Coal desulfurization and decoking process

Abstract

The invention belongs to the technical field of boiler fuel, and particularly relates to a coal desulfurization and decoking process. The process comprises the following steps: preparing a desulfurizer by modifying chlor-alkali salt sludge, and blending with coal before feeding into a boiler combustion chamber, wherein the addition amount of the desulfurizer accounts for 0.8-1.2% of the weight of the coal; and when the combustion temperature in the combustion chamber exceeds 800 DEG C, spraying the desulfurizer into the combustion chamber in a mist form through a boiler furnace spray gun, wherein the addition amount of the desulfurizer accounts for 0.4-0.6% of the weight of the coal. Compared with the prior art, the coal desulfurization and decoking process has the following advantages: the chlor-alkali salt sludge is effectively utilized, and desulfurization is performed twice before combustion and in the combustion process, so that the desulfurization efficiency is greatly improved, thereby ensuring that the coal can be sufficiently combusted at high combustion stability; coke residues in the combustion chamber are loose and easy to fall; and secondary pollution is decreased. Thus, the desulfurization cost of a large power plant can be lowered.

Description

technical field [0001] The invention belongs to the technical field of boiler fuel, and in particular relates to a coal-fired desulfurization and coke cleaning process. Background technique [0002] With the rapid development of industry, the problem of environmental pollution has become more and more prominent. my country's control and treatment of harmful gases such as nitrogen oxides and sulfur dioxide have become more and more intensive. At present, in the fluidized bed combustion technology, coal and crushed limestone are Entering the boiler, it is in a suspended state in the furnace, and its combustion temperature is much lower than that of conventional boilers. In this temperature range, limestone has better activity, and the sulfur released during the combustion process will be absorbed by the surrounding limestone. Diluted, lower combustion temperature can reduce the generation of nitrogen oxides, but it is difficult to reduce the generation and emission of fuel nitro...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of industry, the problem of environmental pollution has become more and more prominent. my country's control and treatment of harmful gases such as nitrogen oxides and sulfur dioxide have become more and more intensive. At present, in the fluidized bed combustion technology, coal and crushed limestone are Entering the boiler, it is in a suspended state in the furnace, and its combustion temperature is much lower than that of conventional boilers. In this temperature range, limestone has better activity, and the sulfur released during the combustion process will be absorbed by the surrounding limestone. Diluted, lower combustion temperature can reduce the generation of nitrogen oxides, but it is difficult to reduce the generation and emission of fuel nitrogen oxides, and the addition of foreign substances of limestone in the furnace will change the characteristics of ash and slag in the furnace and the combustion Behavior is slagging in slag cooler and increased carbon content in fly ash. Boiler furnace slagging is an important problem that endangers the safe operation of boilers in power plants and the availability of units. With the expansion of unit capacity, the problem will become more prominent. Therefore, how to efficiently The desulfurization and cleaning of coke has become a subject of urgent research