Device for evaporating wastewater by using hot gas and wet desulfurization wastewater evaporation treatment device
By designing a hot gas evaporation wastewater device, using deflectors and liquid level monitoring, the wastewater is prevented from entering the airflow directly, and the problems of inorganic salt pollution and flue gas system after wet desulfurization wastewater treatment are solved, and efficient evaporation of wastewater and stable system operation are achieved.
Patent Information
- Application Number
- CN202422217731.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-10
AI Technical Summary
In the prior art, wet desulfurization wastewater still contains a large amount of inorganic chloride salt after treatment, which directly discharges lead to environmental pollution, and the use of flue gas heat evaporation device can easily affect the normal operation of the flue gas purification system.
Design a device to evaporate wastewater by using hot gas, guide the hot gas to the inner wall or deflector through the inlet pipe to avoid blowing directly to the wastewater. Combined with liquid level monitoring and automated control, the evaporation treatment of wastewater is realized, and the impact on the flue gas purification system is reduced through the series evaporation device.
Effectively reduce the possibility of wastewater entering the airflow, promote wastewater evaporation, reduce the impact on the flue gas purification system, avoid equipment wear, and achieve environmentally friendly wastewater treatment and stable operation of the system.
Smart Images
Figure CN223163254U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wastewater treatment, in particular to a device for evaporating wastewater by using hot gas, and a device for evaporating and treating wet desulfurization wastewater by using hot gas in a flue gas purification system. Background Art
[0002] At present, the wastewater generated by the wet desulfurization system is simply treated by precipitation, neutralization and air flotation processes to remove suspended solids and heavy metals in the wastewater, and can only meet the requirements of the effluent water quality control index of the desulfurization wastewater treatment device in the "Water Quality Control Index for Limestone-Gypsum Wet Desulfurization Wastewater in Coal-Fired Power Plants" (DL / T 997-2020). Although the wastewater treated by this process has no solid particles, it still dissolves a large amount of harmful inorganic chloride salts. If the wet desulfurization wastewater is not deeply treated but used for spraying roads or directly discharged, it will cause serious soil salinization, resulting in problems such as the inability of vegetation to grow and groundwater pollution, which are serious environmental pollution problems.
[0003] The flue gas purification system of an electrolytic aluminum enterprise has a flue gas pipeline for collecting flue gas. In summer, the temperature inside the flue gas pipeline is about 100°C, and in winter, the temperature inside the flue gas pipeline is about 70°C. The heat of the flue gas pipeline can be fully utilized to evaporate and treat the desulfurization wastewater.
[0004] In the prior art, there are already various treatment devices for evaporating desulfurization wastewater by using the heat of the flue gas pipeline. These treatment devices can be divided into two categories: those in which the flue gas is in direct contact with the desulfurization wastewater and those in which the flue gas is not in direct contact with the desulfurization wastewater. The treatment device in which the flue gas is in direct contact with the desulfurization wastewater atomizes or sprays the wastewater to increase the contact area between the wastewater and the flue gas and improve the evaporation efficiency of the wastewater. However, the wastewater is likely to enter the next process along with the air flow. If the heat is provided by the flue gas pipeline of the flue gas purification system, it will cause the wastewater to enter the flue gas pipeline and cause a significant temperature drop in the flue gas pipeline, affecting the normal operation of the flue gas purification system. Content of the Utility Model
[0005] The utility model first provides a device for evaporating wastewater by using hot gas, aiming to reduce the possibility of wastewater entering the air flow.
[0006] The technical solution adopted by the utility model is: a device for evaporating wastewater by using hot gas, including a box body and a wastewater hopper located inside the box body. The box body is provided with a door or cover that can be opened and closed. The top of the wastewater hopper is an open structure. The box body is provided with an air inlet pipe, an exhaust pipe and a water inlet pipe. The water inlet pipe, the air inlet pipe and the exhaust pipe are hermetically fitted with the box body. The air outlet direction of the air inlet pipe faces the side wall of the wastewater hopper or the inner wall of the box body. The water outlet end of the water inlet pipe is located inside the wastewater hopper, or the water outlet end of the water inlet pipe is located outside the wastewater hopper but the water falling point is located inside the wastewater hopper.
[0007] To facilitate the monitoring of the liquid level in the wastewater hopper, further: The device for evaporating wastewater using hot air further includes a liquid level tank located outside the box body, and the wastewater hopper is connected to the liquid level tank through a connecting pipe. Even further: The liquid level tank is provided with an overflow pipe and a drain pipe, and a liquid level switch is provided inside the liquid level tank.
