Protein feed extraction equipment

Abstract

The utility model relates to the technical field of protein feed extraction, in particular to protein feed extraction equipment. The embodiment of the utility model provides protein feed extraction equipment. The protein feed extraction equipment comprises a gas heating device, a protein feed extraction device and a tail gas treatment device, the gas heating device is used for heating cold air; the protein feed extraction device is communicated with the gas heating device and is used for heating the concentrated feed liquid to generate protein feed and tail gas; the tail gas treatment device comprises a cooling tank and a deodorization tower which are connected, the cooling tank is communicated with the protein feed extraction device and is used for cooling the tail gas, and the deodorization tower is used for deodorizing the tail gas. According to the protein feed extraction equipment provided by the invention, the content of volatile acid in tail gas can be reduced, so that the use of alkali liquor in the deodorization tower can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of protein feed extraction, in particular to a protein feed extraction device. Background Art

[0002] After biological fermentation and extraction of protein feed by spray drying, under such process conditions, gases with unpleasant acidic odors will be generated. If directly discharged without in-depth treatment, it will cause environmental protection problems. Therefore, how to completely remove the odor of the hot air tail gas after spray drying is of great importance. In related technologies, the gas is alkali-washed by a deodorization tower and discharged up to standard after neutralizing with acidic substances, but this treatment method requires a large amount of alkali solution. Summary of the Utility Model

[0003] This application provides a protein feed extraction device, which improves the technical problem that a large amount of alkali solution is required for alkali-washing the gas by a deodorization tower in related technologies.

[0004] An embodiment of this application provides a protein feed extraction device, including:

[0005] A gas heating device for heating cold air;

[0006] A protein feed extraction device communicated with the gas heating device for heating concentrated feed liquid to generate protein feed and tail gas;

[0007] A tail gas treatment device including a connected cooling tank and a deodorization tower. The cooling tank is communicated with the protein feed extraction device for cooling the tail gas, and the deodorization tower is used for deodorizing the tail gas.

[0008] In some embodiments, a cooling water inlet and a tail gas outlet are provided at the upper part of the cooling tank, a cooling water outlet and a tail gas inlet are provided at the lower part of the cooling tank. The cooling water inlet is used to introduce cooling water into the cooling tank, the tail gas inlet is used to introduce tail gas into the cooling tank so that the cooling water cools the tail gas, the cooling water outlet is used to discharge the cooling water, and the tail gas outlet is used to discharge the tail gas.

[0009] In some embodiments, the tail gas deodorization device further includes an external cooling component provided on the outer peripheral surface of the cooling tank for cooling the cooling tank.

[0010] In some embodiments, the external cooling component includes a plurality of cooling plates. The plurality of cooling plates are arranged at intervals along the axial direction of the cooling tank. The cooling plates are inclined relative to the cooling tank to form a water receiving groove with the cooling tank. The notch of the water receiving groove faces upward, and the water receiving groove can hold cooling water.

[0011] In some embodiments, the lowermost cooling plate is provided with a drain outlet.

[0012] In some embodiments, the cooling plate is disposed around the outer peripheral surface of the cooling tank.

[0013] In some embodiments, the protein feed extraction device includes a connected drying mechanism and a dehumidifying air conveying system. The drying mechanism is in communication with both the gas heating device and the tail gas treatment device. The drying mechanism is used to heat the concentrated liquid, and the dehumidifying air conveying system is used to dehumidify the protein feed.

[0014] In some embodiments, the drying mechanism includes a drying tower and a filtering component. The drying tower is in communication with the gas heating device, and the filtering component is in communication with the tail gas treatment device. The drying tower is used to heat the concentrated liquid, and the filtering component is used to filter the tail gas.

[0015] In some embodiments, a first induced draft fan is provided between the filtering component and the tail gas treatment device, and the first induced draft fan is in communication with the gas heating device.

