Steam heating device and heat exchange system

Abstract

The utility model provides a steam heating device and a heat exchange system, and relates to the technical field of petrochemical equipment, and the steam heating device comprises a heating body which comprises an air inlet end and a discharge end; one end of the air inlet pipeline is connected with the air inlet end, so that steam is introduced to carry out heat exchange on a medium passing through the heating body; the supercharging device is connected with the air inlet pipeline so as to input pressurized air into the air inlet pipeline; and the pressure relief device is connected with the discharge end so as to discharge the steam, the pressurized gas and the condensate which pass through the heating body. According to the heating device and the heat exchange system provided by the utility model, the variability of the heat exchange area and the heat transfer efficiency is realized so as to adapt to the heat load change requirements under different working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, in particular to a steam heating device and a heat exchange system. Background Art

[0002] Steam heat exchangers are essential equipment in the petrochemical industry, widely used for heating and heat transfer of materials. Typically, steam enters the heat exchanger, primarily using sensible heat and latent heat of phase change to exchange heat with the medium, meeting the heating process medium requirements. After the steam undergoes phase change, it is then transported through the condensate pipe to the condensate recovery main for recycling and reuse. Because the condensate recovery main is typically located within a high-point pipe gallery, condensate recovery often requires the steam heat exchanger to maintain a certain back pressure to transport the steam condensate from the phase change to the condensate recovery network.

[0003] However, in actual production operations, due to the mismatch in temperature between the heating steam and the heated medium, the steam undergoes an instantaneous phase change upon entering the heat exchanger, resulting in an inability to maintain the pressure required to transport the condensate outward. Furthermore, when the designed heat load of the steam heating device does not match the actual heat load, or when adjustments are required to adjust the heat load to meet production requirements, the inlet steam flow rate needs to be throttled or limited. This results in low steam pressure within the heat exchanger after throttling, preventing the condensate from being properly transported outward. All of these situations can lead to the steam heat exchanger being filled to capacity, or even to an excessively high condensate level, causing condensate to enter the steam pipeline. This can cause the condensate to flow along with the steam, resulting in water hammer in the pipeline and potentially damaging the equipment. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a steam heating device and a heat exchange system to solve the problems of conventional steam heating devices in the prior art, such as difficulty in transporting condensate, difficulty in meeting high matching requirements for heat load, and single production adjustment method.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a steam heating device, comprising: a heating body, the heating body comprising an air inlet end and a discharge end; an air inlet pipeline, one end of the air inlet pipeline being connected to the air inlet end so as to allow steam to pass through to exchange heat with a medium passing through the heating body; a pressurizing device, the pressurizing device being connected to the air inlet pipeline so as to input pressurized gas into the air inlet pipeline; and a pressure relief device, the pressure relief device being connected to the discharge end so as to discharge steam, pressurized gas and condensate passing through the heating body.

[0006] In one embodiment of the present invention, the steam heating device further includes: a medium pipeline, which passes through the heating body to perform heat exchange with the steam in the heating body.

[0007] In one embodiment of the present invention, the discharge end includes: a first discharge port for discharging steam from the air intake line and pressurized gas from the booster device, and a second discharge port for discharging condensate formed after steam heat exchange.

[0008] In one embodiment of the present invention, the pressure relief device includes: a pressure relief line, which is connected to the first discharge port to discharge the steam in the intake line and the pressurized gas in the boost device; and a condensate recovery line, which is connected to the second discharge port to recover the condensate formed after steam heat exchange.

[0009] In one embodiment of the present invention, the boosting device includes: a boosting pipeline; and a boosting control valve, which is installed on the boosting pipeline to control the ram gas passing through the boosting pipeline.

[0010] In one embodiment of the present invention, the air intake line includes: a steam conduit; and a flow detection unit, which is installed on the steam conduit and electrically connected to the boost control valve to detect the steam flow rate flowing through the steam conduit. When the steam flow rate is lower than a predetermined value, the boost control valve is controlled to open to adjust the back pressure on the steam and condensate in the heating body.

[0011] In one embodiment of the present invention, the steam heating device also includes: a pressure detection unit, which is installed on the heating body. The pressure detection unit is electrically connected to the boost control valve to monitor the internal pressure of the heating body, and when the internal pressure of the heating body is lower than the set value, the boost control valve is controlled to open to adjust the internal pressure of the heating body.

[0012] In one embodiment of the present invention, the steam heating device also includes: a liquid level detection unit and an override control module. The liquid level detection unit is installed on the heating body. The liquid level detection unit is electrically connected to the override control module. The override control module is signal-connected to the pressure detection unit to detect the condensate height inside the heating body through the liquid level detection unit. When the condensate height is higher than the set value, a signal is sent to the pressure detection unit through the override control module, and the boost control valve is controlled to open through the pressure detection unit to adjust the condensate back pressure in the heating body.

[0013] In one embodiment of the present invention, the pressure relief line includes: a vent line; and a vent control valve, which is installed on the vent line. The vent control valve is electrically connected to the pressure detection unit to control the opening of the vent control valve when the pressure detection unit detects that the internal pressure of the heating body reaches a preset value.

[0014] The present invention also provides a heat exchange system, comprising the aforementioned steam heating device.

[0015] In summary, the steam heating device and heat exchange system proposed by the present invention have the following beneficial effects: Through the interaction between the intake pipeline and the booster device, when the intake pipeline transports steam to the heating body for heat exchange with the medium, if the pressure detection unit detects low internal pressure in the heating body, the booster control valve is controlled to open, allowing pressurized gas to enter the heating body through the booster pipeline to increase steam back pressure and improve condensate delivery efficiency. Furthermore, if the flow monitoring unit detects low steam flow in the steam conduit, the booster control valve can be further controlled to increase the condensate delivery flow rate of the heating body, thereby controlling the heating body to maintain a normal heat load. Furthermore, the liquid level detection unit can also send a signal to the pressure detection unit via the override control module in real time when the liquid level rises abnormally, for example, above a set value. The pressure detection unit then controls the booster control valve to open and close, increasing the condensate delivery back pressure and thereby reducing the condensate level in the heating body. By regulating the steam and condensate back pressure by introducing pressurized gas as described above, the internal pressure condition of the device body can be effectively improved, the heat exchange area and heat exchange efficiency between the cold and hot media in the heater can be reduced, and the applicable range of the heating body can be adjusted, especially when the heat transfer efficiency of the initial equipment is high and the heating device is not matched with the production load, which can have a good regulating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a steam heating device provided in an embodiment of the present invention.

[0017] Figure 2 Shown is a schematic structural diagram of a steam heating device provided by an embodiment of the present invention.

[0018] Component number description

[0019] Heating body 1; air intake pipeline 2; pressurizing device 3; pressure relief device 4; medium pipeline 5; pressure detection unit 6; liquid level detection unit 7; air intake end 11; discharge end 12; first discharge port 121; second discharge port 122; steam conduit 21; flow detection unit 22; steam control valve 23; pressurizing pipeline 31; pressurizing control valve 32; pressure relief pipeline 41; condensate recovery pipeline 42; venting pipeline 411; venting control valve 412; drain pipeline 421; drain valve 422. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0022] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0023] See also Figure 1 In one embodiment of the present invention, the present invention provides a steam heating device, including: a heating body 1, the heating body 1 including an air inlet end 11 and a discharge end 12; an air inlet pipeline 2, one end of the air inlet pipeline 2 is connected to the air inlet end 11, so as to pass steam to exchange heat with the medium passing through the heating body 1; a boosting device 3, the boosting device 3 is connected to the air inlet pipeline 2, so as to input pressurized gas into the air inlet pipeline 2; and a pressure relief device 4, the pressure relief device 4 is connected to the discharge end 12, so as to discharge steam, pressurized gas and condensate passing through the heating body 1.

