Safe and stable submerged combustion gasifier

Abstract

The utility model discloses a safe and stable submerged combustion type gasifier which comprises a water bath pool, a heat exchange tube bundle and a lower gas channel are arranged in the water bath pool, one end of the heat exchange tube bundle is connected with an LNG feeding pipeline, the other end of the heat exchange tube bundle is connected with a natural gas output pipeline, the top of the lower gas channel is connected with a hearth, and the hearth is connected with a fuel gas pipeline. A first emergency cut-off valve, a second emergency cut-off valve and a flow control valve are sequentially arranged on the fuel gas pipeline in the fuel gas flowing direction, and a pressure relief unit is connected to the fuel gas pipeline and located between the first emergency cut-off valve and the second emergency cut-off valve. A standby gas source unit is connected to the fuel gas pipeline and located between the pressure relief unit and the second emergency cut-off valve. The problem that a combustor of an existing gasifier is abnormally extinguished due to insufficient fuel gas pressure is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gasifier technical field, concretely relates to safe and stable submerged combustion gasifier. BACKGROUND

[0002] Submerged combustion gasifier principle: liquefied natural gas (LNG) is delivered to safe and stable submerged combustion gasifier by booster pump, and the gasified natural gas enters city long -distance pipe network or town gas pipe network.Submerged combustion gasifier is generally composed of burner (furnace), lower airway, pipe bundle heat exchanger, downcomer and injection pipe, combustion air fan, instrument control system, fuel gas is completely combusted into combustion gas under the action of sufficient combustion air in burner, combustion gas becomes small bubbles into water through the small hole on the upper surface of injection pipe, makes water produce high turbulence, LNG in pipe bundle and highly turbulent water outside pipe fully exchange heat, small bubbles and pipe wall contact each other to heat LNG in pipe bundle, and at the same time, waste water produced by the whole system is discharged to sewage pipe network.

[0003] Among them, the burner of safe and stable submerged combustion gasifier provides sufficient heat for stable combustion, which is the most core process of liquefied natural gas gasification, the pressure of fuel gas is about 0.6 MPag, and the flow rate of fuel gas corresponds to the combustion heat generated by the burner, which is automatically controlled by temperature control loop so as to keep bath water temperature at about 30 DEG C, and the total volume of combustion air delivered to the burner by fan is fixed by butterfly valve according to the performance curve of air blower.The fuel gas of existing safe and stable submerged combustion gasifier is designed as single source, when fuel gas pressure is insufficient, the burner will be extinguished abnormally, at this time, low temperature LNG in LNG heat exchange pipe bundle in gasifier is easy to enter long-distance pipe network or downstream equipment and facilities (downstream design is generally ordinary carbon steel material, not low temperature steel material) to cause pipe low temperature brittle fracture and natural gas explosion accident. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing safe and stable submerged combustion gasifier, and solves the problem of burner abnormal extinguishing caused by insufficient fuel gas pressure of existing gasifier.

[0005] The utility model discloses a technical scheme adopted is safe and stable submerged combustion gasifier, including water bath pool, be provided with heat exchange tube bundle, lower air channel in water bath pool, one end of heat exchange tube bundle is connected with LNG feed pipeline, and the other end of heat exchange tube bundle is connected with natural gas export pipeline, and the top of lower air channel is connected with hearth, and the hearth is connected with fuel gas pipeline, and first emergency stop valve, second emergency stop valve, flow control valve are sequentially provided on fuel gas pipeline according to fuel gas flow direction, and relief unit is connected on fuel gas pipeline and between first emergency stop valve, second emergency stop valve, and spare gas source unit is connected on fuel gas pipeline and between relief unit and second emergency stop valve.

