A biodiesel vacuum exhaust gas deodorization device

Abstract

This utility model relates to a biodiesel vacuum exhaust gas deodorization device, which includes a spray unit, a freezing treatment unit, an adsorption unit, and an incineration unit. The spray unit has a first exhaust gas inlet at its bottom and a first exhaust gas outlet at its top. The first exhaust gas outlet is connected to a second exhaust gas inlet at the top of the freezing treatment unit. The freezing treatment unit has a condensate outlet and a second exhaust gas outlet at its bottom. The second exhaust gas outlet is connected to a third exhaust gas inlet at the bottom of the adsorption unit. The adsorption unit has a third exhaust gas outlet at its top, which is connected to a fourth exhaust gas inlet at the bottom of the incineration unit. The incineration unit also has a fourth exhaust gas outlet at its top. This utility model employs a combined process of spraying, freezing treatment, adsorption, and incineration, effectively treating the odor from biodiesel vacuum exhaust gas to achieve emission standards, thus providing the necessary operating conditions for biodiesel plants.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology, and in particular to a biodiesel vacuum exhaust gas deodorization device. Background Technology

[0002] Currently, biodiesel production using waste animal and vegetable oils as raw materials, along with other auxiliary agents, produces high-concentration vacuum exhaust gas emitted from the vacuum pump. This high-concentration vacuum exhaust gas contains various inorganic odors and volatile organic compounds, and current deodorization processes are unlikely to completely eliminate this type of vacuum odor.

[0003] In addition to oxygen and nitrogen, the vacuum exhaust gas produced during biodiesel production contains a variety of complex odor molecules, such as ammonia, hydrogen sulfide, propane, isobutane, chloromethane, carbon tetrachloride, dodecanethiol, methanethiol, methanol, 2-pentene, 3-methylbutanone, acetone, 2-methylbutanal, formaldehyde, acetaldehyde, propionaldehyde, dimethyl sulfide, dimethyl disulfide, methyl propyl disulfide, methyl isopentyl disulfide, methyl oleate, dioctyl terephthalate, phenol, propane, and methylamine. These gases not only have a strong odor, but some also contain highly toxic or carcinogenic substances. Therefore, the standards for vacuum exhaust gas treatment are quite high, requiring the complete removal of harmful and odorous substances.

[0004] Traditional deodorization methods include spray washing, incineration, photocatalysis, and carbon adsorption, but these methods are all limited in their ability to effectively treat such complex vacuum exhaust gases.

[0005] The spray scrubbing method uses a fan to send odorous gases into a spray scrubbing tower, where the gases flow upwards. The tower contains multiple layers of packing material, with multiple spray nozzles evenly distributed in each layer. These nozzles spray water mixed with chemical deodorizing agents, ensuring thorough contact between the odorous gases and the water. This allows the odorous gases and harmful molecules in the gases to dissolve in the water or react chemically with the deodorizing agents, reducing the odor and toxicity.

[0006] CN102019133A discloses an odor environmental protection treatment device, which consists of a burner, a flame arrester, a gas storage tank, a scrubber, a collection tank, valves, and a heavy waste condensate pump. The device collects the gas-liquid mixture emitted by the vacuum pump of the pulping plant evaporation station into the collection tank. The gas-liquid mixture is separated in the collection tank. The liquid is discharged by the heavy waste condensate pump, and the odor is sent to the odor scrubber. After being scrubbed with spray water in the odor scrubber, the odor is sent to the odor storage tank for storage. The odor in the storage tank is sent to the odor burner for combustion. The spray water from the odor scrubber enters the collection tank and is discharged by the heavy waste condensate pump, merging with the heavy waste condensate from the evaporation station and entering the wastewater treatment system.

