Efficient heat exchanger

Abstract

The utility model discloses an efficient heat exchanger which comprises a water chamber, a piping system assembly, a shell and a fixing support. The water chamber comprises a water chamber shell, a water inlet, a feed water outlet, a pass partition plate, a flat cover, a four-element ring and a limiting ring, wherein the pass partition plate comprises a door plate, a throttle plate fixing seat welded at the tail end of the door plate, a throttle orifice plate embedded and fixed on the throttle plate fixing seat, and a flitch strip welded on the throttle plate fixing seat; according to the requirement of the heat exchanger, the throttling orifice plate with the throttling orifices of the corresponding density is assembled, the flowing speed and distribution of fluid in the heat exchanger can be adjusted, so that the fluid in a heat exchanger tube bundle is evenly distributed, disturbance and mixing caused in the fluid passing process due to the fact that the fluid is excessively concentrated or excessively deflected to one side are avoided, and the heat exchange efficiency is improved. In addition, the throttling orifice plate can reduce the resistance of the fluid passing through the throttling orifice plate, reduce the pressure loss of the system and improve the operation efficiency of the heat exchanger.

Description

Technical Field

[0001] The utility model relates to a high-efficiency heat exchanger. Background Art

[0002] The heat exchanger is one of the more important equipment in the heat recovery system of the steam turbine unit in a power plant. With the continuous advancement of technology and the increasing requirements for the economy of generator sets, the cooling of the high-pressure heater of large units has developed from being built into the body to a separate heat exchange device separated from the body, namely the so-called superheated drain heat exchanger. That is, after the heated steam is heated by the steam cooler to heat the feed water, the steam parameters become lower and then enter the next level of high-pressure heater to further exchange heat.

[0003] However, the partition plate inside the water chamber of the existing heat exchanger can only play a role of partitioning. Due to the lack of a throttling plate, it is difficult to effectively control the flow rate of the fluid, resulting in a flow rate that is too fast or too slow. At the same time, the fluid will pass through the heat exchanger at an uneven speed, resulting in uneven temperature distribution. The temperature in some areas is too high, while the temperature in other areas is too low, affecting the performance of the heat exchanger. Therefore, the existing heat exchangers are all equipped with a throttling plate, but the existing throttling plate is a plate body with a single large-diameter throttling hole, and cannot be disassembled and replaced according to needs. In addition, although the single large-diameter throttling hole can provide a larger flow area, it is also easy to produce a large pressure difference due to the large flow area and the fast fluid speed, resulting in more obvious uneven flow rate and noise, and due to the fast fluid speed, the fluid cannot be evenly distributed in the conduit system components, so there is still a disadvantage of low heat exchange effect. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a heat exchanger which can effectively improve heat exchange efficiency, reduce energy loss, and has a stable and reliable structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A high-efficiency heat exchanger includes a water chamber, a pipe system component welded to the side of the water chamber and sealed with the water chamber, a shell sleeved on the pipe system component and sealed and fixed with the pipe system component, and a fixing bracket arranged at the bottom of the pipe system component and the shell for fixing the heat exchanger; the water chamber includes a water chamber shell, a water supply inlet arranged at the bottom of the water chamber shell for coolant to enter, and a water supply outlet symmetrically arranged with the water supply inlet, and a partition plate arranged inside the water chamber, and a flat cover arranged in the water chamber shell and away from the side of the pipe system component, and a four-ring arranged behind the flat cover for limiting the position of the flat cover, and a limiting ring arranged behind the four-ring for fixing the flat cover, the partition plate includes a door plate welded and fixed to the water chamber shell and hollowed out in the middle, a throttle plate fixing seat welded to the tail end of the door plate, a throttle orifice plate embedded in the throttle plate fixing seat and tightened and fixed by a nut, and a plate strip welded on the throttle plate fixing seat that can abut against the pipe system component.

[0007] Preferably, a gasket is arranged on the surface of the door panel around the hollow edge, and a cover plate is fixed to the hollow of the door panel by means of studs and nuts and is sealed by squeezing the gasket.

[0008] Preferably, the throttle plate fixing seat includes a throttle plate fixing seat body and vertical plates welded to both ends of the throttle plate fixing seat body; a rectangular through hole is opened in the central part of the throttle plate fixing seat body, and a throttle orifice plate mounting groove with a stud is also opened on the side of the rectangular through hole.

