Steam heat exchanger purging system and control method thereof

Abstract

The invention discloses a steam heat exchanger purging system and a control method thereof, and the steam heat exchanger purging system comprises a steam heat exchanger, a heat exchange pipeline is arranged in the steam heat exchanger; the air supply device comprises an air compressor and a buffer tank, and the air compressor is connected with a first air inlet of the buffer tank; the purging air inlet pipeline is connected between the air outlet of the buffer tank and the steam inlet of the heat exchange pipeline, and an air inlet control valve is arranged on the purging air inlet pipeline; the condensate water discharge pipeline is connected with the condensate water outlet of the heat exchange pipeline, and a drain valve group is arranged on the condensate water discharge pipeline; the pressure gauge is arranged at a condensate water outlet of the heat exchange pipeline; and the controller is electrically connected with the air compressor, the air inlet control valve, the pressure gauge and the drain valve group. By arranging the air supply device and the purging air inlet pipeline, the steam heat exchanger can be automatically purged after being stopped, the water attack phenomenon is reduced, the steam heat exchanger is protected, automatic pressing leakage detection can be achieved, and the maintenance process is simplified.

Description

Technical Field

[0001] This application belongs to the technical field of steam heat exchanger purging, and particularly relates to a steam heat exchanger purging system and its control method. Background Art

[0002] At present, industrial tail gas is usually recycled in the form of combustion heating or power generation, which will emit a large amount of pollutants such as CO2, SO2 and dust. However, directly converting industrial tail gas into liquid ethanol and microbial protein can effectively reduce the emissions of CO2, SO2 and particulate matter caused by combustion, and has a positive effect on controlling haze weather and protecting the environment.

[0003] The production of ethanol by gas fermentation is a new technology that uses carbon monoxide as a carbon source to produce ethanol through microbial fermentation. After the fermentation wastewater is distilled to extract ethanol, the wastewater contains a certain amount of microbial protein, which greatly increases the difficulty of sewage treatment. At the same time, the microbial protein in the wastewater has a single component and a high crude protein content, and is a high-value-added protein feed that can be widely used in aquaculture and livestock feeding. The microbial protein powder can replace a part of fish meal in the feed industry to reduce the dependence on high-grade protein feed for marine fish, and has great environmental and economic significance.

[0004] A steam heat exchanger is a device that heats water or air with steam as a heat source. It can fully displace a large amount of heat value in the steam to heat water or air. During the extraction and drying process of ethanol and microbial protein, the steam heat exchanger is used to heat the air naturally inhaled by the fan and input it into the drying tower for drying the ethanol clostridium protein in the mash.

[0005] Generally, when the general steam heat exchange system is started, the "water hammer" phenomenon of the steam heat exchanger is serious, which is easy to cause leakage at the welded joints of the pipe elbows, bring condensate water into the drying equipment, damage the drying of the protein powder, and at the same time, it is easy to cause powder hanging and blockage on the inner wall of the drying equipment. Summary of the Invention

[0006] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application proposes a steam heat exchanger purging system and its control method, which can realize automatic purging of the steam heat exchanger when it stops, reduce the water hammer phenomenon, protect the steam heat exchanger, and can also automatically pressurize and leak check, simplifying the maintenance process.

[0007] In a first aspect, this application provides a steam heat exchanger purging system, which includes:

[0008] A steam heat exchanger, in which a heat exchange pipeline is provided;

[0009] An air supply device, including an air compressor and a buffer tank, and the air compressor is connected to the first air inlet of the buffer tank;

[0010] The purging inlet pipeline is connected between the air outlet of the buffer tank and the steam inlet of the heat exchange pipeline, and an air inlet control valve is provided on the purging inlet pipeline;

[0011] The condensate discharge pipeline is connected to the condensate outlet of the heat exchange pipeline, and a steam trap group is provided on the condensate discharge pipeline;

[0012] The pressure gauge is provided at the condensate outlet of the heat exchange pipeline;

[0013] The controller is electrically connected to the air compressor, the air inlet control valve, the pressure gauge and the steam trap group.

[0014] According to the steam heat exchanger purging system of the present application, by setting the air supply device and the purging inlet pipeline, when the steam heat exchanger stops, compressed air can be introduced through the air supply device and the purging inlet pipeline for automatic purging, blowing out the residual condensate in the heat exchange pipeline, reducing the water hammer phenomenon, protecting the steam heat exchanger. After purging, the air supply device can also automatically pressurize, and cooperate with the pressure gauge and the air inlet control valve to achieve automatic leak detection, simplify the maintenance process, and ensure the stable use of the system.

[0015] According to an embodiment of the present application, the steam heat exchanger purging system further includes a purging outlet pipeline, the purging outlet pipeline is connected to the condensate discharge pipeline, the condensate discharge pipeline extends in the horizontal direction, the purging outlet pipeline is vertically connected to the upper side of the condensate discharge pipeline, and an air outlet control valve is provided on the purging outlet pipeline, and the air outlet control valve is electrically connected to the controller.

[0016] According to an embodiment of the present application, the purging outlet pipeline is connected to the second air inlet of the buffer tank, and a gas-liquid separator is provided on the purging outlet pipeline.

[0017] According to an embodiment of the present application, two precision filters are provided on the purging inlet pipeline, the two precision filters are arranged in parallel, and the precision filters are electrically connected to the controller.

[0018] According to an embodiment of the present application, a flow meter is provided on the condensate drain pipeline, and the flow meter is electrically connected to the controller.

[0019] According to an embodiment of the present application, the heat exchange pipeline is in a meandering shape, and a detachable maintenance panel is provided at the position corresponding to the bending part of the heat exchange pipeline on the outer shell of the steam heat exchanger.

[0020] According to an embodiment of the present application, the steam heat exchanger includes a plurality of heat exchange pipelines;

[0021] The purging inlet pipeline includes an air inlet main pipe connected to the air outlet of the buffer tank, and a plurality of air inlet branch pipes connected between the air inlet main pipe and each heat exchange pipeline, and an air inlet control valve is provided on the air inlet branch pipe;

[0022] The purging outlet pipeline includes an outlet main pipe connected to the second air inlet of the buffer tank, and a plurality of outlet branch pipes connected between the outlet main pipe and each heat exchange pipeline. An outlet control valve is provided on the outlet branch pipe;

[0023] The condensate discharge pipeline includes a condensate discharge main pipe, and a plurality of condensate discharge branch pipes connected between the condensate discharge main pipe and the condensate outlets of each heat exchange pipeline. A steam trap group is provided on the condensate discharge branch pipe.

