Animal fat extraction preheating equipment

Abstract

The utility model relates to the technical field of boiler heat energy recovery and energy conservation, in particular to energy-saving equipment for boiler heat recovery, which is applied to the previous process of animal fat extraction equipment and is used for preheating animal fat raw materials in advance. The equipment disclosed by the utility model is named as a raw material preheating pot, and is preheating equipment for extracting animal fat. The device comprises an extraction barrel, the upper surface of the extraction barrel is fixedly communicated with a feeding pipe, and the lower surface of the extraction barrel is fixedly communicated with a discharging port. The temperature of a boiler smoke outlet is higher than that of a heat conduction oil boiler outlet, high-temperature smoke exhausted by a boiler chimney is used as a heat source to preheat animal fat, serious thermal pollution caused by the fact that high-temperature gas is directly exhausted into air is avoided, recycling of resources is achieved, and negative effects on the environment are reduced. And heat transfer is performed through a single-line communication channel formed by the heat exchange channel and the heat exchange pipe, so that the problem of non-uniform temperature distribution is effectively avoided, and animal fat can be uniformly preheated.

Description

TECHNICAL FIELD

[0001] The utility model relates to animal fat extraction technical field, specifically, an animal fat extraction preheating equipment. BACKGROUND

[0002] With the continuous development of food, feed, chemical, pharmaceutical and other industries, the demand for animal fat continues to grow, animal fat can be used to make cakes, fried foods and other food processing, can give food unique taste and flavor, adding in the feed field is to increase the energy and palatability of feed, in the chemical field, can be used as raw material for producing soap, lubricating oil and other products, in the pharmaceutical field, certain animal fat has certain medicinal value, this extensive application demand promotes people to develop more efficient animal fat extraction equipment.

[0003] Chinese patent publication No. CN103289811B discloses a kind of full-automatic animal fat extraction equipment, belongs to animal oil extraction technical field, including stirring drum, heat conducting oil pipe, stirring mechanism and power mechanism, wherein, in the upper part of stirring drum is equipped with feeding door for the feeding of animal oil raw material, a plurality of lifting holes are arranged on stirring drum for lifting stirring drum, heat conducting oil pipe is arranged in circle and fixed in stirring drum, animal oil raw material is placed in stirring drum, stirring mechanism rotates and stirs animal oil, at the same time, heat conducting medium is loaded in heat conducting oil pipe to heat animal oil, through the double action of stirring and heating, animal oil raw material is uniformly distributed.

[0004] In the above-mentioned utility model, the heat conduction oil boiler heating device is used to heat the heat conduction oil pipe to transmit heat to the animal oil, and then the animal oil is heated. Only the heat transmitted by the boiler can be used. However, this method has some problems. First of all, a lot of time is needed to heat the animal fat to extract oil, which means that the energy needs to be supplied for a long time, resulting in serious energy consumption. During the process of transmitting heat to the heat conduction oil pipe, the heating device can only transmit heat to the position in contact with the heating device, which will cause heat loss of the boiler chimney of the heating device. SUMMARY

[0005] The utility model discloses a preheating energy-saving equipment preheating pot of boiler chimney heat recovery, to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the utility model provides an animal fat extraction preheating equipment, including the extraction bucket, the upper surface fixed communication of extraction bucket has the feed pipe, the lower surface fixed communication of extraction bucket has the discharge gate, the inside of extraction bucket is equipped with the stirring component for mixing the animal fat stirring, the extraction bucket is close to the top and the bottom all forms the heat exchange channel, and is equipped with the heat exchange pipe between two heat exchange channels, the heat exchange pipe is located in the inside chamber of extraction bucket close to the edge,

[0007] The heat exchange channel and the heat exchange pipe form a channel that connects the bottom, inside and top of the extraction bucket, which is used to receive the heat discharged from the boiler chimney and uniformly preheat the animal fat.

[0008] As a further improvement of the technical solution, the heat exchange channel includes at least an upper gas collection frame connected to the top of the heat exchange pipe, a lower gas collection frame connected to the bottom of the heat exchange pipe, an air inlet pipe fixedly connected to the inner wall of the lower gas collection frame, and an air outlet pipe fixedly connected to the inner wall of the lower gas collection frame. The inner walls of the lower gas collection frame and the upper gas collection frame are each provided with four partitions, and the partitions are used to connect the areas divided by the lower gas collection frame and the upper gas collection frame to the heat exchange pipe.

