Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea

A fluidized bed reactor and the technology of the reactor are applied in the field of flue gas denitrification, which can solve the problem that the catalyst and urea cannot be mixed well, the unfavorable urea pyrolysis reaction proceeds smoothly and effectively, and the catalyst utilization and recovery are not considered. problems, to achieve the effect of ensuring the pyrolysis conversion rate, promoting heat exchange and momentum exchange, and low device cost

Active Publication Date: 2014-07-23
XI AN JIAOTONG UNIV
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Problems solved by technology

At present, the pyrolysis reactor commonly used in China does not take into account the utilization and recovery of the catalyst, let alone the

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  • Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea
  • Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea

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[0023] The present invention will be described in further detail below in conjunction with accompanying drawing

[0024] see figure 1 and figure 2 , the present invention comprises a cylindrical reactor body 1 made of heat-resistant steel, the lower part of the reactor body 1 is provided with a gas inlet 2 for feeding air or flue gas, and the upper part of the reactor body 1 is provided with a reaction product outlet 4, and the gas inlet 2 communicates with the reaction product outlet 4 to form a reaction cavity; the reaction cavity between the gas inlet 2 of the reactor body 1 and the reaction product outlet 4 is cylindrical, and the cross section of the reactor body 1 is Ring shape; the side of the reactor body 1 is provided with several solution inlets 3 for passing urea solution into the reactor body 1; the outside of the reactor body 1 is wrapped with several groups of heating resistance wires 5 from top to bottom. Exemplarily, two solution inlets 3 are evenly opened a...

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Abstract

The invention discloses a fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea. The fluidized bed reactor comprises a reactor body, wherein an air inlet for introducing air or smoke is formed in the lower part of the reactor body; a reaction product outlet is formed in the upper part of the reactor body; a plurality of solution inlets for introducing a urea solution into the reactor body are formed in the side surface of the reactor body; the outer side of the reactor body is coated with a plurality of groups of resistive heaters from top to bottom, and each group of resistive heaters are respectively connected with corresponding temperature control devices. By forming the solution inlets for introducing the urea solution in the side surface of the reactor body and arranging the resistive heaters for heating the reactor on the outer side of the reactor body, the urea can be pyrolyzed and transformed in the reactor, therefore the fluidized bed reactor disclosed by the invention is low in cost, simple to control and free of secondary pollution.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and relates to a reactor for pyrolyzing urea solution to generate ammonia gas, a denitrification reducing agent, in particular to a fluidized bed reactor for producing ammonia by pyrolysis of urea. Background technique [0002] my country's coal-based power generation mode has resulted in a large amount of nitrogen oxides (NO x ), the main means of denitrification in power plants are selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). In the denitrification process, the widely used reducing agent ammonia (NH 3 ) mainly comes from liquid ammonia, ammonia water and urea. Among them, liquid ammonia and ammonia water are dangerous chemicals. Once leaked, they may cause dangers such as combustion and explosion. Therefore, there are strict regulations and requirements in terms of transportation and storage, and the convenience of use is limited. Compared with liq...

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Application Information

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IPC IPC(8): C01C1/08
Inventor 惠世恩王登辉刘长春尚桐邹浩张庚张晓璐
Owner XI AN JIAOTONG UNIV
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