NOx emission control system for low-heating-value lignite

An emission control system and low calorific value technology, which is applied to controllers with specific characteristics, electric controllers, gas treatment, etc., to achieve the effects of timeliness, overcoming inaccurate NOx measurement, and overcoming the large delay in denitrification

Pending Publication Date: 2021-12-31
JINGNENG (XILINGUOLE) POWER CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the technical problems existing in the existing control method, and provides a NOx emission control system for low calorific value lignite

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • NOx emission control system for low-heating-value lignite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0041] Please refer to figure 1 , a NOx emission control system for low calorific value lignite, comprising the following steps:

[0042] Step S1: select a plurality of monitoring points at the entrance and exit of the SCR, in the present embodiment, select 3-5 monitoring points, thereby ensure the accuracy of detection data, and place NOx measuring instrument and wind speed measuring instrument on the monitoring point And the measurement data is transmitted to the server, the NOx measuring instrument is a handheld Testo350 flue gas analyzer, and the wind speed measuring instrument is a handheld Testo425 thermal anemometer;

[0043] Step S2: the boiler combustion data is transmitted to the server through the DCS sy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a NOx emission control system for low-calorific-value lignite, and the method comprises the following steps: selecting a plurality of monitoring points at an inlet and an outlet of an SCR, placing a NOx measuring instrument and a wind speed measuring instrument, and transmitting measured data to a server; transmitting the boiler combustion data to a server through a DCS system; carrying out model identification on the corrected measurement data and boiler combustion data to obtain SCR inlet and outlet NOx models, and correcting NOx prediction values according to a pure flue gas NOx value and an actual load to obtain SCR inlet and outlet NOx prediction correction values; according to the NOx prediction correction values of the SCR inlet and the SCR outlet, calculating the target value of the ammonia spraying amount; and enabling the PID controller to control the ammonia injection regulating valve to act, so the current ammonia injection amount approaches the target value of the ammonia injection amount. Most data adopted by the control system comes from boiler combustion data, the problem of large delay of denitration can be solved, and timeliness of denitration control is achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification control, in particular to a NOx emission control system for low calorific value lignite. Background technique [0002] In 2012, the Ministry of Environmental Protection issued a new "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011), which clearly stipulates strict emission standards for nitrogen oxides (NOx) in coal-fired power plants. Low-emission retrofitting projects pose a great challenge to the NOx control of coal-fired power plants. [0003] The current denitrification control is based on PID closed-loop adjustment, the target value of NOx at the SCR outlet is preset, and the required ammonia injection amount is calculated by the SCR reactor inlet NOx concentration, flue gas flow and other parameters. This adjustment method has the following problems in practical application: [0004] (1) The inlet and outlet of the SCR reactor have the disadva...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56G05B11/42
CPCB01D53/8631B01D53/8696G05B11/42B01D2258/0283
Inventor 李洪生李虹亮丁建兵王海鹏张鑫于浩淼李瑞东宋晓飞
Owner JINGNENG (XILINGUOLE) POWER CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap