Method for catalyzing urea hydrolysis by using nano aluminum oxide

Abstract

The invention provides a method for catalyzing urea hydrolysis by using nano aluminum oxide, and relates to the field of power plant flue gas denitration. The method for catalyzing urea hydrolysis by using nano-alumina comprises the following steps: preparing nano-alumina, carrying out urea catalytic hydrolysis reaction in a hydrolysis reactor by using nano-alumina as a catalyst, and installing a steam jet system at the lower part of the hydrolysis reactor. The technology has the following effects: water vapor is used as a steam stripping medium, gas generated by hydrolysis reaction is stripped out in time, the water vapor passes through a steam jet system, the turbulence degree of a urea solution is enhanced, gas-liquid mass transfer is enhanced, the generated gas is favorably discharged, and NH3 is prevented from being dissolved in water and a reverse reaction is prevented; and the high-speed gas fluid can disturb the suspended catalyst nano aluminum oxide in the hydrolyzer, so that the urea solution is in more sufficient contact with the catalyst, the catalytic hydrolysis reaction is facilitated, and the problems existing in a fixed bed reactor are solved.

Description

technical field

[0001] The invention relates to the field of flue gas denitrification in power plants, in particular to a method for catalyzing the hydrolysis of urea by using nanometer alumina. Background technique

[0002] The preparation of reducing agent for flue gas denitrification in thermal power plants is a very important link in the whole denitrification system. The most commonly used denitrification reducing agent in the denitrification system is NH 3 , and urea is an ideal source of ammonia. It is a synthetic non-toxic and odorless white crystal or powder. Its physical and chemical properties are relatively stable, and it is easy to transport in bulk and store for a long time. Urea is widely used in industrial and agricultural fields, and its use will not have adverse effects on personnel and surrounding residential areas.

[0003] At present, most of the catalysts used in urea catalytic hydrolysis patents are homogeneous catalysts, such as the patent "Urea Cata...