Hydrogen-doped mixed gas supply method for natural gas generator set

Abstract

The application discloses a hydrogen-mixed gas supply method for a natural gas generator set, and belongs to the field of gas supply for natural gas generator sets, and solves the problems of difficulty in improving the thermal efficiency of the existing generator set and high carbon emission. The method comprises the following steps: S1, air and natural gas are separately sent to a mixer for mixing; S2, the mixed gas in step S1 is pressurized and then sent to a mixing proportion valve; S3, hydrogen is added to the mixing proportion valve for mixing; and S4, the mixed gas in step S3 is sent to an engine. The hydrogen-mixed gas supply method for the natural gas generator set mixes air and natural gas, and then mixes hydrogen, so that the three kinds of gases, i.e., natural gas, hydrogen and air, are uniformly mixed, the thermal efficiency of the natural gas generator set is effectively improved, and the carbon emission is reduced.

Description

Technical Field

[0001] This invention relates to the field of natural gas generator set gas supply, and more specifically, it relates to a method for supplying natural gas generator sets with hydrogen blending. Background Technology

[0002] In recent years, with the continuous introduction of policies related to distributed energy, and the bottleneck reached in improving the thermal efficiency and air-fuel ratio of natural gas generator sets, increasing the application ratio of hydrogen energy in energy consumption can effectively reduce carbon dioxide emissions. In the process of realizing the large-scale utilization of pure hydrogen, the application of hydrogen blending with natural gas is an effective solution for the transition to pure hydrogen energy.

[0003] Internal combustion engine development data shows that hydrogen has higher reactivity than natural gas, and hydrogen burns faster. Using natural gas as the primary fuel, blended with hydrogen, allows for leaner combustion, resulting in higher NO₂ levels compared to burning hydrogen and natural gas alone. X It also has lower CO2 emissions. This not only better meets environmental protection requirements but also improves the thermal efficiency of natural gas generator sets to some extent.

[0004] The development of natural gas generator sets is currently facing a bottleneck, with difficulties in improving thermal efficiency and higher carbon emissions compared to hydrogen fuel. Therefore, there is an urgent need to design a method for blending hydrogen into natural gas generator sets for gas supply. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a method for hydrogen blending and gas supply of natural gas generator sets, which can effectively improve the thermal efficiency of natural gas generator sets and reduce carbon emissions.

[0006] To achieve the above objectives, the present invention provides a method for hydrogen blending and gas supply in a natural gas generator set, the method comprising the following steps:

[0007] S1, air and natural gas are delivered to the mixer separately in two separate streams for mixing;

[0008] S2, pressurize the mixed gas from step S1 and send it to the mixing proportioning valve;

[0009] S3, add hydrogen gas to the mixing proportioner valve for mixing;

[0010] S4, deliver the mixed gas from step S3 to the engine.

[0011] As a further improvement, step S1 includes an air supply process and a natural gas supply process, wherein,

[0012] The air supply process is as follows: air passes through the air filter and enters the mixer;

[0013] The natural gas supply process is as follows: natural gas passes through the gas filter, electromagnetic shut-off valve, flame arrester, pressure regulating valve, and gas metering valve in sequence before entering the mixer.

[0014] Furthermore, during natural gas supply, the natural gas pressure between the gas filter and the electromagnetic shut-off valve, the natural gas pressure and temperature after the pressure regulating valve, and the natural gas pressure and temperature before and after the gas metering valve are simultaneously monitored.

[0015] Furthermore, in step S3, the process of adding hydrogen to the mixing proportioning valve is as follows: after passing through the gas filter, the electromagnetic shut-off valve, and the high-pressure regulator in sequence, the hydrogen is injected into the mixing proportioning valve through the nozzle component.

[0016] Furthermore, when adding hydrogen to the mixing proportioning valve, the hydrogen pressure between the gas filter and the solenoid shut-off valve, the hydrogen pressure and temperature between the high-pressure regulator and the nozzle assembly, and the hydrogen pressure and temperature between the nozzle assembly and the mixing proportioning valve are monitored simultaneously.

[0017] Furthermore, in step 3, natural gas, air, and hydrogen are first coarsely mixed in the proportioning chamber of the mixing proportioning valve, and then the mixed gas is transported to the mixing chamber of the mixing proportioning valve for secondary fine mixing.

[0018] Furthermore, during the initial coarse mixing of natural gas, air, and hydrogen, the amount of hydrogen accounts for 5%, 15%, 30%, or 50% of the total mixed gas volume.

