The use of grate furnaces for domestic waste incineration has become the standard configuration in the industry. This paper analyzes several common incinerator structures in the industry in detail, from the aspects of Oxidation Resistant Chain Boiler Grate form, furnace arch form, and air distribution in the furnace. Describe the effect of these factors on combustion.
The Oxidation Resistant Chain Boiler Grate distributes the air reasonably and selects the appropriate excess air coefficient. The air required for the incineration of the waste incinerator is supplied by the primary air and the secondary air. The primary air is arranged on the same side under the grate, and there are eight electric dampers in total. Control, the secondary air is arranged in the furnace, on the front and rear arch water walls directly above, there are twelve nozzles in total, which are controlled by four electric dampers respectively. Through the aerodynamic field test and summarizing the incineration experience in the previous stage, the ratio of primary air and secondary air should be 6:4, which is more appropriate, so as to ensure the effect of waste incineration and the combustion and decomposition of combustibles in the flue gas, and at the same time the primary air is distributed with the air. It should meet the principle that the middle is large and the two ends are small, that is, the opening of the middle damper should be increased, and the opening of the two dampers should be decreased, because the second and third-level grate grate is the main combustion area, and the fourth-level grate is the burnout area. In this way, the air required for combustion in the furnace chamber of the garbage furnace can be met. In addition, reasonable air distribution can also be carried out according to the oxygen content of the flue gas in the horizontal flue of Oxidation Resistant Chain Boiler Grate. Generally, the oxygen content of the flue gas in the horizontal flue should be controlled between 10 and 12%. Therefore, only reasonable air distribution is required. In order to ensure the stable combustion of garbage. To maintain a stable negative pressure in the furnace chamber, the negative pressure in the furnace chamber of the garbage incinerator should be controlled between -20 and -50Pa.
If the negative pressure of the furnace is too small, the furnace is easy to spray dust outward, which not only affects the environmental sanitation, but also may endanger the safety of equipment and operators; and if the negative pressure is too small, the air leakage of the furnace will increase, which will increase the power consumption and smoke of the induced draft fan. Gas heat loss. Therefore, stabilizing the negative pressure of the furnace is of great significance to ensure the stable combustion of the Oxidation Resistant Chain Boiler Grate.