CN216191202U - Salt-containing wastewater zero-emission bypass flue evaporation system utilizing flue gas waste heat of power plant - Google Patents
Salt-containing wastewater zero-emission bypass flue evaporation system utilizing flue gas waste heat of power plant Download PDFInfo
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- CN216191202U CN216191202U CN202120796864.4U CN202120796864U CN216191202U CN 216191202 U CN216191202 U CN 216191202U CN 202120796864 U CN202120796864 U CN 202120796864U CN 216191202 U CN216191202 U CN 216191202U
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Abstract
The utility model discloses a saliferous waste water zero-emission bypass flue evaporation system utilizing waste heat of flue gas of a power plant, which comprises a coal-fired boiler, a main flue, an A-side denitration device, a B-side denitration device, an A-side air preheater, a B-side air preheater, an A-side dust remover, a B-side dust remover, an A-side induced draft fan, a B-side induced draft fan, an evaporation tower and an ash conveying device, wherein the A-side denitration device, the A-side air preheater, the A-side dust remover and the A-side induced draft fan are sequentially connected through one main flue, and the B-side denitration device, the B-side air preheater, the B-side dust remover and the B-side induced draft fan are sequentially connected through the other main flue. The salt-containing wastewater zero-discharge bypass flue evaporation system utilizing the waste heat of the flue gas of the power plant solves the problems of pipeline blockage, equipment corrosion, uneven main flue gas distribution and scaling of the barrel wall of an evaporation tower caused by the treatment of complex high-salt-containing wastewater which is not pretreated in the traditional bypass flue evaporation system.
Description
Technical Field
The utility model relates to the technical field of power plant flue gas treatment, in particular to a salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of power plant flue gas.
Background
In a thermal power plant constructed in 2005, water resource demonstration and environmental impact evaluation were designed according to the requirement of 'zero discharge' of wastewater from the power plant, a plant area was not provided with wastewater discharge ports, wastewater centralized treatment was carried out in the power plant, the treated wastewater was recycled, and wastewater discharge was prohibited under normal operating conditions.
The technical regulation for wastewater treatment design of thermal power plants issued in 2006 is clearly proposed: the desulfurization wastewater treatment facility of the thermal power plant needs to be independently arranged, treatment and recycling are preferentially considered, no discharge port is arranged, and zero discharge of wastewater must be realized.
In order to realize zero discharge of the high-salt-content wastewater at the tail end of the thermal power plant, the utility model provides a zero-salt-content wastewater zero-discharge bypass flue evaporation system utilizing the waste heat of the flue gas of the power plant.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a salt-containing wastewater zero-emission bypass flue evaporation system utilizing the waste heat of flue gas of a power plant, which can effectively solve the problems in the background art.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides an utilize waste heat of power plant's flue gas's zero release bypass flue evaporation system that contains salt waste water, it includes coal fired boiler, flue, A side denitrification facility, B side denitrification facility, A side air heater, B side air heater, A side dust remover, B side dust remover, A side draught fan, B side draught fan, evaporating tower and defeated ash device, A side denitrification facility, A side air heater, A side dust remover, A side draught fan loop through a flue and connect, B side denitrification facility, B side air heater, B side dust remover, B side draught fan loop through another flue and connect.
Preferably, the evaporation tower is fixedly connected with an evaporation tower outlet main flue, an evaporation tower inlet main flue, an evaporation tower branch flue A side and an evaporation tower branch flue B side, the evaporation tower branch flue A side is respectively connected with a main flue between an A side denitration device and an A side air preheater and a main flue between an A side air preheater and an A side dust remover, and the evaporation tower branch flue B side is respectively connected with a main flue between a B side denitration device and a B side air preheater and a main flue between a B side air preheater and a B side dust remover.
Preferably, the evaporation tower is connected with a tail end high-salt-content wastewater delivery pump, a rotary atomizer is arranged in the evaporation tower, and the tail end high-salt-content wastewater is subjected to evaporation treatment in the evaporation tower after being treated by the rotary atomizer.