[0009] Preferably, a sealing ring and a gasket are also provided on the outward side of the flat cover, and a lifting eye screw is also installed on the outward side at the center of the flat cover; a number of fixing studs are evenly installed on the periphery of the lifting eye screw; through holes corresponding to the fixing studs are provided on the limiting ring; the flat cover and the limiting ring are connected and fixed by fixing studs installed on the flat cover.

[0010] Preferably, the pipe system assembly includes a tube sheet, and a U-shaped tube welded to the tube sheet at both ends, and a plurality of distance tubes extending to one side of the tube sheet, and a plurality of pull rods arranged on the tube sheet, and a cooling assembly arranged below one side of the tube sheet, and a plurality of first baffles arranged on the cooling assembly, and a second baffle arranged behind the cooling assembly, and a sliding assembly arranged at the bottom of the U-shaped tube away from one end of the tube sheet, and a steam baffle rod arranged on the second baffle rod, and a steam port baffle arranged on the steam baffle rod, and an air extraction pipe arranged in the middle of the U-shaped tube.

[0011] Furthermore, the cooling assembly includes a cooling cover shell welded on the tube sheet, a cooling shell top plate arranged on the top of the cooling cover shell, a cooling shell end plate arranged on one side of the cooling cover shell and away from the tube sheet, a third baffle plate equidistantly staggeredly arranged in the cooling cover shell, and a cooling section inlet arranged at the bottom of the cooling cover shell and close to the cooling shell end plate.

[0012] Furthermore, a cooling section vent connected to the cooling assembly is provided on the side of the tube sheet.

[0013] Furthermore, the sliding assembly includes a channel steel and a plurality of pulleys arranged on the channel steel.

[0014] Preferably, the outer shell includes a shell cover, a track angle steel arranged at the bottom position of the inner side of the shell cover, a wheel fixing frame arranged at the bottom of the outer side of the shell cover, and rollers symmetrically installed on the wheel fixing frame, and a drain port arranged at the bottom of the shell cover, and an emergency drain port arranged at the bottom of the shell cover, and a shell side drain port arranged next to the emergency drain port, and a chemical cleaning port arranged at the top of the shell cover, and a steam inlet arranged next to the chemical cleaning port, and a safety valve interface arranged next to the steam inlet, and a nitrogen filling port arranged next to the safety valve interface, and a signal port arranged above the drain port and located on the side of the shell cover, and an air extraction port arranged on the same side of the signal port.

[0015] The beneficial effects of the utility model are as follows: the utility model is equipped with a throttling orifice plate with corresponding density throttling holes according to the requirements of the heat exchanger, and can adjust the flow velocity and distribution of the fluid in the heat exchanger to achieve uniform distribution of the fluid in the heat exchanger tube bundle, avoid excessive concentration of the fluid or excessive bias to one side, and avoid disturbance and mixing caused by the passage of the fluid, so as to promote the mixing of fluids on different flow paths and reduce the temperature difference of the fluid. In addition, the throttling orifice plate can also reduce the resistance of the fluid passage, reduce the pressure loss of the system, and improve the operating efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a high-efficiency heat exchanger in this embodiment;

[0017] Figure 2 It is a left view of the structural schematic diagram of a high-efficiency heat exchanger of this embodiment;

[0018] Figure 3 for Figure 1 Schematic diagram of the structure of the middle-pass partition;

[0019] Figure 4 for Figure 3 Schematic diagram of the structure of the middle door panel;

[0020] Figure 5 for Figure 3 A schematic diagram of the structure of the middle throttle orifice plate being assembled on the throttle plate fixing seat;

[0021] Figure 6 for Figure 5 A schematic diagram of the structure of the middle throttle plate fixing seat;

[0022] Figure 7This is a schematic diagram of the structure of a pipe system assembly of a high-efficiency heat exchanger in this embodiment;

[0023] Figure 8 for Figure 7 A cross-sectional view of the structure of the CC combined with the shell;

[0024] Fig. 9 for Figure 7 Cross-section of the middle AA;

[0025] Fig.10 This is a schematic diagram of the shell structure of a high-efficiency heat exchanger in this embodiment. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0027] Example

[0028] like Figure 1-10 As shown, a high-efficiency heat exchanger includes a water chamber 1, a pipe assembly 2 welded to the side of the water chamber 1 to form a seal with the water chamber 1, a shell 3 sleeved on the pipe assembly 2 to form a seal and fixed with the pipe assembly 2, and a fixing bracket 4 arranged at the bottom of the pipe assembly 2 and the shell 3 for fixing the heat exchanger.

