Pressure stabilizing system and device for petrochemical low-temperature waste heat recovery system

Abstract

The invention relates to the technical field of petrochemical low-temperature waste heat recovery systems, and particularly discloses a pressure stabilizing system and device for a petrochemical low-temperature waste heat recovery system. Comprising a surge tank, an automatic water replenishing valve, a safety valve and a communicating pipe, an air inlet pipe and an exhaust pipe are further arranged on the surge tank, an automatic constant pressure valve is arranged on the air inlet pipe, an automatic exhaust pressure relief valve is arranged on the exhaust pipe, and a surge tank pressure monitor is arranged on the surge tank; the automatic constant pressure valve, the automatic exhaust pressure relief valve and the surge tank pressure monitor are all electrically connected with a PICA controller. The pressure stabilizing tank is further provided with a pressure stabilizing tank liquid level monitor and a pressure stabilizing tank liquid level meter, and the automatic water supplementing valve and the pressure stabilizing tank liquid level monitor are both electrically connected with the LICA controller. A water injection pump of the pressure stabilizing system of the heating medium water pipe network is frequently started and stopped, a safety valve frequently jumps, and the system pressure is unstable.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature waste heat recovery systems for petrochemical industry, and in particular to a voltage stabilizing system and device for low-temperature waste heat recovery systems for petrochemical industry. Background Art

[0002] Low-temperature waste heat recovery systems usually use water as a heat medium to recycle low-grade heat energy and supply it to other heat energy units to achieve energy saving and consumption reduction in industrial production. In order to avoid introducing impurities and polluting the water body of the recovery system and to avoid scaling on the inner wall of the waste heat recovery system pipes, the heat medium water pipeline network of the waste heat recovery system is usually a closed system. In order to ensure the stable, safe and reliable operation of the waste heat recovery system, it is necessary to ensure the stability of the internal pressure of the waste heat recovery system pipes. Therefore, most waste heat recovery systems are equipped with water replenishment, constant pressure and exhaust systems before the waste heat recovery system circulating water pump.

[0003] In the petrochemical industry, due to the high energy consumption, it will produce a large amount of low-temperature waste gas and waste water. Therefore, the low-temperature waste heat recovery system is widely used, and the recovered heat can be supplied to other heat energy units, such as lithium bromide refrigeration, desalted water preheating in thermal power plants, heating, etc.

[0004] However, a make-up water pump is usually used to maintain the constant pressure in front of the circulating water pump of the waste heat recovery system in the chemical industry. When the system is under-pressure, the make-up water pump is turned on to inject water and increase the pressure. When the pressure is over-pressured, the safety valve is activated to release the pressure. For example, a medium-pressure waste heat recoverer is disclosed in the patent document with application number CN202211601507.3. The structure of the medium-pressure waste heat recoverer is provided with a make-up water pipe, which is extended to the middle part of the inner cavity of the pressure stabilizing device to replenish water and stabilize the pressure, thereby ensuring efficient heat exchange while reducing the impact of water fluctuations on the heat exchange tubes.

[0005] However, this method has the following problems in the petrochemical industry: the energy consumption in the petrochemical industry is large, and there are many processes for utilizing the recovered heat. Therefore, with the changes in production, the control parameters of the heat medium water pipeline network of the waste heat recovery system change frequently, which makes the operating parameters of the heat medium water pipeline network of the waste heat recovery system (such as heat load, temperature, flow, etc.) change a lot. When the operating parameters (heat load, temperature, flow, etc.) change, the system pressure changes sharply and frequently. In order to stabilize the pressure, the water injection pump is frequently started and stopped and the safety valve is frequently activated to stabilize the pressure; this not only causes the water injection pump to start and stop frequently, and the service life is reduced, and maintenance and overhaul are often required, so its maintenance cost is high, and the frequent activation of the water injection pump has a lag in replenishing water, resulting in unstable system pressure. Summary of the invention

