Multi-fuel combustion device

Abstract

The utility model provides a multi-fuel combustion device. The multi-fuel combustion device comprises a combustor, a liquid fuel pipeline, a liquefied gas pipeline, a natural gas pipeline, an air pipeline and an atomization pipeline, the liquid fuel pipeline conveys fuel oil or an organic solvent to the combustor; the liquid fuel pipeline is at least sequentially provided with a filter, a first pressure reducing valve, a first hydraulic pressure gauge and a first control valve from the inlet end to the outlet end; a first barometer, a second pressure reducing valve, a third electromagnetic valve and a mixer are at least sequentially arranged on the liquefied gas pipeline from the inlet end to the outlet end, and the mixer is connected with the air pipeline through a first mixing pipeline; the natural gas pipeline is at least sequentially provided with a third pressure reducing valve, a proportional valve and a gas flow limiting valve from the inlet end to the outlet end, and the proportional valve is connected with the air pipeline through a second mixing pipeline; the air pipeline is at least sequentially provided with a fifth barometer and a second control valve from the inlet end to the outlet end; and the atomization pipeline is connected between the fifth barometer and the second control valve and is communicated with an air pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of combustion devices, and particularly relates to a multi-fuel combustion device. Background Art

[0002] RTO (Regenerative Thermal Oxidizer) is an efficient organic waste gas treatment device. Its working principle is to heat the organic waste gas to 760 - 850 °C so that the VOCs in the waste gas are oxidized and decomposed into harmless CO2 and H2O. The fuel selection of the burner of RTO has an important impact on the operating cost and efficiency. Traditional burners usually use diesel or natural gas as fuel. However, with the optimized utilization of resources, organic solvents, especially alcohol fuels, have become an economical and effective alternative fuel. These solvents usually come from by-products in the chemical production process. Although their direct economic value is not high, when used as fuel, they can significantly reduce the dependence on external energy and reduce the cost generated by energy consumption.

[0003] Therefore, it is necessary to provide a multi-fuel combustion device that enables multiple fuels including organic solvents to be used as the burner fuel. Summary of the Utility Model

[0004] The utility model provides a multi-fuel combustion device that can use multiple fuels including organic solvents.

[0005] To achieve the above object, the utility model provides the following technical solutions.

[0006] A multi-fuel combustion device includes a burner and a liquid fuel pipeline, a liquefied gas pipeline, a natural gas pipeline, an air pipeline, and an atomization pipeline respectively connected to the burner; the liquid fuel pipeline transports fuel oil or organic solvent to the burner; a liquid flow limiting valve is provided at the port where the burner is connected to the liquid fuel pipeline; at least a filter, a first pressure reducing valve, a first hydraulic pressure gauge, and a first control valve are sequentially arranged on the liquid fuel pipeline from the inlet end to the outlet end; at least a first air pressure gauge, a second pressure reducing valve, a third solenoid valve, and a mixer are sequentially arranged on the liquefied gas pipeline from the inlet end to the outlet end, and the mixer is connected to the air pipeline through a first mixing pipeline; at least a third pressure reducing valve, a proportional valve, and a gas flow limiting valve are sequentially arranged on the natural gas pipeline from the inlet end to the outlet end, and the proportional valve is connected to the air pipeline through a second mixing pipeline; at least a fifth air pressure gauge and a second control valve are sequentially arranged on the air pipeline from the inlet end to the outlet end; the atomization pipeline is connected between the fifth air pressure gauge and the second control valve to communicate with the air pipeline, and when the liquid fuel pipeline transports organic solvent to the burner, the atomization pipeline transports atomized air to the burner.

[0007] Optionally, a first low-pressure switch, a first solenoid valve, a second solenoid valve, a first high-pressure switch, and a second hydraulic pressure gauge are sequentially arranged between the first pressure reducing valve and the first control valve; the first hydraulic pressure gauge is arranged between the first low-pressure switch and the first solenoid valve, the first hydraulic pressure gauge displays the pressure in front of the first solenoid valve, and the second hydraulic pressure gauge displays the pressure after the second solenoid valve; the first low-pressure switch is electrically connected to the first solenoid valve and controls the opening of the first solenoid valve when the pressure detected by the first low-pressure switch is greater than a set first low-pressure value; the first high-pressure switch is electrically connected to the second solenoid valve and controls the opening of the second solenoid valve when the pressure detected by the first high-pressure switch is less than a set first high-pressure value, and the first high-pressure value is greater than the first low-pressure value, so that the pressure of the liquid fuel pipeline is maintained between the first high-pressure value and the first low-pressure value.

