Low-temperature deodorization equipment for treating waste gas by using waste grease

Abstract

The utility model discloses low-temperature deodorization equipment for treating waste gas by using waste grease, which comprises an air extractor and a low-temperature treatment device, and the air inlet of the air extractor is communicated with treatment equipment of the waste grease; the low-temperature treatment device comprises a treatment pipe and a refrigerator, the treatment pipe comprises a pipe body, a low-temperature deodorization cavity is formed in the pipe body, the pipe body is communicated with the air outlet of the air extractor, and the refrigerator is connected with the pipe body to maintain the low-temperature environment of the low-temperature deodorization cavity. Compared with the prior art, the low-temperature deodorization equipment for treating the waste gas from the waste grease provided by the utility model has the advantages that a low-temperature environment is maintained by utilizing the refrigerator, and when low-molecular odor substances pass through, the odor substances are condensed and liquefied, so that the aim of deodorizing the treated waste gas is fulfilled.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a low-temperature deodorization device for treating waste oil waste gas. Background Technology

[0002] Waste oil crude biodiesel is a complex mixture of organic components with extremely high oxygen content. This mixture mainly consists of large molecular weight organic fatty acid esters, and also contains oxygen-containing organic compounds such as esters, ethers, aldehydes, ketones, phenols, organic acids, and alcohols. During the collection, storage, and transportation of waste oil raw materials, cadaverine (produced from protein putrefaction), low-molecular-weight fatty acid esters, fatty acids, fatty aldehydes, and fatty ketones (produced from oil hydrolysis, oxidation, and rancidity) are also mixed in. During its production process, high-temperature pyrolysis produces some low-carbon aldehydes and ketones with odorous gases. Combined with some residual methanol that has not been completely removed, this also produces a pungent odor. Most of this odor is absorbed by the water ring condenser in the vacuum pump, but some of the odorous gases are discharged as non-condensable gases. If left untreated, this will cause air pollution and create an unpleasant odor in the working environment.

[0003] Currently, in biodiesel production, the water ring vacuum pump outlet has a strong odor during the operation of the vacuum unit, which can easily cause malodor pollution. Especially when acrolein is present, when the concentration reaches 1 ppm in 1 m³ of air, people will tear up. This not only affects human health but also causes varying degrees of pollution to the surrounding environment.

[0004] Existing technologies typically employ methods such as alkaline washing, deodorizing spraying, and ultraviolet oxidation to treat gases, but the treatment effect is not significant, and odors are difficult to completely eliminate. In practical application, these methods have been found to lack specificity and have serious drawbacks, including increased equipment size, high production and operating costs, and low efficiency. Therefore, improvements are necessary.

[0005] Practical content

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a low-temperature deodorization device for waste oil treatment exhaust gas, thereby solving the technical problem that the deodorization effect of the malodorous exhaust gas generated from waste oil treatment in the existing technology is not ideal.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a low-temperature deodorization device for waste oil treatment exhaust gas, including: an exhaust device, the air inlet of which is connected to the waste oil treatment equipment; a low-temperature treatment device, which includes a treatment pipe and a cooler, the treatment pipe including a pipe body, a low-temperature deodorization chamber formed inside the pipe body, the pipe body being connected to the air outlet of the exhaust device, and the cooler being connected to the pipe body to maintain the low-temperature environment of the low-temperature deodorization chamber.

[0009] In some embodiments, the processing tube further includes a discharge pipe, a discharge valve, and a first liquid level sensor. The discharge pipe is connected to the bottom of the processing tube, the discharge valve is disposed on the discharge pipe, and the first liquid level sensor is disposed on the tube body to measure the liquid level height of the condensate in the tube body.

[0010] In some embodiments, the refrigeration unit includes a refrigerant pipe, an expansion valve, a refrigeration compressor, and a heat exchanger. The refrigerant pipe has an evaporator section, which is spirally arranged and wrapped around the pipe body. The evaporator, expansion valve, refrigeration compressor, and heat exchanger are arranged sequentially on the refrigerant pipe along the refrigerant flow direction.

[0011] In some embodiments, the processing tube further includes an insulation layer that covers the evaporator tube arrangement.

[0012] In some embodiments, the cooler further includes a temperature sensor and a first PLC processor. The temperature sensor is disposed in the low-temperature deodorization chamber and is connected to the first PLC controller for signal transmission. The first PLC controller is connected to the expansion valve for signal control.