[0007] CN204799097U discloses an evaporative high-concentration odor treatment device, including an incineration chamber, an alkali absorption tower, and a tail gas absorption tower. The incineration chamber is equipped with a hot water device connected to a hot water pipe, which in turn connects to an evaporation station. The evaporation station is connected to the hot water device via a return pipe. The top of the alkali absorption tower is equipped with an alkali spray device. The incineration chamber is connected to the bottom of the alkali absorption tower via a pipe, and the top of the alkali absorption tower is connected to the bottom of the tail gas absorption tower via a pipe. The top of the tail gas absorption tower is equipped with an exhaust port. This device achieves multi-stage treatment of high-concentration odor through incineration in the incineration chamber, absorption in the absorption tower, and tail gas absorption tower, resulting in economical investment and meeting SO2 emission standards after flue gas treatment.

[0008] However, none of the existing technologies mentioned above can completely treat this vacuum exhaust gas. Most of the substances in this exhaust gas are poorly soluble in water, making them difficult to remove using traditional spray washing methods. Furthermore, the proportion of sulfur-containing substances is relatively high, and if incineration is used, the treated exhaust gas will still have the problem of excessive sulfur dioxide levels. Considering all these factors, treating this vacuum exhaust gas is extremely difficult.

[0009] Therefore, there is an urgent need for a new biodiesel vacuum exhaust deodorization device that can completely remove harmful and odorous substances. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention provides a biodiesel vacuum exhaust gas deodorization device. This device employs a combination of spraying, freezing, adsorption, and incineration processes to ensure that biodiesel vacuum exhaust gas treatment meets standards without generating secondary pollution.

[0011] To achieve this objective, the present invention adopts the following technical solution:

[0012] This utility model provides a biodiesel vacuum exhaust gas deodorization device, which includes a spray unit, a freezing treatment unit, an adsorption unit and an incineration unit.

[0013] The spray unit has a first exhaust gas inlet at the bottom and a first exhaust gas outlet at the top; the first exhaust gas outlet is connected to the second exhaust gas inlet at the top of the refrigeration unit.

[0014] The freezing unit is provided with a condensate outlet and a second exhaust gas outlet at the bottom; the second exhaust gas outlet is connected to the third exhaust gas inlet at the bottom of the adsorption unit.

[0015] The adsorption unit is provided with a third exhaust gas outlet at the top, which is connected to the fourth exhaust gas inlet at the bottom of the incineration unit; the incineration unit is also provided with a fourth exhaust gas outlet at the top.

[0016] This invention, by setting up a spray unit, a freezing treatment unit, an adsorption unit, and an incineration unit, and adopting a combined process of spraying, freezing treatment, adsorption, and incineration treatment, can ensure that the vacuum exhaust gas treatment of biodiesel meets the standards and does not produce secondary pollution, so that the treated odor can meet the national standards.

[0017] It should be noted that the biodiesel vacuum exhaust gas deodorization device of this utility model is not limited to treating biodiesel vacuum exhaust gas, but can also be applied to the treatment of various organic odors, including various organic waste treatments, chemical industry, rubber industry, petrochemical industry, electronics industry, pharmaceutical industry, coating industry, etc.

[0018] As a preferred embodiment of this invention, the spraying unit is provided with at least two filler layers; a spraying assembly is provided on the upper part of the filler layers.

[0019] As a preferred embodiment of this invention, the spray assembly includes uniformly distributed nozzles.

[0020] It should be noted that the number of nozzles is not specifically limited in this invention. Those skilled in the art can reasonably set the number of nozzles according to their needs, and no specific limit is set here.

[0021] As a preferred technical solution of this utility model, the top of the spray unit is provided with a demisting layer.

[0022] As a preferred technical solution of this utility model, the thickness of the filler layer is 500~750mm, such as 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0023] Preferably, the distance between the filler layer and the spray assembly is 300~500mm, such as 300mm, 350mm, 400mm, 450mm, 500mm, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0024] In this invention, the spraying liquid of the spraying unit includes an alkaline solution or an acidic solution; the alkaline solution includes a sodium hydroxide solution or a potassium hydroxide solution.