[0006] The purpose of the present invention is to provide a pressure stabilizing system and device for a low-temperature waste heat recovery system in a petrochemical industry, so as to solve the technical problems mentioned above in the petrochemical industry, that when the operating parameters of the waste heat recovery system in the prior art change a lot, the injection pump of the pressure stabilizing system of the heat medium water pipeline network frequently starts and stops, and the safety valve frequently trips, resulting in a reduced service life of the injection pump and the safety valve, high maintenance costs, and unstable system pressure.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a pressure stabilizing device for a low-temperature waste heat recovery system of a petrochemical industry, comprising a pressure stabilizing tank, an automatic water replenishment valve and a safety valve arranged at the upper end of the pressure stabilizing tank, and a connecting pipe connected to the heat medium water pipeline network of the waste heat recovery system, characterized in that: the pressure stabilizing tank is also provided with an air intake pipe and an exhaust pipe, the air intake pipe is provided with an automatic constant pressure valve, the exhaust pipe is provided with an automatic exhaust pressure relief valve, and the pressure stabilizing tank is provided with a pressure stabilizing tank pressure monitor; the automatic constant pressure valve, the automatic exhaust pressure relief valve and the pressure stabilizing tank pressure monitor are all electrically connected to a PICA controller;

[0008] A pressure stabilizing tank liquid level monitor and a pressure stabilizing tank liquid level gauge are also provided in the tank body of the pressure stabilizing tank, and the automatic water replenishment valve and the pressure stabilizing tank liquid level monitor are both electrically connected to the LICA controller.

[0009] The present invention also discloses a pressure stabilizing system for a petrochemical low-temperature waste heat recovery system, which is used to control the pressure stabilizing device for the petrochemical low-temperature waste heat recovery system, including a detection device, a control device and a host computer, wherein the detection device includes a pressure stabilizing tank pressure monitor for detecting the gas pressure in the pressure stabilizing tube, a pressure stabilizing tank liquid level monitor and a pressure stabilizing tank liquid level gauge for detecting the liquid level in the pressure stabilizing tank, and the control device includes an automatic water filling valve, an automatic constant pressure valve and an automatic exhaust pressure relief valve;

[0010] The host computer includes a data receiving module and a startup control module;

[0011] A data receiving module, used for receiving the pressure index of the pressure monitoring instrument of the pressure regulating tank and the liquid level index of the pressure regulating tank liquid level monitoring instrument and the pressure regulating tank liquid level gauge;

[0012] The start-up control module is used to control the opening and closing of the automatic water supply valve, the automatic constant pressure valve and the automatic exhaust pressure relief valve.

[0013] The beneficial effects of this embodiment are:

