CN-116733638-B - Hydrogen-doped mixed gas supply method of natural gas generator set

CN116733638BCN 116733638 BCN116733638 BCN 116733638BCN-116733638-B

Abstract

The invention discloses a hydrogen-doped mixed gas supply method of a natural gas generator set, belongs to the field of gas supply of natural gas generator sets, and solves the problems that the existing generator sets are difficult in heat efficiency improvement and high in carbon emission. The method comprises the following steps of S1, respectively conveying air and natural gas into a mixer for mixing, S2, pressurizing the mixed gas in the step S1, conveying the pressurized mixed gas into a mixing proportion valve, S3, adding hydrogen into the mixing proportion valve for mixing, and S4, conveying the mixed gas in the step S3 into an engine. According to the hydrogen-doped mixed gas supply method for the natural gas generator set, air and natural gas are mixed and then mixed with hydrogen for secondary coarse mixing, and the mixed gas is conveyed to the engine for combustion after secondary fine mixing, so that the mixing of the natural gas, the hydrogen and the air is more uniform, the thermal efficiency of the natural gas generator set is effectively improved, and the carbon emission is reduced.

Inventors

LV LIQIANG
Zhuo Rongkang
Miao longsen
YANG JIAHAO
LIANG ZHONGBIN
DAI QIUJIN
YE XIAOLONG

Assignees

广西玉柴船电动力有限公司

Dates

Publication Date: 20260508
Application Date: 20230707

Claims (3)

1. The hydrogen-adding mixed gas supply method of the natural gas generator set is characterized by comprising the following steps of: s1, respectively conveying air and natural gas into a mixer (1) in two paths for mixing; s2, pressurizing the mixed gas in the step S1 and then conveying the pressurized mixed gas into a mixing proportion valve (2); S3, adding hydrogen into the mixing proportion valve (2) for mixing; s4, conveying the mixed gas in the step S3 to an engine (3); the step S1 comprises an air supply process and a natural gas supply process, wherein, The air supply process is that air enters the mixer (1) through the air filter (4); The natural gas supply process is that natural gas sequentially passes through a gas filter (5), an electromagnetic cut-off valve (6), a flame arrester (7), a pressure regulating valve (8) and a gas metering valve (9) to enter a mixer (1); when natural gas is supplied, the natural gas pressure between the gas filter (5) and the electromagnetic cut-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; In the step S3, the hydrogen is added into the mixing proportion valve (2) in the process of sequentially passing through the fuel gas filter (5), the electromagnetic cut-off valve (6) and the high-pressure reducer (10) and then is sprayed into the mixing proportion valve (2) through the nozzle component (11); when hydrogen is added into the mixing proportion valve (2), monitoring the hydrogen pressure between the gas filter (5) and the electromagnetic cut-off valve (6), the hydrogen pressure and the temperature between the high-pressure reducer (10) and the nozzle component (11) and the hydrogen pressure and the temperature between the nozzle component (11) and the mixing proportion valve (2) at the same time; In the step 3, the natural gas, the air and the hydrogen are firstly subjected to primary coarse mixing in a proportional containing cavity (21) of a mixing proportional valve (2), and then the mixed gas after mixing is conveyed into a mixing containing cavity (22) of the mixing proportional valve (2) for secondary fine mixing; When natural gas, air and hydrogen are subjected to primary coarse mixing, the hydrogen accounts for 5% or 15% or 30% or 50% of the total mixed gas; In the step 4, the mixed gas in the step 3 is conveyed to the engine (3) through the explosion-proof fire-retarding device (12), the intercooler (13) and the throttle valve (14) in sequence.
2. The method for feeding hydrogen into a natural gas power generator set according to claim 1, wherein the pressure and the temperature in the proportional chamber (21) are monitored during the primary coarse mixing of the natural gas, the air and the hydrogen, and the opening valve (23) between the proportional chamber (21) and the mixing chamber (22) is opened according to the monitored pressure to deliver the mixed gas into the mixing chamber (22).
3. The method for supplying hydrogen-doped gas in a natural gas power generating set according to claim 1, wherein the secondary fine mixing of natural gas, air and hydrogen is performed by introducing the mixed gas into a spiral gas passage for high-speed rotation mixing.

