Liquid-based fuel cell gasification system and control method

Abstract

The present invention relates to the technical field of liquid-based fuel cells, and specifically to a liquid-based fuel cell gasification system and control method, comprising a first combustion chamber for heating diesel and a second combustion chamber for heating water. Diesel in a fuel tank is passed into the first combustion chamber, and a first burner and a second burner for burning the fuel are respectively arranged in the first combustion chamber and the second combustion chamber. Both the first burner and the second burner use the diesel in the fuel tank as fuel. High-temperature flue gas generated by the combustion of diesel in the two burners exchanges heat with the diesel and water passing through the two combustion chambers. The present invention significantly reduces the energy consumption of hydrogen production by reforming diesel and reduces the difficulty of hydrogen production by reforming.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid-based fuel cells, and in particular to a liquid-based fuel cell gasification system and a control method. Background Art

[0002] Diesel is a secondary energy source, primarily used in heavy-duty or truck-hauling vehicles. Traditional high-efficiency diesel engines only have an energy conversion efficiency of around 30%. Diesel reforming hydrogen production technology converts diesel into syngas in situ, which is then directly converted into electricity through a solid oxide fuel cell (SOFC), achieving an energy conversion efficiency exceeding 50%. Currently, diesel has become a key hydrogen source in the SOFC field. SOFCs based on diesel reforming hydrogen production have broad application prospects in distributed power generation applications such as ship propulsion, field camps, and emergency power supplies.

[0003] The initial process for hydrogen production from diesel reforming involves gasifying diesel and deionized water to produce stable diesel vapor and water vapor, respectively, which meet specific requirements. After thorough mixing, the reforming reaction proceeds to produce syngas. Compared to other fuel reforming methods, hydrogen production from diesel reforming presents the following difficulties: 1. Diesel is a complex, multi-carbon hydrocarbon mixture, and its reforming often requires a high water-to-carbon ratio (up to 20:1), thus requiring more evaporated water. 2. Diesel has a high boiling point at atmospheric pressure (300-400°C), requiring a high-quality heat source for its gasification. 3. Diesel reforming is more susceptible to carbon deposition and relies more heavily on a stable and precisely regulated flow rate of both diesel and water vapor. 4. Because diesel vapor is typically hotter than its ignition point, air should be avoided in the post-gasification diesel vapor pipeline to ensure safe gasification. 5. Water vapor has a temperature (less than 200°C) much lower than diesel vapor and a much higher flow rate than diesel vapor. Direct mixing of diesel and water vapor can lead to recondensation, disrupting the gasification process. Therefore, diesel reforming to produce hydrogen is different from conventional natural gas reforming to produce hydrogen. It is more difficult and consumes huge amounts of energy, so it needs to be solved urgently. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, the present invention provides a liquid-based fuel cell gasification system that significantly reduces the energy consumption and difficulty of hydrogen production from diesel reforming.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A liquid-based fuel cell gasification system includes a first combustion chamber for heating diesel and a second combustion chamber for heating water. Diesel in a fuel tank is passed into the first combustion chamber. A first burner and a second burner are respectively arranged in the first combustion chamber and the second combustion chamber for burning the fuel. The first burner and the second burner both use the diesel in the fuel tank as fuel. The high-temperature flue gas generated by the combustion of the diesel in the two burners exchanges heat with the diesel and water passing through the two combustion chambers.

[0007] The exhaust medium from the first combustion chamber and the second combustion chamber is respectively introduced into the first buffer tank and the second buffer tank, which are used to separate gas and liquid. The separated steam in the two buffer tanks is introduced into the mixing module for injection mixing. The separated diesel liquid in the first buffer tank is re-transported into the fuel tank, and the separated water in the second buffer tank is re-transported into the deionized water tank.

[0008] The separated water vapor in the second buffer tank passes through the water vapor preheater and then enters the mixing module. The exhaust flue gas from the first combustion chamber and the second combustion chamber both flows into the water vapor preheater to exchange heat with the separated water vapor leaving the second buffer tank.