[0014] 1. The pressure stabilizing structure of the waste heat recovery system in the prior art usually uses a water replenishment pump to replenish water and stabilize the pressure in the pressure stabilizing tank. Water is an incompressible fluid. Therefore, when the pressure in the tank is too small, the water replenishment pump is directly turned on to replenish water. Due to the inertia of the water body, too much water replenishment at the same time will cause a large adjustment range. When the pressure in the tank is too large, the safety valve of the water body will jump up and the water in the tank will be pumped out. It is also easy to cause too much water to flow out due to the inertia of the water body in the tank. Therefore, the adjustment of the pressure in the tank is relatively rough. For slight pressure changes, the adjustment is often excessive and fine adjustment cannot be achieved. In addition, in the petrochemical industry, the energy consumption in petrochemicals is large, which has a great impact on the recovery. There are many processes for utilizing the collected heat. There may be more than a dozen equipment or sections whose waste heat needs to be recovered, and correspondingly, there are more than a dozen production sections that need to utilize waste heat. However, due to the long distance between the workshops and production lines in the factory, they are usually connected by a heat medium water pipeline network. The length of the pipeline is very long. The utilization of waste heat in each section will also change with production in different time periods. Therefore, the heat medium water pipeline network control of the remaining heat recovery system also needs to change accordingly, resulting in many changes in the detection and operating parameters (such as heat load, temperature, flow, etc.) of the heat medium water pipeline network. The changes in operating parameters cause sharp and frequent changes in system pressure. The water injection pump needs to be frequently started and stopped to replenish water and regulate the pressure in order to stabilize the pressure. However, due to the defects of the pressure regulation of the water body itself, it is easy to over-regulate. For example, when the pressure in the tank is small, the water injection pump is replenishing water and regulating the pressure. Suddenly, a section that uses waste heat stops using waste heat, the flow rate in the pipeline slows down, and the pressure in the tank suddenly increases. At this time, the water injection pump has already started to replenish water and regulate, causing the pressure in the tank to be over-regulated and the regulation to lag, which leads to the frequent start-up and stop of the water body's safety valve for pressure stabilization. This not only causes the water injection pump to start and stop frequently, shortens its service life, and requires frequent maintenance and overhaul, so its maintenance cost is high, but also causes frequent start-up and stop. There is a lag in the water replenishment of the water injection pump, which leads to unstable system pressure. The present application utilizes a certain amount of gas phase space left in the pressure-regulating tank, utilizes the compressed air pipeline network (or nitrogen pipeline network) of the petrochemical enterprise to control the pressure of the pressure-regulating tank, and utilizes the desalted water pipeline network of the petrochemical enterprise to control the liquid level of the pressure-regulating tank. The liquid phase of the pressure-regulating tank is connected to the heat medium water pipeline network system through a connecting pipe. According to the static balance principle of the fluid, when the pressure of the heat medium water pipeline network system is low, the compressed air (or nitrogen) pressurizes the desalted water in the pressure-regulating tank to the pipeline network to replenish water and achieve pressurization. When the liquid level of the pressure-regulating tank is low, the desalted water inlet pipe control valve automatically controls the replenishment amount to maintain the normal range of the liquid level.When the pressure of the heat medium water pipe network system is high, the hot water in the pipe network expands into the pressure regulating tank, the liquid level rises, and the gas phase in the pressure regulating tank is compressed. When the gas phase pressure exceeds the set value, the pressure relief valve automatically opens to release the pressure. Due to the existence of the gas phase space, the pressure stabilizing system of the petrochemical low-temperature waste heat recovery system in this application is compared with the prior art. The pressure stabilizing medium in the prior art is only water, and water is an incompressible fluid. Therefore, the adjustment range is large and fine adjustments cannot be made. The existence of the gas phase space utilizes the compressibility of the gas. When the system pressure changes slightly, the gas phase is used to supplement the pressure. The gas phase and the water form a composite pressure stabilizing method to ensure the stability of the system pressure of the heat medium water pipe network system. At the same time, due to the existence of the gas phase, the heat medium water pipe network system has great operational flexibility. The pressure stabilizing system integrates automatic water replenishment, automatic pressure setting, and automatic exhaust. It has no mechanical power equipment and has low operating and maintenance costs.

[0015] Furthermore, a pressure stabilizing tank liquid level gauge is also provided in the pressure stabilizing tank.

[0016] Furthermore, both the PICA controller and the LICA controller realize automatic control on a DCS system or a PLC system.

[0017] Furthermore, the detection equipment also includes a pressure-stabilizing tank level gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a connection flow chart of an embodiment of the present invention,

[0019] Figure 2 It is a logic block diagram of a control and regulation system in a voltage stabilization system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] In the following description of the invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. The term "connection" only indicates the connection between devices and has no special meaning.

[0022] In addition, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as there is no conflict between them.

[0023] The figure marks in the drawings of the specification include: a pressure-stabilizing tank 1, an automatic constant pressure valve 2, an automatic water supply valve 3, an automatic exhaust pressure relief valve 4, a safety valve 5, a pressure-stabilizing tank pressure monitor 6, a pressure-stabilizing tank liquid level monitor 7, a pressure-stabilizing tank liquid level gauge 8, a connecting pipe 9, a heat medium water pipeline 101, a heat unit 102, a waste heat unit 103, a compressed air network pipe 11, and a desalted water network 12.

