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Nitric acid preparation method and device

A nitric acid, production process technology, applied in the direction of nitric acid, nitrogen oxides/oxyacids, nitric oxide, etc., can solve problems such as large axial structure length

Inactive Publication Date: 2010-06-16
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this single-line structure nitric acid production plant is that it requires a relatively large axial structural length

Method used

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  • Nitric acid preparation method and device
  • Nitric acid preparation method and device

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Embodiment Construction

[0023] figure 1 The single-line shafting system is shown schematically in ( Wellenstrang). The single wire shafting 1 is installed in a nitric acid production plant. The single-line shafting system includes a steam turbine 2, a first coupling 3 and a second coupling 4, an air compressor 5, another coupling 6 and another coupling 7, two couplings for compressing nitrogen oxide gas Compressors 8 and 9, coupling 10, coupling 11 and partial gas expander 12. The steam turbine 2 drives the shafting 1 at the left end. Conversely, the partial gas expander 12 drives the shafting 1 at the right end. It can be seen from this that its disadvantage is that such a single-line shafting requires a relatively large installation space.

[0024] figure 2 Another embodiment of part of the plant for nitric acid production is shown in . This part of the plant consists of a steam turbine 2 , two compressors 5 for compressing process air, two partial gas expanders 12 , two nitrogen oxide gas...

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Abstract

The present invention relates to a method and device for preparation of nitric acid comprising a first multi-wave transmission turbo compressor (18) with the processing air and a primary wheel; and the forming process takes place in a second multi-wave transmission turbo compressor (25) with a particle expander. The first compressor and the second compressor are coupled.

Description

technical field [0001] The invention relates to a process for the production of nitric acid by the double pressurization method, wherein in a first low-pressure stage, the ammonia used is combusted with air by means of a compression production process, and in a second stage with a higher pressure than the first stage , At least partially absorb the nitrogen oxide gas produced by the combustion with water, thereby producing nitric acid, in order to obtain the compression work, the remaining gas that is not absorbed is released to the second stage pressure to ambient pressure by the residual gas expander. In addition, the present invention also relates to a device for preparing nitric acid. Background technique [0002] EP 0 945 400 B1 describes materials, mixtures and chemical reaction formulas for the preparation of nitric acid. An important step in this method is the input of air oxygen required for the chemical reaction. For this purpose, the production process is compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/40
CPCC01B21/26C01B21/28
Inventor 莱因哈德·奥里奇
Owner SIEMENS AG