Description

Hydrogen-doped mixed gas supply method of natural gas generator set Technical Field The invention relates to the field of natural gas generator set gas supply, in particular to a hydrogen-doped mixed gas supply method of a natural gas generator set. Background In recent years, with the continuous release of policies related to distributed energy, the improvement of thermal efficiency and air-fuel ratio of a natural gas generator set has become a bottleneck. Meanwhile, the carbon dioxide emission can be effectively reduced by increasing the application ratio of the hydrogen energy in the energy consumption. In the process of realizing the large-scale utilization of pure hydrogen, the application of natural gas hydrogen loading is an effective scheme in the transition to pure hydrogen energy. The development data of the internal combustion engine show that the reactivity of hydrogen is higher than that of natural gas, and the hydrogen combustion speed is higher. The natural gas is used as the main fuel and is mixed with hydrogen, so that thinner combustion can be realized, and the emission is lower than that of NO X and CO 2 which are combusted by the hydrogen and the natural gas alone. Not only can better meet the environmental protection requirement, but also improves the thermal efficiency of the natural gas generator set to a certain extent. The development of the existing natural gas generator set is currently in a bottleneck period, the thermal efficiency of the generator set is difficult to improve, and compared with hydrogen fuel, the carbon emission of the natural gas generator set is higher. Therefore, there is a need to design a method for mixing and supplying hydrogen for a natural gas power generator set. Disclosure of Invention The invention aims to solve the technical problems in the prior art, and aims to provide a hydrogen-doped mixed gas supply method of a natural gas generator set, so that the thermal efficiency of the natural gas generator set is effectively improved, and the carbon emission is reduced. In order to achieve the above object, the present invention provides a method for supplying hydrogen by mixing and mixing of a natural gas power generator set, comprising the steps of: s1, respectively conveying air and natural gas into a mixer in two paths for mixing; S2, pressurizing the mixed gas in the step S1 and then conveying the pressurized mixed gas to a mixing proportion valve; s3, adding hydrogen into the mixing proportional valve for mixing; And S4, conveying the mixed gas in the step S3 to an engine. As a further improvement, the step S1 includes an air supply process and a natural gas supply process, wherein, The air supply process is that the air enters the mixer through the air filter; The natural gas supply process is that the natural gas sequentially passes through a gas filter, an electromagnetic cut-off valve, a flame arrester, a pressure regulating valve and a gas metering valve to enter a mixer. Further, when the natural gas is supplied, the natural gas pressure between the gas filter and the electromagnetic cut-off valve, the natural gas pressure and the natural gas temperature after the pressure regulating valve and the natural gas pressure and the natural gas temperature before and after the gas metering valve are monitored at the same time. In the step S3, the hydrogen is added into the mixing proportion valve in the process of sequentially passing through the gas filter, the electromagnetic cut-off valve and the high-pressure reducer, and then is sprayed into the mixing proportion valve by the nozzle component. Further, when hydrogen is added to the mixing ratio valve, the hydrogen pressure between the gas filter and the electromagnetic cut-off valve, the hydrogen pressure and the temperature between the high-pressure reducer and the nozzle member, and the hydrogen pressure and the temperature between the nozzle member and the mixing ratio valve are monitored at the same time. In step 3, the natural gas, air and hydrogen are first mixed in the mixing cavity of the mixing proportion valve, and then the mixed gas is conveyed to the mixing cavity of the mixing proportion valve for secondary fine mixing. Further, in the primary coarse mixing of natural gas, air and hydrogen, the hydrogen amount is 5% or 15% or 30% or 50% of the total mixed gas. Further, when the natural gas, the air and the hydrogen are subjected to primary coarse mixing, the pressure and the temperature in the comparative example cavity are monitored, and the opening valve between the proportional cavity and the mixing cavity is opened according to the monitored pressure, so that the mixed gas is conveyed into the mixing cavity. Further, secondary fine mixing of natural gas, air and hydrogen is performed by introducing the mixed gas into a spiral air passage for high-speed rotary mixing. In step S4, the mixed gas in step S3 is delivered to the engine through the explosion-proof fire retardant device,