CN219977194U - System for preheating polluted nitrogen by utilizing waste heat of oxygen production process - Google Patents
System for preheating polluted nitrogen by utilizing waste heat of oxygen production process Download PDFInfo
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- CN219977194U CN219977194U CN202320879454.5U CN202320879454U CN219977194U CN 219977194 U CN219977194 U CN 219977194U CN 202320879454 U CN202320879454 U CN 202320879454U CN 219977194 U CN219977194 U CN 219977194U
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- pipeline
- nitrogen
- circulating water
- compressed air
- side heat
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 66
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000001301 oxygen Substances 0.000 title claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 21
- 239000002918 waste heat Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000010865 sewage Substances 0.000 claims abstract description 29
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 239000004020 conductor Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 239000002808 molecular sieve Substances 0.000 abstract description 11
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 230000001172 regenerating effect Effects 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model relates to a sewage nitrogen preheating system by utilizing waste heat of an oxygen production process, which comprises a heater, a sewage nitrogen pipeline, a non-contact heat conduction device, a compressed air side heat exchanger, an air cooling tower, an air compressor, a water tank, a circulating water pump, a sewage nitrogen gas pipeline, a circulating water pipeline and a compressed air pipeline, wherein the sewage nitrogen pipeline is connected with the heater, the two sewage nitrogen gas pipelines are respectively connected with a sewage nitrogen inlet and a sewage nitrogen outlet of the non-contact heat conduction device and are connected with the sewage nitrogen pipeline in a bypass mode, a cooling water outlet and a cooling water inlet of the non-contact heat conduction device are respectively connected with the compressed air side heat exchanger through the circulating water pipeline, the compressed air side heat exchanger is connected with the air compressor and the air cooling tower through the compressed air pipeline, and the circulating water pipeline is connected with the water tank and the circulating water pump. The utility model can fully utilize the waste heat of the air compressor, reduce the heating energy consumption of the polluted nitrogen gas for regenerating the molecular sieve, reduce the energy consumption of an oxygen-making precooling system and has larger energy-saving potential.
Description
Technical Field
The utility model relates to the field of waste heat utilization in an oxygen production process; in particular to a system for preheating polluted nitrogen by utilizing waste heat of an oxygen production process.
Background
In China, huge energy-saving potential exists in the aspect of low-quality waste heat resource utilization. In the production of oxygen, it is often necessary to heat the contaminated nitrogen gas to regenerate the molecular sieve adsorber, which consumes more energy. In the oxygen production system, the air compressor generates a large amount of heat energy in the compression process, and hot air enters the oxygen production precooling system for cooling, so that the temperature of the air is reduced, and the heat energy is wasted.
If the waste heat of the air compressor can be utilized to preheat the polluted nitrogen gas, the polluted nitrogen gas enters the heater for heating, so that the heating energy consumption of the polluted nitrogen gas can be reduced, the temperature of air entering the precooling system is reduced, the energy consumption of the water chilling unit is reduced, and the energy is saved.
The patent document with the application number 202023174499.8 discloses an air separation heat energy recycling device which comprises a compressor, a dirty nitrogen heat exchanger, 2 electric heaters, 2 adsorbers, an air cooling tower, 2 water filters, 2 water cooling pumps and a muffler. The device exchanges heat with compressed air before entering the air cooling tower through a polluted nitrogen heat exchanger, the compressed air flow is large according to the actual experience of the site, the diameter of a pipeline is about 1 meter, and if only one heat exchanger is used, the volume of the heat exchanger is very large; and the pressure of the inlet polluted nitrogen has the requirement, if the pressure loss is calculated according to the arrangement of a heat exchanger, the pressure drop of the polluted nitrogen side is very large, and the process requirement can not be met.
Disclosure of Invention
The utility model aims to provide a sewage nitrogen preheating system by utilizing waste heat of an oxygen production process so as to save heating cost of sewage nitrogen and energy.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an utilize oxygen process waste heat to preheat dirty nitrogen system, includes heater, dirty nitrogen pipeline, non-contact heat conduction device, compressed air side heat exchanger, air cooling tower, air compressor machine, water tank, circulating water pump, dirty nitrogen gas pipeline, circulating water pipeline, compressed air pipeline, dirty nitrogen pipeline connects the heater, two dirty nitrogen gas pipeline connects non-contact heat conduction device's dirty nitrogen inlet and dirty nitrogen gas outlet respectively to connect dirty nitrogen pipeline with the bypass form, non-contact heat conduction device's cooling water export and cooling water entry are respectively through circulating water pipeline connection compressed air side heat exchanger, compressed air side heat exchanger passes through compressed air pipeline connection air compressor machine and air cooling tower, circulating water pipeline is connected with water tank and circulating water pump.
