CN216513293U - Zero discharge system of terminal waste water of direct current cooling power plant - Google Patents
Zero discharge system of terminal waste water of direct current cooling power plant Download PDFInfo
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Abstract
The utility model provides a direct-current cooling power plant tail end wastewater zero discharge system, which comprises an integrated efficient reaction device, a tail end wastewater regulating tank and a bypass flue evaporation system, wherein the tail end wastewater regulating tank is connected with the integrated efficient reaction device; the integrated high-efficiency reaction device, the tail end wastewater regulating tank and the bypass flue evaporation system are sequentially connected. The system is highly integrated, adopts a steel structure, greatly saves the occupied area and the civil engineering cost, and has low construction and operation cost; the effect of removing suspended matters is good; the solid content of the inlet water of the desulfurization wastewater is about 5 percent, and the concentration of the suspended matters in the outlet water is stabilized below 100 mg/L; the floc formed by the compound medicament can be quickly concentrated in a settling zone, the risk of blockage of a pond overturning and an inclined pipe is avoided, and the treatment process is simple.
Description
Technical Field
The utility model relates to the field of water treatment, in particular to a zero-discharge system for tail-end wastewater of a direct-current cooling power plant.
Background
The thermal power plant is used as a large water-using and water-discharging household, the water consumption accounts for 20% of the total amount of industrial water, in order to save water resources and prevent water pollution, the environmental evaluation data of the thermal power plant clearly requires that the power plant is not provided with a discharge port, and the desulfurization wastewater of the whole plant realizes zero emission. The method can really realize zero emission of the thermal power plant, meet the requirements of environmental protection and environmental evaluation, not only require the thermal power plant to achieve zero emission of wastewater in the gradient application process of each level, but also realize the zero emission treatment of tail end wastewater such as chemical water concentrated water, fine treatment regeneration wastewater, desulfurization wastewater and the like, and bring a severe test for the zero emission treatment due to the particularity, complexity and strong corrosivity of the components of the tail end wastewater.
The tail end wastewater of the direct current cooling power plant mainly comprises high-concentration brine such as desulfurization wastewater, acid-base regeneration wastewater and the like, does not contain circulating cooling sewage, and has much smaller tail end wastewater amount than that of a circulating cooling power plant. The existing process for realizing zero discharge of tail end wastewater generally adopts a brine concentration evaporation and crystallization technology for advanced treatment, 95 percent of wastewater can be converted into high-purity distilled water, and the generated high-quality distilled water can be used for boiler water supplement, cooling tower water supplement, other industrial water and the like; the remaining 5% is a high concentration slurry which can be sent to a small solarization tank for evaporation or treated in a crystallizer or spray dryer into solid particles, and the final salt residue solids are generally treated as ordinary solid waste, which can be recycled or buried depending on their composition. The technology has the advantages of high equipment investment cost, high operating cost, high energy consumption and high ton water treatment cost, and the number of power plants adopting the technology to treat the desulfurization wastewater is rare all over the world, so the technology cannot be widely popularized.
Therefore, compared with a circulating cooling power plant, the direct-current cooling type power plant has the advantages that after cascade utilization, the tail end wastewater amount is small, zero emission is achieved by adopting a traditional wastewater concentration and crystallization evaporation system, the process flow is complex, and the construction and operation costs are high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to develop a tail end wastewater zero discharge system suitable for a direct-current cooling power plant, has the advantages of simple treatment process and low construction and operation cost, and realizes tail end wastewater zero discharge of the direct-current cooling power plant.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a direct current cooling power plant tail end wastewater zero discharge system comprises an integrated high-efficiency reaction device, a tail end wastewater regulating tank and a bypass flue evaporation system; the integrated high-efficiency reaction device, the tail end wastewater regulating tank and the bypass flue evaporation system are sequentially connected.
The tail end wastewater zero discharge system of the direct current cooling power plant is characterized in that the integrated efficient reaction device comprises a mixing reaction zone, a flocculation reaction zone and a precipitation zone which are sequentially connected.
The flocculation reaction zone is provided with a compound medicament adding system; the composite medicament is an integrated composite medicament for desulfurization wastewater, is a commercial product, and is directly added by dry powder; a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone, so that the effect of controlling the reaction speed gradient can be achieved; and the flow is pushed by the stirrer, so that a clockwise circulating flow field is formed in the flocculation reaction zone, and sludge sedimentation can be effectively prevented.
