A heating and cooling device for pipelines

Abstract

The present invention belongs to the technical field of pipeline temperature reduction and pressure reduction, and relates to a heat tracing temperature reduction and pressure reduction device for pipelines, comprising: a steam shunt pipe is connected to a heat exchange temperature reduction unit, the steam shunt pipe is suitable for guiding steam to pass through the heat exchange temperature reduction unit to increase the temperature of the temperature reduction water, a steam return pipe is connected between the temperature reduction pipe and the heat exchange temperature reduction unit, and the steam passing through the heat exchange temperature reduction unit returns to the temperature reduction pipe through the steam return pipe; the outlet shunt pipe is connected between the temperature reduction pipe and the steam return pipe, and the inlet shunt pipe is connected between the inlet pipe and the steam shunt pipe. The temperature of the temperature reduction water in the heat exchange temperature reduction unit is increased by using the temperature of the input steam, that is, the temperature of the temperature reduction water can be reasonably adjusted, and the energy-saving effect can be achieved, and the input steam can also be recovered; according to the actual situation, high-pressure steam and reduced-pressure steam are used respectively to achieve accurate and stable temperature and pressure control to meet the requirements of pipelines, equipment and processes.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline temperature reduction and pressure reduction, and in particular, relates to a heating temperature reduction and pressure reduction device for a pipeline. Background Art

[0002] Pipeline heating refers to a heat preservation measure taken to prevent the materials in pipelines, equipment or containers from solidifying or freezing in low temperature environments or to maintain process temperatures. The heating system usually provides heat to pipelines and containers through external heating to ensure that the internal medium is in suitable flow or storage conditions. Common heating methods include: electric heating, hot water heating / steam heating, hot air heating, industrial heating cables, etc. The cooling water in the cooling and pressure reduction device needs to be heated and then the temperature is adjusted using the cooling water.

[0003] In practical applications of temperature and pressure reduction devices, there are always certain fluctuations in steam pressure control. If the outlet set temperature is very close to the saturation temperature under the steam working pressure, when the pressure fluctuates, the set temperature may be lower than the saturation temperature of the steam, and part of the steam in the pipeline will condense into water droplets, resulting in steam-water two-phase flow.

[0004] And when the set temperature is very close to the saturation temperature under the steam working pressure, if the temperature of the injected cooling water is below 50℃, it will cause the temperature field in the steam pipe to be uneven, and the injected cooling water will be difficult to evaporate completely and will be suspended in the steam. These condensed water droplets or incompletely evaporated water droplets will adhere to the surface of the temperature sensor, causing the temperature sensor to collect the wrong temperature, causing large fluctuations in temperature control.

[0005] The cooling water temperature is a very critical parameter, which directly affects the cooling water volume and the rate at which the cooling water is converted from water to steam. When the cooling water temperature is higher, the water tension is smaller, and the closer to the saturation temperature, the easier it is to evaporate. In addition, when the cooling water is sprayed into the pipeline, the higher the temperature, the easier it is to atomize, and the smaller the droplets produced are, and small droplets evaporate faster than large droplets.

[0006] At this time, a heating, cooling and pressure reducing device for pipelines is needed. The diversion is used to allow the steam to pass through the heat exchanger to heat the cooling water, increase the cooling water temperature in the heat exchange cooling system, and maintain the cooling water temperature. The steam then flows back to the pipeline and the heated cooling water is sent to the nozzle. The high-temperature water enters the nozzle and is fully mixed with the steam and evaporates quickly, thereby improving the overall performance of the system. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a cooling device capable of regulating water temperature by introducing a diversion to allow steam to pass through a heat exchanger, raising the temperature of cooling water in a heat exchange cooling system, and then allowing the steam to flow back into the pipeline.