[0009] As a further solution of the present invention: a diesel steam flow meter and a diesel steam regulating valve are installed at the diesel steam outlet of the first buffer tank, and a water steam flow meter and a water steam regulating valve are provided at the water steam outlet of the second buffer tank. The diesel steam flow meter, the diesel steam regulating valve, the water steam flow meter and the water steam regulating valve are all connected to the control module; a temperature sensor and a pressure sensor are installed at the diesel steam outlet of the first buffer tank and the water steam outlet of the water steam preheater.

[0010] As a further solution of the present invention: the deionized water tank is connected to the medium inlet of the second combustion chamber through a deionized water delivery pipeline, a fourth delivery pump for delivering deionized water is provided on the deionized water delivery pipeline, and a flow meter is installed at the medium inlet of the second combustion chamber; the deionized water delivery pipeline is also connected to the deionized water tank through a deionized water return pipe for deionized water reflux, and a regulating valve is provided on the deionized water return pipe.

[0011] As a further solution of the present invention: the first buffer tank and the second buffer tank are both provided with a temperature sensor, a pressure sensor and a liquid level gauge; and a nitrogen purge module is also provided on the connecting pipeline between the first buffer tank and the medium outlet.

[0012] As a further solution of the present invention: the oil tank is connected to the medium inlet of the first combustion chamber through a medium delivery pipeline, a third delivery pump is installed on the medium delivery pipeline, and a flow meter is installed at the medium inlet of the first combustion chamber; the medium delivery pipeline is also connected to the oil tank through a medium return pipe for medium reflux, and a regulating valve is provided on the medium return pipe.

[0013] As a further solution of the present invention: the fuel tank supplies diesel fuel to the first burner and the second burner through two fuel delivery pipelines, and the two fuel delivery pipelines are respectively provided with a first delivery pump and a second delivery pump for delivering diesel. Flow meters are provided at the inlets of the first burner and the second burner. The two fuel delivery pipelines are also connected to the fuel tank through a fuel return pipeline for diesel fuel reflux, and both fuel return pipelines are provided with regulating valves to adjust the fuel reflux amount.

[0014] As a further solution of the present invention: a flue gas channel is axially opened in the first combustion chamber, and the two ends of the flue gas channel are respectively connected to the flue gas inlet and the flue gas outlet of the first combustion chamber; a spiral tube for conveying diesel medium is axially arranged in the flue gas channel, and the two ends of the spiral tube are respectively connected to the medium inlet and the medium outlet, and the diesel medium exchanges heat with the high-temperature flue gas in the flue gas channel when passing through the spiral tube; the second combustion chamber has the same structure as the first combustion chamber.

[0015] As a further solution of the present invention, the medium in the two combustion chambers exchanges heat with the high-temperature flue gas in countercurrent.

[0016] A control method for a liquid-based fuel cell gasification system comprises the following steps:

[0017] S1, read the volume flow rate M of diesel vapor through the control module 柴 To set the reference evaporation volume flow rate M of water 水 ,

[0018]

[0019]

[0020] Among them, N 柴 is the molar mass of diesel;

[0021] N 水 is the molar mass of water;

[0022] n is the number of carbon atoms in the diesel molecule;

[0023] λ is the water-carbon ratio,

[0024] θ is the base water-carbon ratio, which is determined by the catalyst used in diesel reforming to produce hydrogen;

[0025] ρ(P 柴 ,T 柴 ) is the diesel vapor density, which is determined by looking up the values ​​measured by the temperature of the first buffer tank and the pressure sensor;

[0026] ρ(P 水 ,T 水) is the water vapor density, which is determined by looking up the table based on the temperature of the second buffer tank and the values ​​measured by the pressure sensor;

[0027] S2, when the water vapor flow rate is lower than M 水 When the water vapor regulating valve opening is increased, the diesel steam regulating valve opening is reduced to ensure that the reforming catalyst does not deposit carbon;

[0028] When the water vapor flow rate is higher than 105% M 水 When , reduce the opening of the water vapor regulating valve;

[0029] When the water vapor flow rate is 105% M 水 and M 水 When the opening of the water vapor regulating valve and the diesel steam regulating valve remains unchanged;

[0030] S3, measure diesel vapor temperature through temperature sensor and pressure sensor Diesel vapor pressure Water vapor temperature and water vapor pressure

