Compact distributed coal powder boiler with SCR (selective catalytic reduction device)

Abstract

A compact distributed coal powder boiler with an SCR (selective catalytic reduction device) comprises a boiler hearth in integral n shape arrangement, a horizontal flue and a tail flue; an overheater is arranged at the upside position in the boiler hearth; an outlet of the overheater is connected with a high-temperature coal economizer arranged in the horizontal flue; a steering chamber is connected in front of the high-temperature coal economizer; a high-temperature air preheater, an SCR reactor, a low-temperature coal economizer and a low-temperature air preheater are sequentially arranged in the tail flue behind the steering chamber from top to bottom; a denitration agent spraying position is arranged in front of the high-temperature air preheater. According to the compact distributed coal powder boiler with the SCR, the manufacturing cost and the occupation area of the boiler are saved and the denitration efficiency of the SCR is further improved.

Description

technical field [0001] The invention relates to a pulverized coal boiler, in particular to a pulverized coal boiler with an integrated layout of a flue gas selective catalytic reduction device (SCR). Background technique [0002] Pulverized coal boiler is the mainstream equipment of steam generator. The combustion of pulverized coal inevitably produces nitrogen oxides (NOx). Although the use of low-nitrogen burners can reduce the original NOx emissions to a certain extent, it cannot reach the environmental protection level. Therefore, it is necessary to install a flue gas selective catalytic reduction device (SCR) . The current SCR requires a relatively high reaction temperature, generally in the range of 320-400°C, while the exhaust gas temperature of the boiler is generally much lower than this level, so it is necessary to set the SCR between the heating surfaces of the boiler at a temperature of 320-400°C. in the district. [0003] The traditional pulverized coal boile...

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Problems solved by technology

The disadvantage of this structure is that the boiler occupies an increased area, the layout is messy, the resistance of the induced draft is large, the power consumption of the induced draft fan is high, and the consumption of steel is large.

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