[0008] Optionally, a fourth solenoid valve is arranged between the third solenoid valve and the mixer, and a second air pressure gauge is arranged between the second pressure reducing valve and the third solenoid valve; the first air pressure gauge displays the pressure in front of the second pressure reducing valve, and the second air pressure gauge displays the pressure between the third solenoid valve and the pressure reducing valve; a fourth maintenance valve is arranged between the first air pressure gauge and the second pressure reducing valve, and a fifth maintenance valve is arranged between the fourth solenoid valve and the mixer.

[0009] Optionally, the first mixing pipeline is connected between the fifth air pressure gauge and the second control valve to communicate with the air pipeline, and a first butterfly valve is arranged on the first mixing pipeline, and the first butterfly valve controls the on-off of the first mixing pipeline.

[0010] Optionally, a second low-pressure switch, a fifth solenoid valve, a sixth solenoid valve, and a second high-pressure switch are sequentially arranged between the third pressure reducing valve and the proportional valve; the second low-pressure switch and the second high-pressure switch are respectively connected with a third air pressure gauge and a fourth air pressure gauge, the third air pressure gauge displays the pressure of the second low-pressure switch, and the fourth air pressure gauge displays the pressure of the second high-pressure switch; the second low-pressure switch is electrically connected to the fifth solenoid valve and controls the opening of the fifth solenoid valve when the pressure detected by the second low-pressure switch is greater than a set second low-pressure value; the second high-pressure switch is electrically connected to the sixth solenoid valve and controls the opening of the sixth solenoid valve when the pressure detected by the second high-pressure switch is less than a set second high-pressure value, and the second high-pressure value is greater than the second low-pressure value, so that the pressure of the natural gas pipeline is maintained between the second high-pressure value and the second low-pressure value.

[0011] Optionally, a third low-pressure switch is provided between the fifth solenoid valve and the sixth solenoid valve. The third low-pressure switch is electrically connected to the sixth solenoid valve. When the pressure detected by the third low-pressure switch is greater than a set third low-pressure value, the sixth solenoid valve is controlled to close. The second high-pressure value is greater than the third low-pressure value, so that the pressure in the liquid fuel pipeline is maintained between the second high-pressure value and the third low-pressure value.

[0012] Optionally, a third butterfly valve is provided at the rear section of the second control valve on the air pipeline. The second mixing pipeline is connected between the third butterfly valve and the second control valve to communicate the air pipeline. The air flow rate delivered to the proportional valve is controlled by controlling the third butterfly valve and the second control valve, thereby controlling the mixing ratio of air and natural gas; a fourth low-pressure switch is provided between the fifth pressure gauge and the second control valve. The fourth low-pressure switch is electrically connected to the second control valve.

[0013] Optionally, a second butterfly valve is provided on the atomization pipeline. The second butterfly valve controls the on-off of the atomization pipeline.

[0014] Optionally, a communicating pipeline is provided at the inlet end of the liquefied gas pipeline and the inlet end of the natural gas pipeline, and a manual valve is provided on the communicating pipeline.

[0015] Optionally, a first maintenance valve, a second maintenance valve, and a third maintenance valve are respectively provided at the inlet ends of the liquid fuel pipeline, the liquefied gas pipeline, and the natural gas pipeline.

[0016] Compared with the prior art, the technical solution of the embodiment of the present utility model has beneficial effects.

[0017] The present utility model is provided with a liquid fuel pipeline, a liquefied gas pipeline, a natural gas pipeline, an air pipeline, and an atomization pipeline respectively connected to a burner. The liquid fuel pipeline transports fuel oil or organic solvent to the burner. The atomization pipeline communicates with the air pipeline. When the liquid fuel pipeline transports organic solvent to the burner, the atomization pipeline transports atomized air to the burner, so that the atomized air and the organic solvent are fully mixed and burned in the burner 100; a mixer is provided on the liquefied gas pipeline. The mixer is connected to the air pipeline through a first mixing pipeline, so that air and liquefied gas are mixed in the mixer and then transported to the burner for full combustion; a proportional valve is provided on the natural gas pipeline. The proportional valve is connected to the air pipeline through a second mixing pipeline and can adjust the mixing ratio of natural gas and air, so that air and natural gas are mixed through the proportional valve and then transported to the burner for full combustion; ensuring the combustion efficiency of various fuels and the stability of the flame; being able to flexibly use organic solvents, fuel oil, liquefied gas, and natural gas as fuel sources, and allowing organic solvents and fuel oil to share the same set of transport pipelines, which is convenient for use and maintenance.