[0024] In this embodiment, the heating body 1 can be a device body such as a heat exchanger that completes heat exchange with the medium by means of sensible heat or latent heat of phase change. During the heating process of the heating body 1, steam is input into the heating body 1 through the air intake line 2 to exchange heat with the medium. When the pressure value in the heating body 1 reaches a certain level, the pressure relief device 4 will deflate and empty the steam. At the same time, the pressure relief device 4 can further realize the external transportation of the condensate formed by the steam heat exchange. Furthermore, by connecting the boosting device 3 to the air intake line 2, the ram gas can be transported to the heating body 1 through the boosting device 3 and the air intake line 2 through the boosting device 3, the back pressure of the heating body 1 can be adjusted, and the condensate external transportation efficiency can be adjusted, thereby ensuring the constant system pressure. Specifically, when the steam flow rate from the air inlet line 2 to the heating body 1 is slow, the booster device 3 can be activated, allowing the ram gas to act on the air inlet line 2 and the heating body 1 through the booster device 3, thereby increasing the back pressure when the steam enters the heating body 1. When the ram gas enters the heating body 1, it further increases the back pressure when the condensate is transported out, thereby accelerating the efficiency of transporting the condensate out of the heating body 1. By introducing the ram gas in this manner, the efficiency of transporting the condensate out is improved while further reducing the heat exchange area and heat transfer efficiency of the heating device 1, thereby achieving the purpose of adjusting the adaptability range of the heating body 1, thereby reducing steam condensation and improving the low efficiency of transporting the condensate out of the heating body 1.

[0025] like Figure 1 and 2 As shown, in one embodiment of the present invention, the steam heating device further includes a medium pipeline 5, which passes through the heating body 1 to exchange heat with the steam within the heating body 1. In this embodiment, when the medium exchanges heat with the heating body 1, the medium pipeline 5 may enter from one end of the heating body 1 and be discharged from the other end of the heating body 1. The medium pipeline 5 may have a spiral shape within the heating body 1, which will not be described in detail here.

[0026] In one embodiment of the present invention, two discharge ports 12 can be provided: one for discharging non-condensable gases such as gaseous steam and ram gas, and the other for discharging condensate formed by steam heat exchange and condensation. Specifically, the discharge port 12 includes a first discharge port 121 for discharging steam from the intake line 2 and pressurized gas from the booster 3, and a second discharge port 122 for discharging condensate formed after steam heat exchange. In this embodiment, the discharge port 12 can include a first discharge port 121 and a second discharge port 122. The first discharge port 121 allows steam from the intake line 2 and ram gas from the booster 3 to be discharged when the pressure within the heating body 1 reaches a certain level; the second discharge port 122 allows condensate formed by steam heat exchange to be discharged. Furthermore, since condensate is often discharged through the bottom side, the second discharge port 122 can be located at the bottom side of the heating body 1. The steam and the ram gas are exhausted from the top side when passing through the heating body 1 , and therefore, the first exhaust port 121 may be provided at the top side of the heating body 1 .

[0027] In one embodiment of the present invention, when the pressure relief device 4 is releasing pressure, it can respectively complete the external delivery of steam, ram gas and condensate through the first discharge port 121 and the second discharge port 122. Specifically, the pressure relief device 4 includes: a pressure relief line 41, the pressure relief line 41 is connected to the first discharge port 121 to exhaust the steam in the intake line 2 and the pressurized gas in the boost device 3; and a condensate recovery line 42, the condensate recovery line 42 is connected to the second discharge port 122 to recover the condensate formed after the steam heat exchange. In this embodiment, by connecting the pressure relief line 41 to the first discharge port 121, it is possible to achieve pressure relief when the internal pressure of the heating body 1 reaches a certain level during the steam heat exchange process. And when the ram gas acts on the heating body 1, it is also possible to achieve the discharge of the ram gas and steam together. When condensate is generated by steam heat exchange, the condensate can be discharged into the condensate recovery pipeline 42 through the second discharge port 122 to be further transported outward.

[0028] In one embodiment of the present invention, when the ram gas is introduced into the intake line 2 through the boosting device 3 to act on the steam, the opening and closing of the boosting device 3 can be a controlled process. Specifically, the boosting device 3 includes a boosting line 31 and a boost control valve 32. The boost control valve 32 is mounted on the boosting line 31 to control the flow of ram gas through the boosting line 31. In this embodiment, the boost control valve 32 can be used to control the flow of ram gas through the boosting line 31 and into the intake line 2. For example, when the internal pressure in the heating body 1 is low, the condensate flow is slow, or the condensate level is high, the boost control valve 32 can be opened to allow the ram gas to be delivered through the boosting line 31 to the intake line 2. The ram gas then enters the heating body 1 along with the steam in the intake line 2. This increases the back pressure between the steam and condensate in the heating body 1, improves the efficiency of condensate removal from the heating body 1, and reduces the heat exchange area and heat exchange efficiency during heat exchange. It is worth noting that the boost control valve 32 can be a solenoid valve with an opening and closing function. Of course, it can also be a regulating valve with a function of regulating the flow rate of the ram gas.

