Heat network heater air-water separation device

Abstract

The present application relates to the separation technical field, specifically disclose a kind of heat network heater gas-water separation device.The heat network heater gas-water separation device includes heat network heater body, gas extraction branch pipe, gas extraction main pipe, gas-water separation tank, vacuum unit and reflux pipe;Gas extraction branch pipe is located in the gas phase space above the liquid level of heat network heater body;Gas extraction branch pipe's gas outlet end is communicated with the gas inlet end of gas extraction main pipe;Gas extraction main pipe's gas outlet end is communicated with the gas inlet of gas-water separation tank;Gas-water separation tank's top is provided with exhaust port, and gas-water separation tank's exhaust port is communicated with the gas inlet end of vacuum unit;Gas-water separation tank's bottom is provided with drain, and gas-water separation tank's drain is communicated with heat network heater body by reflux pipe.The heat network heater gas-water separation device of the present application embodiment can realize the gas-water separation of heater, and liquid recovery.

Description

Technical Field

[0001] This invention belongs to the field of separation technology, specifically relating to a gas-water separation device for a heating network heater. Background Technology

[0002] Heat exchange network heaters are key equipment in thermal systems used to heat circulating water in the heat exchange network. During operation, the heating steam inevitably contains non-condensable gases such as air. In related technologies, heat exchange network heaters typically lack dedicated gas venting and gas-water separation and recovery devices, leading to the continuous accumulation of non-condensable gases within the heater shell, forming a gas film on the surface of the heat exchange tube bundle. Since the thermal conductivity of gases is much lower than that of metals and condensate, the presence of this gas film significantly increases heat exchange resistance, resulting in decreased heat exchange efficiency and poorer heating performance. Simultaneously, the long-term retention of accumulated oxygen-containing gases exacerbates oxygen corrosion in the equipment, shortening the heater's service life. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a gas-liquid separation device for a heating network heater, which can achieve gas-liquid separation and liquid recovery within the heater, thereby improving heat exchange efficiency.

[0004] The gas-water separation device for a heating network heater according to an embodiment of the present invention includes a heating network heater body, a suction branch pipe, a suction main pipe, a gas-water separation tank, a vacuum unit, and a return pipe. The suction branch pipe is located in the gas phase space above the liquid level of the heating network heater body. The outlet end of the suction branch pipe is connected to the inlet end of the suction main pipe. The outlet end of the suction main pipe is connected to the inlet of the gas-water separation tank. An exhaust port is provided at the top of the gas-water separation tank, and the exhaust port of the gas-water separation tank is connected to the inlet end of the vacuum unit. A drain port is provided at the bottom of the gas-water separation tank, and the drain port of the gas-water separation tank is connected to the heating network heater body through the return pipe.

[0005] The gas-water separation device for the heat exchanger heater of this invention, by placing the extraction branch pipe in the gas phase space above the liquid level of the heat exchanger heater body and connecting it to the gas-water separation tank and vacuum unit via the extraction main pipe, can effectively extract the accumulated non-condensable gas and avoid the formation of a gas film on the surface of the heat exchange tube bundle; at the same time, the gas-water separation tank separates the water carried in the extracted gas, and the separated condensate is returned to the heat exchanger heater body via the return pipe, thus realizing the recovery of the working fluid.

[0006] Preferably, there are multiple exhaust branches arranged in parallel, and the outlet ends of the multiple exhaust branches are simultaneously connected to the inlet end of the exhaust main pipe; the exhaust end of the exhaust branch is arranged on at least one of the top of the shell side of the heating network heater, the gas phase zone at the end of the tube bundle, and the top of the water chamber.

[0007] Preferably, the main exhaust pipe is arranged parallel to the axial direction of the heating network heater; a plurality of exhaust branch pipes are sequentially connected along the length of the main exhaust pipe.

[0008] Preferably, each of the extraction branch pipes is connected in series with an isolation valve; a check valve is provided between the exhaust port of the gas-water separator and the vacuum unit.

[0009] Preferably, the isolation valve is an electric isolation valve or a manual isolation valve; the check valve is a vacuum check valve adapted to negative pressure conditions.

[0010] Preferably, the air extraction end of each of the air extraction branches adopts a quick-installation interface structure that supports installation without shutting down the machine.

