A system for evaporating and concentrating desulfurized wastewater using flue gas waste heat

Abstract

The utility model discloses a desulfurization wastewater system utilizing flue gas waste heat for evaporation concentration, and relates to the field of desulfurization wastewater treatment, including a concentration tower, a first mounting plate fixedly connected to the lower end of one side of the concentration tower, a booster fan fixedly installed on the top of the first mounting plate, a flue gas duct fixedly connected to the air inlet end of the booster fan, a spray mechanism fixedly installed on the inner upper end of the concentration tower, a wastewater duct fixedly connected to the upper end of the other side of the concentration tower, a second mounting plate fixedly connected to the lower end of the other side of the concentration tower, a circulation pump fixedly installed on the top of the second mounting plate, a circulation duct fixedly connected to the output end of the circulation pump, the other end of the circulation duct connected to the spray mechanism, a smoke exhaust pipe fixedly installed on the top of the concentration tower, and a purification mechanism fixedly installed inside the smoke exhaust pipe. The utility model adopts the above structure, and after the sprayed wastewater falls, it will be pumped out by the circulation pump and introduced into the spray mechanism again through the circulation duct so as to repeat evaporation and concentration.

Description

Technical Field

[0001] The utility model belongs to the field of desulfurization wastewater treatment, and particularly relates to a desulfurization wastewater evaporation and concentration system utilizing flue gas waste heat. Background Art

[0002] Desulfurization wastewater refers to the wastewater discharged from the thermal power generation system containing heavy metals, impurities and acidic substances. The heavy metal ions in desulfurization wastewater include both Class I and Class II pollutants, which are pollutants strictly controlled by various national environmental protection laws and regulations. The desulfurization wastewater is concentrated based on waste heat evaporation using air as a carrier. The desulfurization wastewater does not need to be softened and de-hardened beforehand. Using air as a carrier can achieve the purpose of concentrating and reducing the desulfurization wastewater.

[0003] The Chinese patent with the publication number "CN213060269U" discloses a highly efficient flue gas waste heat concentration device for desulfurized wastewater, which is mainly used in the process of flue gas waste heat evaporation and concentration of desulfurized wastewater. The device comprises a concentration tower body, a spray device, a flow equalization device, a high-efficiency demister, a concentrated slurry tank and other components. In the device, the low-temperature flue gas and the atomized desulfurized wastewater are in direct contact for heat exchange. The desulfurized wastewater absorbs the heat of the flue gas and then heats up and evaporates. The water vapor generated by evaporation is continuously carried out of the tower by the flue gas, and the desulfurized wastewater is continuously concentrated. The device provided by the utility model enhances the mass transfer and heat transfer effects of the flue gas and wastewater in the tower by optimizing the spray layer layout, adding a flow equalization device and other methods, thereby achieving highly efficient flue gas waste heat concentration of desulfurized wastewater.

[0004] When the above-mentioned desulfurization wastewater concentration treatment device is concentrating the desulfurization wastewater, the desulfurization wastewater falling into the concentration tower is not circulated and sprayed, which may easily lead to low concentration efficiency. Secondly, when the above-mentioned device discharges the gas after the reaction, it does not perform an effective purification process on the gas, which may easily lead to leakage of gas containing harmful substances. Therefore, technical improvements are needed. Utility Model Content

[0005] In view of the problems mentioned in the background technology, the purpose of the utility model is to provide a system for evaporating and concentrating desulfurized wastewater by utilizing the waste heat of flue gas, so as to solve the problems raised by the above background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A system for evaporating and concentrating desulfurized wastewater by utilizing waste heat from flue gas, comprising a concentrating tower, a first mounting plate fixedly connected to the lower end of one side of the concentrating tower, a booster fan fixedly mounted on the top of the first mounting plate, a flue gas duct fixedly connected to the air inlet end of the booster fan, a spray mechanism fixedly mounted on the inner upper end of the concentrating tower, a wastewater duct fixedly connected to the upper end of the other side of the concentrating tower, a second mounting plate fixedly connected to the lower end of the other side of the concentrating tower, a circulating pump fixedly mounted on the top of the second mounting plate, a circulating duct fixedly connected to the output end of the circulating pump, the other end of the circulating duct connected to the spray mechanism, a smoke exhaust pipe fixedly mounted on the top of the concentrating tower, a clean air filter fixedly mounted inside the smoke exhaust pipe The booster fan extracts the high-temperature flue gas through the flue gas duct, and then introduces the high-temperature flue gas into the concentration tower. The high-temperature flue gas rises from the bottom to the top. The wastewater duct introduces the desulfurization wastewater into the spray mechanism above the inside of the concentration tower. The spray mechanism sprays the desulfurization wastewater. The desulfurization wastewater reacts with the rising high-temperature flue gas during the falling process. The heat in the flue gas can evaporate a certain amount of water, so that the water vapor in the flue gas reaches saturation, and then enters the exhaust pipe. The purification mechanism inside the exhaust pipe will purify the exhausted gas. After the sprayed wastewater falls, it will be pumped out by the circulation pump, and then introduced into the spray mechanism again through the circulation duct for repeated evaporation and concentration.

