurization waste water of discharge in the wet flue gas desulfurization tower back to the dry by distillation in the waste water evaporation tower.
The dosing device is connected on the wastewater back-spraying conveying pipeline and is used for adding the agent for preventing caking into the desulfurization wastewater in the wastewater back-spraying conveying pipeline.
Furthermore, a main flue gate is arranged on the main flue between the connection part of the first bypass flue and the second bypass flue; a smoke inlet gate is arranged at the joint of the first bypass flue and the main flue; a smoke outlet gate is arranged at the position, close to the main flue, of the second bypass flue; when the smoke inlet gate and the smoke outlet gate are opened and the main flue gate is closed, high-temperature smoke in the main flue enters the wastewater evaporation tower, is mixed and evaporated with desulfurization wastewater sprayed into the wastewater evaporation tower at the same time, then returns to the main flue through the second bypass flue and is discharged for subsequent desulfurization treatment; when the smoke inlet gate and the smoke outlet gate are closed and the main flue gate is opened, high-temperature smoke is blocked from entering the wastewater evaporation tower, and all the smoke is discharged to subsequent desulfurization treatment through the main flue.
Furthermore, the bottom of the waste water evaporation tower and the bottom of the bypass flue dust remover are connected to an ash discharge hopper together, and ash containing salt is collected.
Specifically, the wastewater back-spray conveying pipeline comprises a desulfurization wastewater storage pool and an adjusting pool which are sequentially connected through a desulfurization wastewater conveying pipeline, and desulfurization wastewater is adjusted in the adjusting pool to adjust the pH value and then is back-sprayed into the wastewater evaporation tower to be mixed with high-temperature flue gas, so that the desulfurization wastewater is evaporated to dryness.
Specifically, charge device includes a set of medicine pipeline, is connected to desulfurization waste water storage pond, equalizing basin, desulfurization waste water pipeline through adding the medicine pipeline more than arbitrary, will prevent that the medicament of caking from adding to the desulfurization waste water.
Specifically, when the dosing pipeline of the dosing device is connected to the desulfurization wastewater storage pool and/or the adjusting pool, the desulfurization wastewater storage pool and/or the adjusting pool is provided with a corresponding stirring device or an aeration device for uniformly mixing the added medicament and the desulfurization wastewater.
Specifically, a dosing pipeline of the dosing device is connected with a desulfurization wastewater conveying pipeline through a mixer, and the added medicament and the desulfurization wastewater are uniformly mixed in the mixer and then are sent into a wastewater evaporation tower together to be mixed and evaporated with high-temperature flue gas.
Specifically, the dosing device comprises a medicament barrel, a dosing pipeline, a metering pump, a ball valve and an electric cabinet; one end of the dosing pipeline is connected with the medicament barrel, and the other end of the dosing pipeline is connected to the wastewater back-spraying conveying pipeline; the ball valve is arranged at the end part of the dosing pipeline connected with the medicament barrel, the metering pump is positioned on the dosing pipeline and is in signal connection with the electric cabinet, and the medicament in the medicament barrel is fed into the waste water back-spraying conveying pipeline through the metering pump through the dosing pipeline.
Furthermore, a Y-shaped filter and a back pressure valve are further arranged on the dosing pipeline, and the Y-shaped filter and the back pressure valve are sequentially arranged between the ball valve and the metering pump.
And further, a desulfurization waste water discharge pump is arranged on the waste water back-spraying conveying pipeline and is in signal connection with the electric cabinet.
Has the advantages that:
1. the auxiliary flue is arranged on the main flue, so that a main flue gate can be closed, a smoke inlet gate and a smoke outlet gate can be opened, and the desulfurization wastewater is evaporated by high-temperature flue gas in production; when dust is deposited and caked, the main flue gate is opened, the smoke inlet gate and the smoke outlet gate are closed, the main flue is separated from the main flue and then is cleaned independently, normal production operation of the system is not affected, and the main flue can be connected with the main flue again to treat the desulfurization wastewater after being cleaned.
