Desulfurization wastewater coupling treatment device

Abstract

The utility model discloses a desulfurization wastewater coupling treatment device. The device comprises an indirect air cooling tower, a concentration reduction section is arranged at the bottom end in the indirect air cooling tower, the concentration reduction section comprises a wastewater buffer pool arranged at the bottom end in the indirect air cooling tower, and an evaporation concentration tower is arranged above the wastewater buffer pool; the indirect air cooling tower further comprises a desulfurization wastewater circulating pump and a concentrated water conveying pump, the water suction end of the desulfurization wastewater circulating pump is located in the wastewater buffer pool, the water outlet end of the desulfurization wastewater circulating pump is communicated with a circulating water pipe, and the water outlet end of the circulating water pipe is communicated to the upper part of the evaporation concentration tower; the water suction end of the concentrated water delivery pump is positioned in the wastewater buffer pool, and the water outlet end of the concentrated water delivery pump is communicated with a delivery pipeline; and the water outlet end of the conveying pipeline is communicated with an evaporative crystallization section positioned beside a boiler of the thermal power plant. According to the utility model, waste heat is fully utilized, energy is saved, the load impact resistance is improved, and resource utilization of desulfurization waste water and zero discharge of waste water are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plant process, in particular to a desulfurization wastewater coupling treatment device. Background Art

[0002] As environmental protection becomes increasingly stringent, zero discharge of wastewater from thermal power plants has become a basic requirement. Desulfurization wastewater is the terminal drainage of the cascade utilization of wastewater from power plants. Due to its high salt content, excessive pollutants, and strong corrosiveness, it has become a constraint factor in the zero discharge of wastewater from power plants.

[0003] The existing desulfurization wastewater treatment processes include membrane concentration, thermal concentration, and flue gas concentration. However, these treatment processes have the disadvantages of high investment cost, high operating energy consumption, weak load impact resistance, and unstable operation. Summary of the invention

[0004] In view of the shortcomings of the existing technology, the utility model proposes a desulfurization wastewater coupling treatment device to form a new process that meets the requirements of deep treatment of desulfurization wastewater. It not only has low investment cost, makes full use of waste heat and saves energy, but also improves the ability to resist load impact, ensures that there is no wastewater discharged from the process system, and achieves true zero emission.

[0005] In order to achieve the above-mentioned purpose, the utility model is designed to be a desulfurization wastewater coupling treatment device, including an indirect air cooling tower located next to the condenser of a thermal power plant, and its special features are:

[0006] The bottom of the indirect air-cooling tower is provided with a concentration reduction section for concentrating the desulfurized wastewater, and the concentration reduction section includes a wastewater buffer tank arranged at the bottom of the indirect air-cooling tower, and an evaporation concentration tower is arranged above the wastewater buffer tank; the indirect air-cooling tower also includes a desulfurized wastewater circulation pump and a concentrated water delivery pump, the water suction end of the desulfurized wastewater circulation pump is located in the wastewater buffer tank, the water outlet end of the desulfurized wastewater circulation pump is connected to a circulating water pipe, and the water outlet end of the circulating water pipe is connected to the upper part of the evaporation concentration tower; the water suction end of the concentrated water delivery pump is located in the wastewater buffer tank, and the water outlet end of the concentrated water delivery pump is connected to a delivery pipeline;

[0007] The water outlet end of the conveying pipeline is connected to an evaporation crystallization section located next to the boiler of the thermal power plant. The evaporation crystallization section includes an evaporation drying tower. The top of the evaporation drying tower is provided with a rotary atomizer connected to the water outlet end of the conveying pipeline. The top of the evaporation drying tower is connected to a high-temperature flue from the inlet of an air preheater. The lower part of the evaporation drying tower is connected to a low-temperature flue that merges into the inlet of a dust collector. The bottom end of the evaporation drying tower is connected to a silo pump for dropping accumulated ash.

[0008] Furthermore, the wastewater buffer tank is arranged at the bottom center of the indirect air-cooling tower, and the wastewater buffer tank is an underground open reinforced concrete tank.

[0009] Furthermore, the inner wall of the wastewater buffer tank is paved with glass fiber reinforced plastic for corrosion prevention, and the outer wall is paved with epoxy asphalt for corrosion prevention.