[0029] The water chamber 1 includes a water chamber shell 11, a water inlet 12 arranged at the bottom of the water chamber shell 11 for the coolant to enter, a water outlet 13 symmetrically arranged with the water inlet 12, a partition plate 14 arranged inside the water chamber 1, a flat cover 15 arranged in the water chamber shell 11 and away from the side of the pipe system component 2, a four-way ring 16 arranged behind the flat cover 15 for limiting the position of the flat cover 15, and a limiting ring 17 arranged behind the four-way ring 16 for fixing the flat cover 15. The pipe system assembly 2 includes a tube sheet 21, a U-shaped tube 22 welded to the tube sheet 21 at both ends, a plurality of distance tubes 23 extending to one side of the tube sheet 21, a plurality of tie rods 24 arranged on the tube sheet 21, a cooling assembly 25 arranged below one side of the tube sheet 21, a plurality of first baffles 26 arranged on the cooling assembly 25, a second baffle 27 arranged behind the cooling assembly 25, a sliding assembly 28 arranged at the bottom of the U-shaped tube 22 and away from one end of the tube sheet 21, a steam baffle 29 arranged on the second baffle 27, a steam port baffle 210 arranged on the steam baffle 29, and an air extraction pipe 211 arranged in the middle of the U-shaped tube 22.

[0030] The partition plate 14 includes a door plate 141 welded to the water chamber shell 11 and hollowed out in the middle, a throttle plate fixing seat 142 welded to the rear end of the door plate 141, a throttle orifice plate 143 embedded in the throttle plate fixing seat 142 and fixed by a nut, and a plate strip 144 welded to the throttle plate fixing seat 142 and capable of abutting against the pipe system assembly 2.

[0031] The surface of the door panel 141 is provided with a gasket 1411 around the hollow edge, and a cover plate 1412 is fixed to the hollow of the door panel 141 by means of studs and nuts and is sealed by squeezing the gasket 1411 .

[0032] The throttle plate fixing seat 142 includes a throttle plate fixing seat body 1421 and vertical plates 1422 welded to both ends of the throttle plate fixing seat body 1421. Specifically, the vertical plate at one end of the throttle plate fixing seat body 1421 is welded and fixed to the rear end of the door plate 141, and the vertical plate at the other end of the throttle plate fixing seat body 1421 is abutted and welded to the tube plate 21.

[0033] A rectangular through hole 14211 is provided at the center of the throttle plate fixing seat body 1421, and a throttle orifice plate mounting groove 14212 with a stud is provided on the side of the rectangular through hole 14211. Specifically, the throttle orifice plate 143 is mounted in the throttle orifice plate mounting groove 14212 and is tightened and fixed by a nut. According to needs, the throttle orifice plate with the required density throttling hole is fixed between the water chamber 1 and the tube sheet 21.

[0034] In this embodiment, the water chamber 1 structure is adopted, and the throttling orifice plate 143 can adjust the flow velocity and distribution of the fluid in the heat exchanger by designing the aperture and arranging the position, so as to achieve uniform distribution of the fluid in the heat exchanger tube bundle, avoid excessive concentration of the fluid or excessive bias to one side, and thus improve the heat exchange efficiency. Furthermore, the throttling orifice plate can cause a certain degree of disturbance and mixing during the passage of the fluid, promote the mixing of fluids on different flow paths, reduce the temperature difference of the fluid, and help improve the heat exchange efficiency. In addition, a properly designed throttling orifice plate can reduce the resistance of the fluid passage, reduce the pressure loss of the system, and improve the operating efficiency of the heat exchanger. In general, the throttling orifice plate plays an important role in adjusting the flow distribution of the fluid, increasing mixing and reducing the pressure loss in the partition plate, and is a key control element for the internal fluid distribution and heat exchange efficiency of the heat exchanger.

