An intensified concentrated swirl pulverized coal burner

Abstract

The invention discloses a reinforcement and concentration type cyclone pulverized coal burner. The cyclone pulverized coal burner comprises a primary wind channel, an inner secondary wind channel and an outer secondary wind channel coaxially arranged in sequence from inside to outside; a primary wind nozzle is formed in an outlet end of the primary wind channel; an inner secondary wind nozzle is formed in an outlet end of the inner secondary wind channel; an outer secondary wind nozzle is formed in an outlet end of the outer secondary wind channel; the inner secondary wind nozzle and the outer secondary wind nozzle are both conically expanded; the inner diameters of the inner secondary wind nozzle and the outer secondary wind nozzle are gradually increased in a primary wind airflow direction; and the inner secondary wind nozzle is positioned in the outer secondary wind nozzle. The cyclone pulverized coal burner solves the problem of primary wind pulverized coals dispersed to a secondary wind flowing area, realizes the concentration classified combustion of the pulverized coals, solves the problem of too early mixing of a secondary wind and primary wind-powder mixture, realizes the air classification combustion, and achieves the purpose of reducing the generation of NOX.

Description

technical field [0001] The invention belongs to the technical field of combustion, in particular to an intensified and concentrated swirl pulverized coal burner. Background technique [0002] During the period from 1995 to 2000, the national NO X The total emission increased from 10.9 million tons to 12 million tons, an increase of only 1.1 million tons. However, it increased sharply to 24.0427 million tons in 2011, due to NO X It is one of the main precursors for the formation of haze weather and acid rain. The number of haze weather in my country is increasing and the duration is getting longer and longer. This not only affects traffic and crop growth, but also endangers human health, such as inducing heart disease, bronchial disease and lung cancer. Therefore, controlling NO X Emissions have become a top priority for environmental protection. According to statistics, more than 60% of NO X Emissions come from burning coal, about 55% of China's total coal consumption i...

AI Technical Summary

Problems solved by technology

The first two measures are easy to cause the pulverized coal to be separated to the inner wall area of ​​the primary air channel, which will cause the pulverized coal of the primary air to mix with the swirling secondary air prematurely, which is not conducive to the control of NO X The third measure is to set up "the secondary air structure of the burner arranged in steps, so that the rotating internal and external secondary air can inject the primary air step by step" will cause two problems: (1) the primary air powder is burning The nozzle of the burner is prematurely mixed with the secondary air, or the primary air powder is ejected to the secondary air area by the secondary air, which weakens the graded combustion effect of the thick and thin fuel; (2) The structure of the secondary air nozzle of the burner arranged in steps makes the The secondary air participates in pulverized coal combustion prematurely, which weakens the effect of air staged combustion

Both of these problems are not conducive to the inhibition of NO x generated, limiting the swirl burner NO x removal ability

Therefore, the current three methods limit the swirl burner to further reduce NO x discharge capacity

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