CN210135445U - Ultra-low temperature liquid cold energy recovery device - Google Patents
Ultra-low temperature liquid cold energy recovery device Download PDFInfo
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- CN210135445U CN210135445U CN201920418124.XU CN201920418124U CN210135445U CN 210135445 U CN210135445 U CN 210135445U CN 201920418124 U CN201920418124 U CN 201920418124U CN 210135445 U CN210135445 U CN 210135445U
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- gasifier
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- coil pipe
- liquid oxygen
- pipe
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- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 238000011084 recovery Methods 0.000 title claims abstract description 11
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000498 cooling water Substances 0.000 claims abstract description 25
- 239000006200 vaporizer Substances 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000001301 oxygen Substances 0.000 claims abstract description 23
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 50
- 238000000034 method Methods 0.000 abstract description 6
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000002309 gasification Methods 0.000 description 10
- 238000000926 separation method Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 241000124033 Salix Species 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- -1 coil pipe Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
An ultra-low temperature liquid cold recovery device comprises a liquid oxygen pump and a gasifier, wherein the inlet of the liquid oxygen pump is connected with a normal-pressure liquid oxygen storage tank, and the outlet of the liquid oxygen pump is connected with at least one pipe of the gasifier through an inlet end valve; the cavity of vaporizer installation multilayer coil pipe forms that coil pipe is inside to be liquid oxygen flow channel, the coil pipe outside is cooling water flow channel, and the cooling water inlet of cooling water flow channel is located the lower part of vaporizer, and the cooling water export is located the upper portion of vaporizer, and the cooling water export passes through the tube coupling pond, and the coil pipe exit linkage oxygen user side of vaporizer. The method has the advantages that the heat exchange between the low-temperature liquid and the circulating water system is utilized, the liquid oxygen is gasified, and meanwhile, the cold quantity is recycled to the circulating water system, so that the aim of reducing the water temperature is fulfilled, and the efficient cyclic utilization of energy is realized; the cold energy of the low-temperature liquid is recycled, the consumption of steam and electric energy is reduced, and the aims of saving energy and reducing consumption are fulfilled.
Description
Technical Field
The utility model relates to a cryrogenic air separation equipment technical field, in particular to cold volume recovery unit of ultra-low temperature liquid.
Background
1. In recent years, with the strong implementation of supply-side reform in China, the productivity of the steel industry is seriously surplus, and the characteristics of high energy consumption and the like of the steel industry naturally become main objects of the reform, under the background, steel enterprises need to reduce the production cost from each link and each process to obtain survival in the reform, and an air separation production unit is used as a main auxiliary production unit in the metallurgical industry and also needs to do cost reduction work from all aspects.
2. In recent years, with the rapid development of the steel industry, the consumption of industrial oxygen is rapidly increased, and the requirement of the air separation plant on the stability of oxygen supply is higher and higher. In order to ensure the stability of oxygen supply when the air separation equipment is in failure and stops, a plurality of units are matched with and build a large liquid oxygen storage tank and a liquid oxygen gasification system, and meanwhile, some units also use the liquid oxygen gasification as a gas supply peak regulation means to reduce the oxygen diffusion rate and the production energy consumption. The liquid gasification gas supply system widely used at present mainly comprises a low-temperature liquid storage tank, a liquid pressure pump, a gasifier and a pipe network system, wherein the gasifier is one of key devices. The currently used gasifier mainly comprises an air-temperature gasifier and a steam-water bath gasifier. The air-heated gasifier is generally made of aluminum alloy, so that the occupied area is large, the monomer evaporation capacity is small, the equipment is easy to damage, and the maintenance and the overhaul are difficult. The steam water bath type gasifier is made of stainless steel, so that the occupied area is small, the monomer evaporation capacity is large, the equipment strength is high, and the maintenance and the overhaul are convenient, therefore, the steam water bath type gasifier is widely applied to iron and steel enterprises.
3. The gasifier of the liquid oxygen gasification system of the willow steel gas company adopts a steam water bath type gasifier which is universal in the industry, steam directly enters the gasifier through a spray head to contact with internal circulating water for heat exchange, the circulating water is heated and then exchanges heat with liquid oxygen immersed in a coil pipe in water, the liquid oxygen in the coil pipe is gasified and then sent out, and the steam is condensed and then discharged through an overflow pipe at the upper part of the gasifier. The set of gasification system plays a great role in production after being built and put into production, and particularly ensures the stability of gas supply under the condition of emergency stop of an air separation plant.