[0035] It should be further explained that the water supply inlet 12 and the water supply outlet 13 are provided, so that the coolant can be stably supplied to the pipe system component 2 to ensure the normal operation of the system; the use of the partition plate 14 can divide the internal area of ​​the water chamber 1 into different flow channels, so that the coolant can be reasonably distributed and flow inside the water chamber 1, thereby increasing the heat transfer area and heat transfer efficiency of the heat exchanger; the setting of the flat cover 15 can effectively prevent the coolant from splashing out or external impurities from entering the water chamber 1, thereby ensuring the stability and safety of the system; the setting of the four-ring 16 and the limiting ring 17 can fix the position of the flat cover 15, so that it forms a good seal with the water chamber 1, and prevents the coolant from leaking or external dust and impurities from entering the heat exchanger.

[0036] The flat cover 15 is also provided with a sealing ring 151 and a gasket 152 on the outward side, and a lifting eye screw 153 is installed on the outward side at the center of the flat cover 15; a plurality of fixing studs 154 are evenly installed on the periphery of the lifting eye screw 153; through holes corresponding to the fixing studs 154 are provided on the limiting ring 17; the flat cover 15 and the limiting ring 17 are connected and fixed by the fixing studs 154 installed on the flat cover 15.

[0037] In this embodiment, the arrangement of the sealing ring 151 and the gasket ring 152 can effectively prevent leakage of the medium and ensure the sealing and safety of the system; the installation of the lifting screw 153 makes the equipment more convenient during transportation and installation, improves the operating efficiency and reduces the installation risk; the through hole on the limiting ring 17 corresponds to the fixing stud 154, realizes the precise fixation between the flat cover 15 and the limiting ring 17, and avoids equipment failure caused by looseness; through the connection fixation of the fixing stud 154, the installation structure can be simplified, the number of parts used can be reduced, thereby reducing the cost and maintenance difficulty.

[0038] In this embodiment, the pipe system component 2 adopts a combination of a U-shaped tube 22 and a fixed-distance tube 23, which can realize heat exchange between water and steam, thereby making the heat exchange effect of the heat exchanger more excellent; the setting of the cooling component 25 and the baffle can effectively adjust the speed and direction of the water flow, form turbulence in the water flow process, and thus improve the heat transfer efficiency; the function of the steam baffle 29 is to control the flow direction and distribution of steam, so that it can be reasonably distributed inside the heat exchanger according to the design requirements, ensuring the heat transfer efficiency of the fluid and the operating stability of the system; the steam port baffle 210 is arranged above the steam baffle 29, which can prevent the steam from overflowing from above the steam baffle 29 and guide the steam to the designed outlet position, and by adjusting the position of the steam port baffle 210, the flow range of the steam can be effectively controlled to avoid steam leakage or disordered flow, ensure that the fluid inside the heat exchanger transfers heat on the correct path, and improve the heat transfer efficiency and operating effect of the system; the setting of the air extraction pipe 211 can extract the air in the heat exchanger, avoid the influence of air on heat exchange, and further improve the thermal efficiency.

[0039] The cooling assembly 25 includes a cooling cover shell 251 welded to the tube sheet 21, a cooling shell top plate 252 arranged on the top of the cooling cover shell 251, a cooling shell end plate 253 arranged on one side of the cooling cover shell 251 and away from the tube sheet 21, a third baffle 254 equidistantly staggeredly arranged in the cooling cover shell 251, and a cooling section inlet 255 arranged at the bottom of the cooling cover shell 251 and close to the cooling shell end plate 253.

[0040] A cooling section vent 212 connected to the cooling assembly 25 is provided on the side of the tube sheet 21 .

[0041] It should be noted that the vent 212 of the cooling section connected to the cooling component 25 can ensure the stability of the pressure inside the system, and avoid problems such as air blockage and hydraulic shock caused by gas accumulation during system startup and operation; the setting of the cooling cover 251 and the cooling shell top plate 252 can guide the cooling medium to the cooling section inlet 255, ensuring the cooling effect; a cooling shell end plate 253 is set on one side of the cooling cover 251, which can ensure that the cooling medium does not leak out, avoiding energy loss and equipment failure caused by leakage; the equidistant staggered setting of the third baffle 254 can make the cooling medium generate more eddy currents and turbulence, enhance the heat transfer effect, and improve the energy efficiency of the entire system; the setting of the cooling section inlet 255 can evenly introduce the cooling medium into the cooling section, avoiding equipment failure caused by uneven cooling.

