A system for heating natural gas using deaerator exhaust steam as a heat source and its usage method.

Abstract

This invention relates to the field of heat source recovery technology, specifically disclosing a system and its method for heating natural gas using deaerator exhaust steam as a heat source. The system provided by this invention uses waste heat boiler deaerator exhaust steam as the core heat source and electric heating as the start-up heat source. It adopts a fully explosion-proof design, making it suitable for flammable and explosive environments such as pressure regulating stations. This effectively solves the problems of waste heat from deaerators, high energy consumption for dew point heating in pressure regulating stations, lack of start-up heat source, and missing energy linkage, ensuring the safe, stable, environmentally friendly, and efficient operation of pressure regulating stations and filling a technological gap in the industry.

Description

Technical Field

[0001] This invention belongs to the field of heat source recovery and reuse technology, and in particular relates to a system for heating natural gas using deaerator exhaust steam as a heat source and its usage method. Background Technology

[0002] Currently, when gas turbine combined cycle generator units are equipped with waste heat boilers and deaerators, they continuously generate high-temperature exhaust steam at temperatures of 80-150℃ and pressures of 0.1-0.3MPa. This exhaust steam is currently directly released into the atmosphere, resulting in significant energy waste as a result of unrecovered waste heat. Furthermore, existing pressure regulating stations use high-energy-consuming heat sources such as pure electric heating, oil heating, water bath heating, and low-pressure water from waste heat boilers for natural gas dew point heating, which not only leads to high operating costs but also poses safety hazards such as electrical safety issues and oil leaks. Additionally, oil and gas heating generate exhaust emissions, resulting in poor environmental performance. The existing deaerator waste heat recovery system and natural gas dew point heating system are independent of each other, lacking any coordinated design, failing to form a closed-loop energy utilization system of "waste heat recovery → dew point heating," and unable to complement each other to address their respective shortcomings. Therefore, a solution is urgently needed. Summary of the Invention

[0003] To address the problems in the aforementioned technologies, this invention provides a system and method for heating natural gas using deaerator exhaust steam as a heat source. By recovering the waste heat from the deaerator exhaust steam as the core heat source for dew point heating, and combining it with electric heating as the start-up heat source, the system achieves energy synergy between the waste heat boiler side and the pressure regulating station side. This effectively solves the problems of waste heat from the deaerator, high energy consumption for dew point heating in the pressure regulating station, lack of start-up heat source, and missing energy linkage, ensuring the safe, stable, environmentally friendly, and efficient operation of the pressure regulating station and filling a technological gap in the industry.

[0004] To achieve the aforementioned objective, the technical solution of the present invention is implemented as follows: a system for heating natural gas using deaerator exhaust steam as a heat source, comprising: A deaerator is used to supply exhaust steam for heating natural gas at the dew point. Natural gas transmission components for transporting natural gas; Exhaust gas collection and pretreatment components are used to pretreat the exhaust gas from the deaerator; The heat exchange component is used to receive the pretreated exhaust steam and exchange the waste heat of the exhaust steam with the heat of the natural gas; Dew point detection components are installed on the heat exchange components to detect natural gas dew point data in real time. The electric heating unit is used to heat the natural gas dew point when the deaerator has no qualified exhaust steam. The explosion-proof automatic control component is electrically connected to the natural gas transmission component, heat exchange component, dew point detection component, and electric heating component. It is used to control the automatic switching of the heat exchange component and electric heating component based on the natural gas dew point data detected by the dew point detection component, and to control the natural gas transmission component to open or close the natural gas transmission pipeline based on the temperature and pressure detected by the natural gas transmission component.

[0005] Preferably, it also includes an exhaust gas treatment component, which is used to condense the low-temperature exhaust steam after heat exchange, and the condensate is recycled to the boiler feedwater system for reuse, while the non-condensable gases are discharged to a designated area.

[0006] Preferably, the temperature of the exhaust steam from the deaerator is 80-150℃ and the pressure is 0.1-0.3MPa.

[0007] Preferably, the exhaust gas collection pretreatment assembly includes an explosion-proof filter and a first shut-off valve; the pretreatment includes discharging condensate from the exhaust gas and filtering impurities in the exhaust gas using the explosion-proof filter; the first shut-off valve is used to isolate the medium.

[0008] Preferably, the heat exchange component includes a dual-tube explosion-proof structure and adopts a counter-current heat exchange method, with a heat exchange efficiency of ≥85%.