Preferably, the inlet of the tail end high-salt-content wastewater delivery pump is connected with an electric valve through a pipeline, and the electric valve delivers process water to the tail end high-salt-content welding fume wastewater delivery pump.
Preferably, an electric inserting plate door is connected between the inlet of the side A air preheater and the inlet of the side B air preheater and the evaporation tower through a flue.
Preferably, the ash conveying device is connected with the bottom of the evaporation tower, and the outlet end of the ash conveying device is connected with the ash warehouse.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model conveys the process water to the inlet of the tail end wastewater conveying pump through the pipeline and the electric valve, and automatically washes the on-the-way equipment and the pipeline by using the tail end wastewater conveying pump, thereby having convenient operation, saving cost and not needing to be provided with a washing water pump independently.
The flue gas is extracted from the main flues at the two sides from the denitration outlet to the inlet of the air preheater, and the evaporated flue gas is discharged into the main flues at the two sides from the outlet of the air preheater to the inlet of the dust remover, so that the flow field of the whole main flue is uniformly distributed after the flue gas is extracted, and the safe and reliable operation of the system is ensured.
The ash conveying device can convey the accumulated ash in the conical hopper to the ash storage in time in a pneumatic ash conveying mode, and the phenomenon that the operation of the whole system is influenced due to excessive accumulated ash at the bottom of the evaporation tower is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a salt-containing wastewater zero-discharge bypass flue evaporation system utilizing flue gas waste heat of a power plant.
In the figure: 1. a coal-fired boiler 1; 2, an A side denitration device; 3. a main flue; 4, a side air preheater; 5, a side A dust remover; 6, a side A induced draft fan; a B-side dust remover; 9, an inlet flue of the B-side dust remover; 10, an inlet flue of the A-side dust remover; a B-side air preheater; 12. a branch flue B side of the evaporation tower; 13. a branch flue A side of the evaporation tower; a B-side denitration device; 15. an electrically operated valve; 16. electrically adjusting the flapper door; 17. an evaporation tower outlet main flue; 18. process water; 19. a tail end wastewater delivery pump; 20. an evaporation tower inlet main flue; rotating the atomizer; 22. an evaporation tower; 23. an electrically-powered gate; 24. the air preheater heats the primary air; 25. an ash conveying device.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, an utilize waste heat of power plant's flue gas's zero release bypass flue evaporation system that contains salt waste water, it includes coal fired boiler 1, flue 3, a side denitrification facility 2, B side denitrification facility 14, A side air heater 4, B side air heater 11, A side dust remover 5, B side dust remover 8, A side draught fan 6, B side draught fan 7, evaporating tower 22 and defeated ash device 25, A side denitrification facility 2, A side air heater 4, A side dust remover 5, A side draught fan 6 loop through a flue 3 and connect, B side denitrification facility 14, B side air heater 11, B side dust remover 8, B side draught fan 7 loop through another flue 3 and connect.
The evaporation tower 22 is fixedly connected with an evaporation tower outlet main flue 173, an evaporation tower inlet main flue 203, an evaporation tower branch flue A side 13 and an evaporation tower branch flue B side 12, the evaporation tower branch flue A side 13 is respectively connected with a main flue 3 connected with an A side denitration device 2, an A side air preheater 4 and an A side dust remover 5, and the evaporation tower branch flue B side 12 is connected with a main flue 3 connected with a B side denitration device 14, a B side air preheater 11 and a B side dust remover 8.
During actual work, if smoke is extracted from the single-side main flue 3, the air leakage rate of the flue on one side is large, so that the temperature difference of the smoke on two sides of the flue is increased, the smoke temperature center is inclined, the flow rate of the smoke is uneven, the two sides of the air preheater are heated unevenly, and the temperature difference between the two sides is increased; moreover, if the flue gas is extracted from the single-side main flue 3, the resistance of the flue gas and air systems on two sides is different, so that the pressure fluctuation of the boiler furnace is possibly large. Therefore, the flue gas is extracted from the denitration outlet to the main flues 3 at the two sides of the inlet of the air preheater, and the evaporated flue gas is discharged into the main flues 3 at the two sides of the outlet of the air preheater to the inlet of the dust remover, so that the flow field of the whole flue is uniformly distributed after the flue gas is extracted, and the safe and reliable operation of the system is ensured.