The non-contact heat conduction device comprises a gas side heat release area, a heat conductor and a water side heat release area, wherein the gas side heat release area is connected with the water side heat release area through the heat conductor, a low-temperature working medium circulates in the heat conductor, the gas side heat release area is connected with a polluted nitrogen gas pipeline, and the water side heat release area is connected with a circulating water pipeline.
The circulating water pump is one-man-one-standby two-branch parallel, and a check valve is arranged at the outlet side of each circulating water pump.
The outlet side of the water tank is provided with a Y-shaped filter, and the water tank is provided with a sewage outlet.
And a pneumatic valve III is arranged on the circulating water pipeline.
A pneumatic valve I is arranged on the dirty nitrogen pipeline between the two dirty nitrogen pipelines, and a pneumatic valve II is also arranged on the two dirty nitrogen pipelines respectively.
Compared with the prior art, the utility model has the beneficial effects that:
1) The utility model can fully utilize the waste heat of the air compressor, reduce the heating energy consumption of the polluted nitrogen gas for regenerating the molecular sieve, reduce the energy consumption of an oxygen-making precooling system and has larger energy-saving potential.
2) The utility model adopts the separated heat exchange device, has small equipment volume, easy installation and small pressure loss in the process of heat exchange of polluted nitrogen, and is particularly suitable for application scenes with limited site positions and compact device layout.
3) The sewage nitrogen side heat exchange device is a non-contact heat conduction device, can effectively prevent water from entering sewage nitrogen when leakage occurs, avoids damaging a molecular sieve, and ensures production safety.
4) The non-contact heat conduction device on the polluted nitrogen side is connected with the polluted nitrogen pipeline and the heater in a bypass mode, and when the device fails, the bypass can be directly cut off, and normal production is not affected.
5) The utility model is provided with the closed water circulation pipeline, and the pressure and flow of the circulating water system can be adjusted by the upper circulating water pump, the water tank and the like, so that the water temperature is kept in a reasonable range, the preheating temperature of the polluted nitrogen gas is improved, and the energy consumption of polluted nitrogen heating is further saved.
Drawings
FIG. 1 is a schematic diagram of a system for preheating polluted nitrogen by utilizing waste heat of an oxygen production process.
Fig. 2 is an enlarged view of the non-contact heat conduction device in fig. 1.
In the figure: the device comprises a 1-polluted nitrogen pipeline 2-a heater 3-an air compressor 4-an air cooling tower 5-a compressed air side heat exchanger 6-a non-contact heat conduction device 7-a polluted nitrogen gas pipeline 8-a compressed air pipeline 9-a circulating water pipeline 10-a water tank 11-a circulating water pump 12-a check valve 13-a Y-type filter 14-a pneumatic valve I15-a pneumatic valve II 16-a water side heat absorption area 17-a pneumatic valve III 18-a heat conductor 19-a sewage drain 20-a gas side heat release area.
Detailed Description
The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. The specific embodiments described herein are to be considered in a descriptive sense only and not for purposes of limitation, the scope of the utility model being so modified.
The utility model provides an utilize oxygen process waste heat to preheat dirty nitrogen system, including heater 2, dirty nitrogen pipeline 1, non-contact heat conduction device 6, compressed air side heat exchanger 5, air cooling tower 4, air compressor machine 3, water tank 10, circulating water pump 11, dirty nitrogen gas pipeline 7, circulating water pipeline 9, compressed air pipeline 8, dirty nitrogen pipeline 1 connects heater 2, dirty nitrogen air inlet and dirty nitrogen gas outlet of non-contact heat conduction device 6 are connected respectively to two dirty nitrogen gas pipelines 7, and connect dirty nitrogen pipeline 1 in the bypass form, the cooling water export and the cooling water entry of non-contact heat conduction device 6 are connected compressed air side heat exchanger 5 through circulating water pipeline 9 respectively, compressed air side heat exchanger 5 passes through compressed air pipeline 8 and connects air compressor machine 3 and air cooling tower 4, circulating water pipeline 9 is closed circulation system, be connected with water tank 10 and circulating water pump 11 above.