[0042] The sliding assembly 28 includes a channel steel 281 and a plurality of pulleys 282 disposed on the channel steel 281 .

[0043] It should be noted that the channel steel 281 can withstand a certain load and bending force, can fix the position of the sliding assembly 28, and can connect the sliding assembly 28 with other equipment, thereby increasing the stability and reliability of the system; the setting of the pulley 282 can reduce the friction between the sliding assembly 28 and other equipment, thereby reducing the difficulty of operation, and also reducing the possibility of equipment wear and failure; the number and position of the pulley 282 can be adjusted according to specific needs, thereby making the operation of the sliding assembly 28 more stable, efficient and safe.

[0044] The shell 3 includes a shell cover 30, a track angle steel 31 arranged at the bottom position of the inner side of the shell cover 30, a wheel fixing frame 32 arranged at the bottom of the outer side of the shell cover 30, and a roller 33 symmetrically mounted on the wheel fixing frame 32, a drain port 34 arranged at the bottom of the shell cover 30, an emergency drain port 35 arranged at the bottom of the shell cover 30, and a shell side drain port 36 arranged next to the emergency drain port 35, and a chemical cleaning port 37 arranged at the top of the shell cover 30, and a steam inlet 310 arranged next to the chemical cleaning port 37, and a safety valve interface 311 arranged next to the steam inlet 310, and a nitrogen filling port 312 arranged next to the safety valve interface 311, and a signal port 313 arranged above the drain port 34 and located on the side of the shell cover 30, and an air extraction port 314 arranged on the same side of the signal port 313.

[0045] In this embodiment, the arrangement of the track angle steel 31 enables the sliding assembly 28 on the pipe assembly 2 to slide smoothly inside the housing 3 when the heat exchanger is assembled, which facilitates the assembly of the heat exchanger; the rollers 33 are fixed to the wheel fixing frame 32 by bolts, and the symmetrical installation of the rollers 33 can ensure the balance and stability of the entire heat exchanger, which is more convenient when moving or adjusting; the arrangement of the drain port 34 can timely remove the accumulated water or impurities inside the heat exchanger to prevent blockage and affect the heat transfer effect; the arrangement of the emergency drain port 35 can quickly drain in an emergency. The liquid inside the heat exchanger is discharged to ensure the safety of the system; the shell side drain port 36 is set to facilitate the discharge of the coolant inside the heat exchanger for maintenance and care; the chemical cleaning port 37 is set to facilitate the cleaning of the heat exchanger; the steam inlet 310, the safety valve interface 311 and the nitrogen filling port 312 are set to facilitate the steam heating, pressure control and gas filling operations of the heat exchanger; the signal port 313 and the air extraction port 314 are set to facilitate the monitoring and adjustment of the gas flow inside the heat exchanger to ensure the normal operation of the system.

[0046] It should be noted that in this embodiment, pressure gauge interfaces and thermometer interfaces are provided at the water supply inlet 12, water supply outlet 13 and steam inlet 310. At the same time, a pressure gauge interface is also provided on the shell 3 between the chemical cleaning port 37 and the steam inlet 310, and a thermometer interface is also provided next to the nitrogen filling port 312; the pressure gauge interface can be installed with a pressure gauge to monitor the pressure conditions at the water supply inlet 12, water supply outlet 13, steam inlet 310 and inside the equipment in real time, ensure that the system operates within a safe range, and prevent equipment failures caused by excessively high or low pressure; the setting of the thermometer interface can monitor the temperature conditions at the water supply inlet 12, water supply outlet 13, steam inlet 310 and inside the equipment in real time, help operators understand the system operation status, adjust process parameters in time, and ensure stability and safety in the production process; the setting of these interfaces makes system monitoring and adjustment more convenient, and helps operators to discover and solve problems in time.

