A hot water heating and pressurization device

Abstract

This utility model provides a hot water heating and pressurization device, comprising: a conveying unit for conveying initial hot water, a regulating unit for introducing superheated steam, a heating unit for mixing the medium and achieving heating and pressurization, and connected to the conveying unit and the regulating unit respectively, and a sensing unit for real-time monitoring and signal feedback. The regulating unit and the sensing unit are connected by a control unit signal to regulate the steam flow rate. Through the organic integration of each unit and the linkage regulation of the control unit, the superheated steam is directly mixed with the process hot water to increase the temperature and pressurization, reducing the heat energy waste of the superheated steam, improving the thermal efficiency of the superheated steam, and enabling the heated and pressurized hot water to meet the heat requirements of the ethanol distillation process.

Description

Technical Field

[0001] This utility model relates to the field of fluid heating technology, specifically to a hot water heating and pressurization device. Background Technology

[0002] In the chemical production field, especially in the ethanol distillation process, hot water with a temperature of 90℃-100℃ and a pressure of 0.5MPa-0.6MPa is required as the heating medium. However, the existing process has the following problems: 1. In actual production, the steam introduced into the plant is superheated steam, whose characteristics determine that it cannot be directly applied to the heating device. The traditional process requires converting it into saturated steam first, which causes heat loss and results in low thermal efficiency of superheated steam; 2. The initial parameters of the hot water in the existing process are a temperature of 70℃-80℃ and a pressure of 0.3MPa-0.4MPa, which cannot meet the heat demand of the ethanol distillation process; 3. The process hot water does not form an effective circulation after use, and some heat energy and water resources are wasted, increasing production costs.

[0003] Chinese patent CN207335470U discloses a steam heating device that releases steam through a serpentine coil inside a hot water tank to heat the water inside. The tank is open to the atmosphere, so it cannot form a closed pressure environment. Furthermore, the temperature of the hot water inside the tank is stabilized through multiple cycles. The heat exchange efficiency is low and the energy utilization rate is insufficient. Utility Model Content

[0004] This utility model provides a hot water heating and pressurization device to solve the problem that the water temperature and pressure in the existing ethanol distillation process do not meet the reaction requirements.

[0005] To address the aforementioned problems, this utility model provides a hot water heating and pressurization device for supplying hot water to an ethanol distillation unit that meets parameter requirements. The device includes: a conveying unit for delivering initial hot water; a regulating unit for introducing superheated steam; a heating unit for mixing the medium and achieving temperature and pressure increases, connected to both the conveying unit and the regulating unit; and a sensing unit for real-time monitoring and signal feedback. The regulating unit and the sensing unit are connected via a control unit signal to regulate the steam flow rate. Through the organic integration of these units and the coordinated regulation of the control unit, the superheated steam is mixed with the initial hot water, ensuring that the temperature and pressure of the heated and pressurized medium remain stable within the set range, thus meeting the process requirements for hot water parameters.

[0006] Since the initial hot water delivery process is prone to instability, resulting in fluctuating hot water volume entering the heating unit, in order to avoid affecting the subsequent heating and pressurization effect, the delivery unit provided in this application further includes at least one fluid delivery device and a flow control component connected through a fluid input pipeline. The fluid delivery device provides stable power, the control component regulates the flow rate, and the flow input pipeline delivers the hot water in a directional manner, so that the hot water flow rate entering the heating unit is stable and controllable, laying the foundation for subsequent mixed heating and pressurization.

[0007] Since a single steam regulating valve is prone to malfunction, which can lead to uncontrolled steam flow and uncontrolled pressurization of the heating unit, in order to avoid affecting the pressurization effect of the heating unit, the regulating unit provided in this application includes at least one flow regulating component. The inlet of the flow regulating component is used to connect with the main steam pipeline. By combining the flow regulating components, the steam input is regulated to further heat and pressurize the hot water in the heating unit, thereby improving the overall stability and reliability of steam regulation.

[0008] In traditional heating devices, insufficient mixing of hot water and steam leads to localized overheating, uneven heating, and pressure inconsistencies. When high-temperature steam mixes with hot water, some of the steam condenses into liquid water. If the steam pipe is external, the condensate will remain in the jacket or pipe, making it difficult for the heat to be recovered by the hot water, resulting in energy waste. Furthermore, the heating unit provided in this application includes a pipe heater connected to the fluid delivery pipeline and a steam pipe passing through the pipe heater and connected to the regulating unit. Extending the steam pipe into the pipe heater ensures full contact with the input hot water, improving the uniformity of hot water heating and enabling the heating of hot water by superheated steam.