The non-contact heat conduction device 6 comprises a gas side heat release area 20, a heat conductor 18 and a water side heat absorption area 16, wherein the gas side heat release area 20 is connected with the water side heat absorption area 16 through the heat conductor 18, the heat conductor 18 is a closed circulation pipeline, low-temperature working media circulate in the heat conductor 18, the gas side heat release area 20 is connected with the polluted nitrogen gas pipeline 7, and the water side heat absorption area 16 is connected with the circulating water pipeline 9.
The circulating water pumps 11 are connected in parallel one by one, and a check valve 12 is arranged on the outlet side of each circulating water pump 11.
A Y-filter 13 is provided on the outlet side of the water tank 10, and the water tank 10 is provided with a drain 19.
The circulating water pipeline 9 is provided with a pneumatic valve III 17.
The pneumatic valve I14 is arranged on the sewage nitrogen pipeline 1 between the two sewage nitrogen pipelines 7, and the pneumatic valve II 15 is also arranged on the two sewage nitrogen pipelines 7 respectively.
The circulating water pump 11 can be adjusted through frequency conversion, so that the pressure of the circulating water system is improved, the flow rate of the circulating water system is adjusted, the temperature of the water side heat absorption area 16 in the sewage nitrogen side non-contact heat conduction device 6 is increased, the preheating temperature of sewage nitrogen gas is further improved, and the sewage nitrogen heating energy consumption is further saved.
The water tank 10 can control the liquid level of the water tank 10 through water supplementing or discharging, and the water tank 10 and the circulating water pump 11 are combined to regulate the temperature of circulating water, so that the heat release amount of compressed air in the whole period of molecular sieve heating-cold blowing and the heat absorption amount balance of polluted nitrogen in the single period of molecular sieve heating are realized, and the liquid vaporization in the water circulating pipeline 9 is prevented.
The non-contact heat conduction device 6 realizes heat transfer through the evaporation-condensation process of the low-temperature working medium in the non-contact heat conduction device; and the heat source and the cold source are not in direct contact, so that moisture is prevented from entering polluted nitrogen and damaging the molecular sieve during leakage.
The non-contact type high-temperature device 6 is connected with the sewage nitrogen pipeline 1 and the heater 2 in a bypass mode, and when the device is in fault, the bypass can be directly cut off, and normal production is not affected.
The specific working process of the sewage nitrogen preheating system by utilizing the waste heat of the oxygen production process is as follows:
1) During normal working state: the molecular sieve is in the heating cycle, and at this time, the pneumatic valve I14 is closed, and the pneumatic valve II 15 is opened. The high-temperature compressed air at the outlet of the air compressor 3 passes through a compressed air side heat exchanger 5 to exchange heat with circulating water, and the compressed air with reduced temperature after heat exchange enters an air cooling tower 4 according to a compressed air pipeline in the original oxygen production system; the circulating water with the increased temperature after heat exchange is sent to the non-contact heat conduction device 6 through the circulating water pipeline 9, and the heat of the circulating water is absorbed through the evaporation of the low-temperature working medium in the circulating water; the low-temperature polluted nitrogen gas conveyed by the polluted nitrogen pipeline 1 enters the non-contact heat conduction device 6 through the polluted nitrogen gas pipeline 7, and is preheated through the condensation heat release of the low-temperature working medium in the non-contact heat conduction device. The polluted nitrogen gas with the increased temperature after heat exchange is sent to the heater 2 through a polluted nitrogen gas pipeline 7 for subsequent heating. The circulating water with the reduced temperature after heat exchange returns to the compressed air side heat exchanger 5 for the heat exchange process of the next cycle under the action of the circulating water pump 11. When the molecular sieve does not need to be heated, the compressed air side can continue to carry out circulating heat exchange, so that the circulating water is heated, and the preparation is made for the next sewage nitrogen heating period.