The flow guide device of the tail-end wastewater zero-discharge system of the direct-current cooling power plant is composed of a cylindrical flow guide cylinder, a flow stabilizing plate, a bottom apron plate and a foot plate.
The tail end wastewater zero-discharge system of the direct current cooling power plant comprises a generator set, a bypass flue evaporation tower, a flue gas system, a compressed air system and a concentrated water system; the bypass flue evaporation tower comprises an evaporation tower body, atomizing spray guns uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system is connected with the generator set, an SCR (selective catalytic reduction) outlet flue of the power plant and a bypass flue evaporation tower; the compressed air system and the concentrated water system are connected with the inlet of the atomizing spray gun.
The tail end wastewater zero-discharge system of the direct current cooling power plant comprises a flue gas system, a control system and a sealed air flue, wherein the flue gas system comprises an inlet flue, an outlet flue, an instrument control system and a sealed air flue; the compressed air system comprises an air compressor, an air pressure stabilizing tank and a compressed air distribution pipeline; the concentrated water system comprises a concentrated water distribution pipeline and a concentrated water pressure stabilizing pipe; the compressed air distribution pipeline and the concentrated water distribution pipeline are annularly arranged outside the bypass flue evaporation tower body, and the concentrated water pressure stabilizing pipe is arranged at a water inlet on the outer side of the bypass flue evaporation tower body; the automatic ash cleaning device comprises an ash bucket and a bin pump.
In the tail end wastewater zero discharge system of the direct current cooling power plant, the tower body of the bypass flue evaporation tower is also provided with a test rod and an online temperature sensor; the atomizing spray gun is a two-fluid atomizing spray gun; and an electric regulating valve is also arranged on the concentrated water distribution pipeline.
In the tail-end wastewater zero-discharge system of the direct-current cooling power plant, the inlet flue is provided with a flue gas electric flap valve, an inlet flue gas adjusting valve, an online flue gas flowmeter and an online temperature sensor; the outlet flue is provided with an outlet flue gas adjusting door and an online temperature sensor; the sealed air flue is provided with a flue gas regulating valve.
According to the direct-current cooling power plant tail end wastewater zero discharge system, the bypass flue evaporation system is connected with a pipeline between the low-temperature economizer and the air preheater in the power plant flue system.
The tail end wastewater zero discharge system of the direct-current cooling power plant is characterized in that a self-cleaning filter is further arranged between the tail end wastewater adjusting tank and the bypass flue evaporation system.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model discloses a zero discharge system for tail end wastewater of a direct-current cooling power plant. At present, zero discharge projects of a direct current cooling power plant run less, crystallization evaporation is performed after membrane concentration or thermal method concentration, evaporation is performed by a bypass flue or a main flue after concentration, and a waste water concentration section is inevitably needed for a circulation cooling type power plant due to large amount of circulation sewage. According to the utility model, after the water balance calculation of the power plant, the direct current cooling power plant can omit a concentration treatment working section, thereby not only saving energy consumption and medicine consumption, but also solving the problem that the strong brine scales to block the pipeline, and having the following advantages:
1) the effect of removing suspended matters is good; the solid content of the inlet water of the desulfurization wastewater is about 5 percent, and the concentration of suspended matters in the outlet water treated by the system is stabilized below 100 mg/L; the floc formed by the composite medicament has the characteristics of high specific gravity and rapid sedimentation, can be quickly concentrated in a sedimentation area, and does not have the risk of blockage of a pond turning and an inclined tube.
2) The adding types of the medicaments are few, and the dry adding mode is adopted for the compound medicaments, so that the workload of medicament configuration is reduced.
3) The whole treatment device is designed by steel, and the dosing, flocculation, reaction and precipitation devices are integrated into an integrated device. By adopting the integrated design, the operation is convenient, the occupied area can be greatly reduced, and the civil engineering cost is saved.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of a terminal wastewater zero-discharge system of a DC cooling power plant;
FIG. 2 is a schematic structural view of an integrated high-efficiency reactor;
FIG. 3 is a schematic diagram of a flue gas system and a bypass flue evaporation tower;
fig. 4 is an operation flow chart of the terminal wastewater zero discharge system of the direct current cooling power plant.