[0009] Preferably, the natural gas transmission assembly includes an explosion-proof transmission pipeline, an explosion-proof flow control valve, and an explosion-proof pressure gauge; the explosion-proof flow control valve and the explosion-proof pressure gauge are both installed on the explosion-proof transmission pipeline used for transmitting natural gas.

[0010] Preferably, the dew point detection component includes an explosion-proof dew point sensor and an explosion-proof data transmission module installed at the outlet of the heat exchange component; the explosion-proof dew point sensor measures the temperature range of natural gas dew point from -60℃ to +20℃ with an accuracy of ±1℃; the explosion-proof data transmission module is electrically connected to both the explosion-proof dew point sensor and the explosion-proof automatic control component, and is used to detect natural gas dew point data in real time and transmit it to the explosion-proof automatic control component.

[0011] Preferably, the explosion-proof automatic control component includes an explosion-proof temperature sensor, an explosion-proof pressure sensor, a PLC controller, an explosion-proof bypass valve, and an explosion-proof alarm module; The PLC controller is electrically connected to the explosion-proof temperature sensor, explosion-proof pressure sensor, explosion-proof bypass valve, explosion-proof alarm module, natural gas transmission assembly, heat exchange assembly, and electric heating assembly.

[0012] Preferably, the electric heating component is an explosion-proof electric heater with a power of 30-50kW, and is electrically connected to the PLC controller.

[0013] Preferably, a method for using a system that heats natural gas using deaerator exhaust steam as a heat source includes the following steps: 1) System startup preparation: Turn on the power to start the entire system. The operator checks the sealing performance of all pipelines and equipment and the wiring connection. After confirming that there are no leaks or looseness, the PLC controller initializes the operating parameters, sets the target value of natural gas dew point and the qualified threshold of deaerator exhaust, and starts natural gas transmission. 2) Heating during startup: If the deaerator does not have qualified exhaust steam at this time, the electric heating component is activated simultaneously. The electric heating component starts to work and heats the natural gas in the natural gas transmission pipeline. The PLC controller dynamically adjusts the electric heating power and natural gas flow rate according to the real-time data transmitted by the dew point detection component until the natural gas dew point reaches the preset target value. Then, the qualified natural gas is stably delivered to the pressure regulating device of the pressure regulating station. 3) Automatic heat source switching: The gas turbine combined cycle generator set and its supporting waste heat boiler and deaerator are continuously preheated. When the PLC controller detects that the deaerator exhaust steam parameters have reached the qualified threshold through pressure and temperature sensors, it automatically shuts down the electric heating components and switches the system to the deaerator exhaust steam waste heat heating mode. 4) Stage heat exchange: The exhaust steam discharged from the deaerator is filtered for impurities and discharged condensate by the exhaust steam collection and pretreatment component, and then enters the hot medium channel of the heat exchange component to exchange heat with the natural gas in the cold medium channel in a countercurrent manner to achieve efficient transfer of waste heat. At the same time, the PLC controller monitors the exhaust steam temperature, pressure and natural gas dew point data in real time. 5) Dew point feedback adjustment: If the dew point detection component detects that the natural gas dew point has not reached the preset target value, the PLC controller will automatically reduce the natural gas flow rate and extend the heat exchange time of the natural gas in the heat exchange component to ensure that the dew point temperature meets the standard. If the deaerator exhaust parameters fluctuate or the waste heat supply is insufficient, the PLC controller will automatically activate the electric heating component for auxiliary heating to ensure dew point stability. 6) Exhaust gas treatment and recovery: After heat exchange, the low-temperature exhaust steam enters the explosion-proof condenser of the exhaust gas treatment component, where the water vapor is condensed into liquid water. It is periodically discharged through the explosion-proof drain pipe and recycled to the boiler feedwater system for reuse. The remaining non-condensable gases are discharged to the designated area through the exhaust gas discharge pipe. 7) Stable operation and shutdown: Once the system enters a stable operating state, the PLC controller continuously monitors the operating parameters of each component. If any abnormal parameters occur, the explosion-proof alarm module is immediately activated, and the shutdown protection is triggered. When a shutdown is required, the valve for deaerator exhaust steam to the dew point heating system is closed first, and then the natural gas transmission pipeline and all electrical equipment are closed. After the system temperature drops to normal, the main power supply is turned off, and the equipment cleaning and maintenance are completed.

[0014] The beneficial effects of this invention are reflected in: (1) This invention uses the waste heat from the deaerator exhaust as the core heat source for dew point heating, which greatly reduces the dependence of the pressure regulating station on high-energy-consuming heat sources such as electricity, fuel oil, and natural gas, effectively solves the problem of waste heat from the deaerator, and has significant energy-saving effect.