[0047] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. A high-efficiency heat exchanger, comprising a water chamber, and a pipe system assembly welded to the side of the water chamber to form a seal with the water chamber, and a shell sleeved on the pipe system assembly to form a seal and fix with the pipe system assembly, and a fixing bracket arranged at the bottom of the pipe system assembly and the shell for fixing the heat exchanger; the water chamber comprises a water chamber shell, and a water supply inlet arranged at the bottom of the water chamber shell for coolant to enter, and a water supply outlet symmetrically arranged with the water supply inlet, and a partition plate arranged inside the water chamber, and a flat cover arranged in the water chamber shell away from the side of the pipe system assembly, and a four-ring arranged behind the flat cover for limiting the position of the flat cover, and a limiting ring arranged behind the four-ring for fixing the flat cover, characterized in that: The partition plate includes a door plate welded and fixed to the water chamber shell and with a hollowed-out central portion, a throttle plate fixing seat welded to the rear end of the door plate, a throttle orifice plate embedded in the throttle plate fixing seat and fixed by a nut, and a plate strip welded to the throttle plate fixing seat and capable of abutting against a pipe system assembly.

2. The high-efficiency heat exchanger according to claim 1, characterized in that: The surface of the door panel is provided with a gasket around the hollow edge, and a cover plate is fixed at the hollow of the door panel through the cooperation of studs and nuts and is sealed by squeezing the gasket.

3. The high-efficiency heat exchanger according to claim 1, characterized in that: The throttle plate fixing seat includes a throttle plate fixing seat body and vertical plates welded to both ends of the throttle plate fixing seat body; a rectangular through hole is opened in the center of the throttle plate fixing seat body, and a throttle orifice plate mounting groove with a stud is also opened on the side of the rectangular through hole.

4. The high-efficiency heat exchanger according to claim 1, characterized in that: The flat cover is also provided with a sealing ring and a gasket on the outward side, and a lifting eye screw is also installed on the outward side at the center of the flat cover; a plurality of fixing studs are evenly installed on the outer periphery of the lifting eye screw; the limiting ring is provided with through holes corresponding to the fixing studs; the flat cover and the limiting ring are connected and fixed by the fixing studs installed on the flat cover.

5. The high-efficiency heat exchanger according to claim 1, characterized in that: The pipe system assembly includes a tube sheet, a U-shaped tube welded to the tube sheet at both ends, a plurality of distance tubes extending to one side of the tube sheet, a plurality of tie rods arranged on the tube sheet, a cooling assembly arranged below one side of the tube sheet, a plurality of first baffles arranged on the cooling assembly, a second baffle arranged behind the cooling assembly, a sliding assembly arranged at the bottom of the U-shaped tube and away from one end of the tube sheet, a steam baffle rod arranged on the second baffle rod, a steam port baffle arranged on the steam baffle rod, and an air extraction pipe arranged in the middle of the U-shaped tube.

6. The high-efficiency heat exchanger according to claim 5, characterized in that: The cooling assembly includes a cooling cover shell welded on the tube sheet, a cooling shell top plate arranged on the top of the cooling cover shell, a cooling shell end plate arranged on one side of the cooling cover shell and away from the tube sheet, a third baffle plate equidistantly staggeredly arranged in the cooling cover shell, and a cooling section inlet arranged at the bottom of the cooling cover shell and close to the cooling shell end plate.

7. The high-efficiency heat exchanger according to claim 5, characterized in that: The side of the tube sheet is provided with a cooling section vent which is connected to the cooling assembly.

8. The high-efficiency heat exchanger according to claim 5, characterized in that: The sliding assembly comprises a channel steel and a plurality of pulleys arranged on the channel steel.

9. The high-efficiency heat exchanger according to claim 1, characterized in that: The shell includes a shell cover, a track angle steel arranged at the bottom position of the inner side of the shell cover, a wheel fixing frame arranged at the bottom of the outer side of the shell cover, and rollers symmetrically installed on the wheel fixing frame, a drain port arranged at the bottom of the shell cover, an emergency drain port arranged at the bottom of the shell cover, a shell side drain port arranged next to the emergency drain port, a chemical cleaning port arranged at the top of the shell cover, a steam inlet arranged next to the chemical cleaning port, a safety valve interface arranged next to the steam inlet, a nitrogen filling port arranged next to the safety valve interface, a signal port arranged above the drain port and located on the side of the shell cover, and an air extraction port arranged on the same side of the signal port.

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