Wherein: 1-an integrated high-efficiency reaction device; 2-a tail end wastewater adjusting tank; 3-self-cleaning filter; 4-a bypass flue evaporation system; 5-low temperature economizer; 6-air preheater; 7-SCR; 11-a mixed reaction zone; 12-a flocculation reaction zone; 13-a precipitation zone; 14-a compound medicament dosing system; 15-a sewage pump; 16-a sludge dewatering system; 41-bypass flue evaporation tower; 411-an atomizing spray gun; 42-flue gas system; 421-inlet flue; 422-outlet flue; 423-sealing the air flue; 43-compressed air system; 431-air compressor; 432-air surge tank; 433-a compressed air distribution pipeline; 44-concentrated water system; 441-concentrated water distribution pipeline; 442-concentrated water pressure stabilizing tube; 45-bin pump.
Detailed Description
comprises an integrated high-efficiency reaction device 1, a tail end wastewater regulating tank 2, a self-cleaning filter 3 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2, the self-cleaning filter 3 and the bypass flue evaporation system 4 are sequentially connected; the bypass flue evaporation system 4 is connected with a pipeline between the low-temperature economizer 5 and the air preheater 6 in the flue system of the power plant;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence;
a compound medicament adding system 14 is arranged on the flocculation reaction zone 12; a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone 12; the flow guide device consists of a cylindrical flow guide cylinder, a flow stabilizing plate, a bottom apron plate and a foot plate;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411; the atomizing spray gun 411 is a two-fluid atomizing spray gun;
the flue gas system 42 comprises an inlet flue 421, an outlet flue 422, an instrument control system and a sealed air flue 423; the compressed air system 43 comprises an air compressor 431, an air surge tank 432 and a compressed air distribution pipeline 433; the concentrated water system 44 comprises a concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442; the compressed air distribution pipeline 433 and the concentrated water distribution pipeline 441 are annularly arranged outside the tower body of the bypass flue evaporation tower 41, and the concentrated water pressure stabilizing pipe 442 is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower 41; the automatic ash removal device comprises an ash bucket and a bin pump 45;
the tower body of the bypass flue evaporation tower 41 is also provided with a test rod and an online temperature sensor; an electric regulating valve is further arranged on the concentrated water distribution pipeline 441;
the inlet flue 421 is provided with a flue gas electric flap gate, an inlet flue gas adjusting gate, an online flue gas flowmeter and an online temperature sensor; the outlet flue 422 is provided with an outlet flue gas adjusting door and an online temperature sensor; the sealed air flue 423 is provided with a smoke regulating valve.
Example 2: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence.
Example 3: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence;
a compound medicament adding system 14 is arranged on the flocculation reaction zone 12; a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone 12.
Example 4: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence;
a compound medicament adding system 14 is arranged on the flocculation reaction zone 12; a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone 12;
the flow guide device consists of a cylindrical flow guide cylinder, a flow stabilizing plate, a bottom apron plate and a foot plate.
Example 5: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411.
Example 6: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411;
the flue gas system 42 comprises an inlet flue 421, an outlet flue 422, an instrument control system and a sealed air flue 423; the compressed air system 43 comprises an air compressor 431, an air surge tank 432 and a compressed air distribution pipeline 433; the concentrated water system 44 comprises a concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442; the compressed air distribution pipeline 433 and the concentrated water distribution pipeline 441 are annularly arranged outside the tower body of the bypass flue evaporation tower 41, and the concentrated water pressure stabilizing pipe 442 is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower 41; the automatic ash removal device comprises an ash bucket and a bin pump 45.
Example 7: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411; the atomizing spray gun 411 is a two-fluid atomizing spray gun;
the flue gas system 42 comprises an inlet flue 421, an outlet flue 422, an instrument control system and a sealed air flue 423; the compressed air system 43 comprises an air compressor 431, an air surge tank 432 and a compressed air distribution pipeline 433; the concentrated water system 44 comprises a concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442; the compressed air distribution pipeline 433 and the concentrated water distribution pipeline 441 are annularly arranged outside the tower body of the bypass flue evaporation tower 41, and the concentrated water pressure stabilizing pipe 442 is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower 41; the automatic ash removal device comprises an ash bucket and a bin pump 45;
the tower body of the bypass flue evaporation tower 41 is also provided with a test rod and an online temperature sensor; an electric regulating valve is further arranged on the concentrated water distribution pipeline 441.