[0011] Preferably, the gas-water separator is provided with a baffle plate and a wire mesh demister inside; along the height direction of the gas-water separator, the baffle plate is located above the wire mesh demister, and at least one of them is on the airflow path above the air inlet of the gas-water separator.

[0012] Preferably, the vacuum unit is a water ring vacuum pump unit or a Roots vacuum pump unit, and the vacuum unit is equipped with a frequency converter control unit that can automatically adjust the operating conditions according to the system vacuum level.

[0013] Preferably, the gas-water separation device of the heating network heater further includes a vacuum transmitter and a level switch for monitoring operating parameters and triggering interlocks; the vacuum transmitter is located on the pipeline of the gas extraction main pipe or the gas-water separation tank; the level switch is located on the side wall of the gas-water separation tank.

[0014] Preferably, both the vacuum transmitter and the level switch are connected to an interlocking control circuit; the interlocking control circuit is electrically connected to the vacuum unit and the valves on the corresponding pipelines, together forming an interlocking protection structure with triple protection against backflow, excessive level, and excessive pressure.

[0015] The gas-water separation device for a heating network heater provided by this invention, through the coordinated operation of multi-point air extraction, gas-water separation, condensate recirculation, and vacuum frequency conversion control and interlocking protection, can effectively discharge the non-condensable gases accumulated in the heating network heater and efficiently separate and recover the condensate. This device helps eliminate the film thermal resistance formed by non-condensable gases, improving heat exchange efficiency; reducing steam and condensate waste, increasing thermal energy utilization; reducing oxygen corrosion rate, extending equipment service life; eliminating water hammer and vibration, ensuring safe and stable system operation. Simultaneously, the quick-installation interface structure supports installation without shutting down the system. The coordination of the vacuum transmitter, level switch, and interlocking control circuit achieves automatic operation and triple safety protection, enabling the device to operate reliably for extended periods under unattended conditions, demonstrating good practical value and promising prospects for widespread application. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the present invention.

[0017] Figure label:

[0018] 1. Heater body of the heating network; 2. Suction branch pipe; 3. Suction main pipe; 4. Gas-water separator; 5. Vacuum unit; 6. Return pipe; 7. Isolation valve; 8. Vacuum check valve; 9. Baffle plate; 10. Wire mesh demister; 11. Vacuum transmitter; 12. Liquid level switch. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] like Figure 1 As shown, the gas-water separation device for a heating network heater according to an embodiment of the present invention includes a heating network heater body 1, a suction branch pipe 2, a suction main pipe 3, a gas-water separation tank 4, a vacuum unit 5, and a return pipe 6. The suction branch pipe 2 is located in the gas phase space above the liquid level of the heating network heater body 1. The outlet end of the suction branch pipe 2 is connected to the inlet end of the suction main pipe 3. The outlet end of the suction main pipe 3 is connected to the inlet of the gas-water separation tank 4. An exhaust port is provided at the top of the gas-water separation tank 4, and the exhaust port of the gas-water separation tank 4 is connected to the inlet end of the vacuum unit 5. A drain port is provided at the bottom of the gas-water separation tank 4, and the drain port of the gas-water separation tank 4 is connected to the heating network heater body 1 through the return pipe 6.

[0021] In this embodiment, the gas-water separation device for the heating network heater uses a gas extraction branch pipe 2 installed in the gas phase space above the liquid level of the heating network heater body 1. The accumulated non-condensable gas is introduced into the gas-water separation tank 4 through the gas extraction main pipe 3 for gas-water separation. The separated gas is extracted by the vacuum unit 5, and the condensate is returned to the heating network heater body 1 through the return pipe 6. This effectively discharges the non-condensable gas and recovers the condensate, which is beneficial to improving heat exchange efficiency and operating economy.

[0022] Specifically, the heating network heater body 1 is a conventional shell-and-tube heating network heater body 1, in which heating steam is introduced into the shell side, the heated medium is in the tube side, the lower part of the shell side is the condensate liquid phase region, and the upper part of the shell side is the gas phase space where steam and non-condensable gases coexist.

