TH8908B - Nitrogen production methods and instruments - Google Patents

Abstract

Methods and instruments for nitrogen production from air separation in production machines. Single column nitrogen The high nitrogen vapor is condensed to form reflux via Vaporization of a stream of highly oxygenated liquid Which will be produced at the bottom of the column. The highly oxygenated stream is partially compressed again in a recycling compressor, cooled and then returned to the column again to increase nitrogen production. As the vapor will partially expand with work. The work of the expansion is used to compress the substrate, the reefer, the stream. Will be produced with nitrogen clicks This will liquefy nitrogen and increase the amount of expansion work which can be used for compression.

Claims (8)

1. Methods for producing nitrogen In which the method consists of Cools the compressed and purified feed air. To get the temperature at Suitable for re-purification (rectification); The compressed and purified feed air is taken into the distillation column to produce high-purity high nitrogen overhead tower. And produce oxygen-containing liquids Tall at the bottom of the column: Condenses at least a portion of the stream with high nitrogen. Containing Tower O Verhead with such high nitrogen. And take the condensation that has arisen in the column Distilled such as reflux Generate a stream of nitrogen products from the rest of the derived Condensation formed Compress the stream recycle. Cool the stream recycling to achieve that temperature. And recycle the stream into the distillation column. To increase the return of production Nitrogen Expand the reeferant stream with work. This will result in a primary reeferant stream and indirect heat exchange between the primary reeferant stream. And such compressed and purified air and recycle the stream. In the amount of such work in the aforementioned compression of the said recycling stream; Vaporizes and then makes the substrate reeferant stream a liquid again. The substrate reeferant stream is partially vaporized. By indirectly exchanging heat with at least parts of the stream with high nitrogen. This facilitates such condensation in the aforementioned high nitrogen streams, and Before the supplying the substrate reefer the stream becomes liquid again, there is an indirect heat exchange between the supplying and the radiant stream. And compressed air And was made such pure And recycle the stream to increase the amount of that work, which can then be used for compression. In addition to that, it can be obtained The pliment of recovery, which is not added and will increase the compression and increase the regeneration of the Such nitrogen products 2. Method according to the aforementioned claim 1: The highly oxygenated fluid stream is extracted from the distillation column. The valve will expand. And through indirect heat exchange with a high nitrogen stream To help Condenses at least part of the aforementioned high nitrogen stream And it will be a high oxygen stream And vaporize Recycling The stream is formed from the highly oxygenated stream segment and vaporizes, and the stream is formed from the remainder of the fluid stream. With high oxygen and vaporize it 3. Claim Method 2, whereby the suppliant reefer can be fully vaporized by an economical heat exchange with an overhead tower with Such high nitrogen 4. Procedure according to claim 3, whereby supplying the reefer rant stream will be It becomes liquefied by compression of the said supplying restorant stream and expanding the second supplying restorant stream. 5. Method for claim 2, where: the nitrogen product consists of Part of what has been obtained from the said condensation And they are divided into 2 types of product streams, one of the said product streams. Will be vaporized throughout the exchange Indirect heat change With such compressed and purified air Another kind of stream of such products is slightly cooled by the official. Exchanging heat indirectly with the sub-diary stream. Which is the compound of the supplying part Menthol Refrigerant Stream, and the aforementioned sub-diary stream will be merged with the rest of the substrate, the Refrigerant Stream before liquefaction. 6. The nitrogen generator consists of a main heat exchanger that is arranged to make the compressed feed air and Purification is cooled to the optimum temperature for re-purification. The distillation column is connected to the main heat exchanger to rectify the compressed and purified feed air. And produces a high nitrogen overhead tower with High purity And the highly oxygenated liquid at the bottom of the column. The condenser head is connected to the distillation column. For at least part condensation Of the highly nitrogen-rich stream containing the aforementioned high nitrogen overhead tower and for re-fluxing the condensate into the distillation column So that the remainder of the condensation can be transported into the stream of the compressor product for the compression of the recycle stream, the main heat exchanger is intervened. Such compressors and such distillation columns In order to recycle, the stream is cooled to Above temperature and put into that distillation column. In order to increase the production return Such nitrogen containers The turbo expander for the expansion of the reeferant stream, along with work to create the prime rifferrant stream, such turbo expander will be connected to the device in the Then the change of heat. In order to allow the primary reeferant stream to indirectly exchange heat with the compressed and purified air. The turbo expander coupling device with the compressor in order to use the volume to compress the recycled stream, and Supplied Menthol Refrigerant Circuits It is used for the circulation of the supplying Menthol Reeve. The gerant stream vaporized during circulation Where the supplying cycle of the region Such includes Head of such condenser Where the head of the condenser is arranged in a similar way that the supply The Mentary Reef Rant, the stream at least partially vaporized by the trade. Indirectly replace heat with at least parts of the above nitrogen-rich stream. The main heat exchange equipment Where the equipment in the exchange The main heat is arranged in such a way that there is an indirect heat exchange between suppositories. Plyenthol, Refrigerant, Stream and Such compressed and purified air To add The amount of work that can be used in such compression In addition to that, it was also supported. Menthol recovery, which has not been added This will increase the compaction and increase the return. Return of nitrogen products, and The cleaning is interpolated between the heat exchanger and the head. Such a condenser in order to allow the supplying Menthol Refrigerant Stream to become liquid again. After being vaporized 7. The nitrogen generator according to claim 6 also consists of: The condenser head is also provided for indirect heat exchange with the stream. For the highly oxygenated liquid, the expansion valve is interpolated between the condenser head and the distillation column. And will make The highly oxygenated stream that vaporizes, the compressor and such turbo expander. Connected to the aforementioned condenser head So that the stream is rotated again. It consists of a highly oxygenated stream of liquid that has been vaporized and a reeferant. The stream contains the remainder of the fluid stream containing High oxygen that vaporizes 8. Nitrogen generator according to claim 6 that the supplying Menthol Refrigerant Stream Liquifyer contains nitrogen factor Which has two turbo expander, working at 2 different temperature levels