[0008] To prevent the hot air from concentrating on a fixed position after entering the box body and causing wear or even piercing at that position, further: A baffle is fixedly installed inside the box body, the air outlet direction of the air inlet pipe faces the baffle, and the baffle is provided with a breathable structure arranged in rows and columns.
[0009] To improve the heat insulation effect of the box body, further: A heat insulation layer is provided on the inner wall or outer wall of the box body.
[0010] To promote the full flow of the gas inside the box body, further: The air inlet pipe and the exhaust pipe are respectively located on opposite sides of the box body.
[0011] To facilitate opening the box body and removing the wastewater hopper, further: The outer contour of the box body is a cuboid, and the four vertical surfaces of the cuboid are respectively the front, back, left, and right sides of the box body. The entire front surface of the box body is provided with an opening and a box door. Inside surfaces of the left and right sides of the box body are respectively fixedly provided with a chute, the chutes are horizontally arranged, and two mutually parallel crossbars are fixedly installed at the top of the wastewater hopper. Rollers are respectively fixedly installed at both ends of the two crossbars, and the rollers at both ends of the two crossbars are respectively placed in the two chutes of the box body.
[0012] Specifically: Inside surfaces of the left and right sides of the box body are respectively fixedly provided with a channel steel, the channel steel forms the chute, one side of the box door is hinged to the box body, a box door lock is arranged between the box body and the box door, and a fixed pin is arranged between the box body and the wastewater hopper.
[0013] The beneficial effects of the device for evaporating wastewater using hot air of the present utility model are: After the hot air enters the box body, it blows towards the side wall of the wastewater hopper or the inner wall of the box body, rather than directly towards the wastewater, reducing the possibility of wastewater entering the air flow. After the hot air enters the box body and blows towards the side wall of the wastewater hopper, it can continuously heat the wastewater hopper and promote the continuous evaporation of the wastewater. The box body can form a closed inner cavity. After the hot air enters the box body from the air inlet pipe, it can only be discharged from the exhaust pipe, avoiding the random emission of hot air. For the crystalline substances left in each wastewater hopper, it can be cleaned by opening the box body.
[0014] The present utility model also provides a wet desulfurization wastewater evaporation treatment device, aiming to reduce the impact on the flue gas purification system when evaporating the desulfurization wastewater by using the heat of the flue gas pipeline in the flue gas purification system. The technical solution adopted by the present utility model is as follows: The wet desulfurization wastewater evaporation treatment device includes a flue gas pipeline and at least one set of the above-mentioned device for evaporating wastewater by using hot gas. When there is one set of the device for evaporating wastewater by using hot gas, the inlet pipe and the exhaust pipe are respectively connected in parallel to two positions with a pressure difference in the flue gas pipeline; when there are two sets or more sets of the device for evaporating wastewater by using hot gas, each set of the device for evaporating wastewater by using hot gas is connected in series through the inlet pipe and the exhaust pipe, and the inlet pipes and the exhaust pipes of the two sets of the device for evaporating wastewater by using hot gas located at the ends are respectively connected in parallel to two positions with a pressure difference in the flue gas pipeline.
[0015] In order to achieve automatic control, further: The wet desulfurization wastewater evaporation treatment device further includes a water pump and a wastewater tank. The inlet pipe of the water pump is located in the wastewater tank, the outlet pipe of the water pump is respectively connected to each inlet pipe, control valves are respectively arranged on each inlet pipe, and a liquid level switch is arranged inside the wastewater tank.
[0016] The beneficial effect of the wet desulfurization wastewater evaporation treatment device of the present utility model is as follows: The present utility model evaporates the desulfurization wastewater by using the heat of the hot gas in the flue gas pipeline of the flue gas purification system. Since the hot gas does not directly blow to the wastewater, the evaporation amount is not large, and the impact on the flue gas purification system is very small, and it will not affect the normal operation of the flue gas purification system. A liquid level switch is arranged inside the wastewater tank, which can realize that the water pump does not start when there is no desulfurization wastewater in the wastewater tank, avoiding damage to the water pump. Description of the Drawings
[0017] Figure 1 It is a schematic structural diagram of an embodiment of the device for evaporating wastewater by using hot gas of the present utility model.
[0018] Reference numerals: box body 1, box door 11, inlet pipe 12, exhaust pipe 13, inlet water pipe 14, channel steel 15, box door lock 16, fixing pin 17, wastewater hopper 2, cross bar 21, roller 22, liquid level box 3, connecting pipe 31, overflow pipe 32, vent pipe 33, liquid level switch 34, guide plate 4. Detailed Embodiment
[0019] The present utility model will be further described below with reference to the drawings.