Example 8: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411;
the flue gas system 42 comprises an inlet flue 421, an outlet flue 422, an instrument control system and a sealed air flue 423; the compressed air system 43 comprises an air compressor 431, an air surge tank 432 and a compressed air distribution pipeline 433; the concentrated water system 44 comprises a concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442; the compressed air distribution pipeline 433 and the concentrated water distribution pipeline 441 are annularly arranged outside the tower body of the bypass flue evaporation tower 41, and the concentrated water pressure stabilizing pipe 442 is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower 41; the automatic ash removal device comprises an ash bucket and a bin pump 45;
the inlet flue 421 is provided with a flue gas electric flap gate, an inlet flue gas adjusting gate, an online flue gas flowmeter and an online temperature sensor; the outlet flue 422 is provided with an outlet flue gas adjusting door and an online temperature sensor; the sealed air flue 423 is provided with a smoke regulating valve.
Example 9: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater adjusting tank 2 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2 and the bypass flue evaporation system 4 are sequentially connected; the bypass flue evaporation system 4 is connected with a pipeline between the low-temperature economizer 5 and the air preheater 6 in the flue system of the power plant.
Example 10: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater regulating tank 2, a self-cleaning filter 3 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2, the self-cleaning filter 3 and the bypass flue evaporation system 4 are sequentially connected;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence.
Example 11: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater regulating tank 2, a self-cleaning filter 3 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2, the self-cleaning filter 3 and the bypass flue evaporation system 4 are sequentially connected;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411.
Example 12: a zero discharge system of tail end waste water of a direct current cooling power plant:
comprises an integrated high-efficiency reaction device 1, a tail end wastewater regulating tank 2, a self-cleaning filter 3 and a bypass flue evaporation system 4; the integrated high-efficiency reaction device 1, the tail end wastewater regulating tank 2, the self-cleaning filter 3 and the bypass flue evaporation system 4 are sequentially connected; the bypass flue evaporation system 4 is connected with a pipeline between the low-temperature economizer 5 and the air preheater 6 in the power plant flue system;
the integrated high-efficiency reaction device 1 comprises a mixing reaction zone 11, a flocculation reaction zone 12 and a precipitation zone 13 which are connected in sequence;
a compound medicament adding system 14 is arranged on the flocculation reaction zone 12; a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone 12;
the bypass flue evaporation system 4 comprises a generator set, a bypass flue evaporation tower 41, a flue gas system 42, a compressed air system 43 and a concentrated water system 44; the bypass flue evaporation tower 41 comprises an evaporation tower body, atomizing spray guns 411 uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system 42 is connected with the generator set, an SCR7 outlet flue of the power plant and the bypass flue evaporation tower 41; the compressed air system 43 and the concentrated water system 44 are connected with the inlet of the atomizing spray gun 411;
the flue gas system 42 comprises an inlet flue 421, an outlet flue 422, an instrument control system and a sealed air flue 423; the compressed air system 43 comprises an air compressor 431, an air surge tank 432 and a compressed air distribution pipeline 433; the concentrated water system 44 comprises a concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442; the compressed air distribution pipeline 433 and the concentrated water distribution pipeline 441 are annularly arranged outside the tower body of the bypass flue evaporation tower 41, and the concentrated water pressure stabilizing pipe 442 is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower 41; the automatic ash removal device comprises an ash bucket and a bin pump 45.
The working principle of embodiment 1 of the utility model is as follows:
the desulfurization wastewater enters a mixing reaction zone 11 of the integrated high-efficiency reaction device 1, liquid alkali is added to adjust the pH value, then the desulfurization wastewater enters a flocculation reaction zone 12, the desulfurization wastewater is mixed with a composite medicament added by a composite medicament adding system 14 and is stirred and reacted by a high-shear stirrer, suspended matters and heavy metal ions in the wastewater are removed, the wastewater after reaction enters a settling zone 13 for mud-water separation, sludge enters a sludge dewatering system 16 through a bottom sewage pump 15, and supernatant enters a clear water tank through a water collecting tank; the effluent of the clean water tank and the tail end wastewater of the direct current cooling power plant except the desulfurization wastewater are mixed and then enter a tail end wastewater adjusting tank 2 to stay for homogenization and uniform amount, then the turbidity is removed by a self-cleaning filter 3, the water amount of the wastewater after the turbidity removal is uniformly distributed by an annular concentrated water distribution pipeline 441 and a concentrated water pressure stabilizing pipe 442 to enter an atomizing spray gun 411, compressed air is uniformly distributed by an air pressure stabilizing tank 432 and a compressed air distribution pipeline 433 to enter an atomizing spray gun 411, the wastewater and the compressed air are mixed to form a double-fluid structure of 'water in air', the wastewater and the compressed air are atomized by the spray gun into small fog drops to be sprayed into a bypass flue evaporation tower 41, the evaporation tower introduces dry flue gas at 350 ℃ from an outlet flue of an SCR7 through an inlet flue 421, the fog drops and the flue gas are subjected to heat transfer, mass transfer and evaporation, crystal salt formed after evaporation and water vapor are merged into a flue between an air preheater 6 and a low-temperature coal economizer 5 along with the flue gas, and the crystal salt is captured and removed in a dust remover, the vapor enters the desulfurization system to be condensed into water to supplement the water for the desulfurization system, and the residual ash formed at the bottom of the tower is conveyed to the ash storehouse through the bin pump 45.