[0019] Furthermore, during the initial coarse mixing of natural gas, air, and hydrogen, the pressure and temperature within the proportioning chamber are monitored, and the opening size of the valve between the proportioning chamber and the mixing chamber is determined based on the monitored pressure, thereby delivering the mixed gas to the mixing chamber.

[0020] Furthermore, the secondary fine mixing of natural gas, air, and hydrogen involves introducing the mixed gas into a spiral gas channel for high-speed rotational mixing.

[0021] Furthermore, in step 4, the mixed gas in step S3 is sequentially delivered to the engine through the explosion-proof flame arrester, intercooler, and throttle valve.

[0022] Beneficial effects

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The natural gas generator set hydrogen blending method of the present invention mixes air and natural gas and then adds hydrogen for secondary coarse mixing, followed by secondary fine mixing before being delivered to the engine for combustion. This makes the three gases of natural gas, hydrogen and air more uniformly mixed, effectively improving the thermal efficiency of the natural gas generator set and reducing emissions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is an enlarged cross-sectional view of the present invention.

[0027] Among them: 1-mixer, 2-mixing proportioning valve, 3-engine, 4-air filter, 5-gas filter, 6-electromagnetic shut-off valve, 7-flame arrester, 8-pressure regulating valve, 9-gas metering valve, 10-high pressure reducing valve, 11-nozzle component, 12-explosion-proof flame arrester, 13-intercooler, 14-throttle body, 15-turbocharger, 16-manual ball valve, 17-pressure gauge, 18-pressure and temperature sensor, 19-bracket, 20-generator, 21-proportional chamber, 22-mixing chamber, 23-opening valve, 24-spiral blade. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0029] See Figure 1-2 As shown, a method for hydrogen blending and gas supply from a natural gas generator set includes the following steps:

[0030] S1, air and natural gas are delivered to mixer 1 in two separate streams for mixing;

[0031] S2, the mixed gas from step S1 is pressurized and then sent to the mixing proportioning valve 2. Specifically, the mixed gas is pressurized by the turbocharger 15.

[0032] S3, add hydrogen to the mixing proportioning valve 2 to mix and achieve hydrogen-blended combustion of natural gas;

[0033] S4, the mixed gas from step S3 is delivered to engine 3.

[0034] The natural gas generator set hydrogen blending method of the present invention mixes air and natural gas and then adds hydrogen for secondary coarse mixing, followed by secondary fine mixing before being delivered to the engine for combustion. This makes the three gases of natural gas, hydrogen and air more uniformly mixed, effectively improving the thermal efficiency of the natural gas generator set and reducing emissions.

[0035] Preferably, step S1 includes an air supply process and a natural gas supply process, wherein,

[0036] The air supply process is as follows: air passes through the air filter 4 and enters the mixer 1. Clean air helps to improve combustion efficiency.

[0037] The natural gas supply process is as follows: natural gas passes through the gas filter 5, electromagnetic shut-off valve 6, flame arrester 7, pressure regulating valve 8, and gas metering valve 9 in sequence before entering the mixer 1, thereby achieving the filtration of natural gas, opening or closing of the supply, and regulation of the natural gas volume.

[0038] During natural gas supply, the natural gas pressure between the gas filter 5 and the solenoid shut-off valve 6, the natural gas pressure and temperature after the pressure regulating valve 8, and the natural gas pressure and temperature before and after the gas metering valve 9 are monitored simultaneously. This allows the engine ECU to monitor the natural gas pressure and adjust the natural gas intake based on the target air-fuel ratio and the pressure difference and temperature before and after the gas metering valve.

[0039] Preferably, in step S3, the process of adding hydrogen to the mixing proportioning valve 2 is as follows: after passing through the gas filter 5, the electromagnetic shut-off valve 6, and the high-pressure regulator 10 in sequence, the hydrogen is sprayed into the mixing proportioning valve 2 through the nozzle component 11 to achieve the incorporation of hydrogen.

[0040] When adding hydrogen to the mixing proportioning valve 2, the hydrogen pressure between the gas filter 5 and the solenoid shut-off valve 6, the hydrogen pressure and temperature between the high-pressure regulator 10 and the nozzle component 11, and the hydrogen pressure and temperature between the nozzle component 11 and the mixing proportioning valve 2 are monitored simultaneously. This allows the engine ECU to monitor the hydrogen pressure and adjust the hydrogen intake volume according to the amount of gas and air and the set mass ratio.

[0041] Preferably, in step 3, natural gas, air and hydrogen are first coarsely mixed in the proportioning chamber 21 of the mixing proportioning valve 2, and then the mixed gas is transported to the mixing chamber 22 of the mixing proportioning valve 2 for secondary fine mixing. After two mixing processes, the mixing uniformity of the three gases is further improved, thereby improving the combustion efficiency.

