A kind of ignition method of ammonia oxidation method to produce nitric acid

A technology of ammonia oxidation and nitric acid, applied in the direction of nitrogen oxides/oxyacids, nitric acid, etc., can solve the problems of low operator skills, lack of ignition conditions, environmental pollution, etc., to avoid air pollution and shorten driving time , high precision effect

Active Publication Date: 2016-06-08
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, the matching time sometimes exceeds 60 minutes due to lack of ignition conditions, failure of the adjustment system, and low operating skills of the operators, resulting in serious environmental pollution accidents.

Method used

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  • A kind of ignition method of ammonia oxidation method to produce nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Installation of ignition equipment

[0044] (1) Connect the air compressor to the ammonia-air mixer through the air pipeline, install air flow temperature compensation 1, air flow pressure compensation 2 and air flow meter 3, air flow temperature compensation 1 and air flow pressure compensation 2 in the air pipeline The output ends of the air flow meter are respectively connected to the input ends of the air flow meter 3, and the output ends of the air flow meter 3 are connected to the input ends of the ratio regulator 11;

[0045] (2) Connect the ammonia superheater to the ammonia filter through the ammonia gas pipeline, and then connect it to the ammonia-air mixer. Install the gas ammonia pressure regulating valve B4 from the ammonia gas pipeline at one end of the ammonia superheater, and the gas ammonia flow pressure compensation is 5 , gas ammonia flow temperature supplement 6, gas ammonia flow meter 7, gas ammonia flow regulating valve 8 and emergency shut-off ...

Embodiment 2

[0070] The DCS sets the automatic gradual change mode of the gas ammonia flow regulating valve 8 to make the ammonia / air ratio reach 8.5% molar content within 2.5 minutes, and the molar content ratio rises from 0% to 7% in the first 1.5 minutes, and then in the next 1 minute Within 5 minutes, the molar content rose to 8.5% from 7%, and then the ammonia / air ratio was adjusted to 9.5% molar content in 5 minutes. All the other were the same as in Example 1.

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Abstract

The invention discloses an ignition method for producing nitric acid through an ammonia oxidation process. The ignition method comprises the following steps: setting a normal ammonia and air ratio value in a ratio controller to be the molar content being 9.5-10.5 percent, and setting an ammonia and air ratio interlocking value to be the molar content being 11 percent; and setting the automatic gradual-change mode of an ammonia flow regulating valve to be characterized in that the ammonia / air ratio reaches the molar content being 8.5 percent in 2.0-2.5 minutes by DCS, wherein the ratio molar content is increased from 0 percent to 7 percent in the first 2 minutes, the molar content is increased from 7 percent to 8.5 percent within 1 minute, and the ammonia / air ratio is adjusted to be the molar content being 9.5 percent within 5 minutes. The ignition method disclosed by the invention has the advantages that the nitric acid feeding ignition safety requirement is met, and the environmental pollution is avoided.

Description

technical field [0001] The invention belongs to an ignition method for producing nitric acid by an ammonia oxidation method. Background technique [0002] At present, the nitric acid production facilities in the world and at home all belong to the method of producing nitric acid by ammonia contact oxidation method, and all have the process of preparing mixed gas according to a certain ratio of ammonia and air. Because the ammonia concentration in the ammonia-air mixture reaches a certain range and has the characteristics of explosion, according to theoretical calculations, the maximum concentration of ammonia in the mixture is 14.4% (mol), and the normal control ratio of ammonia to the mixture is 9.5-11.5% ( mol) range. The control of ammonia / empty ratio in nitric acid production is very important, and it is the most critical control point in nitric acid production. It is designed with 8% low reporting, 10.5% high reporting, and 11% high interlocking stop functions. Once in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/38
Inventor 王全文孙林杨璐叶瑛刘军彪
Owner SEDIN ENG
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