[0023] The extraction branch pipe 2 is located in the gas phase space above the liquid level of the heating network heater body 1, and is used to extract non-condensable gases accumulated inside the heating network heater body 1. The extraction end of the extraction branch pipe 2 extends into the gas phase space, and its outlet end is connected to the inlet end of the extraction main pipe 3. The diameter and material of the extraction branch pipe 2 are selected according to the specifications and operating parameters of the heating network heater body 1. In some specific embodiments, the extraction branch pipe 2 can be made of carbon steel or stainless steel.

[0024] The main exhaust pipe 3 collects the gases drawn from each exhaust branch pipe 2. Its inlet end is connected to the outlet end of the exhaust branch pipe 2, and the outlet end is connected to the inlet of the gas-water separator 4. The diameter of the main exhaust pipe 3 is usually larger than that of the exhaust branch pipe 2 to ensure smooth transportation of the collected gas.

[0025] The gas-liquid separator 4 is used to separate the incoming gas into water. An exhaust port is located at the top of the gas-liquid separator 4, which is connected to the air inlet of the vacuum unit 5, through which the separated dry gas is discharged. A drain port is located at the bottom of the gas-liquid separator 4, which is connected to the heating network heater body 1 via a return pipe 6. The separated condensate returns to the liquid phase space of the heating network heater body 1 via the return pipe 6 by gravity or pressure difference. In some specific embodiments, a drain valve may be installed on the return pipe 6 to prevent gas backflow while discharging condensate.

[0026] Vacuum unit 5 provides suction power for the entire device, enabling non-condensable gases to flow from the heating network heater body 1 through the suction branch pipe 2, the suction main pipe 3, and the gas-liquid separator 4 under negative pressure until they are discharged. The inlet of vacuum unit 5 is connected to the exhaust port of gas-liquid separator 4, and its exhaust port is open to the atmosphere or a subsequent treatment system.

[0027] During operation, after the vacuum unit 5 starts, it establishes a negative pressure within the system. Non-condensable gases accumulated inside the heating network heater body 1 are drawn in by the extraction branch pipe 2 under pressure differential, collected through the extraction header pipe 3, and then enter the gas-water separator 4. Inside the gas-water separator 4, moisture in the gas is separated, and the dry gas is extracted by the vacuum unit 5. The separated condensate is returned to the heating network heater body 1 via the return pipe 6. This achieves continuous discharge of non-condensable gases and recovery of condensate.

[0028] In some embodiments, there are multiple extraction branch pipes 2 arranged in parallel, and the outlet end of the multiple extraction branch pipes 2 is simultaneously connected to the inlet end of the extraction main pipe 3; the extraction end of the extraction branch pipe 2 is arranged on at least one of the shell top, the gas phase region at the end of the tube bundle, and the top of the water chamber of the heat network heater body 1.

[0029] This embodiment sets up multiple parallel extraction branches 2 and distributes the extraction ends in multiple key gas phase accumulation areas of the heating network heater body 1, which can achieve multi-point balanced extraction. Compared with single-point extraction, it can effectively eliminate dead zones for the accumulation of non-condensable gases and improve exhaust efficiency.

[0030] Specifically, in this embodiment, there are multiple extraction branch pipes 2, which are connected in parallel. That is, the air inlet end of each extraction branch pipe 2 extends independently into the corresponding extraction position, while the air outlet end is simultaneously connected to the air inlet end of the same extraction main pipe 3. This parallel structure allows each extraction branch pipe 2 to work independently without interfering with each other.

[0031] The extraction end of the extraction branch pipe 2 is arranged according to the actual accumulation pattern of non-condensable gases within the heat exchanger heater body 1. Specifically, the extraction end is located at least one of the following: the top of the shell side, the gas phase region at the end of the tube bundle, and the top of the water chamber. The top of the shell side is the main area where low-density non-condensable gases naturally rise and accumulate; the gas phase region at the end of the tube bundle is located at both ends of the heat exchanger tube bundle, where changes in steam velocity after passing through the tube bundle easily lead to gas stagnation; the top of the water chamber is the high-level space of the water chamber structure, which also easily accumulates non-condensable gases. In some specific embodiments, extraction ends can be set at two or all three of the above three locations, depending on the specific structural form of the heat exchanger heater body 1, to achieve the effect of covering all areas where gases easily accumulate. In other specific embodiments, extraction ends can also be added in other high-level areas of the heat exchanger heater body 1 to further improve the extraction coverage.