[0006] The utility model discloses a technical scheme adopted is safe and stable submerged combustion gasifier, including water bath pool, be provided with heat exchange tube bundle, lower air channel in water bath pool, one end of heat exchange tube bundle is connected with LNG feed pipeline, and the other end of heat exchange tube bundle is connected with natural gas export pipeline, and the top of lower air channel is connected with hearth, and the hearth is connected with fuel gas pipeline, and first emergency stop valve, second emergency stop valve, flow control valve are sequentially provided on fuel gas pipeline according to fuel gas flow direction, and relief unit is connected on fuel gas pipeline and between first emergency stop valve, second emergency stop valve, and spare gas source unit is connected on fuel gas pipeline and between relief unit and second emergency stop valve.

[0007] Pressure gauge is provided on fuel gas pipeline and is located the inlet side of first emergency stop valve.

[0008] Flowmeter is provided on fuel gas pipeline and is located the outlet side of flow control valve.

[0009] Thermometer is provided on fuel gas pipeline and is located the side of flowmeter away from flow control valve.

[0010] Fan is connected with hearth.

[0011] Spare gas source unit includes spare fuel gas pipeline, and the spare fuel gas pipeline is arranged between relief unit and second emergency stop valve, and third emergency stop valve, temperature control valve are sequentially provided on spare fuel gas pipeline according to fuel gas flow direction, and first controller is connected with temperature control valve signal, and first controller is connected with second controller, and first temperature sensor is connected with first controller, and first temperature sensor is arranged in hearth, and second temperature sensor is connected with second controller, and second temperature sensor is arranged in water bath pool.

[0012] Bottom of water bath pool is connected with production wastewater discharge pipeline, and discharge valve is arranged on production wastewater discharge pipeline.

[0013] The utility model discloses a technical scheme adopted is safe and stable submerged combustion gasifier through setting up spare gas source unit, can carry out gas source guarantee, can guarantee the temperature in water bath pool constant simultaneously, thereby avoided the abnormal extinguishing of combustor due to the fuel gas pressure deficiency and took place. ACCURACY OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of safe and stable submerged combustion gasifier of the utility model.

[0015] In the diagram, 1. Fuel gas pipeline, 2. Backup fuel gas pipeline, 3. Pressure relief pipeline, 4. Blower, 5. Refined water pipeline, 6. Natural gas export pipeline, 7. LNG feed pipeline, 8. Furnace, 9. Water bath, 10. Exhaust valve, 11. Lower gas duct, 12. Heat exchanger tube bundle, 13. Chimney, 14. Production wastewater discharge pipeline, 15. First emergency shut-off valve, 16. Second emergency shut-off valve, 17. Third emergency shut-off valve, 18. Pressure relief and venting valve, 19. First valve, 20. Temperature control valve, 21. Flow control valve, 22. Pressure gauge, 23. Flow meter, 24. Thermometer, 25. Second valve, 26. First controller, 27. Second controller. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] This utility model relates to a safe and stable submerged combustion gasifier, the structure of which is as follows: Figure 1 As shown, the system includes a water bath 9, within which a heat exchange tube bundle 12 and a lower gas duct 11 are installed. The water bath 9 is connected to a refined water pipeline 5, which is equipped with a valve. Water is supplied to the water bath 9 through the water pipe. The heat exchange tube bundle 12 and the lower gas duct 11 are both immersed in water. One end of the heat exchange tube bundle 12 is connected to an LNG feed pipeline 7, and the other end is connected to a natural gas export pipeline 6. Liquefied natural gas (LNG) is pressurized and enters the LNG feed pipeline 7, then the heat exchange tube bundle 12. The top of the lower gas duct 11 is connected to a furnace 8, which is connected to a blower 4. A first valve 19 is installed on the pipeline connecting the blower 4 and the furnace 8. Air is supplied to the furnace 8 according to the air-fuel ratio, so that the furnace 8 can burn stably. Heat is supplied to the water bath 9 through the lower gas duct 11. After the liquefied natural gas is fully heat-exchanged through the heat exchange tube bundle 12 and the water bath 9, it becomes gaseous natural gas and enters the natural gas export pipeline 6 for export. The furnace 8 is connected to the fuel gas pipeline 1. The fuel gas pipeline 1 is equipped with a first emergency shut-off valve 15, a second emergency shut-off valve 16 and a flow control valve 21 in sequence according to the fuel gas flow direction. A pressure relief unit is connected to the fuel gas pipeline 1 between the first emergency shut-off valve 15 and the second emergency shut-off valve 16. A backup gas source unit is connected to the fuel gas pipeline 1 between the pressure relief unit and the second emergency shut-off valve 16.