[0020] The first theme of the present utility model is the device for evaporating wastewater by using hot gas. As Figure 1As shown in the figure, the device for evaporating wastewater using hot air includes a box body 1 and a wastewater hopper 2 located inside the box body 1. The box body 1 is used to install or place the wastewater hopper 2 and provide a sealed evaporation space. To improve the heat preservation effect of the box body 1, a heat preservation layer can also be provided on the inner wall or outer wall of the box body 1. The box body 1 is provided with a box door 11 that can be opened and closed. The box door 11 is generally arranged on the side wall of the box body 1, or the box body 1 is provided with a box cover that can be opened and closed. The size of the box door 11 and the box cover is larger than the size of the wastewater hopper 2 to facilitate the placement of the wastewater hopper 2 into the box body 1. By opening the box cover, the wastewater hopper 2 can be placed into and taken out of the box body 1 by means of hoisting. For example, the outer contour of the box body 1 is in the shape of a cuboid. The four vertical faces of the cuboid are the front, back, left side, and right side of the box body 1 respectively. The entire front face of the box body 1 is provided with an opening and the box door 11. One side of the box door 11 is hinged to the box body 1, and a box door lock 16 is arranged between the box body 1 and the box door 11. The box door lock 16 only needs to fix the box door 11 to the box body 1 and maintain the seal. For example, the box door lock 16 is a door bolt. The wastewater hopper 2 is used to hold the wastewater to be evaporated. The top of the wastewater hopper 2 is an open structure, that is, the wastewater hopper 2 has no top cover. The outer contour of the wastewater hopper 2 can be frustum-shaped, truncated cone-shaped, cylindrical, or prismatic. For example, it is frustum-shaped with a smaller bottom and a larger top. The wastewater hopper 2 can be made of metal or plastic. For example, the material of the wastewater hopper 2 is steel, PPH polypropylene, or FRP fiberglass.
[0021] The box body 1 is provided with an air inlet pipe 12 and an exhaust pipe 13. The water inlet pipe 14, the air inlet pipe 12, and the exhaust pipe 13 are in sealed cooperation with the box body 1. The air inlet pipe 12 is used to introduce hot air into the box body, and the exhaust pipe 13 is used to exhaust hot air. The evaporated water vapor is discharged from the exhaust pipe 13 together. The air outlet direction of the air inlet pipe 12 faces the side wall of the wastewater hopper 2 or the inner wall of the box body 1 to avoid the hot air directly blowing towards the wastewater, causing the possibility of the wastewater entering the air flow and being discharged from the exhaust pipe 13. To prevent the hot air from concentrating and blowing towards a certain fixed position after entering the box body 1, resulting in wear or even abrasion through at that position, a flow guide plate 4 is fixedly installed inside the box body 1. The air outlet direction of the air inlet pipe 12 faces the flow guide plate 4, and the flow guide plate 4 is provided with a breathable structure arranged in rows and columns. The flow guide plate 4 plays a role in dispersing the air flow. The breathable structure can be breathable holes or a breathable net, or it can also be multiple wind guide plates arranged in a horizontal and vertical cross pattern. To promote the full flow of the gas inside the box body 1, the air inlet pipe 12 and the exhaust pipe 13 are respectively located on opposite sides of the box body 1 and are preferably diagonally distributed. The air inlet pipe 12 and the exhaust pipe 13 are generally made of steel pipes with a diameter of ∮100mm to ∮300mm. To facilitate the control of the hot air flow rate, flow regulating valves are respectively arranged on the air inlet pipe 12 and the exhaust pipe 13.