[0032] In some embodiments, the extraction main pipe 3 is arranged parallel to the axial direction of the heating network heater body 1; a plurality of extraction branch pipes 2 are sequentially connected along the length direction of the extraction main pipe 3.

[0033] In this embodiment, by arranging the main exhaust pipe 3 parallel to the axial direction of the heat network heater body 1 and connecting each exhaust branch pipe 2 sequentially along the length of the main pipe, the pipeline layout can be simplified, the pipeline resistance can be reduced, and the airflow of each exhaust branch pipe 2 can be more smoothly and evenly converged.

[0034] Specifically, the direction of the exhaust manifold 3 is consistent with the axial direction of the heat network heater body 1, that is, the manifold is laid parallel to the length of the heat network heater body 1 on one side or above the heat network heater body 1. This layout makes the distance between the manifold and the heat network heater body 1 basically consistent in all places, which facilitates the connection of each exhaust branch pipe 2 to the manifold with a shorter and closer path.

[0035] Multiple extraction branch pipes 2 are sequentially connected along the length of the extraction main pipe 3, that is, each extraction branch pipe 2 is connected to the corresponding axial position of the main pipe according to its axial arrangement position in the heating network heater body 1. In this way, the airflow of each branch pipe converges in the same axial direction in the main pipe, avoiding airflow collision and local eddies, which helps to reduce the friction resistance along the pipeline and make the extraction flow of each extraction branch pipe 2 more uniform.

[0036] In some embodiments, an isolation valve 7 is connected in series on each extraction branch pipe 2; a check valve is provided between the exhaust port of the gas-water separator 4 and the vacuum unit 5.

[0037] This embodiment, by setting an isolation valve 7 on each extraction branch pipe 2 and a check valve between the gas-water separator 4 and the vacuum unit 5, can achieve independent on / off control of a single extraction pipeline and prevent gas backflow, which is beneficial to improving the controllability and safety of system operation.

[0038] Specifically, each extraction branch pipe 2 is equipped with an isolation valve 7 connected in series. The isolation valve 7 is connected in series in the pipeline of the extraction branch pipe 2 and can independently control the opening and closing of that extraction pipeline. When a certain extraction branch pipe 2 needs maintenance or when extraction is not needed at that location temporarily, the corresponding isolation valve 7 can be closed without affecting the normal operation of other extraction branch pipes 2. Under maintenance conditions, it also facilitates segmented isolation and troubleshooting.

[0039] A check valve is installed between the exhaust port of the gas-liquid separator 4 and the inlet of the vacuum unit 5. Its function is to prevent outside air or exhaust gas from flowing back into the gas-liquid separator 4 or even the heating network heater body 1 through the pipeline when the vacuum unit 5 is stopped or the system pressure fluctuates. The check valve opens from the gas-liquid separator 4 towards the vacuum unit 5. The valve opens when the airflow passes in the forward direction and automatically closes when there is a reverse pressure difference.

[0040] In some embodiments, the isolation valve 7 is an electrically operated isolation valve 7 or a manually operated isolation valve 7; the check valve is a vacuum check valve 8 adapted to negative pressure conditions.

[0041] This embodiment specifies the specific types of isolation valve 7 and check valve. Electric isolation valve 7 is easy to remotely control and automate, while manual isolation valve 7 has a simple structure and low cost. Vacuum check valve 8 can reliably seal under negative pressure conditions to prevent gas backflow.

[0042] Specifically, the isolation valve 7 can be either an electric isolation valve 7 or a manual isolation valve 7, depending on the actual control requirements. The electric isolation valve 7 is driven to open and close by an electrical signal and can be connected to an automatic control system for remote operation and programmed control, making it suitable for applications requiring a high degree of automation. The manual isolation valve 7 relies on manual operation, has a simple structure, is easy to maintain, and has a lower cost, making it suitable for applications that do not require frequent switching. In some specific embodiments, a combination configuration of partially electric and partially manual isolation valves 7 can also be used.

[0043] Specifically, the check valve is a vacuum check valve 8 adapted for negative pressure conditions. Compared with ordinary check valves, the sealing structure of the vacuum check valve 8 is specially designed to maintain good sealing performance under low pressure and negative pressure conditions. Its valve disc and seat are usually made of negative pressure resistant sealing materials, which can effectively prevent micro-leakage caused by poor sealing when the vacuum degree is high.