[0015] (2) The system provided by the present invention adopts a fully explosion-proof design, which is suitable for flammable and explosive scenarios of pressure regulating stations. It is equipped with electric heating as a start-up heat source, which solves the problem of no heat source when the system starts up. At the same time, the heat source switching and dew point adjustment are realized through PLC automatic control, which ensures the safe and stable operation of the pressure regulating station and avoids the risk of pipeline freezing and corrosion.

[0016] (3) This invention is the first to realize the energy synergy between the deaerator side and the pressure regulating station side, filling the technological gap in the industry. At the same time, it recovers condensate and discharges qualified waste gas through the exhaust gas treatment component, taking into account environmental protection and water resource recycling, and reducing operating costs and maintenance workload. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a system architecture diagram of the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a system for heating natural gas using deaerator exhaust steam as a heat source and a method for using the system.

[0020] Example 1: A system for heating natural gas using deaerator exhaust steam as a heat source. This system uses deaerator exhaust steam from a waste heat boiler as the core heat source and electric heating as the start-up heat source. The entire system adopts a fully explosion-proof design, suitable for flammable and explosive environments such as pressure regulating stations. The functions and parameters of each component are as follows: The deaerator, used to supply exhaust steam for natural gas dew point heating, is a core heat source supply component that can stably supply high-temperature exhaust steam at 80-150℃ and 0.1-0.3MPa. The exhaust steam collection and pretreatment assembly is used to pretreat the exhaust steam from the deaerator. It includes an explosion-proof filter and a first shut-off valve; the pretreatment includes discharging condensate from the exhaust steam and filtering impurities from the exhaust steam using the explosion-proof filter; the first shut-off valve is used to isolate the heating medium, enabling switching of the heating medium.

[0021] The heat exchange component adopts a double-tube explosion-proof structure and uses a counter-current heat exchange method with a heat exchange efficiency of ≥85%. It is used to receive the pre-treated exhaust steam and exchange the exhaust steam waste heat with the heat of natural gas, thereby achieving efficient heat exchange between the deaerator exhaust steam waste heat and natural gas. The dew point detection component, installed on the heat exchange component, is used to detect the dew point data of natural gas in real time.

[0022] The dew point detection component includes an explosion-proof dew point sensor and an explosion-proof data transmission module installed at the outlet of the heat exchange component. The explosion-proof dew point sensor measures the temperature range of natural gas dew point from -60℃ to +20℃ with an accuracy of ±1℃. The explosion-proof data transmission module is electrically connected to both the explosion-proof dew point sensor and the explosion-proof automatic control component, and is used to detect natural gas dew point data in real time and transmit it to the explosion-proof automatic control component.

[0023] The explosion-proof automatic control component is electrically connected to the natural gas transmission component, heat exchange component, dew point detection component, and electric heating component. It is used to control the automatic switching of the heat exchange component and electric heating component based on the natural gas dew point data detected by the dew point detection component, and to control the natural gas transmission component to open or close the natural gas transmission pipeline based on the temperature and pressure detected by the natural gas transmission component.

[0024] The explosion-proof automatic control components include explosion-proof temperature sensors, explosion-proof pressure sensors, PLC controllers, explosion-proof bypass valves, and explosion-proof alarm modules. These components are installed on the natural gas pipeline. The temperature and pressure sensors are used to detect the temperature and pressure of the natural gas at the outlet of the heat exchange components and promptly feed the detected parameters back to the control system. The explosion-proof bypass valves and alarm modules are primarily used to achieve pressure balance in the natural gas pipeline, emergency bypass venting, and alarm functions.

[0025] The PLC controller is electrically connected to the explosion-proof temperature sensor, explosion-proof pressure sensor, explosion-proof bypass valve, explosion-proof alarm module, natural gas transmission assembly, heat exchange assembly, and electric heating assembly.

[0026] It is used to realize automatic switching of heat source, precise adjustment of natural gas dew point, system pressure and temperature protection, and fault alarm shutdown; The electric heating element is used to heat the natural gas dew point when there is no qualified exhaust steam from the deaerator. The electric heating element is an explosion-proof electric heater with a power of 30-50kW, and is linked to the PLC controller. It only starts when the system starts up and there is no qualified exhaust steam, ensuring that the dew point heating meets the standard during the start-up phase. Natural gas transmission components used for transporting natural gas.

