Voc waste gas recovery and reuse system coupled with metallurgical process

Abstract

The application provides a VOCs waste gas recycling system coupled with a metallurgical process, which comprises a washing unit, a water removal unit and a preheating unit which are sequentially connected. The washing unit is connected with a pharmaceutical and chemical VOCs waste gas pipeline, can remove acidic and alkaline substances in the VOCs waste gas, and washes the VOCs waste gas. The water removal unit can remove water at low temperature from the washed VOCs waste gas. The preheating unit can dry and preheat the VOCs waste gas from which water has been removed, and then deliver the VOCs waste gas to a combustion system of the metallurgical process through a conveying unit. The VOCs waste gas recycling system coupled with the metallurgical process can ensure the reuse of heat generated by the water removal unit, avoid waste of energy, and simultaneously avoid the problems of high construction cost, high operation cost and high maintenance cost caused by the use of a molecular sieve runner and RTO in the prior art, can realize recycling of VOCs waste gas, and has high practicability.

Description

Technical Field

[0001] This invention belongs to the technical field of VOCs waste gas treatment combined with metallurgical process, specifically involving a VOCs waste gas recovery and reuse system that can be coupled with metallurgical process. Background Technology

[0002] The VOCs waste gas generated by the pharmaceutical and chemical industry (pharmaceutical fermentation VOCs waste gas, pharmaceutical extraction VOCs waste gas, and chemical synthesis VOCs waste gas, etc.) contains a large amount of organic solvents. Direct emission of these gases causes significant pollution to the atmospheric environment. In addition, the VOCs waste gas has a strong odor, and direct emission of these gases will also cause great inconvenience to the production and life of surrounding residents.

[0003] In existing technologies, VOCs waste gas treatment typically employs combustion decomposition. This method involves pre-treating the VOCs waste gas to ensure its dryness and cleanliness, then using a molecular sieve rotor to adsorb and concentrate the VOCs. The concentrated VOCs waste gas is then transported to an RTO (Regenerative Thermal Oxidizer) for combustion decomposition before being released into the atmosphere. This treatment method is relatively thorough in treating VOCs waste gas, and the concentration and odor levels of the treated VOCs waste gas can meet national emission standards. However, this method suffers from high construction, operating, and maintenance costs (requiring frequent maintenance), as well as high labor costs and resource waste. Furthermore, the combustion of VOCs waste gas releases a large amount of heat, which is absorbed and cooled by low-temperature water, resulting in significant heat waste. The low-temperature water cooling process also adds substantial energy consumption and generates more carbon emissions. Summary of the Invention

[0004] This invention provides a VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, aiming to solve the problem of poor practicality caused by high cost and energy waste in existing VOCs waste gas treatment methods.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, including a washing unit, a water removal unit and a preheating unit arranged in sequence.

[0006] The washing unit is connected to the pharmaceutical and chemical VOCs waste gas pipeline and is used to remove acidic and alkaline substances in the VOCs waste gas and to wash the VOCs waste gas.

[0007] The dewatering unit is used to perform low-temperature dewatering on the washed VOCs waste gas.

[0008] The preheating unit is used to dry and preheat the pre-dehydrated VOCs waste gas, and then the VOCs waste gas is transferred to the combustion system of the metallurgical process through the conveying unit.

[0009] In one possible implementation, the washing unit includes:

[0010] The pickling tower has a first air inlet, a first air outlet and a first liquid outlet, and is used to remove alkaline substances from VOCs waste gas.

[0011] The alkaline scrubbing tower has a second air inlet, a second air outlet, and a second liquid outlet connected to the first air outlet, and is used to remove acidic substances from VOCs waste gas.

[0012] The water washing tower has a third air inlet connected to the second air outlet, a third air outlet connected to the water removal unit, and a third liquid outlet, and is used to remove a small amount of alkaline solution contained in VOCs waste gas.

