Low bed pressure-reducing circulated fluid bed boiler combustion process

Abstract

This invention is a low bed pressure drop circulating fluidized bed boiler combustion technical method, which relates to rapid circulating fluidized bed boiler combustion technique. It makes sure the circulating fluidized bed rapid bed fluid state. The inner bed temperature is controlled within 850-930 degree. The fluidizing wind speed is 4-6.2m / s. The average particle size of circulating materials is smaller than 300mum. The material concentration of the space above combustion chamber second air port is kept 1-15Kg / m3 rapid bed state. This invention can greatly reduce the pressure head of first and second wind machines. Thus, it effectively reduces the power dissipation of assisting engines. In addition, as the space material concentration decreased, gas mixture improved, combustion intensified, the combustion efficiency of boiler is further increased. This invention can also reduce the attrition rate of combustion chamber water-cooled wall heating surface.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler combustion technology and equipment, in particular to a low bed pressure drop circulating fluidized bed boiler combustion process method. Background technique [0002] Circulating fluidized bed boiler is a device that uses the principle of fluidization to achieve high-intensity combustion, and controls the combustion temperature in the optimum desulfurization temperature zone of limestone. At the same time, due to the small amount of NO generated by coal combustion in this temperature zone, bottom pollution emissions can be realized. The gas-solid two-phase flow in the upper part of the combustion chamber of most circulating fluidized bed boilers belongs to the fast bed flow state. Fast bed refers to a kind of particle generation formed when the material concentration (referring to the weight of solid particles contained in the unit volume space in the combustion chamber) of a certain particle...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the deficiencies and defects of the prior art, the purpose of the present invention is to provide a low-bed pressure-drop circulating fluidized bed boiler combustion process method, which is under the precondition of maintaining a fast bed state in the circulating fluidized bed combustion chamber , by reducing the material stock per unit area to reduce the material space concentration in the upper part of the combustion chamber, so as to solve the problems of high power consumption caused by high fan pressure head, serious wear of the water wall in the combustion chamber and low combustion efficiency in the existing circulating fluidized bed boiler shortcoming

Images