[0009] To ensure uniform mixing of superheated steam and hot water, the steam pipe provided in this application is preferably L-shaped, with its vertical section and connecting horizontal section placed within the main cavity. The heat from the superheated steam within the steam pipe can be pre-transferred to the flowing hot water through the pipe wall. Furthermore, the superheated steam released through the opening in the steam pipe directly pressurizes the hot water during mixing due to volume expansion, simultaneously heating the water. The preheated hot water also has better fluidity, and the steam expansion pressure can be evenly distributed throughout the main cavity, ensuring that the temperature and pressure parameters of the hot water meet the required reaction parameters.

[0010] If the steam pipe releases steam only at a single point, such as the heater inlet or outlet, it can easily lead to excessively high local steam concentration and uneven pressure within the heating unit. The steam pipe provided in this application has a closed blind end at the output end, with multiple openings for steam release on its end sidewall. The part of the steam pipe that extends into the main cavity covers the core mixing area of ​​the cavity, while allowing steam to be released from the vertical and horizontal openings of the steam pipe in multiple directions, thereby achieving heating and pressurization of the hot water and improving the stability of the pipeline heater.

[0011] If the pipe heater only has a straight cylindrical structure, the flow velocity inside the pipe is uniform, resulting in a low mixing efficiency of steam and hot water. Furthermore, the pipe heater provided in this application includes a main cavity and contraction cavities symmetrically located at both ends of the main cavity. The contraction cavities at both ends contract away from the main cavity, so that the flow velocity of hot water entering the main cavity from the input pipe is steadily reduced, making it evenly distributed in the main cavity. The reduced flow velocity forms full contact with the released steam, improving the mixing efficiency.

[0012] Since the parameters of the heated and pressurized medium, such as temperature and pressure, cannot be monitored in real time, it is impossible to adjust them in time when the parameters exceed the standard, which affects the subsequent process. At the same time, single parameter monitoring is prone to adjustment failure due to sensor failure. The sensing unit provided in this application includes a temperature sensor and a pressure sensor installed at the outlet end of the pipeline heater. The two together provide feedback signals to the control unit to control the action of the flow regulation component, and monitor the temperature and pressure of the outlet medium in real time, so that the steam volume can be quickly adjusted when any parameter deviates from the set value, thereby improving the reliability of parameter control.

[0013] The technical advantages of this application are as follows: (1) By implementing this device, superheated steam is directly mixed with process hot water to increase temperature and pressure, which reduces the waste of superheated steam's heat energy, improves the thermal efficiency of superheated steam, and enables the hot water after temperature and pressure increase to meet the heat demand of the ethanol distillation process.

[0014] (2) The device is simple and occupies a small area. It can be directly installed at the horizontal pipe of the hot water pump outlet. It is easy to disassemble and install during inspection and maintenance. The device has high stability and safety.

[0015] (3) The implementation of this device ultimately improved the overall thermal utilization rate of the process system and the production efficiency of the process system.

[0016] (4) After the hot water is heated by the ethanol distillation unit, it is transformed back into process hot water at 70-80℃ and 0.3-0.4 MPa. Some of the hot water is discharged to other processes for comprehensive utilization, and the remaining hot water is temporarily stored in the hot water tank and then pumped into the pipeline heating device. This realizes a closed-loop cycle for the comprehensive utilization of process hot water, reducing resource waste and heat energy waste. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a hot water heating and pressurizing device provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of a pipe heater in a hot water heating and pressurizing device provided by this utility model.

[0019] Figure 3This is a schematic diagram of the cross-sectional structure of the steam pipe of a hot water heating and pressurizing device provided by this utility model.