[0013] In one possible implementation, the washing unit further includes:

[0014] The filter has three parts, and the inlets of the three filters are respectively connected to the first drain port, the second drain port and the third drain port. Each filter is used to filter the outgoing absorbent liquid.

[0015] The conditioning tank, connected to the outlets of the three filters, is used to mix the absorbent and adjust the pH of the mixed absorbent to neutral.

[0016] In one possible implementation, the water removal unit includes:

[0017] The cooling tower has a low-temperature inlet water pipe and a low-temperature return water pipe;

[0018] The water separator has a fourth air inlet and a fourth air outlet connected to the washing unit, a refrigerant inlet connected to the low-temperature water inlet pipe, a refrigerant outlet connected to the low-temperature water return pipe, and a cooling water outlet. The water separator is used to remove moisture carried by VOCs exhaust gas.

[0019] In one possible implementation, the water separator includes:

[0020] The housing has a cavity; the fourth air inlet and the cooling water outlet are both located at the bottom of the housing; the fourth air outlet is located at the top of the housing.

[0021] Multiple interception net groups are provided, and each interception net group is arranged at intervals along the vertical direction; each interception net group includes two filters arranged parallel to each other and at intervals along the vertical direction, and an auxiliary space is formed between the two filters; each filter is a semi-circular mesh sheet that bulges upward;

[0022] The water collection structure is provided in multiple groups, and each water collection structure is arranged in a one-to-one correspondence with each of the interception net groups; each group of water collection structures includes two water collection components, which are located at the two ends of the corresponding interception net group; each water collection structure and each interception net group divides the cavity to form an air outlet space, multiple air outflow spaces and an air inflow space arranged sequentially from top to bottom.

[0023] The unit has multiple coils, each corresponding to one of the auxiliary spaces. Each coil is arranged in a serpentine pattern in its corresponding auxiliary space. Both ends of each coil extend through the side wall of the housing. The ends of each coil extending from the side wall of the housing are connected end to end by pipes. The two ends of the assembly formed by each coil and the pipes are the refrigerant inlet and the refrigerant outlet, respectively.

[0024] In one possible implementation, each of the water collection components includes:

[0025] A horizontal plate is fixed in the cavity and connected to the lowest point of the two filters in the corresponding interception net group. The horizontal plate is provided with through holes.

[0026] A vertical cylinder is fixed to a horizontal plate along the vertical direction, and its top end communicates with the through hole;

[0027] A one-way outlet valve is located at the bottom end of the vertical cylinder to allow water to be discharged from the vertical cylinder.

[0028] In one possible implementation, the water separator further includes multiple cleaning structures, each corresponding to one of the interception net groups. Each cleaning structure includes:

[0029] A rotating shaft is rotatably mounted on the housing and is collinear with the axis of the corresponding interception net group;

[0030] The driver is fixed on the housing and is poweredly connected to the rotating shaft to drive the rotating shaft to reciprocate.

[0031] The pendulum is provided with multiple pendulum rods, each of which is spaced apart on the axis of the rotating shaft, and each pendulum rod is arranged radially along the rotating shaft;

[0032] A crossbar is arranged colinearly with the pivot and is fixedly connected to the extended end of each swing arm. A brush is provided at the end of the crossbar near the filter screen.

[0033] The drainage device is provided in two sets, with each set of drainage devices arranged horizontally on both sides of the rotating shaft; each set of drainage devices includes multiple traction ropes and a gravity bar; each traction rope is spaced apart along the axis of the rotating shaft, and its top end is fixedly connected to the rotating shaft; the gravity bar is arranged on the filter screen below and is connected to each of the traction ropes.

[0034] In one possible implementation, the preheating unit includes:

[0035] The heat exchanger has an air passage, and a heat medium pipeline is installed in the air passage;

[0036] A fan conveying device, connected to the heat exchanger, is used to send the preheated VOCs waste gas into the combustion system of the metallurgical process.