[0016] In some embodiments, the gas heating device includes a blower, a flue gas heat exchanger, and a smoke heat exchanger that are connected in sequence. The smoke heat exchanger is in communication with the protein feed extraction device.

[0017] The beneficial effects of the present application are as follows:

[0018] In a protein feed extraction device provided by the present application, since the tail gas is cooled by the cooling tank before entering the deodorization tower, during this process, the saturated water in the tail gas will precipitate as the temperature of the tail gas decreases. At the same time, odorous organic substances such as volatile acids in the tail gas will also precipitate with the precipitation of the saturated water, so that the content of volatile acids in the tail gas is reduced, and thus the use of lye in the deodorization tower can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0020] Figure 1 It is a schematic structural diagram of a protein feed extraction device provided by an embodiment of the present application.

[0021] Figure 2 It is a schematic structural diagram of a cooling tank provided by an embodiment of the present application.

[0022] Description of the reference numerals:

[0023] 10 - Gas heating device, 20 - Protein feed extraction device, 30 - Tail gas treatment device, 100 - Cooling tank, 110 - Tank body, 111 - Cooling water inlet, 112 - Cooling water outlet, 113 - Flue gas inlet, 114 - Flue gas outlet, 120 - Tank bottom, 121 - Drain port, 130 - Cooling plate, 131 - Water receiving trough, 132 - Drainage port, 140 - Filler, 200 - Deodorization tower, 210 - Chimney, 300 - Drying mechanism, 310 - Drying tower, 320 - Filter assembly, 321 - Cyclone separator, 322 - Cloth bag collector, 400 - Dehumidifying air conveying system, 410 - Packing device, 500 - Blower, 600 - Steam heat exchanger, 700 - Flue gas heat exchanger, 710 - Hot blast stove, 800 - First induced draft fan, 900 - Second induced draft fan. Detailed implementation manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to Figure 1 , an embodiment of the present application provides a protein feed extraction device, which includes a gas heating device 10, a protein feed extraction device 20, and an exhaust gas treatment device 30. The gas heating device 10 is used to heat cold air; the protein feed extraction device 20 is connected to the gas heating device 10 and is used to heat the concentrated feed liquid to generate protein feed and exhaust gas; the exhaust gas treatment device 30 includes a connected cooling tank 100 and a deodorizing tower 200. The cooling tank 100 is connected to the protein feed extraction device 20 and is used to cool the exhaust gas, and the deodorizing tower 200 is used to deodorize the exhaust gas.

[0029] The gas heating device 10 is used to heat cold air to form hot air. The hot air enters the protein feed extraction device 20 to heat the concentrated feed liquid in the protein feed extraction device 20, so that the water in the concentrated feed liquid evaporates to generate protein feed with a water content < 10%, thereby realizing the extraction of dry protein feed. The concentrated feed liquid is the liquid concentrated by a disc centrifuge. During the evaporation of the concentrated feed liquid, at the same time, unpleasant acidic exhaust gas will be generated. The exhaust gas enters the cooling tank 100 for cooling, and then is deodorized by the deodorizing tower 200.

[0030] In the protein feed extraction device provided by the present application, since the exhaust gas is cooled by the cooling tank 100 before entering the deodorizing tower 200, during this process, the saturated water in the exhaust gas will precipitate as the temperature of the exhaust gas decreases, and at the same time, odorous organic substances such as volatile acids in the exhaust gas will also precipitate as the saturated water precipitates, so that the content of volatile acids in the exhaust gas decreases. When the exhaust gas enters the deodorizing tower 200, less alkali solution can be used to remove the acidic substances in the exhaust gas, thereby reducing the use of alkali solution in the deodorizing tower 200.

[0031] Of course, the exhaust gas treatment device 30 further includes a chimney 210. The deodorizing tower 200 is connected to the chimney 210, and the deodorized exhaust gas is discharged into the atmosphere through the chimney 210.

