A reentrant high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation

Abstract

The present invention discloses a reentrant high-salt wastewater concentrator for low-temperature flue gas waste heat evaporation. The tower comprises a smoke inlet channel, a reentrant flue, a purification flue, and a smoke outlet channel. The smoke inlet and smoke outlet channels are parallel to each other, and the reentrant flue is perpendicular to the smoke inlet channel. The smoke inlet channel is equipped with a circulating spray device, and a water collection tank is located below the circulating spray device, which is connected to a bottom water pool. The purification flue is equipped with a rectifying device and a demisting device, with the demisting device located downstream of the rectifying device. The reentrant design of the present invention reduces the size of the concentrator by 30% and the floor space by 50% compared to traditional low-temperature flue gas waste heat evaporation technology.

Description

Technical Field

[0001] The invention relates to a reentry type high-salt wastewater concentration tower for evaporating low-temperature flue gas waste heat, and belongs to the field of high-salt wastewater concentration and reduction in coal-fired power plants. Background Art

[0002] Concentration and reduction of high-salinity wastewater involves using technical means to separate some of the water, leaving behind a higher concentration of salt but a reduced total amount. The goal of concentration and reduction is to reduce the amount of wastewater entering subsequent solidification treatment, thereby reducing the total investment and operating costs of the wastewater treatment system. Existing concentration and reduction processes primarily include membrane concentration and reduction and low-temperature flue gas waste heat evaporation. Membrane concentration and reduction require pre-treatment of high-salinity wastewater through clarification, filtration, ultrafiltration, and reverse osmosis, resulting in complex treatment processes and short membrane life cycles. Low-temperature flue gas waste heat evaporation and reduction utilizes the residual heat of flue gas (120-130°C) before and after desulfurization to heat high-salinity wastewater for evaporation and reduction. This technology offers a simple system that effectively utilizes flue gas waste heat for concentration and reduction. However, the concentrators are generally large (approximately 5m × 7m × 10m in length × width × height), and are often limited by space requirements for renovations, making implementation difficult. Summary of the Invention

[0003] The purpose of the present invention is to provide a reentrant high-salt wastewater concentrator for low-temperature flue gas waste heat evaporation. The reentrant design reduces the size of the concentrator by 30% and the floor space by 50% compared with traditional low-temperature flue gas waste heat evaporation technology.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A reversing high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat comprises a smoke inlet channel, a reversing flue, a purification flue and a smoke outlet channel which are connected to each other. The smoke inlet channel and the smoke outlet channel are parallel to each other, and the reversing flue is perpendicular to the smoke inlet channel. A circulating spray device is provided in the smoke inlet channel, a water collecting trough is provided below the circulating spray device, and the water collecting trough is connected to a bottom water pool. A rectifying device and a demisting device are provided in the purification flue, and the demisting device is located downstream of the rectifying device.

[0006] In the aforementioned reentrant high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat, the rectifier device has a plurality of guide channels arranged in a matrix, the air inlet of the guide channel has a baffle door and a drive motor, the baffle door is connected to the output shaft of the drive motor, and the drive motor is electrically connected to the control device; the air outlet of the guide channel has a wind speed measuring device, and the wind speed measuring device is electrically connected to the display via the control device.

[0007] In the aforementioned reversible high-salt wastewater concentration tower used for low-temperature flue gas waste heat evaporation, the smoke inlet channel and the smoke outlet channel are both arranged vertically, the reversing flue is arranged horizontally, the lower ends of the smoke inlet channel and the smoke outlet channel are connected to the reversing flue, and the connections between the smoke inlet channel, the smoke outlet channel and the reversing flue are provided with guide plates.

[0008] In the aforementioned reversible high-salt wastewater concentration tower used for evaporation of waste heat from low-temperature flue gas, the water collection trough is located at the bottom of the reversing flue, and the bottom of the reversing flue is also provided with a water slide plate, which is arranged at an angle. The water collection trough is located on one side of the water slide plate, and the end of the water slide plate close to the water collection trough is lower.