[0037] In this implementation, VOCs waste gas introduced from the pharmaceutical and chemical VOCs waste gas pipeline directly enters the scrubbing unit for washing to ensure the removal of acidic and alkaline substances carried in the VOCs waste gas. Subsequently, the VOCs waste gas enters the dehydration unit to remove moisture, and then passes through a preheating unit before being introduced into the combustion system of the metallurgical process. This method ensures the reuse of heat generated by the pre-dehydration unit, avoiding energy waste. Furthermore, this process system avoids the high construction, operating, and maintenance costs associated with previous methods using molecular sieve rotors and RTOs, enabling the recovery and reuse of VOCs waste gas and demonstrating strong practicality. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, provided in an embodiment of the present invention.

[0039] Figure 2 A cross-sectional schematic diagram of a water eliminator in a VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, provided in an embodiment of the present invention.

[0040] Figure 3 for Figure 2 A schematic diagram of the AA-direction structure of a VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, provided in the embodiment.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Washing unit; 11. Acid washing tower; 12. Alkali washing tower; 13. Water washing tower; 14. Filter; 15. Adjustment tank;

[0043] 20. Water removal unit; 21. Cooling tower; 22. Water separator; 221. Housing; 222. Filter screen; 223. Water collection structure; 2231. Horizontal plate; 2232. Vertical cylinder; 2233. One-way outlet valve; 224. Coil; 225. Fourth air inlet; 226. Cooling water outlet; 227. Fourth air outlet; 228. Cleaning structure; 2281. Shaft; 2282. Driver; 2283. Swing arm; 2284. Crossbar; 2285. Traction rope; 2286. Gravity bar;

[0044] 30. Preheating unit; 31. Heat exchanger; 32. Fan conveying device;

[0045] 40. Combustion system for metallurgical processes;

[0046] 50. VOCs exhaust gas pipelines in pharmaceutical and chemical industries. Detailed Implementation

[0047] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0048] Please see Figure 1 The present invention will now describe a VOCs waste gas recovery and reuse system that can be coupled with a metallurgical process. The VOCs waste gas recovery and reuse system that can be coupled with a metallurgical process includes a washing unit 10, a dehydration unit 20, and a preheating unit 30 arranged sequentially. The washing unit 10 is connected to a pharmaceutical and chemical VOCs waste gas pipeline 50, and can remove acidic and alkaline substances from the VOCs waste gas and wash the VOCs waste gas. The dehydration unit 20 can perform low-temperature dehydration on the washed VOCs waste gas. The preheating unit 30 can dry and preheat the pre-dehydrated VOCs waste gas, and then transfer the VOCs waste gas to the combustion system of the metallurgical process via a conveying unit.

[0049] The VOCs waste gas recovery and reuse system coupled to metallurgical processes provided in this embodiment, compared with existing technologies, allows VOCs waste gas introduced from the pharmaceutical and chemical VOCs waste gas pipeline 50 to directly enter the scrubbing unit 10 for scrubbing, ensuring the removal of acidic and alkaline substances carried in the VOCs waste gas. Subsequently, the VOCs waste gas enters the dehydration unit 20 to remove moisture, and then passes through the preheating unit 30 before being introduced into the combustion system of the metallurgical process. This method ensures the reuse of heat generated by the pre-dehydration unit 20, avoiding energy waste. Furthermore, this process system avoids the high construction, operating, and maintenance costs associated with previous methods using molecular sieve rotors and RTOs, achieving VOCs waste gas recovery and reuse with strong practicality.

[0050] It should be noted that the VOCs waste gas obtained in this embodiment can be directly used in the combustion system of the metallurgical process, including combustion air in the blast furnace, combustion air in the sintering machine, and combustion air in the rotary kiln.

