CN209877484U - Precooling system for preparing liquid nitrogen - Google Patents
Precooling system for preparing liquid nitrogen Download PDFInfo
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- CN209877484U CN209877484U CN201920526165.0U CN201920526165U CN209877484U CN 209877484 U CN209877484 U CN 209877484U CN 201920526165 U CN201920526165 U CN 201920526165U CN 209877484 U CN209877484 U CN 209877484U
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Abstract
The utility model discloses a precooling system of preparation liquid nitrogen: comprises an air cooling tower and a water cooling tower; a central annular cylinder is arranged in the air cooling tower, the central annular cylinder divides the interior of the air cooling tower into an upper layer cooling tower and a lower layer cooling tower, and the inner bottom of the lower layer cooling tower is communicated with an air inlet pipeline; the water-cooling tower bottom is provided with the cooling inlet channel of intercommunication upper cooling tower, cooler, filter equipment and first cooling water pump have set gradually along the rivers direction on the cooling inlet channel. The utility model discloses a be provided with filter equipment on the external cooling inlet channel of air cooling tower, can carry out filtration treatment with the solid educt in the cooling water, avoided the filler in the solid educt blocking upper air cooling tower and influenced the cooling of air.
Description
Technical Field
The utility model relates to an empty technical preparation liquid nitrogen technical field that divides especially relates to a precooling system of preparation liquid nitrogen.
Background
At present, a cryogenic nitrogen-making air separation precooling system generally precools air by circulating water, and because cooling water contains calcium and magnesium ions, the solubility of the calcium and magnesium ions is reduced along with the reduction of temperature, when the concentration of the calcium and magnesium ions is higher than the solubility at the temperature, the calcium and magnesium ions in the cooling water can scale on the inner wall of an air cooling tower or a filler, so that the filler is blocked, the distribution of air cooling water is uneven, gas and liquid cannot fully exchange heat, and the temperature of the air is increased. Therefore, the machine must be stopped to dredge and clean the filler in the air cooling tower, and the preparation efficiency of the liquid nitrogen is seriously influenced.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the deficiencies in the prior art, the utility model provides a precooling system of preparation liquid nitrogen can effectively prevent the inside packing scale deposit of air cooling tower.
The technical scheme is as follows: in order to achieve the above object, the utility model discloses a precooling system of preparation liquid nitrogen: comprises an air cooling tower and a water cooling tower; a central annular cylinder is arranged in the air cooling tower, the central annular cylinder divides the interior of the air cooling tower into an upper layer cooling tower and a lower layer cooling tower, and the inner bottom of the lower layer cooling tower is communicated with an air inlet pipeline; a cooling water inlet pipeline communicated with an upper-layer cooling tower is arranged at the bottom of the water cooling tower, and a cooler, a filtering device and a first cooling water pump are sequentially arranged on the cooling water inlet pipeline along the water flow direction; the filtering device is arranged on the cooling water inlet pipeline outside the air cooling tower, so that solid precipitates in cooling water can be filtered, and the influence of the solid precipitates on the filler in the upper air cooling tower to air cooling is avoided.
Furthermore, a first filtering screen and a second filtering screen are sequentially arranged in the filtering device along the water flow direction, and filtering holes of the first filtering screen are larger than filtering holes of the second filtering screen; the liquid inlet end of the second filtering screen and the liquid outlet end of the first filtering screen are respectively arranged in a square bulge manner, and the square bulges on the second filtering screen and the first filtering screen are matched; by sequentially arranging the multi-layer filter screen covers with gradually reduced filter holes in the filter device, solid precipitates in the cooling water can be fully filtered.
The section of the central ring cylinder is arranged in an inverted U shape, vent holes are formed in the inner side wall of the upper end of the central ring cylinder in the circumferential direction, and the vent holes are gradually and densely distributed from bottom to top; the vent hole is communicated with the upper-layer cooling tower and the lower-layer cooling tower; a water level sensor is fixedly arranged on the side wall below the vent hole; the water outlet of the central annular cylinder is communicated with the water inlet of the water cooling tower through a cooling water outlet pipeline, and a second cooling water pump is arranged on the cooling water outlet pipeline; the signal output end of the water level sensor is connected with the signal input end of a second cooling water pump; the water level sensor is arranged below the vent hole, so that the cooling water in the central ring cylinder can be prevented from entering the lower-layer air cooling tower from the vent hole, the temperature of the lower-layer circulating water is reduced, and calcium and magnesium ions in the lower-layer circulating water are crystallized and separated out to block the lower-layer filler.
The water outlet of the circulating water pool is communicated with the upper end part of the lower-layer cooling tower through a third precooling liquid inlet pipeline, and a third precooling water pump is arranged on the third precooling liquid inlet pipeline; the bottom water outlet of the lower-layer cooling tower is communicated with the top water inlet of the circulating water tank; and the third precooling water pump drives the circulating water in the circulating water tank to precool the air which just enters the air cooling tower in the lower-layer cooling tower.