[0013] In some embodiments, the outlet of the air extraction device is connected to the lower part of the pipe body, and the top of the pipe body is open; the refrigerant flows from top to bottom in the evaporator tube.

[0014] In some embodiments, the system further includes a buffer tank, a water ring vacuum pump as the pumping device, the outlet of the water ring vacuum pump being connected to the buffer tank, the top of the buffer tank being connected to a pipe, and the bottom of the buffer tank being connected to the inlet of the water ring vacuum pump via a liquid pipe.

[0015] In some embodiments, a plate heat exchanger is also included, which is disposed on the liquid pipe for cooling the liquid inside the liquid pipe.

[0016] In some embodiments, the system further includes a liquid extraction pump, a second liquid level sensor, and a second PLC controller. The inlet of the liquid extraction pump is connected to a liquid pipe. The second liquid level sensor is mounted on a buffer tank. The second liquid level sensor is connected to the second PLC controller via signal transmission. The second PLC controller is connected to the liquid extraction pump via signal control.

[0017] In some embodiments, the low-temperature environment is -28°C to -25°C.

[0018] Compared with existing technologies, the low-temperature deodorization equipment for waste oil treatment provided by this utility model utilizes a refrigerator to maintain a low-temperature environment. When low-molecular-weight odor substances pass through, the odor substances are condensed and liquefied, thereby achieving the purpose of deodorizing the treated waste gas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a low-temperature deodorization device for treating waste oil and grease exhaust gas provided in this utility model embodiment. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0021] To address the technical problem of unsatisfactory deodorization of odorous waste gas generated from waste oil treatment, this invention provides a low-temperature deodorization device for waste oil treatment waste gas. By liquefying odorous substances at low temperatures, it achieves simple and efficient deodorization of odorous waste gas.

[0022] It should be noted that the low-temperature deodorization equipment for waste oil treatment exhaust gas described in this utility model is applicable to, but not limited to, exhaust gas generated during waste oil treatment. For ease of explanation, this utility model only uses the low-temperature deodorization equipment for waste oil treatment exhaust gas deodorization as an example. The principle of the low-temperature deodorization equipment for waste oil treatment exhaust gas applied to other exhaust gas deodorization is essentially the same as the principle applied to the deodorization of exhaust gas generated during waste oil treatment, and will not be elaborated here.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of a low-temperature deodorization device for treating waste oil exhaust gas in one embodiment of the present invention. The low-temperature deodorization device for treating waste oil exhaust gas includes an exhaust device 1 and a low-temperature treatment device 2.

[0024] The air inlet of the exhaust device 1 is connected to the waste oil treatment equipment, and the air outlet is connected to the low-temperature treatment device 2. The exhaust device 1 is used to draw the waste gas generated by the waste oil treatment equipment into the low-temperature treatment device 2 for deodorization treatment, removing malodorous substances before discharging.

[0025] The cryogenic treatment device 2 includes a treatment pipe 21 and a cooler 22. The treatment pipe 21 includes a pipe body 211, which forms a cryogenic deodorization chamber. The pipe body 211 is connected to the outlet of the extraction device 1, allowing exhaust gas to pass through it. The cooler 22 is connected to the pipe body 211 to maintain the cryogenic environment of the deodorization chamber. When the exhaust gas passes through the pipe body 211, odorous substances condense into a liquid state, achieving separation from the exhaust gas and thus deodorizing it.

[0026] In some embodiments, the processing pipe 21 further includes a discharge pipe 212, a discharge valve 213, and a first liquid level sensor 214. The discharge pipe 212 connects to the bottom of the processing pipe 211, the discharge valve 213 is disposed on the discharge pipe 212, and the first liquid level sensor 214 is disposed on the pipe body 211 to measure the liquid level of the condensate inside the pipe body 211. The condensed odorous substances will collect at the bottom of the pipe body 211. When a certain amount has accumulated, the discharge valve 213 can be opened to discharge these odorous substances through the discharge pipe 212 for unified treatment. The liquid level sensor 214 is used to issue a discharge signal when the liquid level rises to a preset value, reminding the operator to handle the situation. The liquid level sensor 214 can take various forms, such as a collision switch or a pressure sensor.