2. The waste water evaporation tower is arranged on a main flue between a main flue dust remover and a wet desulphurization device, and a bypass flue dust remover is added at the outlet end of the waste water evaporation tower; the main flue dust remover is used for filtering fly ash, the bypass flue dust remover is used for filtering a large amount of harmful components generated by spraying desulfurization wastewater back to the wastewater evaporation tower, and the flue gas filtered by the bypass flue dust remover returns to the main flue again and is discharged for subsequent treatment.
3. Compared with the prior art that only a small amount of flue gas can be used for treating part of desulfurization wastewater, the system can effectively solve the application problems of different sites and different working conditions, reduce the stopping condition of the system caused by the blockage of the evaporation desulfurization wastewater, treat the desulfurization wastewater by utilizing the flue gas to the maximum extent, solve all the desulfurization wastewater problems in a plant area, simultaneously, do not influence the recycling of fly ash by a power plant, improve the system operation efficiency, solve the problem of the removal of the desulfurization wastewater, ensure the continuous production of enterprises, reduce the landfill cost and bring huge economic value to the enterprises.
Drawings
The foregoing and/or other advantages of the utility model will become further apparent from the following detailed description of the utility model when taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic diagram of the overall structure of a power plant wastewater anti-blocking system by high temperature flue gas evaporation according to the present invention.
Wherein each reference numeral represents:
10 power plant boilers; 20 a denitration device; 30 air preheater; 40 main flue dust remover; 50 a wet desulfurization tower; 60, a chimney; 70, a main flue; 701, a main flue gate; 702 a first bypass flue; 703 smoke inlet gate; 704 a second bypass flue; 705 a smoke outlet gate; 80 a waste water evaporation tower; an ash hopper with 81 rows; 90 bypass flue dust collector; 100, a medicine adding device; 101 a medicament cartridge; 102 a dosing line; 103 a metering pump; 104 ball valve; 105 an electric cabinet; a 106Y filter; 107 back pressure valve; 200 waste water back-spraying conveying pipeline; 201 a desulfurization waste water storage tank; 202 a desulfurization waste water conveying pipeline; 203, a regulating pool; 204 desulfurization wastewater discharge pump; 205 mixer.
Detailed Description
The utility model will be better understood from the following examples.
As shown in FIG. 1, the anti-blocking system for power plant wastewater evaporation by using high temperature flue gas of the present invention comprises a power plant main flue, a wastewater evaporation tower 80, a wastewater back-spray conveying pipeline 200 and a chemical adding device 100.
The main flue of the power plant comprises a power plant boiler 10, a denitration device 20, an air preheater 30, a main flue dust remover 40, a wet desulphurization tower 50 and a chimney 60 which are sequentially connected through a main flue 70.
The waste water evaporation tower 80 is connected to the main flue 70 between the main flue dust remover 40 and the wet desulphurization tower 50 through a first bypass flue 702, the flue gas outlet of the waste water evaporation tower 80 is connected to the rear bypass flue dust remover 90 through a flue, and the bypass flue dust remover 90 is connected back to the main flue at the front end of the wet desulphurization tower 50 through a second bypass flue 704.
One end of the wastewater back-spraying conveying pipeline 200 is connected to the wet desulphurization tower 50, and the other end is connected with a nozzle arranged at the top of the wastewater evaporation tower 80, so that the desulphurization wastewater discharged from the wet desulphurization tower 50 is back-sprayed into the wastewater evaporation tower 80 to be evaporated to dryness.
The chemical adding device 100 is connected to the wastewater back-spray conveying pipeline 200 and is used for adding a medicament for preventing caking into the desulfurization wastewater in the wastewater back-spray conveying pipeline 200.
The main flue 70 is positioned between the joint of the first bypass flue 702 and the second bypass flue 704, and is provided with a main flue gate 701; a smoke inlet gate 703 is arranged at the position of the first bypass flue 702 close to the connection of the main flue; a smoke outlet gate 705 is arranged at the position, close to the main flue, of the second bypass flue 704; when the smoke inlet gate 703 and the smoke outlet gate 705 are opened and the main flue gate 701 is closed, the high-temperature flue gas in the main flue 70 enters the wastewater evaporation tower 80, is mixed and evaporated with the desulfurization wastewater sprayed into the wastewater evaporation tower 80 at the same time, then returns to the main flue 70 through the second bypass flue 704, and is discharged for subsequent desulfurization treatment; when the smoke inlet gate 703 and the smoke outlet gate 705 are closed and the main flue gate 701 is opened, the high-temperature flue gas is blocked from entering the wastewater evaporation tower 80, and all the flue gas is discharged through the main flue 70 and then is subjected to the subsequent desulfurization treatment.