[0018] Furthermore, pressure switches are provided on each pipeline, and the pipeline pressure is controlled through the linkage of the pressure switches and the valves, so that the pressure in the pipeline is stable.

[0019] Furthermore, a maintenance valve is provided on the pipeline, which is beneficial for subsequent maintenance. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a multi-fuel combustion device in an embodiment of the present utility model.

[0021] Description of the Reference Numerals:

[0022] Burner; 110, liquid flow limiting valve;

[0023] Liquid fuel pipeline; 201, filter; 202, first pressure reducing valve; 203, first hydraulic pressure gauge; 204, first control valve; 205, first low-pressure switch; 206, first solenoid valve; 207, second solenoid valve; 208, first high-pressure switch; 209, second hydraulic pressure gauge; 210, first maintenance valve;

[0024] Liquefied gas pipeline; 301, first air pressure gauge; 302, second pressure reducing valve; 303, third solenoid valve; 304, mixer; 305, fourth solenoid valve; 306, second air pressure gauge; 307, fourth maintenance valve; 308, fifth maintenance valve; 309, second maintenance valve; 320, first mixing pipeline; 321, first butterfly valve;

[0025] Natural gas pipeline; 401, third pressure reducing valve; 402, proportional valve; 403, gas flow limiting valve; 404, second low-pressure switch; 405, fifth solenoid valve; 406, sixth solenoid valve; 407, second high-pressure switch; 408, third air pressure gauge; 409, fourth air pressure gauge; 410, third low-pressure switch; 411, third maintenance valve; 420, second mixing pipeline;

[0026] Air pipeline; 501, fifth air pressure gauge; 502, second control valve; 503, third butterfly valve; 504, fourth low-pressure switch;

[0027] Atomization pipeline; 601, second butterfly valve;

[0028] 700, connecting pipeline; 701, manual valve. Detailed Embodiment

[0029] To make the objectives, features, and beneficial effects of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It can be understood that the specific embodiments described below are only for explaining the present utility model and are not intended to limit the present utility model. Also, in the figures, the same or similar reference numerals may be used to refer to the same or similar elements in different embodiments, and the description of the same or similar elements in different embodiments and the description of the elements, features, effects, etc. of the prior art may be omitted.

[0030] Referring to Figure 1 , an embodiment of the present utility model provides a multi-fuel combustion device.

[0031] Specifically, the multi-fuel combustion device includes a burner 100 and a liquid fuel pipeline 200, a liquefied gas pipeline 300, a natural gas pipeline 400, an air pipeline 500, and an atomization pipeline 600 that are respectively connected to the burner 100; the liquid fuel pipeline 200 conveys fuel oil or organic solvents to the burner 100; a liquid flow limiting valve 110 is provided at the port where the burner 100 is connected to the liquid fuel pipeline 200; at least a filter 201, a first pressure reducing valve 202, a first hydraulic pressure gauge 203, and a first control valve 204 are sequentially arranged on the liquid fuel pipeline 200 from the inlet end to the outlet end; at least a first air pressure gauge 301, a second pressure reducing valve 302, a third solenoid valve 303, and a mixer 304 are sequentially arranged on the liquefied gas pipeline 300 from the inlet end to the outlet end, and the mixer 304 is connected to the air pipeline 500 through a first mixing pipeline 320; at least a third pressure reducing valve 401, a proportional valve 402, and a gas flow limiting valve 403 are sequentially arranged on the natural gas pipeline 400 from the inlet end to the outlet end, and the proportional valve 402 is connected to the air pipeline 500 through a second mixing pipeline 420; at least a fifth air pressure gauge 501 and a second control valve 502 are sequentially arranged on the air pipeline 500 from the inlet end to the outlet end; the atomization pipeline 600 is connected to the air pipeline 500 between the fifth air pressure gauge 501 and the second control valve 502, and when the liquid fuel pipeline 200 conveys organic solvents to the burner 100, the atomization pipeline 600 conveys atomized air to the burner 100.

[0032] In a specific implementation, the liquid fuel pipeline 200, the liquefied gas pipeline 300, the natural gas pipeline 400, the air pipeline 500, and the atomization pipeline 600 are respectively connected to the burner 100 through metal hoses.

