CN104976863A - Low-energy-consumption inner compression air separation device and process - Google Patents
Low-energy-consumption inner compression air separation device and process Download PDFInfo
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- CN104976863A CN104976863A CN201510413087.XA CN201510413087A CN104976863A CN 104976863 A CN104976863 A CN 104976863A CN 201510413087 A CN201510413087 A CN 201510413087A CN 104976863 A CN104976863 A CN 104976863A
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Abstract
Disclosed are a low-energy-consumption inner compression air separation device and a process. High-temperature gas is discharged out of the final stage of an axial flow type air compressor or an axial flow centrifugal composite type air compressor; one part of the high-temperature gas passes through a heat exchanger regeneration molecular sieve, and an electric heater or a heat accumulator or a steam heater for regeneration of the molecular sieve is omitted for energy saving; the other part of the high-temperature gas heats a lithium bromide refrigerator for refrigeration, and the lithium bromide refrigerator is used for refrigeration to replace original water chilling units and the like to save electricity. A booster expansion turbine is used for replacing an air compressor to compress and pressurize air, and efficiency is improved. Therefore, the low-energy-consumption inner compression air separation device and the process have the characteristics of being simple in technological process, low in energy consumption, capable of saving energy and increasing efficiency and good in emission reduction effect. The investment of the air separation device can be effectively lowered, production efficiency can be improved, and production cost can be lowered. Economic benefits can be improved, and environmental protection is facilitated.
Description
Technical field
The present invention relates to interior compression air separation device and the flow process of device that a kind of sky divides and flow and method, particularly a kind of low energy consumption, it is applicable to the separation of air.
Background technology
Current world economy is develop rapidly with scientific and technological progress, all trades and professions are all to maximization equipment Development, big steel, large chemical fertilizer, large petrochemical industry, large chemical fibre, large ethene, large aromatic hydrocarbons, great oil refining, large generating (IGCC), large electronics, large note nitrogen recover the oil, large coal gasification, large Coal Chemical Industry etc., and they all need large-scale, ultra-large type air separation plant to serve for it.Such large-scale space division device can only be certainly that Deep Cooling Method continues to monopolize the world, and all generally uses the air separation unit of the Internal-compression flow being with supercharger.
Interior compression is with pump pressure contracting liquid form product, then delivers to outside device after re-heat, gasification.Compression is safer in oxygen comparatively speaking, and especially the high pressure in maximization equipment field, large discharge advantage are more outstanding.
Air separation industry belongs to highly energy-consuming trade, and empty subsidiary factory belongs to big power consumer, and the raw material of air separation plant is air, and what it mainly consumed is the energy, and energy resource consumption accounts for 80% of production cost.For the air separation unit of Internal-compression flow of band supercharger, the air compressor machine that what energy resource consumption was maximum is exactly in air separation plant and supercharger.
Constantly perfect along with market economy, the energy efficiency of air separation plant is more and more taken seriously.Reduce the major measure of production cost and reduce energy consumption exactly, energy-saving and cost-reducing be enterprise security environmental protection, the importance of increasing the benefit, invigorating.
Now by compression air separation device and flow process in a kind of low energy consumption, replace the Internal-compression flow air separation unit of a large amount of band supercharger used now to carry out energy-conservation, synergy, potentiality are very large.And meet now energy-conservation, reduce discharging, the policy of environmental protection.
Summary of the invention
The object of the present invention is to provide a kind of interior compression air separation device and flow process of low energy consumption, it can overcome the deficiency of prior art, not only interior compression air separation device structure is simple, can be declined in like products parameter the comprehensive specific energy consumption of low air separation plant, reduce production cost, and energy-conservation, reduce discharging, environment protecting is good, thus, can effectively enhance productivity and economic benefit.
Its solution is: the interior compression air separation device of low energy consumption comprises: the air compressor be connected with self-cleaning air filter, this air compressor is by being connected with the chilldown system of lithium bromide cooling-water machine group with it and the purification system with dirty nitrogen heat exchanger is connected, and purification system is connected with fractionating column, booster expansion turbine respectively.
Described air compressor is axial flow type air compressor or axial flow centrifugal compound formula air compressor.