[0009] As a further improvement of the technical solution, a plurality of air slots are formed in the top of the lower gas collection frame and are adapted to communicate with the bottom of the heat exchange pipe, and a plurality of air slots are formed in the bottom of the upper gas collection frame and are adapted to communicate with the top of the heat exchange pipe.

[0010] As a further improvement of the technical solution, a plurality of air slots are formed in the inner wall of the upper gas collection frame, two air slots are formed in the inner wall of the lower gas collection frame, and a transmission pipe is fixedly connected to the inner walls of the two air slots.

[0011] As a further improvement of the technical solution, a nano layer or a PTFE+PTFAB non-stick coating is provided on the surface of the heat exchange pipe to reduce the adhesion between the animal fat and the heat exchange pipe, thereby effectively preventing the fat from adhering to the surface of the heat exchange pipe.

[0012] As a further improvement of the technical solution, the stirring assembly includes a bottom bearing fixed to the top of the lower gas collection frame, a rotating shaft rotatably connected to the inner wall of the bottom bearing, and three stirring blades vertically and equally distributed on the surface of the rotating shaft, and the three stirring blades are equally distributed in a ring shape.

[0013] As a further improvement of the technical solution, a speed reducer is fixedly connected to the top of the rotating shaft, and the bottom of the speed reducer is fixedly connected to the top of the extraction bucket.

[0014] As a further improvement of the technical solution, the inner wall of the extraction barrel is provided with four supports, the bottom of two supports is in contact with the top of the lower gas collection frame, and the top of the other two supports is in contact with the bottom of the upper gas collection frame, and a plurality of round holes are formed in the surface of the supports, and the inner wall of the round holes is adapted to connect the surface of the heat exchange pipe.

[0015] As a further improvement of the technical solution, the inner wall of the extraction barrel is provided with four supports, the bottom of two supports is in contact with the top of the lower gas collection frame, and the top of the other two supports is in contact with the bottom of the upper gas collection frame, and a plurality of round holes are formed in the surface of the supports, and the inner wall of the round holes is adapted to connect the surface of the heat exchange pipe.

[0016] As a further improvement of the technical solution, the inner wall of the extraction barrel is provided with four supports, the bottom of two supports is in contact with the top of the lower gas collection frame, and the top of the other two supports is in contact with the bottom of the upper gas collection frame, and a plurality of round holes are formed in the surface of the supports, and the inner wall of the round holes is adapted to connect the surface of the heat exchange pipe.

[0017] Compared with the prior art, the animal fat extraction and preheating equipment has the following beneficial effects:

[0018] 1. In the animal fat extraction and preheating equipment, the boiler flue gas outlet temperature is higher than the outlet temperature of the heat conducting oil boiler, and the high temperature flue gas discharged from the boiler chimney is used as a heat source to preheat the animal fat, avoiding the direct discharge of high temperature gas into the air to cause serious thermal pollution, realizing the recycling of resources and reducing the negative impact on the environment.

[0019] 2. In the animal fat extraction and preheating equipment, heat is transferred through the single-line communication channel formed by the heat exchange channel and the heat exchange pipe, effectively avoiding the problem of uneven temperature distribution, so that the animal fat can be uniformly preheated, and the situation of partial over-preheating and partial under-preheating does not occur, thereby improving the efficiency and quality of subsequent animal fat extraction of oil. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an overall structure assembly diagram of the utility model;

[0021] Figure 2 It is a heat exchange channel structure split diagram of the utility model;

[0022] Figure 3 It is an overall frame diagram of the upper gas collection frame of the utility model;

[0023] Figure 4 It is an overall schematic diagram of the heat exchange pipe of the utility model;

[0024] Figure 5 It is a gas flow schematic diagram of the utility model;

[0025] Figure 6 It is a fixed device schematic diagram of the utility model;

[0026] Figure 7 It is a transmission pipeline structure schematic diagram of the utility model;

[0027] Figure 8 The utility model discloses a rotating shaft structure schematic diagram.

