Sampling system for atmospheric pollutants discharged by civil cooking range

Abstract

The invention discloses a sampling system for atmospheric pollutants discharged by a civil cooking range. The sampling system comprises a smoke capturing part, a diluted air part, an exhausting part and a measuring and sampling part. All smoke discharged by the cooking range is captured by a hood and is diluted by clean air, the smoke temperature and the pollutant concentration are reduced, the flow of the diluted gas is kept stable, the gas rate is in a measurable range, and the atmospheric pollutants are collected by using an atmospheric environmental sampling method. The sampling system disclosed by the invention has the advantages that the sampling system is suitable for discharging measurement of different cooking range structures, is not subjected to the influence of concentration of external background atmosphere, and is reliable in measuring result.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a sampling system for air pollutants discharged from civil stoves. Background technique [0002] my country's rural domestic energy is still dominated by biomass fuels such as straw and fuelwood; in recent years, my country's rural households directly burn 300 million tons of straw and 150 million tons of fuelwood each year for cooking and heating, equivalent to 204 million tons of standard coal; Biomass fuels are primarily burned in conventional biomass stoves. In addition, the burning of raw coal is the main method of cooking and heating for households in small and medium-sized towns, rural areas, and non-centralized heating areas in my country; conduct. The above civil stoves burning biomass or coal have a simple structure, and the mixture of fuel and air is basically a natural mixture during combustion, and the mixing effect is not good; at the same time, due t...

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Problems solved by technology

[0003] Civilian stoves are small-scale combustion sources. The smoke emission rate of this type of combustion source is unstable and extremely small. Some small-scale combustion sources have no flue or chimney, so it is difficult to quantitatively measure the emission of pollutants by using the commonly used test methods for fixed combustion sources. The main performance In the following aspects: 1. For a stove without a chimney, the flue gas escapes everywhere, and it is difficult to capture the flue gas; 2. For a stove with a chimney, the operating conditions fluctuate greatly, and the flue gas emission rate is unstable and low , even lower than the detection limit of the flow rate measuring instrument, it is difficult to accurately measure the flue gas velocity, and it is difficult to determine the amount of flue gas emissions and pollutant emissions

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