The flow process of the interior compression air separation device of employing low energy consumption is:
1, filter the air after removing dust and mechanical admixture through self-cleaning air filter, enter air compressor, by the operating pressure of the medium pressure process of air compressing to 1.0 ~ about 5.0MPa, and discharge high-temperature gas from air compressor final stage.
2, from the high-temperature gas that air compressor final stage is discharged, a part enters chilldown system heating lithium bromide refrigerator for refrigeration, and another part enters purification system and carries out heat exchange as the heating source of dirty nitrogen heat exchanger, heats dirty nitrogen to about 170 degree.And then in the air cooling compressor all entering in chilldown system after cooling, enter molecular sieve adsorber, be used for removing moisture content, carbon dioxide and some hydrocarbons in air, obtain clean and dry air from purification system.
3, be divided into two strands from purification system clean and dry air out, one air directly enters fractionating column, and rectifying participated in by the lower tower entering fractionating column after the main heat exchanger cooling in its ice chest; Another strand of air enters booster expansion turbine pressurized end and carries out supercharging, air after supercharging is recycled water cooling after cooler, then enter after being cooled to-110 degrees Celsius in the main heat exchanger of fractionating column, the expanding end entering booster expansion turbine carries out adiabatic expansion, most of cold needed for compression air separation device in producing, rectifying participated in by the lower tower that the air after expansion enters fractionating column.Obtain the high pure nitrogen gas of pressure at the lower top of tower of fractionating column, obtain the low pure nitrogen gas of pressure at the upper tower top of fractionating column, it is the liquid oxygen of 99.6% that the upper tower bottom of fractionating column obtains purity.Liquid oxygen enters the high pressure main heat exchanger in ice chest after liquid oxygen pump pressurization, is directly sent to user after being pressurized air re-heat to normal temperature.Simultaneously to divide liquid oxygen product to enter liquid storage vessel stand-by for extracting part.Low-pressure nitrogen, dirty nitrogen is cooling box after subcooler, main heat exchanger re-heat, and the nitrogen part after re-heat is sent as gas product.The argon fraction extracted out in the middle part of tower from fractionating column enters bottom crude argon column, and the separation through crude argon column can obtain process argon at its top, then enters the rectifying of pure argon column, can obtain pure liquid argon product at the bottom of tower.Thus oxygen, nitrogen and the argon gas that can effectively isolate in air.
The present invention adopts technique scheme, because application axial flow type air compressor or axial flow centrifugal compound formula air compressor carry out air compressing.It is short that this axial flow type air compressor or axial flow centrifugal compound formula air compressor have air-flow distance, drag losses is less, flow is larger, efficiency is higher than centrifugal compressor, and structure is simple, operation maintenance convenient, do not have middle water cooler (not needing a large amount of recirculated water, cooling tower, water pump etc.), volume little, lightweight, and final stage delivery temperature is high, heat transfer intensity advantages of higher.It is high that the present invention makes full use of above-mentioned air compressor final stage delivery temperature; the feature that heat transfer intensity is high, by the high-temperature gas of discharging from this air compressor final stage, a part is for heating lithium bromide refrigerating mechanism cold; replace original freon handpiece Water Chilling Units, effectively can save electric energy; Another part heats dirty nitrogen to about 170 degree, regenerated molecular sieve as the heating source of heat exchanger, can save regenerating molecular sieve electric heater originally used, storage heater or steam heater, thus reduces equipment investment, reduces costs.Booster expansion turbine is adopted to carry out supercharging, make full use of that booster expansion turbine volume is little, structure is simple, rotor is light, rotating speed is high, efficiency is high, do not need the feature of motor or Steam Turbine Driven, replace original air booster to carry out compressing charge air, can effectively enhance productivity.
In a word, the present invention has that technological process is simple, energy consumption is low, energy-conservation, synergy, the feature that emission reduction effect is good.It can reduce air separation plant used and investment effectively, not only can effectively enhance productivity, and reduces production cost, and, can also increase economic efficiency, be conducive to environmental protection.
Accompanying drawing explanation
Fig. 1 is a kind of interior compression air separation device and flow process simple block diagram of low energy consumption.