[0031] when When , it indicates that the outlet steam temperature of the steam preheater has reached the appropriate range;

[0032] when When the fuel is discharged, the delivery flow of the first delivery pump and the second delivery pump is increased and the opening of the regulating valves on the two fuel return lines is reduced;

[0033] Among them, T s，柴 for The corresponding diesel vapor saturation temperature.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention uses diesel, a high calorific value liquid fuel, as the burner fuel, so that the gasified diesel vapor and water vapor fully utilize the high-grade energy released by diesel combustion, greatly reducing the energy consumption of diesel reforming to produce hydrogen and reducing the difficulty of reforming to produce hydrogen.

[0036] 2. The diesel and water of the present invention pass through the multi-layer spiral tubes and exchange heat with the flue gas in the flue gas channel in a countercurrent manner. On the one hand, the swirl enhancement effect is utilized, and on the other hand, the heat radiated by the flue gas outside the tube and the heat radiated by the combustion chamber wall can be fully absorbed, thereby achieving efficient evaporation of the medium.

[0037] 3. The present invention adds a buffer tank at the medium outlet of the combustion chamber, and separates the gas phase medium and the liquid phase medium through the gas-liquid separator in the buffer tank, thereby ensuring a stable supply of pure gas phase medium; by setting a flow meter and a regulating valve at the outlet of the buffer tank, and introducing a method for controlling the flow of diesel vapor and water vapor in different working stages of the SOFC stack, precise adjustment of the medium after gasification and before mixing is ensured, which not only avoids carbon deposition and deactivation of the catalyst in the process of diesel reforming to produce hydrogen, but also reduces the energy used to evaporate water and heat it to the reaction temperature, thereby reducing energy consumption.

[0038] 4. The arrangement of the nitrogen purge module of the present invention avoids the spontaneous combustion of diesel vapor and ensures the safety of the diesel gasification process; the high-temperature flue gas discharged from the two combustion chambers is also fully utilized and passed into the steam preheater for heat exchange with water vapor, so that the heated and vaporized water vapor is exchanged to a temperature range close to that of the diesel vapor, avoiding the recondensation of diesel vapor caused by direct mixing of diesel vapor and water vapor; the entire system realizes efficient and stable gasification of diesel and water, improves the cogeneration efficiency and reliability of the diesel SOFC system to a certain extent, and is conducive to promoting the development and application of SOFC technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention.

[0040] Figure 2 It is a structural schematic diagram of the first combustion chamber in the present invention.

[0041] In the picture:

[0042] 1. First combustion chamber; 11. First burner; 12. Medium inlet;

[0043] 13. Medium outlet; 14. Smoke inlet; 15. Smoke outlet; 16. Spiral tube;

[0044] 2. First buffer tank; 21. Nitrogen purge module;

[0045] 3. Steam preheater; 4. Mixing module; 5. Control module;

[0046] 6. Fuel tank; 61. First delivery pump; 62. Second delivery pump; 63. Third delivery pump;

[0047] 7. Second combustion chamber; 71. Second burner;

[0048] 8. Deionized water tank; 81. Fourth delivery pump; 9. Second buffer tank. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] See also Figures 1-2 In one embodiment of the present invention, a liquid-based fuel cell gasification system includes a first combustion chamber 1 and a second combustion chamber 7 of identical structure. A flue gas passage is axially defined within the first combustion chamber 1, with a flue gas inlet 14 and a flue gas outlet 15 at either end. The first combustion chamber 1 is mounted at the flue gas inlet 14, which ignites diesel fuel to generate high-temperature flue gas. A spiral tube 16 is coaxially disposed within the flue gas passage for the spiral passage of a medium, such as water or diesel fuel.

[0051] A medium inlet 12 and a medium outlet 13 are provided on the side wall of the first combustion chamber 1 so as to be connected to both ends of the spiral tube 16 respectively. The medium inlet 12 is located below the medium outlet 13, and the flue gas inlet 14 is located above the flue gas outlet 15, so that the medium can exchange heat with the high-temperature flue gas in countercurrent when passing through the spiral tube 16.

