A staged combustion boiler system and method for oxygen-lean combustion catalytic oxidation of molten slag

Abstract

The invention discloses a slag lean-oxygen combustion catalytic oxidation type staged combustion boiler system and method. The slag lean-oxygen combustion catalytic oxidation type staged combustion boiler system comprises a lean-oxygen combustion chamber and a carbon monoxide catalytic oxidation device. A cavity is contained in the lean-oxygen combustion chamber. The upper end of the lean-oxygen combustion chamber is provided with a smoke outlet. A secondary combustion chamber is arranged on the downstream side of the smoke outlet of the lean-oxygen combustion chamber. A smoke inlet of the secondary combustion chamber communicates with the smoke outlet of the lean-oxygen combustion chamber. An air supplementation chamber is arranged on the downstream side of the smoke outlet of the secondary combustion chamber. A smoke inlet of the air supplementation chamber communicates with a smoke outlet of the secondary combustion chamber. The downstream side of the smoke outlet of the air supplementation chamber is provided with the carbon monoxide catalytic oxidation device. The smoke inlet of the carbon monoxide catalytic oxidation device communicates with a smoke outlet of the air supplementation chamber. According to the slag lean-oxygen combustion catalytic oxidation type staged combustion boiler system and method, through staged combustion of coal, high efficiency and low emission of NOx can be achieved, and atmospheric pollution is lowered; a SCR denitration device is not arranged, so that the catalyst optimum temperature limitation problem, the ammonia injection mixing evenness problem, the catalyst waste treatment problem and other serious problems in the denitration process can be avoided.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a staged combustion boiler system and method for oxygen-poor combustion catalytic oxidation of molten slag. Background technique [0002] With the increasing growth of our country's national economy, the power consumption of various industries is increasing year by year, and various electric power industries are developing rapidly like mushrooms after rain. In recent years, thermal power coal-fired units have continued to occupy a leading position, and there will be no significant changes for a long time to come. At the same time, these thermal power units bring us the electricity we need to survive, and at the same time consume a large amount of non-renewable fossil energy, and the combustion of fossil fuels will produce nitrogen oxides (NO x ), which is one of the main air pollutants and will have a certain impact on the ecological environment. [0003] In recent years, domes...

AI Technical Summary

Problems solved by technology

However, this technology often faces many serious problems in its application. For example, the active temperature range of the SCR catalyst is 320°C to 400°C. Problems; the influence of ammonia injection amount on the subsequent heating surface during the denitrification process; whether ammonia injection and flue gas can be mixed evenly, etc.

These existing problems will make it difficult for the denitrification efficiency of coal-fired boilers to reach the national requirement level under full load.

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