Has the advantages that: the utility model discloses a precooling system for preparing liquid nitrogen is provided with the filter equipment on the cooling water inlet pipeline outside the air cooling tower, can carry out filtration treatment to the solid educt in the cooling water, avoids the solid educt from blocking the filler in the upper air cooling tower and influencing the cooling of the air; the multi-layer filtering net covers with gradually-reduced filtering holes are sequentially arranged in the filtering device, so that solid educts in the cooling water can be fully filtered.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the precooling system of the present invention;
FIG. 2 is a schematic cross-sectional view of the central ring of the present invention;
fig. 3 is a schematic sectional structure diagram of the filtering device of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
A pre-cooling system for preparing liquid nitrogen as shown in figures 1-3: comprises an air cooling tower 1 and a water cooling tower 2; a central annular cylinder 13 is arranged in the air cooling tower 1, the central annular cylinder 13 divides the interior of the air cooling tower 1 into an upper-layer cooling tower 11 and a lower-layer cooling tower 12, the inner bottom of the lower-layer cooling tower 12 is communicated with an air inlet pipeline, and an air outlet of the air inlet channel is arranged below a filler in the lower-layer cooling tower 12; the water heater also comprises a circulating water tank 5, wherein normal-temperature water is loaded in the circulating water tank; the water outlet of the circulating water tank 5 is communicated with the upper end part of the lower-layer cooling tower 12 through a third precooling liquid inlet pipeline 6, a third precooling water pump 61 and a control switch are arranged on the third precooling liquid inlet pipeline 6, the water outlet of the third precooling liquid inlet pipeline 6 is arranged above the filler in the lower-layer cooling tower 12, a water distribution sieve is arranged on the water outlet of the third precooling liquid inlet pipeline 6, and water is uniformly sprayed to the filler through the water distribution sieve; the bottom water outlet of the lower-layer cooling tower 12 is communicated with the top water inlet of the circulating water pool 5, circulating water in the circulating water pool 5 is driven to flow downwards above the lower-layer cooling tower 12 through the third precooling water pump 61, air entering the lower-layer air cooling tower 12 moves upwards from bottom to top through the air inlet pipeline, and then gas-liquid exchange heat is carried out at the filler position, so that the air is precooled in the lower-layer air cooling tower 12.
A cooling water inlet pipeline 3 communicated with the upper-layer cooling tower 11 is arranged at the bottom of the water cooling tower 2, and a switch, a cooler 31, a filtering device 32 and a first cooling water pump 33 are sequentially arranged on the cooling water inlet pipeline 3 along the water flow direction; the cooler is conventional refrigeration equipment and can be used for refrigerating a water body. The cooling water contains calcium and magnesium ions, the solubility of the calcium and magnesium ions is reduced along with the reduction of the temperature, when the concentration of the calcium and magnesium ions is higher than the solubility at the temperature, the calcium and magnesium ions in the cooling water can scale on the inner wall or the filler of the air cooling tower, and the solid precipitate in the cooling water can be filtered by arranging the filtering device on the cooling water inlet pipeline outside the air cooling tower, so that the solid precipitate is prevented from blocking the filler in the upper air cooling tower 11 to influence the cooling of air; while cleaning or replacing the external filter unit 32 is more efficient than plugging filler shut down cleaning. Two ends of the filtering device 32 are respectively provided with a filtering cover in a threaded connection way, and the filtering cover is respectively provided with a liquid pipeline communicated with two ends of the filtering cover; the filter device 32 sequentially comprises a first filter screen 321 and a second filter screen 322 along the water flow direction, and the filter holes of the first filter screen 321 are larger than the filter holes of the second filter screen 322; the solid educts in the cooling water are filtered step by step through the matching use of the first filter screen cover 321 and the second filter screen cover 322, thus not only ensuring the filtering effect of the filtering device 32, but also avoiding the solid educt from being blocked frequently due to the undersize filtering holes, reducing the frequency of cleaning or replacing the filtering device 32, the liquid inlet end of the second filter screen 322 and the liquid outlet end of the first filter screen 321 are respectively arranged in a square protrusion, the square bulges on the two are matched with each other, so that the water outlet area of the liquid outlet end of the first filter screen cover 321 and the water inlet area of the second filter screen cover 322 are increased, therefore, the contact area between the liquid outlet end of the first filter screen 321 and the liquid inlet end of the second filter screen 322 is greatly increased, and the speed of the cooling water entering the second filter screen 322 is reduced due to the influence of solid educts blocked at the liquid outlet end of the first filter screen 321 and the liquid inlet end of the second filter screen 322.