[0051] In some embodiments, the washing unit 10 described above may employ, for example... Figure 1 The structure shown. See also Figure 1 The washing unit 10 includes an acid washing tower 11, an alkaline washing tower 12, and a water washing tower 13. The acid washing tower 11 has a first air inlet, a first air outlet, and a first liquid outlet, and is capable of removing alkaline substances from VOCs waste gas. The alkaline washing tower 12 has a second air inlet, a second air outlet, and a second liquid outlet connected to the first air outlet, and is capable of removing acidic substances from VOCs waste gas. The water washing tower 13 has a third air inlet connected to the second air outlet, a third air outlet connected to the water removal unit 20, and a third liquid outlet, and is capable of removing small amounts of alkaline solution contained in the VOCs waste gas.

[0052] The VOCs waste gas introduced through the pharmaceutical and chemical VOCs waste gas pipeline 50 typically contains acidic and alkaline substances. The acid washing tower 11, which can function as an absorption tower, contains dilute sulfuric acid as the absorbent, effectively removing alkaline substances as the VOCs waste gas passes through. The alkaline washing tower 12, also a absorption tower, contains dilute alkaline solution (sodium hydroxide), effectively removing acidic substances as the VOCs waste gas passes through. When the VOCs waste gas exits the alkaline washing tower 12, it carries some alkaline solution; therefore, a water washing tower 13 is used to further clean it, ensuring the cleanliness of the VOCs waste gas. This washing step can, to some extent, extend the service life of pipelines in subsequent processes.

[0053] In some embodiments, the washing unit 10 described above may employ, for example... Figure 1 The structure shown. See also Figure 1 The washing unit 10 also includes filters 14 and a regulating tank 15. There are three filters 14, with their inlets connected to the first drain port, the second drain port, and the third drain port, respectively. Each filter 14 can filter the discharged absorbent. The regulating tank 15 is connected to the outlets of the three filters 14, and can mix the absorbent and adjust the pH of the mixed absorbent to neutral.

[0054] Because the VOCs waste gas introduced into the pharmaceutical and chemical VOCs waste gas pipeline 50 contains particulate matter, which will directly enter the absorption liquid, multiple filters 14 are installed to ensure that the outgoing absorption liquid is filtered to remove particulate matter. At the same time, the filtrate is introduced into the regulating tank 15 to adjust the mixture to neutrality and avoid environmental pollution caused by emissions.

[0055] It should be noted that after the mixture in the regulating tank 15 is adjusted to neutral, it can be used as a dust suppression spray in the steel plant's raw material plant, realizing multiple uses of water and avoiding waste of water resources.

[0056] In some embodiments, the water removal unit 20 described above may employ, for example... Figures 1 to 2 The structure shown. See also Figures 1 to 2 The dewatering unit 20 includes a cooling tower 21 and a dewatering device 22. The cooling tower 21 has a low-temperature water inlet pipe and a low-temperature water return pipe. The dewatering device 22 has a fourth air inlet 225 and a fourth air outlet 227 connected to the scrubbing unit 10, a refrigerant inlet connected to the low-temperature water inlet pipe, a refrigerant outlet connected to the low-temperature water return pipe, and a cooling water outlet 226. The dewatering device 22 can remove moisture carried by VOCs exhaust gas.

[0057] Cooling tower 21 can provide cooling water to the water outlet to ensure that the moisture carried by the VOCs waste gas is separated during the process of passing through the water outlet, thus ensuring the dryness of the VOCs waste gas.

[0058] It should be noted that the cooling water outlet 226 in the water separator 22 can be directly connected to the regulating tank 15 through a pipeline to ensure the reuse of cooling water.

