CN210855275U - High-purity nitrogen purification device - Google Patents
High-purity nitrogen purification device Download PDFInfo
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- CN210855275U CN210855275U CN201921704758.8U CN201921704758U CN210855275U CN 210855275 U CN210855275 U CN 210855275U CN 201921704758 U CN201921704758 U CN 201921704758U CN 210855275 U CN210855275 U CN 210855275U
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Abstract
The utility model relates to a high-purity nitrogen purification device, the device prior art includes a purification tower, two adsorption towers, raw material nitrogen gas inlet pipe inserts the purification tower, the purification tower is connected with two adsorption towers that are connected in parallel through the pipeline, two adsorption towers are used one by one, the purified nitrogen gas output pipeline is connected with the diaphragm compressor and then is connected with the busbar to fill the bottle; the first scheme of the utility model is that a purification tower is added on the basis of the prior art to form a parallel connection of two purification towers, and a running mode of using one for one and standby is also included, wherein a cooler is arranged in an air inlet pipeline of an adsorption tower; the second scheme comprises the addition of two adsorption towers, wherein every two adsorption towers of the four adsorption towers are connected in series to form two groups of adsorption towers connected in parallel, one adsorption tower of the two groups is used and one spare adsorption tower of the two groups, and the second scheme also comprises the step of additionally arranging a cooler in an air inlet pipeline of the second group of adsorption towers; the utility model discloses the device can ensure high-purity nitrogen gas production safety, stable, long period operation, is showing improvement economic benefits.
Description
Technical Field
The utility model belongs to low temperature air separation and liquefaction field especially relates to high-purity gas purification technology and device.
Background
The high-purity nitrogen purification device takes pure nitrogen as raw material gas, after deep purification and adsorption by purification equipment, a high-purity nitrogen product which meets the national standard GB/T8979-2008 is produced through inspection, then the high-purity nitrogen product is compressed and pressurized by a diaphragm compressor, and then the high-purity nitrogen product is filled into bottles through a busbar. In the following statement, high purity nitrogen gas is simply referred to as "high purity nitrogen gas".
The purification equipment in the high-purity nitrogen purification device is key equipment for removing impurity components in the raw material pure nitrogen. The prior art purification equipment consists of a purification tower and an adsorption tower; the purifying equipment has the working principle that firstly, the purifying agent in the purifying tower is used for removing oxygen, methane, hydrogen and hydrocarbon in pure nitrogen, then the molecular sieve in the adsorption tower is used for adsorbing water, carbon dioxide and acetylene in the pure nitrogen, and finally the purified nitrogen is tested, and the subsequent filling process is carried out on the high-purity nitrogen with the purity meeting the national standard.
The purifying agent in the purifying tower of the purifying equipment cannot be recycled in a regeneration mode and can only be replaced periodically; the 13X molecular sieve adsorbent in the adsorption tower of the purification equipment can be recycled by a heating regeneration mode due to the physical characteristics of the 13X molecular sieve adsorbent. Therefore, scientific optimization design of the process flow of the purification equipment is particularly important.
At present, the general process flow of the high-purity nitrogen purification device is schematically shown in the attached drawing 1, and the device comprises a purification tower and two adsorption towers (one is used and the other is regenerated), so that the functions of deep purification and adsorption of pure nitrogen are realized. The purification equipment process flow designs a purification tower, and the purifying agent in the purification tower cannot be recycled by a regeneration method due to the physical characteristics of the purifying agent, and must be replaced periodically, so that the operation period of the high-purity nitrogen purification device is short; meanwhile, when the purifying tower breaks down, the purifying device must be stopped for maintenance; the shutdown of the plant due to these two factors necessarily affects the economics of high purity nitrogen production.