[0009] In the aforementioned reversible high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation, the purification flue is located above the reversible flue, the purification flue is horizontally arranged, the defogger is vertically arranged, and the rectifier is inclined, with an angle of 10 to 25 degrees between the rectifier and the defogger.

[0010] In the aforementioned reentry-type high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat, the flue gas inlet of the smoke inlet channel is arranged horizontally, and the flue gas outlet of the smoke outlet channel is arranged horizontally.

[0011] In the aforementioned reversible high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat, the smoke inlet channel and the smoke outlet channel are both arranged horizontally, the reversing flue is arranged vertically, and the smoke inlet channel and the smoke outlet channel are connected to the reversing flue at one end, and the smoke inlet channel and the smoke outlet channel are connected to the reversing flue at the connection. Guide plates are provided.

[0012] In the aforementioned reentry-type high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation, the water collection tank is located at the bottom of the purification flue, and the bottom of the purification flue is also provided with a water slide plate, which is arranged at an angle. The water collection tank is located on one side of the water slide plate, and the end of the water slide plate close to the water collection tank is lower.

[0013] In the aforementioned reversible high-salt wastewater concentration tower for evaporation of waste heat from low-temperature flue gas, the purification flue is located on one side of the reversible flue, the purification flue is vertically arranged, the lower end of the reversible flue is connected to the lower end of the purification flue, the defogger is horizontally arranged, and the rectifier is inclined, with an angle of 10 to 25 degrees between the rectifier and the defogger.

[0014] In the aforementioned reentrant high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat, the flue gas inlet of the smoke inlet channel is vertically arranged, and the flue gas outlet of the smoke outlet channel is horizontally arranged.

[0015] Compared to existing technologies, the present invention utilizes a zigzag design. Compared to traditional low-temperature flue gas waste heat evaporation technology, the concentrator's size is reduced by 30% and its footprint is reduced by 50%. The concentrator tower primarily consists of a connected smoke inlet channel, a zigzag flue, a purification flue, and a smoke outlet channel; the smoke inlet and smoke outlet channels are separated by a partition. High-salinity wastewater is first ejected through a circulating spray device. Because low-temperature flue gas exists within the smoke inlet channel, the heat from the low-temperature flue gas is transferred to the ejected high-salinity wastewater, evaporating and concentrating it, or returning it to the bottom pool through a sump. The concentrator tower utilizes a zigzag design. The air inlet and smoke inlet channel have a first zigzag, the smoke inlet channel and zigzag flue have a second zigzag, the zigzag flue and purification flue have a third zigzag, the purification flue and smoke outlet channel have a fourth zigzag, and the smoke outlet channel and smoke outlet have a fifth zigzag. These five zigzags shorten the overall length and reduce the footprint. By adjusting the drive motor, the inlet opening of the guide channel can be adjusted, thereby adjusting the air outlet wind speed, so that the air outlet wind speed of each guide channel is the same, which is beneficial to improving the overall effect consistency of the defogger device and improving the operating stability of the defogger device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0017] Figure 2 is a structural schematic diagram of another embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the layout of the diversion channel;

[0019] Figure 4 It is a schematic diagram of the internal structure of the diversion channel.