[0059] In some embodiments, the water separator 22 described above can be as follows: Figures 2 to 3 The structure shown. See also Figures 2 to 3 The water separator 22 includes a housing 221, a filter mesh assembly, a water collection structure 223, and a coil 224. The housing 221 has a cavity. The fourth air inlet 225 and the cooling water outlet 226 are both located at the bottom of the housing 221. The fourth air outlet 227 is located at the top of the housing 221. Multiple filter mesh assemblies are provided, spaced apart vertically. Each filter mesh assembly includes two parallel and spaced filters 222 arranged vertically, forming an auxiliary space between the two filters 222. Each filter 222 is an upwardly protruding semi-circular mesh. Multiple water collection structures 223 are provided, each corresponding to one of the filter mesh assemblies. Each water collection structure 223 includes two water collecting elements, located at opposite ends of the corresponding filter mesh assembly. The water collection structures 223 and the filter mesh assemblies divide the cavity into an air outlet space, multiple air venting spaces, and an air inlet space arranged sequentially from top to bottom. Multiple coils 224 are provided, and each coil 224 is set in a corresponding auxiliary space. Each coil 224 is arranged in a serpentine manner in the corresponding auxiliary space. Both ends of each coil 224 extend through the side wall of the housing 221. The ends of each coil 224 extending out of the side wall of the housing 221 are connected end to end by pipes. The two ends of each coil 224 and the pipes forming a combination are the refrigerant inlet and the refrigerant outlet, respectively.

[0060] Multiple interception mesh groups are installed inside the housing 221 to intercept VOCs exhaust gas in layers, thereby ensuring the dewatering effect of VOCs exhaust gas. Each interception mesh group has two filter screens 222 that can cover the coil 224, increasing the contact area with VOCs exhaust gas and preventing the temperature in the auxiliary space from being too low, thus ensuring the dewatering effect. In addition, the filter screen 222 is a semi-circular mesh, which further increases the contact area with VOCs exhaust gas and improves the dewatering effect. At the same time, the arc-shaped structure of the filter screen 222 ensures that water droplets condensed on its surface are guided to the two bottom positions by gravity, preventing water droplets from clogging the mesh. Two water collection structures 223 can collect water droplets flowing down from the top filter screen 222 at both ends of the filter screen 222.

[0061] In this embodiment, a distributor can be connected at the fourth air inlet 225. The distributor is located in the air intake space to ensure uniform airflow. This technology is existing technology and will not be described in detail here.

[0062] In some embodiments, the above-mentioned water collection element may be adopted as follows: Figure 2 The structure shown. See also Figure 2 Each water collection component includes a horizontal plate 2231, a vertical cylinder 2232, and a one-way outlet valve 2233. The horizontal plate 2231 is fixed in the cavity and connected to the lowest point of the two filter screens 222 in the corresponding interception mesh group. The horizontal plate 2231 has a through hole. The vertical cylinder 2232 is vertically mounted on the horizontal plate 2231, and its top end communicates with the through hole. The one-way outlet valve 2233 is located at the bottom end of the vertical cylinder 2232, allowing water inside the vertical cylinder 2232 to be discharged.

[0063] The horizontal plate 2231 provides support for the interception net assembly and also carries the flowing water, ensuring that the water can directly enter the cavity of the vertical cylinder 2232. The one-way outlet valve 2233 ensures that water is discharged once the water pressure inside the vertical cylinder 2232 reaches a certain level, while preventing VOCs exhaust gas from flowing directly through the vertical cylinder 2232, further ensuring the effective removal of VOCs exhaust gas.

[0064] In some embodiments, the water separator 22 described above can be as follows: Figures 2 to 3 The structure shown. See also Figures 2 to 3The water separator 22 also includes multiple cleaning structures 228, each corresponding to a specific interception net group. Each cleaning structure 228 includes a rotating shaft 2281, a driver 2282, a swing arm 2283, a crossbar 2284, and a diversion component. The rotating shaft 2281 is rotatably mounted on the housing 221 and is collinear with the axis of the corresponding interception net group. The driver 2282 is fixed to the housing 221 and is poweredly connected to the rotating shaft 2281 to drive the rotating shaft 2281 to reciprocate. Multiple swing arms 2283 are spaced along the axis of the rotating shaft 2281, and each swing arm 2283 is radially arranged along the rotating shaft 2281. The crossbar 2284 is collinear with the rotating shaft 2281 and is fixedly connected to the extended ends of each swing arm 2283. A brush is provided at the end of the crossbar 2284 near the filter screen 222. Two sets of drainage components are provided, each set arranged horizontally on both sides of the rotating shaft 2281. Each set of drainage components includes multiple traction ropes 2285 and a gravity bar 2286. The traction ropes 2285 are spaced apart along the axial direction of the rotating shaft 2281, and their top ends are fixedly connected to the rotating shaft 2281. The gravity bar 2286 is positioned on the lower filter screen 222 and connected to each traction rope 2285.

