Semi-coke powder circulating fluidized bed boiler based on material and heat balance

Abstract

The invention discloses a semi-coke powder circulating fluidized bed boiler based on material and heat balance. The semi-coke powder circulating fluidized bed boiler comprises a boiler body and a tailflue, wherein the boiler body and the tail flue are connected through a cyclone separator, a fluidized air distribution bed for supplying primary air is arranged at the bottom of the boiler body, a secondary air distribution device used for supplying secondary air is arranged on the side wall of the boiler body, the separation efficiency of the cyclone separator is not lower than 99.8%, the secondary air distribution device is provided with an upper secondary tuyere and a lower secondary tuyere, and a hearth of the boiler body is divided into a first zone, a second zone, a third zone and a fourth zone. According to the semi-coke powder circulating fluidized bed boiler based on material and heat balance, stable and efficient combustion of pure semi-coke powder can be realized on the premise of low-sulfur and low-nitrogen discharge.

Description

technical field [0001] The invention relates to the field of clean coal combustion, in particular to a blue-coke powder circulating fluidized bed boiler based on material heat balance. Background technique [0002] Semi-coke is a clean coal fuel with low volatile matter, low sulfur and nitrogen, high fixed carbon content and high calorific value prepared by dry distillation of bituminous coal. Semi-coke powder refers to semi-coke particles with a particle size within the range of 0-6mm. [0003] Like semi-coke, semi-coke powder also has the problems of low volatile content, difficulty in ignition, low burn-out rate, and high carbon content in fly ash after combustion, which easily leads to low boiler thermal efficiency, thus restricting the use of semi-coke powder in the combustion field. application and promotion. [0004] At present, the country implements the policy of environmental protection and emission reduction. Most thermal power coal-fired users are generally face...

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Problems solved by technology

[0005] However, in the application practice of the existing circulating fluidized bed boilers, blue coke powder can only be blended, and the proportion of blended blue charcoal powder is generally not more than 20%. The burnout rate of charcoal powder is low, therefore, semi-coke powder cannot achieve a large proportion of mixed combustion at present, let alone fully burn semi-coke powder

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