[0025] In this invention, the biodiesel vacuum exhaust gas enters the spray unit and comes into large-area contact with the spray liquid, thereby absorbing odor molecules such as ammonia and hydrogen sulfide that are dissolved in water or react with the spray liquid. The odorous gas, after passing through the packing layer, then enters the demister layer, where water mist and droplets are separated from the biodiesel vacuum exhaust gas, thus reducing the moisture content of the exhaust gas passing through the spray tower and alleviating the pressure on downstream processing. The possible reaction equations are as follows:

[0026] Sodium hydroxide reacts with hydrogen sulfide: H2S + 2NaOH → Na2S + 2H2O.

[0027] As a preferred technical solution of this utility model, the refrigeration unit includes a heat exchange device and a refrigeration device; the heat exchange device and the refrigeration device are connected through a refrigerant circulation pipeline.

[0028] As a preferred technical solution of this utility model, the heat exchange device is provided with a second exhaust gas inlet at the top and a condensate outlet at the bottom.

[0029] As a preferred technical solution of this utility model, the refrigerant circulates between the heat exchange device and the refrigeration device through the refrigerant circulation pipeline.

[0030] In this invention, the freezing temperature of the freezing unit is 25 to -150°C, such as 25°C, 15°C, 5°C, 0°C, -5°C, -10°C, -50°C, -100°C, -150°C, etc., but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0031] In this invention, after the exhaust gas passes through the refrigeration unit, its high-boiling-point odor molecules will condense into liquid and be discharged from the bottom condensate outlet of the heat exchanger. The remaining exhaust gas enters the next processing unit from the second exhaust gas inlet at the top of the heat exchange device. The high-boiling-point odor substances are discharged from the condensate outlet after condensation, which removes the high-boiling-point odor molecules from the odor gas, thereby achieving the deodorization effect.

[0032] As a preferred embodiment of this invention, the adsorption unit is provided with an adsorption layer.

[0033] In this invention, the adsorption layer is filled with any one or at least two of potassium permanganate, alumina, activated carbon, charcoal, and volcanic rock. Typical but non-limiting examples of such combinations include potassium permanganate and alumina, alumina and activated carbon, activated carbon and charcoal, and charcoal and volcanic rock.

[0034] In this invention, the adsorption unit is equipped with an adsorption layer. The strong oxidizing substance filled in the adsorption layer chemically reacts with stubborn odor components in the exhaust gas, achieving removal. The activated carbon adsorption layer in the adsorption unit consists of many very fine carbon particles. These particles contain a large number of even smaller capillaries with strong adsorption capacity. Furthermore, the activated carbon has a large surface area, making it easy for odor molecules in the vacuum exhaust gas to be adsorbed by the capillaries, thus achieving purification. Therefore, this adsorption unit can adsorb odor molecules with low boiling points and high sulfur content that are difficult to treat using other methods. The possible reaction equations are as follows:

[0035] The reaction of phenol with potassium permanganate: 3C6H5OH + 4KMnO4 = 3C6H4O2 + 4MnO2 + 4KOH + H2O;

[0036] Alkynes are oxidized by potassium permanganate to carboxylic acids and carbon dioxide: RC≡CH→R-COOH+CO2.

[0037] In this invention, the incineration temperature of the incineration unit is 100~1200℃, such as 100℃, 200℃, 400℃, 600℃, 800℃, 1000℃, 1200℃, etc., but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0038] In this invention, the incineration process of the incineration unit includes any one of open flame incineration, RTO incineration, RCO incineration, and TO incineration.

[0039] In this invention, after the exhaust gas is treated by the spray unit, the refrigeration unit, and the adsorption unit, a small amount of extremely difficult-to-treat organic odor molecules still remain. Therefore, a high-temperature incineration method is required for further treatment. The incineration temperature can reach over 800℃, which can thoroughly remove odorous or toxic gases from the vacuum exhaust gas. Simultaneously, because the organic molecules containing sulfur and nitrogen have been removed after the multi-stage pretreatment, incineration will not produce sulfur dioxide or nitrogen oxides, ensuring that the odor and toxic molecules in the discharged exhaust gas are completely treated, thereby meeting the national emission standards.