[0044] In some embodiments, the air extraction end of each air extraction branch pipe 2 adopts a quick-installation interface structure that supports installation without shutting down the machine.

[0045] In this embodiment, the extraction end of the extraction branch pipe 2 adopts a quick-installation interface structure, which can be installed or replaced without stopping the operation of the heating network heater body 1. This avoids affecting normal heating due to the installation of the extraction device and is beneficial for non-stop modification of the existing heating network heater body 1.

[0046] Specifically, the quick-connect interface structure is a connection method that allows for pipeline connection without system shutdown. In some specific embodiments, the quick-connect interface can adopt a pressurized perforated connector or a clamp-type quick-connect connector. The pressurized perforated connector uses a special drilling tool to drill a hole in the housing of the heating network heater body 1, and the connector body provides a seal during and after drilling, without requiring system depressurization or shutdown. The clamp-type quick-connect connector uses a clamp to quickly lock and seal the exhaust branch pipe 2 to the reserved interface, making disassembly and assembly convenient.

[0047] In other specific embodiments, the quick-connect interface structure can also adopt flange quick-connect fittings or threaded quick-connect fittings, as long as it can safely and quickly complete the pipeline connection while the equipment is in operation.

[0048] In some embodiments, the gas-water separator 4 is provided with a baffle plate 9 and a wire mesh demister 10 inside; along the height direction of the gas-water separator 4, the baffle plate 9 is located above the wire mesh demister 10, and at least one of them is on the airflow path above the air inlet of the gas-water separator 4.

[0049] In this embodiment, a two-stage separation structure of baffle plate 9 and wire mesh demister 10 is set in the gas-water separator 4. The gas first passes through the baffle plate 9 for inertial collision separation, and then passes through the wire mesh demister 10 for fine interception. This can effectively improve the gas-water separation efficiency, reduce the water content of the gas entering the vacuum unit 5, and protect the operation of the vacuum unit 5.

[0050] Specifically, the baffle 9 is located above the wire mesh demister 10, and at least one of them is on the airflow path above the air inlet. That is, the airflow entering the gas-water separator 4 will be processed by at least one of the baffle 9 and the wire mesh demister 10 during its ascent.

[0051] In one specific embodiment, both the baffle plate 9 and the wire mesh demister 10 are located above the air inlet. The air inlet is located in the middle or lower side wall of the gas-liquid separator 4. After the gas enters the tank, it flows upward and first encounters the wire mesh demister 10. The wire mesh demister 10 is composed of multiple layers of metal or non-metal wire mesh. When the gas passes through the mesh, the fine droplets carried in the airflow are captured and aggregated by the mesh fibers, gradually forming larger droplets that then drip down under gravity. The gas continues to rise and passes through the baffle plate 9, which is composed of multiple inclined or bent plates, forcing the airflow to change direction multiple times. Due to their greater inertia, the droplets cannot follow the airflow through sharp turns and instead collide with the plates, thus achieving further separation. After two stages of separation, the dry gas is discharged from the exhaust port at the top of the tank, and the separated liquid water collects at the bottom of the tank and is discharged through the drain port and return pipe 6.

[0052] In another specific embodiment, only the baffle 9 may be located above the air inlet, and the wire mesh demister 10 may be arranged at the bottom of the tank as a pre-separation unit; or only the wire mesh demister 10 may be located above the air inlet, and the baffle 9 may be omitted or arranged in other positions. The plate angle and spacing of the baffle 9, as well as the wire mesh density and thickness of the wire mesh demister 10, can be selected according to the actual gas volume and moisture content to be processed.

[0053] In some embodiments, the vacuum unit 5 is a water ring vacuum pump unit or a Roots vacuum pump unit, and the vacuum unit 5 is equipped with a frequency converter control unit that can automatically adjust the operating conditions according to the system vacuum level.

[0054] This embodiment specifies the specific type and control method of the vacuum unit 5. The water ring vacuum pump unit or the Roots vacuum pump unit can better adapt to the suction conditions of humid gas. The frequency conversion control unit can automatically adjust the pump unit speed and output according to the system vacuum level, which is beneficial to reduce energy consumption while meeting the gas suction requirements.