4. The use of the emergency system of the willow steel gas company shows that although the liquid oxygen emergency system is important emergency equipment for abnormal air separation parking, the energy efficiency is not high. Firstly, liquid oxygen is subjected to heat exchange through steam in the gasification process, the liquid oxygen is converted into a gas state (20 ℃) from a liquid state (-180 ℃) and is sent to a pipe network, a large amount of steam is needed in the gasification process, a gas company does not produce the steam, and the steam needs to be purchased from the outside. Secondly, gas companies have a large amount of circulating water to be cooled, and the circulating cooling water is cooled by a fan cooling tower and consumes a large amount of electric energy. If the circulating water that needs to be cooled can be used to vaporize a cryogenic liquid,the steam consumption is reduced, and the water temperature is reduced, so that two purposes are achieved. According to statistics, the liquid gasification amount of the gas company in 2017 is about 6186 km3The total consumption of steam is about 1.40 ten thousand tons, the steam consumption is large, a large amount of cold energy contained in the low-temperature liquid in the heat exchange process is not utilized, if the part of cold energy can be fully utilized, the steam consumption can be reduced, the cold energy of the low-temperature liquid can be recycled, the temperature of circulating water is reduced, and the production cost can be effectively reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize cryogenic liquids and circulating water system's heat exchange, in gasification liquid oxygen, retrieve cold volume to circulating water system again, reach the purpose that reduces the temperature, realized the high-efficient cyclic utilization's of the energy cold volume recovery unit of ultra-low temperature liquid.
The utility model discloses a solution is such:
an ultralow temperature liquid cold recovery device comprises a liquid oxygen pump and a gasifier, wherein an inlet of the liquid oxygen pump is connected with a normal-pressure liquid oxygen storage tank, and an outlet of the liquid oxygen pump is connected with at least one pipe of the gasifier through an inlet end valve; the utility model discloses a gasifier, including vaporizer, coil pipe, cooling water flow channel, cooling water inlet, cooling water outlet, pipeline connection pond, the coil pipe exit linkage oxygen user side of vaporizer, the installation multilayer coil pipe in the cavity of vaporizer forms that the coil pipe is inside to be liquid oxygen flow channel, coil pipe outside for cooling water flow channel, cooling water flow channel's cooling water inlet is located the lower part of vaporizer, and the cooling water outlet is located the upper portion of vaporizer, and the cooling water outlet passes through the tube coupling pond, the coil pipe.
The more specific technical scheme also comprises the following steps: the inside multilayer coil pipe of gasifier is for adopting the different coil pipes of multilayer dish one-tenth diameter, and coaxial cup joints, and the liquid oxygen input tube of coil pipe connects the collector tube, shunts the liquid oxygen that gets into the gasifier to each coil pipe, and the discharge is connected to the output of coil pipe, converges the oxygen that the coil pipe flows and connects the oxygen user side after.
Further: the liquid oxygen input pipe and the oxygen user end of the gasifier are simultaneously provided with the upper end of the gasifier, the liquid collecting pipe is positioned at the lower end of the gasifier, and the gas collecting pipe is positioned at the upper end of the gasifier; the liquid oxygen input pipe extends from the upper end to the lower end of the gasifier and is communicated with a liquid collecting pipe at the lower end.
By adopting the technical scheme, the existing steam water bath type vaporizer can be modified, a steam inlet and an overflow device are omitted, the temperature of the return water of the circulating water is considered to be relatively low, generally at 25-35 ℃, and is about 60-70 ℃ lower than the temperature of the water into which steam is introduced, in order to ensure the heat exchange effect, the heat exchange area of the heat exchanger is properly increased, one emergency pump is adopted to be connected in parallel with 2-3 water bath type vaporizers for use, and if the heat exchange effect is good, a single heat exchange is adopted; on the contrary, multiple heat exchange can be adopted to ensure that the reheated oxygen reaches normal temperature; because the circulating water return water has certain pressure, about 0.25MPa, the water in the original gasifier does not need to be forcibly circulated, and a small water pump of the original gasifier can be eliminated; a circulating water system is transformed, and heads (each provided with a valve) are reserved at a circulating water inlet and outlet header pipe through the opportunity of shutdown of the air separation unit, so that the normal operation of the air separation unit is not influenced in the transformation process.