[0040] The general equation for the combustion of organic molecules is: C n H m +(n+m / 4)O2→nCO2+(m / 2)H2O.

[0041] As a preferred technical solution of this utility model, the biodiesel vacuum exhaust gas deodorization device includes a spray unit, a freezing treatment unit, an adsorption unit and an incineration unit;

[0042] The spray unit has a first exhaust gas inlet at the bottom and a first exhaust gas outlet at the top; the first exhaust gas outlet is connected to the second exhaust gas inlet at the top of the refrigeration unit.

[0043] The spray unit is provided with at least two filler layers; a spray assembly is provided on the upper part of the filler layer; the spray assembly includes uniformly distributed nozzles; the thickness of the filler layer is 500~750mm; the distance between the filler layer and the spray assembly is 300~500mm; and a demisting layer is provided on the top of the spray unit.

[0044] The freezing unit is provided with a condensate outlet and a second exhaust gas outlet at the bottom; the second exhaust gas outlet is connected to the third exhaust gas inlet at the bottom of the adsorption unit.

[0045] The refrigeration unit includes a heat exchange device and a refrigeration device; the heat exchange device and the refrigeration device are connected by a refrigerant circulation pipeline; the heat exchange device is provided with a second exhaust gas inlet at the top and a condensate outlet at the bottom; the refrigerant circulates between the heat exchange device and the refrigeration device through the refrigerant circulation pipeline.

[0046] The adsorption unit is provided with a third exhaust gas outlet at the top, which is connected to the fourth exhaust gas inlet at the bottom of the incineration unit; the incineration unit is also provided with a fourth exhaust gas outlet at the top.

[0047] The adsorption unit is provided with an adsorption layer.

[0048] The operation method of the biodiesel vacuum exhaust gas deodorization device of this utility model includes the following:

[0049] The biodiesel vacuum exhaust gas enters from the first exhaust gas inlet at the bottom of the spray unit, passes through the packing layer, reacts with the spray liquid sprayed in the spray assembly, and then exits through the first exhaust gas outlet at the top of the spray unit, entering the refrigeration unit; the biodiesel vacuum exhaust gas enters the heat exchange device of the refrigeration unit, exchanges heat with the circulating refrigerant in the refrigeration device to cool down, and the generated condensate is discharged from the condensate outlet of the heat exchange device, and the remaining gas enters the adsorption unit through the second exhaust gas outlet of the refrigeration unit;

[0050] After the remaining gas passes through the adsorption layer of the adsorption unit, the third tail gas outlet of the adsorption unit enters the incineration unit; after incineration treatment by the incineration unit, the qualified tail gas is directly discharged.

[0051] Compared with the prior art, the present invention has at least the following beneficial effects:

[0052] (1) This utility model uses a freezing process to cool and condense the odor molecules in the exhaust gas into liquid, and then discharge them, thereby achieving the purpose of deodorization;

[0053] (2) This utility model can ensure that the vacuum exhaust gas treatment of biodiesel meets the standards through a combination of spraying, freezing, adsorption and incineration processes, and will not produce secondary pollution, so that the treated odor can meet the national standards. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of a biodiesel vacuum exhaust deodorization device provided by this utility model.

[0055] Figure 2 This is a process flow diagram of vacuum exhaust gas deodorization for biodiesel in this utility model.

[0056] Figure 3 This is a schematic diagram of the refrigeration unit of the biodiesel vacuum exhaust gas deodorization device in this utility model.

[0057] Figure 4 This is a schematic diagram of the adsorption unit of the biodiesel vacuum exhaust gas deodorization device in this utility model.