[0032] In some embodiments, please refer to Figure 2, a cooling water inlet 111 and a tail gas outlet 114 are provided at the upper part of the cooling tank 100, and a cooling water outlet 112 and a tail gas inlet 113 are provided at the lower part of the cooling tank 100. The cooling water inlet 111 is used to introduce cooling water into the cooling tank 100, and the tail gas inlet 113 is used to introduce tail gas into the cooling tank 100 so that the cooling water cools the tail gas. The cooling water outlet 112 is used to discharge the cooling water, and the tail gas outlet 114 is used to discharge the tail gas; the deodorizing tower is communicated with the tail gas outlet 114.

[0033] The cooling water inlet 111, the cooling water outlet 112, the tail gas inlet 113 and the tail gas outlet 114 are all communicated with the interior of the cooling tank 100. The cooling water inlet 111 is arranged at the upper part of the cooling tank 100, the cooling water outlet 112 is arranged at the lower part of the cooling tank 100, the tail gas inlet 113 is arranged at the lower part of the cooling tank 100, and the tail gas outlet 114 is arranged at the upper part of the cooling tank 100. Of course, in order to avoid mutual interference, the cooling water inlet 111 and the tail gas outlet 114 are arranged in a staggered manner, and the cooling water outlet 112 and the tail gas inlet 113 are arranged in a staggered manner.

[0034] Since the cooling water inlet 111 is used to introduce cooling water into the cooling tank 100, the tail gas inlet 113 is used to introduce tail gas into the cooling tank 100, the cooling water outlet 112 is used to discharge the cooling water, and the tail gas outlet 114 is used to discharge the tail gas, that is, the cooling water flows from top to bottom in the cooling tank 100, and the tail gas flows from bottom to top in the cooling tank 100. And during the process of the cooling water and the tail gas flowing in the cooling tank 100, heat exchange can be realized, so that the cooling water cools the tail gas. Thus, after the high-temperature tail gas enters the cooling tank 100 from the tail gas inlet 113 and is cooled by the cooling water, it is then discharged from the tail gas outlet 114. Since the deodorizing tower is communicated with the tail gas outlet 114, that is, before the tail gas enters the deodorizing tower, it is first cooled by the cooling tank 100. During this process, the saturated water in the tail gas will precipitate as the temperature of the tail gas decreases, and at the same time, the volatile acids and other odorous organic substances in the tail gas will also precipitate as the saturated water precipitates, so that the content of volatile acids in the tail gas decreases, and thus the use of the lye in the deodorizing tower can be reduced.

[0035] It should be noted that in order to avoid waste, the cooling water can be recycled. The cooling water inlet 111, the cooling water source and the cooling water outlet 112 are sequentially connected by pipelines to form a circulating water path. The cooling water source is a device for storing cooling water, and a circulating pump is provided on the pipeline to drive the cooling water to circulate in the circulating water path, so as to realize the recycling of the cooling water. That is, after the cooling water exchanges heat with the tail gas in the cooling tank 100, the tail gas with an increased temperature is then discharged through the cooling water outlet 112 and flows into the cooling water source for cooling. The cooled cooling water then enters the cooling tank 100 from the cooling water inlet 111, and this process is repeated to continuously cool the tail gas.

[0036] The deodorization tower is a commonly used waste gas treatment device. In the embodiments of this application, two-stage washing deodorization is adopted. The two-stage washing towers are respectively provided with circulating spray water tanks, and fresh water and alkali liquor can be used for water replenishment. During operation, the pH is not less than 8. The circulating spray water of the first-stage washing tower is equipped with a plate heat exchanger to ensure that the temperature of the circulating spray water is not more than 28°C. The number of spray layers of each tower in the second-stage washing tower is not less than 2 layers, and a demisting device is provided at the outlet of the final-stage washing tower. Among them, the second-stage washing tower uses fresh water and alkali liquor to control the pH ≥ 8. The secondary washing water enters the first-stage washing tower, and the washed tail gas is discharged through the exhaust pipe. Finally, the temperature of the tail gas is lower than 30°C, so as to remove most of the volatile acids and other odorous organic matters in the tail gas and achieve the purpose of deodorization.