The bottom of the waste water evaporation tower 80 and the bottom of the bypass flue dust collector 90 are connected to an ash discharge hopper 81, and ash containing salt is collected. Firstly, the main flue dust collector 40 can intercept most of the fly ash in the high-temperature flue gas, and the fly ash can be used as an industrial byproduct fly ash product after being discharged from the main flue dust collector 40. The high temperature flue gas trapped by the main flue dust collector 40 then enters the wastewater evaporation tower 80 and is trapped by the bypass flue dust collector 90 again, and the part of the fly ash contains more salt, so the fly ash is not suitable for being used as a product.
The wastewater back-spray conveying pipeline 200 comprises a desulfurization wastewater storage tank 201 and an adjusting tank 203 which are sequentially connected through a desulfurization wastewater conveying pipeline 202, wherein the desulfurization wastewater is back-sprayed into the wastewater evaporation tower 80 after the pH value of the desulfurization wastewater is adjusted by the adjusting tank 203 and is mixed with high-temperature flue gas, so that the desulfurization wastewater is evaporated to dryness.
The dosing device 100 comprises a group of dosing pipelines 102, and is connected to any one or more of the desulfurization wastewater storage pool 201, the regulating pool 203 and the desulfurization wastewater conveying pipeline 202 through the dosing pipelines 102, and the agent for preventing caking is added into the desulfurization wastewater.
When the dosing pipeline 102 of the dosing device 100 is connected to the desulfurization wastewater storage tank 201 and/or the adjusting tank 203, a corresponding stirring device or an aeration device is arranged in the desulfurization wastewater storage tank 201 and/or the adjusting tank 203 and is used for uniformly mixing the added medicament and the desulfurization wastewater.
The chemical feeding pipeline 102 of the chemical feeding device 100 is connected with the desulfurization wastewater conveying pipeline 202 through the mixer 205, the added chemical and the desulfurization wastewater are uniformly mixed in the mixer 205, and then are sent into the wastewater evaporation tower 80 together to be mixed and evaporated with the high-temperature flue gas.
The dosing device 100 comprises a medicament barrel 101, a dosing pipeline 102, a metering pump 103, a ball valve 104 and an electric cabinet 105; one end of the drug adding pipeline 102 is connected with the drug barrel 101, and the other end is connected to the wastewater back-spraying conveying pipeline 200; the ball valve 104 is arranged at the end part of the dosing pipeline 102 connected with the medicament barrel 101, the metering pump 103 is positioned on the dosing pipeline 102 and is in signal connection with the electric cabinet 105, and the medicament in the medicament barrel 101 is sent into the wastewater back-spraying conveying pipeline 200 through the dosing pipeline 102 by the metering pump 103.
The dosing pipeline 102 is also provided with a Y-shaped filter 106 and a back pressure valve 107, and the Y-shaped filter 106 and the back pressure valve 107 are sequentially arranged between the ball valve 104 and the metering pump 103.
And a desulfurization wastewater outward-discharging pump 204 is arranged on the wastewater back-spraying conveying pipeline 200, and the desulfurization wastewater outward-discharging pump 204 is in signal connection with the electric cabinet 105.
The working principle of the anti-blocking system for evaporating the power plant wastewater by utilizing the high-temperature flue gas is as follows:
firstly, high-temperature flue gas generated in the power plant boiler 10 is sequentially treated by the denitration device 20, the air preheater 30, the main flue dust remover 40 and the wet desulfurization tower 50 through the power plant main flue 70 and then is discharged into the atmosphere through the chimney 60.
The desulfurization waste water generated by desulfurization in the wet desulfurization tower 50 is collected in a desulfurization waste water storage tank 201 through a pipeline, treated by a regulating tank 203, sent into a waste water evaporation tower 80 connected with the main flue 30 through a desulfurization waste water delivery pipe 202 by a desulfurization waste water outward discharge pump 204 to be mixed with high-temperature flue gas, and the desulfurization waste water is evaporated by the high-temperature flue gas. The high-temperature flue gas in the main flue 30 firstly intercepts most of the fly ash through the main flue dust collector 40, and then enters the wastewater evaporation tower 80 through the first bypass flue 702.