[0024] In a second aspect, the present application provides a control method for a steam heat exchanger purging system based on any one of the technical solutions in the first aspect. A steam pipeline connected to the air inlet of the heat exchange pipeline is provided in the steam heat exchanger. A steam control valve is provided on the steam pipeline, and the steam control valve is electrically connected to a controller. The control method includes:

[0025] Obtain the pressure value of the heat exchange pipeline, and record the first duration when the pressure value is lower than the first pressure threshold;

[0026] Obtain the flow rate value of the coolant, and record the second duration when the flow rate value is lower than the first flow rate threshold;

[0027] Obtain the first duration and the second duration. When the first duration is not less than the first preset duration and the second duration is not less than the second preset duration, control the steam control valve to close and control the air inlet control valve to open.

[0028] According to the control method of the steam heat exchanger purging system of the present application, through this control method based on the judgment of pressure value, flow rate value and duration, the working state of the steam heat exchanger can be accurately grasped, and the purging process can be automatically started at an appropriate time. It avoids the problems caused by purging too early or too late. For example, purging too early may cause steam waste and insufficient heat exchange, and purging too late may cause the remaining condensate and steam to affect the equipment performance or even cause damage. It realizes the intelligent and automatic control of the steam heat exchanger purging system, improves the equipment operation efficiency, ensures the stable operation and service life of the equipment, reduces manual intervention at the same time, and reduces the labor cost.

[0029] According to an embodiment of the present application, after controlling the steam control valve to close and controlling the air inlet control valve to open, the control method further includes:

[0030] When the flow rate value is not greater than the second flow rate threshold, control the steam trap group to close;

[0031] When the pressure value reaches the second pressure threshold, control the air inlet control valve to close and record the third duration;

[0032] Obtain the third duration. When the third duration is not less than the third preset duration, obtain the pressure value;

[0033] If the pressure value is less than the second pressure threshold, it is determined that the heat exchange pipeline leaks;

[0034] If the pressure value is not less than the second pressure threshold, it is determined that the heat exchange pipeline does not leak.

[0035] According to an embodiment of the present application, the steam heat exchanger purging system further includes a purging outlet pipeline, the purging outlet pipeline is connected to the condensate discharge pipeline, the condensate discharge pipeline extends in the horizontal direction, the purging outlet pipeline is vertically connected to the upper side of the condensate discharge pipeline, an outlet control valve is provided on the purging outlet pipeline, the outlet control valve is electrically connected to the controller, and if the pressure value is less than the second pressure threshold, after it is determined that the heat exchange pipeline leaks, the control method further includes:

[0036] Controlling the outlet control valve to open and recording the fourth duration;

[0037] Obtaining the fourth duration, when the fourth duration is not less than the fourth preset duration, controlling the outlet control valve to close and sending an alarm signal.

[0038] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0040] Figure 1 is a schematic structural diagram of the steam heat exchanger purging system provided by the embodiment of the present application;

[0041] Figure 2 is another schematic structural diagram of the steam heat exchanger purging system provided by the embodiment of the present application;

[0042] Figure 3 is a schematic flowchart of the control method of the steam heat exchanger purging system provided by the embodiment of the present application.

[0043] Reference Numerals:

[0044] 100, steam heat exchanger purging system; 110, steam heat exchanger; 111, steam pipeline; 1111, steam main control valve; 1112, steam control valve; 112, heat exchange pipeline; 130, gas supply device; 131, air compressor; 132, buffer tank; 140, purging inlet pipeline; 141, inlet control valve; 142, precision filter; 150, purging outlet pipeline; 151, outlet control valve; 152, gas-liquid separator; 160, condensate discharge pipeline; 161, steam trap group; 170, pressure gauge; 180, flowmeter. Detailed Embodiments

[0045] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0046] Reference will be made below Figures 1-3 to describe a steam heat exchanger purging system and its control method according to an embodiment of the present application.

[0047] Please refer to Figure 1 and Figure 2 , according to some embodiments of the present application, the steam heat exchanger 110 purging system includes a steam heat exchanger 110, a gas supply device 130, a purging inlet pipeline 140, a condensate discharge pipeline 160, a pressure gauge 170, and a controller.

[0048] A heat exchange pipeline 112 is provided inside the steam heat exchanger 110; the gas supply device 130 includes an air compressor 131 and a buffer tank 132, and the air compressor 131 is connected to the first air inlet of the buffer tank 132; the purging inlet pipeline 140 is connected between the air outlet of the buffer tank 132 and the steam inlet of the heat exchange pipeline 112, and an inlet control valve 141 is provided on the purging inlet pipeline 140; the condensate discharge pipeline 160 is connected to the condensate outlet of the heat exchange pipeline 112, and a steam trap group 161 is provided on the condensate discharge pipeline 160; the pressure gauge 170 is provided at the condensate outlet of the heat exchange pipeline 112; the controller is electrically connected to the air compressor 131, the inlet control valve 141, the pressure gauge 170, and the steam trap group 161.

[0049] The steam heat exchanger 110 is the core device in the whole system for realizing heat exchange between steam and other media (such as water or air). The internal heat exchange pipeline 112 is a channel for steam to flow and exchange heat with the external medium. The structure of the heat exchange pipeline 112 can adopt common forms such as serpentine pipes and straight pipe arrangements, and the material can be selected from corrosion-resistant metal materials such as stainless steel to ensure long-term stable use in a steam environment.

[0050] The air compressor 131 is used to generate compressed air and provide a power source for the purging system. The air compressor 131 can be selected from common types such as screw air compressors 131 and piston air compressors 131. Its working principle is to compress air through mechanical movement to increase the air pressure. The first air inlet of the buffer tank 132 is connected to the air compressor 131. Its function is to store the compressed air generated by the air compressor 131 and play a role in stabilizing the air pressure, avoiding adverse effects on the purging process caused by fluctuations in the compressed air pressure. The buffer tank 132 is usually a sealed metal tank body with a certain pressure resistance, and different volumes can be selected according to actual needs, such as 500L, 1000L, etc.

