A method for protecting a gas engine intake and exhaust system

Abstract

This invention discloses a protection method for the intake and exhaust system of a gas engine, including an intake ventilation method, a nitrogen purging method, and an exhaust ventilation method. The intake ventilation method, implemented through an intake ventilation system, is used to purge leaked gas from the gas pipeline to a safe area and to discharge any remaining combustible gas in the gas pipeline. The nitrogen purging method, implemented through a nitrogen purging system, is used to purge combustible gas from the gas pipeline and fill the pipeline with nitrogen. The exhaust ventilation method, implemented through an exhaust ventilation system, is used to ventilate the exhaust system of the gas engine and discharge any combustible gas that may be present in the exhaust pipe. The intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can operate independently or in combination. This invention can provide safety protection for the intake and exhaust system during long-term shutdown, maintenance, operation, and emergency shutdown of a gas engine, improving the operational safety of the gas engine.

Description

Technical Field

[0001] This invention relates to the field of gas engine technology, and in particular to a method for protecting the intake and exhaust systems of a gas engine. Background Technology

[0002] Currently, for gas turbine engines that inject gaseous fuel into the engine's air intake manifold at low pressure downstream of the turbocharger, a common approach is to install a gas detector above the engine. When the detected leaked gas concentration reaches a preset threshold, the detector sends a signal to the control box, triggering an alarm and initiating a shutdown. However, this method only provides risk alarms and passive shutdown; it cannot fundamentally eliminate the leak source and interrupts continuous engine operation, affecting equipment availability.

[0003] Some gas supply pipelines for gas engines require a double-walled pipe structure, with vent valves used to actively release leaked gas. For example, Chinese invention patent CN 116696618 A, published on September 5, 2023, proposes an intrinsically safe engine gas supply system and control method. This system includes a vent valve on the pipe section between the gas filter and the pressure reducing valve, which opens in case of engine start failure, emergency shutdown, or malfunction to release gas from the internal gas pipe and internal gas rail. However, this vent valve only operates under specific conditions and cannot achieve real-time release of leaked gas in the gas supply pipeline. Furthermore, its protection range is limited to the intake pipe between the gas supply equipment and the engine, and it cannot handle residual gas in the engine intake pipe, leaving a risk of combustible gas accumulation.

[0004] For the issue of residual combustible mixture in the exhaust pipe after engine start-up failure or shutdown, existing technologies, such as the Chinese Utility Model Patent CN 208669396 U (authorization announcement date: March 29, 2019), provide an explosion-proof pressure relief device that can quickly relieve pressure in the event of exhaust pipe detonation, thereby reducing system pressure and protecting pipeline components. However, this device is a reactive protection mechanism and cannot actively purge the exhaust pipe, making it difficult to prevent the accumulation of combustible mixture during engine shutdown, thus still posing a potential risk of detonation.

[0005] Furthermore, existing technologies lack a comprehensive solution for the coordinated protection of the intake and exhaust systems of gas engines. For example, patent CN 113818973 A, published on December 21, 2021, discloses a gas supply system and its operating method for a gas engine or dual-fuel engine, proposing to inject inert gas into the gas fuel pipeline during purging operations or fuel mode switching to achieve pipeline purging. However, this system still has the following limitations: 1. The system has a complex structure and a large number of valves, which leads to high difficulty in operation and high cost; 2. It fails to cover the protection requirements for air supply equipment and pipelines during long-term engine shutdown or maintenance periods; 3. It does not address the treatment of the exhaust system, and cannot effectively remove combustible gases that may accumulate in the exhaust pipe when the engine is shut off or the mode is switched.

[0006] In summary, current technologies are still unable to achieve real-time, proactive, and coordinated protection of the intake and exhaust systems while ensuring continuous and stable engine operation, making it difficult to fundamentally eliminate the safety hazards caused by combustible gas leakage and accumulation. Therefore, there is an urgent need to develop a simple, responsive, and comprehensive protection method for the intake and exhaust systems of gas engines. Summary of the Invention

[0007] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the present invention proposes a protection method for the intake and exhaust system of a gas engine, which can provide safety protection for the intake and exhaust system during long-term shutdown, maintenance, operation, and emergency shutdown of the gas engine, thereby improving the safety of gas engine use.