[0027] The natural gas transmission assembly includes explosion-proof transmission pipelines, explosion-proof flow control valves, and explosion-proof pressure gauges. The explosion-proof flow control valves and explosion-proof pressure gauges are installed on the explosion-proof transmission pipelines used to transport natural gas, to stabilize the transmission of natural gas, and to work with the explosion-proof automatic control assembly to regulate the natural gas flow rate and adapt to heat exchange requirements.

[0028] The exhaust gas treatment assembly includes an explosion-proof condensate tank, an explosion-proof drain pipe, an exhaust gas discharge pipe, and a second one-way valve. It is used to condense the low-temperature exhaust steam after heat exchange, with a condensate recovery rate of ≥85%, which can be recycled to the boiler feedwater system for reuse. Non-condensable gases are safely discharged to a designated area.

[0029] like Figure 1 As shown: The connection relationships of the above components are as follows: The deaerator exhaust port is connected to the exhaust steam collection and pretreatment component via a dedicated explosion-proof pipeline. The outlet of the exhaust steam collection and pretreatment component is connected to the heat medium inlet of the heat exchange component. The heat medium outlet of the heat exchange component is connected to the tail gas treatment component, which completes condensate recovery and exhaust gas emission. The natural gas pipeline is connected to the explosion-proof flow control valve. The outlet of the flow control valve is connected to the cold medium inlet of the heat exchange component. The cold medium outlet of the heat exchange component is connected to the dew point detection component. The outlet of the dew point detection component is connected to the pressure regulating device of the pressure regulating station. The PLC controller is electrically connected to all electrical components and detection components via explosion-proof wiring to realize automatic control of the entire system.

[0030] Example 2: A method of using a system that heats natural gas using deaerator exhaust steam as a heat source includes the following steps: 1. System Startup Preparation: Start the entire system, check the sealing performance of all explosion-proof components and the wiring connections, and confirm that there are no leaks or looseness. Then, initialize the operating parameters of the PLC controller, and set the natural gas dew point target value (5-10℃ higher than the lowest ambient temperature) and the deaerator exhaust steam qualification threshold (temperature ≥80℃, pressure ≥0.1MPa) in sequence. Start the natural gas supply. If there is no qualified exhaust steam from the deaerator at this time, the electric heating components will be activated simultaneously. 2. Start-up heating phase: The electric heating component starts working to heat the natural gas in the natural gas pipeline. The PLC controller dynamically adjusts the electric heating power and natural gas flow rate based on the real-time data transmitted by the dew point detection component until the natural gas dew point reaches the preset target value. Then, the qualified natural gas is stably delivered to the pressure regulating device of the pressure regulating station. 3. Automatic heat source switching: The gas turbine combined cycle generator set and its supporting waste heat boiler and deaerator are continuously preheated. When the PLC controller detects that the deaerator exhaust steam parameters have reached the qualified threshold through pressure and temperature sensors, it automatically shuts down the electric heating components and switches the system to the core mode of deaerator exhaust steam waste heat heating. 4. Core stage heat exchange: The high-temperature exhaust steam discharged from the deaerator is filtered for impurities and discharged condensate by the exhaust steam collection and pretreatment component, and then enters the hot medium channel of the double-tube heat exchange component to exchange heat with the natural gas in the cold medium channel in a countercurrent manner, so as to achieve efficient transfer of waste heat. At the same time, the PLC controller monitors the exhaust steam temperature, pressure and natural gas dew point data in real time. 5. Dew point feedback adjustment: If the dew point detection component detects that the natural gas dew point has not reached the preset target value, the PLC controller will automatically reduce the natural gas flow rate and extend the heat exchange time of the natural gas in the heat exchange component to ensure that the dew point meets the standard; if the deaerator exhaust parameters fluctuate or the waste heat supply is insufficient, the PLC controller will automatically activate the electric heating component for auxiliary heating to ensure dew point stability. 6. Exhaust gas treatment and recovery: The low-temperature exhaust steam after heat exchange (temperature dropped to 60-80℃) enters the explosion-proof condenser of the exhaust gas treatment component, where the water vapor is condensed into liquid water, which is periodically discharged through the explosion-proof drain pipe and recycled to the boiler feedwater system for reuse. The remaining non-condensable gases are discharged to the designated area through the exhaust gas discharge pipe. 7. Stable Operation and Shutdown: Once the system enters a stable operating state, the PLC controller continuously monitors the operating parameters of each component. If any abnormal parameters occur, the explosion-proof alarm module is immediately activated, and the shutdown protection is triggered. When a shutdown is required, the valve for deaerator exhaust steam to the dew point heating system is closed first, then the natural gas transmission pipeline and all electrical components are closed, and the main power supply is turned off after the system temperature drops to normal. Equipment cleaning and maintenance are then completed.