[0028] The meaning of each reference numeral in the drawing is as follows:

[0029] 100, extraction barrel;101, feed pipe;102, discharge port;

[0030] 200, heat exchange channel;210, upper gas collection frame;220, lower gas collection frame;221, air inlet pipe;222, air outlet pipe;223, partition;224, air passage;225, transmission pipeline;

[0031] 300, heat exchange pipe;310, support;320, fixing device;

[0032] 400, stirring assembly;410, speed reducer motor;411, rotating shaft;412, stirring blade;413, scraper;414, bottom bearing. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model. EMBODIMENT

[0034] Please refer to Figures 1-8 The utility model provides an animal fat extraction preheating equipment, including extraction barrel 100, the upper surface fixed communication of extraction barrel 100 has feed pipe 101, the lower surface fixed communication of extraction barrel 100 has discharge port 102, its characterized in that: the inside of extraction barrel 100 is equipped with the stirring assembly 400 for the animal fat mixing of stirring, and the extraction barrel 100 is formed with heat exchange channel 200 close to the top and bottom, and the heat exchange pipe 300 is arranged between two heat exchange channels 200, and the heat exchange pipe 300 is located in the inner chamber of extraction barrel 100 close to the edge;

[0035] The channel formed between the heat exchange channel 200 and the heat exchange pipe 300 is connected to the bottom, the inside and the top of the extraction barrel 100 in series, and the channel is used for receiving the heat discharged from the boiler chimney and uniformly preheating the animal fat.

[0036] As Figures 1-3 With Figure 7As shown, the utility model considers that the boiler flue gas outlet temperature is normally higher than the outlet temperature of the heat conducting oil boiler by 50 DEG, the boiler temperature is set to 250 DEG, and the flue gas emission temperature is 300 DEG, and the heating needs natural gas 70-90 / m3, if such high-temperature gas is directly discharged into the air, it will cause serious thermal pollution to the environment, therefore, utilize the high-temperature flue gas discharged from the boiler chimney as a heat source, connect it to the inside of the extraction bucket 100, realize the preheating of animal fat, reduce the thermal pollution to the environment, avoid the direct discharge of these waste heat to the atmosphere, realize the recycling of resources;

[0037] And consider that, if the boiler heat source is directly connected to the inside of the extraction bucket 100, the temperature of the part directly contacted with the heat source will be higher, and the temperature of the part not contacted with the heat source will be relatively low, under this uneven temperature distribution, it may cause that part of the animal fat is overheated, and another part is not preheated enough, thereby affecting the efficiency and quality of the subsequent animal fat oil extraction, therefore, the channel formed between the heat exchange channel 200 and the heat exchange pipe 300 in the extraction bucket 100 becomes an important path of heat transfer, heat flows in this channel, in this process, heat starts from the heat exchange channel 200 close to the bottom, is transmitted upwards along the heat exchange pipe 300, passes through the inside edge of the extraction bucket 100, reaches the heat exchange channel 200 close to the top, is transmitted downwards from the heat exchange pipe 300 connected to the top heat exchange channel 200 to the bottom heat exchange channel 200, forms single-line communication, so that the animal fat can be uniformly preheated, heat is transmitted through the single-line communication channel formed between the heat exchange channel 200 and the heat exchange pipe 300, which can effectively avoid the problem of uneven temperature distribution caused by directly connecting the boiler heat source to the inside of the extraction bucket 100.