[0008] In order to solve the above technical problems, the present invention provides a heating and cooling and pressure reducing device for pipelines, comprising: an inlet pipe, a cooling pipe, a steam pressure reducing valve, a heat exchange cooling unit, a steam shunt pipe, a steam reflux pipe, an outlet shunt pipe, an inlet shunt pipe and a flow regulating valve, wherein the inlet pipe and the cooling pipe are respectively connected to the inlet and outlet of the steam pressure reducing valve, the cooling pipe is connected to the heat exchange cooling unit, and the heat exchange cooling unit is used to transport cooling water to the cooling pipe; the heat exchange cooling unit is connected to the steam shunt pipe, and the steam shunt pipe is suitable for guiding steam to the heat exchange cooling unit. The cooling unit is used to increase the temperature of the cooling water, and at the same time, the heat exchange cooling unit and the cooling water therein are subjected to heat treatment. The steam reflux pipe is connected between the cooling pipe and the heat exchange cooling unit, and the steam passing through the heat exchange cooling unit is refluxed to the cooling pipe through the steam reflux pipe; the outlet diversion pipe is connected between the cooling pipe and the steam reflux pipe, and the inlet diversion pipe is connected between the inlet pipe and the steam diversion pipe. The outlet diversion pipe, the inlet diversion pipe and the steam diversion pipe are connected through a three-way joint, and flow regulating valves are installed on the steam reflux pipe, the outlet diversion pipe and the inlet diversion pipe.

[0009] Preferably, it also includes: a steam check valve, and the outlet diverter pipe and the inlet diverter pipe are both provided with a steam check valve.

[0010] Preferably, the heat exchange cooling unit includes: a heat exchanger body connected to the steam diversion pipe and the steam return pipe, and a water pipe running through the heat exchanger body and the cooling pipe; an atomizing nozzle located in the cooling pipe is installed at the output end of the water pipe, and cooling water is sprayed into the cooling pipe by the atomizing nozzle; a cooling water thermometer is installed on the water pipe, and the cooling water thermometer is located between the heat exchanger body and the cooling pipe.

[0011] Preferably, it also includes: a pressure pump and a cooling water check valve. The water pipe has a spirally coiled winding portion, and the winding portion on the water pipe is located in the heat exchanger body. The heat exchange area of ​​the water pipe in the heat exchanger body is increased by the winding portion to ensure the heat exchange effect; a pressure pump and a cooling water check valve are installed at the input end of the water pipe. The pressure pump provides sufficient input pressure for the input cooling water, and the check valve prevents the input cooling water from flowing back.

[0012] Preferably, it also includes: an outlet pipe, a safety valve, a pressure gauge and a steam thermometer. The safety valve is installed on the cooling pipe; the outlet end of the cooling pipe is connected to the outlet pipe, and the outlet pipe is installed with a pressure gauge for measuring the pressure of the final discharged steam and a steam thermometer for measuring the temperature of the final discharged steam.

[0013] Preferably, it also includes: an inner through pipe, an inner through pipe is arranged inside the cooling pipe, the inner through pipe is installed on the inner bottom side of the cooling pipe through a mounting seat, the inner through hole of the inner through pipe is concentric with the cooling pipe, the atomizing nozzle is arranged inside the inner through pipe, and the inner through pipe replaces the cooling pipe to receive the cooling water sprayed by the atomizing nozzle.

[0014] Preferably, the inner hole of the inner tube is a structure that expands at both ends and narrows in the middle, the atomizing nozzle is arranged at the narrowed part of the inner tube, and the spray direction of the atomizing nozzle is away from the inlet end of the inner tube to prevent the input steam from affecting the atomizing nozzle, wherein the inlet end of the inner tube is facing the input direction of the steam.

[0015] Preferably, the end of the steam return pipe is bent in the temperature reduction pipe, and the bent end pipe opening of the steam return pipe corresponds to the inlet of the inner through hole of the inner through pipe.

[0016] Preferably, it also includes: a venturi tube, a venturi tube is provided in the cooling tube and is located between the outlet end of the cooling tube and the outlet end of the inner tube, the venturi tube and the cooling tube are sealed, a sealing ring is connected between the outer side of the venturi tube and the inner side of the cooling tube, the inlet section of the venturi tube surrounds the outlet end of the inner tube, and the length surrounded by the venturi tube is one quarter of the length of the inner tube.

[0017] Preferably, the safety valve is located between the outlet end of the desuperheating pipe and the outlet end of the venturi tube, and is suitable for maintaining the pressure of the steam that is ultimately required to be discharged.

