Ultra-enthalpy plasma composite combustion-supporting combustion test device for low-concentration combustible gas at atmospheric pressure

Abstract

The invention discloses a super-enthalpy plasma composite combustion-support combustion testing device for normal-pressure and low-concentration combustible gas. The device mainly comprises gas sources, a combustor and corresponding gas pipelines, wherein the combustor mainly comprises a combustor spray pipe, a quartz pipe, discharge electrodes, an external electrode, a high-voltage power supply and a flow guide plate, the discharge electrodes and the external electrode generate dielectric barrier discharge through the quartz pipe under the action of the additional high-voltage power supply, and plasma is formed in a chamber of the combustor to support combustion; the corresponding gas pipelines mainly comprise a combustible gas pipeline and an exhaust pipeline, the combustible gas pipeline and the exhaust pipeline have a longer attachment section, so that initial temperature of combustible gas is increased, and the super-enthalpy combustion condition is met. According to the device, high-efficiency super-enthalpy combustion and plasma composite combustion support in limited space are realized, combustible limit of combustible gas is broadened while the super-enthalpy preheating temperature is reduced, and the device can be used for combustible limit and combustion performance tests of various combustible gases with low concentration and low heat value.

Description

technical field [0001] The invention relates to the technical field of energy utilization and combustion, in particular to an ultra-enthalpy plasma composite combustion-supporting combustion testing device for low-concentration combustible gas at normal pressure. Background technique [0002] The combustion and utilization of low-concentration combustible gas has been a key research direction in the field of energy and combustion in recent years, and plays a vital role in improving energy utilization efficiency and reducing greenhouse gas emissions. For example, coal mine exhaust gas (also known as exhaust gas, the main component is low-concentration methane, the volume concentration is usually less than 1%, and the lower limit of flammable concentration of methane is about 5%) and rock formations emitted by mining worldwide every year , The accidental overflow and leakage of seabed methane, the greenhouse effect and ozone destruction caused by it have had a serious impact o...

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Problems solved by technology

In terms of widening the flammability limit of gases, the main technical means used in the industrial field include hyperenthalpy combustion, catalytic flow combustion, etc., and these methods also have some limitations: For example, Weinberg published in the authoritative international journal "Nature" as early as 1971 (Nature) vol. 233, pages 239 to 241, "Combustion Temperature: the future" (Combustion Temperature: the future) has clarified that for 1% volume concentration of methane and air mixed with combustible gas, theoretically, the combustible gas should be pre-preheated. Self-sustained super-enthalpy combustion can only be achieved when the temperature is about 1000 degrees Celsius, which not only increases the risk of the system, but also the preheating heat source used often causes a lot of energy consumption and waste

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