[0008] A method for protecting the intake and exhaust systems of a gas engine according to an embodiment of the present invention includes: An air intake ventilation method, wherein the air intake ventilation method is implemented by an air intake ventilation system, which is used to purge leaked gas from the gas pipeline to a safe area and to discharge combustible gas remaining in the gas pipeline; A nitrogen purging method, wherein the nitrogen purging method is implemented by a nitrogen purging system, which is used to purge combustible gas in a gas pipeline and fill the pipeline with nitrogen. An exhaust ventilation method, wherein the exhaust ventilation method is implemented through an exhaust ventilation system, which is used to ventilate the exhaust system of a gas engine and remove combustible gases that may be present in the exhaust pipe; The air intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can work independently or in combination.

[0009] The gas engine intake and exhaust protection method according to an embodiment of the present invention includes an intake ventilation method, a nitrogen purging method, and an exhaust ventilation method. On the one hand, the intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can be used independently to ensure the safety of the equipment and gas pipeline during long-term shutdown and maintenance of the gas engine, and also avoid the risk of gas leakage during the operation of the gas engine. On the other hand, the intake ventilation method, the nitrogen ventilation method, and the exhaust ventilation method can also work together to ensure the safety protection of the gas engine during operation and after emergency shutdown, thereby improving the safety of the gas engine.

[0010] In some embodiments of the present invention, the air intake ventilation system includes: A gas supply pipeline, wherein the gas supply pipeline is connected to the air intake end of the gas engine; The first valve is installed on the gas supply pipeline and is used to control the gas supply. The second valve, one end of which is connected to the gas supply pipeline in front of the first valve; The third valve, one end of which is connected to the gas supply pipeline behind the first valve; A venting pipeline, which is connected to the outside and connected to the other end of the third valve and the other end of the second valve; A ventilation duct is provided, which is sleeved outside the gas supply pipeline. A first fan is provided in the annular space formed between the ventilation duct and the gas supply pipeline. The ventilation outlet of the ventilation duct is equipped with a fireproof net.

[0011] In some embodiments of the present invention, the air intake ventilation method includes: When the gas engine is in a long-term stopped state, the first valve is closed and the second and third valves are opened to connect the gas supply pipeline to the atmosphere and discharge the combustible gas in the pipeline.

[0012] In some embodiments of the present invention, the nitrogen purging system includes: Nitrogen cylinder, used to supply nitrogen gas; An intake pipe is located between the exhaust ventilation system and the intake end of the gas engine; The fourth valve is connected to the end of the air inlet pipe and the air outlet of the nitrogen tank.

[0013] In some embodiments of the present invention, the nitrogen purging method includes: When performing maintenance on the gas engine, open the first valve and the fourth valve, and close the second valve and the third valve, so that nitrogen gas enters the engine intake manifold from the nitrogen tank through the fourth valve, purging the combustible gas in the engine intake manifold and the gas supply line, and filling the line with nitrogen gas.

[0014] In some embodiments of the present invention, the method further includes a combined protection step during the operation of the gas engine: Once the gas engine starts successfully, the first valve and the first fan are opened, and the second, third, and fourth valves are closed, so that the intake ventilation system continues to work. The ventilation capacity of the first fan is 30 air changes per hour to purge the leaked gas from the gas supply pipeline to a safe area.

[0015] In some embodiments of the present invention, the exhaust ventilation system includes: An exhaust ventilation device is installed on an external exhaust pipe connected to the exhaust end of the gas engine for ventilation. An explosion relief valve is installed on the external exhaust pipe. A waste heat boiler is installed on the external exhaust pipe, located behind the explosion relief valve, and is used to recover waste heat from the exhaust gas. The spark extinguishing silencer is installed on the external exhaust pipe and located at the rear of the waste heat boiler. It is used to extinguish sparks and reduce noise. The exhaust ventilation device includes a second fan and a ventilation valve; the ventilation valve is located between the second fan and the external exhaust pipe and is used to regulate the air volume.

[0016] In some embodiments of the present invention, the exhaust ventilation method includes: Turn on the second fan and ventilation valve to activate the exhaust ventilation system, ventilate the engine's exhaust system, and expel any combustible gases that may be present in the exhaust pipe.

[0017] In some embodiments of the present invention, the method further includes safety protection steps after an emergency shutdown of the gas engine: Close the first valve to stop the air intake ventilation system from working; Open the second valve and the third valve to release the residual gas in the gas supply pipeline before the third valve to a safe area; Open the fourth valve to activate the nitrogen purging system, purge the engine intake manifold, and purge the residual gas in the engine intake manifold and the gas supply line between the engine and the third valve to a safe area through the venting line. Simultaneously, the second fan and ventilation valve are turned on to activate the exhaust ventilation system, remove any combustible gases that may be present in the exhaust pipe, and discharge them to a safe area through the explosion relief valve, waste heat boiler, and spark extinguishing silencer on the engine's external exhaust pipe.