[0008] As a preferred technical solution, the spray mechanism includes a spray rack, a liquid guide seat, and a nozzle. The upper end of the interior of the concentration tower is fixedly connected to the spray rack, the top of the spray rack is fixedly connected to the liquid guide seat, and a plurality of groups of nozzles are fixedly installed at equal intervals on the bottom of the spray rack. The wastewater is sprayed by the spray mechanism so as to utilize the high-temperature flue gas for evaporation and concentration.

[0009] As a preferred technical solution, the ends of the wastewater conduit and the circulation conduit are both connected to the liquid guide seat; the wastewater conduit is connected to the circulation conduit and the liquid guide seat so as to recycle the wastewater.

[0010] As a preferred technical solution, the purification mechanism includes an activated carbon filter element and a photocatalyst filter element. The activated carbon filter element and the photocatalyst filter element are fixedly installed at the upper and lower ends of the exhaust pipe respectively; the exhaust gas is purified by the purification mechanism.

[0011] As a preferred technical solution, support columns are fixedly connected to the four corners of the bottom of the concentration tower, and the bottoms of the support columns are fixedly connected to ground support seats; the concentration tower is supported by the support columns.

[0012] As a preferred technical solution, a mounting frame is fixedly connected to the bottom of the concentration tower, and a concentrated slurry pump is fixedly installed inside the mounting frame; the slurry after repeated concentration is pumped out by the concentrated slurry pump for subsequent processing.

[0013] As a preferred technical solution, a temperature sensor is fixedly installed on one side of the top of the concentration tower; the temperature inside the concentration tower is detected by the temperature sensor.

[0014] In summary, the utility model mainly has the following beneficial effects:

[0015] The booster fan extracts the high-temperature flue gas through the flue gas duct, and then introduces the high-temperature flue gas into the concentration tower. The high-temperature flue gas rises from the bottom to the top. The wastewater duct introduces the desulfurization wastewater into the spray mechanism, and the spray mechanism sprays the desulfurization wastewater. The desulfurization wastewater reacts with the rising high-temperature flue gas during the falling process. The heat in the flue gas can evaporate a certain amount of water, so that the water vapor in the flue gas reaches saturation, and then enters the exhaust pipe. The photocatalyst filter element inside the exhaust pipe is located at the bottom, which will first purify the exhausted gas to decompose the harmful substances in the gas. The gas after preliminary purification will continue to rise and be purified by the activated carbon filter element to remove fine impurities and harmful bacteria in the gas. After the sprayed wastewater falls, it will be pumped out by the circulation pump, and then introduced into the spray mechanism again through the circulation duct for repeated evaporation and concentration, thereby achieving the purpose of repeated evaporation and concentration of the desulfurization wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a bottom upward schematic diagram of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the spray mechanism of the utility model;

[0019] Figure 4 It is a cross-sectional schematic diagram of the purification mechanism of the utility model.

[0020] Figure numerals: 1. Concentration tower, 2. First mounting plate, 3. Booster fan, 4. Flue gas duct, 5. Spray mechanism, 501. Spray rack, 502. Liquid guide seat, 503. Nozzle, 6. Wastewater duct, 7. Second mounting plate, 8. Circulation pump, 9. Circulation duct, 10. Smoke exhaust pipe, 11. Purification mechanism, 1101. Activated carbon filter element, 1102. Photocatalyst filter element, 12. Support column, 13. Support seat, 14. Mounting frame, 15. Concentrate pump, 16. Temperature sensor. DETAILED DESCRIPTION

[0021] Example

[0022] refer to Figures 1 to 4A system for evaporating and concentrating desulfurized wastewater by utilizing waste heat from flue gas described in this embodiment includes a concentrating tower 1, a first mounting plate 2 is fixedly connected to the lower end of one side of the concentrating tower 1, a booster fan 3 is fixedly installed on the top of the first mounting plate 2, a flue gas duct 4 is fixedly connected to the air inlet end of the booster fan 3, a spray mechanism 5 is fixedly installed on the upper end of the inner part of the concentrating tower 1, a wastewater duct 6 is fixedly connected to the upper end of the other side of the concentrating tower 1, a second mounting plate 7 is fixedly connected to the lower end of the other side of the concentrating tower 1, a circulating pump 8 is fixedly installed on the top of the second mounting plate 7, a circulating duct 9 is fixedly connected to the output end of the circulating pump 8, and the other end of the circulating duct 9 is connected to the spray mechanism 5, a smoke exhaust pipe 10 is fixedly installed on the top of the concentrating tower 1, and a purification mechanism 11 is fixedly installed inside the smoke exhaust pipe 10.