[0058] The components include: 1. Spray unit; 1-1. First exhaust gas inlet; 1-2. First exhaust gas outlet; 2. Refrigeration unit; 2-1. Second exhaust gas inlet; 2-2. Condensate outlet; 2-3. Second exhaust gas outlet; 3. Adsorption unit; 3-1. Third exhaust gas inlet; 3-2. Third exhaust gas outlet; 4. Incineration unit; 4-1. Fourth exhaust gas inlet; 4-2. Fourth exhaust gas outlet; 5. Packing layer; 6. Spray assembly; 7. Demisting layer; 8. Heat exchange device; 9. Refrigeration device; 10. Refrigerant circulation pipeline; 11. Adsorption layer. Detailed Implementation

[0059] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of this utility model and do not represent or limit the scope of protection of this utility model. The scope of protection of this utility model is determined by the claims.

[0060] Example 1

[0061] This embodiment provides a biodiesel vacuum exhaust gas deodorization device, and the specific composition of the biodiesel vacuum exhaust gas is shown in Table 1.

[0062] Table 1

[0063]

[0064] The biodiesel vacuum exhaust gas deodorization device includes a spray unit 1, a freezing treatment unit 2, an adsorption unit 3, and an incineration unit 4.

[0065] The spray unit 1 has a first exhaust gas inlet 1-1 at the bottom and a first exhaust gas outlet 1-2 at the top; the first exhaust gas outlet 1-2 is connected to the second exhaust gas inlet 2-1 at the top of the freezing treatment unit 2.

[0066] The spray unit 1 is provided with two packing layers 5; a spray assembly 6 is provided on the upper part of the packing layer 5; the spray assembly 6 includes uniformly distributed nozzles; the thickness of the packing layer 5 is 500mm; the distance between the packing layer 5 and the spray assembly 6 is 300mm; a demisting layer 7 is provided on the top of the spray unit 1; the spray liquid of the spray unit 1 is an alkaline solution; the alkaline solution is sodium hydroxide; after passing through the spray unit 1, the water-soluble odor components in the biodiesel vacuum exhaust gas are removed, as shown in Table 2:

[0067] Table 2

[0068]

[0069] The bottom of the freezing unit 2 is provided with a condensate outlet 2-2 and a second exhaust gas outlet 2-3; the second exhaust gas outlet 2-3 is connected to the bottom third exhaust gas inlet 3-1 of the adsorption unit 3.

[0070] The refrigeration unit 2 includes a heat exchange device 8 and a refrigeration device 9; the heat exchange device 8 and the refrigeration device 9 are connected by a refrigerant circulation pipeline 10; the heat exchange device 8 is provided with a second exhaust gas inlet 2-3 at the top and a condensate outlet 2-2 at the bottom; the refrigerant circulates between the heat exchange device 8 and the refrigeration device 9 through the refrigerant circulation pipeline 10; the refrigeration temperature of the refrigeration unit 2 is -150℃; a schematic diagram of the refrigeration unit 2 is shown below. Figure 3 As shown in Table 3, after passing through the refrigeration unit 2, the high-boiling-point odor molecules in the biodiesel vacuum exhaust gas are condensed into liquid and thus removed.

[0071] Table 3

[0072]

[0073] The adsorption unit 3 is provided with a third exhaust gas outlet 3-1 at the top, and is connected to the fourth exhaust gas inlet 4-1 at the bottom of the incineration unit 4; the incineration unit 4 is also provided with a fourth exhaust gas outlet 4-2 at the top.

[0074] The adsorption unit 3 is provided with an adsorption layer 11; the adsorption layer 11 is filled with potassium permanganate and activated carbon; a schematic diagram of the adsorption unit 3 is shown below. Figure 4 As shown; the incineration temperature of the incineration unit 4 is 800℃; the incineration process of the incineration unit 4 is open flame incineration.

[0075] Example 2

[0076] This embodiment provides a biodiesel vacuum exhaust gas deodorization device, wherein the composition of the biodiesel vacuum exhaust gas is the same as that in Embodiment 1;

[0077] The biodiesel vacuum exhaust gas deodorization device includes a spray unit 1, a freezing treatment unit 2, an adsorption unit 3, and an incineration unit 4.

