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

Abstract

The invention 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 invention, 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] The invention relates to the technical field of waste gas treatment, and in particular to a low-temperature deodorizing device for treating waste gas from waste grease. Background Art

[0002] Crude biodiesel from waste oil is a mixture of complex organic components with extremely high oxygen content. These mixtures are mainly organic fatty acid esters with large molecular weight, and also carry oxygen-containing organic matter, such as esters, ethers, aldehydes, ketones, phenols, organic acids, alcohols, etc. When waste oil raw materials are collected, stored and transported, cadaverine substances produced by protein corruption, low molecular fatty acid esters, fatty acids, fatty aldehydes, fatty ketones and other substances produced by oil hydrolysis, oxidation and rancidity are also carried in. During its production process, high-temperature cracking will produce some low-carbon aldehydes and ketones and other odor gases, plus some residual methanol that has not been completely removed, which also has a pungent odor. Most of the odor entering the vacuum pump is condensed and absorbed by the water ring, but a part of the odor is discharged in the form of non-condensable gas. If it is not treated, it will cause air pollution and the working environment will also have an unpleasant odor.

[0003] At present, in the production of biodiesel, the odor at the outlet of the water ring vacuum pump during the operation of the vacuum unit is very strong, which can easily cause odor pollution, especially when acrolein is present. When the concentration reaches 1PPm in 1m³ of air, people will shed tears, which not only affects human health, but also causes varying degrees of pollution to the surrounding environment.

[0004] In the prior art, alkaline washing, deodorizing spraying, ultraviolet oxidation and other methods are usually used to treat the gas, but the treatment effect is not significant and the odor is difficult to eliminate completely. In the actual use of the above methods, it is found that they lack pertinence and have serious defects, such as equipment expansion, high production and operation costs, and low efficiency. Therefore, they must be improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a low-temperature deodorization device for waste oil treatment waste gas, so as to solve the technical problem that the deodorization effect of the malodorous waste gas generated by waste oil treatment in the prior art is not ideal.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a low-temperature deodorization device for treating waste gas from waste grease, comprising: an exhaust device, the air inlet of the exhaust device is connected to the waste grease treatment device; a low-temperature treatment device, 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 connected to the air outlet of the exhaust device, and the refrigerator is connected to the pipe body to maintain a low-temperature environment of the low-temperature deodorization cavity.

[0007] In some embodiments, 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 arranged on the discharge pipe, and the first liquid level sensor is arranged on the tube body to measure the liquid level height of the condensate in the tube body.

[0008] In some embodiments, the refrigerator includes a refrigerant pipe, an expansion valve, a refrigeration compressor and a heat exchanger. The refrigerant pipe has an evaporator tube, which is spirally arranged and wrapped around the tube body. The evaporator tube, the expansion valve, the refrigeration compressor and the heat exchanger are arranged in sequence on the refrigerant pipe along the refrigerant flow direction.

[0009] In some embodiments, the processing tube further comprises an insulation layer, the insulation layer covering the evaporation tube arrangement.

[0010] In some embodiments, the refrigerator further includes a temperature sensor and a first PLC processor. The temperature sensor is disposed in 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.

[0011] In some embodiments, the air outlet of the air extraction device is connected to the lower part of the tube body, and the top end of the tube body is open; the refrigerant flows from top to bottom in the evaporating tube.

[0012] In some embodiments, a buffer tank is also included, the air extraction device is a water ring vacuum pump, the air 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 liquid inlet of the water ring vacuum pump through a liquid pipe.

[0013] In some embodiments, a plate heat exchanger is also included, and the plate heat exchanger is arranged on the liquid pipe to cool the liquid in the liquid pipe.

[0014] In some embodiments, it also includes a liquid production pump, a second liquid level sensor and a second PLC controller. The inlet of the liquid production pump is connected to the liquid pipe. The second liquid level sensor is arranged 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 production pump for signal control.

[0015] In some embodiments, the low temperature environment is -28°C to -25°C.

[0016] Compared with the prior art, the low-temperature deodorization equipment for waste oil treatment waste gas provided by the present invention utilizes a refrigerator to maintain a low-temperature environment, and condenses and liquefies the low-molecular odorous substances when they pass through, thereby achieving the purpose of deodorizing the treated waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a low-temperature deodorization device for treating waste gas from waste grease provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of unsatisfactory deodorization effect of malodorous waste gas generated by waste grease treatment, the present invention provides a low-temperature deodorization equipment for waste grease treatment waste gas, which liquefies malodorous substances at low temperature to achieve simple and efficient deodorization of malodorous waste gas.