[0018] The present invention overcomes the shortcomings of the prior art and can achieve the following beneficial effects:

[0019] 1. The temperature of the cooling water in the heat exchange cooling unit can be increased by using the temperature of the input steam, which can reasonably adjust the temperature of the cooling water and achieve energy-saving effects. The input steam can also be recovered. According to the actual situation, high-pressure steam and reduced-pressure steam are used respectively to achieve precise and stable temperature and pressure control under limited installation conditions on site to meet the requirements of pipelines, equipment and processes.

[0020] 2. The temperature of the cooling water after cooling treatment is measured by the cooling water thermometer, so as to facilitate the use of high-pressure steam and reduced-pressure steam according to the actual needs; the pressure in the cooling pipe is maintained within the set pressure range through the safety valve to ensure the safety of the cooling device.

[0021] 3. Through the design of the inner through pipe and the Venturi tube, the cooling water is prevented from directly contacting the cooling pipe, which causes excessive temperature fluctuations and excessive alternating stress and damage, thereby improving the safety and reliability of the cooling and pressure reduction system. In addition, the atomization effect of the cooling water can be improved by utilizing the phenomenon of increased speed and reduced pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an assembly schematic diagram of the present invention.

[0023] Figure 2 It is the front view of the present invention.

[0024] Figure 3 It is a partial schematic diagram of the present invention.

[0025] Figure 4 It is a schematic diagram of the heat exchanger body and the water pipe of the present invention.

[0026] Figure 5 It is a full cross-sectional schematic diagram of the temperature reduction tube of the present invention.

[0027] Figure 6 It is a full cross-sectional schematic diagram of the inner tube and the venturi tube of the present invention.

[0028] Figure 7 For the present invention Figure 6 Enlarged view of point A in .

[0029] Figure 8 This is a table of basic physical properties of water on the saturated line in the "Heat Transfer Handbook" of the Ministry of Chemical Industry.

[0030] The markings in the accompanying drawings provided by the present invention are: 101-inlet pipe, 102-cooling pipe, 103-outlet pipe, 1031-pressure gauge, 1032-steam thermometer, 2-steam pressure reducing valve, 3-safety valve, 4-heat exchange cooling unit, 41-heat exchanger body, 42-water pipe, 420-winding part, 421-atomizing nozzle, 422-pressure pump, 423-cooling water check valve, 424-cooling water thermometer, 431-steam diverter pipe, 432-steam reflux pipe, 44-outlet diverter pipe, 45-inlet diverter pipe, 46-steam check valve, 47-flow regulating valve, 51-internal pipe, 52-Venturi tube. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Embodiment 1: A heating and cooling device for a pipeline, such as Figure 1-Figure 3As shown, it includes: an inlet pipe 101, a cooling pipe 102, a steam pressure reducing valve 2, a heat exchange cooling unit 4, a steam diverter pipe 431, a steam reflux pipe 432, an outlet diverter pipe 44, an inlet diverter pipe 45 and a flow regulating valve 47. The inlet pipe 101 and the cooling pipe 102 are respectively connected to the inlet and outlet of the steam pressure reducing valve 2. The input steam passes through the inlet pipe 101 and enters the cooling pipe 102 after being reduced in pressure by the steam pressure reducing valve 2. The cooling pipe 102 is connected to the heat exchange cooling unit 4. The heat exchange cooling unit 4 is used to transport cooling water to the cooling pipe 102. The transported cooling water will be mixed with the cooling pipe 102. The steam flowing in 102 is mixed, thereby realizing the temperature reduction and pressure reduction of the steam; the heat exchange cooling unit 4 is connected with a steam shunt pipe 431, and the steam shunt pipe 431 is suitable for guiding the above-mentioned input steam to pass through the heat exchange cooling unit 4 to increase the temperature of the cooling water. In this way, according to the nature of water and the heat exchange principle, the temperature of the cooling water in the heat exchange cooling unit 4 is increased by utilizing the temperature of the input steam, and the thermodynamic characteristics of the cooling water are improved, and the following aspects are affected: surface tension, water droplet size distribution, potential heat of atomization, and atomization rate, which is beneficial to the atomization of the cooling water, and at the same time, the input steam is used to increase the temperature of the cooling water in the heat exchange cooling unit 4. The steam introduced will also heat the heat exchange cooling unit 4 and the cooling water therein to prevent the cooling water in the heat exchange cooling unit 4 from solidifying or freezing in a low temperature environment or to maintain the temperature of the heat exchange cooling unit 4 to ensure the insulation effect of the cooling water. The cooling pipe 102 and the heat exchange cooling unit 4 are connected with a steam return pipe 432. The steam passing through the heat exchange cooling unit 4 flows back to the cooling pipe 102 through the steam return pipe 432. The used steam is recycled, and the recycled steam is cooled again due to heat exchange, so that the recycled steam can also achieve cooling function. Energy, reducing the need for cooling water, achieving energy-saving effect; the outlet shunt pipe 44 is connected between the cooling pipe 102 and the steam return pipe 432, the inlet shunt pipe 45 is connected between the inlet pipe 101 and the steam shunt pipe 431, the outlet shunt pipe 44, the inlet shunt pipe 45 and the steam shunt pipe 431 are connected through a three-way joint, if the input steam flows from the inlet shunt pipe 45 into the steam shunt pipe 431, and then is used in the heat exchange cooling unit 4, then the enthalpy value of the high-pressure steam is higher at this time, and the heat can be transferred to the cooling water before the pressure is reduced, so as to maximize the use of the thermal energy of the steam;If the input steam flows from the outlet shunt pipe 44 to the steam shunt pipe 431 and is then used in the heat exchange cooling unit 4, the steam flow and pressure after decompression are stable, and the heat exchange process can be controlled relatively accurately. The steam return pipe 432, the outlet shunt pipe 44 and the inlet shunt pipe 45 are all equipped with a flow regulating valve 47. The flow regulating valve 47 is controlled to adjust the flow of steam in the pipeline, thereby controlling the residence time of the flow in the steam return pipe 432 and the flow rate of the steam in the outlet shunt pipe 44 and the inlet shunt pipe 45. Therefore, the two methods of high-pressure steam and reduced-pressure steam can be used respectively according to actual conditions to achieve accurate and stable temperature and pressure control under limited installation conditions on site, meeting pipeline, equipment and process requirements. ;

