Air supply device for combustor of divided-flow diesel exhaust simulation system

Abstract

The invention provides an air supply device for a combustor of a divided-flow diesel exhaust simulation system. The air supply device comprises an air supply system, a combustion system, a divided-flow adjusting system, a mixing system, an acquisition system and a control system, wherein the air supply system mainly comprises a fan and also comprises a corresponding frequency converter; the combustion system mainly comprises the combustor and also comprises various valve bodies and an actuator, which are required by the combustor; the divided-flow adjusting system mainly comprises an electric three-way divider valve; the mixing system mainly comprises a mixing drum and a pipeline matched with the mixing drum; the acquisition system mainly comprises an air flowmeter at the inlet of the fan and a gas flowmeter at the inlet of the combustor; the control system mainly comprises a control cabinet and an upper computer which control air supply, combustion and divided-flow adjustment. Under the total flow corresponding to the target air velocity, the flow of combustion air is improved through the divided-flow adjusting system to automatically reduce the flow of diluent air, and the response speed is high.

Description

technical field [0001] The invention relates to a combustion-supporting air supply device for a burner of a catalyst aging and evaluation tail gas simulation system, in particular to a combustion-supporting air supply device for a burner of a catalytic converter tail gas simulation system based on an electric three-way diverter valve. Background technique [0002] The number of motor vehicles is increasing day by day, and the advantages of diesel engines, such as large load capacity, low specific fuel consumption and high thermal efficiency, have been continuously promoted. Diesel engines have higher emissions of nitrogen oxides (NOx). Nitrogen oxides can cause lung disease and are a major cause of photochemical smog and acid rain. With increasing air pollution, emission regulations are becoming stricter worldwide. Among the numerous emission improvement technology routes emerging at the historic moment, Selective Catalytic Reduction (SCR) technology using ammonia gas gene...

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Problems solved by technology

[0005] 1) Excessive emission of diesel exhaust particulate matter will hinder the operation and collection of the exhaust component analysis device, and even cause damage to the device;

[0006] 2) The content of diesel engine exhaust components is uncontrollable;

[0007] 3) The working mode of the diesel engine itself determines that the exhaust gas flow and temperature cannot be controlled separately;

[0008] 4) The energy consumption of the diesel engine is large, and the use of about 30% of the heat of the exhaust gas of the diesel engine is at the cost of wasting about 70% of the energy;

[0009] 5) The requirements of the SCR catalytic converter performance test test conditions will cause a lot of wear and tear on the diesel engine itself, making the scrap rate of the test diesel engine higher;

[0010] 6) The working noise of the diesel engine is large, which affects the surrounding working environment;

[0011] 7) The maintenance cost required by the diesel engine is relatively high

[0014] Due to the high temperature of the tail gas produced by the simulated experimental system at the inlet of the catalytic converter, a high temperature resistant flowmeter must be used to calculate the flow rate, but this kind of flowmeter is very expensive, which greatly increases the cost of the entire system; if the burner is used for natural suction And the method of installing a flowmeter at the air inlet is relatively low cost, but because the pressure at the air inlet is atmospheric pressure and cannot be increased, it is difficult to ensure that the burner furnace maintains negative pressure to work and increase power, and the flowmeter at the air inlet will affect Air intake; if the forced air intake of the burner is used, that is, the method of installing a fan at the air inlet for separate air intake and a flow meter is more costly, and in order to ensure a constant gas flow rate at the inlet of the catalytic converter, the combustion air flow rate of the burner is changed At the same time, the dilution air flow must be changed accordingly, which greatly increases the difficulty of control

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