[0020] Figure numerals: 1-smoke inlet channel, 2-circulating spray device, 3-water collecting trough, 4-water slide plate, 5-guide plate, 6-rectifier, 7-demist device, 8-smoke outlet channel, 9-partition, 10-bottom water pool, 11-return flue, 12-purification flue, 13-guide channel, 14-drive motor, 15-baffle door, 16-wind speed measuring device.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0022] Embodiment 1 of the present invention: Figure 1As shown, a reversing high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat comprises a connected smoke inlet channel 1, a reversing flue 11, a purification flue 12, and a smoke outlet channel 8. The smoke inlet channel 1 and the smoke outlet 8 are parallel to each other, and the reversing flue 11 is perpendicular to the smoke inlet channel 1. The smoke inlet channel 1 is provided with a circulating spray device 2, and a water collection tank 3 is provided below the circulating spray device 2. The water collection tank 3 is connected to the bottom water pool 10. The purification flue 12 is provided with a rectifying device 6 and a demisting device 7, and the demisting device 7 is located downstream of the rectifying device 6. The rectifying device 6 has a plurality of guide channels 13 arranged in a matrix. The air inlet of the guide channel 13 is provided with a baffle door 15 and a drive motor 14. The baffle door 15 is connected to the output shaft of the drive motor 14, and the drive motor 14 is electrically connected to the control device. The air outlet of the guide channel 13 is provided with a wind speed measuring device 16, and the wind speed measuring device 16 is electrically connected to the display via the control device.

[0023] The smoke inlet channel 1 and the smoke outlet channel 8 are both arranged vertically, and the return flue 11 is arranged horizontally. The lower ends of the smoke inlet channel 1 and the smoke outlet channel 8 are connected to the return flue 11. The connection between the smoke inlet channel 1 and the smoke outlet channel 8 and the return flue 11 is provided with a guide plate 5. The water collecting trough 3 is located at the bottom of the return flue 11. The bottom of the return flue 11 also has a water slide plate 4. The water slide plate 4 is arranged at an angle. The water collecting trough 3 is located on one side of the water slide plate 4. The end of the water slide plate 4 close to the water collecting trough 3 is lower. The purification flue 12 is located above the return flue 11. The purification flue 12 is arranged horizontally. The demisting device 7 is arranged vertically. The rectifying device 6 is arranged at an angle. There is an angle of 10 to 25 degrees between the rectifying device 6 and the demisting device 7. The smoke inlet of the smoke inlet channel 1 is arranged horizontally, and the smoke outlet of the smoke outlet channel 8 is arranged horizontally.

[0024] Example 2: Figure 2 As shown, a reversing high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat comprises a connected smoke inlet channel 1, a reversing flue 11, a purification flue 12, and a smoke outlet channel 8. The smoke inlet channel 1 and the smoke outlet 8 are parallel to each other, and the reversing flue 11 is perpendicular to the smoke inlet channel 1. The smoke inlet channel 1 is provided with a circulating spray device 2, and a water collection tank 3 is provided below the circulating spray device 2. The water collection tank 3 is connected to the bottom water pool 10. The purification flue 12 is provided with a rectifying device 6 and a demisting device 7, and the demisting device 7 is located downstream of the rectifying device 6. The rectifying device 6 has a plurality of guide channels 13 arranged in a matrix. The air inlet of the guide channel 13 is provided with a baffle door 15 and a drive motor 14. The baffle door 15 is connected to the output shaft of the drive motor 14, and the drive motor 14 is electrically connected to the control device. The air outlet of the guide channel 13 is provided with a wind speed measuring device 16, and the wind speed measuring device 16 is electrically connected to the display via the control device.

[0025] The smoke inlet channel 1 and the smoke outlet channel 8 are both arranged horizontally, and the return flue 11 is arranged vertically. One end of each of the smoke inlet channel 1 and the smoke outlet channel 8 is connected to the return flue 11. A guide plate 5 is provided at the connection between the smoke inlet channel 1 and the smoke outlet channel 8 and the return flue 11. The water collection trough 3 is located at the bottom of the purification flue 12. The bottom of the purification flue 12 also has a water slide 4. The water slide 4 is arranged at an angle. The water collection trough 3 is located on one side of the water slide 4, and the end of the water slide 4 near the water collection trough 3 is lower. The purification flue 12 is located on one side of the return flue 11. The purification flue 12 is arranged vertically, and the lower end of the return flue 11 is connected to the lower end of the purification flue 12. The demisting device 7 is arranged horizontally, and the rectifying device 6 is arranged at an angle. There is an angle of 10 to 25 degrees between the rectifying device 6 and the demisting device 7. The smoke inlet of the smoke inlet channel 1 is arranged vertically, and the smoke outlet of the smoke outlet channel 8 is arranged horizontally.