Detailed description of the invention
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
In Fig. 1, the interior compression air separation device of low energy consumption comprises: self-cleaning air filter and connected axial flow type air compressor or axial flow centrifugal compound formula air compressor, this axial flow type air compressor or axial flow centrifugal compound formula air compressor by with its be connected with lithium bromide cooling-water machine group chilldown system, have the purification system of dirty nitrogen heat exchanger to be connected, and purification system is connected with fractionating column, booster expansion turbine respectively.
In adopting, the flow process of compression air separation device is
1, after air raw material is sucked in self-cleaning air filter removing dust and mechanical admixture, enter axial flow type air compressor or axial flow centrifugal compound formula air compressor, make full use of described axial flow type air compressor or axial flow centrifugal compound formula air compressor does not have intercooler, the advantage that final stage delivery temperature is high, by the operating pressure of the medium pressure process of air compressing to 1.0 ~ about 5.0MPa, and discharge high-temperature gas from described air compressor final stage.
2, from the high-temperature gas that axial flow type air compressor or axial flow centrifugal compound formula air compressor final stage are discharged, a part enters chilldown system heating lithium bromide refrigerator for refrigeration, another part enters the heating source of purification system as dirty nitrogen heat exchanger, heat dirty nitrogen to about 170 degree, for regenerate adsorber.Then, after this two parts high-temperature gas all enters and cools in the air cooling compressor in chilldown system, enter molecular sieve adsorber absorption, be used for removing the impurity such as moisture content, carbon dioxide and some hydrocarbons in air, thus obtain clean and dry air.The absorber adopted is two, can be used alternatingly, and an absorber is used for adsorbing contaminant, and another absorber is then regenerated by the dirty nitrogen being heated to about 170 degree by heat exchanger.From the clean and dry air that purification system obtains.
3, be divided into two strands from purification system clean and dry air out, one clean and dry air directly enters fractionating column, and rectifying participated in by the lower tower entering fractionating column after the main heat exchanger cooling in its ice chest; Another strand of clean and dry air enters booster expansion turbine pressurized end and carries out supercharging, air after supercharging is recycled water cooling after cooler, then enter after being cooled to-110 degrees centigrade in the main heat exchanger of fractionating column, the expanding end entering booster expansion turbine carries out adiabatic expansion, most of cold in producing needed for compression air separation device, rectifying participated in by the lower tower that the air after expansion enters fractionating column.Obtain the high pure nitrogen gas of pressure at the lower top of tower of fractionating column, obtain the low pure nitrogen gas of pressure at the upper tower top of fractionating column, and the upper tower bottom acquisition purity of fractionating column is the liquid oxygen of 99.6%.Liquid oxygen enters the high pressure main heat exchanger in ice chest after liquid oxygen pump pressurization, is directly sent to user after being pressurized air re-heat to normal temperature.Simultaneously to divide liquid oxygen product to enter liquid storage vessel stand-by for extracting part.Low-pressure nitrogen, dirty nitrogen is cooling box after subcooler, main heat exchanger re-heat, and the nitrogen part after re-heat is sent as gas product.The argon fraction extracted out in the middle part of tower from fractionating column enters bottom crude argon column, and the separation through crude argon column can obtain process argon at its top, then enters the rectifying of pure argon column, can obtain pure liquid argon product at the bottom of tower.Thus oxygen, nitrogen and the argon gas that can effectively isolate in air.
Claims (3)
1. the interior compression air separation device of a low energy consumption, it is characterized in that, the interior compression air separation device of low energy consumption comprises, the air compressor be connected with self-cleaning air filter, this air compressor by with its be connected with lithium bromide cooling-water machine group chilldown system, have the purification system of dirty nitrogen heat exchanger to be connected, and purification system is connected with fractionating column, booster expansion turbine respectively.
2. the interior compression air separation device of low energy consumption as claimed in claim 1, is characterized in that described air compressor is axial flow type air compressor or axial flow centrifugal compound formula air compressor.