[0020] Explanation of reference numerals in the attached figures: 1000. Ethanol distillation apparatus; 1. Conveying unit; 110. Fluid conveying device; 120. Flow control component; 130. Fluid input pipeline; 2. Regulating unit; 210. Flow regulating component; 211. Pneumatic regulating valve; 212. Bypass valve; 213. Shut-off valve; 220. Steam main pipeline; 3. Heating unit; 310. Pipe heater; 311. Main cavity; 312. Contraction cavity; 320. Steam pipe; 321. Vertical opening; 322. Horizontal opening; 330. Flexible connection; 4. Sensing unit; 410. Temperature sensor; 420. Pressure sensor; 5. Control unit; 6. Bypass channel; 7. Hot water tank. Detailed Implementation

[0021] The following will be combined with the appendix Figures 1-3 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples and should not be used to limit the scope of protection of this application.

[0022] The initial parameters of the existing process hot water are 70℃-80℃ and 0.3MPa-0.4MPa, which cannot meet the heat requirements of the ethanol distillation process. In addition, the steam introduced into the plant is superheated steam, which cannot be directly used for heating devices.

[0023] In order to meet the heat demand of the ethanol distillation unit, referring to Figures 1-3 This invention provides a hot water heating and pressurization device for supplying hot water to an ethanol distillation unit 1000 to meet parameter requirements. It includes a conveying unit 1 for delivering initial process hot water, a regulating unit 2 for introducing superheated steam, a heating unit 3 for mixing the medium and achieving temperature and pressure increases, connected to both the conveying unit 1 and the regulating unit 2, and a sensing unit 4 for real-time monitoring and signal feedback. The regulating unit 2 and the sensing unit 4 are connected via a control unit 5 to regulate the steam flow rate. Through the organic integration of each unit and the coordinated regulation of the control unit 5, the superheated steam is mixed with the initial hot water, ensuring that the temperature and pressure of the heated and pressurized medium remain stable within the set range, thus meeting the process requirements for hot water parameters.

[0024] Continue to refer to Figure 1Because the initial hot water delivery is prone to instability due to unstable flow, resulting in fluctuating amounts of hot water entering heating unit 3, this embodiment provides a delivery unit 1 that includes at least one fluid delivery device 110 and a flow control component 120 connected via a fluid input pipeline 130 to avoid affecting subsequent heating and pressurization effects. The fluid delivery device 110 can be a pump, compressor, or other power device capable of driving fluid flow, while the flow control component 120 can be a valve, throttling element, or other control device capable of adjusting fluid flow. This embodiment provides stable power through a hot water pump, regulates flow through a hot water valve, and delivers hot water in a directional manner through a flow input pipeline, ensuring a stable and controllable flow of hot water entering heating unit 3, thus laying the foundation for subsequent mixing, heating, and pressurization.

[0025] The hot water pump provided in this embodiment is matched according to the maximum hot water demand of the system. A centrifugal pump or a positive displacement pump (gear pump) can be selectively used, and an overload protection device is provided. The hot water valve can be an electric ball valve or a manual shut-off valve, and its diameter matches the hot water inlet pipe. The hot water inlet pipe is made of stainless steel, which has strong corrosion resistance. An insulation layer, such as rock wool or polyurethane, can be installed on the outer wall of the pipe to reduce heat loss during transportation.

[0026] Continue to refer to Figure 1 Because a single steam regulating valve is prone to malfunction leading to uncontrolled steam flow and consequently uncontrolled pressurization of heating unit 3, this embodiment provides a regulating unit 2 that includes at least one flow regulating component 210 to avoid affecting the pressurization effect of heating unit 3. The inlet of the flow regulating component 210 is used to connect to the main steam pipeline 220. The flow regulating component 210 can be composed of various valves such as a regulating valve, a bypass valve 212, and a shut-off valve 213. The regulating valve can be driven by pneumatic, electric, or hydraulic means. The flow regulating component 210 provided in this embodiment is provided with a pneumatic regulating valve 211 and a bypass valve 212 connected in parallel. A shut-off valve 213 is provided before and after the pneumatic regulating valve 211. The bypass valve 212 temporarily conducts steam when the pneumatic regulating valve 211 malfunctions to ensure continuous system operation. The shut-off valve 213 disconnects the pneumatic regulating valve 211 from the main steam pipeline 220 during maintenance, improving maintenance safety and enhancing the overall reliability and flexibility of steam regulation.

