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Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace

An automatic setting and control system technology, applied in the direction of control/regulation system, non-electric variable control, nitric acid, etc., can solve the problem that the ratio of ammonia to air and temperature cannot be well matched, hidden dangers in production, etc., to weaken channel interference, Stable system and good performance

Inactive Publication Date: 2016-07-20
CHONGQING UNIV
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Problems solved by technology

[0003] Its disadvantages are obvious. The only way to keep the reaction temperature stable is by changing the input value of the ammonia gas flow. When the temperature reaches the requirement, the actual ammonia input and air flow ratio are often outside the safe production range. The ammonia-to-air ratio and temperature Can't cooperate well, bring hidden trouble to production

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  • Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace
  • Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace
  • Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace

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Embodiment Construction

[0035] The working principle and remarkable effects of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Such as figure 1 As shown, an automatic setting value control system for ammonia air ratio in an oxidation furnace for nitric acid production, including:

[0037] Temperature measuring transmitter, usually connected with the nitric acid production oxidation furnace, used to obtain the real-time temperature T' of the oxidation furnace;

[0038] A temperature controller, usually using a PID controller, is used to measure the deviation e between the real-time temperature T' of the oxidation furnace and the preset temperature T 1 To determine the ammonia flow rate F, the input is the deviation e between the real-time temperature T' of the oxidation furnace and the preset temperature T 1 , the output is the ammonia gas flow F;

[0039] NH 3 A flow measurement transmitter, usually connected t...

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Abstract

The invention provides a control system and a control method for an ammonia-to-air ratio automatic set value in a nitric acid production oxidation furnace. The system compares the real-time temperature of an oxidation furnace with a set temperature value. A temperature controller outputs a required ammonia gas flow. Ammonia gas which enters the oxidation furnace is adjusted through an ammonia gas control valve. For inputting air according to a preset ratio, The flow ratio between the ammonia gas and the air is used as feedback of an air circuit and is compared with the basic set value of the ammonia-to-air ratio. The input amount of the air is adjusted through a variable-frequency blower fan. When temperature offset of the oxidation furnace occurs because of a disturbance to the system, the temperature of the oxidation furnace can be quickly adjusted through changing the ammonia-to-air ratio. An intelligent dynamic ammonia-to-air ratio correction unit outputs the corrected value of the ammonia-to-air ratio according to the temperature offset and change of the temperature offset. The dynamic set value of the ammonia-to-air ratio is formed through overlapping the corrected value of the ammonia-to-air ratio and the basic set value of the ammonia-to-air ratio. The real-time ratio between the ammonia gas flow and the air flow is compared with the dynamic set value of the ammonia-to-air ratio. Through a ratio controller, the air is kept constant in a new ammonia-to-air ratio.

Description

technical field [0001] The invention relates to an automatic control technology in the production process of nitric acid, in particular to an automatic setting value control system and control method for ammonia air ratio in an oxidation furnace for nitric acid production. Background technique [0002] Nitric acid plays an important role in the development of the national economy, and maintaining the stability of the reaction temperature of the nitric acid production oxidation furnace is the key to the stability of the control system. Traditional nitric acid production process: air enters the oxidation furnace after filtration and preheating, keeping the input volume unchanged; liquid ammonia is mixed with air evenly in the oxidation furnace after being gasified and preheated; the mixed gas is heated by the platinum catalyst in the oxidation furnace An exothermic reaction occurs, and the temperature is controlled by changing the flow rate of the input ammonia gas. [0003] ...

Claims

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Application Information

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IPC IPC(8): G05D27/02C01B21/38
CPCG05D27/02C01B21/38
Inventor 左为恒程源李昌春
Owner CHONGQING UNIV
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