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Spiral thick nitric acid bleaching tower and preparation of thick nitric-acid

A concentrated nitric acid and bleaching tower technology, applied in the field of preparing concentrated nitric acid, can solve the problems of short service life of equipment, large gas phase and liquid phase flow resistance, small production capacity, etc. The effect of increasing body strength

Inactive Publication Date: 2005-09-07
SICHUAN LUTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of concentrated nitric acid bleaching tower has the following deficiencies in actual production: first, there are many internal parts and heavy weight; second, the internal parts are unstable, which may easily cause equipment failure; Dead angle, acid storage, cleaning and maintenance are unsafe; fourth, due to the poor fluidity of nitric acid in the equipment, the heat transfer effect is relatively poor; fifth, the service life of the equipment is relatively short; sixth, the flow resistance of gas and liquid phases is large, and the production capacity Small

Method used

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  • Spiral thick nitric acid bleaching tower and preparation of thick nitric-acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: with reference to attached figure 1 . The spiral concentrated nitric acid bleaching tower includes an upper tower 8, and a nitric acid liquid collector distributor 1 is respectively arranged on the upper and middle parts of the inner cylinder 3 of the lower tower. The liquid collector distributor 1 consists of a circular shell and a cover plate through the rib plate It is welded, and there is a gap between the cover plate and the cone shell for the passage of nitrogen oxide gas. The bottom of the cone is connected to the inner cylinder of the lower tower, and there are several gaps for the passage of nitric acid. The bottom of the liquid collector distributor 1 is a spiral plate 2. There is an angle between the spiral plate 2 and the inner wall of the lower tower inner cylinder 3 and forms a nitric acid flow channel. The lower port of the lower tower inner cylinder 3 is the finished concentrated nitric acid outlet 6. The inner cylinder 3 of the lower towe...

Embodiment 2

[0017]Embodiment 2: the preparation method of concentrated nitric acid, the concentrated nitric acid that contains 25%~30% nitrogen oxides, and concentration is 99%, enters the lower tower inner cylinder behind the last sieve plate of the upper tower, and at first the nitric acid is distributed through the liquid collector distributor into the spiral plate flow channel to make it flow from top to bottom along the spiral flow channel. During the process of flowing down the spiral flow channel, the nitric acid continuously exchanges heat with the steam in the steam heating jacket. After the nitric acid is heated, the The nitrogen oxides are continuously decomposed, and the decomposed nitrogen oxide gas flows upwards and enters the upper tower through the liquid collector distributor, while the nitric acid is collected and distributed in the middle of the inner cylinder of the lower tower through the liquid collector distributor. into the spiral plate flow channel below it, so tha...

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Abstract

The present invention relates to a method for preparing concentrated nitric acid and its equipment, which comprises upper tower, upper portion and middle portion of inner cylinder of lowre tower are respectively equipped with a nitric acid collecting distributor, under the collecting distributor a spiral plate is set, between the spiral plate and inner wall of inner cylinder of the lower tower an included angle is formed, and make into the flow channel of the nitric acid, and the inner cylinder of lower tower is equipped with a steam heating jacket. Said equipment has the following advantages: simple structure, high cylinder body strength, reduced corrosion, stable operation, high heat-conductive efficiency and low energy consumption, etc.

Description

Technical field: [0001] The invention relates to a method and equipment for preparing concentrated nitric acid, belonging to the field of direct nitric acid preparation concentrated nitric acid. Background technique: [0002] At present, most of the bleaching towers for the production of concentrated nitric acid by the direct nitric acid method are sieve plate towers on the upper tower, bubble cap towers on the lower tower, and high-purity aluminum towers connected by flanges or welding in the middle. The lower tower is equipped with 15 layers of bubble caps inside and a steam heating jacket on the outside. The total weight of the lower tower is 1680 kg, of which 555 kg are movable assemblies. This kind of concentrated nitric acid bleaching tower has the following deficiencies in actual production: first, there are many internal parts and heavy weight; second, the internal parts are unstable, which may easily cause equipment failure; Dead angle, acid storage, cleaning and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/38C01B21/46
Inventor 周启红余额江义学陶洪罗宏邓良键
Owner SICHUAN LUTIANHUA