The section of the central annular cylinder 13 is in an inverted U-shaped arrangement, the circumference of the inner side wall of the upper end of the central annular cylinder 13 is provided with vent holes 131, and the vent holes 131 are gradually and densely distributed from bottom to top, so that the possibility that cooling water in the central annular cylinder 13 enters the lower-layer air cooling tower 12 from the vent holes 131 is reduced while air can effectively pass through the central annular cylinder 13; the vent hole 131 is communicated with the upper-layer cooling tower 11 and the lower-layer cooling tower 12, and air in the lower-layer air cooling tower enters the upper-layer air cooling tower from the vent hole; a water level sensor 132 is fixedly arranged on the side wall below the vent hole 131; the water outlet of the central annular cylinder 13 is communicated with the water inlet of the water cooling tower 2 through a cooling water outlet pipeline 4, and a second cooling water pump 41 is arranged on the cooling water outlet pipeline 4; the signal output end of the water level sensor 132 is connected with the signal input end of the second cooling water pump 41; when the water level sensor 132 is immersed in the water surface in the central annular cylinder 13, the water level sensor 132 sends an electric signal to control the second cooling water pump 41 to work to pump the cooling water in the central annular cylinder 13 out of the air cooling tower 1, so that the cooling water in the central annular cylinder 13 is prevented from entering the lower-layer air cooling tower 12 from the vent hole 131, the temperature of the lower-layer circulating water is reduced, and calcium and magnesium ions in the central annular cylinder are crystallized and separated out to block the lower-layer filler; the cooling water in the central ring barrel 13 is pumped out and stopped by the second cooling water pump 41.
The low-temperature waste nitrogen gas coming out of the cold box is arranged below the filler of the water cooling tower 2, the water outlet end of the cooling water outlet pipeline 4 is arranged above the filler of the water cooling tower 2, the low-temperature waste nitrogen gas moves from bottom to top in the water cooling tower 2, the cooling water moves from top to bottom in the water cooling tower 2, and gas-liquid temperature exchange is carried out in the filler on two sides, so that the temperature of the cooling water is reduced, and the cooling water is cooled to the required temperature in the cooler 31, and the energy consumption is less.
The above description is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (4)
1. A precooling system for preparing liquid nitrogen is characterized in that: comprises an air cooling tower (1) and a water cooling tower (2); a central annular cylinder (13) is arranged in the air cooling tower (1), the central annular cylinder (13) divides the interior of the air cooling tower (1) into an upper-layer cooling tower (11) and a lower-layer cooling tower (12), and the inner bottom of the lower-layer cooling tower (12) is communicated with an air inlet pipeline; the water cooling tower (2) bottom is provided with cooling water inlet pipe (3) of intercommunication upper cooling tower (11), along rivers direction set gradually cooler (31), filter equipment (32) and first cooling water pump (33) on cooling water inlet pipe (3).
2. A pre-cooling system for preparing liquid nitrogen according to claim 1, wherein: the filter device (32) sequentially comprises a first filter screen (321) and a second filter screen (322) along the water flow direction, and the filter holes of the first filter screen (321) are larger than those of the second filter screen (322); the liquid inlet end of the second filtering net cover (322) and the liquid outlet end of the first filtering net cover (321) are respectively arranged in a square bulge mode, and the square bulges on the second filtering net cover and the first filtering net cover are arranged in a matched mode.
3. A pre-cooling system for preparing liquid nitrogen according to claim 1, wherein: the section of the central ring cylinder (13) is arranged in an inverted U shape, vent holes (131) are formed in the inner side wall of the upper end of the central ring cylinder (13) in the circumferential direction, and the vent holes (131) are gradually and densely distributed from bottom to top; the vent hole (131) is communicated with the upper-layer cooling tower (11) and the lower-layer cooling tower (12); a water level sensor (132) is fixedly arranged on the side wall below the vent hole (131); the water outlet of the central annular cylinder (13) is communicated with the water inlet of the water cooling tower (2) through a cooling water outlet pipeline (4), and a second cooling water pump (41) is arranged on the cooling water outlet pipeline (4); and the signal output end of the water level sensor (132) is connected with the signal input end of the second cooling water pump (41).
4. A pre-cooling system for preparing liquid nitrogen according to claim 1, wherein: the cooling tower further comprises a circulating water tank (5), a water outlet of the circulating water tank (5) is communicated with the upper end part of the lower-layer cooling tower (12) through a third precooling liquid inlet pipeline (6), and a third precooling water pump (61) is arranged on the third precooling liquid inlet pipeline (6); and a water outlet at the bottom of the lower-layer cooling tower (12) is communicated with a water inlet at the top of the circulating water pool (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920526165.0U CN209877484U (en) | 2019-04-18 | 2019-04-18 | Precooling system for preparing liquid nitrogen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920526165.0U CN209877484U (en) | 2019-04-18 | 2019-04-18 | Precooling system for preparing liquid nitrogen |
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| CN209877484U true CN209877484U (en) | 2019-12-31 |
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| CN201920526165.0U Active CN209877484U (en) | 2019-04-18 | 2019-04-18 | Precooling system for preparing liquid nitrogen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944806A (en) * | 2021-03-11 | 2021-06-11 | 杭州制氧机集团股份有限公司 | Air separation pre-cooling system |
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2019
- 2019-04-18 CN CN201920526165.0U patent/CN209877484U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944806A (en) * | 2021-03-11 | 2021-06-11 | 杭州制氧机集团股份有限公司 | Air separation pre-cooling system |
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