A horizontal boiler with staggered arrangement of sncr and ofa

Abstract

The invention provides a horizontal boiler with SNCR and OFA arranged in a staggered manner and relates to an industrial boiler. The horizontal boiler with the SNCR and the OFA arranged in the staggered manner aims at solving the problems that a horizontal industrial coal powder boiler in the prior art is high in denitration cost, consequently, the NOx emission amount of an industrial coal powderboiler is high, the coal powder over-fire effect is poor, the adaptive capacity on load changes is poor, and the heat efficiency is low. The horizontal boiler with the SNCR and the OFA arranged in thestaggered manner comprises a combustor, a hearth, an upstream flue, a set of primary amino reducing agent spraying ports, a set of primary over-fire air spraying ports, a set of secondary over-fire air spraying ports, a set of secondary amino reducing agent spraying ports and two sets of temperature sensors; the combustor is installed at the front end of the hearth; the upstream flue is communicated with the top of the rear end of the hearth; the primary amino reducing agent spraying port and the primary over-fire air spraying port are fixedly installed on the side wall, from the front end tothe back end, of the hearth; and the secondary over-fire air spraying port and the secondary amino reducing agent spraying port are sequentially installed on the side wall of the upstream flue from bottom to top. The invention is used in the industrial boiler coal powder combustion field.

Description

technical field [0001] The invention relates to an industrial boiler pulverized coal combustion boiler, in particular to a horizontal boiler in which SNCR and OFA are arranged alternately. Background technique [0002] In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 640 million tons. Among them, small and medium-sized pulverized coal boilers account for a high proportion of my country's industrial boilers, with a large number and wide distribution, and there are also common problems such as low boiler thermal efficiency and large pollutant emissions. They have become one of the most important sources of NOx pollutant emissions in my country. , and with the improvement of the economic level, people's requirements for the quality of the living environment are getting higher and higher. The Chinese government's requirements for the pollutan...

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Problems solved by technology

[0004] In order to solve the problems of high denitrification cost of horizontal industrial pulverized coal boilers in the prior art, resulting in high NOx emissions in industrial pulverized coal boilers, poor pulverized coal burnout, poor adaptability to load changes, and low thermal efficiency, the present invention further Provide a horizontal boiler with staggered arrangement of SNCR and OFA, SNCR (selective non-catalytic reduction, selective non-catalytic reduction) OFA (over-fire air, horizontal boiler with staggered arrangement of exhaust air)

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