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Flue gas SNCR (selective non-catalytic reduction) denitration control device and method

A control method and flue gas technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as increased NOX emissions, incomplete reactions, and secondary pollution, achieving good results, improving efficiency, and reducing The effect of running costs

Active Publication Date: 2014-08-27
SHANDONG SHOUFENG ENVIRONMENTAL PROTECTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature is too low, NH 3 The reaction is not complete, and ammonia escapes, causing secondary pollution; when the temperature is too high, NH 3 is oxidized to NO X , but increased NO X emission
Therefore, SNCR can only achieve a good denitrification effect in a very narrow temperature window.

Method used

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  • Flue gas SNCR (selective non-catalytic reduction) denitration control device and method
  • Flue gas SNCR (selective non-catalytic reduction) denitration control device and method
  • Flue gas SNCR (selective non-catalytic reduction) denitration control device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: a kind of flue gas denitrification SNCR device, the ammonia gas concentration requirement of setting its outlet is 10ppm, and the NO of outlet X The concentration requirement is 80ppm. The ammonia gas concentration Y at the outlet measured by the sensor is 9ppm, and the NO at the outlet X Concentration A is 100 ppm. According to the adaptive control system, A / Y is greater than the set value of 8. The automatic PID control of the PLC controller increases the speed of the reductant feed pump to make the NO X The outlet concentration meets the setting requirements.

Embodiment 2

[0063] Embodiment 2: a kind of flue gas denitrification SNCR device, the ammonia gas concentration requirement at its outlet is set to be 10ppm, and the NO at the outlet X The concentration requirement is 70ppm. The ammonia gas concentration Y at the outlet measured by the sensor is 9ppm, and the NO at the outlet X Concentration A was 80 ppm. According to the adaptive control system, A / Y is less than the set value 8. The automatic PID control of the PLC controller increases the speed of the air compressor to make the NO X The outlet concentration meets the setting requirements.

Embodiment 3

[0064] Embodiment 3: A kind of flue gas denitrification SNCR device, the ammonia gas concentration requirement at its outlet is set to be 10ppm, and the NO at the outlet X The concentration requirement is 80ppm. The ammonia concentration at the outlet measured by the sensor is 18ppm, and the NO at the outlet X The concentration is 60ppm. According to the adaptive control system, if A / Y is less than the set value of 8, the system calculates the automatic PID control of the PLC controller to reduce the speed of the reducing agent feeding pump to prevent ammonia gas from escaping.

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PUM

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Abstract

The invention discloses a flue gas SNCR (selective non-catalytic reduction) denitration control method. A field detection module and an adaptive control module are adopted, wherein the field detection module is used for measuring the temperature T above a grate of a boiler, the nitrogen oxide concentration of tail gas of the boiler, the ammonia concentration of a reducing agent, the flow of flue gas and the temperature of cooling water of a spray gun by using sensors; the adaptive control module is used for transmitting values measured by the sensors to a PLC (programmable logic controller) unit to adaptively control the position of the spray gun, the amount of the supplied reducing agent and the spraying pressure of the reducing agent, and displaying the working condition of a whole device on a display module. The sensor is used for measuring the temperature T above the grate, and corresponding nozzles are opened according to the following relationships.

Description

technical field [0001] The invention relates to flue gas SNCR denitrification technology for preventing and controlling air pollution, in particular to a flue gas denitrification control device and a control method for use thereof. Background technique [0002] my country's energy consumption is dominated by coal, and a certain amount of nitrogen oxides (NO X ), NO X are containing different amounts of NO and NO 2 Get the general name of the gas. NO X It is a toxic gas, which not only seriously endangers the health of the human respiratory system and cardiovascular system, causes pulmonary edema and even canceration, but also is one of the main causes of acid rain and photochemical pollution, destroys the ozone layer, damages animals and plants, and causes the greenhouse effect. At present, about 65% of nitrogen oxides in China are produced by coal combustion. Therefore, as the main coal-fired equipment, power plant boilers, industrial boilers, cement kilns, etc. X The ...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/56
Inventor 纪正飚王如刚周锋
Owner SHANDONG SHOUFENG ENVIRONMENTAL PROTECTION EQUIP CO LTD
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