Method for improving desulfuration efficiency of fluidized bed boiler

Abstract

The invention belongs to limestone addition method for improving desulfuration efficiency of circular fluidized bed boiler, and in particular relates to an addition method of desulfurizer limestone. The method is implemented by regulating granularity of limestone powder to below 1-3mm, pouring limestone powder into a coal unloading ditch with weight ratio of coal to limestone powder being 10-12:1, after mixing with coal in the coal unloading ditch, mixing the limestone powder and the coal by a paddle coal feeder at the bottom of the coal unloading ditch, conveying by a coal conveying belt anda forwarding station to further mix the coal and the limestone powder uniformly and conveying into a raw coal bunker, mixing the mixture of coal and limestone powder coming out of the raw coal bunkeragain by a secondary coal feeder, and conveying into the hearth of the boiler to react with sulfur dioxide gas in fume. The method overcomes the defects that conveying by the original limestone powder pipeline is difficult, the limestone powder is easy to blown away due to light weight and the abrasion of the pipeline is great, prolongs retention period in the boiler, improves desulfuration efficiency, reduces sulfur dioxide emission, has simple operation without replacing the original design and is an efficient replacement to the original system.

Description

technical field [0001] The invention belongs to a limestone adding method for improving desulfurization efficiency of a circulating fluidized bed boiler, in particular to a limestone adding method for a desulfurizing agent. Background technique: [0002] Circulating fluidized bed combustion technology is a high-efficiency, low-pollution clean coal combustion technology developed in the past 20 years. Due to its wide fuel adaptability, high combustion efficiency, efficient desulfurization, NO X It has been developed rapidly due to the advantages of low emission, high section heat load, large load adjustment ratio and fast load adjustment. With the continuous improvement of environmental protection requirements, some corresponding technical solutions for circulating fluidized bed boiler desulfurization have appeared in recent years. [0003] The principle of limestone desulfurization in circulating fluidized bed boilers is: adding limestone (CaCO 3 ), the limestone is calcin...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies and defects of the prior art, the purpose and task of the present invention is to provide a method for adding desulfurizer limestone, which is simple to operate, convenient to measure, and can be realized without making too much improvement to the original system; it can reduce the amount of limestone It can eliminate the wear and tear of the powder on the conveying pipeline, and eliminate the problems such as pipeline blockage and leakage caused by limestone powder during the conveying process; it can make the limestone powder and raw coal more uniformly mixed, and achieve the purpose of improving the desulfurization efficiency of the boiler