[0019] Example 2

[0020] This utility model relates to a safe and stable submerged combustion gasifier, the structure of which is as follows: Figure 1As shown, including water bath 9, water bath 9 is provided with heat exchange tube bundle 12, lower airway 11, water bath 9 is connected with water pipe, water pipe is provided with valve, through water pipe fills into water in water bath 9, heat exchange tube bundle 12, lower airway 11 are all immersed in water, one end of heat exchange tube bundle 12 is connected with LNG feed line 7, the other end of heat exchange tube bundle 12 is connected with natural gas export pipeline 6, liquefied natural gas (LNG) is entered LNG feed line 7 by pressurization, then enters heat exchange tube bundle 12, the top of lower airway 11 is connected with furnace 8, furnace 8 is connected with fan 4, air is provided to furnace 8 according to air-fuel ratio by fan 4, makes furnace 8 stable combustion and provides heat to water bath 9 through lower airway 11, liquefied natural gas becomes gaseous natural gas after sufficient heat exchange through heat exchange tube bundle 12 and water bath 9 and enters natural gas export pipeline 6 for export, furnace 8 is connected with fuel gas pipeline 1, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 are sequentially arranged on fuel gas pipeline 1 according to fuel gas flow direction, pressure relief unit is connected on fuel gas pipeline 1 and between first emergency shut-off valve 15, second emergency shut-off valve 16, spare gas source unit is connected on fuel gas pipeline 1 and between pressure relief unit and second emergency shut-off valve 16.

[0021] Pressure relief unit includes pressure relief pipeline 3, pressure relief pipeline 3 is provided with pressure relief vent valve 18, pressure relief pipeline 3 is connected with fuel gas pipeline 1, when failure occurs, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21, i.e. the valve in spare gas source unit are all closed, pressure relief vent valve 18 is opened to carry out pressure relief and venting.

[0022] Example 3

[0023] The utility model discloses safe and stable immersion combustion gasifier, structure is as Figure 1As shown, including water bath 9, water bath 9 is provided with heat exchange tube bundle 12, lower airway 11, water bath 9 is connected with water pipe, water pipe is provided with valve, through water pipe fills into water in water bath 9, heat exchange tube bundle 12, lower airway 11 are all immersed in water, one end of heat exchange tube bundle 12 is connected with LNG feed pipeline 7, the other end of heat exchange tube bundle 12 is connected with natural gas export pipeline 6, liquefied natural gas (LNG) is entered LNG feed pipeline 7 by pressurization, then enters heat exchange tube bundle 12, the top of lower airway 11 is connected with hearth 8, hearth 8 is connected with fan 4, air is provided to hearth 8 according to air-fuel ratio by fan 4, makes hearth 8 stable combustion and provides heat to water bath 9 through lower airway 11, liquefied natural gas becomes gaseous natural gas after sufficient heat exchange through heat exchange tube bundle 12 and water bath 9 and enters natural gas export pipeline 6 and exports, hearth 8 is connected with fuel gas pipeline 1, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 are sequentially arranged on fuel gas pipeline 1 according to fuel gas flow direction, pressure relief unit is connected between first emergency shut-off valve 15 and second emergency shut-off valve 16 on fuel gas pipeline 1, and backup gas source unit is connected between pressure relief unit and second emergency shut-off valve 16 on fuel gas pipeline 1.

