Denitrating coal economizer high-temperature bypass device

Abstract

The invention discloses a denitrating coal economizer coal economizer high-temperature bypass device which comprises a coal economizer and a coal economizer bypass flue, wherein the inlet end of the coal economizer bypass flue is connected with one side of the coal economizer; an electrically operated baffle door is arranged at the inlet end of the coal economizer bypass flue; a coal economizer inlet is formed in the top of the coal economizer; a coal economizer outlet is formed in one side of the bottom of the coal economizer; a coal economizer ash hopper is arranged at the bottom of the coal economizer; the coal economizer outlet and the outlet end of the coal economizer bypass flue are connected with a vertical flue; an ammonia spraying grating is arranged on the vertical flue; a first horizontal flue is connected with the top of a denitrating reactor; a denitrating reactor inlet ash hopper is arranged at the bottom of a second horizontal flue; the bottom of the denitrating reactor is connected with a denitrating reactor outlet flue; and the denitrating reactor outlet flue is connected with an air preheater. The denitrating coal economizer coal economizer high-temperature bypass device provided by the invention has the beneficial effects that the necessary denitrating efficiency can be guaranteed, and the generation of sulfate and ammonium hydrogen sulfate can be inhibited; and large-grain ash slag in smoke can be removed, so as to avoid obvious hole blockage and erosion to a catalyst.

Description

technical field [0001] The invention relates to the technical field of out-of-stock technology, in particular to a high-temperature bypass device for a denitrification economizer. Background technique [0002] In traditional flue gas denitrification, for the denitrification SCR device, the effective reaction temperature range is generally 300-420°C. When the boiler load is low, the flue gas temperature at the outlet of the low-temperature section of the economizer is low, and when the effective reaction temperature is lower than 300°C, it is the same as There is a certain deviation in the minimum allowable temperature of 300°C for denitrification, so the denitrification efficiency cannot be maintained. Under the condition of the reference oxygen content of 6%, the nitrogen oxide emission concentration is higher than 50 mg / m3, and it is easy to generate sulfate and escape (escaping) Ammonia reacts with sulfuric acid to form ammonium bisulfate or ammonium sulfate. Ammonium bis...

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Problems solved by technology

[0002] In traditional flue gas denitrification, for the denitrification SCR device, the effective reaction temperature range is generally 300-420°C. When the boiler load is low, the flue gas temperature at the outlet of the low-temperature section of the economizer is low, and when the effective reaction temperature is lower than 300°C, it is the same as There is a certain deviation in the minimum allowable temperature of 300°C for denitrification, so the denitrification efficiency cannot be maintained. Under the condition of the reference oxygen content of 6%, the nitrogen oxide emission concentration is higher than 50 mg / m3, and it is easy to generate sulfate and escape (escaping) Ammonia reacts with sulfuric acid to produce ammonium bisulfate or ammonium sulfate. Ammonium bisulfate is in a viscous state at 150-230°C, which can easily cause ash, clogging and corrosion in the downstream air preheater and affect the stable operation of the entire system.

At the same time, after long-term use of the existing denitrification equipment, smoke and dust tend to accumulate on the filter layer, resulting in reduced denitrification effect

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