In addition, the raw material pure nitrogen absorbs heat in the process of removing oxygen, methane, hydrogen and hydrocarbon in the purification tower, and the temperature is increased; then, the feed gas purified by the purification tower enters an adsorption tower, the 13X molecular sieve adsorbent in the adsorption tower absorbs heat while adsorbing water, carbon dioxide and acetylene in the feed gas, so that the temperature of the molecular sieve adsorbent is increased, the adsorption capacity is reduced, the adsorption effect is reduced, the working period of the adsorption tower is shortened, the adsorption tower needs to be switched to operate, and at the moment, the 13X molecular sieve adsorbent needs to use self-produced high-purity nitrogen as a regeneration gas source for heating regeneration, so that the operation cost of the whole high-purity nitrogen purification device is increased.
SUMMERY OF THE UTILITY MODEL
The technical scheme I (shown in figure 2) of the high-purity nitrogen purification process of the utility model is as follows: the method comprises the following steps of adding a purification tower on the basis of the prior art, and arranging two purification towers in parallel to form a one-use one-standby operation mode; a cooler E1 is added, and a cooler E1 is arranged between the purification tower and the adsorption tower; the process method of the utility model comprises the following steps: raw material nitrogen enters two purification towers connected in parallel for purification, is cooled by a cooler E1, enters two adsorption towers connected in parallel, is purified by the adsorption towers, and is inspected to be qualified to obtain a high-purity nitrogen product; the two purifying towers and the two adsorption towers are used and prepared, and the uninterrupted work of the high-purity nitrogen purification system is maintained.
Aiming at the physical characteristic that a purifying agent in one purifying tower cannot be recycled by a regeneration method, the purifying tower with the same model is additionally arranged for the purifying equipment, and the two purifying towers are designed to be connected in parallel, so that a 1-in-one operation mode is formed, and the long-period operation of the high-purity nitrogen purifying device is effectively ensured.
The high phenomenon of adsorption tower operating temperature to the purification equipment design adds 1 gas cooler in the adsorption tower admission line behind the purifying column, and gas cooler uses the heat transfer of pure nitrogen gas in cooling water and the adsorption tower admission line, reduces adsorption tower operating temperature. The adsorption temperature of the molecular sieve adsorbent is lower, the physical adsorption efficiency is higher, the adsorption temperature of the molecular sieve adsorbent is reduced by 10 ℃, and the adsorption capacity is improved by not less than 13%, so that the adsorption temperature of the molecular sieve adsorbent is reduced, and the adsorption effect of the molecular sieve adsorbent can be effectively improved. When the working temperature of the 13X molecular sieve adsorbent in the adsorption tower is high, the working period of the adsorption tower is shortened to ensure the adsorption effect, and at the moment, the adsorption tower must be switched to operate, so that the molecular sieve adsorbent is heated and regenerated to recover the adsorption effect. Thereby resulting in an increase in the running cost of the purification apparatus.
The utility model discloses further technical scheme two does (see fig. 3): two adsorption towers are added, every two adsorption towers of the four adsorption towers are connected in series to form two groups of adsorption towers connected in parallel, a cooler E2 is added, and the cooler E2 is arranged between the two adsorption towers connected in series; raw material nitrogen enters a purification tower to be purified and then is cooled through a cooler E1, then enters a first adsorption tower, enters another cooler E2 to be cooled after being purified through the first adsorption tower, enters a second adsorption tower to be further purified after being cooled, and the qualified product of the high-purity nitrogen is obtained after inspection. In order to further improve the adsorption effect, accelerate the cooling time of the molecular sieve adsorbent and improve the adsorption efficiency, a cooler E2 is added, the adsorption process is divided into two times to be completed, the adsorption effect is optimized, and the adsorption is more thorough.
To above-mentioned technical scheme one or two, the utility model discloses further technical scheme does, according to the technology demand one or two gas cooler E1 or E1 and E2 that add are shell and tube heat exchanger, and the design of gas cooler export raw materials pure nitrogen gas temperature is not more than 30 ℃. The purpose of cooling pure nitrogen of the raw material is achieved by exchanging heat between cooling water in the pipe shell and the raw material nitrogen in the pipeline, and the temperature of the nitrogen at the outlet of the gas cooler is ensured to be below 30 ℃.