[0055] Specifically, vacuum unit 5 can employ either a water ring vacuum pump unit or a Roots vacuum pump unit. The water ring vacuum pump unit uses water as the working fluid to form a liquid ring. The volume between the liquid ring and the blades is changed by the rotation of an eccentric impeller to achieve gas intake, compression, and exhaust. It is suitable for pumping gases containing water vapor or impurities, and it operates smoothly and is easy to maintain. The Roots vacuum pump unit uses a pair of opposing rotating figure-eight rotors to achieve gas intake and exhaust. It has a high pumping speed and a high ultimate vacuum, making it suitable for applications requiring high vacuum levels. In some specific embodiments, the water ring vacuum pump unit and the Roots vacuum pump unit can also be used in series to leverage their respective advantages.

[0056] Vacuum unit 5 is equipped with a variable frequency control unit (VFD), which is electrically connected to the drive motor in vacuum unit 5. This VFD automatically adjusts the motor speed and operating conditions according to changes in the system vacuum level. When the system vacuum level deviates from the set range, the VFD adjusts the pump speed to change the pumping volume, restoring the vacuum level to the target value. When the system vacuum level has reached the required level and tends to stabilize, the VFD can reduce the pump speed, reducing unnecessary energy consumption. Compared to fixed-frequency operation, VFD control can maintain higher operating efficiency over a wider load range, which is beneficial for energy saving and consumption reduction.

[0057] In some embodiments, a vacuum transmitter 11 and a level switch 12 are also included for monitoring operating parameters and triggering interlocks; the vacuum transmitter 11 is located on the pipeline of the gas extraction main pipe 3 or the gas-water separator 4; the level switch 12 is located on the side wall of the gas-water separator 4.

[0058] This embodiment, by adding a vacuum transmitter 11 and a level switch 12, can monitor the vacuum level of the system and the level of the gas-liquid separator 4 in real time, providing parameter trigger signals for interlock protection, which is beneficial to improving the automation level and safety protection capability of the system operation.

[0059] Specifically, the vacuum transmitter 11 is installed on the pipeline of the extraction header 3 or the gas-water separator 4 to detect the vacuum level in the pipeline or tank in real time and convert the vacuum level signal into an electrical signal output. The installation position of the vacuum transmitter 11 can be selected according to the monitoring requirements: when installed on the extraction header 3, it can directly reflect the vacuum level of the gas phase space of the heating network heater body 1; when installed on the pipeline of the gas-water separator 4, it can reflect the vacuum level of the separator under working conditions.

[0060] A level switch 12 is installed on the side wall of the gas-liquid separator 4 to monitor the level of condensate inside the tank. One or more level switches 12 can be configured, each corresponding to a different level alarm or interlock action threshold. In some specific embodiments, the level switch 12 can be a float-type level switch 12, a capacitive level switch 12, or an ultrasonic level switch 12, as long as it can reliably detect the level and output a switching signal.

[0061] The output signals of both the vacuum transmitter 11 and the level switch 12 can be connected to the upper control system or the interlocking control circuit as the triggering basis for automatic control and interlocking protection.

[0062] In some embodiments, both the vacuum transmitter 11 and the level switch 12 are connected to the interlocking control circuit; the interlocking control circuit is electrically connected to the vacuum unit 5 and the valves on the corresponding pipelines, together forming an interlocking protection structure with triple protection against backflow, excessive liquid level, and excessive pressure.

[0063] This embodiment connects the vacuum transmitter 11 and the level switch 12 to the interlocking control circuit and electrically connects them to the vacuum unit 5 and pipeline valves, thus constructing an interlocking protection structure with triple protection functions. This structure can effectively prevent abnormal operating conditions such as gas backflow, excessive liquid level, and excessive pressure, which is beneficial to ensuring the safe operation of the vacuum unit 5 and the heating network heater body 1.

[0064] Specifically, the interlocking control loop receives detection signals from the vacuum transmitter 11 and the level switch 12, and issues control commands to the vacuum unit 5 and the valves on the pipeline according to preset logic conditions.

[0065] The backflow prevention logic is as follows: when the interlock control circuit detects that the vacuum level is lower than the set lower limit (i.e., the system pressure rises to near or above atmospheric pressure), the check valve or related valve between the exhaust port of the gas-water separator 4 and the vacuum unit 5 is automatically closed, and the operation of the vacuum unit 5 is stopped to prevent external gas from flowing back into the system.