[0024] Pressure relief unit includes pressure relief pipeline 3, pressure relief pipeline 3 is provided with pressure relief vent valve 18, pressure relief pipeline 3 is connected with fuel gas pipeline 1, when failure occurs, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 and the valve in backup gas source unit are all closed, and pressure relief vent valve 18 is opened to release pressure and vent.

[0025] Pressure gauge 22 is arranged on fuel gas pipeline 1 and located at the inlet side of first emergency shut-off valve 15, and pressure gauge 22 is used for monitoring the pressure in fuel gas pipeline 1, flowmeter 23 is arranged on fuel gas pipeline 1 and located at the outlet side of flow control valve 21, and flowmeter 23 is used for monitoring the flow of fuel gas in fuel gas pipeline 1, when the monitored pressure and flow fluctuate and are unstable, first emergency shut-off valve 15, pressure relief vent valve 18 are closed, and backup gas source unit is started.

[0026] Example 4

[0027] The utility model discloses safe and stable immersion combustion type gasifier, structure is as Figure 1As shown, including water bath 9, water bath 9 is provided with heat exchange tube bundle 12, lower airway 11, water bath 9 is connected with water pipe, water pipe is provided with valve, through water pipe fills into water in water bath 9, heat exchange tube bundle 12, lower airway 11 are immersed in water, one end of heat exchange tube bundle 12 is connected with LNG feed line 7, the other end of heat exchange tube bundle 12 is connected with natural gas export pipeline 6, liquefied natural gas (LNG) is entered LNG feed line 7 by pressurization, then enters heat exchange tube bundle 12, the top of lower airway 11 is connected with hearth 8, hearth 8 is connected with fan 4, air is provided to hearth 8 according to air-fuel ratio by fan 4, makes hearth 8 stable combustion and provides heat to water bath 9 through lower airway 11, liquefied natural gas becomes gaseous natural gas after sufficient heat exchange through heat exchange tube bundle 12 and water bath 9 and enters natural gas export pipeline 6 and exports, hearth 8 is connected with fuel gas pipeline 1, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 are sequentially arranged on fuel gas pipeline 1 according to fuel gas flow direction, pressure relief unit is connected between first emergency shut-off valve 15 and second emergency shut-off valve 16 on fuel gas pipeline 1, and backup gas source unit is connected between pressure relief unit and second emergency shut-off valve 16 on fuel gas pipeline 1.

[0028] Pressure relief unit includes pressure relief pipeline 3, pressure relief pipeline 3 is connected with fuel gas pipeline 1, and pressure relief vent valve 18 is arranged on pressure relief pipeline 3, when failure occurs, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 and the valves in backup gas source unit are all closed, and pressure relief vent valve 18 is opened to release pressure and vent.

[0029] Pressure gauge 22 is arranged on fuel gas pipeline 1 and located at the inlet side of first emergency shut-off valve 15, and pressure gauge 22 is used for monitoring the pressure in fuel gas pipeline 1, flow meter 23 is arranged on fuel gas pipeline 1 and located at the outlet side of flow control valve 21, and flow meter 23 is used for monitoring the flow of fuel gas in fuel gas pipeline 1, when the monitored pressure and flow fluctuate and are unstable, first emergency shut-off valve 15, pressure relief vent valve 18 are closed, and backup gas source unit is started.

[0030] Temperature meter 24 is arranged on fuel gas pipeline 1 and located at the side away from flow control valve 21 of flow meter 23, and temperature meter 24 is used for monitoring the temperature in fuel gas pipeline 1.