[0078] The spray unit 1 has a first exhaust gas inlet 1-1 at the bottom and a first exhaust gas outlet 1-2 at the top; the first exhaust gas outlet 1-2 is connected to the second exhaust gas inlet 2-1 at the top of the freezing treatment unit 2.

[0079] The spray unit 1 is provided with three filler layers 5; a spray assembly 6 is provided on the upper part of the filler layer 5; the spray assembly 6 includes uniformly distributed nozzles; the thickness of the filler layer 5 is 750 mm; the distance between the filler layer 5 and the spray assembly 6 is 500 mm; a demisting layer 7 is provided on the top of the spray unit 1; the spray liquid of the spray unit 1 is an alkaline solution; the alkaline solution is a potassium hydroxide solution.

[0080] The bottom of the freezing unit 2 is provided with a condensate outlet 2-2 and a second exhaust gas outlet 2-3; the second exhaust gas outlet 2-3 is connected to the bottom third exhaust gas inlet 3-1 of the adsorption unit 3.

[0081] The refrigeration unit 2 includes a heat exchange device 8 and a refrigeration device 9; the heat exchange device 8 and the refrigeration device 9 are connected by a refrigerant circulation pipeline 10; the heat exchange device 8 is provided with a second exhaust gas inlet 2-1 at the top and a condensate outlet 2-2 at the bottom; the refrigerant circulates between the heat exchange device 8 and the refrigeration device 9 through the refrigerant circulation pipeline 10; the refrigeration temperature of the refrigeration unit 2 is 25°C.

[0082] The adsorption unit 3 is provided with a third exhaust gas outlet 3-2 at the top, and is connected to the fourth exhaust gas inlet 4-1 at the bottom of the incineration unit 4; the incineration unit 4 is also provided with a fourth exhaust gas outlet 4-2 at the top.

[0083] The adsorption unit 3 is provided with an adsorption layer 11; the adsorption layer 11 is filled with potassium permanganate and alumina; the incineration temperature of the incineration unit 4 is 1200℃; the incineration process of the incineration unit 4 is RTO incineration.

[0084] Comparative Example 1

[0085] This comparative example provides a biodiesel vacuum exhaust gas deodorization device. The only difference from Example 1 is that the refrigeration unit 2 is omitted, and the exhaust gas after passing through the spray unit 1 directly enters the adsorption unit 3 for adsorption treatment. All other devices and structures are the same as in Example 1.

[0086] In Comparative Example 1, the refrigeration unit 2 was omitted, and the high-boiling-point odor molecules in the exhaust gas could not be fully removed, resulting in the final exhaust gas not meeting national emission standards and thus being unable to be directly emitted.

[0087] Comparative Example 2

[0088] This comparative example provides a biodiesel vacuum exhaust gas deodorization device. The only difference from Example 1 is that the adsorption unit 3 is omitted, and the exhaust gas after passing through the refrigeration unit 2 directly enters the incineration unit 4 for incineration. All other devices and structures are the same as in Example 1.

[0089] In Comparative Example 2, the adsorption unit 3 was omitted, which resulted in the inability to fully remove stubborn odor components in the exhaust gas, causing the final exhaust gas to fail to meet national emission standards and thus be unable to be directly emitted.

[0090] Comparative Example 3

[0091] This comparative example provides a biodiesel vacuum exhaust deodorization device. The only difference from Example 1 is that the incineration unit 4 is omitted, and the exhaust gas after passing through the adsorption unit 3 is directly discharged. All other devices and structures are the same as in Example 1.

[0092] In Comparative Example 3, the incineration unit 4 was omitted, which resulted in the inability to fully remove the odorous organic molecules in the exhaust gas. Consequently, the exhaust gas emitted did not meet the national emission standards and could not be directly emitted.