Before the desulfurization wastewater is fed into the wastewater evaporation tower 80 to be mixed with the high-temperature flue gas, a medicament capable of preventing the wastewater from being hardened after evaporation, such as AES fatty alcohol polyoxyethylene ether sulfate, is added into the desulfurization wastewater through the dosing device 10. When the smoke inlet gate 703 and the smoke outlet gate 705 are opened and the main flue gate 701 is closed, the high-temperature flue gas in the main flue 70 enters the wastewater evaporation tower 80 to be mixed with the desulfurization wastewater sprayed into the wastewater evaporation tower 80 at the same time, the sulfur-containing wastewater is instantaneously evaporated by using the high-temperature flue gas, then the high-temperature flue gas enters the bypass flue dust remover 90 to remove the ash content containing salt, finally the high-temperature flue gas returns to the main flue 70 through the second bypass flue 704, and the sulfur-containing wastewater is discharged to the subsequent desulfurization treatment. When the smoke inlet gate 703 and the smoke outlet gate 705 are closed and the main flue gate 701 is opened, the high-temperature flue gas is blocked from entering the wastewater evaporation tower 80, and all the flue gas is discharged through the main flue 70 and then is subjected to the subsequent desulfurization treatment. At this moment, the waste water evaporation tower 80 can be subjected to ash removal and maintenance operations, and accumulated ash collected in the waste water evaporation tower 80 and the bypass flue dust remover 90 is discharged from the ash discharge port 81 for centralized treatment.
In different application scenarios, the chemical adding point of the chemical adding device 100 to the desulfurization wastewater may be adjusted, for example, added to the desulfurization wastewater conveying pipe 202, directly added to the desulfurization wastewater storage tank 201, or added to both the desulfurization wastewater conveying pipe 202 and the desulfurization wastewater storage tank 201. If the addition point is on the desulfurization wastewater conveying pipeline 202, the agent and the desulfurization wastewater need to be uniformly mixed by a mixer 205, such as a static mixer, and then are sprayed into the wastewater evaporation tower 80, and the precipitated salt-containing ash can be collected by the subsequent bypass flue dust remover 90. The flue gas in the main flue 40 is prevented from directly entering the waste water evaporation tower 80, so that the fly ash in the flue gas cannot be utilized.
Taking 30 ten thousand kw units as an example, about 1200 tons of coal are consumed per day, about 240 tons of fly ash are generated, the market recycling price is about 150 yuan/ton, 36000 yuan can be put in per day, and 1314 ten thousand yuan can be put in per year. If flue gas in the main flue is directly introduced into the wastewater evaporation tower 80 and used for evaporating the back-sprayed wastewater, a large amount of harmful components are mixed in the fly ash, the fly ash cannot be recycled, and benefits are generated, meanwhile, the landfill cost of about 240 tons of fly ash is additionally increased every day, the landfill cost is about 48 ten thousand yuan, and the cost of one year is about 17520 ten thousand yuan.
The utility model provides a thought and a method for evaporating a power plant wastewater anti-blocking system by using high-temperature flue gas, and a method and a way for realizing the technical scheme are many. All the components not specified in the present embodiment can be realized by the prior art.
Claims (7)
1. An anti-blocking system for evaporating power plant wastewater by using high-temperature flue gas is characterized by comprising a power plant main flue, a wastewater evaporation tower (80), a wastewater back-spraying conveying pipeline (200) and a dosing device (100);
the main flue of the power plant comprises a main flue dust collector (40), a wet desulphurization tower (50) and a chimney (60) which are sequentially connected through a main flue (70);
the waste water evaporation tower (80) is connected to a main flue (70) between a main flue dust remover (40) and the wet desulphurization tower (50) through a first bypass flue (702), a flue gas outlet of the waste water evaporation tower (80) is connected with a bypass flue dust remover (90) at the rear through a flue, and the bypass flue dust remover (90) returns to the main flue at the front end of the wet desulphurization tower (50) through a second bypass flue (704);
one end of the waste water back-spraying conveying pipeline (200) is connected to the wet desulphurization tower (50), the other end of the waste water back-spraying conveying pipeline is connected with a nozzle arranged at the top of the waste water evaporation tower (80), and the desulphurization waste water discharged from the wet desulphurization tower (50) is back-sprayed into the waste water evaporation tower (80) to be evaporated to dryness;
the dosing device (100) is connected to the wastewater back-spraying conveying pipeline (200) and is used for adding a medicament for preventing caking into the desulfurization wastewater in the wastewater back-spraying conveying pipeline (200).