[0051] One end of the purging air inlet pipe 140 is connected to the air outlet of the buffer tank 132, and the other end is connected to the steam inlet of the heat exchange pipe 112. It provides a passage for compressed air to enter the heat exchange pipe 112 from the buffer tank 132. The material can be selected as the same or similar metal pipe as the steam pipe 111, such as seamless steel pipe. The air inlet control valve 141 is installed on this pipe to control the on-off and flow rate of the compressed air. The air inlet control valve 141 can adopt an electric ball valve, a pneumatic control valve, etc., and the opening and closing states of the valve are controlled by the electric signal sent by the controller.

[0052] The condensate discharge pipe 160 is connected to the condensate outlet of the heat exchange pipe 112 and is used to discharge the condensate generated during the heat exchange of the steam. The main function of the steam trap group 161 on the pipe is to automatically discharge the condensate and prevent steam leakage at the same time. The steam trap group 161 can be composed of multiple different types of steam trap groups 161, such as thermodynamic steam traps, float steam traps, etc., to meet the drainage requirements under different working conditions.

[0053] The pressure gauge 170 is installed at the condensate outlet of the heat exchange pipe 112. On the one hand, the pressure gauge 170 can accurately detect the pressure condition when the condensate is discharged. During normal operation, the pressure data can be used to judge whether the condensate is discharged smoothly and whether the working state of the steam trap group 161 is good. For example, if the condensate discharge pressure is too high, it may mean that the steam trap group 161 is blocked, resulting in the accumulation of condensate and affecting the heat exchange efficiency of the steam heat exchanger 110.

[0054] On the other hand, during the purging process, since the purging air inlet pipe 140 and the condensate discharge pipe 160 are connected through the heat exchange pipe 112, the pressure detected by the pressure gauge 170 at this time is the pressure of the compressed air in the entire pipeline system. This enables the operator to directly understand the pressure during purging. The controller can also adjust the opening of the air inlet control valve 141 according to this pressure signal to maintain the purging pressure within a suitable range, ensuring the purging effect and avoiding damage to the pipeline due to excessive pressure.

[0055] During the pressure holding process, due to the connectivity of the pipeline, the pressure gauge 170 continuously monitors the air pressure in the system. If the pressure drops abnormally, it can be judged that there is a leakage point in the system, and corresponding maintenance measures can be taken to ensure the tightness and stable operation of the system.

[0056] The controller, as the control core of the entire system, is electrically connected to the air compressor 131, the intake control valve 141, the pressure gauge 170, and the drain valve group 161 through wires. The controller receives the pressure signal transmitted by the pressure gauge 170 and controls the start and stop of the air compressor 131, the opening degree of the intake control valve 141, and the working state of the drain valve group 161 according to the preset program and logic. For example, when the system needs to be purged, the controller controls the air compressor 131 to start, opens the intake control valve 141, and allows compressed air to enter the heat exchange pipeline 112; when abnormal pressure is detected, the controller can adjust the opening degree of the intake control valve 141 or issue an alarm, etc.

[0057] In actual implementation, when the steam heat exchanger 110 needs to be purged during shutdown, the controller controls the air compressor 131 to start. After the generated compressed air enters the buffer tank 132 for pressure stabilization, it passes through the purge inlet pipeline 140 and enters the heat exchange pipeline 112 under the condition that the controller controls the intake control valve 141 to open. The compressed air purges the residual condensed water in the heat exchange pipeline 112 along the condensed water discharge pipeline 160. During this process, the drain valve group 161 automatically discharges the condensed water. At the same time, the pressure gauge 170 monitors the condensed water outlet pressure in real time and feeds it back to the controller. After the purge is completed, the air supply device 130 can be used to continue pressurizing, and by observing the data of the pressure gauge 170, the controller can determine whether there are problems such as leaks in the system.

[0058] According to the steam heat exchanger 110 purge system provided by the embodiments of the present application, by setting the air supply device 130 and the purge inlet pipeline 140, when the steam heat exchanger 110 is shut down, compressed air can be introduced through the air supply device 130 and the purge inlet pipeline 140 for automatic purging, purging the residual condensed water in the heat exchange pipeline 112, reducing the water hammer phenomenon, and protecting the steam heat exchanger 110. After purging, the air supply device 130 can also be used to automatically pressurize, and cooperate with the pressure gauge 170 and the intake control valve 141 to achieve automatic leak detection, simplify the maintenance process, and ensure the stable use of the system.

[0059] Please refer to Figure 1 , in some embodiments, a compressed air control valve may be provided between the air compressor 131 and the buffer tank 132. The compressed air control valve can be electrically connected to the controller, and the pressure of the buffer tank 132 can be dynamically adjusted by the controller through the opening degrees of the air compressor 131 and the compressed air control valve to ensure the stability of the compressed air output and meet the compressed air requirements during purging.

[0060] In some embodiments, a drain valve may be provided at the bottom of the buffer tank 132, and a safety valve may be provided at the top of the buffer tank 132. The bottom drain valve can regularly discharge the accumulated water at the bottom of the buffer tank 132 to ensure the dryness and cleanliness of the compressed air. When the buffer tank 132 is overpressured, the safety valve automatically opens for pressure relief to ensure safety.

[0061] Please refer to Figure 1 and Figure 2 The purge outlet pipeline 150 may also be included in the steam heat exchanger 110 purge system. The purge outlet pipeline 150 is connected to the condensate discharge pipeline 160. The condensate discharge pipeline 160 extends in the horizontal direction. The purge outlet pipeline 150 is vertically connected to the upper side of the condensate discharge pipeline 160. An outlet control valve 151 is provided on the purge outlet pipeline 150, and the outlet control valve 151 is electrically connected to the controller.

[0062] The purge outlet pipeline 150 can be used to discharge the compressed air purged from the heat exchange pipeline 112 during the purge process of the steam heat exchanger 110. It is connected to the condensate discharge pipeline 160 to provide a discharge channel for the compressed air. Considering its use environment, the pipeline material can be selected as corrosion-resistant metal materials, such as stainless steel pipes.