[0027] The pneumatic regulating valve 211 provided in this embodiment has its head or cylinder pressure set slightly higher than the original hot water pressure to allow pressurized steam to be introduced into the heating unit 3. A bypass valve 212 is connected in parallel with the pneumatic regulating valve 211, and is either a manual gate valve or a pneumatic butterfly valve with a diameter slightly smaller than the pneumatic regulating valve 211. This ensures stable air pressure throughout the system in case of a failure of the pneumatic regulating valve 211. A shut-off valve 213 is a high-temperature, high-pressure ball valve with good sealing performance and resistance to steam corrosion. It is installed at both ends of the pneumatic regulating valve 211 to disconnect the pneumatic regulating valve 211 from the steam delivery pipeline. A pressure valve and a safety valve are installed on the main steam pipeline 220 to prevent overpressure risks.

[0028] Continue to refer to the appendix Figure 1 and 2 In traditional heating devices, insufficient mixing of hot water and steam leads to localized overheating or uneven heating. The heating unit 3 provided in this embodiment includes a pipe heater 310 connected to a hot water valve and a steam pipe 320 passing through the pipe heater 310 and connected to the regulating unit 2. The steam pipe 320 has multiple vertical openings 321 and horizontal openings 322 on its output sidewall for steam release. By extending the steam pipe 320 into the pipe heater 310, steam is released from the vertical and horizontal openings 322 in multiple directions, ensuring sufficient contact with the input hot water, improving heating uniformity, and achieving heating of the hot water by superheated steam.

[0029] Referring again to Appendices 2 and 3, if the pipe heater 310 has only a straight cylindrical structure, the uniform flow velocity within the pipe results in low steam and hot water mixing efficiency. The pipe heater 310 includes a main cavity 311 and symmetrically located contraction cavities 312 at both ends of the main cavity 311. The contraction cavities 312 at both ends contract away from the main cavity 311. The inlet contraction cavity 312 gradually increases in cross-section along the hot water inflow direction, with a diffusion angle of 8°–15°. This ensures a smooth decrease in flow velocity as the hot water enters the main cavity 311 from the input pipe, resulting in uniform distribution within the main cavity 311. The reduced flow velocity allows for full contact with the released steam, improving mixing efficiency.

[0030] The pipe heater 310 provided in this embodiment is made entirely of stainless steel, which is resistant to high temperatures and corrosion. The main cavity 311 and the two end contraction cavities 312 are connected by flange sealing. The ratio of the diameter of the steam pipe 320 to the diameter of the main cavity 311 is 1:2-1:4, as shown in the attached figure. Figure 3 The vertical opening 321 and the horizontal opening 322 on the steam pipe 320 pass through the steam pipe 320 to form a spatial "+" shape. The two openings are the same size, and the opening size is selected as 40×10.

[0031] Continue to refer to the appendix Figure 2 and 3To ensure uniform mixing of superheated steam and hot water, the steam pipe 320 provided in this embodiment can be either a vertical pipe or an L-shaped pipe. This embodiment uses an L-shaped pipe, with part of its vertical section and the connecting horizontal section placed inside the main cavity 311. The steam pipe 320 is made of L-shaped stainless steel with good heat transfer efficiency. The heat from the superheated steam inside the steam pipe 320 can be pre-transferred to the flowing hot water through the pipe wall. The superheated steam released from the opening of the steam pipe 320 mixes with the hot water. During the mixing process, the released steam expands in volume and directly pressurizes the hot water. At the same time, the mixed hot water is heated, and the preheated hot water has better fluidity. The steam expansion pressure can be evenly transferred to the entire main cavity 311, so that the temperature and pressure parameters of the hot water meet the heat demand. During the operation of the device, hot water continuously flows into the main cavity 311, and steam is continuously injected and pressurized through the transmission of pressure carried by the original high-pressure conveyor, the spatial compression of the main cavity 311 by the released steam, and the thermal expansion of the hot water after heating. The mixed high-temperature and high-pressure medium continuously flows out from the outlet. When the steam injection rate reaches a dynamic balance with the hot water inflow and outflow, the main cavity 311 will maintain stable pressure parameters.

[0032] To ensure a continuous release of superheated steam from the opening, and in conjunction with the steam input control by the regulating unit 2, the output end of the steam pipe 320 provided in this embodiment is a closed blind end. This guarantees that all steam is released from the opening and mixes evenly with the flowing hot water.