[0066] The logic for over-level protection is as follows: when the level switch 12 detects that the condensate level in the gas-water separator 4 has reached or exceeded the preset high level threshold, the interlock control circuit sends a signal to increase the drainage volume of the return pipe 6 or open the backup drainage path; when the level continues to rise and reaches the high-high level threshold, the interlock control circuit sends an alarm signal, and if necessary, the vacuum unit 5 can be stopped and the air inlet valve can be closed to prevent condensate from entering the vacuum unit 5.

[0067] The overpressure protection logic is as follows: when the vacuum transmitter 11 detects that the system pressure exceeds the upper limit of the allowable pressure, the interlock control circuit controls the vacuum unit 5 to reduce its speed or stop. At the same time, the pressure relief valve can be opened to relieve pressure, so as to protect the equipment and pipeline from overpressure damage.

[0068] The triple protection function can work simultaneously and cooperate with each other to automatically execute the corresponding protection action when abnormal operating conditions occur, enabling the system to operate safely under unattended conditions and effectively protect core equipment such as vacuum unit 5 and heat network heater body 1.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A gas-water separation device for a heating network heater, characterized in that, It includes the heating network heater body, the extraction branch pipe, the extraction main pipe, the gas-liquid separator, the vacuum unit, and the return pipe; The extraction branch pipe is located in the gas phase space above the liquid level of the heating network heater body; The outlet end of the extraction branch pipe is connected to the inlet end of the extraction main pipe. The outlet of the extraction main pipe is connected to the inlet of the gas-water separator. The top of the gas-water separator is provided with an exhaust port, which is connected to the air inlet of the vacuum unit. The bottom of the gas-water separator is provided with a drain outlet, which is connected to the heat network heater body through the return pipe.

2. The gas-water separation device for a heating network heater according to claim 1, characterized in that, The extraction branch pipes are multiple and connected in parallel, and the air outlets of the multiple extraction branch pipes are simultaneously connected to the air inlet of the extraction main pipe. The extraction end of the extraction branch pipe is located on at least one of the top of the shell side of the heating network heater body, the gas phase region at the end of the tube bundle, and the top of the water chamber.

3. The gas-water separation device for a heating network heater according to claim 2, characterized in that, The extraction header is arranged parallel to the axial direction of the heat network heater body. Multiple extraction branch pipes are sequentially connected along the length of the extraction main pipe.

4. The gas-water separation device for a heating network heater according to claim 2, characterized in that, Each of the aforementioned extraction branch pipes is connected in series with an isolation valve; A check valve is installed between the exhaust port of the gas-water separator and the vacuum unit.

5. The gas-water separation device for a heating network heater according to claim 4, characterized in that, The isolation valve is either an electric isolation valve or a manual isolation valve; The check valve is a vacuum check valve adapted to negative pressure conditions.

6. The gas-water separation device for a heating network heater according to claim 2, characterized in that, The air extraction end of each of the aforementioned air extraction branch pipes adopts a quick-installation interface structure that supports installation without shutting down the machine.

7. The gas-water separation device for a heating network heater according to claim 1, characterized in that, The gas-liquid separator is equipped with baffles and a wire mesh demister. Along the height direction of the gas-water separator, the baffle is located above the wire mesh demister, and at least one of them is on the airflow path above the air inlet of the gas-water separator.

8. The gas-water separation device for a heating network heater according to claim 1, characterized in that, The vacuum unit is a water ring vacuum pump unit or a Roots vacuum pump unit, and the vacuum unit is equipped with a frequency converter control unit that can automatically adjust the operating conditions according to the system vacuum level.

9. The gas-water separation device for a heating network heater according to claim 1, characterized in that, It also includes vacuum transmitters and level switches for monitoring operating parameters and triggering interlocks; The vacuum transmitter is installed on the main extraction pipe or the pipeline of the gas-water separator. The liquid level switch is located on the side wall of the gas-liquid separator.

10. The gas-water separation device for a heating network heater according to claim 9, characterized in that, Both the vacuum transmitter and the level switch are connected to an interlocking control circuit. The interlocking control circuit is electrically connected to the vacuum unit and the valves on the corresponding pipelines, together forming an interlocking protection structure with triple protection against backflow, excessive liquid level, and excessive pressure.

Images