Method and device for improving ammoxidation rate of nitric acid manufacture

A technology of ammonia oxidation rate and nitric acid, which is applied in the direction of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of low ammonia oxidation rate, catalyst poisoning, and lower ammonia purification degree, so as to improve ammonia oxidation rate and facilitate inspection and maintenance , Improve the effect of purification

Inactive Publication Date: 2015-04-08
SICHUAN MEIFENG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Reasons for high ammonia consumption are: 1. Poor air quality
In the double pressurized nitric acid process, since the catalytic oxidation reaction of ammonia is carried out under the action of the catalyst, if the air contains impurities such as toxic gas, rust, dust, etc., it is easy to cause catalyst poisoning or the active surface of the catalyst is covered, making the catalyst reduced activity, resulting in low ammonia oxidation rate and high ammonia consumption
After the catalyst is covered and poisoned by dust, in less serious cases, it is not easy to find the problem from the surface of the platinum mesh, and it is often ignored in production. In severe cases, obvious dust can be seen on the surface of the platinum mesh, and the surface of the platinum mesh is dark.
Therefore, the poor air quality is one of the reasons for the high ammonia consumption of the nitric acid plant, and the poor air quality is mainly caused by the poor filtering effect of the air filter
2. The catalyst is polluted by oil
Its disadvantage is that it is only effective for filtering ions above 10 μm, and has almost no filtering effect on ions below 10 μm
3. Cold air ammonia filtration: Domestic nitric acid plants have not yet installed cold air ammonia filters. The low-temperature gas ammonia evaporated from ammonia contains liquid droplets and unseparated oil, which increases the separation and filtration load of hot gas ammonia. After a period of use, the hot gas ammonia filter will be filtered The effect becomes worse, and a higher purification rate cannot be achieved
Affected by the principle of separation, the short residence time of the fluid in the separator, and the high flow rate, the actual output of 3-10% ammonia droplets (not including gaseous ammonia) circulates in the system, reducing the degree of ammonia purification

Method used

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  • Method and device for improving ammoxidation rate of nitric acid manufacture
  • Method and device for improving ammoxidation rate of nitric acid manufacture
  • Method and device for improving ammoxidation rate of nitric acid manufacture

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Embodiment Construction

[0037] Such as Figure 1 to Figure 6Shown: a method for improving the ammonia oxidation rate of nitric acid production, including the following steps, 1) Air filtration: air filtration adopts air purification four-stage dry filtration, selects non-brittle fibers of different thicknesses and dust-removing adhesives with different Filling filter elements, the first stage is made of stainless steel wire mesh, the second and third stage filter elements are made of waterproof ES fiber non-woven fabric, and the material of the fourth stage filter element is made of waterproof polypropylene, which is filled in layers to form a stepped dust filtering method; through the air outlet surface 16 The air outlet goes to the compressor inlet, and the air outlet surface 16 is equipped with an air outlet filter screen 15 to reinforce and prolong the service life, which not only ensures stable filtration efficiency and dust holding capacity, but also increases the strength and reduces the use an...

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Abstract

The invention discloses a method for improving ammoxidation rate of nitric acid manufacture. The method is characterized by comprising the steps: air filtration of four-level dry-type filtration, liquid ammonia filtration using first-level filtration to remove impurity, cool gas ammonia filtration of integrated membrane separation, and hot gas ammonia filtration of integrated membrane separation, so that the impurity in the process gas is separated in high efficiency under the conditions of low temperature, low speed, multi-level, and high precision. The invention further discloses a device for using the method. The device is characterized by comprising an air filter with four-level dry-type filter, a liquid ammonia filter with magnetic SF membrane filter element, and a cool gas ammonia filter and hot gas ammonia filter with integrated membrane separation device. The method is capable of, after improving the purifying degree of the nitric acid manufacture raw material, effectively protecting the catalyst, and improving the ammoxidation rate. Few devices are increased, the purifying is good, and the energy consumption is not increased.

Description

technical field [0001] The invention relates to the field of nitric acid production, in particular to a method and device for improving the ammonia oxidation rate of nitric acid production. Background technique [0002] In the production process of nitric acid, ammonia is consumed as a raw material. In actual production, the ammonia consumption mainly depends on the ammonia oxidation rate. [0003] Reasons for high ammonia consumption are: 1. Poor air quality. In the double pressurized nitric acid process, since the catalytic oxidation reaction of ammonia is carried out under the action of the catalyst, if the air contains impurities such as toxic gas, rust, dust, etc., it is easy to cause catalyst poisoning or the active surface of the catalyst is covered, making the catalyst The activity of ammonia is reduced, resulting in low ammonia oxidation rate and high ammonia consumption. After the catalyst is covered and poisoned by dust, in less serious cases, it is not easy to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/38
Inventor 周泉水刘心强陈春祥廖定友付开林田毅
Owner SICHUAN MEIFENG CHEM IND
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