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.

The present invention discloses a combustion method for a pea coal circulating fluidized bed boiler and relates to the coal combustion technique. According to the method, pea coal particles with a diameter less than 2mm are taken as a fuel, limestone particles with a diameter less than 0.6mm are taken as a desulfurizing agent, and the fuel and the desulfurizing agent are added into a hearth. The combustion temperature in the boiler is controlled to be 850 to 950 DEG C; the fluidizing air speed is controlled to be 2 to 3.5m / s; the bed pressure drop is controlled to be 1 to 3kPa, and the primary air pressure head is controlled to be 5 to 7kPa; and when the NOx content of smoke is higher than an emission standard, ammonia water serving as a denitrifying agent is sprayed at an inlet of a cyclone separator. The pea coal with the small grain diameter serves as the fuel, so the invalid large particles content of the fuel is reduced, and the bed pressure drop and a primary air pressure head can be effectively reduced; because the height of a dense-phase area is reduced, the wear degree of a hearth heated surface can be reduced; and meanwhile, the fuel grain diameter is reduced, so that the stay time of the particles in the hearth is properly reduced, the 'inactivation' possibility of the fuel is efficiently decreased and the combustion efficiency is increased.

The invention relates to a method for improving W-type flame boiler efficiency. The method comprises steps of conducting coaly element and industrial analysis to a selected coal type, presetting a boiler combustion strategy, conducting boiler fuel combustion simulation according to the preset combustion strategy to acquire a boiler work condition, comparing and analyzing boiler work conditions upon different combustion strategies to acquire an optimal boiler grading combustion coaly proportion and coal grinding machine coal powder injection way. A proportion of the burning coal and anthracite can be well determined during the boiler grading combustion by the use of the method.

The invention relates to a coke-saving precast optimization control system for coke put into a furnace, which comprises a coke input system, a conveyor belt system, a blast furnace and a precast optimization control module, wherein a modifying agent control unit is arranged between the coke input system and the conveyor belt system; a heating system is arranged between the conveyor belt system and the blast furnace; and the precast optimization control module is connected with the coke input system, the conveyor belt system, the heating system, the modifying agent control unit and the blast furnace through a signal line. The thermal efficiency of the coke-saving precast optimization control system for the coke put into the furnace is greatly improved, and the coal-saving rate is 30-50 percent. By adopting the control system, the emission is reduced, and the emission loads of dust, slag, SO2 and the like are respectively and greatly reduced, thus, the neighboring environment is purified.

The invention relates to a combustion improvement technology of an industrial fire coal boiler, aiming to provide a low NOx coal dust combustion method and device based on underfire air and overfire air. The method comprises: injecting parts of two-strand air required for combustion into a hearth from a boiler bottom ash hopper; strongly mixing with aslant downward injected fuel jet flow; fully utilizing the space of the bottom ash hopper to prolong smoke dwell time; burning fuel in a low-temperature oxidation zone; preventing volatile components from converting to nitric oxide; upwards and aslant injecting upper-layer fuel to form a reducing zone, so as to reduce generated nitric oxide into N2; and lowering nitric oxide emission amount. The invention also provides a boiler device for realizing the method. Under the condition that the original combustion condition is not influenced essentially, the invention effectively lowers the emission of nitric oxide and is easy to reform the existing boiler.

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.