The evaporation tower 22 is connected with the terminal high salt waste water delivery pump that contains, be provided with rotary atomizer 21 in the evaporation tower 22, the terminal high salt waste water carries out the evaporation treatment in evaporation tower 22 after handling through rotary atomizer 21.
Wherein, the waste water of terminal high salt waste water treatment not only includes desulfurization waste water, still include the concentrated water of acid-base regeneration waste water, circulating water blowdown water and one or several kinds of waste water, and no matter not through the concentration or the waste water after the high-power concentration can not be through the preliminary treatment, carry out evaporation treatment in evaporating tower 22 after rotatory atomizer 21 atomizes, the terminal high salt waste water that terminal waste water delivery pump 19 carried in addition, its quality of water is more complicated, salt content and solid content are higher, the system stops the back, remain terminal high salt waste water in journey pipeline, terminal waste water delivery pump 19 and rotatory atomizer 21, if not in time wash along journey equipment and pipeline, remaining terminal high salt waste water easily causes the jam and the corruption of along journey equipment and pipeline because of the precipitation of deposit and salinity. Therefore, the process water 18 is conveyed to the inlet of the tail end waste water conveying pump 19 through the pipeline and the electric valve 15, the tail end waste water conveying pump 19 is used for automatically washing the on-way equipment and the pipeline, the operation is convenient, the cost can be saved, and a washing water pump does not need to be arranged independently.
And an electric inserting plate door 23 is connected between the A-side air preheater 4 and the B-side air preheater 11 and the evaporation tower 22 through flues. A small amount of hot air is led to the barrel wall of the evaporation tower 22 from an outlet pipeline of hot primary air 24 of the air preheater, the barrel wall of the evaporation tower 22 is arranged in a laminated mode, the hot primary air enters the evaporation tower 22 through the laminated gap of the barrel wall, the barrel wall of the evaporation tower 22 is swept by the led-in hot primary air, and the problems that the barrel wall of the evaporation tower 22 is blocked and the load is increased due to the fact that fly ash is enriched or waste water at the barrel wall is scaled due to incomplete evaporation are solved. Moreover, when the treatment capacity of the waste water with high salt content at the tail end is lower than the design value of the system, because the treatment capacity is small, the sprayed liquid drops are far away from the barrel wall of the evaporation tower 22, at the moment, the electric flashboard door 23 can be closed, the hot primary air is isolated from the evaporation tower 22, and the use amount of the hot primary air is reduced.
The ash conveying device 25 is connected with the bottom of the evaporation tower 22, the outlet end of the ash conveying device 25 is connected with the ash warehouse, the ash conveying device 25 can convey the accumulated ash in the conical hopper to the ash warehouse in time in a pneumatic ash conveying mode, and the phenomenon that the operation of the whole system is influenced due to excessive ash accumulation at the bottom of the evaporation tower 22 is avoided
The utility model relates to a salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of flue gas of a power plant, which sequentially comprises a coal-fired boiler 1, a flue, a denitration device, a flue, an air preheater, a flue and a dust remover; in addition, an inlet flue, an evaporation tower 22, an outlet flue, a jet pump, a waste water conveying pipeline and an ash conveying device 25 are arranged in a bypass mode. The system flow is as follows: a small amount of high-temperature flue gas is led out from two sides of a flue to a spray evaporation system after an SCR denitration device and before an air preheater; the outlet and the inlet of the spray evaporation system are isolated from the main flue through an electric isolation baffle; an electric adjusting baffle is additionally arranged at the inlet of the evaporator to adjust the flow and the flow speed of the flue gas (or a booster fan is additionally arranged); a rotary sprayer is arranged in the evaporator, and the atomized liquid drops and the introduced high-temperature flue gas carry out rapid mass and heat transfer to realize the efficient evaporation of the liquid drops; the atomized liquid drops are lifted to an atomization system for atomization through a tail end wastewater delivery pump 19, the pressure of a variable frequency control delivery pipeline of the wastewater pump is controlled, the flow is regulated through a regulating valve on an evaporator inlet pipeline, and an automatic flushing device is arranged on the tail end high-salt-content