[0063] The condensate discharge pipeline 160 extends in the horizontal direction, which is beneficial to the stable flow of condensate under the action of gravity and reduces the phenomenon of water accumulation. The purge outlet pipeline 150 is vertically connected to the upper side of the condensate discharge pipeline 160, which can effectively reduce the backflow of condensate into the purge outlet pipeline 150. The connection point of the condensate drainage pipeline and the purge outlet pipeline 150 can be selected to be near the condensate outlet, so as to timely lead out the compressed air blown from the heat exchange pipeline 112. During actual installation, the connection tightness between the two can be ensured by means such as welding and flange connection. For example, for pipelines with a smaller diameter, welding can be used to make the connection firm and well-sealed; for pipelines with a larger diameter, flange connection is convenient for later maintenance and repair.

[0064] The outlet control valve 151 is installed on the purge outlet pipeline 150 and can control the on-off of the compressed air in this pipeline. The outlet control valve 151 can be an electric butterfly valve, a pneumatic globe valve, etc. It receives the electrical signal sent by the controller and quickly and accurately executes the opening or closing action. The outlet control valve 151 is electrically connected to the controller. During the system purge stage, the controller can open the outlet control valve 151 according to the preset program to allow the compressed air to be discharged smoothly; during the non-purge stage, the controller closes the valve to prevent accidental gas leakage or abnormal flow.

[0065] In actual implementation, when the steam heat exchanger 110 enters the purging stage, the controller controls the air compressor 131 to generate compressed air, which enters the heat exchange pipeline 112 through the purging inlet pipeline 140 to blow out the residual condensed water. The condensed water flows by gravity through the horizontally extending condensed water discharge pipeline 160 to the collection device. At the same time, the discharged compressed air, after the controller opens the air outlet control valve 151, is discharged through the purging air outlet pipeline 150 vertically connected to the upper side of the condensed water discharge pipeline 160. The discharged compressed air can be discharged into other dedicated gas recovery devices for recycling according to actual needs. If recycling is not required, it can also be directly discharged into the atmosphere. In other stages such as pressure holding, the controller closes the air outlet control valve 151 to prevent the disorderly flow of compressed air in the purging air outlet pipeline 150 and maintain the normal pressure state and operation order of the system.

[0066] Please refer to Figure 1 and Figure 2 , according to some embodiments of the present application, the purging air outlet pipeline 150 can be connected to the second air inlet of the buffer tank 132, and a gas-liquid separator 152 can be provided on the purging air outlet pipeline 150.

[0067] The purging air outlet pipeline 150 is connected to the second air inlet of the buffer tank 132, so that the compressed air purged from the heat exchange pipeline 112 can enter the buffer tank 132 for storage or recycling after passing through the purging air outlet pipeline 150.

[0068] Since the compressed air blown out from the heat exchange pipeline 112 may carry a small amount of condensed water, if it directly enters the buffer tank 132, it may corrode the internal structure of the buffer tank 132, affect its service life, and may also affect the subsequent use effect of the compressed air. The gas-liquid separator 152 is installed on the purging air outlet pipeline 150 to separate the condensed water in the purging air outlet pipeline 150. The gas-liquid separator 152 can be a common centrifugal gas-liquid separator 152 or a filter element type gas-liquid separator 152. The gas-liquid separator 152 usually has a drain port, and the separated water can be regularly discharged through the drain port. A manual valve or an automatic drain valve can be installed at the drain port to control the drainage operation according to actual conditions.

[0069] One end of the purging outlet pipeline 150 is connected to the condensate discharge pipeline 160, and the other end is connected to the second air inlet of the buffer tank 132. The gas-liquid separator 152 is connected in series in the middle of the purging outlet pipeline 150. During system operation, the compressed air blown out from the heat exchange pipeline 112 first passes through the gas-liquid separator 152 for gas-liquid separation, and the compressed air after removing moisture then enters the buffer tank 132. The outlet control valve 151 is also installed on the purging outlet pipeline 150, and its position can be set before or after the gas-liquid separator 152 according to actual requirements. The controller still controls the on-off state of the outlet control valve 151 through an electrical signal to ensure the normal operation of the entire purging outlet pipeline 150 system.

[0070] Please refer to Figure 1 , according to some embodiments of the present application, two precision filters 142 can be provided on the purging inlet pipeline 140. The two precision filters 142 are arranged in parallel and are electrically connected to the controller.

[0071] The precision filter 142 provided on the purging inlet pipeline 140 can finely filter the compressed air entering the heat exchange pipeline 112 to remove possible impurity particles therein, such as dust, rust, etc. This can effectively protect the heat exchange pipeline 112 inside the steam heat exchanger 110 and other components in contact with the compressed air, preventing impurities from causing wear or blockage. The precision filter 142 can adopt a common folded filter element structure, and the filter element material is selected as a high-precision filtering material, such as fiberglass, etc., to ensure the efficient interception of tiny impurities.

[0072] Two precision filters 142 are provided and connected in parallel on the purging inlet pipeline 140. When one precision filter 142 is working normally, the other is used as a backup. This one-for-one backup design greatly improves the reliability and stability of the system. Both precision filters 142 are electrically connected to the controller. The controller can monitor the working status of the two precision filters 142 in real time. For example, by monitoring the pressure difference before and after the filter through a pressure sensor, it can be judged whether the filter has abnormal conditions such as blockage. When the working precision filter 142 fails, such as the pressure difference exceeds the preset threshold, indicating that its filter element may have been blocked by impurities, at this time the controller can automatically switch to the backup precision filter 142 to work, and at the same time issue an alarm to notify the maintenance personnel to repair the faulty filter or replace the filter element.

[0073] Please refer to Figure 1 and Figure 2 , according to some embodiments of the present application, a flow meter 180 can be provided on the condensate drain pipeline, and the flow meter 180 can be electrically connected to the controller.

[0074] A flowmeter 180 is installed on the condensate discharge pipeline 160, which can monitor the flow data of condensate in real time. The flowmeter 180 can be an electromagnetic flowmeter 180, a vortex flowmeter 180, an ultrasonic flowmeter 180, etc. The flowmeter 180 is installed in series on the condensate discharge pipeline 160, and its upstream and downstream are connected to the condensate discharge pipeline 160 through a suitable connection method.

