Supergravity SCR denitrification device and denitrification technology thereof

A technology of supergravity and supergravity rotation, which is applied in the field of SCR denitrification, can solve the problems of safety hazards in the liquid ammonia gasification process, high energy consumption, and high operating costs of the thermal decomposition of urea process, so as to shorten the gas-liquid contact time, simplify the process, The effect of increasing the gas-liquid contact specific surface area

Active Publication Date: 2018-09-04
ZHONGBEI UNIV
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Problems solved by technology

[0004] The invention provides a supergravity SCR denitrification device in order to solve the problems of potential safety hazards in the liquid ammonia gasification process in the SCR denitrification technology, high operating costs of the thermal decomposition urea process, and the need for a diluti

Method used

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  • Supergravity SCR denitrification device and denitrification technology thereof

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Embodiment 1

[0029] Example 1: The concentration of industrial ammonia water is 25%, and its main equipment: the supergravity rotating packing bed adopts stainless steel wire mesh packing, and the shell and storage tank of the rotating packing bed are made of 304 stainless steel. The gas-liquid contact mode is cross-flow.

[0030] First, turn on the cross-flow rotary packed bed, control its supergravity factor at 58.5 through the frequency converter 8, open the liquid valve, start the centrifugal pump 5 to send ammonia water to the supergravity rotary packed bed 1, and keep the ammonia water feed at 0.2m 3 / h, open the gas valve, adjust the gas flow meter to keep the gas-liquid ratio at 2500m 3 / m 3 , ammonia water and air contact in the filler to complete the mass transfer process; when all the ammonia water in the ammonia water raw material tank enters the supergravity rotating packed bed, close the liquid valve and liquid pump; when the liquid outlet 1.4 of the rotating packed bed is n...

Embodiment 2

[0031] Embodiment 2: change following conditions, other conditions are the same as embodiment 1. The high-gravity factor of the high-gravity rotating packed bed is adjusted to 131.7, the gas-liquid ratio is 2500, the final stripping rate can reach 85.1%, and the ammonia production concentration of the rotating packed bed is 12.9%.

Embodiment 3

[0032] Embodiment 3: change following conditions, other conditions are the same as embodiment 1. The high-gravity factor of the high-gravity rotary packed bed is adjusted to 179.2, the gas-liquid ratio is 2500, the final stripping rate can reach 85.5%, and the ammonia production concentration of the rotary packed bed is 13.0%.

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Abstract

The invention belongs to the technical field of SCR denitrification, solves the problems that potential safety hazards exist in the liquid ammonia gasification process in the SCR denitrification technology, the operating cost of the urea pyrolysis technology is relatively high and a dilution fan is needed for diluting ammonia concentration and is large in energy consumption, and provides a supergravity SCR denitrification device and a denitrification technology thereof, so that the ammonia producing concentration reaches the ammonia required concentration of the SCR denitration technology, andthe ammonia producing concentration realizes precision numerical control. A gas inlet is communicated with a blast blower, a gas outlet is connected with an SCR reactor through an ammonia spraying grating, a liquid inlet is communicated with an ammonia water raw material tank through a centrifugal pump, a liquid outlet is connected to a waste liquid tank, a frequency changer is arranged on the motor of a supergravity rotating filler bed, and an ammonia concentration detector, a liquid flow sensor, a gas flow sensor, the frequency changer and a nitric oxide concentration detector are connectedto a control system. The problems such as the dangerousness of the liquid nitrogen gasification process and high operating cost of the urea pyrolysis technology are solved; the ammonia escape rate isreduced, so that secondary pollution on the environment caused by extremely high ammonia escape rate is avoided.

Description

technical field [0001] The invention belongs to the technical field of SCR denitrification, and in particular relates to a supergravity SCR denitrification device and a denitrification process thereof. Background technique [0002] Industrial nitrogen oxide emissions are large, causing serious damage to the environment and human life. At present, a common method for treating nitrogen oxides emitted from industrial flue gas is selective catalytic reduction (ie, SCR technology). The principle of SCR denitrification technology is to use ammonia as a reducing agent to react with nitrogen oxides in the boiler to generate nitrogen and water to achieve the purpose of treating nitrogen oxides. [0003] Common processes for providing reducing agent ammonia in SCR denitrification technology include urea pyrolysis process and liquid ammonia gasification process. The urea pyrolysis process is relatively safe to operate and the urea is stored in normal pressure and dry state, which has...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/346B01D53/8631B01D2251/2062B01D2258/0283
Inventor 祁贵生刘有智郑奇李伟伟
Owner ZHONGBEI UNIV
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