[0024] Implementation example Figures 1-2 As shown: A pressure stabilizing device for a low-temperature waste heat recovery system of a petrochemical industry, including a pressure stabilizing tank 1, which is a closed tank body. A water supply pipe, an air intake pipe, a safety exhaust pipe and a pressure monitoring pipe are arranged in sequence from left to right at the upper end of the pressure stabilizing tank 1. An automatic water supply valve 3 is arranged on the water supply pipe. The automatic water supply valve 3 uses a pneumatic or electric shut-off valve LV101. When the liquid level in the pressure stabilizing tank is too low and water needs to be replenished, the automatic water supply valve 3 on the water supply pipe can be opened to introduce the salt water in the desalted water pipe network 12 into the pressure stabilizing tank 1 to stabilize the pressure. An automatic constant pressure valve 2 is arranged on the air intake pipe. The automatic constant pressure valve 2 uses a pneumatic or electric regulating valve PV101. When the gas pressure in the pressure stabilizing tank 1 is too low, the automatic constant pressure valve 2 is opened to replenish the compressed air in the compressed air network pipe 11 into the pressure stabilizing tank 1 to stabilize the gas pressure of the pressure stabilizing tank 1. A safety valve 5 is provided on the safety exhaust pipe. The safety valve 5 uses the full-open safety valve PSV101. When the pressure in the tank exceeds the set pressure of the safety valve, or the normal adjustment of the exhaust pipe of the tank fails, the safety valve 5 automatically trips to quickly release the pressure in the surge tank 1 to below the design pressure of the surge tank to ensure the safety of the surge tank 1. A surge tank pressure monitor 6 is installed on the pressure monitoring pipe. The surge tank pressure monitor 6 uses the pressure transmitter PT101. The surge tank pressure monitor 6 is used to detect the pressure change in the surge tank 1.

[0025] An exhaust pipe is welded on the circumference of the tank body of the pressure-sustaining tank 1, and an automatic exhaust pressure relief valve 4 is installed on the exhaust pipe. When the gas phase pressure in the tank exceeds the set safety value, the pressure can be released through the automatic exhaust pressure relief valve 4 to adjust the pressure in the pressure-sustaining tank 1, thereby controlling the pressure in the heat medium water pipeline 101 of the waste heat recovery system. A pressure-sustaining tank liquid level monitor 7 and a pressure-sustaining tank liquid level gauge 8 are also installed on the circumference of the pressure-sustaining tank 1. The pressure-sustaining tank liquid level monitor 7 and the pressure-sustaining tank liquid level gauge 8 are used to monitor the liquid level in the tank to ensure that the liquid level is stable at the set height, the liquid level index is accurately detected, and the change of the liquid level is controlled, so as to achieve the purpose of controlling the static pressure of the pressure-sustaining tank on the heat medium water pipeline 101 of the waste heat recovery system, and also to achieve the purpose of controlling the pressure of the heat medium water pipeline 101 of the waste heat recovery system.

[0026] A connecting pipe 9 is provided at the bottom of the pressure stabilizing tank 1, and the pressure stabilizing tank 1 is connected to the heat medium water pipeline 101 of the waste heat recovery system through the connecting pipe 9. Therefore, heat medium water can be added to the heat medium water pipeline 101 of the waste heat recovery system, so that the pressure in the heat medium water pipeline 101 of the waste heat recovery system is stable and controllable. The heat medium water pipeline 101 of the waste heat recovery system absorbs the heat of the waste heat unit 103 by its own circulation, and circulates it to the heat unit 102 for use by the heat-using equipment.

[0027] The voltage stabilizing device for the low-temperature waste heat recovery system of petrochemical industry of the present application also includes a PICA controller and a LICA controller. Both the LICA controller and the PICA controller realize automatic control on the DCS system or the PLC system.

[0028] The PICA controller is electrically connected to the automatic constant pressure valve 2, the automatic exhaust pressure relief valve 4 and the pressure monitoring instrument 6 of the pressure regulating tank. When in operation, the PICA controller can receive the pressure index of the pressure regulating tank pressure monitoring instrument 6, and judge the pressure of the heat medium water pipeline 101 of the waste heat recovery system by comparing it with the preset pressure value range. When the pressure index is less than the lower limit of the preset pressure value range and the pressure is too low, the PICA controller controls the automatic constant pressure valve 2 to open, replenish the gas pressure in the pressure regulating tank 1, and the gas phase pressure in the pressure regulating tank 1 increases, forcing the liquid phase in the pressure regulating tank 1 to enter the heat medium water pipeline 101, so that the pressure in the heat medium water pipeline 101 is restored. When the pressure index is greater than the upper limit of the preset pressure value range and the pressure is too high, the PICA controller controls the automatic exhaust pressure relief valve 4 to open and release the pressure, and the liquid phase changes in the opposite way. In this way, it can be ensured that the pressure regulating tank 1 controls the pressure in the heat medium water pipeline 101, thereby ensuring the stability of the pressure in the waste heat recovery system.