[0075] During the normal operation of the steam heat exchanger 110, the flowmeter 180 continuously monitors the condensate flow. According to the preset normal flow range, the controller can judge whether the working state of the steam heat exchanger 110 is normal by analyzing the flow data. For example, if the condensate flow is significantly lower than the normal range, it may mean that the internal heat exchange efficiency of the steam heat exchanger 110 has decreased, and there are problems such as blockage of the heat exchange pipeline 112; if the flow increases abnormally, it may indicate that there is a leakage in the steam heat exchanger 110. During the purging stage, the flowmeter 180 also plays an important role. When purging starts, the condensate flow will change as the compressed air purges the residual condensate in the heat exchange pipeline 112. By monitoring the data of the flowmeter 180, the controller can judge whether the purging is carried out effectively. If the flow remains stable and close to zero for a period of time, it can be preliminarily judged that the purging has basically purged the residual condensate in the heat exchange pipeline 112, and then it is determined that the purging is completed.

[0076] Please refer to Figure 2 , according to some embodiments of the present application, the heat exchange pipeline 112 can be in a circuitous and bent shape, and a detachable maintenance panel is provided at a position corresponding to the bent portion of the heat exchange pipeline 112 on the outer shell of the steam heat exchanger 110.

[0077] The heat exchange pipeline 112 can adopt a circuitous and bent design. Such a structure greatly increases the length and surface area of the heat exchange pipeline 112 inside the steam heat exchanger 110, thereby improving the heat exchange efficiency between the steam and the external medium (such as water or air). The bent shape can be in various forms such as U-shaped, S-shaped, etc., and the specific design depends on the spatial layout and heat exchange requirements of the steam heat exchanger 110.

[0078] The maintenance panel is installed at a position corresponding to the bent portion of the heat exchange pipeline 112 on the outer shell of the steam heat exchanger 110, which facilitates direct access to the bent portion of the heat exchange pipeline 112 during equipment maintenance and repair. The connection method between the maintenance panel and the outer shell of the steam heat exchanger 110 adopts a detachable design, and common ones include bolt connection and snap connection.

[0079] When maintenance or repair of the steam heat exchanger 110 is required, especially for problems such as blockage and leakage that may occur at the bent parts of the heat exchange pipelines 112, maintenance personnel can directly access the bent parts of the heat exchange pipelines 112 by removing the inspection panels at the corresponding positions to carry out inspection, cleaning or repair work. For example, if impurities are found to block a certain bent part, it can be dredged through the opening of the inspection panel using special tools; if a leakage point is found, the part can be welded and repaired or the damaged components can be replaced.

[0080] Please refer to Figure 1 , according to some embodiments of the present application, the steam heat exchanger 110 may include a plurality of heat exchange pipelines 112; the purge inlet pipeline 140 includes an inlet main pipe connected to the air outlet of the buffer tank 132, and a plurality of inlet branch pipes connected between the inlet main pipe and each heat exchange pipeline 112, and an inlet control valve 141 is provided on the inlet branch pipes; the purge outlet pipeline 150 includes an outlet main pipe connected to the second air inlet of the buffer tank 132, and a plurality of outlet branch pipes connected between the outlet main pipe and each heat exchange pipeline 112, and an outlet control valve 151 is provided on the outlet branch pipes; the condensate discharge pipeline 160 includes a condensate discharge main pipe, and a plurality of condensate discharge branch pipes connected between the condensate discharge main pipe and the condensate outlets of each heat exchange pipeline 112, and a steam trap group 161 is provided on the condensate discharge branch pipes.

[0081] A plurality of heat exchange pipelines 112 are arranged inside the steam heat exchanger 110 to increase the overall heat exchange area and improve the heat exchange efficiency. The number of the heat exchange pipelines 112 can be determined according to the specifications of the steam heat exchanger 110 and the actual heat exchange requirements. For example, a small steam heat exchanger 110 may be provided with 3 - 5 heat exchange pipelines 112, a medium-sized one has 6 - 10, and a large-sized one can have more than 15. These heat exchange pipelines 112 can be arranged inside the steam heat exchanger 110 in a parallel arrangement or a layered arrangement. In one example, there are 8 heat exchange pipelines 112, and it should be noted that only two heat exchange pipelines 112 are shown in the figure.

[0082] One end of the intake main pipe is connected to the air outlet of the buffer tank 132, serving as the total passage for compressed air to enter each heat exchange pipeline 112. A plurality of intake branch pipes are connected between the intake main pipe and each heat exchange pipeline 112 to distribute the compressed air in the intake main pipe to each heat exchange pipeline 112. The number of intake branch pipes is the same as the number of heat exchange pipelines 112, and each intake branch pipe is correspondingly connected to one heat exchange pipeline 112. The diameter of the branch pipe is relatively smaller than that of the intake main pipe, and the specific size is determined according to the compressed air flow required by a single heat exchange pipeline 112. An intake control valve 141 is installed on each intake branch pipe, and types such as an electric ball valve and a pneumatic regulating valve can be selected, and the opening, closing and opening degree of the valve are controlled by the electric signal sent by the controller, so as to accurately control the compressed air flow entering each heat exchange pipeline 112. Among them, a precision filter 142 is arranged on the intake main pipe.

[0083] One end of the exhaust main pipe is connected to the second air inlet of the buffer tank 132, and is used to collect the compressed air purged from each heat exchange pipeline 112. A plurality of exhaust branch pipes are connected between the exhaust main pipe and each heat exchange pipeline 112 to introduce the compressed air purged from each heat exchange pipeline 112 into the exhaust main pipe. The number of exhaust branch pipes matches the number of heat exchange pipelines 112, and each exhaust branch pipe corresponds to one heat exchange pipeline 112. An exhaust control valve 151 is installed on each exhaust branch pipe, which is controlled by the electric signal of the controller and is used to adjust the discharge of the compressed air purged from each heat exchange pipeline 112. Among them, a gas-liquid separator 152 is arranged on the exhaust main pipe.

[0084] The condensate discharge main pipe serves as the total passage for collecting the condensate of each heat exchange pipeline 112, and finally transports the condensate to the collection device. A plurality of condensate discharge branch pipes are connected between the condensate discharge main pipe and the condensate outlet of each heat exchange pipeline 112 to introduce the condensate generated by a single heat exchange pipeline 112 into the condensate discharge main pipe. A steam trap group 161 is provided on each condensate discharge branch pipe, and the steam trap group 161 can be composed of a thermodynamic steam trap, a float steam trap, etc., which can automatically discharge the condensate and prevent steam leakage at the same time.