[0020] It should be noted that the low-temperature deodorization equipment for waste oil treatment waste gas described in the present invention is used for but not limited to waste gas generated during waste oil treatment, etc. For the convenience of explanation, in the present invention, only the deodorization of waste gas generated during waste oil treatment by the low-temperature deodorization equipment for waste oil treatment is described as an example, and the principle of applying the low-temperature deodorization equipment for waste oil treatment waste gas to other waste gases is essentially the same as the principle applied to the deodorization of waste gas generated during waste oil treatment, which will not be repeated here.

[0021] See also Figure 1 , Figure 1 It is a schematic structural diagram of a low-temperature deodorization device for waste oil and grease treatment waste gas in one embodiment of the present invention. The low-temperature deodorization device for waste oil and grease treatment waste gas comprises an exhaust device 1 and a low-temperature treatment device 2.

[0022] The air inlet of the air extraction device 1 is connected to the waste grease treatment equipment, and the air outlet is connected to the low temperature treatment device 2. The air extraction device 1 is used to extract the waste gas generated by the waste grease treatment equipment 1 into the low temperature treatment device 2 for deodorization treatment, and then discharge it after removing the malodorous substances.

[0023] The low temperature treatment device 2 includes a treatment tube 21 and a refrigerator 22. The treatment tube 21 includes a tube body 211. A low temperature deodorization chamber is formed in the tube body 211. The tube body 211 is connected to the gas outlet of the exhaust device 1, and the exhaust gas can pass through the tube body 211. The refrigerator 22 is connected to the tube body 211 to maintain the low temperature environment of the low temperature deodorization chamber. When the exhaust gas passes through the tube body 211, the odorous substances are condensed into liquid, and separated from the exhaust gas, thereby achieving the purpose of deodorizing the exhaust gas.

[0024] In some embodiments, the processing tube 21 further includes a discharge tube 212, a discharge valve 213 and a first liquid level sensor 214. The discharge tube 212 is connected to the bottom of the processing tube 211, the discharge valve 213 is arranged on the discharge tube 212, and the first liquid level sensor 214 is arranged on the tube body 211 to measure the liquid level height of the condensate in the tube body 211. The condensed malodorous substances will gather at the bottom of the tube body 211. When a certain amount is accumulated, the discharge valve 213 can be opened to discharge these malodorous substances through the discharge tube 212, and they can be collected and processed uniformly. The liquid level sensor 214 is used to send a discharge signal when the liquid level rises to a preset value. Remind the operator to handle. The liquid level sensor 214 can be in various forms, such as a collision switch, a pressure sensor, etc.

[0025] In some embodiments, the refrigerator 22 includes a refrigerant pipe 221, an expansion valve 222, a refrigeration compressor 223 and a heat exchanger 224, and the refrigerant pipe 221 is filled with refrigerant. The refrigerant pipe 221 has a section of evaporation pipe, which is spiral and arranged around the pipe body 21. The evaporation pipe, the expansion valve 222, the refrigeration compressor 223 and the heat exchanger 224 are arranged on the refrigerant pipe 221 in sequence along the flow direction of the refrigerant. The refrigeration compressor 223 drives the refrigerant to circulate in the refrigerant pipe 221, and the refrigerant expands in volume in the evaporation pipe, changes from liquid to gas, absorbs heat and lowers the temperature in the low-temperature deodorization cavity. Then, under the compression of the refrigeration compressor 223, it changes from gas to liquid, its own temperature rises, and then it is cooled in the heat exchanger to become a low-temperature liquid refrigerant, and then enters the evaporation pipe to gasify and absorb heat, and the above process is repeated.

[0026] In some embodiments, the processing tube 21 further includes a heat preservation layer 215 , and the heat preservation layer 215 covers the evaporation tube arrangement to reduce the heat absorbed by the evaporation tube from the external environment and improve the cooling efficiency of the refrigerator 22 .

[0027] In some embodiments, the refrigerator 22 further includes a temperature sensor 225 and a first PLC processor 226. The temperature sensor 225 is disposed in the low-temperature deodorization chamber to measure the temperature in the low-temperature deodorization 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 of the expansion valve 222 according to the temperature data provided by the temperature sensor 225, thereby regulating the refrigeration power of the refrigerator 22. In this embodiment, the first PLC controller 226 can adopt Rockwell's 1756 series PLC module or 1794 series PLC module.

[0028] In this embodiment, the low temperature environment is -28°C to -25°C. When the temperature drops to -28°C, the expansion valve 222 is closed, and when the temperature rises to -25°C, the expansion valve 222 is opened, thereby maintaining the temperature in the low temperature deodorization chamber within the set range. In other embodiments, dynamic adjustment can also be used to achieve more precise adjustment by controlling the opening of the expansion valve 222.