[0037] In some embodiments, the cooling water inlet 111 and the cooling water outlet 112 are arranged on the side of the cooling tank 100; the tail gas inlet 113 is arranged on the side of the cooling tank 100, and the tail gas outlet 114 is arranged on the top of the cooling tank 100. Since the tail gas will rise vertically, the tail gas outlet 114 is arranged on the top of the cooling tank 100, which is convenient for the discharge of the tail gas.

[0038] In some embodiments, in order to improve the cooling effect on the tail gas, the tail gas deodorization device further includes an external cooling component, which is arranged on the outer peripheral surface of the cooling tank 100 and is used to cool the cooling tank 100.

[0039] After the cooling tank 100 is used for a long time, under the influence of the high temperature of the tail gas, the cooling tank 100 will also heat up, thus affecting the cooling effect on the tail gas. Therefore, an external cooling component is arranged on the outer peripheral surface of the cooling tank 100 to cool the cooling tank 100, which can improve the cooling effect and cooling efficiency on the tail gas.

[0040] In some embodiments, the external cooling component includes a plurality of cooling plates 130. The plurality of cooling plates 130 are arranged at intervals along the axial direction of the cooling tank 100. The cooling plates 130 are inclined relative to the cooling tank 100 to form a water receiving groove 131 between the cooling plates 130 and the cooling tank 100. The notch of the water receiving groove 131 faces upward, and the water receiving groove 131 can hold cooling water.

[0041] In the order from top to bottom, a plurality of water receiving tanks 131 are successively named as the first water receiving tank 131, the second water receiving tank 131, the third water receiving tank 131, and so on. By analogy, cooling water is continuously injected into the topmost first water receiving tank 131. After the cooling water in the first water receiving tank 131 is full, it will overflow and flow downward along the tank wall of the cooling tank 100 into the second water receiving tank 131. During this process, a part of the cooling tank 100 can be cooled. After the cooling water in the second water receiving tank 131 is full, it will overflow again and flow downward along the tank wall of the cooling tank 100 into the third water receiving tank 131. During this process, another part of the cooling tank 100 can be cooled. By analogy, as long as the cooling water is continuously injected into the first water receiving tank 131, the cooling of the cooling tank 100 can be achieved. Since the cooling plate 130 is inclined relative to the cooling tank 100, the cooling plate 130 will also provide a certain guiding direction for the flow of the cooling liquid. Specifically, the inclination angle of the cooling plate 130 can be 30° to 45°

[0042] In some embodiments, in order to properly dispose of the cooling water in the lowermost water receiving tank 131, the lowermost cooling plate 130 is provided with a drain port 132, that is, the cooling water flowing into the lowermost water receiving tank 131 can be directly discharged through the drain port. The drain port 132 can be connected to a drain pipe to introduce the cooling water to the destination.

[0043] In some embodiments, in order to ensure that the tank wall of the cooling tank 100 is fully cooled, the cooling plate 130 is arranged around the outer peripheral surface of the cooling tank 100, so as to ensure that the entire tank wall can be flowed through by the cooling water and achieve full cooling.

[0044] In some embodiments, in order to increase the contact area between the cooling water and the tail gas and improve the heat exchange efficiency, the tail gas deodorization device further includes a plurality of layers of packing 140. The plurality of layers of packing 140 are arranged in the cooling tank 100 and are spaced along the axial direction of the cooling tank 100. Specifically, the packing 140 can adopt corrugated plate packing 140.

[0045] In some embodiments, during the stage when the cooling tank 100 is not in use, when it is necessary to detect the cooling tank 100, the condensed water inside the cooling tank 100 needs to be drained first. Therefore, the bottom of the cooling tank 100 has an openable and closable sewage drain port 121. A valve is arranged on the sewage drain port 121. When using the cooling tank 100 to cool the tail gas, the valve is closed. When it is necessary to repair the cooling tank 100, the valve is opened to drain the condensed water in the cooling tank 100.

