Denitration automatic regulating loop device

An automatic adjustment and loop technology, applied in the direction of electric controllers, separation methods, controllers with specific characteristics, etc., can solve the problems of inability to input, interference of denitration automatic adjustment, and inability to input adjustment loops, to ensure efficiency and quality, The effect of preventing overshoot

Active Publication Date: 2017-03-22
大唐黑龙江发电有限公司哈尔滨第一热电厂
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Denitration automatic regulating loop device

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Effect test

Embodiment 1

[0023] A denitrification automatic adjustment circuit device, which consists of four parts: an automatic switch manual logic function circuit part; a normal adjustment function circuit part; a prohibition increase prohibition reduction function circuit part;

Embodiment 2

[0025]According to the denitrification automatic adjustment circuit device described in embodiment 1, it is characterized in that: the part of the manual switching logic circuit includes: a comparison device-1, and the two input terminals of the comparison device-1 are respectively fed back to the adjustment gate The signal 23 is connected to the output terminal of the analog quantity switching selection device 3, and accepts the output command of the adjustment gate feedback signal 23 and the analog quantity switching selection device 3, and the comparison device 1 calculates the deviation between the two, and the calculation result is used as the output command, and its output End is connected with the input end of high and low limit device-2; High and low limit device-2, the input end of described high and low limit device-2 is connected with the output end of comparison device-1, accepts the output command of comparison device-1, and with High and low limit value comparison...

Embodiment 3

[0027] According to the denitrification automatic adjustment circuit device described in embodiment 1 or 2, the normal adjustment function part includes: a set value device 19, and the set value device 19 accepts the manual set value signal of the operator, and outputs Terminal is connected with one of the input terminal S terminals of PID regulator 13; Lag device one 7, described lag device one 7 is connected with the modulated signal 24, accepts the modulated signal, and performs lag processing to the signal, its output terminal is connected with another input terminal P terminal of PID regulator 13; PID regulator 13, two input terminals S terminal and P terminal of described PID regulator 13 are respectively connected with setting value device 19 and hysteresis device one 7 , and accept the output command of the setting value device 19 and the hysteresis device one 7, output the control command after corresponding PID calculation according to the deviation of the two, and it...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86G05B11/42B01D53/56
CPCB01D53/8625B01D53/8696G05B11/42
Inventor 王启德刘士宏马文原魏超众吕作义
Owner 大唐黑龙江发电有限公司哈尔滨第一热电厂
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