Device and method for measuring ammonia content in flue gas by colorimetry

Abstract

The invention relates to a device and method utilizing a colorimetric method to measure the ammonia content of flue gas. The device comprises a flue gas sampling temperate constant device, a flue gas absorbing and acidifying device, a flue gas liquefying and absorbing device, an absorption liquid metering device, a precise time sharing addition device, an absorption liquid mixing and color-developing device, and an absorption liquid colorimetric device. The provided method comprises the following steps: processing the ammonia in flue gas, transferring the ammonia from the gas state to the liquid state, precisely quantifying the absorption liquid, adding precisely quantified chemical reagents, developing the color in the absorption liquid colorimetric device, measuring the absorbance of color developed liquid, and finally calculating the ammonia content of flue gas according to the absorbance of color developed liquid. According to the method, the ammonia in flue gas is transferred to a liquid solution, and crystallization and adhesion of ammonia gas are avoided. The colorimetric principle is utilized, the concentration of ammonium salt in absorption liquid is measured and can be converted into the concentration of escaped ammonia in flue gas, and thus the precise measurement is achieved.

Description

technical field [0001] The invention relates to a device and method for measuring ammonia content in smoke by colorimetry. It specifically involves the stable transportation of ammonia gas at high temperature. The high-temperature acidic absorption liquid absorbs ammonia gas. The absorption liquid is accurately measured and added with chemical reagents for color development. The color development liquid measures the absorbance at a chemical wavelength. By measuring the ammonia concentration in the liquid, Converted to the ammonia concentration in the flue gas. Background technique [0002] Flue gas denitrification technology is one of the main methods to control nitrogen oxide emissions in my country. At present, selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) with mature technology are mostly used at home and abroad for flue gas denitrification. [0003] These two methods all need to spray the reducing agent ammonia into the flue gas to re...

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Problems solved by technology

[0004] At present, the most commonly used test method is to use laser method to measure, but because the ammonia content in the flue gas is very low, coupled with the interference of water vapor, ammonia gas reacts with sulfur dioxide, resulting in adsorption and bonding, there will be relatively large errors

This is a problem that is difficult to overcome in the current ammonia escape online monitoring equipment

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