2. The anti-blocking system for power plant wastewater evaporation by using high-temperature flue gas as claimed in claim 1, wherein a main flue gate (701) is arranged on the main flue (70) between the joint of the first bypass flue (702) and the second bypass flue (704); a smoke inlet gate (703) is arranged at the position, close to the main flue, of the first bypass flue (702); a smoke outlet gate (705) is arranged at the position, close to the main flue, of the second bypass flue (704); when the smoke inlet gate (703) and the smoke outlet gate (705) are opened and the main flue gate (701) is closed, high-temperature smoke in the main flue (70) enters the wastewater evaporation tower (80), is mixed and evaporated with desulfurization wastewater sprayed into the wastewater evaporation tower (80) at the same time, then returns to the main flue (70) through the second bypass flue (704), and is discharged for subsequent desulfurization treatment; when the smoke inlet gate (703) and the smoke outlet gate (705) are closed and the main flue gate (701) is opened, high-temperature smoke is prevented from entering the wastewater evaporation tower (80), and all the smoke is discharged to subsequent desulfurization treatment through the main flue (70).
3. The anti-blocking system for power plant wastewater evaporation by using high-temperature flue gas as claimed in claim 1, wherein the bottom of the wastewater evaporation tower (80) and the bottom of the bypass flue dust collector (90) are connected to an ash discharge hopper (81) together to collect ash containing salt.
4. The anti-blocking system for power plant wastewater evaporated by high-temperature flue gas as claimed in claim 1, wherein the wastewater back-spray conveying pipeline (200) comprises a desulfurization wastewater storage tank (201) and a regulating tank (203) which are sequentially connected through a desulfurization wastewater conveying pipeline (202), and desulfurization wastewater is adjusted by the regulating tank (203) to have a pH value and then is back-sprayed into the wastewater evaporation tower (80) to be mixed with high-temperature flue gas, so that desulfurization wastewater is evaporated to dryness.
5. The anti-blocking system for high-temperature flue gas evaporation power plant wastewater as defined in claim 4, wherein the chemical adding device (100) comprises a set of chemical adding pipelines (102), and is connected to any one or more of the desulfurization wastewater storage tank (201), the adjusting tank (203) and the desulfurization wastewater conveying pipeline (202) through the chemical adding pipelines (102), so as to add a chemical agent for preventing caking into the desulfurization wastewater.
6. The anti-blocking system for power plant wastewater evaporated by high temperature flue gas according to claim 5, characterized in that when the chemical feeding line (102) of the chemical feeding device (100) is connected to the desulfurized wastewater storage tank (201) and/or the adjusting tank (203), a corresponding stirring device or an aeration device is arranged in the desulfurized wastewater storage tank (201) and/or the adjusting tank (203) for uniformly mixing the added chemical with the desulfurized wastewater.
7. The anti-blocking system for power plant wastewater evaporated by high temperature flue gas according to claim 5, wherein the chemical feeding pipeline (102) of the chemical feeding device (100) is connected with the desulfurization wastewater conveying pipeline (202) through a mixer (205), and the chemical and the desulfurization wastewater are uniformly mixed in the mixer (205) and then are fed into the wastewater evaporation tower (80) together to be mixed and evaporated with the high temperature flue gas.
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| CN113979501A (en) * | 2021-11-26 | 2022-01-28 | 南京诺克斯环保科技有限公司 | Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113979501A (en) * | 2021-11-26 | 2022-01-28 | 南京诺克斯环保科技有限公司 | Utilize high temperature flue gas evaporation power plant's waste water to prevent stifled system |
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