Denitration automatic regulating loop device

Abstract

The invention discloses a denitration automatic regulating loop device. When the situation that a measured value is abnormal due to analysis meter purging, equipment system abnormality and other causes of a denitration system occurs, through a lagging device and a comparison device, the measured value changing condition can be judged, when the measured value is kept unchanged or changed slightly, a regulating loop is forbidden to increase and decrease, and the overregulation phenomenon of a regulating system is prevented. When the system returns to normal, automatic regulation can be restored and continued, the regulating loop does not need to be switched frequently between manual regulation and automatic regulation, and the automatic regulation efficiency and quality are ensured. The denitration automatic regulating loop device is composed of four parts and applied to the denitration automatic regulating loop.

Description

[0001] Technical field: [0002] The invention relates to a denitrification automatic adjustment loop device. In the measurement value judgment and prohibition increase and decrease loops, the adjustment loop does not need to be manually and automatically switched frequently, so as to ensure the efficiency and quality of automatic adjustment. [0003] Background technique: [0004] The denitrification automatic regulation loop is usually realized by DCS and connected through the method of function block diagram. For the SCR catalyst reduction denitrification technology, the denitrification automatic adjustment realizes the adjustment of outlet flue gas NOX by controlling the ammonia gas injection volume adjustment valve, and controls the denitrification efficiency within the design value range. As our country pays more and more attention to environmental protection, it is necessary for us to ensure that the discharge of net flue gas NOX reaches the standard. [0005] The denit...

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Problems solved by technology

[0006] The original denitrification automatic adjustment circuit has shortcomings and has not been able to be put into use

Disadvantages: The measured NOX value of the flue gas at the outlet is measured by a CEMS analyzer. The analyzer is an infrared extraction heating type. During the measurement process, the analyzer needs to be purged regularly (otherwise the dust in the flue gas will easily block the sampling pipeline). During the process, the output value remains the same as the measured value before purging, which is a great disturbance to the automatic adjustment of denitrification, making the original adjustment loop unable to be put into operation

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