[0027] In some embodiments, the refrigerator 22 includes a refrigerant pipe 221, an expansion valve 222, a refrigeration compressor 223, and a heat exchanger 224. The refrigerant pipe 221 is filled with refrigerant. The refrigerant pipe 221 has an evaporator section, which is spirally arranged and wound around the pipe body 21. The evaporator, expansion valve 222, refrigeration compressor 223, and heat exchanger 224 are arranged sequentially on the refrigerant pipe 221 along the refrigerant flow direction. The refrigeration compressor 223 drives the refrigerant to circulate within the refrigerant pipe 221. The refrigerant expands in volume within the evaporator, changing from a liquid to a gaseous state, absorbing heat and lowering the temperature inside the low-temperature deodorization chamber. Then, under the compression action of the refrigeration compressor 223, it changes from a gaseous state to a liquid state, increasing its own temperature. It is then cooled down in the heat exchanger to become a low-temperature liquid refrigerant, which then enters the evaporator to vaporize and absorb heat, repeating the above process.

[0028] In some embodiments, the processing tube 21 further includes an insulation layer 215, which covers the evaporator tube arrangement to reduce the heat absorbed by the evaporator tube from the external environment and improve the cooling efficiency of the cooler 22.

[0029] In some embodiments, the cooler 22 further includes a temperature sensor 225 and a first PLC processor 226. The temperature sensor 225 is disposed inside the low-temperature deodorization chamber and is used to measure the temperature inside the chamber. The temperature sensor 225 is connected to the first PLC controller 226 for signal transmission, and the first PLC controller 226 is connected to the expansion valve 222 for signal control. The first PLC controller 226 controls the opening degree of the expansion valve 222 based on the temperature data provided by the temperature sensor 225, thereby regulating the cooling power of the cooler 22. In this embodiment, the first PLC controller 226 can be a Rockwell 1756 series PLC module or a 1794 series PLC module.

[0030] In this embodiment, the low-temperature environment is -28℃ to -25℃. When the temperature drops to -28℃, the expansion valve 222 is closed; when the temperature rises to -25℃, the expansion valve 222 is opened, thereby maintaining the temperature inside the low-temperature deodorization chamber within the set range. In other embodiments, dynamic adjustment can also be used, achieving more precise adjustment by controlling the opening degree of the expansion valve 222.

[0031] In some embodiments, the outlet of the extraction device 1 is connected to the lower part of the pipe body 211, and the top of the pipe body 211 is open, allowing the exhaust gas to move upwards within the tank 211. Meanwhile, the refrigerant flows downwards within the evaporator tube, resulting in a counter-current flow of the exhaust gas and refrigerant, thus achieving a better cooling effect. It is easy to understand that the inlet of the pipe body 211 is positioned higher than the upper limit of the liquid level set by the temperature sensor 225, thereby preventing malodorous substances obtained from condensation from flowing out of the inlet of the pipe body 211.

[0032] In some embodiments, the air extraction device 1 employs a water ring vacuum pump. This high-temperature deodorization device also includes a buffer tank 3, the outlet of the water ring vacuum pump 1 is connected to the buffer tank 3, the top of the buffer tank 3 is connected to the horizontal pipe 212, and the bottom of the buffer tank 3 is connected to the liquid inlet of the water ring vacuum pump through the liquid pipe 4.

[0033] Buffer tank 3 stores a certain amount of buffer solution, typically water. The buffer solution is delivered to the water ring vacuum pump via liquid pipe 4, serving a sealing function. When the water ring vacuum pump is operating, the buffer solution is discharged from the outlet along with the gas and flows back into buffer tank 3. During this process, soluble and condensable substances in the exhaust gas dissolve in the buffer solution; only insoluble and non-condensable substances enter the high-temperature treatment unit 2 for high-temperature deodorization.

[0034] In some embodiments, the high-temperature deodorization device further includes a plate heat exchanger 5, which is disposed on the liquid pipe 4 for cooling the buffer solution inside the liquid pipe 4. The buffer solution also serves to cool the water ring vacuum pump during operation. The plate heat exchanger 5 is used to cool the buffer solution so that the temperature of the buffer solution flowing into the water ring vacuum pump does not exceed the upper limit, thereby maintaining a stable water ring thickness and temperature inside the water ring vacuum pump.

[0035] Because soluble and condensable substances in the exhaust gas dissolve in the buffer solution, the volume of the buffer solution gradually increases. Therefore, in some embodiments, this high-temperature deodorization device also includes a liquid extraction pump 6, a second liquid level sensor 7, and a second PLC controller 8. The inlet of the liquid extraction pump 6 is connected to the liquid pipe 4 or the buffer tank 3, and the liquid level sensor 7 is mounted on the buffer tank 3. The second liquid level sensor 7 is connected to the second PLC controller 8 for signal transmission, and the second PLC controller 8 is connected to the liquid extraction pump 6 for signal control. The second liquid level sensor 7 can adopt the same technical solution as the first liquid level sensor 214, and the second PLC controller 8 can adopt the same PLC module as the first PLC controller 28.