[0065] Water droplets condense on the surface of the lower filter screen 222 in each interception mesh group, and the water droplets condensed in the auxiliary space also act on the lower filter screen 222, resulting in a relatively large amount of water on the lower filter screen 222. To facilitate the rapid removal of water droplets from the filter screen 222, a cleaning structure 228 is adopted. The cleaning structure 228, through the reciprocating rotation of the rotating shaft 2281, drives the combination of the swing arm 2283 and the crossbar 2284 to swing back and forth, thereby causing the brush to continuously sweep the lower surface of the lower filter screen 222. This ensures that the condensed water droplets are directly swept to the two bottom ends of the filter screen 222, or guided to the rotating shaft 2281 by the combination of the swing arm 2283 and the crossbar 2284. This effectively ensures the cleanliness of the filter screen 222, prevents VOCs exhaust gas from continuing to carry moisture when passing through, and thus ensures the water removal effect.

[0066] The diversion components ensure that the water flow guided by the combination of the swing rod 2283 and the crossbar 2284 to the rotating shaft 2281 is diverted to flow to both ends of the lower intercepting net assembly. As the rotating shaft 2281 rotates, the traction ropes 2285 move, pulling the gravity bar 2286 up and down on the lower intercepting net assembly. This pushes the water droplets on the lower intercepting net assembly, ensuring that the water droplets condensed on the upper filter screen 222 of the lower intercepting net assembly quickly converge and flow to the horizontal plates 2231 at both ends. The structure is simple, has good linkage effect, and is highly practical.

[0067] In some embodiments, the preheating unit 30 described above may employ, for example... Figure 1The structure shown. See also Figure 1 The preheating unit 30 includes a heat exchanger 31 and a fan conveying device 32. The heat exchanger 31 has an air passage, within which a heat medium pipeline is installed. The fan conveying device 32 is connected to the heat exchanger 31 and can deliver the preheated VOCs waste gas into the combustion system of the metallurgical process.

