Cement plant SCR denitration efficiency monitoring control method

A technology of denitration efficiency, monitoring and control, applied in various fluid ratio control, separation methods, chemical instruments and methods, etc., can solve the problems of secondary environmental pollution and increase of ammonia gas escape.

Active Publication Date: 2014-04-16
BEIJING UNIV OF TECH
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Problems solved by technology

Theoretically, under optimal conditions, 1 mol of NOx is completely reduced and requires 1 mol of NH 3 Therefore, if the amount of ammonia injection is insufficient, the denitrification efficiency will be easily reduced, but if the amount of ammonia injection is too large, although the denitrification efficiency is guaranteed, it is easy to increase the escape amount of ammonia gas, causing secondary environmental pollution

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  • Cement plant SCR denitration efficiency monitoring control method
  • Cement plant SCR denitration efficiency monitoring control method

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Embodiment Construction

[0029] According to the accompanying drawings in the following figure 1 and figure 2 , and the embodiments further illustrate the control system and control method for the detection of SCR denitrification efficiency in cement plants.

[0030] The design scale of the cement production line in the embodiment is 2500t clinker / day, and the actual output is 2500t clinker / day. The SCR reactor is installed after the waste heat boiler and before the bag filter for coal mill drying. The temperature of the inlet flue is about 200℃, and the total air volume is about 175000m 3 / h, the NOx content in the flue gas is about 600mg / Nm 3 .

[0031] The catalyst in the SCR reactor can use medium and low temperature catalysts, such as MnOx-CeO 2 -TiO 2 type catalyst, the catalytic efficiency can reach more than 90% at around 200°C, and the suitable ammonia nitrogen ratio is 0.9:1.

[0032] SCR reactor denitrification efficiency monitoring and control system in cement plant, including ammo...

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Abstract

The invention provides a cement plant SCR denitration efficiency monitoring control method and belongs to the technical field of cement production and discharging safety. An SCR reactor denitration efficiency control device comprises an inlet detection device, an outlet detection device, a calculation control device, and an ammonia spraying control device, wherein the outlet detection device is used for periodically testing the content of NOx and ammonia in smoke and sending the content value to the calculation control device; the calculation control device is used for receiving periodical data of the outlet detection device, accurately calculating the denotation efficiency of a reactor and the escape amount of the ammonia, and sending a control instruction to the ammonia spraying control device in the SCR reactor according to the calculated data result; the ammonia spraying control device is used for receiving the control instruction, periodically sending real-time ammonia spraying amount data to the calculation control device and controlling ammonia spraying amount by receiving the control instruction. The cement plant SCR denitration efficiency monitoring control method is aimed to accurately measure and precisely control the denitration efficiency of the SCR reactor, the escape ratio of the ammonia and the ammonia spraying amount and reduces the escape amount of the ammonia while high denitration efficiency is maintained.

Description

technical field [0001] The invention belongs to the technical field of cement production emission safety, and in particular relates to a method for monitoring and controlling the SCR denitrification efficiency of a cement plant. Background technique [0002] NOx is a common air pollutant, which has great damage to the environment. NOx mainly includes NO and NO 2 , can induce urban photochemical smog and stimulate human lungs. At present, my country's cement production ranks first in the world, and the cement industry is the third largest source of NOx emissions in my country. In 2011, the NOx emissions reached 3.843 million tons. Therefore, it is of great significance to monitor and control the denitrification efficiency of SCR reactor in cement plant to control NOx emission. [0003] The "Twelfth Five-Year Plan" of the cement industry has clearly defined the goal of reducing nitrogen oxide emissions by 10%. my country's current "Cement Industry Air Pollutant Emission St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D11/13B01D53/90B01D53/56
Inventor 崔素萍刘庆祎王亚丽马晓宇兰明章郭红霞
Owner BEIJING UNIV OF TECH
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