[0036] The second liquid level sensor 7 is used to monitor the liquid level in the buffer tank 3. The second PLC controller 8 is preset with upper and lower limits for the liquid level. When the liquid level detected by the second liquid level sensor 7 reaches the upper limit, the second PLC controller 8 controls the liquid extraction pump 6 to start, drawing buffer solution from the buffer tank 3, causing the buffer solution level in the buffer tank 3 to drop. When the second liquid level sensor 7 detects that the liquid level has dropped to the lower limit, the second PLC controller 8 controls the liquid extraction pump 6 to stop. In this way, the amount of buffer solution in the buffer tank 3 is maintained within a certain range, ensuring that the water ring vacuum pump can operate normally while preventing excessive buffer solution from flowing back into the water ring vacuum pump.

[0037] To better understand this utility model, the following will be combined with... Figure 1 The technical solution of this utility model is described in detail as follows: A water ring vacuum pump 1 draws the waste gas generated during waste oil treatment into a buffer tank 3. Soluble and condensable substances in the waste gas dissolve in the buffer solution, while insoluble and non-condensable substances enter the cryogenic treatment device 2. The low temperature liquefies the odorous substances, which collect at the bottom of the pipe 211 and are discharged through the discharge pipe 212. The odorless gas, after condensation treatment, is discharged from the top of the pipe 211.

[0038] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A low-temperature deodorization device for treating waste oil exhaust gas, characterized in that, include: An air extraction device, wherein the air inlet of the air extraction device is connected to a waste oil treatment device; A low-temperature treatment device includes a treatment tube and a cooler. The treatment tube includes a tube body, and a low-temperature deodorization chamber is formed inside the tube body. The tube body is connected to the outlet of the air extraction device. The cooler is connected to the tube body to maintain the low-temperature environment of the low-temperature deodorization chamber.

2. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 1, characterized in that, The processing tube also includes a discharge pipe, a discharge valve, and a first liquid level sensor. The discharge pipe is connected to the bottom of the processing tube, the discharge valve is disposed on the discharge pipe, and the first liquid level sensor is disposed on the tube body to measure the liquid level height of the condensate in the tube body.

3. The low-temperature deodorization equipment for treating waste oil exhaust gas according to claim 1, characterized in that, The refrigerator includes a refrigerant pipe, an expansion valve, a refrigeration compressor, and a heat exchanger. The refrigerant pipe has an evaporator section. The evaporator is spiral and wound around the pipe body. The evaporator, the expansion valve, the refrigeration compressor, and the heat exchanger are arranged sequentially on the refrigerant pipe along the refrigerant flow direction.

4. The low-temperature deodorization equipment for treating waste oil exhaust gas according to claim 3, characterized in that, The processing tube also includes an insulation layer, which covers the evaporation tube arrangement.

5. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 3, characterized in that, The cooler also includes a temperature sensor and a first PLC controller. The temperature sensor is located inside the low-temperature deodorization chamber. The temperature sensor is connected to the first PLC controller for signal transmission. The first PLC controller is connected to the expansion valve for signal control.

6. The low-temperature deodorization equipment for treating waste oil exhaust gas according to claim 3, characterized in that, The outlet of the air extraction device is connected to the lower part of the pipe body, and the top of the pipe body is open; the refrigerant flows from top to bottom in the evaporator tube.

7. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 1, characterized in that, It also includes a buffer tank, the pumping device is a water ring vacuum pump, the outlet of the water ring vacuum pump is connected to the buffer tank, the top of the buffer tank is connected to the pipe body, and the bottom of the buffer tank is connected to the inlet of the water ring vacuum pump through a liquid pipe.

8. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 7, characterized in that, It also includes a plate heat exchanger, which is disposed on the liquid pipe for cooling the liquid inside the liquid pipe.

9. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 7, characterized in that, It also includes a liquid extraction pump, a second liquid level sensor, and a second PLC controller. The inlet of the liquid extraction pump is connected to the liquid pipe. The second liquid level sensor is installed on the buffer tank. The second liquid level sensor is connected to the second PLC controller for signal transmission. The second PLC controller is connected to the liquid extraction pump for signal control.

10. The low-temperature deodorization equipment for treating waste oil and grease exhaust gas according to claim 1, characterized in that, The low-temperature environment is -28℃ to -25℃.

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