Urea solution hydrolysis reactor

Abstract

The invention aims to provide a urea solution hydrolysis reactor which can receive a urea supersaturated solution as an incoming solution to reduce the steam content of an outlet of the reactor, so as to save energy and the consumption of desalted water. The urea solution hydrolysis reactor comprises a reaction kettle of which the bottom part is respectively provided with a urea solution inlet and a reaction liquid outlet, and a heating device and a steam stripping device, wherein the heating device and the steam stripping device are arranged sequentially along the urea flowing direction in the reaction kettle; a reaction gas phase product outlet is formed in the top part of the reaction kettle; the steam stripping device comprises a steam stripping steam inlet communicated to the bottom part of the reaction kettle; one end, extending into the reaction kettle, of the steam stripping steam inlet is connected with a steam stripping steam distributor. By using the steam stripping device, the steam input into the reaction kettle by the steam stripping device is enabled to directly contact the urea solution, in this way, not only is the hydrolysis of the urea solution accelerated, but also the ammonia gas generated in a liquid phase can be accelerated to diffuse continuously into a gas phase and to be output from the reaction gas phase product outlet.

Description

technical field [0001] The invention belongs to the technical field of urea hydrolysis ammonia production equipment in a flue gas denitrification system, and in particular relates to a urea solution hydrolysis reactor. Background technique [0002] Coal combustion in coal-fired power plants is accompanied by large amounts of nitrogen oxides (NO X ) emissions that pollute the atmosphere. Usually, a flue gas denitrification device is installed at the tail of the boiler, and the NO in the flue gas is removed by selective catalytic reduction (SCR). X , converting it into non-toxic and harmless nitrogen (N 2 ) and water (H 2 O), so as to meet the emission requirements. The denitration reducing agent ammonia (NH 3 ) There are usually three supply forms: liquid ammonia, ammonia water and urea. Among them, liquid ammonia and ammonia water are hazardous chemicals. The country has strict laws and regulations concerning the storage, use and transportation of liquid ammonia and a...

AI Technical Summary

Problems solved by technology

[0004] If urea and water are configured according to the hydrolysis reaction stoichiometric ratio of urea solution, then the mass concentration of urea solution needs to reach 77%, and the urea solution of this concentration must be the supersaturated solution of urea, so the supersaturated solution of urea is used as the hydrolysis reactor Incoming liquid will greatly reduce the content of water vapor at the reactor outlet, but none of the existing reactors can meet the process requirements for accepting urea supersaturated solution, the waste of raw materials is serious, and the energy consumption is relatively large

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