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A urea pyrolysis denitrification control system

A control system and denitrification technology, applied in the field of urea pyrolysis denitrification control system, can solve the problems of poor anti-interference ability and large hysteresis of the control loop

Active Publication Date: 2021-03-09
YANTAI LONGYUAN POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a urea pyrolysis denitrification control system, which solves the problems of large control loop hysteresis and poor anti-interference ability of the existing urea pyrolysis denitrification control system

Method used

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  • A urea pyrolysis denitrification control system
  • A urea pyrolysis denitrification control system

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Embodiment 1

[0028] Embodiment 1 provides a urea pyrolysis denitrification control system, the urea pyrolysis denitrification control system includes: a denitrification system and a predictive control system;

[0029] The predictive control system is used to obtain the controlled variable of the denitrification system, perform predictive control according to the controlled variable, and output the urea total flow control command generated according to the predictive control result to the denitrification system;

[0030] The denitration system is used to control the total flow of urea solution entering the pyrolysis furnace according to the total urea flow control command, so that the absolute value of the difference between the NOx concentration at the outlet of the denitrification system and the first set NOx concentration is less than or equal to the first preset value, Among them, the denitrification system includes a pyrolysis furnace.

[0031] The urea pyrolysis ammonia production tec...

Embodiment 2

[0064] This embodiment provides a predictive control method for a urea pyrolysis and denitrification control system. The predictive control method is based on the urea pyrolysis and denitrification control system in Embodiment 1. figure 2 For the flow chart of the predictive control method of the urea pyrolysis denitrification control system, refer to figure 2 , the predictive control method includes the following steps:

[0065] S1: The predictive control system obtains the controlled variables of the denitrification system;

[0066] S2: Carry out predictive control according to the controlled variable;

[0067] S3: Output the urea total flow control command generated according to the predictive control result to the denitrification system;

[0068] S4: The denitrification system controls the total flow of urea solution entering the pyrolysis furnace according to the total flow control command of urea.

[0069]Specifically, the predictive control module receives the cont...

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Abstract

The embodiment of the present invention discloses a urea pyrolysis and denitration control system. The urea pyrolysis and denitration control system includes: a denitration system and a predictive control system; predictive control, and output to the denitrification system the urea total flow control command generated according to the predictive control results; the denitrification system is used to control the total flow of urea solution entering the pyrolysis furnace according to the urea total flow control command, so that the denitrification system exports NOx The absolute value of the difference between the concentration and the first set NOx concentration is less than or equal to the first preset value. In the embodiment of the present invention, the total flow rate of the urea solution is used as the control amount, and the total flow rate of the urea solution is given by predictive control, so as to realize the optimal control of ammonia injection, overcome the problem of large hysteresis of the control loop in the prior art, and improve the stability of the control system. It has the advantages of good stability, strong anti-interference ability and fast response speed.

Description

technical field [0001] The embodiment of the present invention relates to the field of flue gas denitrification, in particular to a urea pyrolysis denitrification control system. Background technique [0002] Selective catalytic reduction (SCR) is currently the mainstream technology for flue gas denitrification at the tail of thermal power plants. Its principle is that ammonia is injected into the flue as a reducing agent, and under the action of the catalyst, the nitrogen oxides in the flue gas are reduced to nitrogen and water. The main ways to prepare ammonia are the evaporation of liquid ammonia into ammonia, the pyrolysis of urea to produce ammonia, and the hydrolysis of urea to produce ammonia. Due to the high risk of transportation and storage of liquid ammonia, many power plants have gradually changed to urea pyrolysis to produce ammonia. gas. [0003] There are two control modes of the existing urea pyrolysis denitrification control system: a fixed molar ratio con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56G05B11/42
CPCB01D53/8625B01D53/8696B01D53/90B01D2251/2067B01D2258/0283G05B11/42
Inventor 隋海涛郝玉春刘晓哲任旻董璐赵超李修生崔强
Owner YANTAI LONGYUAN POWER TECH
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