[0052] The fuel supply outlet of the fuel tank 6 is split into two fuel delivery pipelines, which are connected to the first burner 11 and the second burner 71, respectively, to provide diesel fuel to the two burners. The two fuel delivery pipelines are respectively equipped with a first delivery pump 61 and a second delivery pump 62 to deliver diesel. Flow meters are installed at the inlets of the first burner 11 and the second burner 71. Both fuel delivery pipelines are connected to the fuel tank 6 through a fuel return pipeline to allow diesel fuel to flow back into the fuel tank 6. The interface between the fuel return pipeline and the fuel delivery pipeline is located between the corresponding delivery pump and the flow meter at the burner inlet. Both fuel return pipelines are equipped with regulating valves to adjust the amount of fuel returned.

[0053] A medium delivery pipeline is also provided on the fuel tank 6 and communicates with the medium inlet 12 of the first combustion chamber 1. A third delivery pump 63 is provided on the medium delivery pipeline to deliver diesel medium. A flow meter is installed at the medium inlet 12 of the first combustion chamber 1. A medium return pipe is also provided on the medium delivery pipeline and communicates with the medium return port of the fuel tank 6 through the medium return pipe for diesel return. A regulating valve is provided on the medium return pipe to adjust the return flow rate.

[0054] The deionized water tank 8 is connected to the medium inlet of the second combustion chamber 7 via a deionized water delivery pipeline. A fourth delivery pump 81 is provided on the deionized water delivery pipeline for delivering deionized water. A flow meter is installed at the medium inlet of the second combustion chamber 7. A deionized water return pipe is also connected to the deionized water delivery pipeline and is connected to the deionized water tank 8 via the deionized water return pipe for recirculation of deionized water. The interface between the deionized water delivery pipeline and the deionized water return pipe is located between the fourth delivery pump 81 and the flow meter at the inlet of the second combustion chamber 7. A regulating valve is provided on the deionized water return pipe to control the amount of return flow.

[0055] The deionized water in the deionized water tank 8 passes through the second combustion chamber 7 and exchanges heat with the high-temperature flue gas before being passed to the second buffer tank 9 for gas-liquid separation. The separated water flows back to the deionized water tank 8, and the separated water vapor is passed to the steam preheater 3.

[0056] After the diesel passes through the first combustion chamber 1 and exchanges heat with the high-temperature flue gas, it is passed to the first buffer tank 2 for gas-liquid separation. The separated diesel flows back into the fuel tank 6, and the separated diesel vapor passes into the first buffer tank 2. The first buffer tank 2 and the second buffer tank 9 are both provided with temperature sensors, pressure sensors and liquid level sensors. A nitrogen purge module 21 is also provided on the connecting pipeline between the first buffer tank 2 and the medium outlet 13 to prevent the diesel vapor from spontaneous combustion. The liquid outlet of the buffer tank is provided with an electromagnetic valve. When the liquid level of the buffer tank is lower than the buffer tank inlet, the electromagnetic valve is closed; when the liquid level of the buffer tank is higher than the buffer tank inlet, the electromagnetic valve is opened, and the buffer tank automatically discharges liquid into the corresponding oil tank or water tank.

[0057] The high-temperature flue gas from the first combustion chamber 1 and the second combustion chamber 7 is passed into the steam preheater 3, where the steam is heated through heat exchange. The heated steam leaves the steam preheater 3 and enters the mixing module 4. The diesel vapor leaves the first buffer tank 2 and enters the mixing module 4, where the steam and diesel vapor are ejected and mixed.

[0058] A diesel steam flow meter and a diesel steam regulating valve are installed at the diesel steam outlet of the first buffer tank 2, and a water steam flow meter and a water steam regulating valve are installed at the water steam outlet of the second buffer tank 9. The diesel steam flow meter, the diesel steam regulating valve, the water steam flow meter and the water steam regulating valve are all connected to the control module 5.

[0059] Temperature sensors and pressure sensors are installed at the diesel steam outlet of the first buffer tank 2 and the steam outlet of the steam preheater 3 to detect the steam temperature and steam pressure in real time.