[0029] The LICA controller is electrically connected to the automatic water replenishment valve 3 and the pressure tank liquid level monitor 7. During operation, the LICA controller receives the liquid level index of the pressure tank liquid level monitor 7 and compares it with the set liquid level value. When the liquid level index is lower than the set liquid level value, the LICA controller controls the automatic water replenishment valve 3 to replenish water to avoid the liquid level in the pressure tank being too low, and the gas phase heat medium water pipeline 101, resulting in a reduction in the residual heat recovery efficiency. The liquid level data of the pressure tank liquid level gauge 8 on the pressure tank 1 will be compared with the pressure tank liquid level monitor 7. When the difference is too large, the alarm set on the pressure tank 1 can be directly controlled to alarm.

[0030] The present invention also discloses a voltage stabilizing system for a low-temperature waste heat recovery system in a petrochemical industry, which is used to control the voltage stabilizing device for the low-temperature waste heat recovery system in a petrochemical industry, including a detection device, a control device and a host computer. Figure 2As shown, it includes a data receiving module and a start-up control module, the detection equipment includes a pressure regulator tank pressure monitor 6 for detecting the air pressure in the pressure regulator tube, a pressure regulator tank level monitor 7 and a pressure regulator tank level gauge 8 for detecting the liquid level in the pressure regulator tank, and the control equipment includes an automatic water replenishment valve 3, an automatic constant pressure valve 2 and an automatic exhaust pressure relief valve 4;

[0031] The host computer includes a data receiving module and a startup control module;

[0032] A data receiving module, used to receive the pressure index of the pressure-sustaining tank pressure monitor 6 and the liquid level index of the pressure-sustaining tank liquid level monitor 7 and the pressure-sustaining tank liquid level gauge;

[0033] The startup control module is used to control the opening and closing of the automatic water filling valve 3, the automatic constant pressure valve 2 and the automatic exhaust pressure relief valve 4. The startup control module is electrically connected to the PICA controller and the LICA controller. Therefore, the startup control module can transmit the opening or closing signal to the PICA controller and the LICA controller, and the PICA controller and the LICA controller control the opening and closing of the automatic water filling valve 3, the automatic constant pressure valve 2 and the automatic exhaust pressure relief valve 4 in the control device. During operation, it is necessary to first input the set liquid level value L and the preset pressure value range P in the startup control module. 0 -P X The data receiving module receives the pressure indicators P of the pressure monitoring device 6 and the liquid level monitoring device 7 of the pressure monitoring device. 1 With liquid level indicator L 1 After that, by starting the control module and setting the liquid level range value L X -L and preset pressure value range P 0 -P X For comparison, when P 1 Greater than P X When the pressure in the pressure regulating tank 1 is high and in the pressure release stage, it is necessary to reduce the pressure in the pressure regulating tank 1. The automatic exhaust pressure relief valve 4 can be directly controlled to exhaust and release the pressure. 1 Less than P X , and greater than P 0 When P is , the pressure stabilizing tank 1 is in the pressure stabilizing stage. At this time, no operation is performed on the pressure stabilizing tank 1, and the pressure is stabilized by utilizing the compressibility of the gas phase in the pressure stabilizing tank 1. 1 Less than P 0 , under the pressure of the pressure regulating tank 1, it is in the pressurization stage. At this time, the liquid level indicator L 1 Compared with L, when L 1 When the liquid level in the tank is greater than L, the gas phase pressure is increased, and the start control module transmits the signal of opening the automatic constant pressure valve 2 to the PICA controller. The PICA controller controls the automatic constant pressure valve 2 to open and increases the gas phase pressure in the pressure regulating tank 1. When L 1When it is less than L, liquid phase pressure is increased, and the start control module transmits a signal to open the automatic water supply valve 3 to the LICA controller. The LICA controller controls the automatic water supply valve 3 to open and increase the liquid phase pressure in the pressure regulating tank 1.