[0085] When the steam heat exchanger 110 needs to be purged, the controller starts the air compressor 131. After the compressed air is stabilized by the buffer tank 132, it enters the intake main pipe. Subsequently, according to the preset program, the controller distributes the compressed air to each heat exchange pipeline 112 by controlling the intake control valves 141 on each intake branch pipe to purge the residual condensate in the heat exchange pipeline 112. The blown-out condensate enters the condensate discharge main pipe through the steam trap groups 161 on each condensate discharge branch pipe and finally flows to the collection device. At the same time, the purged compressed air enters the exhaust main pipe through the exhaust control valves 151 on each exhaust branch pipe. If the system is designed to recover the compressed air, it enters the second intake port of the buffer tank 132; if not, it can be discharged to other devices or the atmosphere according to the setting. During the whole process, the control valves of each pipeline are uniformly coordinated and controlled by the controller to ensure the orderly and efficient progress of the purging operation.

[0086] The design of multiple condensate discharge branch pipes, multiple intake branch pipes and multiple exhaust branch pipes can separately maintain the pressure of each heat exchange pipeline 112 during pressure holding, making the leak detection more accurate and improving the maintenance efficiency. And it can also achieve separate purging, separate pressure holding detection, etc.

[0087] It can be understood that a steam pipeline 111 connected to the intake port of the heat exchange pipeline 112 can be provided in the steam heat exchanger 110. A steam control valve 1112 is provided on the steam pipeline 111, and the steam control valve 1112 is electrically connected to the controller. The steam flow rate into the heat exchange pipeline 112 is controlled by the steam control valve 1112.

[0088] Furthermore, when there are multiple heat exchange pipelines 112, the steam pipeline 111 can include a steam main pipe and multiple steam branch pipes. The steam main pipe is connected to the intake ports of the multiple heat exchange pipelines 112 in one-to-one correspondence through the multiple steam branch pipes. A steam main control valve 1111 can be provided on the steam main pipe, and a steam control valve 1112 can be provided on the steam branch pipe. The total steam flow rate input into the steam heat exchanger 110 is controlled by the steam main control valve 1111, and the on / off and steam flow rate of each heat exchange pipeline 112 can be respectively controlled by the steam control valve 1112, which is convenient for dynamically adjusting the working states of different heat exchange pipelines 112 and also facilitates the operations of separate purging and pressure holding, that is, each heat exchange pipeline 112 can be purged and pressure held simultaneously, or can be out of sync, for example, some heat exchange pipelines 112 are working normally, some heat exchange pipelines 112 are being purged, and some heat exchange pipelines 112 are being pressure held and detected, etc.

[0089] Please refer to Figure 3, The embodiment of the present application also provides a control method for a steam heat exchanger 110 purging system based on any of the above technical solutions. A steam pipeline 111 connected to the air inlet of the heat exchange pipeline 112 is provided in the steam heat exchanger 110. A steam control valve 1112 is provided on the steam pipeline 111, and the steam control valve 1112 is electrically connected to the controller.

[0090] It should be noted that the control method for the steam heat exchanger 110 purging system provided by the embodiment of the present application includes the technical features and beneficial effects of the steam heat exchanger 110 purging system in any of the above technical solutions, which will not be elaborated here.

[0091] The control method includes: Step 210, Step 220, and Step 230.

[0092] Step 210: Obtain the pressure value of the heat exchange pipeline 112, and record the first duration when the pressure value is lower than the first pressure threshold.

[0093] In Step 210, the pressure gauge 170 can convert the measured pressure signal into an electrical signal and transmit it to the controller. The first pressure threshold can be preset according to the pressure range during the normal operation of the steam heat exchanger 110 and the pressure condition for purging startup. Exemplarily, when the steam heat exchanger 110 is operating normally, the pressure in the heat exchange pipeline 112 usually maintains at 0.5 - 0.8 MPa. The first pressure threshold can be set to 0.3 MPa, 0.4 MPa, or 0.5 MPa, etc., which can be changed according to the actual situation. When the pressure value received by the controller is lower than the first pressure threshold, the internal timing function is started to record the first duration, and the first duration reflects the duration for which the pressure in the heat exchange pipeline 112 is lower than the set threshold.

[0094] The flowmeter 180 transmits the flow data to the controller in the form of an electrical signal. The first flow threshold is also preset according to the flow range of the condensate water during the normal operation of the steam heat exchanger 110 and the flow condition for purging startup. Assuming that during normal operation, the condensate water flow is generally 2 cubic meters per hour - 4 cubic meters per hour, the first flow threshold can be set to 1 cubic meter per hour, 0.8 cubic meter per hour, 0.6 cubic meter per hour, etc., which can be changed according to the actual situation. When the flow value received by the controller is lower than the first flow threshold, another timing function is started to record the second duration, and the second duration reflects the duration for which the condensate water flow is lower than the set threshold.

[0095] Step 220: Obtain the flow value of the coolant, and record the second duration when the flow value is lower than the first flow threshold;

[0096] Step 230: Obtain a first duration and a second duration. When the first duration is not less than a first preset duration and the second duration is not less than a second preset duration, control the steam control valve 1112 to close and control the intake control valve 141 to open.

[0097] In step 230, the first preset duration and the second preset duration are key time parameters set according to actual production experience and the performance characteristics of the steam heat exchanger 110. Exemplarily, the first preset duration can be set to 10 minutes and the second preset duration can be set to 10 minutes. When the first duration obtained by the controller is not less than the first preset duration and the second duration is not less than the second preset duration, it indicates that the pressure and condensate flow rate in the heat exchange pipeline 112 are at a relatively low level for a long time. At this time, the steam heat exchanger 110 may have completed the heat exchange task, and the remaining steam and condensate inside need to be cleaned. Thus, the controller sends an electrical signal to control the steam control valve 1112 to close, stopping the steam from entering the heat exchange pipeline 112; at the same time, control the intake control valve 141 to open, so that compressed air can enter the heat exchange pipeline 112 through the purge intake pipeline 140 to start the purge operation on the heat exchange pipeline 112.

[0098] Specifically, when the controller controls the steam control valve 1112 to close, it can first control the main steam control valve 1111 to close slightly. For example, reduce the opening of the main steam control valve 1111 from 100% to 80%, reduce the amount of steam entering the steam heat exchanger 110, and then control the steam control valve 1112 to close.