[0060] A control method for a liquid-based fuel cell gasification system comprises the following steps:

[0061] S1, through the control module 5 by reading the volume flow M of diesel vapor 柴 To set the reference evaporation volume flow rate M of water 水 ,

[0062]

[0063]

[0064] Among them, N 柴 is the molar mass of diesel;

[0065] N 水 is the molar mass of water;

[0066] n is the number of carbon atoms in the diesel molecule;

[0067] λ is the water-carbon ratio,

[0068] θ is the base water-carbon ratio, which is determined by the catalyst used in diesel reforming to produce hydrogen;

[0069] ρ(P 柴 ,T 柴 ) is the diesel vapor density, which is determined by looking up the values ​​measured by the temperature and pressure sensor of the first buffer tank 2;

[0070] ρ(P 水 ,T 水 ) is the water vapor density, which is determined by looking up the table based on the temperature of the second buffer tank 9 and the measured values ​​of the pressure sensor.

[0071] S2, when the water vapor flow rate is lower than M 水 When the water vapor regulating valve opening is increased, the diesel steam regulating valve opening is reduced to ensure that the reforming catalyst does not deposit carbon;

[0072] When the water vapor flow rate is higher than 105% M 水 When , reduce the opening of the water vapor regulating valve;

[0073] When the water vapor flow rate is 105% M 水 and M 水 The openings of the water vapor regulating valve and the diesel steam regulating valve remain unchanged.

[0074] S3, measure diesel vapor temperature through temperature sensor and pressure sensor Diesel vapor pressure Water vapor temperature and water vapor pressure

[0075] when When , it indicates that the outlet steam temperature of the steam preheater 3 has reached the appropriate range;

[0076] when When the fuel flow rate of the first delivery pump 61 and the second delivery pump 62 is increased, the opening of the regulating valves on the two fuel return lines is reduced;

[0077] Among them, T s，柴 for The corresponding diesel vapor saturation temperature.

[0078] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0079] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

Claims

1. A liquid-based fuel cell gasification system, characterized in that: The invention comprises a first combustion chamber (1) for heating diesel and a second combustion chamber (7) for heating water. Diesel in a fuel tank (6) is introduced into the first combustion chamber (1). A first burner (11) and a second burner (71) for burning fuel are respectively arranged in the first combustion chamber (1) and the second combustion chamber (7). The first burner (11) and the second burner (71) both use the diesel in the fuel tank (6) as fuel. High-temperature flue gas generated by the combustion of diesel in the two burners exchanges heat with the diesel and water passing through the two combustion chambers. The exhaust medium of the first combustion chamber (1) and the second combustion chamber (7) is respectively introduced into the first buffer tank (2) and the second buffer tank (9), which are used to separate gas and liquid; the separated steam in the two buffer tanks is introduced into the mixing module (4) for injection mixing; the separated diesel liquid in the first buffer tank (2) is re-transported into the oil tank (6), and the separated water in the second buffer tank (9) is re-transported into the deionized water tank (8); The separated water vapor in the second buffer tank (9) passes through the water vapor preheater (3) and then enters the mixing module (4). The exhaust flue gas from the first combustion chamber (1) and the second combustion chamber (7) both flows into the water vapor preheater (3) to exchange heat with the separated water vapor leaving the second buffer tank (9).

2. A liquid-based fuel cell gasification system according to claim 1, characterized in that: A diesel steam flow meter and a diesel steam regulating valve are installed at the diesel steam outlet of the first buffer tank (2); a water steam flow meter and a water steam regulating valve are installed at the water steam outlet of the second buffer tank (9); the diesel steam flow meter, the diesel steam regulating valve, the water steam flow meter and the water steam regulating valve are all connected to the control module (5); a temperature sensor and a pressure sensor are installed at the diesel steam outlet of the first buffer tank (2) and the water steam outlet of the water steam preheater (3).

3. A liquid-based fuel cell gasification system according to claim 2, characterized in that: The deionized water tank (8) is connected to the medium inlet of the second combustion chamber (7) through a deionized water delivery pipeline. A fourth delivery pump (81) for delivering deionized water is provided on the deionized water delivery pipeline. A flow meter is installed at the medium inlet of the second combustion chamber (7). The deionized water delivery pipeline is also connected to the deionized water tank (8) through a deionized water return pipe for reflux of deionized water. A regulating valve is provided on the deionized water return pipe.