[0046] In some embodiments, the cooling tank 100 includes a tank body 110 and a tank bottom 120 provided on the tank body 110. A cooling water inlet 111, a cooling water outlet 112, a tail gas inlet 113, and a tail gas outlet 114 are all provided on the tank body 110. The tank bottom 120 has a guiding inclined surface, and a sewage outlet 121 is provided on the tank bottom 120. The guiding inclined surface can guide the discharge of condensed water to accelerate the discharge speed of the condensed water.

[0047] In some embodiments, please refer to Figure 1 , the protein feed extraction device 20 includes a connected drying mechanism 300 and a dehumidifying air conveying system 400. The drying mechanism 300 is in communication with both the gas heating device 10 and the tail gas treatment device 30. The drying mechanism 300 is used to heat the concentrated liquid, and the dehumidifying air conveying system 400 is used to dehumidify the protein feed.

[0048] The hot air generated by the gas heating device 10 enters the drying mechanism 300 to heat the concentrated liquid, thereby generating protein feed and tail gas. The generated protein feed enters the dehumidifying air conveying system 400 for dehumidification. The dehumidified protein feed enters the packing device 410 for packing, thus completing the extraction of the protein feed, and the tail gas enters the tail gas treatment device 30. The dehumidifying air conveying system 400 can be connected to the gas heating device 10, that is, part of the hot air can enter the dehumidifying air conveying system 400 to achieve the dehumidification of the protein feed.

[0049] In some embodiments, the drying mechanism 300 includes a drying tower 310 and a filtering component 320. The drying tower 310 is in communication with the gas heating device 10, and the filtering component 320 is in communication with the tail gas treatment device 30. The drying tower 310 is used to heat the concentrated liquid, and the filtering component 320 is used to filter the tail gas.

[0050] The concentrated liquid forms small droplets after being sprayed into the drying tower 310 and exchanges heat with the hot air in the drying tower 310 in a countercurrent manner, thereby instantly evaporating the moisture in the concentrated liquid to generate dry protein feed. Most of the dry powder falls into the bottom of the cone of the drying tower 310 and is discharged from the outlet at the bottom of the cone and enters the dehumidifying air conveying system 400. A small part of the dry powder enters the filtering component 320 along with the tail gas. In the filtering component 320, the dry powder is trapped and also falls into the dehumidifying air conveying system 400. The filtered tail gas then enters the tail gas treatment device 30. The filtering component 320 can include a cyclone separator 321 and a cloth bag collector 322.

[0051] In some embodiments, the gas heating device 10 includes a blower 500, a flue gas heat exchanger 600, and a smoke heat exchanger 700 that are connected in sequence. The smoke heat exchanger 700 is in communication with the protein feed extraction device 20.

[0052] The cold air first enters the steam heat exchanger 600 via the blower 500, exchanges heat with the steam, and the condensate is discharged. The preliminarily heat-exchanged cold air then enters the flue gas heat exchanger 700. The flue gas heat exchanger 700 is connected to the hot blast stove 710. The metallurgical gas in the hot blast stove 710 is used as the heat source, and the generated heat enters the flue gas heat exchanger 700 to further heat the cold air, thereby forming hot air that can be used to dry the concentrated feed liquid.

[0053] In some embodiments, a first induced draft fan 800 is provided between the filter assembly 320 and the tail gas treatment device 30, and the first induced draft fan 800 is connected to the gas heating device 10.

[0054] In the drying tower 310, hot air exchanges heat with the concentrated feed liquid to generate dried protein feed and tail gas. Since the heat of the hot air is not exhausted during the heat exchange process with the concentrated feed liquid, the remaining heat is mixed with the tail gas, so the temperature of the tail gas is also relatively high. To avoid wasting heat, the hot tail gas (about 120 °C) filtered by the filter assembly 320 is pressurized by the first induced draft fan 800 and then enters the gas heating device 10 to heat the cold air (this pipeline is not shown in the figure). During this process, the temperature of the tail gas drops to about 80 °C. Specifically, the first induced draft fan 800 is connected to the flue gas heat exchanger 700, that is, the hot tail gas enters the flue gas heat exchanger 700 to heat the cold air, thereby reducing the use of metallurgical gas in the hot blast stove 710.

