Application and Principle of the Second Combustion Chamber System

As we all know, the incinerator is a kind of harmless treatment equipment commonly used in the harmless treatment of medical and domestic wastes and animals. The principle is to use the combustion of coal, oil, gas and other fuels to incinerate and carbonize the objects to be treated at a high temperature to achieve the purpose of disinfection.

The incinerator is equipped with two combustion chambers, namely the first combustion chamber and the second combustion chamber. It adopts a two-stage combustion method. The first combustion chamber burns solids and the second combustion chamber burns gas: the solid waste enters the first combustion chamber and is dried at a predetermined temperature. Anaerobic pyrolysis and burnout effectively control the generation of highly toxic gas (dioxin); the gas produced by pyrolysis enters the second combustion chamber to be fully burned, effectively treating toxic and harmful gases. The solid ash after treatment in a combustion chamber is sorted, and after recycling scrap iron and glass, it is comprehensively used to make light construction materials.

The incineration equipment is usually a rotary kiln + secondary combustion chamber + tail gas treatment equipment; in order to achieve the secondary use of waste heat, the hot water heat exchanger can be used for hot water users or recycled; the tail gas is absorbed by the spray absorption tower and activated carbon , High-efficiency bag filter purification; one of the combustion chamber furnace temperature is 850~900 degrees Celsius, and the second combustion chamber is 1000~1200 degrees Celsius; the high temperature flue gas stays in the furnace for more than 2.0S; the combustion efficiency is greater than or equal to 99.9% ; The incineration removal rate is greater than or equal to 99.99%; the thermal reduction rate of the incineration residue is less than 5%; the height of the incinerator exhaust tube is greater than or equal to 35 meters. The flue gas produced by incineration enters the second combustion, and the unburned harmful substances in the flue gas are further destroyed in the second combustion chamber. In order to completely decompose the unburned materials and meet the emission requirements, the second combustion chamber is equipped with a burner to support combustion. A unique secondary air supply device is used to ensure that the flue gas is in full contact with oxygen at high temperatures, while ensuring the residence time of the flue gas in the second combustion chamber and adjusting the air supply volume according to the oxygen content of the flue gas at the outlet of the second combustion chamber.

The temperature in the second combustion chamber is controlled at 1000~1200 degrees Celsius, and the residence time is greater than 2s, so that the flue gas can be fully decomposed and burned in the furnace, so as to achieve a higher decomposition rate. At the same time, the large-size dust in the flue gas falls into the bottom of the second combustion chamber to complete the primary dust removal. The dust removal efficiency for 40um particle size dust is greater than 90%. In order to prevent the dusty flue gas from directly entering the heat exchanger, large-size dust deposits on the outer wall of the heat exchanger, causing blockage.

In order to quickly cool the flue gas and avoid the re-generation of dioxin, a water heat exchanger and an air heat exchanger are installed behind the second combustion chamber. After the high temperature flue gas is exchanged with the water heat exchanger, it enters the two-stage air heat exchange. The flue gas temperature is quickly reduced from 1100 degrees Celsius to 200 degrees Celsius and enters the subsequent treatment facility; the cold water is heated from 40 degrees Celsius to 65 degrees Celsius after heat exchange for users use. The cold air is heated from 20 degrees Celsius to 200 degrees Celsius into the furnace to support combustion.