Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ammonia spraying amount controlling method for SNCR (selective no catalytic reduction) flue gas denitrating system for cement manufacturing

A control method and ammonia injection rate technology, applied in the field of flue gas denitrification, can solve the problems of difficult real-time and accurate control of ammonia injection rate, and difficulty in overcoming system nonlinearity and hysteresis, so as to be easy to popularize and use, improve NOx removal rate, and realize The effect of meeting emission standards

Inactive Publication Date: 2015-07-22
SICHUAN UNIV
View PDF4 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to overcome the nonlinearity and hysteresis of the system, and it is difficult to achieve real-time and accurate control of the amount of ammonia injection after the PID controller calculates and sends out the command of the opening degree of the regulating valve to control the flow of ammonia injection.

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
  • Ammonia spraying amount controlling method for SNCR (selective no catalytic reduction) flue gas denitrating system for cement manufacturing
  • Ammonia spraying amount controlling method for SNCR (selective no catalytic reduction) flue gas denitrating system for cement manufacturing
  • Ammonia spraying amount controlling method for SNCR (selective no catalytic reduction) flue gas denitrating system for cement manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Construction and training of BP neural network prediction model for ammonia injection amount

[0025] ① Construction of BP neural network prediction model for ammonia injection amount

[0026] In this embodiment, the ammonia injection amount BP neural network forecasting model is made up of input layer, hidden layer and output layer, such as figure 2 shown. Set the input layer neurons to Q(t), X in (t), T(t), X out (t+1) and U(t+1), where Q(t) is the inlet flue gas flow rate of the cement kiln calciner at time t, X in (t) is NO in flue gas at the inlet of cement kiln calciner at time t x concentration, T(t) is the inlet flue gas temperature of the cement kiln calciner at time t, X out (t+1) is the NO in the outlet flue gas of the cement kiln calciner at the moment (t+1) x concentration, U(t+1) is the NH in the outlet flue gas of the cement kiln calciner at time (t+1) 3 concentration; set the output layer neurons to y(t) and y 1 (t) / y 2 (t), where...

Embodiment 2

[0054] Example 2: Ammonia injection control of SNCR flue gas denitrification system in cement production

[0055] For the device configuration of this embodiment, see figure 1 , set two layers of ammonia injection areas in the 850-1050 °C area of ​​the cement kiln calciner 1, the first layer of ammonia injection area 2 is set at 900-1050 °C in the cement kiln calciner, and the second layer of ammonia injection area 3 is set at At 850-960°C of the cement kiln decomposition furnace, the first layer of ammonia injection zone and the second layer of ammonia injection zone are equipped with corresponding spray guns 15, and the spray guns 15 of the first layer of ammonia injection zone and the second layer of ammonia spray zone are respectively controlled by the first layer of ammonia injection zone. Ammonia flow regulating valve 4 in the ammonia injection zone on the first floor and ammonia flow regulating valve 5 in the ammonia spraying zone on the second floor control the amount ...

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

An ammonia spraying amount controlling method for an SNCR (selective no catalytic reduction) flue gas denitrating system for cement manufacturing includes the steps of firstly, arranging at least two layers of ammonia spraying areas in a cement kiln decomposing furnace; secondly, arranging a temperature sensor, a glue gas flow detecting sensor and a first NOx concentration detecting sensor at an entrance of the ammonia spraying areas, and arranging a second NOx concentration detecting sensor and an NH3 concentration detecting sensor at an exit of the cement kiln decomposing furnace; thirdly, by the aid of an ammonia spraying amount controlling system which is provided with an ammonia spraying amount BP (back propagation) neural-network predicting model, giving a total ammonia spraying amount and an ammonia spraying amount proportion between each two layers of the ammonia spraying areas via the ammonia spraying amount BP neural-network predicting model according to received flue gas temperature information, flue gas flow information and concentration information of NOx in flue gas at an entrance of the cement kiln decomposing furnace and concentration information of the NOx in the flue gas and NH3 concentration information at the exit of the cement kiln decomposing furnace, and controlling states of a total ammonia flow adjusting valve and branch ammonia flow adjusting valves according to the total ammonia spraying amount and the ammonia spraying amount proportions among the layers of the ammonia spraying areas to achieve real-time controlling of the ammonia spraying amount.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification in cement production, and in particular relates to a method for controlling the amount of ammonia sprayed in a selective non-catalytic reduction flue gas denitrification system in cement production. Background technique [0002] Currently, nitrogen oxides (NO X ) governance has become the top priority of my country's air pollution control. my country's cement production accounts for about 50% of the world's total. In recent years, it has shown a rapid increase trend. The annual new cement production accounts for more than 80% of the global new production. The NOx emitted by the cement industry X Accounting for about 10-12% of the total emissions, it is already the third largest NOx emitter after thermal power generation and vehicle exhaust. my country proposed in the "Twelfth Five-Year Plan" "Guiding Opinions on Energy Conservation and Emission Reduction in the Cement Industry" ...

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): G05D7/06
Inventor 江霞蒋文举魏文韫
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products