[0042] Preferably, during the initial coarse mixing of natural gas, air, and hydrogen, the amount of hydrogen accounts for 5%, 15%, 30%, or 50% of the total mixed gas volume, that is, the set mass ratio of hydrogen is 5%, 15%, 30%, or 50%, which improves the thermal efficiency of the natural gas generator set.

[0043] Preferably, during the initial coarse mixing of natural gas, air, and hydrogen, the pressure and temperature within the proportioning chamber 21 are monitored. The opening size of the valve 23 between the proportioning chamber 21 and the mixing chamber 22 is adjusted based on the monitored pressure, allowing the mixed gas to be delivered to the mixing chamber 22. This ensures that the pressure and temperature within the proportioning chamber 21 remain balanced and that the mixed gas safely transitions to the mixing chamber 22. Furthermore, the secondary fine mixing of natural gas, air, and hydrogen involves introducing the mixed gas into a spiral gas channel for high-speed rotational mixing, further improving the mixing uniformity of the three gases and thus enhancing combustion efficiency.

[0044] Preferably, in step 4, the mixed gas in step S3 is sequentially delivered to the engine 3 through the explosion-proof flame arrester 12, the intercooler 13, and the throttle valve 14, so as to safely deliver the mixed gas to the engine 3 for combustion.

[0045] A hydrogen blending gas supply system for a natural gas generator set includes a hydrogen system, an air system, a natural gas system, a mixer 1, and a mixing proportioning valve 2. The air system is used to transport air, the hydrogen system is used to transport hydrogen, and the natural gas system is used to transport natural gas. Both the air system and the natural gas system are connected to the mixer 1 to transport air and natural gas to the mixer 1 for mixing. The mixer 1 is connected to the mixing proportioning valve 2 through a turbocharger 15 to transport the mixed gas in the mixer 1 to the mixing proportioning valve 2. The hydrogen system is connected to the mixing proportioning valve 2 to mix hydrogen gas. The mixing proportioning valve 2 is connected to the engine 3 through a mixing main intake system to transport the hydrogen-blended mixed gas to the engine 3 for combustion.

[0046] The natural gas generator set hydrogen blending gas supply system of the present invention mixes air and natural gas and then adds hydrogen for secondary coarse mixing, followed by secondary fine mixing before being delivered to the engine for combustion. This makes the three gases of natural gas, hydrogen and air more uniformly mixed, effectively improving the thermal efficiency of the natural gas generator set and reducing carbon emissions.

[0047] Specifically, the hydrogen system includes a manual ball valve 16, a gas filter 5, a solenoid shut-off valve 6, a high-pressure reducing valve 10, and a nozzle assembly 11 connected in sequence. The nozzle assembly 11 is connected to the mixing proportioning valve 2. The solenoid shut-off valve 6, the high-pressure reducing valve 10, and the nozzle assembly 11 are all electrically connected to the engine ECU for easy control. The hydrogen is stored in a gas tank. The manual ball valve 16 is installed on the gas tank. When the manual ball valve 16 is opened, the hydrogen can pass through the gas filter 5, the solenoid shut-off valve 6, the high-pressure reducing valve 10, and the nozzle assembly 11 into the mixing proportioning valve 2.

[0048] Preferably, a pressure gauge 17 is installed on the pipeline between the gas filter 5 and the electromagnetic shut-off valve 6 corresponding to the hydrogen system to monitor the hydrogen pressure at that location. Pressure and temperature sensors 18 are installed on the pipeline between the high-pressure reducing valve 10 and the nozzle component 11, and between the nozzle component 11 and the mixing proportioning valve 2 corresponding to the hydrogen system to monitor the hydrogen pressure and temperature at these two locations.

[0049] Specifically, the air system includes an air filter 4, which is connected to the mixer 1 and serves to filter the air.

[0050] Preferably, the air filter 4 is mounted on top of the generator 20 via a bracket 19, thus optimizing the structural layout of the natural gas generator set.

[0051] Specifically, the natural gas system includes a manual ball valve 16, a gas filter 5, a solenoid shut-off valve 6, a flame arrester 7, a pressure regulating valve 8, and a gas metering valve 9 connected in sequence. The gas metering valve 9 is connected to the mixer 1. The gas filter 5, solenoid shut-off valve 6, pressure regulating valve 8, and gas metering valve 9 are all electrically connected to the engine ECU for easy control. Natural gas is stored in a gas tank. The manual ball valve 16 is installed on the gas tank. When the manual ball valve 16 is opened, natural gas can enter the mixer 1 through the gas filter 5, solenoid shut-off valve 6, flame arrester 7, pressure regulating valve 8, and gas metering valve 9.

