Solid fuel pneumatic conveying heating method and system capable of controlling content of ash combustible

Abstract

The invention discloses a solid fuel pneumatic conveying heating method and system capable of controlling the content of ash combustible, wherein the method is characterized in that: at room temperature, solid fuel particles with grain size of 0 to 8mm are conveyed into a conveying section of a jetting bed combustor via a worm feeder; air and gas mixed fuel is combusted in a smoke generator when the jetting bed combustor is ignited in order to generate the smoke with the pressure from 3000 to 8000pa and the temperature from 400 to 1000 DEG C, the smoke is fed to the conveying section of the jetting bed combustor, after the combustion of the jetting bed combustor becomes stable, a smoke mixer is closed, the air at room temperature and the smoke are fed to the smoke mixer via a blower so that the oxygen content of the mixed gas is 10% to 18%; and the mixed gas carrying the solid fuel enters a combustion section of the jetting bed combustor at the speed of 9 to 15m/s, the ash combustible which is subjected to cyclic jetting combustion enters a cyclone separator to obtain solid coke and semicoke, a part of the smoke discharged by the cyclone separator enters a waste heat boiler through a dust remover for the purpose of reutilization, and another part of the smoke is fed to the smoke mixer by a circulating fan to serve as recycling smoke for controlling the oxygen content.

Description

technical field [0001] The invention relates to the technical field of dry distillation of solid fuel, and relates to a solid fuel pneumatic conveying temperature raising method and system for controlling the content of ash and slag combustibles. Background technique [0002] Dry distillation of lignite and oil shale can use solid heat carrier dry distillation technology. Dry distillation of oil shale with solid heat carrier refers to the process in which raw material shale is in direct contact with a pre-heated solid heat carrier to conduct heat transfer and dry distillation reaction occurs. Oil shale solid heat carrier method carbonization oil production technology processes powdery and granular raw materials. The raw material shale particles are heated by dispersed solid heat carrier. Due to the small particles, uniform mixing and large contact surface area, a faster heating speed can be achieved, and the oil can be recovered High rate. And because of its high utilizati...

AI Technical Summary

Problems solved by technology

However, since this method only uses pure air as the oxidant, it cannot well control the combustible content in the solid product after fuel combustion

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