[0018] In some embodiments of the present invention, the explosion relief valve is provided with an opening pressure. When the gas engine malfunctions and the gas pressure in the exhaust pipe reaches the opening pressure, the explosion relief port of the explosion relief valve automatically opens to release the pressure, and the explosion relief port automatically closes after the pressure is released. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the gas engine intake and exhaust system protection method according to the present invention.

[0020] In the picture: 1. Gas supply pipeline; 2. Ventilation duct; 3. First fan; 4. Fireproof mesh; 5. First valve; 6. Second valve; 7. Third valve; 8. Venting pipeline; 9. Gas engine; 901. Inlet pipe; 902. Exhaust outlet; 10. Fourth valve; 11. Nitrogen tank; 12. External exhaust pipeline; 13. Exhaust ventilation device; 1301. Second fan; 1302. Ventilation valve; 14. Explosion relief valve; 1401. Explosion relief port; 15. Waste heat boiler; 16. Spark extinguishing silencer. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0022] The following is for reference. Figure 1 A method for protecting the intake and exhaust systems of a gas engine according to an embodiment of the present invention is described, including an intake ventilation method, a nitrogen purging method, and an exhaust ventilation method. The intake ventilation method is implemented through an intake ventilation system and is used to purge leaked gas from the gas pipeline to a safe area and to discharge combustible gas remaining in the gas pipeline. The nitrogen purging method is implemented through a nitrogen purging system and is used to purge combustible gas in the gas pipeline and fill the pipeline with nitrogen. The exhaust ventilation method is implemented through an exhaust ventilation system and is used to ventilate the exhaust system of the gas engine and discharge combustible gas that may be present in the exhaust pipe. The intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can operate independently or in combination.

[0023] The gas engine intake and exhaust protection method according to an embodiment of the present invention includes an intake ventilation method, a nitrogen purging method, and an exhaust ventilation method. On the one hand, the intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can be used independently to ensure the safety of the equipment and gas pipeline during long-term shutdown and maintenance of the gas engine, and also avoid the risk of gas leakage during the operation of the gas engine. On the other hand, the intake ventilation method, the nitrogen ventilation method, and the exhaust ventilation method can also work together to ensure the safety protection of the gas engine during operation and after emergency shutdown, thereby improving the safety of the gas engine.

[0024] In some embodiments of the present invention, the intake ventilation system includes: a gas supply pipeline 1, a first valve 5, a second valve 6, a third valve 7, a venting pipeline 8, a ventilation duct 2, and a first fan 3. The gas supply pipeline 1 is connected to the intake end of the gas engine 9. The first valve 5 is installed on the gas supply pipeline 1 and is used to control the gas supply. One end of the second valve 6 is connected to the gas supply pipeline 1 in front of the first valve 5. One end of the third valve 7 is connected to the gas supply pipeline 1 in rear of the first valve 5. The venting pipeline 8 is connected to the outside and is connected to the other end of the third valve 7 and the other end of the second valve 6. The ventilation duct 2 is sleeved outside the gas supply pipeline 1. The first fan 3 is installed in the annular space formed between the ventilation duct 2 and the gas supply pipeline 1. The ventilation outlet of the ventilation duct 2 is equipped with a fireproof mesh 4.

[0025] For example, the first valve 5 is a fault-closed type, while the second valve 6 and third valve 7 are fault-open types. The first valve 5, second valve 6, and third valve 7 can be manually or automatically reset. Under normal circumstances, the first valve 5 is open, and the second valve 6 and third valve 7 are closed, ensuring the gas supply to the gas engine 9 and its normal operation. When the gas engine 9 malfunctions, the first valve 5 automatically closes, and simultaneously, the second valve 6 and third valve 7 automatically open to cut off the gas supply. At the same time, any gas that may be present in the gas supply pipeline 1 can be released through the second valve 6 and third valve 7 and discharged to a safe area through the venting pipeline 8. To ensure safety, the outlet of the venting pipeline 8 should be located in a position where flammable gas and air mixtures will not ignite, and a fireproof mesh should be installed at the outlet. The ventilation duct 2 is fitted outside the gas supply pipeline 1, with one end connected to the air inlet of the gas engine 9. The first valve 5 and second valve 6 are also enclosed within the ventilation duct 2. The first fan 3 should meet the explosion-proof protection requirements of the installation area and is installed at the end of the ventilation duct 2 furthest from the gas engine 9. Ventilation outlets should be located in places where they will not ignite the mixture of combustible gas and air, and should be equipped with fireproof mesh 4.