[0029] In one embodiment of the present invention, the air intake line 2 includes a steam conduit 21 and a flow detection unit 22. The flow detection unit 22 is mounted on the steam conduit 21 and is electrically connected to a boost control valve 32 to detect the steam flow rate flowing through the steam conduit 21. When the steam flow rate falls below a predetermined value, the boost control valve 32 is controlled to open, thereby adjusting the back pressure on the steam and condensate within the heating body 1. In this embodiment, when heat is exchanged with the medium of the heating body 1, steam can be delivered to the heating body 1 through the steam conduit 21. During the delivery of the steam, the flow detection (FT) unit 22 can be used to monitor the steam flow rate corresponding to the inlet of the air intake end 11, thereby monitoring the heat load of the heating body 1. The normal heat load requirement can be further controlled by controlling the condensate flow rate discharged from the heating body 1. That is, by opening the boost control valve 32, the pressurized gas is transported to the heating body 1 through the boost pipeline 31 and the steam conduit 21 to adjust the condensate back pressure, speed up the delivery of the condensate, and increase the steam flow rate, thereby reducing the heat exchange area and heat exchange efficiency between the cold and hot media in the heating body 1.

[0030] In one embodiment of the present invention, when controlling the boost control valve 32 to introduce pressurized gas into the heating body 1, the opening and closing of the boost control valve 32 or the flow rate can be further determined by monitoring the internal pressure of the heating body 1. Specifically, the steam heating device further includes a pressure detection unit 6, which is mounted on the heating body 1 and electrically connected to the boost control valve 32 to monitor the internal pressure of the heating body 1. When the internal pressure of the heating body 1 is lower than a set value, the boost control valve 32 is controlled to open, thereby adjusting the internal pressure of the heating body 1. In this embodiment, the pressure detection (PT) unit 6 can be electrically connected to the boost control valve 32. When the pressure detection unit 6 detects that the internal pressure of the heating body 1 is low or lower than a certain set value, the pressure detection unit 6 can control the boost control valve 32 to open or adjust the flow opening of the boost control valve 32, and transport the pressurized gas to the heating body 1 through the boost pipeline 31 to increase the pressure of the steam in the heating body 1, and can also increase the back pressure on the condensate, accelerate the discharge of the condensate, and indirectly control the condensate level in the heating body 1.

[0031] In one embodiment of the present invention, when controlling the boost control valve 32 to introduce pressurized gas into the heating body 1, the opening and closing of the boost control valve 32 or the flow rate can be further determined by monitoring the liquid level within the heating body 1. Specifically, the steam heating device further includes a liquid level detection unit 7 and an override control module. The liquid level detection unit 7 is mounted on the heating body 1 and electrically connected to the override control module. The override control module is signal-connected to a pressure detection unit 6. The liquid level detection unit 7 detects the condensate level within the heating body 1. When the condensate level exceeds a set value, the override control module sends a signal to the pressure detection unit 6, which controls the opening of the boost control valve 32 to adjust the condensate back pressure within the heating body 1. In this embodiment, the liquid level detection unit 7 can monitor the condensate level within the heating body 1 to identify abnormal conditions, such as load changes or changes in steam quality, causing abnormal condensate level increases. Furthermore, when the liquid level detection unit 7 detects an abnormal increase in the liquid level, for example, when the liquid level height is detected to be higher than a certain set value, it will send this signal to the pressure detection unit 6 through the override control (HLO) module connected thereto, so that the pressure detection unit 6 will prioritize the signal as the control basis and issue a control instruction to the boost control valve 32, so that the boost control valve 32 is opened or closed, or the flow rate is adjusted, thereby adjusting the steam and condensate back pressure in the heating body 1 through the introduced pressurized gas.