[0031] In summary, the system and method for heating natural gas using deaerator exhaust steam as a heat source provided by this invention achieve the following: Heat source classification and energy linkage: The innovative design adopts "deaerator exhaust steam as the core heat source and electric heating as the start-up heat source" to achieve deep synergy between deaerator waste heat recovery and natural gas dew point heating on the pressure regulating station side, filling a technological gap in the industry.

[0032] Explosion-proof design for the whole system: All components of the system adopt explosion-proof structures, comply with the explosion-proof standards of the GB 3836 series, are adapted to the special operation scenarios of the pressure regulating station where flammable and explosive substances exist, and at the same time are adapted to the temperature and pressure characteristics of the deaerator exhaust steam, ensuring the safe operation of the system; Efficient heat exchange and precise control: Adopt a double-tube countercurrent heat exchange structure, with a heat exchange efficiency ≥ 85% to achieve efficient utilization of waste heat; equipped with explosion-proof automatic control components to achieve precise regulation of the natural gas dew point (accuracy ±1°C) and automatic switching of heat sources, ensuring the stable operation of the system; Tail gas recovery and utilization: Set up exclusive tail gas treatment components to achieve the recovery of condensed water from the low-temperature exhaust steam after heat exchange (recovery rate ≥ 85%) and the safe discharge of non-condensable gases, taking into account energy conservation, environmental protection and water resource recovery and utilization, and enhancing the comprehensive benefits of the system.

[0033] In addition, on the premise of not changing the core purpose of this invention and not deviating from the core design (deaerator exhaust steam as the core heat source, electric heating as the starting heat source, energy linkage, full explosion-proof), the following alternative solutions can be adopted, which can also achieve the purpose of this invention: Component substitution: The deaerator can be replaced with a thermal deaerator of a waste heat boiler supporting a combined cycle gas turbine generator set of the same type, as long as it can stably supply high-temperature exhaust steam at 80 - 150°C and 0.1 - 0.3 MPa; the power of the electric heating component can be adjusted as required according to the natural gas treatment volume of the pressure regulating station (adjustment range 25 - 55 kW); the filter aperture of the explosion-proof filter can be adjusted according to the impurity content of the deaerator exhaust steam (adjustment range 2 - 6 μm); Heat exchange structure substitution: The heat exchange component can be replaced with an explosion-proof shell-and-tube countercurrent heat exchanger, as long as it can retain the countercurrent heat exchange method, ensure a heat exchange efficiency ≥ 85%, comply with the GB 3836 explosion-proof standard, and be adapted to the overall operation parameters of the system; Control method substitution: The PLC controller can be replaced with other explosion-proof controllers of the same standard, as long as it can achieve the core control logics such as automatic switching of heat sources, precise regulation of the natural gas dew point, monitoring of system parameters, and fault alarm and shutdown.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A system for heating natural gas using deaerator exhaust steam as a heat source, characterized in that, include: A deaerator is used to supply exhaust steam for heating natural gas at the dew point. Natural gas transmission components for transporting natural gas; Exhaust gas collection and pretreatment components are used to pretreat the exhaust gas from the deaerator; The heat exchange component is used to receive the pretreated exhaust steam and exchange the waste heat of the exhaust steam with the heat of the natural gas; Dew point detection components are installed on the heat exchange components to detect natural gas dew point data in real time. The electric heating unit is used to heat the natural gas dew point when the deaerator has no qualified exhaust steam. The explosion-proof automatic control component is electrically connected to the natural gas transmission component, heat exchange component, dew point detection component, and electric heating component. It is used to control the automatic switching of the heat exchange component and electric heating component based on the natural gas dew point data detected by the dew point detection component, and to control the natural gas transmission component to open or close the natural gas transmission pipeline based on the temperature and pressure detected by the natural gas transmission component.

2. The system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, It also includes an exhaust gas treatment component, which is used to condense the low-temperature exhaust steam after heat exchange, and the condensate is recycled to the boiler feedwater system for reuse, while non-condensable gases are discharged to a designated area.

3. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The temperature of the exhaust steam from the deaerator is 80-150℃, and the pressure is 0.1-0.3MPa.

4. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The exhaust gas collection pretreatment assembly includes an explosion-proof filter and a first shut-off valve; the pretreatment includes discharging condensate from the exhaust gas and filtering impurities in the exhaust gas using the explosion-proof filter; the first shut-off valve is used to isolate the medium.

5. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The heat exchange component includes a dual-tube explosion-proof structure and adopts a counter-current heat exchange method, with a heat exchange efficiency of ≥85%.

6. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The natural gas transmission assembly includes an explosion-proof transmission pipeline, an explosion-proof flow control valve, and an explosion-proof pressure gauge; the explosion-proof flow control valve and the explosion-proof pressure gauge are both installed on the explosion-proof transmission pipeline used to transmit natural gas.

7. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The dew point detection component includes an explosion-proof dew point sensor and an explosion-proof data transmission module installed at the outlet of the heat exchange component. The explosion-proof dew point sensor measures the temperature range of natural gas dew point from -60℃ to +20℃ with an accuracy of ±1℃. The explosion-proof data transmission module is electrically connected to both the explosion-proof dew point sensor and the explosion-proof automatic control component, and is used to detect natural gas dew point data in real time and transmit it to the explosion-proof automatic control component.

8. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 1, characterized in that, The explosion-proof automatic control component includes an explosion-proof temperature sensor, an explosion-proof pressure sensor, a PLC controller, an explosion-proof bypass valve, and an explosion-proof alarm module; The PLC controller is electrically connected to the explosion-proof temperature sensor, explosion-proof pressure sensor, explosion-proof bypass valve, explosion-proof alarm module, natural gas transmission assembly, heat exchange assembly, and electric heating assembly.

9. A system for heating natural gas using deaerator exhaust steam as a heat source according to claim 8, characterized in that, The electric heating component is set as an explosion-proof electric heater with a power of 30-50kW, and is electrically connected to the PLC controller.

10. A method of using a system for heating natural gas using deaerator exhaust steam as a heat source according to any one of claims 1-9, characterized in that, The method includes the following steps: 1) System startup preparation: Turn on the power to start the entire system. The operator checks the sealing performance of all pipelines and equipment and the wiring connection. After confirming that there are no leaks or looseness, the PLC controller initializes the operating parameters, sets the target value of natural gas dew point and the qualified threshold of deaerator exhaust, and starts natural gas transmission. 2) Heating during startup: If the deaerator does not have qualified exhaust steam at this time, the electric heating component is activated simultaneously. The electric heating component starts to work and heats the natural gas in the natural gas transmission pipeline. The PLC controller dynamically adjusts the electric heating power and natural gas flow rate according to the real-time data transmitted by the dew point detection component until the natural gas dew point reaches the preset target value. Then, the qualified natural gas is stably delivered to the pressure regulating device of the pressure regulating station. 3) Automatic heat source switching: The gas turbine combined cycle generator set and its supporting waste heat boiler and deaerator are continuously preheated. When the PLC controller detects that the deaerator exhaust steam parameters have reached the qualified threshold through pressure and temperature sensors, it automatically shuts down the electric heating components and switches the system to the deaerator exhaust steam waste heat heating mode. 4) Stage heat exchange: The exhaust steam discharged from the deaerator is filtered for impurities and discharged condensate by the exhaust steam collection and pretreatment component, and then enters the hot medium channel of the heat exchange component to exchange heat with the natural gas in the cold medium channel in a countercurrent manner to achieve efficient transfer of waste heat. At the same time, the PLC controller monitors the exhaust steam temperature, pressure and natural gas dew point data in real time. 5) Dew point feedback adjustment: If the dew point detection component detects that the natural gas dew point has not reached the preset target value, the PLC controller will automatically reduce the natural gas flow rate and extend the heat exchange time of the natural gas in the heat exchange component to ensure that the dew point temperature meets the standard. If the deaerator exhaust parameters fluctuate or the waste heat supply is insufficient, the PLC controller will automatically activate the electric heating component for auxiliary heating to ensure dew point stability. 6) Stable operation and shutdown: Once the system enters a stable operating state, the PLC controller continuously monitors the operating parameters of each component. If any abnormal parameters occur, the explosion-proof alarm module is immediately activated, and the shutdown protection is triggered. When a shutdown is required, the valve for deaerator exhaust steam to the dew point heating system is closed first, and then the natural gas transmission pipeline and all electrical equipment are closed. After the system temperature drops to normal, the main power supply is turned off, and the equipment cleaning and maintenance are completed.

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