Among the above-mentioned technical scheme, can install temperature probe at the exit of vaporizer to interlock outlet temperature and the running signal of emergency pump, operating personnel can be on DCS real time monitoring emergency pump's operational aspect, ensure safety.
The utility model has the advantages that:
1. after the steam generator is put into use, the use of the steam is stopped immediately, and the effect is very obvious. The temperature of the liquid oxygen entering the gasifier is-186 ℃ and the temperature of the gas exiting the gasifier is 20 ℃ through actual measurement of an on-site temperature probe, and the operation requirements of the liquid oxygen emergency system are completely met.
2. The cold energy of the low-temperature liquid is recycled, the consumption of steam and electric energy is reduced, and the aims of saving energy and reducing consumption are fulfilled.
3. 283 tons of steam can be saved every month, the unit price of the steam is 135 yuan, the steam cost is saved by 45.8 ten thousand yuan all the year, and the electricity charge cost is saved by 1260 yuan all the year round.
4. If 5 sets of unit emergency systems of the whole plant all adopt the device, the steam use and the circulating small water pump are cancelled, the total cost of the whole plant can be reduced by 189 ten thousand yuan.
5. Because the water yield of heat transfer among the device is less than whole circulation water yield, consequently the reduction of single cold volume recovery unit to the temperature is limited, nevertheless if can promote comprehensively, all emergency system gasification equipment all adopt this device, and then system's circulating water temperature can be effectively reduced, can further practice thrift the circulating water cooling and need the electric energy that consumes.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the gasifier 3.
The reference numbers in the figures are: the system comprises a normal-pressure liquid oxygen storage tank A, an oxygen user side B, a cooling water inlet C, a cooling water outlet D, a liquid oxygen pump 1, an inlet end valve 2, a gasifier 3, a gas collecting pipe 4, a liquid oxygen input pipe 5, a gasifier tank 6, a liquid collecting pipe 7, a first group of coil pipes 8, a second group of coil pipes 9, a third group of coil pipes 10, a fourth group of coil pipes 11 and a fifth group of coil pipes 12.
Detailed Description
As shown in fig. 1, the utility model comprises a liquid oxygen pump 1 and a gasifier 3, wherein the inlet of the liquid oxygen pump 1 is connected with a normal pressure liquid oxygen storage tank A, and the outlet is connected with at least one pipe of the gasifier 3 through an inlet valve 2; the utility model discloses a gasifier, including vaporizer 3, coil pipe, cooling water inlet C, cooling water outlet D, vaporizer 3, the coil pipe exit linkage oxygen user end B who is equipped with multilayer coil pipe in the cavity of vaporizer 3, forms that the coil pipe is inside to be liquid oxygen flow channel, coil pipe outside for cooling water flow channel, cooling water flow channel's cooling water inlet C is located vaporizer 3's lower part, and cooling water outlet D is located vaporizer 3's upper portion, and cooling water outlet D passes through the tube coupling pond, vaporizer 3's coil pipe exit linkage oxygen user.
As shown in fig. 2, the inside multilayer coil pipe of vaporizer 3 cup joints the shaping for adopting the different coil pipes of multilayer dish one-tenth diameter, the liquid collecting tube 7 is connected to the liquid oxygen input tube 5 of coil pipe, liquid oxygen that will get into the vaporizer shunts to each coil pipe, discharge tube 4 is connected to the output of coil pipe, connect oxygen user end B after converging the oxygen that the coil pipe flows out, liquid oxygen input tube 5 of coil pipe connects liquid collecting tube 7, liquid oxygen that will get into the vaporizer shunts to each coil pipe, discharge tube 4 is connected to the output of coil pipe, connect oxygen user end B after converging the oxygen that flows out the coil pipe.
In the embodiment, a first group of coil pipes 8, a second group of coil pipes 9, a third group of coil pipes 10, a fourth group of coil pipes 11 and a fifth group of coil pipes 12 which are different in radial size are coaxially sleeved, each group of coil pipes adopts a structure that two pipes are wound in the same diameter, a liquid oxygen input pipe 5 and an oxygen user end B of a gasifier 3 are simultaneously provided with the upper end of the gasifier 3, a liquid collecting pipe 7 is positioned at the lower end of the gasifier 3, and a gas collecting pipe 4 is positioned at the upper end of the gasifier 3; the liquid oxygen inlet pipe 5 extends from the upper end to the lower end of the vaporizer 3 and is communicated with the liquid collecting pipe 7 at the lower end.