[0010] Furthermore, the evaporation concentration tower is an assembled all-glass fiber reinforced plastic tower.

[0011] Furthermore, the desulfurization wastewater circulation pump and the concentrated water delivery pump are horizontal self-priming pumps made of duplex steel.

[0012] Furthermore, the upper part of the evaporative drying tower is a cylinder, and the lower part is a conical cylinder. The cylinder body and supporting columns of the evaporative drying tower are both steel structures, and the cylinder lining is paved with corrosion-resistant materials.

[0013] Furthermore, the evaporation drying tower is an airtight structure for preventing leakage of smoke and wastewater droplets.

[0014] Furthermore, the desulfurization wastewater circulation pump and the concentrated water delivery pump are arranged beside the wastewater buffer tank.

[0015] Furthermore, the circulating water pipe and the conveying pipeline are respectively steel skeleton composite pipes.

[0016] The advantages of the utility model are:

[0017] 1. The utility model firstly utilizes the waste heat in the indirect air cooling tower to continuously evaporate and concentrate the desulfurized wastewater, and then transports the concentrated desulfurized wastewater to the evaporation crystallization section next to the boiler. The concentrated desulfurized wastewater enters the rotary atomizer for atomization spraying, and the high-temperature flue gas from the inlet of the air preheater enters the evaporation drying tower through the high-temperature flue, and fully contacts with the fine wastewater droplets atomized by the rotary atomizer, so that the water in the droplets evaporates rapidly, and the salts in the wastewater are dried and precipitated, mixed into the dust of the original flue gas, and finally merged into the inlet flue of the dust collector of the thermal power plant through the low-temperature flue;

[0018] 2. The utility model not only utilizes the waste heat in the indirect air cooling tower to evaporate and concentrate the desulfurization wastewater, but also utilizes the high-temperature flue gas to crystallize the atomized fine wastewater droplets. The entire wastewater treatment process fully utilizes the waste heat and saves energy.

[0019] 3. The utility model sets a large-capacity wastewater buffer tank at the bottom of the indirect air-cooling tower to store desulfurization wastewater, regulate the system, and improve the load impact resistance; at the same time, the wastewater buffer tank serves as the evaporation concentration tower water collection tank and evaporation tank. The large-area wastewater buffer tank can increase the contact area between the wastewater and the hot air in the indirect air-cooling tower, thereby increasing the evaporation capacity;

[0020] 4. The utility model does not need to add medicine during operation, and the operating cost is low;

[0021] The utility model desulfurization wastewater coupling treatment device not only has low investment cost, fully utilizes waste heat, saves energy, but also improves load impact resistance, realizes desulfurization wastewater resource utilization and wastewater zero discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the desulfurization wastewater coupling treatment device of the utility model;

[0023] In the figure: indirect air cooling tower 1, concentration and reduction section 2, evaporation and crystallization section 3;

[0024] The concentration and reduction section 2 includes: a wastewater buffer tank 21, an evaporation concentration tower 22, a desulfurization wastewater circulation pump 23, a circulating water pipe 24, a concentrated water delivery pump 25, and a delivery pipeline 26;

[0025] The evaporation crystallization section 3 includes: an evaporation drying tower 31 , a rotary atomizer 32 , a high-temperature flue 33 , a low-temperature flue 34 , and a silo pump 35 . DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0027] like Figure 1 As shown, the utility model desulfurization wastewater coupling treatment device includes an indirect air cooling tower 1 located next to the condenser of the thermal power plant. The waste heat of the condenser of the thermal power plant is discharged into the atmosphere through the indirect air cooling tower 1. The indirect air cooling tower 1 has a high temperature and low humidity environment, which is suitable for evaporation and concentration of desulfurization wastewater.

[0028] A concentration and reduction section 2 for concentrating desulfurized wastewater is provided at the bottom of the indirect air-cooling tower 1. The concentration and reduction section 2 includes a wastewater buffer tank 21 provided at the bottom of the indirect air-cooling tower 1, and an evaporation and concentration tower 22 is provided above the wastewater buffer tank 21; the indirect air-cooling tower 1 also includes a desulfurized wastewater circulating pump 23 and a concentrated water delivery pump 25, the water suction end of the desulfurized wastewater circulating pump 23 is located in the wastewater buffer tank 21, and the water outlet end of the desulfurized wastewater circulating pump 23 is connected to a circulating water pipe 24, and the water outlet end of the circulating water pipe 24 is connected to the upper part of the evaporation and concentration tower 22; the water suction end of the concentrated water delivery pump 25 is located in the wastewater buffer tank 21, and the water outlet end of the concentrated water delivery pump 25 is connected to a delivery pipeline 26.