[0038] In order to make the heat exchange channel 200 can be single-line communication, therefore, further disclose the specific structure of the heat exchange channel 200, such as Figure 4As shown, therefore, the heat exchange channel 200 at least includes an upper gas collection frame 210 communicated with the top of the heat exchange pipe 300, a lower gas collection frame 220 communicated with the bottom of the heat exchange pipe 300, the inner wall of the lower gas collection frame 220 is fixedly communicated with an air inlet pipe 221, the inner wall of the lower gas collection frame 220 is fixedly communicated with an air outlet pipe 222, the inner wall of the lower gas collection frame 220 and the upper gas collection frame 210 are each provided with four partitions 223, and the partitions 223 are used to divide the area of the lower gas collection frame 220 and the upper gas collection frame 210 and communicate with the heat exchange pipe 300. By connecting the air inlet pipe 221 to the boiler chimney, the air inlet pipe 221 will transmit the connected gas to the inside of the lower gas collection frame 220, and the lower gas collection frame 220 will transmit the gas to the inner cavity of the heat exchange pipe 300, to the inside of the upper gas collection frame 210, and to another area of the heat exchange pipe 300 connected from the upper gas collection frame 210. Thus, the gas will flow from the air outlet pipe 222 through the lower gas collection frame 220, the upper gas collection frame 210, the heat exchange pipe 300, and the inside single line. During the flow of the gas in the heat exchange pipe 300, the heat carried by the gas is transferred to the heat exchange pipe 300, thereby heating the animal fat inside the extraction bucket 100.

[0039] In order to prevent gas leakage when the lower gas collection frame 220 and the upper gas collection frame 210 are communicated with the heat exchange pipe 300, a plurality of air slots are formed in the top of the lower gas collection frame 220 and the bottom of the upper gas collection frame 210, which are adapted to be communicated with the bottom of the heat exchange pipe 300 and the top of the heat exchange pipe 300, respectively. By fixedly connecting the upper and lower ends of the heat exchange pipe 300 with the air slots formed in the upper gas collection frame 210 and the lower gas collection frame 220, gas leakage can be prevented.

[0040] In order to enable the upper gas collection frame 210 and the lower gas collection frame 220 to flow through the heat exchange pipe 300, a plurality of air slots 224 are formed in the inner wall of the upper gas collection frame 210, and two air slots 224 are formed in the inner wall of the lower gas collection frame 220, the inner wall of the two air slots 224 is fixedly communicated with a transmission pipe 225. The gas entering through the air inlet pipe 221 will first enter N1, then enter N2 along the top-communicated heat exchange pipe 300, then enter N3 through the heat exchange pipe 300, then enter N4 along the heat exchange pipe 300, then enter N5 along the transmission pipe 225, then enter N6 through the heat exchange pipe 300 communicated with the top of N5, then enter N7 along the transmission pipe 225 communicated with the upper gas collection frame 210, and then enter N8 through the heat exchange pipe 300 communicated with the bottom of N7 and then discharged from the air outlet pipe 222, thereby realizing the flow of the gas. Figures 5-6 As shown.

[0041] Considering that the animal fat will adhere to the surface of the heat exchange pipe 300 when the animal fat is inside the extraction barrel 100 and contacts the heat exchange pipe 300, the surface of the heat exchange pipe 300 is provided with a nano coating and a PTFE plus PTFA non-stick coating, the adhesion between the animal fat and the heat exchange pipe 300 is reduced, so that the fat adhering to the surface of the heat exchange pipe 300 is effectively prevented, the heat exchange pipe 300 can be kept clean by spraying a nano layer on the surface of the heat exchange pipe 300, and the heat exchange efficiency of the heat exchange pipe 300 is ensured not to be affected by the fat adhesion.

[0042] In order to make the stirring assembly 400 can be heated evenly inside when the heat exchange channel 200 heats the animal fat, the stirring assembly 400 comprises a bottom bearing 414 fixed on the top of the lower air collection frame 220, the inner wall of the bottom bearing 414 is rotatably connected with a rotating shaft 411, the surface of the rotating shaft 411 is vertically and equidistantly distributed with three stirring blades 412, and the three stirring blades 412 are annularly and equidistantly distributed, the rotation of the rotating shaft 411 can drive the three stirring blades 412 on the surface to rotate, and the distribution of the stirring blades 412 can ensure that the animal fat is stirred more uniformly and sufficiently.

[0043] Considering that the rotation of the rotating shaft 411 needs to be powered, the top of the rotating shaft 411 is fixedly connected with a speed reducer motor 410, and the bottom of the speed reducer motor 410 is fixedly connected to the top of the extraction barrel 100. The working of the speed reducer motor 410 can make the motor shaft rotate to drive the rotating shaft 411 to rotate.