[0099] According to the control method of the purge system of the steam heat exchanger 110 provided by the embodiments of the present application, through this control method based on the judgment of pressure values, flow values, and durations, the working state of the steam heat exchanger 110 can be accurately grasped, and the purge process can be automatically started at an appropriate time. It avoids problems caused by premature or late purge operations. For example, premature purge may lead to steam waste and insufficient heat exchange, while late purge may cause the remaining condensate and steam to affect the equipment performance or even cause damage. It realizes the intelligent and automatic control of the purge system of the steam heat exchanger 110, improves the equipment operation efficiency, ensures the stable operation and service life of the equipment, reduces manual intervention at the same time, and lowers the labor cost.

[0100] According to some embodiments of the present application, after step 230: controlling the steam control valve 1112 to close and controlling the intake control valve 141 to open, the control method further includes: step 240, step 250, step 260, step 270, and step 280.

[0101] Step 240: When the flow value is not greater than a second flow threshold, control the drain valve group 161 to close.

[0102] In step 240, the second flow threshold is preset according to the change of the condensate flow rate during the purging process. Exemplarily, the second flow threshold can be set to 0.1 cubic meters per hour, 0.05 cubic meters per hour, or set to 0. When the flow value transmitted by the flowmeter 180 to the controller is not greater than the second flow threshold, it means that the condensate in the heat exchange pipeline 112 has been basically purged. At this time, the controller sends an electrical signal to control the closing of the steam trap group 161 to prevent compressed air from leaking from the condensate discharge pipeline 160, ensure the stability of the system pressure, and maintain the purging effect.

[0103] Step 250: When the pressure value reaches the second pressure threshold, control the intake control valve 141 to close and record the third duration.

[0104] In step 250, the second pressure threshold is set according to the normal pressure range of the system during the compressed air purging, such as 0.6 MPa, 0.7 MPa, or 0.8 MPa, etc. When the pressure value detected by the pressure sensor reaches the second pressure threshold, it indicates that the compressed air has filled the heat exchange pipeline 112 and reached a certain pressure. At this time, the controller controls the intake control valve 141 to close, stops the compressed air from continuing to enter, and starts the timing function to record the third duration. This third duration is used to judge the pressure holding situation of the heat exchange pipeline 112 subsequently.

[0105] Step 260: Obtain the third duration. When the third duration is not less than the third preset duration, obtain the pressure value.

[0106] In step 260, the third preset duration is set according to the equipment pressure resistance test experience and actual operation requirements, assumed to be 30 minutes. When the third duration is not less than the third preset duration, the controller obtains the pressure value transmitted by the pressure sensor again for subsequent leakage judgment.

[0107] Step 270: If the pressure value is less than the second pressure threshold, it is determined that the heat exchange pipeline 112 leaks.

[0108] Step 280: If the pressure value is not less than the second pressure threshold, it is determined that the heat exchange pipeline 112 does not leak.

[0109] In steps 270 and 280, if the obtained pressure value is less than the second pressure threshold at this time, it indicates that the system pressure drops significantly within a certain period of time. Most likely, there is a leakage point in the heat exchange pipeline 112, resulting in the leakage of compressed air. Therefore, it is determined that the heat exchange pipeline 112 leaks; if the pressure value is not less than the second pressure threshold, it indicates that the system pressure remains stable during this period, and there is no obvious leakage in the heat exchange pipeline 112. It is determined that the heat exchange pipeline 112 does not leak.

[0110] According to the control method provided by the embodiments of the present application, not only can the steam trap group 161 be reasonably controlled during the purging process to ensure the purging effect, but also the leakage detection of the heat exchange pipeline 112 can be carried out by using pressure monitoring. This comprehensive control method further improves the intelligent and automated level of the purging system of the steam heat exchanger 110. It can timely detect potential leakage problems of the heat exchange pipeline 112, avoid equipment damage and production accidents caused by leakage, ensure the stable operation of the equipment, reduce the workload of manual inspection, lower the production cost, and improve the production efficiency.

[0111] According to some embodiments of the present application, the purging system of the steam heat exchanger 110 further includes a purging outlet pipeline 150. The purging outlet pipeline 150 is connected to the condensate discharge pipeline 160. The condensate discharge pipeline 160 extends in the horizontal direction. The purging outlet pipeline 150 is vertically connected to the upper side of the condensate discharge pipeline 160. An outlet control valve 151 is provided on the purging outlet pipeline 150. The outlet control valve 151 is electrically connected to the controller. After step 270, if the pressure value is less than the second pressure threshold and it is determined that the heat exchange pipeline 112 leaks, the control method further includes: step 271 and step 272.

[0112] Step 271: Control the outlet control valve 151 to open and record the fourth duration.

[0113] In step 271, after it is determined in step 270 that the heat exchange pipeline 112 leaks, that is, when the pressure value is less than the second pressure threshold, the controller immediately sends an electrical signal to control the outlet control valve 151 to open. At the same time, the internal timing function is started to record the fourth duration. The fourth duration is used to measure the time process of the subsequent operations of the system after the outlet control valve 151 is opened. The fourth preset duration is set according to the requirements for the leakage response time in actual production and the time estimation for the system pressure balance restoration, such as set to 1 minute or 2 minutes, etc.

[0114] Step 272: Obtain the fourth duration. When the fourth duration is not less than the fourth preset duration, control the outlet control valve 151 to close and send an alarm signal.

[0115] In step 77, when the fourth duration reaches or exceeds the fourth preset duration, it indicates that the system has enough time to release the high-pressure air maintained in the heat exchange pipeline 112 through the air outlet control valve 151. At this time, the controller controls the air outlet control valve 151 to close to prevent outside air from flowing back into the heat exchange pipeline 112 that may have potential leakage hazards. Meanwhile, the controller sends an alarm signal, which can be in the form of audible and visual alarms, to remind the operator that the heat exchange pipeline 112 is in a state where it can be safely repaired. The alarm device can be an audible and visual alarm connected to the controller by wire, or it can be connected to a remote alarm device through a wireless communication module to ensure that the operator can timely know the device status no matter where they are, and then repair the leaking heat exchange pipeline 112.