[0033] Because the equipment is prone to vibration due to fluid impact during operation, which can easily cause loosening of pipe connections, the two ends of the contraction chamber 312 provided in this embodiment are respectively equipped with flexible connections 330. The flexible connections 330 absorb vibration and reduce equipment wear and noise. The flexible connections 330 are made of metal bellows or fluororubber bellows, which are resistant to high temperatures and are sealed to the flanges of the contraction chamber 312.

[0034] Continue to refer to the appendix Figure 1 Since the parameters of the heated and pressurized medium, such as temperature and pressure, cannot be monitored in real time, it is impossible to adjust them in time when the parameters exceed the standard, which affects the subsequent process. At the same time, single parameter monitoring is prone to adjustment failure due to sensor failure. The sensing unit 4 provided in this embodiment includes a temperature sensor 410 and a pressure sensor 420 installed at the outlet end of the pipeline heater 310. The two together provide feedback signals to the control unit 5 to control the action of the flow regulation component 210, that is, to control the pneumatic regulating valve 211, monitor the temperature and pressure of the outlet medium in real time, and control the pneumatic regulating valve 211 with dual parameter feedback, so that the steam volume can be quickly adjusted when any parameter deviates from the set value, thereby improving the reliability of parameter control.

[0035] The temperature sensor 410 provided in this embodiment is a K-type thermocouple or PT resistance thermometer, installed in the straight section of the outlet pipe. When the temperature is higher or lower than the set threshold, it sends a signal to the control unit 5, which controls the opening of the pneumatic regulating valve 211. The pressure sensor 420 is a strain gauge pressure transmitter, installed at a position offset from the temperature sensor 410 to avoid mutual interference. When the pressure at the outlet is higher or lower than the set threshold, it sends a signal to the control unit 5, which controls the opening of the pneumatic regulating valve 211. At the same time, shut-off valves can be set at both ends of the sensor to facilitate sensor maintenance.

[0036] Continue to refer to the appendix Figure 1 Since the electrical signal of the sensing unit 4 does not match the pneumatic driving signal of the pneumatic regulating valve 211, an intermediate component is needed to convert the signal. The control unit 5 provided in this embodiment adopts an electric valve positioner or a PLC controller. The sensing unit 4 needs to convert the electrical signal into a pneumatic signal to drive the diaphragm head or cylinder of the pneumatic regulating valve 211 to move, and finally adjust the opening degree of the pneumatic regulating valve 211.

[0037] If the pipe heater 310 leaks, it needs to be shut down for maintenance. When heating is interrupted, hot water remains in the pipe and needs to be drained for repair. Therefore, the hot water heating and pressurizing device provided in this embodiment also includes a bypass channel 6 on the pipe heater 310 for maintenance or repair. The bypass channel 6 is equipped with a valve, either an electric butterfly valve or a manual ball valve, connected in parallel with the pipe heater 310, and its diameter is the same as the main pipe.

[0038] Continue to refer to the appendix Figure 1 The heated and pressurized hot water is fed into the ethanol distillation unit 1000. However, the waste hot water after the reaction is completed is directly discharged, resulting in energy waste and low hot water utilization. Therefore, the hot water heating and pressurization device also includes a hot water tank 7. The inlet of the hot water tank 7 is connected to the hot water outlet of the ethanol distillation unit 1000, and the outlet of the hot water tank 7 is connected to the inlet of the hot water pump, forming a closed-loop circulation circuit. A branch of the hot water outlet of the ethanol distillation unit is also used to supply hot water to other processes. This recovers the waste hot water from the distillation unit, reduces system energy consumption, and improves the utilization rate of hot water resources.

[0039] Working principle: The initial hot water in the hot water tank 7 is transported to the heating unit 3 through the conveying unit 1. The fluid conveying device 110 provides power, and the flow control component 120 adjusts the flow rate. The hot water input is controlled according to the process requirements, and finally, it is directed into the inlet contraction cavity 312 of the heating unit 3 through the fluid input pipe.

[0040] Superheated steam enters regulating unit 2 from main steam pipeline 220. Isolation valve 213 controls whether steam enters regulating valve group. Pneumatic regulating valve 211 adjusts its opening according to the signal from control unit 5 to control the steam flow. Bypass valve 212 serves as a backup and temporarily conducts steam when pneumatic regulating valve 211 fails to ensure continuous system operation.