3. adopt the empty point flow process of the interior compression of the interior compression air separation device of the low energy consumption described in claims 1 or 2, it is characterized in that, comprise following processing step:
1) filter the air after removing dust and mechanical admixture through self-cleaning air filter, enter air compressor, by the operating pressure of the medium pressure process of air compressing to 1.0 ~ 5.0MPa, and discharge high-temperature gas from air compressor final stage;
2) from the high-temperature gas that air compressor final stage is discharged; a part enters chilldown system heating lithium bromide refrigerator for refrigeration; another part enters the heating source of purification system as dirty nitrogen heat exchanger; heat dirty nitrogen to 170 degree; and then in the air cooling compressor all entering in chilldown system after cooling; enter molecular sieve adsorber again, be used for removing moisture content, carbon dioxide and some hydrocarbons in air, obtain clean and dry air from purification system;
3) be divided into two strands from purification system clean and dry air out, one air directly enters fractionating column, and rectifying participated in by the lower tower entering fractionating column after the main heat exchanger cooling in its ice chest; Another strand of air enters booster expansion turbine pressurized end and carries out supercharging; air after supercharging is recycled water cooling after cooler; then enter after being cooled to-110 degrees Celsius in the high pressure main heat exchanger of fractionating column; the expanding end entering booster expansion turbine carries out adiabatic expansion; most of cold needed for compression air separation device in producing, rectifying participated in by the lower tower that the air after expansion enters fractionating column; The high pure nitrogen gas of pressure is obtained at the lower top of tower of fractionating column; the low pure nitrogen gas of pressure is obtained at the upper tower top of fractionating column; it is the liquid oxygen of 99.6% that the upper tower bottom of fractionating column obtains purity; liquid oxygen enters the high pressure main heat exchanger in ice chest after liquid oxygen pump pressurization; directly be sent to user after being pressurized air re-heat to normal temperature, simultaneously to divide liquid oxygen product to enter liquid storage vessel stand-by for extracting part; Low-pressure nitrogen, dirty nitrogen is cooling box after subcooler, main heat exchanger re-heat, a nitrogen part after re-heat is sent as gas product, the argon fraction extracted out in the middle part of tower from fractionating column enters bottom crude argon column, separation through crude argon column can obtain process argon at its top, enter the rectifying of pure argon column again, pure liquid argon product can be obtained at the bottom of tower, thus effectively can isolate oxygen, nitrogen and the argon gas in air.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106744697A (en) * | 2017-01-17 | 2017-05-31 | 孔祥旭 | A kind of super energy-conservation making oxygen by air separation device |
| CN106958987A (en) * | 2017-03-06 | 2017-07-18 | 浙江大学 | A kind of air pre-dehumidified separated for air and chilldown system |
| CN109297257A (en) * | 2018-09-18 | 2019-02-01 | 苏州制氧机股份有限公司 | A kind of equipment of making nitrogen and its method for preparing nitrogen |
| CN109470061A (en) * | 2018-11-02 | 2019-03-15 | 辽宁新瑞碳材料科技有限公司 | A kind of exhaust gas treating method containing argon of high temperature furnace dry production graphite |
| CN111426148A (en) * | 2019-12-17 | 2020-07-17 | 安徽昊源化工集团有限公司 | Method for reducing air separation energy consumption by utilizing flash evaporation low-pressure steam refrigeration of gasification furnace |
| CN113202588A (en) * | 2021-06-09 | 2021-08-03 | 中国科学院理化技术研究所 | Liquid air energy storage power generation system |
-
2015
- 2015-07-15 CN CN201510413087.XA patent/CN104976863A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106744697A (en) * | 2017-01-17 | 2017-05-31 | 孔祥旭 | A kind of super energy-conservation making oxygen by air separation device |
| CN106958987A (en) * | 2017-03-06 | 2017-07-18 | 浙江大学 | A kind of air pre-dehumidified separated for air and chilldown system |
| CN109297257A (en) * | 2018-09-18 | 2019-02-01 | 苏州制氧机股份有限公司 | A kind of equipment of making nitrogen and its method for preparing nitrogen |
| CN109470061A (en) * | 2018-11-02 | 2019-03-15 | 辽宁新瑞碳材料科技有限公司 | A kind of exhaust gas treating method containing argon of high temperature furnace dry production graphite |
| CN111426148A (en) * | 2019-12-17 | 2020-07-17 | 安徽昊源化工集团有限公司 | Method for reducing air separation energy consumption by utilizing flash evaporation low-pressure steam refrigeration of gasification furnace |
| CN113202588A (en) * | 2021-06-09 | 2021-08-03 | 中国科学院理化技术研究所 | Liquid air energy storage power generation system |
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Application publication date: 20151014 |