[0032] In one embodiment of the present invention, a pressure relief line 41 can be used to release / drain pressure when the internal pressure of the heater body 1 is high. Specifically, the pressure relief line 41 includes a vent line 411 and a vent control valve 412. The vent control valve 412 is mounted on the vent line 411 and is electrically connected to the pressure detection unit 6. When the pressure detection unit 6 detects that the internal pressure of the heater body 1 has reached a preset value, the vent control valve 412 is controlled to open.

[0033] In this embodiment, when steam enters the heater body 1 through the air inlet line 2, the vent control valve 412 remains closed to maintain the internal pressure of the heater body 1. As the internal pressure of the heater body 1 continues to increase, when the pressure detection unit 6 detects that the internal pressure of the heater body 1 reaches a preset value, it further controls the vent control valve 412 to open, thereby releasing the internal pressure of the heater body 1.

[0034] It is worth noting that the pressurized gas can be an inert gas, such as nitrogen.

[0035] In one embodiment of the present invention, the condensate recovery line 42 includes a drain line 421 and a drain valve 422 installed on the drain line 421. The drain valve 422 can be used to close the drain line 421, thereby preventing the condensate from being transported out. When the drain valve 422 is opened, for example, the condensate can be quickly transported out of the heating body 1 through the drain line 421 under the back pressure provided by the pressurized gas.

[0036] See also Figure 1 In a preferred embodiment provided by the present invention, when the heat transfer efficiency of the heating body 1 is high, after the heating steam enters the heating body 1, the steam is instantly condensed into condensate, and the back pressure in the heating body 1 is low. The condensate cannot be transported to the pressure relief line 41 in the heating body 1 due to the lack of back pressure. By increasing the amount of heating steam to increase the back pressure of the facility, the heat load of the heating body 1 will not match the production demand. In this case, pressurized gas, such as inert gas, is introduced through the boost control valve 32. The pressure detection unit 6 monitors the internal pressure of the heating body 1. With the introduction of inert gas, the heat exchange area of ​​the heating body 1 is reduced, the steam condensation is improved, and the internal pressure is increased, and the condensate is transported more efficiently.

[0037] See also Figure 2In another preferred embodiment of the present invention, the heat load of the heater body 1 is controlled by monitoring the steam flow rate at the inlet of the air inlet line 2 via the flow detection (FT) unit 22, thereby controlling the condensate flow rate of the heater body 1 to meet the normal heat load requirement. The pressure detection (PT) unit 6 monitors the internal pressure changes of the heater body 1, introduces pressurized gas through the boost line 31, and discharges bleed air from the bleed line 411 to control the internal pressure of the heater 1 and indirectly control the condensate level within the equipment. When abnormal conditions such as load changes or changes in steam quality cause the condensate level to rise abnormally, the liquid level detection (LT) unit 7 is equipped with a condensate high level override (HLO) module. By transmitting the acquired abnormal signal to the pressure detection PT, pressurized gas is introduced to adjust the condensate level within the heater body 1 and to adjust the condensate level to outside, thereby improving the internal back pressure of the heater body 1 and suppressing the abnormal rise in the condensate level.

[0038] The present invention also provides a heat exchange system, comprising the aforementioned steam heating device.