4. A liquid-based fuel cell gasification system according to claim 2, characterized in that: The first buffer tank (2) and the second buffer tank (9) are both provided with a temperature sensor, a pressure sensor and a liquid level gauge; a nitrogen purge module (21) is also provided on the connecting pipeline between the first buffer tank (2) and the medium outlet (13).

5. A liquid-based fuel cell gasification system according to any one of claims 1 to 4, characterized in that: The oil tank (6) is connected to the medium inlet (12) of the first combustion chamber (1) through a medium delivery pipeline, a third delivery pump (63) is installed on the medium delivery pipeline, and a flow meter is installed at the medium inlet (12) of the first combustion chamber (1); the medium delivery pipeline is also connected to the oil tank (6) through a medium return pipe for medium reflux, and a regulating valve is provided on the medium return pipe.

6. A liquid-based fuel cell gasification system according to any one of claims 1 to 4, characterized in that: The fuel tank (6) supplies diesel fuel to the first burner (11) and the second burner (71) through two fuel delivery pipelines. The two fuel delivery pipelines are respectively provided with a first delivery pump (61) and a second delivery pump (62) for delivering diesel. Flow meters are provided at the inlets of the first burner (11) and the second burner (71). The two fuel delivery pipelines are also connected to the fuel tank (6) through a fuel return pipeline for diesel fuel return. The two fuel return pipelines are both provided with regulating valves for regulating the fuel return amount.

7. A liquid-based fuel cell gasification system according to any one of claims 1 to 4, characterized in that: A flue gas passage is provided in the first combustion chamber (1) along the axial direction, with both ends of the flue gas passage being respectively connected to the flue gas inlet (14) and the flue gas outlet (15) of the first combustion chamber (1). A spiral tube (16) for conveying diesel medium is arranged in the axial direction in the flue gas passage, with both ends of the spiral tube (16) being respectively connected to the medium inlet (12) and the medium outlet (13). When the diesel medium passes through the spiral tube (16), it exchanges heat with the high-temperature flue gas in the flue gas passage. The second combustion chamber (7) has the same structure as the first combustion chamber (1).

8. The liquid-based fuel cell gasification system according to claim 7, characterized in that: The medium in the two combustion chambers exchanges heat with the high-temperature flue gas in countercurrent.

9. The control method of a liquid-based fuel cell gasification system according to any one of claims 2 to 4, characterized in that: The steps include: S1, through the control module (5) by reading the volume flow rate M of diesel vapor 柴 To set the reference evaporation volume flow rate M of water 水 , Among them, N 柴 is the molar mass of diesel; N 水 is the molar mass of water; n is the number of carbon atoms in the diesel molecule; λ is the water-carbon ratio, θ is the base water-carbon ratio, which is determined by the catalyst used in diesel reforming to produce hydrogen; ρ(P 柴 ,T 柴 ) is the diesel vapor density, which is determined by looking up the values ​​measured by the temperature of the first buffer tank (2) and the pressure sensor; ρ(P 水 ,T 水 ) is the water vapor density, which is determined by looking up the values ​​measured by the temperature of the second buffer tank (9) and the pressure sensor; S2, when the water vapor flow rate is lower than M 水 When the water vapor regulating valve opening is increased, the diesel steam regulating valve opening is reduced to ensure that the reforming catalyst does not deposit carbon; When the water vapor flow rate is higher than 105% M 水 When , reduce the opening of the water vapor regulating valve; When the water vapor flow rate is 105% M 水 and M 水 When the opening of the water vapor regulating valve and the diesel steam regulating valve remains unchanged; S3, measure diesel vapor temperature through temperature sensor and pressure sensor Diesel vapor pressure Water vapor temperature and water vapor pressure when When , it indicates that the outlet steam temperature of the steam preheater (3) has reached the appropriate range; when When the fuel is in the fuel supply state, the delivery flow rates of the first delivery pump (61) and the second delivery pump (62) are increased and the openings of the regulating valves on the two fuel return lines are reduced; Among them, T s，柴 for The corresponding diesel vapor saturation temperature.

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