[0052] Preferably, a pressure gauge 17 is installed on the pipeline between the gas filter 5 and the electromagnetic shut-off valve 6 corresponding to the natural gas system to monitor the pressure at that point. Pressure and temperature sensors 18 are installed on the pipelines after the pressure regulating valve 8 and before and after the gas metering valve 9 corresponding to the natural gas system to monitor the temperature and pressure at these three points.

[0053] Specifically, the mixed intake system includes an explosion-proof flame arrester 12, an intercooler 13, and a throttle valve 14 connected in sequence. The throttle valve 14 is connected to the engine 3, and the explosion-proof flame arrester 12 is connected to the mixing proportioning valve 2, so as to safely deliver the mixed gas to the engine for combustion.

[0054] Preferably, the mixing proportioning valve 2 includes a proportioning chamber 21 and a mixing chamber 22, wherein the proportioning chamber 21 and the mixing chamber 22 are connected by an opening valve 23. The turbocharger 15 and the nozzle component 11 are both connected to the proportioning chamber 21, and the mixing chamber 22 is connected to the mixing intake system. Specifically, the mixing chamber 22 is connected to the explosion-proof flame arrester 12 of the mixing intake system. A pressure and temperature sensor 18 is provided in the proportioning chamber 21 to monitor the pressure and temperature within the proportioning chamber 21. Furthermore, a spiral blade 24 is provided in the mixing chamber 22, the outer edge of which is fitted against the inner wall of the mixing chamber 22 to form a spiral air passage, so that the mixed gas is more evenly mixed during high-speed rotation.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for supplying hydrogen-blended gas to a natural gas generator set, characterized in that, The method includes the following steps: S1, air and natural gas are delivered to mixer (1) separately in two separate streams for mixing; S2, pressurize the mixed gas from step S1 and send it to the mixing proportioning valve (2); S3, add hydrogen gas into the mixing proportioner valve (2) for mixing; S4, the mixed gas from step S3 is delivered to the engine (3); Step S1 includes an air supply process and a natural gas supply process, wherein, The air supply process is as follows: air passes through the air filter (4) and enters the mixer (1); The natural gas supply process is as follows: natural gas passes through the gas filter (5), electromagnetic shut-off valve (6), flame arrester (7), pressure regulating valve (8), and gas metering valve (9) in sequence before entering the mixer (1); During natural gas supply, the natural gas pressure between the gas filter (5) and the electromagnetic shut-off valve (6), the natural gas pressure and temperature after the pressure regulating valve (8), and the natural gas pressure and temperature before and after the gas metering valve (9) are monitored simultaneously. In step S3, the process of adding hydrogen to the mixing proportion valve (2) is as follows: after passing through the gas filter (5), electromagnetic shut-off valve (6), and high pressure regulator (10) in sequence, the hydrogen is injected into the mixing proportion valve (2) through the nozzle component (11). When adding hydrogen to the mixing proportion valve (2), the hydrogen pressure between the gas filter (5) and the electromagnetic shut-off valve (6), the hydrogen pressure and temperature between the high pressure regulator (10) and the nozzle assembly (11), and the hydrogen pressure and temperature between the nozzle assembly (11) and the mixing proportion valve (2) are monitored simultaneously. In step 3, natural gas, air and hydrogen are first coarsely mixed in the proportioning chamber (21) of the mixing proportioning valve (2), and then the mixed gas is transported to the mixing chamber (22) of the mixing proportioning valve (2) for secondary fine mixing. During the initial coarse mixing of natural gas, air, and hydrogen, the amount of hydrogen accounts for 5%, 15%, 30%, or 50% of the total mixed gas volume. In step 4, the mixed gas in step S3 is sequentially delivered to the engine (3) through the explosion-proof flame arrester (12), the intercooler (13), and the throttle valve (14).

2. The method for hydrogen blending and gas supply of a natural gas generator set according to claim 1, characterized in that, During the initial coarse mixing of natural gas, air and hydrogen, the pressure and temperature in the proportioning chamber (21) are monitored, and the opening size of the valve (23) between the proportioning chamber (21) and the mixing chamber (22) is adjusted according to the monitored pressure to deliver the mixed gas to the mixing chamber (22).

3. The method for hydrogen blending and gas supply of a natural gas generator set according to claim 1, characterized in that, The secondary fine mixing of natural gas, air and hydrogen involves introducing the mixed gas into a spiral channel for high-speed rotation and mixing.

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