[0034] like Figure 3 As shown, it also includes: a steam check valve 46. The outlet diverter pipe 44 and the inlet diverter pipe 45 are both provided with a steam check valve 46. The steam check valve is used to prevent the steam entering the outlet diverter pipe 44 and the inlet diverter pipe 45 from flowing back.

[0035] like Figure 2-Figure 4 As shown, the heat exchange cooling unit 4 includes: a heat exchanger body 41 connected to a steam diversion pipe 431 and a steam return pipe 432, and a water pipe 42 running through the heat exchanger body 41 and the cooling pipe 102; the steam flows through the heat exchanger body 41, thereby performing a heat treatment on the heat exchanger body 41 and the water pipe 42 therein, thereby heating the cooling water and maintaining a certain temperature, and the output end of the water pipe 42 is installed with an atomizing nozzle 42 located in the cooling pipe 102 1. The atomizing nozzle 421 sprays cooling water into the cooling pipe 102, so that the heated cooling water is atomized and mixed with steam in the cooling pipe 102 to reduce the temperature. A cooling water thermometer 424 is installed on the water pipe 42. The cooling water thermometer 424 is located between the heat exchanger body 41 and the cooling pipe 102. The cooling water thermometer 424 measures the temperature of the cooling water after the cooling treatment, so as to facilitate the use of high-pressure steam and reduced-pressure steam according to actual needs.

[0036] like Figure 3 As shown, it also includes: a pressure pump 422 and a cooling water check valve 423. The water pipe 42 has a spirally wound winding portion 420. The winding portion 420 on the water pipe 42 is located in the heat exchanger body 41. The heat exchange area of ​​the water pipe 42 in the heat exchanger body 41 is increased by the winding portion 420 to ensure the heat exchange effect. The input end of the water pipe 42 is installed with a pressure pump 422 and a cooling water check valve 423. The pressure pump 422 provides sufficient input pressure for the input cooling water, and the check valve prevents the input cooling water from flowing back.