The water after heat exchange of the cold energy recovery device directly returns to the water pool without passing through a cooling tower, and the flow of a single emergency pump is not large, so that the general flow is 10000-15000m3About/h (under standard condition), the cold energy carried by the liquid is limited, the water temperature is not reduced much, and the flow of the water is about 500m3The water flow rate is 1/10 which is about the total circulating water flow rate, so the water valve and the water pipe of the device are selected, the valve and the pipe are not too large and are generally not more than 200mm, otherwise, too much water returns to the water tank through the gasifier, the temperature of the returned water is influenced, if the drift diameter of the valve or the pipe is designed to be too large, the valve needs to work at a small opening degree, the pipe resistance is increased, and the energy consumption loss is caused. Secondly, a thermometer must be arranged at the outlet of the emergency system, the outlet temperature is interlocked with the emergency system, and once the outlet temperature is lower than 0 ℃, the system can be automatically stopped to ensure the safety of the pipeline.
The utility model discloses the theory of operation does: when the emergency system is started, low-temperature liquid is conveyed into the gasifiers by the pump, the low-temperature liquid flows in the pipe, water outside the pipe is returned after air separation cooling of the compressors, the pressure is about 0.25MPa, the temperature is about 25-35 ℃, the water enters the gasifiers from the lower part, after the gasifiers are filled with water, the water flows out from the upper part and is conveyed into a water pool through a pipeline, in order to ensure that the low-temperature liquid can be fully gasified, 2-3 gasifiers can be used in parallel to meet the outlet temperature, valves are arranged at the front and the back of each gasifier, and the gasifiers can be used singly or in multiple sharing modes. The water after heat exchange directly enters the water pool and is not cooled by the fan cooling tower.
Claims (3)
1. The utility model provides an ultra-low temperature liquid cold volume recovery unit which characterized in that: the device comprises a liquid oxygen pump (1) and a gasifier (3), wherein the inlet of the liquid oxygen pump (1) is connected with a normal-pressure liquid oxygen storage tank (A), and the outlet of the liquid oxygen pump is connected with the inside of at least one pipe of the gasifier (3) through an inlet end valve (2); the utility model discloses a gasifier, including vaporizer (3), coil pipe, cooling water inlet (D), cooling water outlet (D), the coil pipe exit linkage oxygen user end (B) of vaporizer (3) is connected through the tube coupling pond, and the coil pipe exit linkage oxygen user end (B) of vaporizer (3) is connected through the tube coupling pond.
2. The ultra-low temperature liquid cold recovery device of claim 1, wherein: the multilayer coil pipe of gasifier (3) inside is for adopting multilayer dish to become the different coil pipes of diameter, and coaxial cup joints, and collector tube (7) are connected in liquid oxygen input tube (5) of coil pipe, and the liquid oxygen that will get into the gasifier shunts each coil pipe, and collector tube (4) are connected to the output of coil pipe, connect oxygen user end (B) after converging the oxygen that the coil pipe flows.
3. The ultra-low temperature liquid cold recovery device of claim 2, wherein: the liquid oxygen input pipe (5) and the oxygen user end (B) of the gasifier (3) are simultaneously provided with the upper end of the gasifier (3), the liquid collecting pipe (7) is positioned at the lower end of the gasifier (3), and the gas collecting pipe (4) is positioned at the upper end of the gasifier (3); the liquid oxygen input pipe (5) extends from the upper end to the lower end of the gasifier (3) and is communicated with a liquid collecting pipe (7) at the lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920418124.XU CN210135445U (en) | 2019-03-29 | 2019-03-29 | Ultra-low temperature liquid cold energy recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920418124.XU CN210135445U (en) | 2019-03-29 | 2019-03-29 | Ultra-low temperature liquid cold energy recovery device |
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| CN210135445U true CN210135445U (en) | 2020-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383040A (en) * | 2022-01-18 | 2022-04-22 | 浙江华健医用工程有限公司 | Vaporization device for saving energy in hospital |
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2019
- 2019-03-29 CN CN201920418124.XU patent/CN210135445U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114383040A (en) * | 2022-01-18 | 2022-04-22 | 浙江华健医用工程有限公司 | Vaporization device for saving energy in hospital |
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Granted publication date: 20200310 |