[0023] In order to achieve the purpose of repeated evaporation and concentration of the desulfurized wastewater, the booster fan 3 on the top of the first mounting plate 2 extracts the high-temperature flue gas through the flue gas duct 4, and then introduces the high-temperature flue gas into the concentration tower 1. The high-temperature flue gas rises from the bottom to the top, and the wastewater duct 6 introduces the desulfurized wastewater into the spray mechanism 5 above the inside of the concentration tower 1. The spray mechanism 5 sprays the desulfurized wastewater. The desulfurized wastewater reacts with the rising high-temperature flue gas during the falling process. The heat in the flue gas can evaporate a certain amount of water, so that the water vapor in the flue gas reaches saturation, and then enters the exhaust pipe 10. The purification mechanism 11 inside the exhaust pipe 10 will purify the discharged gas. After the sprayed wastewater falls, it will be extracted by the circulation pump 8 on the top of the second mounting plate 7, and then introduced into the spray mechanism 5 again through the circulation duct 9 for repeated evaporation and concentration.

[0024] refer to Figure 3 The spray mechanism 5 includes a spray frame 501, a liquid guide seat 502, and a nozzle 503. The spray frame 501 is fixedly connected to the upper end of the inner part of the concentration tower 1, the liquid guide seat 502 is fixedly connected to the top of the spray frame 501, and multiple groups of nozzles 503 are fixedly installed at equal intervals on the bottom of the spray frame 501; a spray frame 501 is set, and the spray frame 501 is used to install the nozzle 503 and the liquid guide seat 502. The liquid guide seat 502 on the top of the spray frame 501 distributes the waste liquid to each nozzle 503 through a conduit, and the nozzle 503 sprays the waste water evenly so as to react with the high-temperature flue gas so as to evaporate and concentrate the waste water.

[0025] refer to Figure 3 The ends of the wastewater conduit 6 and the circulation conduit 9 are both connected to the liquid guide seat 502; since the ends of the wastewater conduit 6 and the circulation conduit 9 are both connected to the liquid guide seat 502, the wastewater can be recycled.

[0026] refer to Figure 1 and Figure 4The purification mechanism 11 includes an activated carbon filter element 1101 and a photocatalyst filter element 1102. The activated carbon filter element 1101 and the photocatalyst filter element 1102 are fixedly installed at the upper and lower ends of the interior of the smoke exhaust pipe 10 respectively; the photocatalyst filter element 1102 is arranged, and the photocatalyst filter element 1102 is located at the bottom, and the exhaust gas will be purified first to decompose the harmful substances in the gas. The gas after preliminary purification will continue to rise and be purified by the activated carbon filter element 1101 to remove fine impurities and harmful bacteria in the gas.

[0027] refer to Figure 1-2 The four corners of the bottom of the concentration tower 1 are fixedly connected with support columns 12, and the bottoms of the support columns 12 are fixedly connected with support seats 13; the support columns 12 are provided, and the support columns 12 are used to support the concentration tower 1, and the support seats 13 are used to increase the supporting area of ​​the support columns 12 so as to improve the supporting stability.

[0028] refer to Figure 2 The bottom of the concentration tower 1 is fixedly connected with a mounting frame 14, and a concentrated slurry pump 15 is fixedly installed inside the mounting frame 14; the mounting frame 14 is provided, and the inside of the mounting frame 14 is used to install the concentrated slurry pump 15, and the concentrated slurry pump 15 is used to extract the slurry after repeated concentration for subsequent processing.

[0029] refer to Figure 1 A temperature sensor 16 is fixedly installed on one side of the top of the concentration tower 1; the temperature sensor 16 is provided, and the temperature sensor 16 is used to detect the temperature inside the concentration tower 1 in real time, so as to grasp the temperature condition inside the concentration tower 1.