[0022] The box body 1 is also provided with a water inlet pipe 14. The water inlet pipe 14 is used to introduce wastewater into the wastewater hopper 2. The water outlet end of the water inlet pipe 14 is located inside the wastewater hopper 2, or the water outlet end of the water inlet pipe 14 is located outside the wastewater hopper 2 but the water falling point is located inside the wastewater hopper 2. In order to facilitate the monitoring of the liquid level of the wastewater hopper 2, a liquid level gauge is arranged inside the wastewater hopper 2; alternatively, the device for evaporating wastewater by hot air further includes a liquid level tank 3. The liquid level tank 3 is located outside the box body 1, and the wastewater hopper 2 is connected to the liquid level tank 3 through a connecting pipe 31. A communicating vessel is formed between the wastewater hopper 2 and the liquid level tank 3, and the liquid level tank 3 can accurately reflect the liquid level of the wastewater hopper 2 in real time. The connecting pipe 31 between the wastewater hopper 2 and the liquid level tank 3 can be one or two. For example, the connecting pipe 31 is two steel pipes with a diameter of ∮25mm to ∮50mm, and the two steel pipes are installed at different heights. A sealing structure is arranged at the position where the connecting pipe 31 penetrates the box body. The liquid level tank 3 can also be provided with an overflow pipe 32 and a drain pipe 33 to prevent wastewater from overflowing from the wastewater hopper 2 into the box body 1. A liquid level switch 34 is arranged inside the liquid level tank 3, and the liquid level switch 34 is used to monitor the liquid level of the liquid level tank 3. The liquid level switch 34 inside the liquid level tank 3 can be one or two, and the two liquid level switches 34 respectively correspond to the liquid level upper limit and the liquid level lower limit.
[0023] In order to facilitate manually opening the box body 1 and removing the wastewater hopper 2, when the box body 1 is in a cuboid shape, a chute is fixedly arranged on the inner sides of the left side and the right side of the box body 1 respectively. The chute is horizontally arranged. Two mutually parallel cross bars 21 are fixedly arranged at the top of the wastewater hopper 2. Roller wheels 22 are fixedly installed at both ends of the two cross bars 21 respectively. The roller wheels 22 at both ends of the two cross bars 21 are respectively placed in the two chutes of the box body 1. The cross bars 21 are directly welded to the wastewater hopper 2, or can be fixed to the top of the wastewater hopper 2 by mechanical connection means. The roller wheels 22 can be selected as bearings or existing wheels. The chute can be the structure of the box body 1 or the structure formed by an object fixed on the box body 1. For example, a channel steel 15 is fixedly arranged on the inner sides of the left side and the right side of the box body 1 respectively. The cross section of the channel steel 15 is in a C shape, and the channel steel 15 forms the chute. A pin can also be arranged at one end of the channel steel 15 close to the box door 11 to prevent the rear roller wheels 22 from sliding out of the chute.
[0024] In order to improve the stability of the wastewater hopper 2, a fixing pin 17 is arranged between the box body 1 and the wastewater hopper 2. The fixing pin 17 is used to temporarily fix the wastewater hopper 2 inside the box body 1. By releasing the fixing pin 17, the wastewater hopper 2 can be pulled out of the box body 1.
[0025] The second theme of the present utility model is a wet desulfurization wastewater evaporation treatment device. See Figure 1, The wet desulfurization wastewater evaporation treatment device includes a flue gas pipeline and at least one set of the device for evaporating wastewater using hot gas described in the first subject above, where the flue gas pipeline is a part of the flue gas purification system. The number of sets of the device for evaporating wastewater using hot gas is determined according to the amount of desulfurization wastewater to be treated. When there is one set of the device for evaporating wastewater using hot gas, the inlet pipe 12 and the exhaust pipe 13 are respectively connected in parallel to two positions with a pressure difference in the flue gas pipeline. When there are two or more sets of the device for evaporating wastewater using hot gas, each set of the device for evaporating wastewater using hot gas is connected in series through the inlet pipe 12 and the exhaust pipe 13, and the inlet pipes 12 and the exhaust pipes 13 of the two sets of the device for evaporating wastewater using hot gas at the ends are respectively connected in parallel to two positions with a pressure difference in the flue gas pipeline. The hot air in the flue gas pipeline enters the box body 1 through the inlet pipe 12 and then returns to the flue gas pipeline through the exhaust pipe 13, and the temperature of the hot air in the flue gas pipeline will not drop too much.
[0026] To achieve automatic control, the wet desulfurization wastewater evaporation treatment device further includes a water pump and a wastewater tank. The inlet pipe 14 of the water pump is located in the wastewater tank, and the outlet pipe of the water pump is respectively connected to each inlet pipe 14. The water pump is used to pump the desulfurization wastewater into each wastewater hopper 2, and control valves are respectively arranged on each inlet pipe 14 to facilitate precise control of the amount of desulfurization wastewater pumped into each wastewater hopper 2. A liquid level switch is arranged inside the wastewater tank, which can prevent the water pump from starting when there is no desulfurization wastewater in the wastewater tank, avoiding damage to the water pump. When the liquid level tank 3 is at a low water level and the wastewater tank is not at a low water level, the water pump is started to inject desulfurization wastewater into the wastewater hopper 2. When the liquid level tank 3 is at a high water level, the water pump is turned off to stop injecting desulfurization wastewater into the wastewater hopper 2. When there is no desulfurization wastewater in the liquid level tank 3, the inlet pipe 12 and the exhaust pipe 13 are closed, and the box body 1 is opened for inspection.
