Coal-sludge co-combustion system based on high-temperature smoke drying and circulating fluidized bed boiler

Abstract

The invention relates to a coal-sludge co-combustion system based on high-temperature smoke drying and a circulating fluidized bed boiler. A discharging outlet of a sludge storage bin is connected with a feeding inlet of a spray drying pipe through a screw pump. An air inlet of the spray drying pipe is connected with an outlet flue of a cyclone separator of the circulating fluidized bed boiler. An outlet I of the spray drying pipe is connected with a dry sludge bin through a rotary feeder I, and an outlet of the dry sludge bin is connected with the circulating fluidized bed boiler through a spiral conveyer so that dry sludge in the dry sludge bin can be fed into a dense-phase zone of the circulating fluidized bed boiler through the spiral conveyer to be combusted; an outlet II of the spray drying pipe is connected with the cyclone separator, an unloading opening of the cyclone separator is connected with the dry sludge bin through a rotary feeder II, and an exhaust opening of the cyclone separator is connected with the circulating fluidized bed boiler through a cooling condenser and a vent fan. The coal-sludge co-combustion system integrates the functions of sludge drying, combustion and pollutant control, and has the characteristics of being concise, environmentally friendly and efficient.

Description

technical field [0001] The invention relates to a waste disposal system, in particular to a system for drying sludge and co-firing with coal. Background technique [0002] With the increasing amount of urban sewage generation and treatment, the sludge produced in the process of urban sewage treatment is also increasing day by day. Sludge is a floc composed of water, organic particles and inorganic particles, which contains a large amount of heavy metals, pathogens and refractory toxic organic substances, and emits odor. Therefore, sludge must be properly disposed of. [0003] Sludge pretreatment includes conditioning, concentration, dehydration, stabilization, and drying technologies. The final disposal of sludge mainly includes landfill, land use, construction material utilization, biological treatment, and incineration. Pyrolysis, gasification, and Emerging technologies such as thermal hydrolysis are also being researched and developed. Due to the increasing requirement...

AI Technical Summary

Problems solved by technology

This leads to complex system process, many equipments, large floor area and high investment cost; and because the dried sludge will emit dust and odor during the stacking and transportation process, and the sealing performance of the belt conveying system is poor, Therefore, it is easy to cause odor to spread in the factory area and nearby areas, resulting in a bad working environment and seriously affecting the enthusiasm of the power plant for incinerating sludge.

At present, there is also a sludge flue gas drying-pulverized coal boiler co-firing process scheme based on the fan mill pulverization system, but the gas-powder mixture produced during the process of drying the sludge in the fan mill and grinding it into powder has a strong The irritating smell, corrosiveness and high dust concentration make it difficult to separate the gas and powder, and the explosion-proof requirements are relatively high, so there is no engineering application yet.

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