[0039] In summary, the present invention, through the interaction between the air intake line 2 and the booster device 3, can achieve this by enabling, during the process of steam being transported from the air intake line 2 to the heating body 1 for heat exchange with the medium, when the pressure detection unit 6 detects low internal pressure in the heating body 1, to control the boost control valve 32 to open, allowing pressurized gas to enter the heating body 1 through the booster line 31 to increase the steam back pressure and improve the efficiency of condensate delivery. Furthermore, when the flow monitoring unit 22 detects low steam flow in the steam conduit 21, the boost control valve 32 can be further controlled to increase the condensate delivery flow rate from the heating body 1, thereby maintaining the heating body 1 under normal heat load conditions. Furthermore, the liquid level detection unit 7 can also send a signal to the pressure detection unit 6 via the override control module in real time when the liquid level rises abnormally, for example, above a set value. The pressure detection unit 6 then controls the opening and closing of the boost control valve 32 to increase the condensate delivery back pressure, thereby reducing the condensate level in the heating body 1. By regulating the steam and condensate back pressures through the introduction of pressurized gas, the internal pressure of the device body 1 can be effectively improved, the heat exchange area and efficiency between the hot and cold media in the heater can be reduced, and the applicable range of the heating body 1 can be adjusted, especially in situations where the heat transfer efficiency of the initial equipment is high or the heating device is not matched with the production load. Therefore, the utility model effectively overcomes the various shortcomings of the existing technology and has high industrial application value.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A steam heating device, characterized in that: include: A heating body (1), the heating body (1) comprising an air inlet end (11) and a discharge end (12); An air inlet line (2), one end of which is connected to the air inlet end (11) so as to allow steam to pass through to perform heat exchange on the medium passing through the heating body (1); a boosting device (3), the boosting device (3) being connected to the air intake line (2) to input pressurized gas into the air intake line (2); as well as A pressure relief device (4) is connected to the discharge end (12) to discharge steam, pressurized gas and condensate passing through the heating body (1).

2. The steam heating device according to claim 1, characterized in that: The steam heating device further comprises: a medium pipeline (5), wherein the medium pipeline (5) passes through the heating body (1) to perform heat exchange with the steam in the heating body (1).

3. The steam heating device according to claim 1, characterized in that: The discharge end (12) comprises: a first discharge port (121) for discharging steam from the air intake line (2) and pressurized gas from the booster device (3), and a second discharge port (122) for discharging condensate formed after steam heat exchange.

4. The steam heating device according to claim 3, characterized in that: The pressure relief device (4) comprises: a pressure relief line (41), the pressure relief line (41) being connected to the first discharge port (121) to discharge steam from the air intake line (2) and pressurized gas from the boosting device (3); and A condensate recovery pipeline (42) is connected to the second discharge port (122) to recover condensate formed after steam heat exchange.

5. The steam heating device according to claim 4, characterized in that: The boosting device (3) comprises: a pressurizing line (31); and A boost control valve (32) is installed on the boost pipeline (31) to control the flow of ram gas through the boost pipeline (31).

6. The steam heating device according to claim 5, characterized in that: The air intake line (2) comprises: a steam conduit (21); and A flow detection unit (22) is installed on the steam conduit (21). The flow detection unit (22) is electrically connected to the boost control valve (32) to detect the steam flow rate flowing through the steam conduit (21). When the steam flow rate is lower than a predetermined value, the boost control valve (32) is controlled to open to adjust the back pressure of the steam and condensate in the heating body (1).

7. The steam heating device according to claim 5, characterized in that: The steam heating device also includes: A pressure detection unit (6) is installed on the heating body (1). The pressure detection unit (6) is electrically connected to the boost control valve (32) to monitor the internal pressure of the heating body (1) and adjust the internal pressure of the heating body (1) by controlling the boost control valve (32) to open when the internal pressure of the heating body (1) is lower than a set value.

8. The steam heating device according to claim 7, characterized in that: The steam heating device also includes: A liquid level detection unit (7) and an override control module, wherein the liquid level detection unit (7) is mounted on the heating body (1), the liquid level detection unit (7) is electrically connected to the override control module, and the override control module is signal-connected to the pressure detection unit (6) so as to detect the condensate height inside the heating body (1) through the liquid level detection unit (7), and when the condensate height is higher than a set value, a signal is sent to the pressure detection unit (6) through the override control module, and the pressure detection unit (6) controls the pressure boost control valve (32) to open, thereby adjusting the condensate back pressure inside the heating body (1).

9. The steam heating device according to claim 7, characterized in that: The pressure relief line (41) comprises: a vent line (411); and A vent control valve (412) is installed on the vent pipeline (411). The vent control valve (412) is electrically connected to the pressure detection unit (6) so as to control the opening of the vent control valve (412) when the pressure detection unit (6) detects that the internal pressure of the heating body (1) reaches a preset value.

10. A heat exchange system, characterized in that: The invention comprises the steam heating device described in any one of claims 1 to 9.

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