[0033] In some embodiments, a first low-pressure switch 205, a first solenoid valve 206, a second solenoid valve 207, a first high-pressure switch 208, and a second hydraulic pressure gauge 209 are sequentially arranged between the first pressure reducing valve 202 and the first control valve 204; the first hydraulic pressure gauge 203 is arranged between the first low-pressure switch 205 and the first solenoid valve 206, the first hydraulic pressure gauge 203 shows the pressure in the front section of the first solenoid valve 206, and the second hydraulic pressure gauge 209 shows the pressure in the rear section of the second solenoid valve 207; the first low-pressure switch 205 is electrically connected to the first solenoid valve 206, and controls the first solenoid valve 206 to open when the pressure detected by the first low-pressure switch 205 is greater than the set first low-pressure value; the first high-pressure switch 208 is electrically connected to the second solenoid valve 207, and controls the second solenoid valve 207 to open when the pressure detected by the first high-pressure switch 208 is less than the set first high-pressure value, and the first high-pressure value is greater than the first low-pressure value, so that the pressure in the liquid fuel pipeline 200 is maintained between the first high-pressure value and the first low-pressure value.

[0034] In some embodiments, a fourth solenoid valve 305 is arranged between the third solenoid valve 303 and the mixer 304, and a second air pressure gauge 306 is arranged between the second pressure reducing valve 302 and the third solenoid valve 303; the first air pressure gauge 301 shows the pressure in the front section of the second pressure reducing valve 302, and the second air pressure gauge 306 shows the pressure between the third solenoid valve 303 and the pressure reducing valve 302; a fourth maintenance valve 307 is arranged between the first air pressure gauge 301 and the second pressure reducing valve 302, and a fifth maintenance valve 308 is arranged between the fourth solenoid valve 305 and the mixer 304; both the fourth maintenance valve 307 and the fifth maintenance valve 308 are manual ball valves.

[0035] In some embodiments, the first mixing pipeline 320 is connected to communicate with the air pipeline 500 between the fifth air pressure gauge 501 and the second control valve 502, and a first butterfly valve 321 is arranged on the first mixing pipeline 320, and the first butterfly valve 321 controls the on-off of the first mixing pipeline 320.

[0036] In some embodiments, a second low-pressure switch 404, a fifth solenoid valve 405, a sixth solenoid valve 406, and a second high-pressure switch 407 are sequentially arranged between the third pressure reducing valve 401 and the proportional valve 402; a third pressure gauge 408 and a fourth pressure gauge 409 are respectively connected to the second low-pressure switch 404 and the second high-pressure switch 407, the third pressure gauge 408 displays the pressure of the second low-pressure switch 404, and the fourth pressure gauge 409 displays the pressure of the second high-pressure switch 407; the second low-pressure switch 404 is electrically connected to the fifth solenoid valve 405 and controls the fifth solenoid valve 405 to open when the pressure detected by the second low-pressure switch 404 is greater than the set second low-pressure value; the second high-pressure switch 407 is electrically connected to the sixth solenoid valve 406 and controls the sixth solenoid valve 406 to open when the pressure detected by the second high-pressure switch 407 is less than the set second high-pressure value. The second high-pressure value is greater than the second low-pressure value, so that the pressure of the natural gas pipeline 400 is maintained between the second high-pressure value and the second low-pressure value, the natural gas pressure control is stable, and the control method is simple.

[0037] In some embodiments, a third low-pressure switch 410 is arranged between the fifth solenoid valve 405 and the sixth solenoid valve 406. The third low-pressure switch 410 is electrically connected to the sixth solenoid valve 406 and controls the sixth solenoid valve 406 to close when the pressure detected by the third low-pressure switch 410 is greater than the set third low-pressure value. The second high-pressure value is greater than the third low-pressure value, so that the pressure of the natural gas pipeline 400 is maintained between the second high-pressure value and the third low-pressure value. By adjusting the set pressure value, the natural gas pressure control is made more accurate.

[0038] In some embodiments, a third butterfly valve 503 is arranged on the air pipeline 500 at the rear section of the second control valve 502. The second mixing pipeline 420 is connected to communicate with the air pipeline 500 between the third butterfly valve 503 and the second control valve 502. The air flow rate delivered to the proportional valve 402 is controlled by controlling the third butterfly valve 503 and the second control valve 502, thereby controlling the mixing ratio of air and natural gas; a fourth low-pressure switch 504 is arranged between the fifth pressure gauge 501 and the second control valve 502, and the fourth low-pressure switch 504 is electrically connected to the second control valve 502.

[0039] In some embodiments, a second butterfly valve 601 is arranged on the atomization pipeline 600, and the second butterfly valve 601 controls the on-off of the atomization pipeline 600.