[0044] Considering that the support force is not enough when the heat exchange pipe 300 is connected to the air slots formed in the lower air collection frame 220 and the upper air collection frame 210, the inner wall of the extraction barrel 100 is provided with four support devices 310, the bottom of two support devices 310 is in contact with the top of the lower air collection frame 220, and the top of the other two support devices 310 is in contact with the bottom of the upper air collection frame 210, and a plurality of round holes are formed on the surface of the support device 310, and the inner wall of the round hole is adapted to connect the surface of the heat exchange pipe 300. The four support devices 310 are in contact with the lower air collection frame 220 and the upper air collection frame 210 respectively, which provides additional support for the heat exchange pipe 300, effectively solves the problem of insufficient support when the heat exchange pipe 300 is connected to the air slots formed in the upper and lower air collection frames, and secondly, the round holes on the surface of the support device 310 are adapted to connect the heat exchange pipe 300, which can further fix the position of the heat exchange pipe 300.

[0045] In view of the long length of the heat exchange pipe 300, in the process of transmitting the gas, once the gas pressure is too large, the heat exchange pipe 300 will shake, therefore, the inner wall of the extraction barrel 100 is fixedly connected with a fixer 320, the inner wall of the fixer 320 contacts the surface of the heat exchange pipe 300, which fixes the middle part of the heat exchange pipe 300, and the heat exchange pipe 300 is fixed in the fixer 320, so that the heat exchange pipe 300 is prevented from shaking due to the too large gas pressure in the process of transmitting the gas, the setting of the fixer 320 can effectively enhance the stability of the heat exchange pipe 300, prevent the heat exchange pipe 300 from shaking greatly in the process of equipment operation, and ensure that the heat exchange pipe 300 is firmly and reliably connected with the upper and lower gas collecting frames.

[0046] In view of the limited service life of the nano layer on the surface of the heat exchange pipe 300, the end, away from the rotating shaft 411, of the stirring blade 412 is fixedly connected with a scraper 413, and the surface of the scraper 413 contacts the surface of the heat exchange pipe 300, the stirring blade 412 is rotated through the working of the stirring assembly 400, the rotation of the stirring blade 412 drives the scraper 413 to contact the surface of the stirring blade 412, and the animal fat possibly adhered to the surface of the heat exchange pipe 300 can be effectively scraped off.

[0047] The working principle of the utility model is as follows: the animal fat needing to extract oil is placed in the feed pipe 101, at this time, the animal fat will reach the inner cavity of the extraction barrel 100, the top of the lower gas collecting frame 220, at this time, the gas inlet pipe 221 is connected to the waste gas of the boiler chimney, the gas entering through the gas inlet pipe 221 will first reach N1, at this time, the gas will enter N2 along the heat exchange pipe 300 connected to the top, the gas entering N2 will enter N3 through the heat exchange pipe 300, the gas reaching N3 will enter N4 along the heat exchange pipe 300, the gas reaching N4 will reach N5 along the transmission pipeline 225, and will enter N6 through the heat exchange pipe 300 connected to the top of N5, the gas reaching N6 will reach N7 along the transmission pipeline 225 connected to the upper gas collecting frame 210, and will reach N8 through the heat exchange pipe 300 connected to the bottom of N7 to discharge the gas outlet pipe 222, realizing the circulation of the gas, in the process of flowing in the heat exchange pipe 300, the gas transfers the heat carried by itself to the heat exchange pipe 300, thereby heating the animal fat in the extraction barrel 100, the motor shaft is rotated in the inner wall of the bearing of the upper gas collecting frame 210 through the working of the speed reducer motor 410, and drives the rotating shaft 411 to rotate, the rotation of the rotating shaft 411 drives the three stirring blades 412 on the surface to rotate, the distribution of the stirring blades 412 can ensure that the animal fat is stirred more uniformly and sufficiently, the rotation of the stirring blades 412 drives the scraper 413 to contact the surface of the stirring blades 412, and the animal fat possibly adhered to the surface of the heat exchange pipe 300 can be effectively scraped off, at this time, the extracted oil will be discharged from the discharge port 102.