[0026] When the gas engine 9 starts successfully, the first valve 5 opens and the second valve 6 and the third valve 7 close, allowing gas to be supplied to the gas engine 9 and ensuring its normal operation. At the same time, the first fan 3 automatically starts and begins to work, ventilating the annular space formed between the ventilation duct 2 and the gas supply pipeline 1. This promptly blows any leaked gas from the ventilation duct 2 and the gas supply pipeline 1 to a safe area, preventing the accumulation of combustible gas and thus achieving better safety protection.

[0027] The intake ventilation method of this invention ensures that there is no combustible gas in the gas pipe when the gas engine is stopped for a long period of time. Specifically: When the gas engine 9 is in a long-term stopped state, the first valve 5 is closed, and the second valve 6 and the third valve 7 are opened. This stops the gas supply to the gas engine 9 and simultaneously connects the gas supply pipeline 1 to the atmosphere via the vent pipeline 8, releasing combustible gas from the pipeline. This prevents combustible gas from remaining and accumulating in the gas pipeline, ensuring the safety of the gas pipeline and thus the safety of the gas engine 9 during long-term shutdown. By controlling the first valve 5, the second valve 6, and the third valve 7, safety protection for the gas engine under different operating conditions can be achieved.

[0028] Of course, to further improve its safety, a nitrogen purging system can be used in conjunction with this system. The nitrogen purging system is controlled to deliver nitrogen into the gas pipeline. The input of nitrogen can completely expel the combustible gas in the gas supply pipeline 1 and fill the pipeline with nitrogen, ensuring the safety of the gas pipeline and thus improving the safety of the gas engine.

[0029] In some embodiments of the present invention, the nitrogen purging system may include: a nitrogen tank 11, an inlet pipe 901, and a fourth valve 10. The nitrogen tank 11 is used to provide nitrogen as the purging gas; the inlet pipe 901 is located between the exhaust ventilation system and the intake end of the gas engine 9; the fourth valve 10 is connected to the end of the inlet pipe 901 and the outlet end of the nitrogen tank 11. For example, the inlet pipe 901 is connected to the gas supply line 1 and the intake end of the gas engine 9. The fourth valve 10 is a solenoid valve.

[0030] The nitrogen purging method of this invention ensures that there is no combustible gas in the gas pipeline during the maintenance of the gas engine. Specifically: When performing maintenance on the gas engine 9, open the first valve 5 and the fourth valve 10, and close the second valve 6 and the third valve 7. This allows nitrogen gas to enter the intake pipe 901 from the nitrogen tank 11 through the fourth valve 10. The nitrogen gas can purge the combustible gas in the intake pipe 901 and the gas supply pipeline 1 before the gas engine 9, and fill the pipeline with nitrogen gas, ensuring the safety of the equipment and the gas pipeline.

[0031] The method of this invention can also achieve combined protection during the operation of a gas engine by setting up a combined intake ventilation method and a nitrogen ventilation method, thereby avoiding the risk of gas leakage during engine operation. Specifically: Once the gas engine starts successfully, the first valve 5 and the first fan 3 are opened, and the second valve 6, the third valve 7 and the fourth valve are closed, so that the intake ventilation system continues to work. The ventilation capacity of the first fan 3 is 30 air changes per hour to purge the gas leaking from the gas supply pipeline to a safe area.