[0029] Preferably, the wastewater buffer tank 21 is arranged at the center of the bottom end of the indirect air-cooling tower 1, and the wastewater buffer tank 21 is an underground open reinforced concrete tank.

[0030] Specifically, the inner wall of the wastewater buffer tank 21 is paved with glass fiber reinforced plastic for corrosion prevention, and the outer wall is paved with epoxy asphalt for corrosion prevention.

[0031] In addition, the wastewater buffer tank 21 is a large-capacity wastewater buffer tank, which is used to store desulfurization wastewater, regulate the system, and improve the ability to resist load impact; at the same time, the wastewater buffer tank 21 has multiple functions as an evaporation concentration tower water collection tank and an evaporation tank. The large-area wastewater buffer tank 21 can increase the contact area between the wastewater and the hot air in the indirect air cooling tower 1, thereby increasing the evaporation capacity.

[0032] Preferably, the evaporation concentration tower 22 is an assembled all-glass fiber reinforced plastic tower, which has the characteristics of good evaporation effect, high water collection rate, excellent exhaust, short construction period and strong corrosion resistance.

[0033] The desulfurized wastewater is transported to the evaporation and concentration tower 22 for evaporation and concentration through the desulfurized wastewater circulation pump 23 and the circulating water pipe 24. When the desulfurized wastewater falls from top to bottom in the evaporation and concentration tower 22, it comes into contact with hot air in the filler in the evaporation and concentration tower 22, and part of the water vapor is evaporated. The remaining desulfurized wastewater falls into the wastewater buffer tank 21, and the cycle is repeated to obtain concentrated desulfurized wastewater.

[0034] Preferably, the desulfurization wastewater circulation pump 23 and the concentrated water delivery pump 25 are horizontal self-priming pumps made of duplex steel. The desulfurization wastewater circulation pump 23 and the concentrated water delivery pump 25 are arranged beside the wastewater buffer tank 21.

[0035] Preferably, the circulating water pipe 24 and the delivery pipeline 26 are respectively steel skeleton composite pipes.

[0036] The water outlet end of the conveying pipeline 26 is connected to the evaporation crystallization section 3 located next to the boiler of the thermal power plant. The evaporation crystallization section 3 includes an evaporation drying tower 31. The top of the evaporation drying tower 31 is provided with a rotary atomizer 32 connected to the water outlet end of the conveying pipeline 26. The top of the evaporation drying tower 31 is connected to a high-temperature flue 33 from the inlet of the air preheater. The lower part of the evaporation drying tower 31 is connected to a low-temperature flue 34 that merges into the inlet of the dust collector. The bottom end of the evaporation drying tower 31 is connected to a silo pump 35 for dropping ash.

[0037] The evaporation crystallization section 3 is located next to the boiler of the thermal power plant. The high-temperature flue gas has high flue temperature and low humidity, which is suitable for directly crystallizing and solidifying the concentrated desulfurized wastewater. The continuously concentrated desulfurized wastewater is transported to the rotary atomizer 32 through the concentrated water delivery pump 25 and the delivery pipeline 26 for atomization and spraying. The high-temperature flue gas from the high-temperature flue 33 is fully in contact with the fine wastewater droplets atomized by the rotary atomizer 32, so that the water in the droplets evaporates rapidly, and the salts in the wastewater are dried and precipitated, mixed with the dust of the original flue gas, and merged into the dust collector inlet flue through the low-temperature flue 34. At the same time, a small amount of accumulated ash falls into the silo pump 35 at the bottom of the evaporation drying tower 31, and is transported to the ash storage of the thermal power plant by pressurized air for storage.

[0038] Specifically, the upper part of the evaporation drying tower 31 is a cylinder, and the lower part is a conical cylinder. The cylinder body and supporting columns of the evaporation drying tower 31 are both steel structures, and the cylinder lining is paved with corrosion-resistant materials.