wastewater delivery pipeline. The outlet of the bypass flue is connected with the flue behind the air preheater and in front of the dust remover, and the evaporated crystals enter the dust remover along with the flue gas and are captured and collected; in addition, a small amount of hot air is led to the barrel wall of the evaporation tower 22 from an outlet pipeline of hot primary air 24 of the air preheater, the barrel wall of the evaporation tower 22 is arranged in a laminated mode, the hot primary air enters the inner part 22 of the evaporation tower through a barrel wall gap, the introduced hot air is used for sweeping the barrel wall of the evaporation tower 22, and system blockage and load aggravation caused by dust enrichment of the barrel wall of the evaporation tower 22 or scaling of waste water at the barrel wall due to incomplete evaporation are prevented. The problem of pipeline jam and equipment corrosion, 3 flue gas maldistributions of flue main flue and 22 barrel walls scale deposit of evaporating tower that arouse when the high salt waste water that does not contain the preliminary treatment of processing complicacy among the traditional bypass flue evaporation system has been solved to this patent to make bypass flue evaporation system can long-term stable operation.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an utilize waste heat of power plant's flue gas's salt waste water zero release bypass flue evaporation system that contains, its characterized in that, it includes coal fired boiler, flue header, A side denitrification facility, B side denitrification facility, A side air heater, B side air heater, A side dust remover, B side dust remover, A side draught fan, B side draught fan, evaporating tower and defeated ash device, A side denitrification facility, A side air heater, A side dust remover, A side draught fan loop through a flue header and connect, B side denitrification facility, B side air heater, B side dust remover, B side draught fan loop through another flue header and connect.
2. The salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of power plant flue gas as claimed in claim 1, characterized in that: the side A of the branch flue of the evaporation tower is respectively connected with a main flue between a denitration device at the side A and an air preheater at the side A and a main flue between an air preheater at the side A and a dust remover at the side A, and the side B of the branch flue of the evaporation tower is respectively connected with a main flue between a denitration device at the side B and an air preheater at the side B and a main flue between an air preheater at the side B and a dust remover at the side B.
3. The salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of power plant flue gas as claimed in claim 1, characterized in that: the evaporation tower is connected with a tail end high salt-containing wastewater delivery pump, a rotary atomizer is arranged in the evaporation tower, and the tail end high salt-containing wastewater is subjected to evaporation treatment in the evaporation tower after being treated by the rotary atomizer.
4. The power plant flue gas waste heat-utilizing salt-containing wastewater zero-emission bypass flue evaporation system of claim 3, characterized in that: the inlet of the tail end high-salt-content wastewater conveying pump is connected with an electric valve through a pipeline, and the electric valve conveys process water to the tail end high-salt-content wastewater conveying pump.
5. The salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of power plant flue gas as claimed in claim 1, characterized in that: and an inlet of the air preheater at the side A and an inlet of the air preheater at the side B are connected with the evaporation tower through a flue, and an electric inserting plate door is connected between the inlet of the air preheater at the side A and the inlet of the air preheater at the side B and the evaporation tower.
6. The salt-containing wastewater zero-emission bypass flue evaporation system utilizing waste heat of power plant flue gas as claimed in claim 1, characterized in that: the ash conveying device is connected with the bottom of the evaporation tower, and the outlet end of the ash conveying device is connected with the ash warehouse.
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| CN202120796864.4U CN216191202U (en) | 2021-04-19 | 2021-04-19 | Salt-containing wastewater zero-emission bypass flue evaporation system utilizing flue gas waste heat of power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956239A (en) * | 2022-06-21 | 2022-08-30 | 国家电投集团重庆合川发电有限公司 | Desulfurization wastewater treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956239A (en) * | 2022-06-21 | 2022-08-30 | 国家电投集团重庆合川发电有限公司 | Desulfurization wastewater treatment device |
| CN114956239B (en) * | 2022-06-21 | 2024-01-26 | 国家电投集团重庆合川发电有限公司 | Desulfurization waste water treatment device |
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