[0031] Example 5

[0032] The utility model discloses safe and stable immersion combustion type gasifier, the structure is as Figure 1As shown, including water bath 9, water bath 9 is provided with heat exchange tube bundle 12, lower airway 11, water bath 9 is connected with water pipe, water pipe is provided with valve, water is filled into water bath 9 through water pipe, heat exchange tube bundle 12, lower airway 11 are immersed in water, one end of heat exchange tube bundle 12 is connected with LNG feed line 7, the other end of heat exchange tube bundle 12 is connected with natural gas export pipeline 6, liquefied natural gas (LNG) enters LNG feed line 7 by pressurization, then enters heat exchange tube bundle 12, the top of lower airway 11 is connected with hearth 8, hearth 8 is connected with fan 4, air is provided to hearth 8 according to air-fuel ratio through fan 4, so that hearth 8 stably burns to provide heat to water bath 9 through lower airway 11, liquefied natural gas becomes gaseous natural gas after sufficient heat exchange through heat exchange tube bundle 12 and water bath 9, and then enters natural gas export pipeline 6 for export, hearth 8 is connected with fuel gas pipeline 1, first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 are sequentially arranged on fuel gas pipeline 1 according to the flow direction of fuel gas, pressure relief unit is connected on fuel gas pipeline 1 and between first emergency shut-off valve 15 and second emergency shut-off valve 16, and backup gas source unit is connected on fuel gas pipeline 1 and between pressure relief unit and second emergency shut-off valve 16.

[0033] The pressure relief unit includes pressure relief pipeline 3, pressure relief vent valve 18 is arranged on pressure relief pipeline 3, pressure relief pipeline 3 is connected with fuel gas pipeline 1, when failure occurs, the valves in first emergency shut-off valve 15, second emergency shut-off valve 16, flow control valve 21 and backup gas source unit are all closed, and pressure relief vent valve 18 is opened to perform pressure relief and venting.

[0034] Pressure gauge 22 is arranged on fuel gas pipeline 1 and located on the inlet side of first emergency shut-off valve 15, pressure gauge 22 is used for monitoring the pressure in fuel gas pipeline 1, flow meter 23 is arranged on fuel gas pipeline 1 and located on the outlet side of flow control valve 21, flow meter 23 is used for monitoring the flow of fuel gas in fuel gas pipeline 1, when the monitored pressure and flow fluctuate and are unstable, first emergency shut-off valve 15 and pressure relief vent valve 18 are closed, and backup gas source unit is started.

[0035] Temperature gauge 24 is arranged on fuel gas pipeline 1 and located on the side away from flow control valve 21 of flow meter 23, and is used for monitoring the temperature in fuel gas pipeline 1.

[0036] The bottom of water bath 9 is connected with production wastewater discharge pipeline 14, a valve is arranged on production wastewater discharge pipeline 14, when wastewater needs to be discharged, the valve is opened, so that the wastewater in water bath 9 can be discharged in time, and when the wastewater is discharged to a specified liquid level, the valve is closed, so that the water in water bath 9 is prevented from being lost.

[0037] Example 6

[0038] This utility model relates to a safe and stable submerged combustion gasifier, the structure of which is as follows: Figure 1 As shown, the system includes a water bath 9, within which a heat exchange tube bundle 12 and a lower gas duct 11 are installed. A chimney 13 is installed on the top of the water bath 9. The water bath 9 is connected to a water pipe with a valve, through which water is filled into the water bath 9. The heat exchange tube bundle 12 and the lower gas duct 11 are both immersed in water. One end of the heat exchange tube bundle 12 is connected to an LNG feed line 7, which is equipped with a second valve 25. The other end of the heat exchange tube bundle 12 is connected to a natural gas export pipeline 6. Liquefied natural gas (LNG) is pressurized and enters the LNG feed line 7, then enters the heat exchange tube bundle 12. The top of the lower gas duct 11 is connected to a furnace 8, which is connected to a blower 4. Air is supplied to the furnace 8 according to the air-fuel ratio, so that the furnace 8 can burn stably. Heat is supplied to the water bath 9 through the lower gas duct 11. After the liquefied natural gas is fully heat-exchanged through the heat exchange tube bundle 12 and the water bath 9, it becomes gaseous natural gas and enters the natural gas export pipeline 6 for export. The furnace 8 is connected to the fuel gas pipeline 1. The fuel gas pipeline 1 is equipped with a first emergency shut-off valve 15, a second emergency shut-off valve 16 and a flow control valve 21 in sequence according to the fuel gas flow direction. A pressure relief unit is connected to the fuel gas pipeline 1 between the first emergency shut-off valve 15 and the second emergency shut-off valve 16. A backup gas source unit is connected to the fuel gas pipeline 1 between the pressure relief unit and the second emergency shut-off valve 16.