[0037] like Figure 2As shown, it also includes: an outlet pipe 103, a safety valve 3, a pressure gauge 1031 and a steam thermometer 1032. The safety valve 3 is installed on the cooling pipe 102, and the pressure in the cooling pipe 102 is maintained within a set pressure range through the safety valve 3 to ensure the safety of the cooling device; the outlet end of the cooling pipe 102 is connected to the outlet pipe 103, and the outlet pipe 103 is installed with a pressure gauge 1031 for measuring the pressure of the final discharged steam and a steam thermometer 1032 for measuring the temperature of the final discharged steam.

[0038] like Figure 5-Figure 7 As shown, it also includes: an inner tube 51, the inner tube 51 is arranged in the cooling tube 102, the inner tube 51 is installed on the inner bottom side of the cooling tube 102 through a mounting seat, the inner hole of the inner tube 51 is concentric with the cooling tube 102, the atomizing nozzle 421 is arranged inside the inner tube 51, and the inner tube 51 replaces the cooling tube 102 to receive the cooling water sprayed by the atomizing nozzle 421, so as to avoid the cooling water from being directly sprayed onto the cooling tube 102, and prevent the cooling tube 102 from being subjected to both the heat of the steam and the cooling of the cooling water, thereby reducing the alternating stress that the cooling tube 102 needs to bear, and improving the safety and reliability of the cooling and pressure reduction system.

[0039] like Figure 7 As shown, the inner hole of the inner tube 51 is a structure that expands at both ends and narrows in the middle. The atomizing nozzle 421 is arranged at the narrowed part of the inner tube 51, and the spray direction of the atomizing nozzle 421 is opposite to the inlet end of the inner tube 51 to prevent the input steam from affecting the atomizing nozzle 421. The inlet end of the inner tube 51 is facing the input direction of the steam, and the speed of the fluid passing through the narrowed part of the inner tube 51 is increased and the pressure is reduced. Therefore, when the input steam passes through, it will have an adsorption effect on the surrounding area, and the cooling water sprayed by the atomizing nozzle 421 will be adsorbed, thereby improving the atomization effect of the cooling water and allowing it to be fully mixed with the steam.

[0040] like Figure 6 As shown, the end of the steam return pipe 432 is bent in the cooling pipe 102, and the bent end of the steam return pipe 432 corresponds to the inlet of the inner hole of the inner pipe 51. The utilized steam passing through the heat exchange cooling unit 4 will directly flow back to the inner pipe 51 in the cooling pipe 102 through the steam return pipe 432, so that the steam can further exchange heat with the cooling water sprayed in the inner pipe 51, and at the same time help stabilize the cooling process and avoid excessive temperature fluctuations.

[0041] like Figure 5 and Figure 6As shown, it also includes: a venturi tube 52, a venturi tube 52 is provided in the cooling tube 102 and is located between the outlet end of the cooling tube 102 and the outlet end of the inner tube 51, the venturi tube 52 and the cooling tube 102 are sealed, a sealing ring is connected between the outer side of the venturi tube 52 and the inner side of the cooling tube 102, the inlet section of the venturi tube 52 surrounds the outlet end of the inner tube 51, and the length surrounded by the venturi tube 52 is one quarter of the length of the inner tube 51. The steam in the cooling tube 102 that enters the inner tube 51 and the steam that does not enter the inner tube 51 will eventually be mixed in the venturi tube 52, so as to ensure the consistency of the pressure and temperature of the steam that needs to be discharged in the end on the basis of the aforementioned function of the inner tube 51.

[0042] like Figure 6 As shown, the safety valve 3 is located between the outlet end of the temperature reduction pipe 102 and the outlet end of the venturi tube 52. The safety valve 3 arranged at this position is suitable for maintaining the pressure of the steam that needs to be discharged in the end.

[0043] like Figure 8 As shown in the table, it can be seen that as the water temperature increases, the thermal enthalpy of water increases, the kinematic viscosity decreases, the dynamic viscosity decreases significantly, and the expansion coefficient increases. Therefore, based on the properties of water, increasing the temperature of the cooling water can achieve rapid evaporation after cooling and reduce the hydrophobic effect.

[0044] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. They only express the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention.