In order to realize the purification effect more economically and effectively, the utility model discloses the two optimal technical schemes of technical scheme are: four adsorption towers with the same type are configured, and the volume of each adsorption tower is 50% of that of the adsorption tower designed in the original universal type.
The utility model relates to a high-purity nitrogen purification device (see figure 2), which comprises a purification tower and two adsorption towers, wherein a raw material nitrogen inlet pipe is connected into the purification tower, the purification tower is connected with the two adsorption towers in parallel through a pipeline, the two adsorption towers are used and prepared, and a purified nitrogen output pipeline is connected with a diaphragm compressor and then is connected with a busbar for filling bottles; the method is characterized in that: adding a purification tower on the basis of the device, and arranging two purification towers in parallel to form a one-use one-standby operation mode; a cooler E1 is added, and a cooler E1 is arranged between the purification tower and the adsorption tower.
The utility model relates to a further technical scheme (see figure 3) of high-purity nitrogen gas purification device is: two adsorption towers are additionally arranged, every two adsorption towers of the four adsorption towers are connected in series to form two groups of adsorption towers connected in parallel, a cooler E2 is additionally arranged, and a cooler E2 is arranged between the two adsorption towers connected in series; the optimal scheme of the technical scheme is as follows: four adsorption towers with the same type are configured, and the volume of each adsorption tower is 50% of that of the adsorption tower designed in the original universal type.
The utility model relates to a high-purity nitrogen gas purification device, a gas cooler E1 that wherein adds sets up in first adsorption tower inlet line in a set of adsorption tower, and another gas cooler E2 that adds sets up in second adsorption tower inlet line in a set of adsorption tower.
The general process flow of the purification equipment of the high-purity nitrogen purification device is designed into 1 purification tower, and the purifying agent in the purification tower cannot be recycled by a regeneration method due to the physical characteristics of the purifying agent, and must be replaced periodically.
Meanwhile, 2 adsorption towers are designed in the general process flow of the purification equipment of the high-purity nitrogen purification device, and the operation cost of the purification device is high because the working temperatures of pure nitrogen adsorbates and 13X molecular sieve adsorbents of the adsorption towers are high, the working period of the adsorption towers is short, the adsorption towers need to be switched to operate and heated for regeneration. The measures are taken from changing the process flow of the purification equipment of the high-purity nitrogen purification device.
The lower the adsorption temperature of the molecular sieve adsorbent is, the higher the physical adsorption efficiency is, the adsorption temperature of the molecular sieve adsorbent is reduced by 10 ℃, the adsorption capacity is improved by not less than 13%, the adsorption temperature of the molecular sieve adsorbent is reduced, and the adsorption effect of the molecular sieve adsorbent can be effectively improved.
Aiming at the physical characteristic that the purifying agent in 1 purifying tower can not be recycled by a regeneration method, 1 purifying tower with the same model is additionally arranged for the purifying equipment. 2 purification towers are designed to be arranged in parallel, and the purification towers form an operation mode that 1 is used for 1, so that the long-period operation of the high-purity nitrogen purification device is effectively ensured.
Aiming at the phenomenon that the working temperature of an adsorption tower designed by purification equipment is high, 2 gas coolers with the same model are additionally arranged for the purification equipment, and the gas coolers use cooling water to exchange heat with pure nitrogen in an air inlet pipeline of an adsorber, so that the working temperature of the adsorption tower is reduced.
Meanwhile, under the condition that the design loading of the 13X molecular sieve in the adsorption tower is kept unchanged, the 13X molecular sieve is respectively loaded into 4 adsorbers with the same model. Every 2 adsorbers are arranged in series to form 1 group of adsorption towers, so that 2 groups of adsorption towers are formed, 1 group of adsorption towers operates, and 1 group of adsorption towers is regenerated for later use.