[0039] The pressure relief unit includes a pressure relief pipeline 3, which is equipped with a pressure relief venting valve 18. The pressure relief pipeline 3 is connected to the fuel gas pipeline 1. When a fault occurs, the first emergency shut-off valve 15, the second emergency shut-off valve 16, the flow control valve 21, and the valves in the backup gas source unit are all closed, and the pressure relief venting valve 18 is opened to relieve pressure and vent.

[0040] A pressure gauge 22 is installed on the fuel gas pipeline 1 at the inlet side of the first emergency shut-off valve 15. The pressure gauge 22 is used to monitor the pressure in the fuel gas pipeline 1. A flow meter 23 is installed on the fuel gas pipeline 1 at the outlet side of the flow control valve 21. The flow meter 23 is used to monitor the flow rate of fuel gas in the fuel gas pipeline 1. When the monitored pressure and flow rate fluctuate or become unstable, the first emergency shut-off valve 15 and the pressure relief and venting valve 18 are closed, and the backup gas source unit is activated.

[0041] A thermometer 24 is installed on the fuel gas pipeline 1 and on the side of the flow meter 23 away from the flow control valve 21 to monitor the temperature inside the fuel gas pipeline 1.

[0042] The bottom of the water bath 9 is connected with a production wastewater discharge pipeline 14, and an exhaust valve 10 is arranged on the production wastewater discharge pipeline 14. When it is necessary to discharge wastewater, the wastewater in the water bath 9 can be discharged in time after the valve is opened. When the wastewater is discharged to a specified liquid level, the valve is closed to prevent the water in the water bath 9 from being lost.

[0043] The standby gas source unit comprises a standby fuel gas pipeline 2 arranged between the pressure relief unit and the second emergency shut-off valve 16. The third emergency shut-off valve 17 and the temperature control valve 20 are arranged on the standby fuel gas pipeline 2 in sequence according to the fuel gas flow direction. The temperature control valve 20 is signal-connected with the first controller 26. The first controller 26 is connected with the second controller 27. The first controller 26 is connected with the first temperature sensor arranged in the hearth 8. The first temperature sensor is used to collect the temperature of the hearth 8. The second controller 27 is connected with the second temperature sensor arranged in the water bath 9. The second temperature sensor is used to collect the temperature of the water in the water bath 9. The fuel gas input into the standby fuel gas pipeline 2 and the fuel gas input into the fuel gas pipeline 1 adopt different gas sources, and the fuel gas supply pressure in the standby fuel gas pipeline 2 meets the process requirement of 0.6 Mpa, so as to effectively meet the maximum load operation of the hearth 8.