[0048] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An animal fat extraction and preheating device, comprising an extraction barrel (100), wherein the upper surface of the extraction barrel (100) is fixedly connected to a feed pipe (101), and the lower surface of the extraction barrel (100) is fixedly connected to a discharge port (102), characterized in that: A stirring assembly (400) for stirring and mixing animal fat is provided inside the extraction barrel (100), heat exchange channels (200) are formed near the top and bottom of the extraction barrel (100), a heat exchange tube (300) is provided between the two heat exchange channels (200), and the heat exchange tube (300) is located near the edge of the inner cavity of the extraction barrel (100); A channel is formed between the heat exchange channel (200) and the heat exchange tube (300) to connect the bottom, interior and top of the extraction barrel (100) in a single line. The channel is used to receive heat discharged from the boiler chimney and evenly preheat the animal fat.

2. The animal fat extraction and preheating equipment according to claim 1, characterized in that: The heat exchange channel (200) comprises at least an upper gas collecting frame (210) connected to the top of the heat exchange tube (300), and a lower gas collecting frame (220) connected to the bottom of the heat exchange tube (300). An air inlet pipe (221) is fixedly connected to the inner wall of the lower gas collecting frame (220), and an air outlet pipe (222) is fixedly connected to the inner wall of the lower gas collecting frame (220). Four partitions (223) are provided on the inner walls of the lower gas collecting frame (220) and the upper gas collecting frame (210), and the function of the partitions (223) is to connect the area divided by the lower gas collecting frame (220) and the upper gas collecting frame (210) with the heat exchange tube (300).

3. The animal fat extraction and preheating equipment according to claim 2, characterized in that: The top of the lower gas collecting frame (220) is provided with a plurality of empty slots adapted to communicate with the bottom of the heat exchange tube (300), and the bottom of the upper gas collecting frame (210) is provided with a plurality of empty slots adapted to communicate with the top of the heat exchange tube (300).

4. The animal fat extraction and preheating equipment according to claim 3, characterized in that: The inner wall of the upper gas collecting frame (210) is provided with a plurality of ventilation grooves (224), the inner wall of the lower gas collecting frame (220) is provided with two ventilation grooves (224), and the inner walls of the two ventilation grooves (224) are fixedly connected to a transmission pipe (225).

5. The animal fat extraction and preheating equipment according to claim 3, characterized in that: The surface of the heat exchange tube (300) is provided with a nano coating or a PTFE+PTFA coating, which reduces the adhesion between the animal fat and the heat exchange tube (300), thereby effectively preventing the fat from adhering to the surface of the heat exchange tube (300).

6. The animal fat extraction and preheating equipment according to claim 2, characterized in that: The stirring assembly (400) includes a bottom bearing (414) fixed on the top of the lower gas collecting frame (220), the inner wall of the bottom bearing (414) is rotatably connected to a rotating shaft (411), and three stirring blades (412) are vertically and equidistantly distributed on the surface of the rotating shaft (411), and the three stirring blades (412) are distributed in a circular shape and equidistantly.

7. The animal fat extraction and preheating equipment according to claim 6, characterized in that: The top of the rotating shaft (411) is fixedly connected to a reduction motor (410), and the bottom of the reduction motor (410) is fixedly connected to the top of the extraction barrel (100).

8. The animal fat extraction and preheating equipment according to claim 2, characterized in that: Four supports (310) are provided on the inner wall of the extraction barrel (100), the bottoms of two of the supports (310) are in contact with the top of the lower gas collecting frame (220), and the tops of the other two supports (310) are in contact with the bottom of the upper gas collecting frame (210), and a plurality of circular holes are provided on the surface of the supports (310), the inner walls of the circular holes being adapted to connect to the surface of the heat exchange tube (300).

9. The animal fat extraction and preheating equipment according to claim 2, characterized in that: The inner wall of the extraction barrel (100) is fixedly connected to a fixer (320), and the inner wall of the fixer (320) contacts the surface of the heat exchange tube (300), and its function is to fix the middle part of the heat exchange tube (300).

10. The animal fat extraction and preheating equipment according to claim 6, characterized in that: One end of the stirring blade (412) away from the rotating shaft (411) is fixedly connected to a scraper (413), and the surface of the scraper (413) is in contact with the surface of the heat exchange tube (300).

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