[0032] In some embodiments of the present invention, the exhaust ventilation system may include: an exhaust ventilation device 13 for ventilation, an explosion relief valve 14, a waste heat boiler 15 for recovering waste heat from exhaust gas, and a spark extinguishing silencer 16 for extinguishing sparks and reducing noise. The exhaust ventilation device 13 is installed on an external exhaust pipe 12 connected to the exhaust end of the gas engine 9. The explosion relief valve 14, the waste heat boiler 15, and the spark extinguishing silencer 16 are also sequentially installed on the external exhaust pipe 12; specifically, the explosion relief valve 14 is installed on the external exhaust pipe 12; the waste heat boiler 15 is installed on the external exhaust pipe 12, located behind the explosion relief valve 14, for recovering waste heat from exhaust gas; and the spark extinguishing silencer 16 is installed on the external exhaust pipe 12, located behind the waste heat boiler 15, for extinguishing sparks and reducing noise. The exhaust ventilation device 13 may include a second fan 1301 and a ventilation valve 1302. The ventilation valve 1302 is located between the second fan 1301 and the external exhaust pipe 12 and is used to regulate the air volume. For example, the second fan 1301 is a centrifugal fan, the external exhaust pipe 12 is connected to the exhaust outlet 902 of the gas engine 9, and the exhaust ventilation device 13 needs to be close to the engine turbocharger. The capacity of the second fan 1301 should be sufficient to purify air with a minimum volume equal to twice the volume of the exhaust system. The ventilation valve 1302 is used to regulate the airflow and should be able to withstand the high temperature of the exhaust system.

[0033] The exhaust ventilation method of the present invention ensures that there is no combustible gas in the exhaust pipe, specifically: The second fan 1301 and ventilation valve 1302 are activated to operate the exhaust ventilation system, ventilating the exhaust system of the gas engine 9, expelling any combustible gases that may be present in the exhaust pipe, and discharging them to a safe area through the explosion relief valve 14, waste heat boiler 15, and spark extinguishing silencer 16 on the external exhaust pipe 12. The waste heat boiler 15 can be used to recover waste heat from the engine exhaust, reducing thermal pollution and energy loss caused by high-temperature flue gas emissions.

[0034] In some embodiments of the present invention, the explosion relief valve 14 is provided with an opening pressure. When the gas engine 9 malfunctions and the gas pressure in the exhaust pipe reaches the opening pressure, the explosion relief port of the explosion relief valve 14 automatically opens to release the pressure. After the pressure is released, the explosion relief port 1401 automatically closes.

[0035] Understandably, the explosion relief valve 14 is equipped with an opening pressure. When the gas engine malfunctions and the gas pressure in the exhaust pipe rises sharply, reaching the opening pressure of the explosion relief valve 14, the explosion relief port 1401 of the explosion relief valve 14 automatically opens to release the pressure in the exhaust pipe. After the pressure is released, the explosion relief port 1401 of the explosion relief valve 14 automatically returns to the closed state.

[0036] In view of this, by setting up a combined intake ventilation method, a nitrogen ventilation method, and an exhaust ventilation method, it is also possible to ensure the safety of the gas engine during operation and after emergency shutdown. Specifically: When the gas engine shuts down in an emergency, close the first valve 5 to stop the intake ventilation system. Open the second valve 6 and the third valve 7 to release the residual gas in the gas supply line 1 before the third valve 7 to a safe area. Open the fourth valve 10 to activate the nitrogen purging system, which purges the engine intake pipe 901, releasing the residual gas in the engine intake pipe 901 and the gas supply line 1 between the gas engine 9 and the third valve 7 through the venting line 8 to a safe area. Simultaneously, activate the second fan 1301 and the ventilation valve 1302 to activate the exhaust ventilation system, removing any combustible gases that may be present in the exhaust pipe, and venting them to a safe area through the explosion relief valve 14 on the external exhaust line 12, the waste heat boiler 15, and the spark extinguishing silencer 16. When the gas engine malfunctions, the gas pressure in the exhaust pipe rises sharply and reaches the opening pressure of the explosion relief valve 14. When the explosion relief valve 14 automatically opens the explosion relief port 1401 to release the pressure in the exhaust pipe, the explosion relief valve 14 automatically returns to the closed state after the pressure is released.

[0037] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for protecting the intake and exhaust systems of a gas engine, characterized in that, include: An air intake ventilation method, wherein the air intake ventilation method is implemented by an air intake ventilation system, which is used to purge leaked gas from the gas pipeline to a safe area and to discharge combustible gas remaining in the gas pipeline; A nitrogen purging method, wherein the nitrogen purging method is implemented by a nitrogen purging system, which is used to purge combustible gas in a gas pipeline and fill the pipeline with nitrogen. An exhaust ventilation method, wherein the exhaust ventilation method is implemented through an exhaust ventilation system, which is used to ventilate the exhaust system of a gas engine and remove combustible gases that may be present in the exhaust pipe; The air intake ventilation method, the nitrogen purging method, and the exhaust ventilation method can work independently or in combination. The air intake ventilation system includes: A gas supply pipeline, wherein the gas supply pipeline is connected to the air intake end of the gas engine; The first valve is installed on the gas supply pipeline and is used to control the gas supply. The second valve, one end of which is connected to the gas supply pipeline in front of the first valve; The third valve, one end of which is connected to the gas supply pipeline behind the first valve; A venting pipeline, which is connected to the outside and connected to the other end of the third valve and the other end of the second valve; A ventilation duct is sleeved outside the gas supply pipeline. A first fan is installed in the annular space formed between the ventilation duct and the gas supply pipeline. The ventilation outlet of the ventilation duct is equipped with a fireproof net. Under normal circumstances, the first valve is open, while the second and third valves are closed, supplying gas to the gas engine to ensure its normal operation. When the gas engine malfunctions, the first valve can automatically close, while the second and third valves automatically open to cut off the gas supply.