[0044] The working process of the safe and stable submerged combustion gasifier is as follows: under normal production conditions, the first emergency shut-off valve 15, the second emergency shut-off valve 16 and the flow control valve 21 are opened, the pressure relief vent valve 18, the third emergency shut-off valve 17 and the temperature control valve 20 are closed, fuel gas enters the furnace 8 through the fuel gas pipeline 1 and provides air to the furnace 8 according to the air-fuel ratio through the fan 4, so that the furnace 8 stably burns and provides heat to the water bath 9 through the lower air duct 11, liquefied natural gas (LNG) enters the LNG feed pipeline 7 through pressurization, then enters the heat exchange tube bundle 12, and after full heat exchange through the heat exchange tube bundle 12 and the water bath 9, becomes gaseous natural gas and enters the natural gas external pipeline 6 for external transmission; when the upstream gas source pressure and flow of the fuel gas pipeline 1 are unstable (i.e. the fuel gas supply in the fuel gas pipeline 1 is insufficient), in order to meet the uninterrupted gas supply demand of natural gas peak regulation in winter, the first emergency shut-off valve 15 is closed, the third emergency shut-off valve 17 and the temperature control valve 20 are opened, the standby gas source unit is started, and the remaining valves remain in the state under normal production conditions; at this time, the pressure or heavy component of the fuel gas changes, the temperature of the furnace 8 changes, the temperature of the furnace 8 is collected by the first temperature sensor and fed back to the first controller 26, the change of the temperature of the furnace 8 makes the first controller 26 work, controls the opening of the temperature control valve 20, changes the addition amount of fuel, so that the temperature deviation of the furnace 8 is reduced, at the same time, due to the change of the temperature of the furnace 8, or due to the change of the inlet flow or temperature of the fuel gas, the temperature of the water bath 9 changes, the temperature of the water bath 9 is collected by the second temperature sensor and fed back to the second controller 27, the change of the temperature of the water bath 9 constantly changes the given value of the first controller 26 through the second controller 27, so that the first controller 26 and the second controller 27 work together until the temperature of the water bath 9 is stabilized at the given value, the transition process is completed, and the temperature of the water bath 9 is constant, so that the abnormal extinguishing of the burner when the fuel gas pressure is insufficient is avoided.

Claims

1. A safe and stable submerged combustion gasifier characterized by, The application relates to a natural gas production device, which comprises a water bath (9), a heat exchange pipe bundle (12) arranged in the water bath (9), a lower air channel (11), an LNG feeding pipeline (7) connected to one end of the heat exchange pipe bundle (12), a natural gas delivery pipeline (6) connected to the other end of the heat exchange pipe bundle (12), a furnace (8) connected to the top of the lower air channel (11), a fuel gas pipeline (1) connected to the furnace (8), a first emergency cut-off valve (15), a second emergency cut-off valve (16) and a flow control valve (21) arranged on the fuel gas pipeline (1) in sequence according to the fuel gas flow direction, a pressure relief unit connected to the fuel gas pipeline (1) and located between the first emergency cut-off valve (15) and the second emergency cut-off valve (16), and a standby gas source unit connected to the fuel gas pipeline (1) and located between the pressure relief unit and the second emergency cut-off valve (16).

2. The safe and stable, submerged combustion gasifier of claim 1, wherein, The pressure relief unit comprises a pressure relief pipeline (3) provided with a pressure relief vent valve (18) and connected to the fuel gas pipeline (1).

3. The safe and stable, submerged combustion gasifier of claim 1 wherein, A pressure gauge (22) is arranged on the fuel gas pipeline (1) and located on the inlet side of the first emergency cut-off valve (15).

4. The safe and stable, submerged combustion gasifier of claim 1 wherein, A flow meter (23) is arranged on the fuel gas pipeline (1) and located on the outlet side of the flow control valve (21).

5. The safe and stable, submerged combustion gasifier of claim 1 wherein, A temperature gauge (24) is arranged on the fuel gas pipeline (1) and located on the side of the flow meter (23) away from the flow control valve (21).

6. The safe and stable, submerged combustion gasifier of claim 1 wherein, The furnace (8) is connected to a fan (4).

7. The safe and stable, submerged combustion gasifier of claim 1 wherein, The standby gas source unit comprises a standby fuel gas pipeline (2) arranged between the pressure relief unit and the second emergency cut-off valve (16), a third emergency cut-off valve (17) and a temperature control valve (20) arranged on the standby fuel gas pipeline (2) in sequence according to the fuel gas flow direction, a first controller (26) signal-connected to the temperature control valve (20), a second controller (27) connected to the first controller (26), a first temperature sensor connected to the first controller (26) and arranged in the furnace (8), and a second temperature sensor connected to the second controller (27) and arranged in the water bath (9).

8. The safe and stable, submerged combustion gasifier of claim 1 wherein, The bottom of the water bath (9) is connected to a production wastewater discharge pipeline (14) provided with a discharge valve (10).

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