[0093] In summary, this utility model provides a biodiesel vacuum exhaust gas deodorization device. By setting up a spray unit, a freezing treatment unit, an adsorption unit, and an incineration unit, and adopting a combination of spray, freezing, adsorption, and incineration treatment processes, this utility model can ensure that the biodiesel vacuum exhaust gas treatment meets the standards and does not produce secondary pollution, so that the treated odor gas can meet the national standards.

[0094] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A biodiesel vacuum exhaust gas deodorization device, characterized in that, The biodiesel vacuum exhaust gas deodorization device includes a spray unit, a freezing treatment unit, an adsorption unit, and an incineration unit; The spray unit has a first exhaust gas inlet at the bottom and a first exhaust gas outlet at the top; the first exhaust gas outlet is connected to the second exhaust gas inlet at the top of the refrigeration unit. The freezing unit is provided with a condensate outlet and a second exhaust gas outlet at the bottom; the second exhaust gas outlet is connected to the third exhaust gas inlet at the bottom of the adsorption unit. The adsorption unit is provided with a third exhaust gas outlet at the top, which is connected to the fourth exhaust gas inlet at the bottom of the incineration unit; the incineration unit is also provided with a fourth exhaust gas outlet at the top.

2. The biodiesel vacuum exhaust gas deodorization device according to claim 1, characterized in that, The spray unit is provided with at least two packing layers; a spraying component is provided on the upper part of the packing layers.

3. The biodiesel vacuum exhaust gas deodorization device according to claim 2, characterized in that, The spray assembly includes evenly distributed nozzles.

4. The biodiesel vacuum exhaust gas deodorization device according to claim 1, characterized in that, The top of the spray unit is provided with a demisting layer.

5. The biodiesel vacuum exhaust gas deodorization device according to claim 2, characterized in that, The thickness of the filler layer is 500~750mm.

6. The biodiesel vacuum exhaust gas deodorization device according to claim 2, characterized in that, The distance between the filler layer and the spray assembly is 300~500mm.

7. The biodiesel vacuum exhaust gas deodorization device according to claim 1, characterized in that, The refrigeration unit includes a heat exchange device and a refrigeration device; the heat exchange device and the refrigeration device are connected through a refrigerant circulation pipeline.

8. The biodiesel vacuum exhaust gas deodorization device according to claim 7, characterized in that, The heat exchange device is provided with a second exhaust gas inlet at the top and a condensate outlet at the bottom.

9. The biodiesel vacuum exhaust gas deodorization device according to claim 1, characterized in that, The adsorption unit is provided with an adsorption layer.

10. The biodiesel vacuum exhaust gas deodorization device according to claim 1, characterized in that, The biodiesel vacuum exhaust gas deodorization device includes a spray unit, a freezing treatment unit, an adsorption unit, and an incineration unit; The spray unit has a first exhaust gas inlet at the bottom and a first exhaust gas outlet at the top; the first exhaust gas outlet is connected to the second exhaust gas inlet at the top of the refrigeration unit. The spray unit is provided with at least two filler layers; a spray assembly is provided on the upper part of the filler layer; the spray assembly includes uniformly distributed nozzles; the thickness of the filler layer is 500~750mm; the distance between the filler layer and the spray assembly is 300~500mm; and a demisting layer is provided on the top of the spray unit. The freezing unit is provided with a condensate outlet and a second exhaust gas outlet at the bottom; the second exhaust gas outlet is connected to the third exhaust gas inlet at the bottom of the adsorption unit. The refrigeration unit includes a heat exchange device and a refrigeration device; the heat exchange device and the refrigeration device are connected through a refrigerant circulation pipeline; the heat exchange device is provided with a second exhaust gas inlet at the top and a condensate outlet at the bottom; The adsorption unit is provided with a third exhaust gas outlet at the top, which is connected to the fourth exhaust gas inlet at the bottom of the incineration unit; the incineration unit is also provided with a fourth exhaust gas outlet at the top. The adsorption unit is provided with an adsorption layer.

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