[0116] According to the control method provided by the embodiments of the present application, the processing flow after equipment failure is optimized. By controlling the air outlet control valve 151 to open for a period of time, the high-pressure air in the heat exchange pipeline 112 can be effectively released, creating conditions for subsequent safe repair. Closing the valve in time and sending an alarm signal after the specified time is reached can accurately prompt the operator to perform repairs, reduce the risk of further damage to the equipment caused by misoperation or untimely repair, improve the equipment repair efficiency, ensure the stable operation of the steam heat exchanger 110 purging system, and reduce the potential losses caused by equipment failures.

[0117] It should be noted that the purging system of the steam heat exchanger 110 in the present application can also perform operations such as purging and pressure holding through active control by the controller, and it is not limited to purging and pressure holding only when the steam heat exchanger 110 stops. For example, purging can be performed before the steam heat exchanger 110 starts up. Exemplarily, when the controller receives a purging operation signal, it controls the purging system to work.

[0118] Furthermore, in some embodiments, when the steam heat exchanger 110 includes multiple heat exchange pipelines 112, the controller can purge each of the multiple heat exchange pipelines 112 one by one, and the valve action conditions are as described in the above control method; after the purging of the multiple heat exchange pipelines 112 is completed, the purging program automatically closes. When the controller receives a pressure holding operation signal, it can also perform pressure testing on each of the multiple heat exchange pipelines 112 one by one.

[0119] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0120] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0121] In the description of this application, the "first feature" and "second feature" may include one or more of such features.

[0122] In the description of this application, the meaning of "a plurality" is two or more.

[0123] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0124] In the description of this application, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal level than the second feature.

[0125] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0126] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A steam heat exchanger purging system, characterized in that, Comprising: A steam heat exchanger, in which a heat exchange pipeline is provided; A gas supply device, including an air compressor and a buffer tank, the air compressor is connected to the first air inlet of the buffer tank; A purging inlet pipeline, connected between the air outlet of the buffer tank and the steam inlet of the heat exchange pipeline, and an inlet control valve is provided on the purging inlet pipeline; A condensate discharge pipeline, connected to the condensate outlet of the heat exchange pipeline, and a steam trap group is provided on the condensate discharge pipeline; A pressure gauge, the pressure gauge is provided at the condensate outlet of the heat exchange pipeline; A controller, the controller is electrically connected to the air compressor, the inlet control valve, the pressure gauge and the steam trap group.

2. The steam heat exchanger purging system according to claim 1, wherein, It further includes a purging outlet pipeline, the purging outlet pipeline is connected to the condensate discharge pipeline, the condensate discharge pipeline extends in the horizontal direction, the purging outlet pipeline is vertically connected to the upper side of the condensate discharge pipeline, and an outlet control valve is provided on the purging outlet pipeline, and the outlet control valve is electrically connected to the controller.

3. The steam heat exchanger purging system according to claim 2, wherein The purging outlet pipeline is connected to the second air inlet of the buffer tank, and a gas-water separator is provided on the purging outlet pipeline.

4. The steam heat exchanger purging system according to claim 1, wherein, Two precision filters are provided on the purging inlet pipeline, the two precision filters are arranged in parallel, and the precision filters are electrically connected to the controller.

5. The steam heat exchanger purging system according to claim 1, wherein A flow meter is provided on the condensate discharge pipeline, and the flow meter is electrically connected to the controller.

6. The steam heat exchanger purging system according to any one of claims 1-5, characterized in that, The heat exchange pipeline is in a circuitous and bent shape, and a detachable maintenance panel is provided at a position corresponding to the bent part of the heat exchange pipeline on the outer shell of the steam heat exchanger.

7. The steam heat exchanger purging system according to any one of claims 1-5, characterized in that, The steam heat exchanger includes a plurality of the heat exchange pipelines; The purging inlet pipeline includes an inlet main pipeline connected to the air outlet of the buffer tank, and a plurality of inlet branch pipelines connected between the inlet main pipeline and each heat exchange pipeline, and the inlet control valve is provided on the inlet branch pipeline; The purging outlet pipeline includes an outlet main pipeline connected to the second air inlet of the buffer tank, and a plurality of outlet branch pipelines connected between the outlet main pipeline and each heat exchange pipeline, and the outlet control valve is provided on the outlet branch pipeline; The condensate discharge pipeline includes a condensate discharge main pipeline, and a plurality of condensate discharge branch pipelines connected between the condensate discharge main pipeline and the condensate outlets of each heat exchange pipeline, and the steam trap group is provided on the condensate discharge branch pipeline.

8. A control method for a steam heat exchanger purging system according to any one of claims 1-7, characterized in that, A steam pipeline connected to the air inlet of the heat exchange pipeline is provided in the steam heat exchanger, a steam control valve is provided on the steam pipeline, the steam control valve is electrically connected to the controller, and the control method includes: Obtaining the pressure value of the heat exchange pipeline, and recording the first duration when the pressure value is lower than the first pressure threshold; Obtaining the flow value of the coolant, and recording the second duration when the flow value is lower than the first flow threshold; Obtaining the first duration and the second duration, and when the first duration is not less than the first preset duration and the second duration is not less than the second preset duration, controlling the steam control valve to close and controlling the inlet control valve to open.

9. The control method of the steam heat exchanger purging system according to claim 8, characterized in that, After controlling the steam control valve to close and controlling the inlet control valve to open, the control method further includes: When the flow value is not greater than the second flow threshold, control the steam trap group to close; When the pressure value reaches the second pressure threshold, control the intake control valve to close and record the third duration; Obtain the third duration, and when the third duration is not less than the third preset duration, obtain the pressure value; If the pressure value is less than the second pressure threshold, determine that the heat exchange pipeline leaks; If the pressure value is not less than the second pressure threshold, determine that the heat exchange pipeline does not leak.

10. The control method of the steam heat exchanger purging system according to claim 9, characterized in that, The steam heat exchanger purging system further includes a purging outlet pipeline, which is connected to the condensate discharge pipeline. The condensate discharge pipeline extends horizontally, and the purging outlet pipeline is vertically connected to the upper side of the condensate discharge pipeline. An outlet control valve is provided on the purging outlet pipeline, and the outlet control valve is electrically connected to the controller. After determining that the heat exchange pipeline leaks if the pressure value is less than the second pressure threshold, the control method further includes: Control the outlet control valve to open and record the fourth duration; Obtain the fourth duration, and when the fourth duration is not less than the fourth preset duration, control the outlet control valve to close and send an alarm signal.

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