Coupled denitration system

Abstract

The invention discloses a coupled denitration system which is characterized by comprising a boiler provided with a dual-channel combustor, wherein the boiler is connected with a catalytic reaction chamber, and the inside of a pipeline at the inlet of the catalytic reaction chamber is provided with an ammonia-injection grid; the ammonia-injection grid is connected with an external ammonia supply system by virtue of a pipeline; the outlet of the catalytic reaction chamber is arranged at the bottom of the catalytic reaction chamber, and an air preheater is arranged at the outlet at the lower part of the catalytic reaction chamber; and a plurality of reaction layers are longitudinally arranged in the catalytic reaction chamber. The coupled denitration system is stable, safe and reliable in operation, the removal efficiency of nitrogen oxides can reach above 85%, and the escape rate of NH3 is maintained to be less than 2 ppm, therefore, the coupled denitration system is the most mature denitration technique at present. The dual-channel combustor can be used for combusting a variety of coals; the oil-injecting limit for low-load stable combustion is greatly reduced; the efficiency of the boiler is increased by 1-2.5%; the environmentally-friendly quality is improved; the system is simple and is easy to reconstruct; no coking phenomenon occurs; and through using a cold-boiler ignition technique, oil can be saved by 60-90%.

Description

technical field [0001] The invention relates to a coal-fired burner coupled denitrification system, and relates to the fields of energy and electric power. Background technique [0002] At present, the production status of thermal power equipment has the following characteristics: [0003] First, the types of coal are varied. The boiler is designed according to a single type of coal. Once the coal in operation deviates from the designed type of coal, the combustion conditions cannot be guaranteed, and the combustion quality (ignition, stable combustion and burning) will decline, which will inevitably affect the safety and security of the boiler. economy. [0004] Medium change is absolute, especially in the current changing situation of the coal market. In order to reduce power generation costs, power plants actively choose low-priced coal and other reasons. It is inevitable that boiler safety and economy will be affected. [0005] Second, to save oil for low-load stable...

AI Technical Summary

Problems solved by technology

[0008] Fifth, because the nitrates and sulfides produced during the combustion process are directly discharged into the atmosphere, they will pollute the air, cause acid rain, affect the ozone layer, and the gas itself is poisonous, affecting the human respiratory system. In severe cases, it will have adverse effects on human health. influences

Images