[0045] It should be pointed out that, for ordinary technicians in this field, several modifications, increases and decreases in quantity, improvements and substitutions can be made without departing from the concept of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A heating and cooling device for a pipeline, comprising: Steam pressure reducing valve (2); An inlet pipe (101) and a temperature reducing pipe (102) respectively connected to the inlet and outlet of the steam pressure reducing valve (2); A heat exchange cooling unit (4) connected to the cooling pipe (102), wherein the heat exchange cooling unit (4) is used to transport cooling water; It is characterized in that Also included are: The steam shunt pipe (431) is connected to the heat exchange desuperheating unit (4), wherein the steam shunt pipe (431) is suitable for guiding the steam to pass through the heat exchange desuperheating unit (4) to increase the temperature of desuperheating water, and at the same time, heat tracing treatment is performed on the heat exchange desuperheating unit (4) and the desuperheating water therein; Connecting the steam return pipe (432) between the cooling pipe (102) and the heat exchange cooling unit (4), so that the steam passing through the heat exchange cooling unit (4) flows back to the cooling pipe (102) through the steam return pipe (432); an outlet flow splitter pipe (44) connected between the temperature reduction pipe (102) and the steam return pipe (432), and an inlet flow splitter pipe (45) connected between the inlet pipe (101) and the steam flow splitter pipe (431); Flow regulating valves (47) are installed on the steam return pipe (432), the outlet branch pipe (44) and the inlet branch pipe (45); The heat exchange and cooling unit (4) comprises: A heat exchanger body (41) connected to the steam diversion pipe (431) and the steam return pipe (432), and a water delivery pipe (42) passing through the heat exchanger body (41) and the temperature reduction pipe (102); Atomizing nozzle (421), the output end of the water delivery pipe (42) is provided with an atomizing nozzle (421) located in the cooling pipe (102), and the atomizing nozzle (421) sprays cooling water into the cooling pipe (102); A cooling water thermometer (424) installed on the water delivery pipe (42), the cooling water thermometer (424) being located between the heat exchanger body (41) and the cooling pipe (102); Also included are: A pressure pump (422) and a cooling water check valve (423), wherein the input end of the water delivery pipe (42) is provided with a pressure pump (422) and a cooling water check valve (423); The water delivery pipe (42) has a spirally wound winding portion (420), and the winding portion (420) on the water delivery pipe (42) is located inside the heat exchanger body (41); Also included are: A safety valve (3) installed on the temperature reducing pipe (102); An outlet pipe (103) connected to the outlet end of the temperature reducing pipe (102), the outlet pipe (103) being provided with a pressure gauge (1031) for measuring the pressure of the steam finally discharged and a steam thermometer (1032) for measuring the temperature of the steam finally discharged; Also included are: An inner through pipe (51) is disposed in the cooling pipe (102), wherein the inner through hole of the inner through pipe (51) is concentric with the cooling pipe (102); The atomizing nozzle (421) on the water delivery pipe (42) is arranged inside the inner tube (51), and the inner tube (51) replaces the cooling tube (102) to receive the cooling water sprayed by the atomizing nozzle (421); The inner through hole of the inner through pipe (51) is a structure with expansion at both ends and narrowing in the middle; the atomizing nozzle (421) is arranged at the narrowed portion of the inner through pipe (51), and the spray direction of the atomizing nozzle (421) is facing away from the inlet end of the inner through pipe (51); The end of the steam return pipe (432) is bent inside the temperature reduction pipe (102), and the pipe opening of the bent end of the steam return pipe (432) corresponds to the inlet of the inner through hole of the inner through pipe (51); Also included are: The venturi tube (52) is provided in the cooling tube (102) and is located between the outlet end of the cooling tube (102) and the outlet end of the inner tube (51). The venturi tube (52) and the cooling tube (102) are sealed. The inlet section of the venturi tube (52) surrounds the outlet end of the inner tube (51).

2. A heating and cooling and pressure reducing device for pipelines according to claim 1, characterized in that: Also included are: Steam check valve (46): The outlet branch pipe (44) and the inlet branch pipe (45) are both provided with a steam check valve (46).

3. A heating and cooling and pressure reducing device for pipelines according to claim 2, characterized in that ； The safety valve (3) is located between the outlet end of the desuperheating pipe (102) and the outlet end of the venturi tube (52), and is suitable for maintaining the pressure of the steam that needs to be discharged in the end.

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