2) When in failure: the pneumatic valve II 15 is closed, the pneumatic valve I14 is opened, the low-temperature polluted nitrogen gas conveyed by the polluted nitrogen pipeline 1 is conveyed to the heater 2 according to a polluted nitrogen conveying path (polluted nitrogen pipeline 1) of the original oxygen production system, the subsequent heating is carried out, and the heat exchange process of the polluted nitrogen side is stopped. The heat exchange process of the compressed air side is normally carried out, and the high-temperature compressed air at the outlet of the air compressor 3 enters the air cooling tower 4 according to the original compressed air pipeline 8 after heat exchange. At this time, the water tank liquid level can be controlled by discharging the high-temperature water in the water tank and supplementing the low-temperature water, the circulating water temperature can be regulated, and the best heat exchange effect of the compressed air can be ensured.
According to the utility model, the optimal circulating water quantity corresponding to the temperature of different compressed air can be calculated, and the circulating water quantity is controlled by adjusting the frequency of the water pump and the liquid level of the water tank, so that the balance between the heat release quantity of the compressed air in the full period of molecular sieve heating-cold blowing and the heat absorption quantity of the polluted nitrogen in the single period of molecular sieve heating is realized, and the circulating water quantity is kept at the optimal heat exchange temperature. Meanwhile, the circulating water system is boosted through the frequency adjustment of the water pump, so that the temperature of the water side of the non-contact heat conduction device 6 is increased, the temperature of the sewage nitrogen gas outlet is further increased, and the sewage nitrogen heating energy consumption is further saved.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme and the concept of the present utility model, and should be covered by the scope of the present utility model.
Claims (6)
1. The utility model provides an utilize oxygen process waste heat to preheat dirty nitrogen system, its characterized in that includes heater, dirty nitrogen pipeline, non-contact heat conduction device, compressed air side heat exchanger, air cooling tower, air compressor machine, water tank, circulating water pump, dirty nitrogen gas pipeline, circulating water pipeline, compressed air pipeline, dirty nitrogen pipeline connection heater, two dirty nitrogen gas pipeline is connected non-contact heat conduction device's dirty nitrogen air inlet and dirty nitrogen gas outlet respectively to connect dirty nitrogen pipeline with the bypass form, non-contact heat conduction device's cooling water export and cooling water entry are connected compressed air side heat exchanger through the circulating water pipeline respectively, compressed air side heat exchanger passes through compressed air pipeline and connects air compressor machine and air cooling tower, circulating water pipeline is connected with water tank and circulating water pump.
2. The system for preheating polluted nitrogen by utilizing waste heat of an oxygen production process as claimed in claim 1, wherein the non-contact heat conduction device comprises a gas side heat release area, a heat conductor and a water side heat release area, the gas side heat release area is connected with the water side heat release area through the heat conductor, the heat conductor is internally circulated with a low-temperature working medium, the gas side heat release area is connected with a polluted nitrogen gas pipeline, and the water side heat release area is connected with a circulating water pipeline.
3. The system for preheating polluted nitrogen by utilizing waste heat of an oxygen production process as claimed in claim 1, wherein the two circulating water pumps are connected in parallel, and a check valve is arranged at the outlet side of each circulating water pump.
4. The system for preheating nitrogen pollution by using waste heat of oxygen production process according to claim 1, wherein a filter is provided at an outlet side of the water tank, and the water tank is provided with a drain outlet.
5. The system for preheating polluted nitrogen by utilizing waste heat of oxygen production process as claimed in claim 1, wherein the circulating water pipeline is provided with a pneumatic valve III.
6. The system for preheating sewage nitrogen by utilizing waste heat of oxygen production process as claimed in claim 1, wherein a pneumatic valve I is arranged on the sewage nitrogen pipeline between the two sewage nitrogen pipelines, and a pneumatic valve II is also arranged on the two sewage nitrogen pipelines respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320879454.5U CN219977194U (en) | 2023-04-19 | 2023-04-19 | System for preheating polluted nitrogen by utilizing waste heat of oxygen production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320879454.5U CN219977194U (en) | 2023-04-19 | 2023-04-19 | System for preheating polluted nitrogen by utilizing waste heat of oxygen production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219977194U true CN219977194U (en) | 2023-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320879454.5U Active CN219977194U (en) | 2023-04-19 | 2023-04-19 | System for preheating polluted nitrogen by utilizing waste heat of oxygen production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219977194U (en) |
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2023
- 2023-04-19 CN CN202320879454.5U patent/CN219977194U/en active Active
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