The additional 1 gas cooler is arranged in the air inlet pipeline of the first adsorber in the 1 group of adsorption towers and used for reducing the temperature of pure nitrogen in the outlet pipeline of the purification tower and the air inlet pipeline of the first adsorber in the adsorption tower.
The additional 1 gas cooler is arranged in the air inlet pipeline of the second adsorber in the 1 group of adsorption towers and used for reducing the pure nitrogen temperature in the outlet pipeline of the first adsorber and the air inlet pipeline of the second adsorber in the adsorption towers. Therefore, the working period of the adsorption tower is prolonged, and the operation cost of the purification device is reduced.
The schematic diagram of the process flow of the purification equipment of the high-purity nitrogen purification device of the utility model is shown in the attached figure 2.
Drawings
FIG. 1 is a schematic view of a general process flow of a high purity nitrogen purification apparatus.
Fig. 2 is a schematic view of a process flow of the technical scheme of the present invention.
Fig. 3 is a schematic view of a second technical scheme of the present invention.
Description of the symbols of the drawings:
1. a purge column A1; 11. a purge column A2; 2. adsorption column B1; 3. adsorption column B2; 12. a gas cooler E1; 13. a gas cooler E2; 4. a diaphragm type compressor C; 21. adsorption column B11; 22. adsorption column B21; 31. adsorption column B12; 32. adsorption column B22.
Detailed Description
The following will explain the implementation of the technical solution of the present invention in detail with reference to fig. 3:
the utility model discloses implement adsorber lectotype and corresponding pipeline, valve configuration including 2 the same model gas cooler and 4 the same models of addding in the purification equipment process flow to high-purity nitrogen gas purification device.
The process flow of the purification equipment of the high-purity nitrogen purification device which is put into operation in 2018 of a division company of martensite steel gas is taken as an example and is shown in the attached figure 2.
The inlet and outlet gas pipelines and the inlet and outlet valves are configured for the additionally arranged purification towers with the same model, and the model and the material specification of the configured inlet and outlet gas pipelines and the inlet and outlet valves are the same as those of the pipelines and valves configured for the original general purification towers.
The 2 additionally arranged gas coolers with the same model are shell-and-tube heat exchangers, the shell pass is pure nitrogen serving as a raw material, and the tube pass is cooling water.
The temperature of pure nitrogen at the outlet of the gas cooler is designed to be not more than 30 ℃, and the requirement of the operation working temperature of the adsorption tower is completely met. The material of the gas cooler, the gas pipeline and the inlet and outlet valves which are equipped for the gas cooler are all stainless steel materials, so as to meet the production requirement of high-purity nitrogen.
The volume of 4 adsorbers with the same model is selected to be 50% of the volume of the adsorption tower designed by the original universal type, and the requirement of 13X molecular sieve design loading volume can be completely met.
The structure, the material and the design specification of 4 adsorbers with the same model are the same as the technical requirements of the adsorption tower designed by the original general type.
The specific operation method of the purification equipment of the high-purity nitrogen purification device which is put into operation in 2018 by the martensite steel gas company is as follows:
and adjusting the working pressure of the liquid nitrogen storage tank to 0.5MPa, and opening a main air inlet valve of the high-purity nitrogen purification equipment.
The air intake valve and the outlet valve of the cleaning tower a1 used fully open, the air intake valve and the outlet valve of the cleaning tower a2 in the standby state fully closed, the electric heater of the operation cleaning tower a1 and the electric heater of the shutdown cleaning tower a2 are set to operate the cleaning tower a1 and stop the cleaning tower a 2.
Fully opening water inlet valves and water return valves of the gas cooler E1 and the gas cooler E2, putting the gas coolers E1 and E2 into operation, and enabling the temperatures of pure nitrogen at the outlets of the gas cooler E1 and the gas cooler E2 to be less than 30 ℃.