Claims (10)
1. The utility model provides a terminal waste water zero release system of direct current cooling power plant which characterized in that: comprises an integrated high-efficiency reaction device (1), a tail end wastewater adjusting tank (2) and a bypass flue evaporation system (4); the integrated efficient reaction device (1), the tail end wastewater adjusting tank (2) and the bypass flue evaporation system (4) are sequentially connected.
2. The direct current cooling power plant terminal wastewater zero discharge system of claim 1, characterized in that: the integrated efficient reaction device (1) comprises a mixed reaction zone (11), a flocculation reaction zone (12) and a precipitation zone (13) which are connected in sequence.
3. The direct current cooling power plant terminal wastewater zero discharge system of claim 2, characterized in that: a compound medicament adding system (14) is arranged on the flocculation reaction zone (12); and a high-shear stirrer and a flow guide device are arranged in the flocculation reaction zone (12).
4. The direct current cooling power plant terminal wastewater zero discharge system of claim 3, characterized in that: the flow guide device consists of a cylindrical flow guide cylinder, a flow stabilizing plate, a bottom apron plate and a foot plate.
5. The direct current cooling power plant terminal wastewater zero discharge system of claim 1, characterized in that: the bypass flue evaporation system (4) comprises a generator set, a bypass flue evaporation tower (41), a flue gas system (42), a compressed air system (43) and a concentrated water system (44); the bypass flue evaporation tower (41) comprises an evaporation tower body, atomizing spray guns (411) uniformly distributed in the tower and an automatic ash removal device arranged at the bottom of the tower; the flue gas system (42) is connected with the generator set, an SCR (7) outlet flue of the power plant and a bypass flue evaporation tower (41); the compressed air system (43) and the concentrated water system (44) are connected with the inlet of the atomizing spray gun (411).
6. The direct current cooling power plant terminal wastewater zero discharge system of claim 5, characterized in that: the flue gas system (42) comprises an inlet flue (421), an outlet flue (422), an instrument control system and a sealing air flue (423); the compressed air system (43) comprises an air compressor (431), an air surge tank (432) and a compressed air distribution pipeline (433); the concentrated water system (44) comprises a concentrated water distribution pipeline (441) and a concentrated water pressure stabilizing pipe (442); the compressed air distribution pipeline (433) and the concentrated water distribution pipeline (441) are annularly arranged on the outer side of the tower body of the bypass flue evaporation tower (41), and the concentrated water pressure stabilizing pipe (442) is arranged at a water inlet on the outer side of the tower body of the bypass flue evaporation tower (41); the automatic ash removal device comprises an ash bucket and a bin pump (45).
7. The direct current cooling power plant terminal wastewater zero discharge system of claim 6, characterized in that: the tower body of the bypass flue evaporation tower (41) is also provided with a test rod and an online temperature sensor; the atomizing spray gun (411) is a two-fluid atomizing spray gun; and an electric regulating valve is also arranged on the concentrated water distribution pipeline (441).
8. The direct current cooling power plant terminal wastewater zero discharge system of claim 6, characterized in that: the inlet flue (421) is provided with a flue gas electric flap valve, an inlet flue gas adjusting valve, an online flue gas flowmeter and an online temperature sensor; the outlet flue (422) is provided with an outlet flue gas adjusting door and an online temperature sensor; the sealed air flue (423) is provided with a smoke regulating valve.
9. The direct current cooling power plant terminal wastewater zero discharge system of claim 1, characterized in that: and the bypass flue evaporation system (4) is connected with a low-temperature economizer (5) and an air preheater in a power plant flue system through pipelines.
10. The direct current cooling power plant terminal wastewater zero discharge system according to claim 2 or 5, characterized in that: and a self-cleaning filter (3) is also arranged between the tail end wastewater regulating tank (2) and the bypass flue evaporation system (4).
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| CN202122501706.4U CN216513293U (en) | 2021-10-18 | 2021-10-18 | Zero discharge system of terminal waste water of direct current cooling power plant |
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