[0068] The heat source for the heat exchanger 31 can be hot waste gas, such as the hot waste gas from the outlet of the third cooling section of a self-circulating cooler, or the hot waste gas from the outlet of a hot blast stove. The heat exchanger 31 ensures that the temperature of the VOCs waste gas is increased, providing sufficient preparation for subsequent combustion and combustion support, while also reducing the relative humidity of the VOCs waste gas. The gas can then be directly fed into the combustion system of the metallurgical process by a fan. The organic matter contained in the VOCs waste gas can be used directly as fuel, and the air, the main component of the VOCs waste gas, can be used as combustion air. The use of VOCs waste gas can reduce the fuel consumption of the metallurgical process combustion system 40, significantly reducing costs.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes, characterized in that, It includes a washing unit, a dewatering unit, and a preheating unit that are connected in sequence. The washing unit is connected to the pharmaceutical and chemical VOCs waste gas pipeline and is used to remove acidic and alkaline substances in the VOCs waste gas and to wash the VOCs waste gas. The dewatering unit is used to perform low-temperature dewatering on the washed VOCs waste gas. The preheating unit is used to dry and preheat the pre-dehydrated VOCs waste gas, and then transfer the VOCs waste gas to the combustion system of the metallurgical process through the conveying unit. The water removal unit includes: The cooling tower has a low-temperature inlet water pipe and a low-temperature return water pipe; The water separator has a fourth air inlet and a fourth air outlet connected to the washing unit, a refrigerant inlet connected to the low-temperature water inlet pipe, a refrigerant outlet connected to the low-temperature water return pipe, and a cooling water outlet. The water separator is used to remove moisture carried by VOCs exhaust gas. The water separator includes: The housing has a cavity; the fourth air inlet and the cooling water outlet are both located at the bottom of the housing; the fourth air outlet is located at the top of the housing. Multiple interception net groups are provided, and each interception net group is arranged at intervals along the vertical direction; each interception net group includes two filters arranged parallel to each other and at intervals along the vertical direction, and an auxiliary space is formed between the two filters; each filter is a semi-circular mesh sheet that bulges upward; The water collection structure is provided in multiple groups, and each water collection structure is arranged in a one-to-one correspondence with each of the interception net groups; each group of water collection structures includes two water collection components, which are located at the two ends of the corresponding interception net group; each water collection structure and each interception net group divides the cavity to form an air outlet space, multiple air outflow spaces and an air inflow space arranged sequentially from top to bottom. The unit has multiple coils, each coil corresponding to one of the auxiliary spaces. Each coil is arranged in a serpentine pattern in its corresponding auxiliary space. Both ends of each coil extend through the side wall of the housing. The ends of each coil extending from the side wall of the housing are connected end to end by pipes. The two ends of the assembly formed by each coil and the pipes are the refrigerant inlet and the refrigerant outlet, respectively. The water separator also includes cleaning structures, of which there are multiple cleaning structures, each corresponding to one of the interception net groups. Each cleaning structure includes: A rotating shaft is rotatably mounted on the housing and is collinear with the axis of the corresponding interception net group; The driver is fixed on the housing and is poweredly connected to the rotating shaft to drive the rotating shaft to reciprocate. The pendulum is provided with multiple pendulum rods, each of which is spaced apart on the axis of the rotating shaft, and each pendulum rod is arranged radially along the rotating shaft; A crossbar is arranged colinearly with the pivot and is fixedly connected to the extended end of each swing arm. A brush is provided at the end of the crossbar near the filter screen. The drainage device is provided in two sets, with each set of drainage devices arranged horizontally on both sides of the rotating shaft; each set of drainage devices includes multiple traction ropes and a gravity bar; each traction rope is spaced apart along the axis of the rotating shaft, and its top end is fixedly connected to the rotating shaft; the gravity bar is arranged on the filter screen below and is connected to each of the traction ropes.

2. The VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes as described in claim 1, characterized in that, The washing unit includes: The pickling tower has a first air inlet, a first air outlet and a first liquid outlet, and is used to remove alkaline substances from VOCs waste gas. The alkaline scrubbing tower has a second air inlet, a second air outlet, and a second liquid outlet connected to the first air outlet, and is used to remove acidic substances from VOCs waste gas. The water washing tower has a third air inlet connected to the second air outlet, a third air outlet connected to the water removal unit, and a third liquid outlet, and is used to remove a small amount of alkaline solution contained in VOCs waste gas.

3. The VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes as described in claim 2, characterized in that, The washing unit also includes: The filter has three parts, and the inlets of the three filters are respectively connected to the first drain port, the second drain port and the third drain port. Each filter is used to filter the outgoing absorbent liquid. The conditioning tank, connected to the outlets of the three filters, is used to mix the absorbent and adjust the pH of the mixed absorbent to neutral.

4. The VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes as described in claim 1, characterized in that, Each of the aforementioned water collection components includes: A horizontal plate is fixed in the cavity and connected to the lowest point of the two filters in the corresponding interception net group. The horizontal plate is provided with through holes. A vertical cylinder is fixed to a horizontal plate along the vertical direction, and its top end communicates with the through hole; A one-way outlet valve is located at the bottom end of the vertical cylinder to allow water to be discharged from the vertical cylinder.

5. The VOCs waste gas recovery and reuse system that can be coupled with metallurgical processes as described in claim 1, characterized in that, The preheating unit includes: The heat exchanger has an air passage, and a heat medium pipeline is installed in the air passage; A fan conveying device, connected to the heat exchanger, is used to send the preheated VOCs waste gas into the combustion system of the metallurgical process.

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