The air inlet valve and the outlet valve of the adsorption tower B11 and the adsorption tower B12 are fully opened, the air inlet valve and the outlet valve of the adsorption tower B21 and the adsorption tower B22 are fully closed, so that the adsorption tower B11 and the adsorption tower B12 are both in an operating state, and the adsorption tower B21 and the adsorption tower B22 are in a shutdown state. And when the on-line analyzer of the high-purity nitrogen purification equipment displays that the value reaches the national standard value of the high-purity nitrogen, starting an air inlet valve of the diaphragm compressor, replacing and starting the diaphragm compressor, and performing high-purity nitrogen bottle filling operation.
The technological process of the purification equipment of the high-purity nitrogen purification device ensures that the high-purity nitrogen purification device runs safely, stably and periodically, improves the economic benefit of high-purity nitrogen production, fully utilizes the existing equipment conditions of the purification device, only needs to add 1 purification tower, 2 gas coolers, corresponding pipelines and valves, and increases little equipment ordering cost.
The utility model discloses the method is clear and definite, and is simple swift, cheap practical, fundamentally can solve high-purity nitrogen gas purification device long period operation, reduce high-purity nitrogen gas manufacturing cost problem well.
The utility model discloses an adsorption tower operating temperature of horse steel high purity nitrogen gas purification device purification equipment is not more than 30 ℃, and purification equipment design rated power 7.7KW.H, life cycle 5 years are superior to domestic and foreign high purity nitrogen gas purification device use general type process flow and with the factory, with the purification equipment 10.5KW.H design rated power, 2 year life cycles of output.
Claims (4)
1. A high-purity nitrogen purification device comprises a purification tower and two adsorption towers, wherein a raw material nitrogen inlet pipe is connected to the purification tower, the purification tower is connected with the two adsorption towers in parallel through an inlet pipeline of the adsorption towers, the two adsorption towers are used for one purpose, and a purified nitrogen output pipeline is connected with a diaphragm compressor and then connected with a busbar for bottle filling; the method is characterized in that: adding a purification tower on the basis of the device, and arranging two purification towers in parallel to form a one-use one-standby operation mode; a cooler E1 is added, and the cooler E1 is arranged in an air inlet pipeline of the adsorption tower.
2. The apparatus of claim 1, wherein: two adsorption towers are additionally arranged, every two adsorption towers of the four adsorption towers are connected in parallel to form two groups of adsorption towers connected in series, and a cooler E2 is additionally arranged in a connecting pipeline behind the first group of adsorption towers.
3. The apparatus for purifying high purity nitrogen gas as claimed in claim 1 or 2, wherein: the one or two additional gas coolers E1 or E1 and E2 are shell-and-tube heat exchangers.
4. The apparatus of claim 2, wherein: the volume of the four adsorption towers with the same model is 50% of the volume of the adsorption tower designed in the original universal type.
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| CN201921704758.8U CN210855275U (en) | 2019-10-12 | 2019-10-12 | High-purity nitrogen purification device |
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| CN201921704758.8U CN210855275U (en) | 2019-10-12 | 2019-10-12 | High-purity nitrogen purification device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526223A (en) * | 2019-10-12 | 2019-12-03 | 马鞍山钢铁股份有限公司 | A kind of high pure nitrogen purifying technique and device |
| CN115215304A (en) * | 2021-04-16 | 2022-10-21 | 无锡市中瑞空分设备有限公司 | Modular nitrogen making machine |
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2019
- 2019-10-12 CN CN201921704758.8U patent/CN210855275U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526223A (en) * | 2019-10-12 | 2019-12-03 | 马鞍山钢铁股份有限公司 | A kind of high pure nitrogen purifying technique and device |
| CN115215304A (en) * | 2021-04-16 | 2022-10-21 | 无锡市中瑞空分设备有限公司 | Modular nitrogen making machine |
| CN115215304B (en) * | 2021-04-16 | 2023-09-19 | 无锡市中瑞空分设备有限公司 | Modularized nitrogen making machine |
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