[0039] Specifically, the evaporation drying tower 31 is an airtight structure for preventing leakage of smoke and waste water droplets. The evaporation drying tower 31 is connected by welding as much as possible, and flange and bolt connections are only used when necessary.

[0040] The rotary atomizer 32 is arranged at the top of the evaporation drying tower 31 to atomize the desulfurization wastewater so that the particle size distribution of the atomized droplets is uniform. This feature can prevent water from condensing on the drying tower wall when the slurry is close to the saturation temperature.

[0041] The utility model desulfurization wastewater coupling treatment device not only has low investment cost, fully utilizes waste heat, saves energy, but also improves load impact resistance, realizes desulfurization wastewater resource utilization and wastewater zero discharge.

[0042] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A desulfurization wastewater coupled treatment device, comprising an indirect air cooling tower (1) located next to a condenser of a thermal power plant, characterized in that: The indirect air-cooling tower (1) is provided with a concentration reduction section (2) for concentrating the desulfurized wastewater at the bottom end thereof, the concentration reduction section (2) comprising a wastewater buffer tank (21) disposed at the bottom end thereof, and an evaporation concentration tower (22) is disposed above the wastewater buffer tank (21); the indirect air-cooling tower (1) further comprises a desulfurized wastewater circulation pump (23) and a concentrated water delivery pump (25); the water suction end of the desulfurized wastewater circulation pump (23) is located in the wastewater buffer tank (21), the water outlet end of the desulfurized wastewater circulation pump (23) is connected to a circulation water pipe (24), and the water outlet end of the circulation water pipe (24) is connected to the upper part of the evaporation concentration tower (22); the water suction end of the concentrated water delivery pump (25) is located in the wastewater buffer tank (21), and the water outlet end of the concentrated water delivery pump (25) is connected to a delivery pipeline (26); The water outlet end of the conveying pipeline (26) is connected to an evaporation crystallization section (3) located next to a boiler of a thermal power plant. The evaporation crystallization section (3) comprises an evaporation drying tower (31). The top of the evaporation drying tower (31) is provided with a rotary atomizer (32) connected to the water outlet end of the conveying pipeline (26). The top of the evaporation drying tower (31) is connected to a high-temperature flue (33) from an air preheater inlet. The lower part of the evaporation drying tower (31) is connected to a low-temperature flue (34) that merges into a dust collector inlet. The bottom of the evaporation drying tower (31) is connected to a silo pump (35) for dropping ash.

2. The desulfurization wastewater coupling treatment device according to claim 1 is characterized in that: The wastewater buffer tank (21) is arranged at the center of the bottom end of the indirect air cooling tower (1), and the wastewater buffer tank (21) is an underground open reinforced concrete tank.

3. The desulfurization wastewater coupling treatment device according to claim 2 is characterized in that: The inner wall of the wastewater buffer tank (21) is paved with glass fiber reinforced plastic for corrosion prevention, and the outer wall is paved with epoxy asphalt for corrosion prevention.

4. The desulfurization wastewater coupling treatment device according to claim 3 is characterized in that: The evaporation concentration tower (22) is an assembled all-glass fiber reinforced plastic tower.

5. The desulfurization wastewater coupling treatment device according to claim 4 is characterized in that: The desulfurization wastewater circulation pump (23) and the concentrated water delivery pump (25) are horizontal self-priming pumps made of duplex steel.

6. The desulfurization wastewater coupling treatment device according to claim 1 is characterized in that: The evaporation drying tower (31) has a cylindrical upper portion and a conical lower portion. The cylinder body and support columns of the evaporation drying tower (31) are both steel structures, and the cylinder lining is paved with corrosion-resistant materials.

7. The desulfurization wastewater coupling treatment device according to claim 6 is characterized in that: The evaporation drying tower (31) is an airtight structure, which is used to prevent the leakage of smoke and waste water droplets.

8. The desulfurization wastewater coupling treatment device according to claim 7 is characterized in that: The desulfurization wastewater circulation pump (23) and the concentrated water delivery pump (25) are arranged at the side of the wastewater buffer tank (21).

9. The desulfurization wastewater coupling treatment device according to claim 8 is characterized in that: The circulating water pipe (24) and the delivery pipeline (26) are respectively steel skeleton composite pipes.

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