[0034] Regardless of the state of the pressure in the surge tank 1, when L 1 Less than L X When the liquid level is at a dangerous level, the startup control module transmits the signal of opening the automatic water replenishment valve 3 to the LICA controller. The LICA controller controls the automatic water replenishment valve 3 to open and replenish water. When the liquid level returns to the L value, the gas phase pressure p 1 When the gas phase pressure gradually increases during the water replenishment process and exceeds the mechanical design safety pressure of the safety valve 5, the safety pressure of the safety valve is greater than P X , in this embodiment, P X twice of the pressure, it will directly open the safety valve 5 and release the gas phase pressure of the pressure regulating tank 1. Therefore, the safety valve is the last insurance for tank pressure control.

[0035] The voltage stabilizing system of the present application is also provided with a liquid level abnormality alarm before the data receiving module, and a liquid level data adjustment module is provided in the liquid level abnormality alarm. The liquid level data adjustment module will periodically compare the liquid level index detected by the voltage stabilizing tank liquid level monitor 7 with the liquid level index detected by the voltage stabilizing tank liquid level meter 8. When the difference is too large and greater than the set value, a liquid level alarm will be directly generated to indicate that the liquid level index data is abnormal. When the difference is within the set value range, the liquid level index detected by the voltage stabilizing tank liquid level monitor 7 can be directly transmitted to the data receiving module.

[0036] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pressure stabilizing device for a low-temperature waste heat recovery system in a petrochemical industry, comprising a pressure stabilizing tank, an automatic water supply valve and a safety valve arranged at the upper end of the pressure stabilizing tank, and a connecting pipe connected to a heat medium water pipeline network of the waste heat recovery system, characterized in that: The pressure-stabilizing tank is also provided with an air inlet pipe and an exhaust pipe, the air inlet pipe is provided with an automatic constant pressure valve, the exhaust pipe is provided with an automatic exhaust pressure relief valve, and the pressure-stabilizing tank is provided with a pressure-stabilizing tank pressure monitor; the automatic constant pressure valve, the automatic exhaust pressure relief valve and the pressure-stabilizing tank pressure monitor are all electrically connected to a PICA controller; A pressure stabilizing tank liquid level monitor is also provided in the tank body of the pressure stabilizing tank, and the automatic water replenishment valve and the pressure stabilizing tank liquid level monitor are both electrically connected to the LICA controller.

2. The voltage stabilizing device for a low-temperature waste heat recovery system in a petrochemical industry according to claim 1, characterized in that: A pressure stabilizing tank liquid level gauge is also provided in the pressure stabilizing tank.

3. The voltage stabilizing device for a low-temperature waste heat recovery system in a petrochemical industry according to claim 1, characterized in that: The PICA controller and the LICA controller both realize automatic control on a DCS system or a PLC system.

4. A voltage stabilizing system for a low-temperature waste heat recovery system in a petrochemical industry, used to control the voltage stabilizing device for a low-temperature waste heat recovery system in a petrochemical industry according to any one of claims 1 to 3, characterized in that: It includes detection equipment, control equipment and host computer, the detection equipment includes a pressure-stabilizing tank pressure monitor for detecting the air pressure in the pressure-stabilizing tube, and a pressure-stabilizing tank liquid level monitor for detecting the liquid level in the pressure-stabilizing tank, and the control equipment includes an automatic water filling valve, an automatic constant pressure valve and an automatic exhaust pressure relief valve; The host computer includes a data receiving module and a startup control module; A data receiving module, used for receiving the pressure index of the pressure monitoring instrument of the pressure regulating tank and the liquid level index of the liquid level monitoring instrument of the pressure regulating tank; The start-up control module is used to control the opening and closing of the automatic water supply valve, the automatic constant pressure valve and the automatic exhaust pressure relief valve.

5. The pressure stabilizing system for a low-temperature waste heat recovery system in a petrochemical industry according to claim 4, characterized in that: The detection equipment also includes a pressure-stabilizing tank liquid level gauge.

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