[0030] Principle and advantages of use: When using the device, the support column 12 is used to support the concentration tower 1, and the support seat 13 is used to increase the support area of ​​the support column 12 so as to improve the support stability. The booster fan 3 on the top of the first mounting plate 2 extracts the high-temperature flue gas through the flue gas duct 4, and then introduces the high-temperature flue gas into the concentration tower 1. The high-temperature flue gas rises from the bottom to the top. The wastewater duct 6 introduces the desulfurization wastewater into the spray mechanism 5 above the inside of the concentration tower 1. The spray rack 501 is used to install the nozzle 503 and the liquid guide seat 502. The liquid guide seat 502 on the top of the spray rack 501 distributes the waste liquid to each nozzle 503 through the duct. The nozzle 503 sprays the wastewater evenly so as to react with the high-temperature flue gas. The heat in the flue gas can evaporate a certain amount of water, so that the water vapor in the flue gas reaches saturation, and then enters the exhaust pipe 10.

[0031] The photocatalyst filter element 1102 inside the smoke exhaust pipe 10 is located at the bottom, and will first purify the exhausted gas to decompose the harmful substances in the gas. The gas after preliminary purification will continue to rise and be purified by the activated carbon filter element 1101 to remove fine impurities and harmful bacteria in the gas. After the sprayed wastewater falls, it will be pumped out by the circulation pump 8 on the top of the second mounting plate 7, and then introduced into the spray mechanism 5 again through the circulation duct 9 for repeated evaporation and concentration. The temperature sensor 16 is used to detect the temperature inside the concentration tower 1 in real time to grasp the temperature conditions inside the concentration tower 1. The interior of the mounting frame 14 is used to install the concentrated slurry pump 15, and the concentrated slurry pump 15 is used to extract the slurry after repeated concentration for subsequent treatment.

Claims

1. A system for evaporating and concentrating desulfurized wastewater by utilizing flue gas waste heat, comprising a concentration tower (1), characterized in that: A first mounting plate (2) is fixedly connected to the lower end of one side of the concentrating tower (1), a booster fan (3) is fixedly installed on the top of the first mounting plate (2), a flue gas duct (4) is fixedly connected to the air inlet end of the booster fan (3), a spray mechanism (5) is fixedly installed on the inner upper end of the concentrating tower (1), a wastewater duct (6) is fixedly connected to the upper end of the other side of the concentrating tower (1), a second mounting plate (7) is fixedly connected to the lower end of the other side of the concentrating tower (1), a circulation pump (8) is fixedly installed on the top of the second mounting plate (7), a circulation duct (9) is fixedly connected to the output end of the circulation pump (8), and the other end of the circulation duct (9) is connected to the spray mechanism (5), a smoke exhaust pipe (10) is fixedly installed on the top of the concentrating tower (1), and a purification mechanism (11) is fixedly installed inside the smoke exhaust pipe (10).

2. The system for desulfurization wastewater by evaporation and concentration using flue gas waste heat according to claim 1, characterized in that: The spray mechanism (5) comprises a spray frame (501), a liquid guide seat (502), and a nozzle (503); the spray frame (501) is fixedly connected to the upper end of the interior of the concentration tower (1); the top of the spray frame (501) is fixedly connected to the liquid guide seat (502); and a plurality of groups of nozzles (503) are fixedly installed at equal intervals on the bottom of the spray frame (501).

3. A system for evaporating and concentrating desulfurized wastewater by utilizing flue gas waste heat according to claim 2, characterized in that: The ends of the wastewater conduit (6) and the circulation conduit (9) are both connected to the liquid guide seat (502).

4. The system for desulfurization wastewater by evaporation and concentration using flue gas waste heat according to claim 1, characterized in that: The purification mechanism (11) comprises an activated carbon filter element (1101) and a photocatalyst filter element (1102), and the activated carbon filter element (1101) and the photocatalyst filter element (1102) are fixedly mounted at the upper and lower ends of the interior of the smoke exhaust pipe (10), respectively.

5. The system for desulfurization wastewater by evaporation and concentration using flue gas waste heat according to claim 1 is characterized in that: The four corners at the bottom of the concentration tower (1) are all fixedly connected to support columns (12), and the bottoms of the support columns (12) are all fixedly connected to ground support seats (13).

6. The system for evaporating and concentrating desulfurized wastewater by utilizing flue gas waste heat according to claim 1, characterized in that: The bottom of the concentration tower (1) is fixedly connected to a mounting frame (14), and a thick slurry pump (15) is fixedly installed inside the mounting frame (14).

7. The system for evaporating and concentrating desulfurized wastewater by utilizing flue gas waste heat according to claim 1, characterized in that: A temperature sensor (16) is fixedly mounted on one side of the top of the concentration tower (1).

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