A flue gas denitrification device for co waste heat boiler

Abstract

The invention discloses a novel flue gas denitrification device of a CO waste heat boiler. The unloading compressor unloads and compresses the liquid ammonia transported by trucks; the ammonia storage tank is located below the unloading compressor; The ammonia tank is connected; the ammonia buffer tank is connected to the ammonia evaporator through pipelines; the inlet of the ammonia dilution tank is connected to the ammonia storage tank, the ammonia buffer tank and the ammonia evaporator; the ammonia / air mixer is located under the ammonia buffer tank and connected to Ammonia injection grid; the CO waste heat boiler is connected to the ammonia injection grid through pipes, and the SCR reactor is located above the CO waste heat boiler and communicated with the CO waste heat boiler. In the present invention, SCR and waste heat boiler are combined for the first time for denitrification of FCCU; the SCR catalytic reactor module is directly placed on the upper layer of waste heat boiler, so that the entire SCR is compactly arranged, the floor area is reduced, and investment is reduced; the denitrification efficiency is high , High technology maturity, good utilization rate of reducing agent, little oxygen in exhaust gas participates in reaction, small heat release, no by-products and no secondary pollution.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and in particular relates to a novel flue gas denitrification device for a CO waste heat boiler. Background technique [0002] As NOx emissions continue to grow. National policies, national standards, and local standards related to NOx emission limits for flue gas from catalytic cracking units in China are becoming increasingly stringent. FCC flue gas denitrification will soon be included in mandatory implementation specifications. The main source of NOx in catalytic cracking flue gas is catalytic Nitrogen-containing compounds in raw materials, but so far there is no mathematical model for accurately predicting the relationship between nitrogen content in raw materials and NOx generation in flue gas. From the experience of FCCU operation, the amount of NOx in the flue gas is also related to the added carbon monoxide combustion aid and the heavy metal on the catalyst. The removal and trea...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new flue gas denitrification device for CO waste heat boiler, aiming to solve the problem of low denitrification efficiency of traditional liquid absorption method; high denitrification efficiency of adsorption method, but small adsorption amount, frequent regeneration, not widely used; high energy The electronic activation oxidation method can desulfurize and denitrify at the same time, but it has high energy consumption and short life; the SNCR method has a high ammonia escape rate, and the waste heat boiler does not have a temperature range of 850-1100 ° C, which is not suitable for the SNCR method for denitrification and has high safety hazards.

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