[0026] The working principle of an embodiment of the present invention: This concentration tower is mainly composed of a connected smoke inlet channel 1, a return flue 11, a purification flue 12 and a smoke outlet channel 8; the smoke inlet channel 1 and the smoke outlet channel 8 are separated by a partition 9. High-salt wastewater is first sprayed out through the circulating spray device 2. Since there is low-temperature flue gas in the smoke inlet channel 1, the heat of the low-temperature flue gas will be transferred to the sprayed high-salt wastewater, evaporating and concentrating the high-salt wastewater or returning it to the bottom water pool 10 through the water collection tank 3. This concentration tower adopts a return design. The air inlet of the smoke inlet channel 1 and the smoke inlet channel 1 have a first return, the smoke inlet channel 1 and the return flue 11 have a second return, the return flue 11 and the purification flue 12 have a third return, the purification flue 12 and the smoke outlet channel 8 have a fourth return, and the smoke outlet channel 8 and the smoke outlet of the smoke outlet channel have a fifth return. These five returns can shorten the overall length and reduce the floor space. By adjusting the driving motor 14, the inlet opening of the guide channel 13 can be adjusted, thereby adjusting the air outlet wind speed thereof, so that the air outlet wind speed of each guide channel 13 is the same, which is beneficial to improving the overall effect consistency of the defogger 7 and improving the operating stability of the defogger.

Claims

1. A reentrant high-salt wastewater concentration tower for evaporation of low-temperature flue gas waste heat, characterized in that: The smoke inlet channel (1), the return channel (11), the purification channel (12) and the smoke outlet channel (8) are connected to each other, the return channel (11) is perpendicular to the smoke inlet channel (1); the smoke inlet channel (1) is provided with a circulating spray device (2), the circulating spray device (2) is provided with a water collecting tank (3) below, and the water collecting tank (3) is connected to the bottom water pool (10); the purification channel (12) is provided with a rectifying device (6) and a demisting device (7), and the demisting device (7) is located downstream of the rectifying device (6); The rectifying device (6) has a plurality of flow guide channels (13) arranged in a matrix. The air inlet of the flow guide channel (13) has a baffle door (15) and a drive motor (14). The baffle door (15) is connected to the output shaft of the drive motor (14). The drive motor (14) is electrically connected to the control device. The air outlet of the flow guide channel (13) has a wind speed measuring device (16). The wind speed measuring device (16) is electrically connected to the display via the control device. The smoke inlet channel (1) and the smoke outlet channel (8) are both arranged vertically, and the return flue (11) is arranged horizontally. The lower ends of the smoke inlet channel (1) and the smoke outlet channel (8) are both connected to the return flue (11), and guide plates (5) are provided at the connection points between the smoke inlet channel (1) and the smoke outlet channel (8) and the return flue (11).

2. The reentrant high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation according to claim 1, characterized in that: The water collecting trough (3) is located at the bottom of the return flue (11), and the bottom of the return flue (11) is also provided with a water slide plate (4), and the water slide plate (4) is arranged at an angle. The water collecting trough (3) is located on one side of the water slide plate (4), and the end of the water slide plate (4) close to the water collecting trough (3) is lower.

3. The reentrant high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation according to claim 2, characterized in that: The purification flue (12) is located above the return flue (11), the purification flue (12) is arranged horizontally, the demisting device (7) is arranged vertically, and the rectifying device (6) is arranged obliquely, with an angle of 10 to 25 degrees between the rectifying device (6) and the demisting device (7).

4. The reentrant high-salt wastewater concentration tower for low-temperature flue gas waste heat evaporation according to claim 3, characterized in that: The smoke inlet of the smoke inlet channel (1) is arranged horizontally, and the smoke outlet of the smoke outlet channel (8) is arranged horizontally.

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