Fuel gas concentration self-adaptive control method for fuel gas generating set

Abstract

The invention discloses a fuel gas concentration self-adaptive control method for a fuel gas generating set. The fuel gas concentration is the concentration of methane in fuel gas. The method comprises an open-loop fuel gas concentration self-learning starting control step carried out when the fuel gas generating set is not successfully started, wherein an engine ECU performs internal logic fuel gas concentration self-learning to reach the changed fuel gas concentration value, so that the set can be started smoothly; and the method further comprises a closed-loop fuel gas concentration self-learning control step, wherein the engine ECU continuously and finely adjusts the fuel gas methane concentration value repeatedly according to closed-loop data of an oxygen sensor, and finally performsaccurate self-learning to reach the changed fuel gas methane concentration value so that the fuel gas generating set can easily respond to the change of the concentration of the methane in the fuel gas. According to the method, the fuel gas generator set can accurately control the injection amount of a fuel gas valve and the air-fuel ratio better under the condition of fuel gas such as biogas, gasand biomass gas with the methane concentration variable, so that safe and stable operation is realized.

Description

Technical field [0001] The invention belongs to the technical field of gas generator set control, and in particular relates to an adaptive control method for gas concentration of a gas generator set. Background technique [0002] At present, gas generator sets have been widely used in oil exploration, coal mining, distributed energy and other fields. Gas generator sets are mainly composed of a gas engine and a generator. [0003] my country has abundant natural gas resources, among which low-concentration gas-fueled generators such as biogas, gas and biomass gas, which use methane as the main combustible gas, account for a considerable proportion of the entire gas-fired unit industry. However, since most types of gas such as biogas, gas, and biomass gas are obtained by artificial fermentation, the gas concentration refers to the concentration of methane in the gas. The concentration of methane in the gas varies with atmospheric temperature, humidity and raw materials, even within a...

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Problems solved by technology

[0004] At present, most low-concentration gas-fired generator sets use proportional mixers or Venturi mixers in order to adapt to changes in gas composition, and only use the above-mentioned mixers to adapt to changes in methane concentration, and the effect is often limited; The generator set uses the oxygen sensor for closed-loop control, but due to the limitation of its closed-loop adjustment ability, it is often unable to adapt to the rapid changes in the composition of the gas

During the production period, gas generator sets often fail to start due to a sudden decrease in gas concentration during use; on the contrary, in some cases, a sudden increase in gas concentration will cause the gas generator set to fire, knock or even pull the cylinder The occurrence of the situation, bringing economic and property losses to customers

[0005] Due to the change of gas concentration, the gas generator set cannot work normally. Generally, the manufacturer of the gas generator set needs to carry out on-site re-commissioning, or the customer needs to adjust the opening of the gas valve by himself, which is time-consuming and laborious, and the adjustment is difficult and the accuracy is not high. , it is difficult for the gas generator set to work in the proper gas mixture concentration range, which accelerates the wear of the gas generator set and reduces the service life

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