[0040] In some embodiments, a connecting pipeline 700 is provided at the inlet ends of the liquefied gas pipeline 300 and the natural gas pipeline 400. A manual valve 701 is provided on the connecting pipeline 700. When natural gas is used as the fuel, the fuel is supplied to the burner 100 through the natural gas pipeline 400. At this time, the natural gas pipeline 400 is connected to the liquefied gas pipeline 300 through the connecting pipeline 700. The purpose of this is to take out some of the gas generated at the inlet end of the liquefied gas through the natural gas pipeline 400 to avoid leakage and waste of the liquefied gas.

[0041] In some embodiments, a first maintenance valve 210, a second maintenance valve 309 and a third maintenance valve 411 are respectively provided at the inlet ends of the liquid fuel pipeline 200, the liquefied gas pipeline 300 and the natural gas pipeline 400; the first maintenance valve 210, the second maintenance valve 309 and the third maintenance valve 411 are all manual ball valves.

[0042] In summary, for the multi-fuel combustion device of the embodiment of the present utility model, a liquid fuel pipeline 200, a liquefied gas pipeline 300, a natural gas pipeline 400, an air pipeline 500 and an atomizing pipeline 600 are respectively connected to the burner 100. The liquid fuel pipeline 200 transports fuel oil or organic solvent to the burner 100. The atomizing pipeline 600 is communicated with the air pipeline 500. When the liquid fuel pipeline 200 transports the organic solvent to the burner 100, the atomizing pipeline 600 transports atomized air to the burner 100, so that the atomized air and the organic solvent are fully mixed and burned in the burner 100; a mixer 304 is provided on the liquefied gas pipeline 300. The mixer 304 is connected to the air pipeline 500 through a first mixing pipeline 320, so that air and liquefied gas are mixed in the mixer 304 and then transported to the burner 100 for full combustion; the natural gas pipeline 400 is provided with a proportional valve 402. The proportional valve 402 is connected to the air pipeline 500 through a second mixing pipeline 420 and can adjust the mixing ratio of natural gas and air, so that air and natural gas are mixed through the proportional valve 402 and then transported to the burner 100 for full combustion; ensuring the combustion efficiency of various fuels and the stability of the flame; being able to flexibly use organic solvents, fuel oil, liquefied gas and natural gas as fuel sources, and allowing organic solvents and fuel oil to share the same set of transport pipelines, which is convenient for use and maintenance.

[0043] Further, pressure switches are provided on each pipeline of the present utility model to control the pipeline pressure through the linkage of the pressure switches and the valves, so that the pressure in the pipeline is stable.

[0044] Further, maintenance valves are provided on the pipelines of the present utility model, which is beneficial to subsequent maintenance.

[0045] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure of the present utility model, even when a single embodiment is described only with respect to a specific feature. The feature examples provided in the disclosure of the present utility model are intended to be illustrative rather than restrictive, unless otherwise stated. In specific implementations, according to actual needs and where technically feasible, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, and the technical features from the corresponding independent claims may be combined in any appropriate manner rather than only through the specific combinations recited in the claims.

Claims

1. A multi-fuel combustion device, characterized in that: The invention comprises a burner and a liquid fuel pipeline, a liquefied gas pipeline, a natural gas pipeline, an air pipeline and an atomization pipeline respectively connected to the burner; the liquid fuel pipeline transports fuel oil or an organic solvent to the burner; a liquid flow limiting valve is arranged at the port where the burner is connected to the liquid fuel pipeline; at least a filter, a first pressure reducing valve, a first hydraulic gauge and a first control valve are arranged in sequence from the inlet end to the outlet end on the liquid fuel pipeline; at least a first pressure gauge, a second pressure reducing valve, a third solenoid valve and a mixer are arranged in sequence from the inlet end to the outlet end on the liquefied gas pipeline. The mixer is connected to the air pipeline via a first mixing pipeline; the natural gas pipeline is provided with at least a third pressure reducing valve, a proportional valve and a gas flow limiting valve in sequence from the inlet end to the outlet end, and the proportional valve is connected to the air pipeline via a second mixing pipeline; the air pipeline is provided with at least a fifth pressure gauge and a second control valve in sequence from the inlet end to the outlet end; the atomization pipeline is connected to the air pipeline between the fifth pressure gauge and the second control valve, and when the liquid fuel pipeline transports the organic solvent to the burner, the atomization pipeline transports atomizing air to the burner.

