Coal-sludge multi-fuel combustion system based on two-medium flue gas drying and pneumatic transportation

Abstract

The invention relates to a coal-sludge multi-fuel combustion system based on two-medium flue gas drying and pneumatic transportation. A sludge storage cabin is connected with a spraying drying pipe; the spraying drying pipe is connected with a mixing chamber; one path of an inlet of the mixing chamber is connected with an outlet flue of a cyclone separator, and the other path is connected with an outlet of a dust remover through a cold smoke draught fan; a spraying drying pipe outlet I is connected with a rotary feeder I; a spraying drying pipe outlet II is connected with the cyclone separator; an exhausting hole of the cyclone separator is connected with a circulating fluidized bed boiler through a cooling condenser and an exhausting steam draught fan; an unloading hole of the cyclone separator is connected with a rotary feeder II; a limestone cabin is connected with a rotary feeder III; the rotary feeder I, the rotary feeder II and the rotary feeder III are connected with the circulating fluidized bed boiler through a spraying feeder; and a gas inlet of the spraying feeder is connected with a Roots draught fan. With the adoption of the coal-sludge multi-fuel combustion system, functions of sludge desiccation and transportation, residual heat utilization of dry tail gas, multi-fuel combustion of sludge and coal, control of pollutants and the like can be realized, and the diffusion of stench and dust is facilitated; and the system has the characteristics of simplicity, environmental friendliness and high efficiency.

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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