[0029] In some embodiments, the air outlet of the air extraction device 1 is connected to the lower part of the tube body 211, and the top of the tube body 211 is open, so that the exhaust gas moves from bottom to top in the tank body 211. The refrigerant flows from top to bottom in the evaporating tube, and the exhaust gas and the refrigerant flow in reverse directions to obtain a better cooling effect. It is easy to understand that the position of the air inlet of the tube body 211 is higher than the upper limit of the liquid level set by the temperature sensor 225, so as to prevent the condensed odorous substances from flowing out of the air inlet of the tube body 211.

[0030] In some embodiments, the air extraction device 1 uses a water ring vacuum pump. The high-temperature deodorization equipment also includes a buffer tank 3, the air 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.

[0031] A certain amount of buffer solution, generally water, is stored in the buffer tank 3. The buffer solution is transported to the water ring vacuum pump through the liquid pipe 4 to play a sealing role. When the water ring vacuum pump is working, the buffer solution will be discharged from the gas outlet along with the gas and flow back to the buffer tank 3. In this process, the soluble and condensable substances in the exhaust gas will dissolve in the buffer solution, and only the insoluble and non-condensable substances will enter the high temperature treatment device 2 for high temperature deodorization treatment.

[0032] In some embodiments, the high temperature deodorization equipment further comprises a plate heat exchanger 5, which is arranged on the liquid pipe 4 and used to cool the buffer solution in the liquid pipe 4. The buffer solution also serves to cool the water ring vacuum pump when it is working. 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, so as to maintain a stable water ring thickness and temperature in the water ring vacuum pump.

[0033] Since the soluble substances and condensable substances in the exhaust gas will dissolve in the buffer solution, the volume of the buffer solution will gradually increase. Therefore, in some embodiments, the high-temperature deodorization equipment 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 arranged 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.

[0034] The second liquid level sensor 7 is used to monitor the liquid level height in the buffer tank 3. The second PLC controller 8 is pre-set with an upper limit value and a lower limit value of the liquid level. When the liquid level data detected by the second liquid level sensor 7 reaches the upper limit value, the second PLC controller 8 controls the liquid extraction pump 6 to start, extract the buffer solution from the buffer tank 3, and reduce the buffer solution level in the buffer tank 3. When the second liquid level sensor 7 detects that the liquid level has dropped to the lower limit value, 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 kept within a certain range, so that it can maintain the normal operation of the water ring vacuum pump and avoid excessive buffer solution from flowing back into the water ring vacuum pump.

[0035] In order to better understand the present invention, the following Figure 1 The technical solution of the present invention is described in detail: the water ring vacuum pump 1 draws the waste gas generated during the waste oil treatment into the buffer tank 3, the soluble substances and condensable substances in the waste gas are dissolved in the buffer solution, and the insoluble substances and non-condensable substances enter the low temperature treatment device 2. The low temperature liquefies the malodorous substances, which are collected at the bottom of the pipe body 211 and discharged through the discharge pipe 212. The odorless gas after condensation treatment is discharged from the top of the pipe body 211.

[0036] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

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

2. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 1 is 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 arranged on the discharge pipe. The first liquid level sensor is arranged on the tube body to measure the liquid level height of the condensate in the tube body.

3. The low-temperature deodorization equipment for waste oil treatment waste 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 pipe, which is spirally arranged and wrapped around the pipe body. The evaporator pipe, the expansion valve, the refrigeration compressor and the heat exchanger are arranged in sequence on the refrigerant pipe along the refrigerant flow direction.

4. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 3 is characterized in that: The processing tube also includes a thermal insulation layer, which covers the evaporation tube arrangement.

5. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 3, characterized in that: The refrigerator also includes a temperature sensor and a first PLC processor. The temperature sensor is arranged in 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 waste oil treatment waste gas according to claim 3, characterized in that: The air outlet of the air extraction device is connected to the lower part of the tube body, and the top end of the tube body is open; the refrigerant flows from top to bottom in the evaporating tube.

7. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 1, characterized in that: It also includes a buffer tank, the air extraction device is a water ring vacuum pump, the air 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 liquid inlet of the water ring vacuum pump through a liquid pipe.

8. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 7, characterized in that: It also includes a plate heat exchanger, which is arranged on the liquid pipe and is used to cool the liquid in the liquid pipe.

9. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 7, characterized in that: It also includes a liquid production pump, a second liquid level sensor and a second PLC controller. The inlet of the liquid production pump is connected to the liquid pipe. The second liquid level sensor is arranged 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 production pump for signal control.

10. The low-temperature deodorization equipment for waste oil treatment waste gas according to claim 1, characterized in that: The low temperature environment is -28°C to -25°C.

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