Claims
1. An apparatus for evaporating wastewater using hot air, characterized in that: It includes a box body (1) and a waste water hopper (2) located inside the box body (1). The box body (1) is provided with a box door (11) or a box cover that can be opened and closed. The top of the waste water hopper (2) is an open structure. The box body (1) is provided with an air inlet pipe (12), an exhaust pipe (13) and a water inlet pipe (14). The water inlet pipe (14), the air inlet pipe (12) and the exhaust pipe (13) are sealingly fitted with the box body (1). The air outlet direction of the air inlet pipe (12) faces the side wall of the waste water hopper (2) or the inner wall of the box body (1). The water outlet end of the water inlet pipe (14) is located inside the waste water hopper (2), or the water outlet end of the water inlet pipe (14) is located outside the waste water hopper (2) but the water falling point is located inside the waste water hopper (2).
2. The device for evaporating wastewater using hot gas as claimed in claim 1, wherein: The device for evaporating waste water using hot gas further includes a liquid level tank (3). The liquid level tank (3) is located outside the box body (1). The waste water hopper (2) is connected to the liquid level tank (3) through a connecting pipe (31).
3. The device for evaporating wastewater using hot air as claimed in claim 2, wherein: The liquid level tank (3) is provided with an overflow pipe (32) and a drain pipe (33). A liquid level switch (34) is arranged inside the liquid level tank (3).
4. The device for evaporating wastewater by using hot gas according to claim 1, wherein: A baffle plate (4) is also fixedly installed inside the box body (1). The air outlet direction of the air inlet pipe (12) faces the baffle plate (4). The baffle plate (4) is provided with a breathable structure arranged in rows and columns.
5. The device for evaporating wastewater using hot gas as claimed in claim 1, wherein: A heat insulation layer is also provided on the inner wall or the outer wall of the box body (1).
6. The device for evaporating wastewater using hot gas as claimed in claim 1, wherein: The air inlet pipe (12) and the exhaust pipe (13) are respectively located on opposite sides of the box body (1).
7. The device for evaporating wastewater using hot gas according to any one of claims 1 to 6, characterized in that: The outer contour of the box body (1) is a cuboid. The four vertical surfaces of the cuboid are respectively the front, back, left and right sides of the box body (1). The entire front surface of the box body (1) is provided with openings and a box door (11) is set. A chute is respectively fixedly arranged on the inner sides of the left and right sides of the box body (1). The chute is horizontally arranged. Two parallel cross bars (21) are fixed at the top of the waste water hopper (2). Rollers (22) are respectively fixedly installed at both ends of the two cross bars (21). The rollers (22) at both ends of the two cross bars (21) are respectively placed in the two chutes of the box body (1).
8. The device for evaporating wastewater using hot air as claimed in claim 7, wherein: A channel steel (15) is respectively fixedly arranged on the inner sides of the left and right sides of the box body (1). The channel steel (15) forms a chute. One side of the box door (11) is hinged to the box body (1). A box door lock (16) is arranged between the box body (1) and the box door (11). A fixing pin (17) is arranged between the box body (1) and the waste water hopper (2).
9. Wet desulfurization wastewater evaporation treatment device, characterized in that: It includes a flue gas pipeline and at least one set of the device for evaporating waste water using hot gas according to any one of claims 1 to 8 above. When there is one set of the device for evaporating waste water using hot gas, the air inlet pipe (12) and the exhaust pipe (13) are respectively connected in parallel to two positions with pressure difference on the flue gas pipeline; when there are two sets or more sets of the device for evaporating waste water using hot gas, each set of the device for evaporating waste water using hot gas is connected in series through the air inlet pipe (12) and the exhaust pipe (13). The air inlet pipe (12) and the exhaust pipe (13) of the two sets of the device for evaporating waste water using hot gas located at the ends are respectively connected in parallel to two positions with pressure difference on the flue gas pipeline.
10. The wet desulfurization wastewater evaporation treatment device according to claim 9, characterized in that: It further includes a water pump and a waste water tank. The water inlet pipe (14) of the water pump is located in the waste water tank. The water outlet pipe of the water pump is respectively connected to each water inlet pipe (14), and control valves are respectively arranged on each water inlet pipe (14). A liquid level switch is arranged inside the waste water tank.