2. The multi-fuel combustion device according to claim 1, characterized in that: A first low-pressure switch, a first solenoid valve, a second solenoid valve, a first high-pressure switch and a second hydraulic gauge are sequentially arranged between the first pressure reducing valve and the first control valve; the first hydraulic gauge is arranged between the first low-pressure switch and the first solenoid valve, the first hydraulic gauge displays the pressure of the front section of the first solenoid valve, and the second hydraulic gauge displays the pressure of the rear section of the second solenoid valve; the first low-pressure switch is electrically connected to the first solenoid valve, and controls the first solenoid valve to open when the pressure detected by the first low-pressure switch is greater than a set first low-pressure value; the first high-pressure switch is electrically connected to the second solenoid valve, and controls the second solenoid valve to open when the pressure detected by the first high-pressure switch is less than a set first high-pressure value, and the first high-pressure value is greater than the first low-pressure value, so that the pressure of the liquid fuel pipeline is maintained between the first high-pressure value and the first low-pressure value.

3. The multi-fuel combustion device according to claim 1, characterized in that: A fourth solenoid valve is arranged between the third solenoid valve and the mixer, and a second pressure gauge is arranged between the second pressure reducing valve and the third solenoid valve; the first pressure gauge displays the pressure in the front section of the second pressure reducing valve, and the second pressure gauge displays the pressure between the third solenoid valve and the pressure reducing valve; a fourth maintenance valve is arranged between the first pressure gauge and the second pressure reducing valve, and a fifth maintenance valve is arranged between the fourth solenoid valve and the mixer.

4. The multi-fuel combustion device according to claim 1, characterized in that: The first mixing pipeline is connected to the air pipeline between the fifth pressure gauge and the second control valve, and a first butterfly valve is provided on the first mixing pipeline to control the on-off of the first mixing pipeline.

5. The multi-fuel combustion device according to claim 1, characterized in that: A second low-pressure switch, a fifth solenoid valve, a sixth solenoid valve and a second high-pressure switch are sequentially arranged between the third pressure reducing valve and the proportional valve; the second low-pressure switch and the second high-pressure switch are respectively connected to a third barometer and a fourth barometer, the third barometer displays the pressure of the second low-pressure switch, and the fourth barometer displays the pressure of the second high-pressure switch; The second low-pressure switch is electrically connected to the fifth solenoid valve, and controls the fifth solenoid valve to open when the pressure detected by the second low-pressure switch is greater than a set second low-pressure value; the second high-pressure switch is electrically connected to the sixth solenoid valve, and controls the sixth solenoid valve to open when the pressure detected by the second high-pressure switch is less than a set second high-pressure value, and the second high-pressure value is greater than the second low-pressure value, so that the pressure of the natural gas pipeline is maintained between the second high-pressure value and the second low-pressure value.

6. The multi-fuel combustion device according to claim 5, characterized in that: A third low-pressure switch is arranged between the fifth solenoid valve and the sixth solenoid valve, and the third low-pressure switch is electrically connected to the sixth solenoid valve. When the pressure detected by the third low-pressure switch is greater than a set third low-pressure value, the sixth solenoid valve is controlled to be closed, and the second high pressure is greater than the third low pressure, so that the pressure of the liquid fuel pipeline is maintained between the second high pressure and the third low pressure.

7. The multi-fuel combustion device according to claim 1, characterized in that: A third butterfly valve is provided on the air pipeline at the rear section of the second control valve, and the second mixing pipeline is connected to the air pipeline between the third butterfly valve and the second control valve. The air flow delivered to the proportional valve is controlled by controlling the third butterfly valve and the second control valve, thereby controlling the mixing ratio of air and natural gas; a fourth low-pressure switch is provided between the fifth pressure gauge and the second control valve, and the fourth low-pressure switch is electrically connected to the second control valve.

8. The multi-fuel combustion device according to claim 1, characterized in that: The atomizing pipeline is provided with a second butterfly valve, and the second butterfly valve controls the on-off of the atomizing pipeline.

9. The multi-fuel combustion device according to claim 1, characterized in that: A connecting pipeline is provided between the inlet end of the liquefied gas pipeline and the inlet end of the natural gas pipeline, and a manual valve is provided on the connecting pipeline.

10. The multi-fuel combustion device according to claim 1, characterized in that: The inlet ends of the liquid fuel pipeline, the liquefied gas pipeline and the natural gas pipeline are respectively provided with a first maintenance valve, a second maintenance valve and a third maintenance valve.

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