System and control method for producing ammonia gas by hydrolyzing urea solution

Abstract

The invention discloses a system for producing ammonia gas by hydrolyzing a urea solution. The system comprises a hydrolyzer, a hydrolyzer thermometer T1, a hydrolyzer pressure transmitter P, a hydrolyzer liquidometer L, a urea solution regulating valve A1, a hydrophobic heat exchanger, a steam regulating valve A2, a hydrolyzing gas outlet regulating valve A3, a steam heat exchanger, a hydrolyzing gas outlet thermometer T2, a hydrolyzing gas outlet flowmeter F, a steam hydrophobic valve and a hydrolysis system control module, wherein the hydrolyzer is provided with seven ports respectively connected with the components above; the hydrolysis system control module is respectively connected with the hydrolyzer thermometer T1, the hydrolyzer pressure transmitter P, the hydrolyzer liquidometer L, the urea solution regulating valve A1, the steam regulating valve A2, the hydrolyzing gas outlet regulating valve A3, the hydrolyzing gas outlet thermometer T2 and the hydrolyzing gas outlet flowmeter F through cables. The invention also discloses a control method for producing ammonia gas by hydrolyzing the urea solution, which is implemented through six steps. The system and control method disclosed by the invention are simple and reliable, and easy to control. Steam is taken as a heat source of a hydrolysis system, so that the operation cost and the energy consumption are reduced.

Description

technical field [0001] The invention relates to a system for producing ammonia by hydrolyzing urea solution and a control method thereof, which is applicable to a preparation system and a control method for providing a denitrification reducing agent (ammonia) for a flue gas denitrification device. The invention relates to a selective catalytic reduction (SCR) flue gas denitrification technology belonging to the field of environmental protection technology. Background technique [0002] The air pollutants produced after coal combustion mainly include sulfur dioxide, nitrogen oxides, soot (respirable particulate matter) and carbon dioxide as a greenhouse gas. Due to coal-burning emissions and motor vehicle emissions, the pollution of nitrogen oxides in my country has been very serious. [0003] In recent years, with the gradual improvement of environmental protection requirements, in order to reduce the emission of nitrogen oxides in the exhaust gas, boilers and other equipme...

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Problems solved by technology

Due to the high temperature of the medium, the pyrolysis method consumes a lot of energy, and the pyrolysis method must be equipped with a separate pyrolysis system for each boiler, so the investment cost is also high

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