[0041] The regulated steam enters the main chamber 311 of the heating unit 3 through the L-shaped steam pipe 320. The initial hot water smoothly enters the main chamber 311 through the inlet contraction chamber 312 and flows evenly over the outer wall of the steam pipe 320. The superheated steam in the steam pipe 320 transfers heat to the hot water through the pipe wall, preheating the hot water and reducing the temperature difference during subsequent mixing.

[0042] The preheated hot water forms a stable turbulent flow within the main chamber 311. At this time, superheated steam is released from the vertical opening 321 and horizontal opening 322 at the end of the steam pipe 320. The steam mixes directly with the hot water, releasing a large amount of heat and heating the hot water to the target temperature. The high pressure of the steam itself is directly transferred to the hot water. At the same time, the steam occupies space in the closed main chamber 311, compressing the incompressible hot water. Combined with the slight volume expansion of the hot water after heating, this increases the pressure of the hot water to the target value. The outlet contraction chamber 312 allows the high-temperature and high-pressure medium to flow out smoothly and to the ethanol distillation unit, reducing pressure loss.

[0043] Temperature sensor 410 and pressure sensor 420 of sensing unit 4 monitor the temperature and pressure of the medium at the outlet of heating unit 3 in real time and transmit electrical signals to control unit 5. Control unit 5 converts the electrical signals into pneumatic pressure signals, driving the diaphragm or cylinder of pneumatic regulating valve 211 to actuate. If the outlet temperature / pressure is lower than the target value, the valve opening is increased, increasing the steam flow; if the outlet temperature / pressure is higher than the target value, the valve opening is decreased, reducing the steam flow. Through dynamic adjustment, the temperature and pressure of the outlet medium are stabilized within the set range.

[0044] If the pipeline heater 310 needs maintenance, open the bypass valve and hot water will be delivered directly through the bypass to avoid system shutdown.

[0045] The waste heat water generated by the ethanol distillation unit is divided into two paths: one path is directly transported to other processes to achieve energy cascade utilization; the other path enters the hot water tank 7, forming a closed loop with the heating and pressurizing device to recover waste heat and reduce energy consumption.

[0046] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A hot water heating and pressurizing device for supplying hot water that meets parameter requirements to an ethanol distillation unit (1000), characterized in that, include: The system includes a conveying unit (1) for conveying initial hot water, a regulating unit (2) for introducing superheated steam, a heating unit (3) for mixing the medium and increasing the temperature and pressure, and connected to the conveying unit (1) and the regulating unit (2) respectively, and a sensing unit (4) for real-time monitoring and feedback of signals. The regulating unit (2) and the sensing unit (4) are connected by a control unit (5) to regulate the steam flow rate.

2. The hot water heating and pressurizing device according to claim 1, characterized in that, The delivery unit (1) includes at least one fluid delivery device (110) and a flow control component (120) connected via a fluid input pipeline (130).

3. The hot water heating and pressurizing device according to claim 2, characterized in that, The regulating unit (2) includes at least one flow regulating component (210), the inlet of which is connected to the main steam pipeline (220).

4. The hot water heating and pressurizing device according to claim 3, characterized in that, The heating unit (3) includes a pipe heater (310) connected to the fluid input pipe (130) and a steam pipe (320) passing through the pipe heater (310) and connected to the regulating unit (2).

5. The hot water heating and pressurizing device according to claim 4, characterized in that, The steam pipe (320) is L-shaped, and part of the vertical section and the connected horizontal section of the steam pipe (320) are placed inside the main cavity (311).

6. The hot water heating and pressurizing device according to claim 4, characterized in that, The output end of the steam pipe (320) is a closed blind end, and its end sidewall has multiple openings for steam release.

7. The hot water heating and pressurizing device according to claim 4, characterized in that, The pipe heater (310) includes a main cavity (311) and contraction cavities (312) symmetrically located at both ends of the main cavity (311). The contraction cavities (312) at both ends contract toward the ends away from the main cavity (311).

8. The hot water heating and pressurizing device according to claim 4, characterized in that, The sensing unit (4) includes a temperature sensor (410) and a pressure sensor (420) installed at the outlet end of the pipe heater (310), which together provide feedback signals to the control unit (5) to control the operation of the flow regulating component (210).

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