52results about How to "Reduce carbon content in fly ash" patented technology

A gas-solid separator of a recirculating fluidized bed boiler comprises a downward flue and an upward flue which are separated from front to back by a membrane-type guided flue gas downward and upward turning screen; the downward flue and the upward flue are communicated with each other through a swerving passageway and a feed bin which is hermetically installed below the downward flue and the upward flue; a flue gas inlet is arranged at the front upper part of the gas-solid separator and a flue gas outlet is arranged at the back upper part of the gas-solid separator; four walls of the gas-solid separator are all water cooled walls which are integrated with the boiler; the gas-solid separator further comprises a flow equalizing and separating tube bundle and an abrasion-proof communication pipe which are located on the swerving passageway; the upper end of the flow equalizing and separating tube bundle on the swerving passageway is communicated with a lower cross collecting tank of the membrane-type guided flue gas downward and upward turning screen, and the lower end of the flow equalizing and separating tube bundle on the swerving passageway is communicated with a cross collecting tank of the feed bin; and the upper end of the abrasion-proof communication pipe on the swerving passageway is communicated with the lower cross collecting tank of the membrane-type screen, and the lower end of the abrasion-proof communication pipe on the swerving passageway is communicated with a cross collecting tank of the communication pipe. In the case of circulation at low ratio, inertia gravity is used for single stage separation, and in the case of circulation at high ratio, when the speed of the smoke in the upward flue is high, low-temperature cyclone separation can be combined with inertia gravity separation for double-stage separation.

A coal-fired boiler staged combustion air depth air staged combustion low NOx control method, by optimizing the air volume distribution and excess air coefficient of each combustion reaction area in the furnace height direction of the coal-fired boiler, the depth of the main burner area in the lower part of the furnace is realized. Staged air combustion; multi-stage auxiliary embering air nozzles are set in the low-oxygen combustion and reduction area between the main burner area and the embering area, and each auxiliary embering air nozzle is arranged on the front and rear walls of the boiler furnace and the left and right side walls, one by one. The appropriate amount of combustion air is sent into the stage area; multi-layer main combustion air nozzles are set in the combustion area above the furnace, which is beneficial to the combustion of coal powder and the gradual reduction of NOx regeneration. The invention realizes the gradual reduction of NOx produced in the low-oxygen combustion and reduction zone and the release and transformation of coke nitrogen, minimizes the regeneration of NOx in the burnout zone and the final NOx emission concentration, and simultaneously avoids slagging on the wall surface of the furnace , high-temperature corrosion and increased carbon content of fly ash can simultaneously reduce NOx concentration and carbon content of fly ash.