SCR denitration urea hydrolysis ammonia production device

Abstract

The invention discloses an SCR denitration urea hydrolysis ammonia production device which comprises a urea storage and dissolution system, a urea hydrolysis reaction system, a urea supply and metering system and an ammonia gas separation system, wherein theammonia gas separation system is communicated with the urea hydrolysis reaction system through a connecting pipe; mixed steam generated by the urea hydrolysis reaction system is conveyed into the ammonia gas separation system through the connecting pipe, the ammonia gas separation system can separate and collect ammonia gas in the mixed steam, and an air pressure adjusting device is arranged on the ammonia gas separation system and used for adjusting the air pressure of gas conveyed into the ammonia gas separation system. The ammonia gas separation system can be automatically opened and closed, when urea is subjected to hydrolysis reaction to generate mixed steam, the ammonia gas separation system can automatically carry out ammonia gas separation on the urea, after urea hydrolysis is completed, the ammonia gas separation system can be automatically closed, and the complexity that the ammonia gas separation system needs to be manually opened all the time in the production process is avoided.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to an SCR denitrification urea hydrolysis ammonia production device. Background technique [0002] The combustion of boilers in thermal power plants produces a large amount of flue gas, in which the content of NOx is high. According to the requirements of the "Emission Standards of Air Pollutants for Thermal Power Plants" implemented on January 1, 2012, all fossil fuel combustion boilers must be equipped with denitrification devices, especially large boiler. The method used is the selective catalytic reduction (SCR method) chemical reaction: that is, the SCR method uses a large amount of ammonia (NH3). At present, there are three main methods of ammonia production at home and abroad according to the region and environmental conditions (including transportation and storage), namely ammonia water, liquid ammonia, and urea. Ammonia water, liquid ammonia, and ammonia ...

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Problems solved by technology

However, the ammonia gas separation system in the existing urea hydrolysis ammonia production system cannot automatically identify whether the urea in the urea hydrolysis reaction system has been decomposed and started to decompose. It needs to be opened and closed manually, which greatly increases the labor intensity of the operator. After that, the ammonia gas separation system cannot be automatically closed, which will cause the ammonia gas separation system to be idle for a long time, which will greatly reduce the service life of the ammonia gas separation system, and the mixed steam generated by the hydrolysis of urea is transported to the ammonia gas separation system through pipelines. Due to the non-heating operation in the process, the ammonia and carbon dioxide in the mixed steam have a reverse reaction, which reduces the production efficiency of the enterprise

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