2. The method for protecting the intake and exhaust systems of a gas engine according to claim 1, characterized in that, The air intake ventilation method includes: When the gas engine is in a long-term stopped state, the first valve is closed and the second and third valves are opened to connect the gas supply pipeline to the atmosphere and discharge the combustible gas in the pipeline.

3. The method for protecting the intake and exhaust systems of a gas engine according to claim 1, characterized in that, The nitrogen purging system includes: Nitrogen cylinder, used to supply nitrogen; An intake pipe is located between the exhaust ventilation system and the intake end of the gas engine; The fourth valve is connected to the end of the air inlet pipe and the air outlet of the nitrogen tank.

4. The method for protecting the intake and exhaust systems of a gas engine according to claim 3, characterized in that, The nitrogen purging method includes: When performing maintenance on the gas engine, open the first and fourth valves, close the second and third valves, and allow nitrogen gas to enter the intake pipe from the nitrogen tank through the fourth valve, purging the combustible gas in the intake pipe and the gas supply line, and filling the line with nitrogen gas.

5. The method for protecting the intake and exhaust systems of a gas engine according to claim 3, characterized in that, The method also includes joint protection steps during the operation of the gas engine: Once the gas engine starts successfully, the first valve and the first fan are opened, and the second, third, and fourth valves are closed, so that the intake ventilation system continues to work. The ventilation capacity of the first fan is 30 air changes per hour to purge the leaked gas from the gas supply pipeline to a safe area.

6. The method for protecting the intake and exhaust systems of a gas engine according to claim 3, characterized in that, The exhaust ventilation system includes: An exhaust ventilation device is installed on an external exhaust pipe connected to the exhaust end of the gas engine for ventilation. An explosion relief valve is installed on the external exhaust pipe. A waste heat boiler is installed on the external exhaust pipe, located behind the explosion relief valve, and is used to recover waste heat from the exhaust gas. The spark extinguishing silencer is installed on the external exhaust pipe and located at the rear of the waste heat boiler. It is used to extinguish sparks and reduce noise. The exhaust ventilation device includes a second fan and a ventilation valve; the ventilation valve is located between the second fan and the external exhaust pipe and is used to regulate the air volume.

7. The method for protecting the intake and exhaust systems of a gas engine according to claim 6, characterized in that, The exhaust ventilation method includes: Turn on the second fan and ventilation valve to activate the exhaust ventilation system, ventilate the engine's exhaust system, and expel any combustible gases that may be present in the exhaust pipe.

8. The method for protecting the intake and exhaust systems of a gas engine according to claim 6, characterized in that, The method also includes safety protection steps after an emergency shutdown of the gas engine: Close the first valve to stop the air intake ventilation system from working; Open the second valve and the third valve to release the residual gas in the gas supply pipeline before the third valve to a safe area; Open the fourth valve to activate the nitrogen purging system, purge the intake pipe, and purge the residual gas in the intake pipe and the gas supply line between the engine and the third valve to a safe area through the venting line. Simultaneously, the second fan and ventilation valve are turned on to activate the exhaust ventilation system, remove any combustible gases that may be present in the exhaust pipe, and discharge them to a safe area through the explosion relief valve, waste heat boiler, and spark extinguishing silencer on the engine's external exhaust pipe.

9. The method for protecting the intake and exhaust systems of a gas engine according to claim 6, characterized in that, The explosion relief valve is equipped with an opening pressure. When the gas engine malfunctions and the gas pressure in the exhaust pipe reaches the opening pressure, the explosion relief port of the explosion relief valve automatically opens to release the pressure. After the pressure is released, the explosion relief port automatically closes.

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