[0055] A second induced draft fan 900 is also provided between the first induced draft fan 800 and the gas heating device 10. The tail gas after heat exchange in the flue gas heat exchanger 700 is pressurized by the second induced draft fan 900 and then enters the cooling tank 100 through the first induced draft fan 800 for further heat exchange. During this process, the temperature of the tail gas drops below 40 °C, the saturated water in the tail gas precipitates as the temperature of the tail gas decreases, and the volatile and odorous organic substances such as volatile acids in the hot air also precipitate with the precipitation of the saturated water, so the content of volatile acids in the tail gas decreases, and thus the use of alkali liquor in the deodorizing tower 200 can be reduced.

[0056] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A protein feed extraction device, characterized in that: include: A gas heating device for heating the cold air; A protein feed extraction device, connected to the gas heating device, for heating the concentrated feed liquid to generate protein feed and tail gas; The tail gas treatment device comprises a cooling tank and a deodorizing tower connected to each other. The cooling tank is connected to the protein feed extraction device and is used to cool the tail gas. The deodorizing tower is used to deodorize the tail gas.

2. The protein feed extraction equipment according to claim 1, characterized in that: The upper part of the cooling tank is provided with a cooling water inlet and an exhaust gas outlet, and the lower part of the cooling tank is provided with a cooling water outlet and an exhaust gas inlet. The cooling water inlet is used to pass cooling water into the cooling tank, and the exhaust gas inlet is used to pass exhaust gas into the cooling tank so that the cooling water cools the exhaust gas. The cooling water outlet is used to discharge cooling water, and the exhaust gas outlet is used to discharge exhaust gas.

3. The protein feed extraction equipment according to claim 1, characterized in that: The exhaust gas treatment device further includes an external cooling component, which is disposed on the outer peripheral surface of the cooling tank and is used to cool the cooling tank.

4. The protein feed extraction equipment according to claim 3, characterized in that: The external cooling assembly includes a plurality of cooling plates, which are spaced apart along the axial direction of the cooling tank. The cooling plates are tilted relative to the cooling tank to form a water receiving groove between the cooling tank, and the notch of the water receiving groove faces upward, and the water receiving groove can accommodate cooling water.

5. The protein feed extraction equipment according to claim 4, characterized in that: The cooling plate located at the bottom layer is provided with a drainage port.

6. The protein feed extraction equipment according to claim 4, characterized in that: The cooling plate is arranged around the outer peripheral surface of the cooling tank.

7. The protein feed extraction equipment according to any one of claims 1 to 6, characterized in that: The protein feed extraction device includes a connected drying mechanism and a dehumidification air delivery system. The drying mechanism is connected to the gas heating device and the tail gas treatment device. The drying mechanism is used to heat the concentrated feed liquid, and the dehumidification air delivery system is used to dehumidify the protein feed.

8. The protein feed extraction equipment according to claim 7, characterized in that: The drying mechanism includes a drying tower and a filtering assembly. The drying tower is connected to the gas heating device, and the filtering assembly is connected to the tail gas treatment device. The drying tower is used to heat the concentrated liquid, and the filtering assembly is used to filter the tail gas.

9. The protein feed extraction equipment according to claim 8, characterized in that: A first induced draft fan is provided between the filter assembly and the tail gas treatment device, and the first induced draft fan is communicated with the gas heating device.

10. The protein feed extraction equipment according to any one of claims 1 to 5, characterized in that: The gas heating device comprises a blower, a steam heat exchanger and a flue gas heat exchanger which are connected in sequence, and the flue gas heat exchanger is connected to the protein feed extraction device.

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