Coal water slurry suspension fluidization desulfurization and denitration combustion process

Abstract

The invention relates to a coal water slurry combustion desulfurization and denitration process, which comprises the following steps: carrying out a pretreatment on coal water slurry, and adding a denitration agent to the coal water slurry; paving a bed material media on an air distribution plate, wherein the bed material media comprises quartz sand and has a thickness of 300-500 nm; injecting the obtained coal water slurry into a spraying device, concurrently injecting a liquid desulfurization agent to the spraying device, uniformly spraying the obtained mixture to a combustion chamber after the coal water slurry and the desulfurization agent are mixed in the spraying device; heating primary air from a high pressure fan with an igniter into hot smoke gas when ignition is started; heating the bed material to a temperature of 400-500 DEG C with the hot smoke gas, and blowing up the bed material media and particle groups formed through spraying the coal water slurry with the air distribution plate so as to form a fluidization state; and carrying out rapid water precipitation on the particle groups sprayed on the bed material media under heating of the bed material media at the fluidization state so as to ignite and combust, wherein a combustion temperature achieves 900-1000 DEG C. According to the present invention, the pretreatment is performed on the coal water slurry, the denitration agent is added, a good denitration effect is achieved, a denitration rate is up to 60%, the liquid desulfurization agent is added while the coal water slurry is sprayed, a good desulfurization effect is achieved, and a desulfurization rate is up to 70%.

Description

technical field [0001] The invention relates to a combustion process, in particular to a process for realizing desulfurization and denitrification of coal-water slurry fuel during the suspension fluidized combustion process of the coal-water slurry. Background technique [0002] As an important new energy source, coal water slurry provides broad prospects for human development. At present, coal water slurry has been widely used as fuel in industry. However, during the combustion process of coal water slurry, a large amount of harmful and toxic gases will be produced, such as nitrogen oxides and sulfur oxides. In order to reduce the emission of harmful gases, in the current process, CaCO is mostly used in the combustion chamber for desulfurization. 3 method to achieve the effect of desulfurization in the combustion process, but due to the CaCO 3 Due to the inhomogeneity of particle combustion, the desulfurization effect cannot meet the requirements of emission standards;...

AI Technical Summary

Problems solved by technology

However, during the combustion of coal water slurry, a large amount of harmful and toxic gases will be produced, such as nitrogen oxides and sulfur oxides

In order to reduce the emission of harmful gases, in the current process, CaCO is mostly used in the combustion chamber for desulfurization. 3 method to achieve the effect of desulfurization in the combustion process, but due to the CaCO 3 Due to the inhomogeneity of particle combustion, the desulfurization effect cannot meet the requirements of emission standards; for denitrification, it is to reduce the combustion temperature of the furnace to prepare NO X generation, which seriously affects the efficiency of the boiler