CN211178054U - Formic acid internal circulation cooling system - Google Patents
Formic acid internal circulation cooling system Download PDFInfo
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- CN211178054U CN211178054U CN201921802425.9U CN201921802425U CN211178054U CN 211178054 U CN211178054 U CN 211178054U CN 201921802425 U CN201921802425 U CN 201921802425U CN 211178054 U CN211178054 U CN 211178054U
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- formic acid
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Abstract
The utility model discloses a formic acid inner circulation cooling system, including desalinized water cooling system and circulating water cooling system, wherein, desalinized water cooling system is including the cold medium passageway of the desalinized water storage tank, desalinized water pump and the desalinized water heat exchanger that connect gradually, and the hot medium passageway of desalinized water heat exchanger is used for being connected with gaseous formic acid source, and the cold medium passageway export of desalinized water heat exchanger is connected with the desalinized water storage tank; the circulating water cooling system comprises a water cooling tower, a circulating water pump and a cold medium channel of the heat exchanger which are connected in sequence, and the outlet of the cold medium channel of the heat exchanger is connected with the water cooling tower; the heat medium channel of the heat exchanger is connected between the desalted water pump and the desalted water heat exchanger. The cooling system can better overcome the influence of scaling of heat exchange equipment and improve the heat exchange efficiency.
Description
Technical Field
The utility model belongs to circulating water cooling field, in particular to formic acid desalination water inner circulation cooling system. The device is suitable for production devices which are easy to cause serious scaling of heat exchangers due to poor quality of cooling water and easy to block cooling water pipelines below DN25, and is particularly suitable for application of high-temperature heat exchangers of formic acid devices and pump cooling water.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
The production process of formic acid generally comprises 4 process routes of a sodium formate method, a formamide method, a butane liquid-phase oxidation method and a methyl formate hydrolysis method, after the formic acid is prepared, the prepared formic acid needs to be rectified and purified due to high impurity content, the formic acid is distilled from the top of a rectifying tower, the temperature of the gas-phase formic acid is generally higher than 150 ℃, and the gas-phase formic acid needs to be cooled, condensed into liquid and stored.
At present, circulating water is generally introduced into a formic acid gas phase cooler, the temperature of the circulating water is below 30 ℃, the temperature difference between two sides of the cooler is large, the scaling phenomenon of the tube wall of a heat exchanger is easy to occur, the heat exchange effect is influenced, and then the condensation, temperature reduction and liquefaction of formic acid are influenced. Moreover, as the quality of the circulating water is poor, more suspended particles exist in the circulating water, and when the circulating water pipeline is fine, the blockage is easy to occur, so that the pump body is over-temperature, and the normal operation is influenced.
Disclosure of Invention
In order to solve the technical problem that exists among the prior art, the utility model aims at providing a formic acid inner loop cooling system, this cooling system can overcome the influence of indirect heating equipment scale deposit betterly, improves heat exchange efficiency.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an internal circulation cooling system for formic acid comprises a desalted water cooling system and a circulating water cooling system, wherein,
the desalted water cooling system comprises a desalted water storage tank, a desalted water pump and a cold medium channel of a desalted water heat exchanger which are sequentially connected, wherein a heat medium channel of the desalted water heat exchanger is used for being connected with a gas-phase formic acid source, and an outlet of the cold medium channel of the desalted water heat exchanger is connected with the desalted water storage tank;
the circulating water cooling system comprises a water cooling tower, a circulating water pump and a cold medium channel of the heat exchanger which are connected in sequence, and the outlet of the cold medium channel of the heat exchanger is connected with the water cooling tower;
the heat medium channel of the heat exchanger is connected between the desalted water pump and the desalted water heat exchanger.
Adopt the desalinized water to cool down the condensation to gaseous formic acid among this formic acid cooling system, because the scale deposit ion in the desalination has got rid of, and the solid particulate matter in the desalination is less, so when cooling down gaseous formic acid, can not produce serious scale deposit phenomenon, guarantee the cooling effect of formic acid.
Set up circulating water cooling system, can cool down the desalinized water after the heat transfer, guarantee the cooling condensation effect of gaseous phase formic acid.
In some embodiments, the number of the desalted water heat exchangers is at least 2, and the desalted water heat exchangers are arranged in parallel.
In some embodiments, the heat exchanger is a horizontal structure and comprises a shell and a plurality of heat exchange tubes, wherein the shell is internally provided with a plurality of baffle plates, the heat exchange tubes are arranged in the shell in a snake shape, the heat exchange tubes form heat medium channels, and a cold medium channel is enclosed between the shell and the heat exchange tubes.
The baffle plate can baffle the circulating water in the shell, so that the flowing time of the circulating water in the shell of the heat exchanger is prolonged, and sufficient heat exchange is ensured. Desalted water flows in the heat exchange tubes, and the heat exchange tubes are arranged in a snake shape, so that the retention time of the desalted water in the heat exchanger can be prolonged, and the cooling effect of the desalted water is ensured.
Further, the overall flow direction of the hot medium channel is opposite to that of the fluid in the cold medium channel. By adopting the mode, the temperature difference between the inner side and the outer side of the heat exchange tube can be reduced, the scaling phenomenon of circulating water is further reduced, and the effect of reducing the temperature of desalted water is favorably improved.
Furthermore, the circulating water and the desalted water are both introduced into the heat exchanger from the bottom of the heat exchanger.
In some embodiments, the outlet of the water cooling tower is provided with a first filter, and the circulating water flows to the heat exchanger after being filtered.
The filter can remove suspended solid particles in the circulating water, and prevent the solid particles from depositing in the pipeline to block the pipeline.
Furthermore, a slag discharge port is arranged at the bottom of the water cooling tower. When the circulating water runs for a period of time, the circulating water is filtered by the filter, so that more solid slag stays in the water cooling tower, the operation is stopped for a period of time, and after the solid slag is fully settled, the slag discharge port is opened for discharging.
In some embodiments, the water cooling tower is connected with a circulating water replenishing pipeline.
Furthermore, a second filter is connected to the circulating water replenishing pipeline. After the circulating water is filtered by the second filter, solid impurities in the circulating water can be reduced preliminarily, and the load of a subsequent filter is reduced.
In some embodiments, a desalted water replenishing pipeline is connected to the desalted water cooling system. Used to replenish the depleted water.
The utility model has the advantages that:
adopt the desalinized water to cool down the condensation to gaseous formic acid among this formic acid cooling system, because the scale deposit ion in the desalination has got rid of, and the solid particulate matter in the desalination is less, so when cooling down gaseous formic acid, can not produce serious scale deposit phenomenon, guarantee the cooling effect of formic acid.
Set up circulating water cooling system, can cool down the desalinized water after the heat transfer, guarantee the cooling condensation effect of gaseous phase formic acid.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Wherein: 1. the system comprises a desalted water replenishing pipeline, 2, a desalted water pipeline, 3, a desalted water heat exchanger, 4, a desalted water storage tank, 5, a desalted water pump, 6, a heat exchanger, 7, a circulating water pump, 8, a circulating water pipeline, 9, a cooling tower and 10, a circulating water replenishing pipeline.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the formic acid internal circulation cooling system comprises a desalted water cooling system and a circulating water cooling system, wherein,
the desalted water cooling system comprises a desalted water storage tank 4, a desalted water pump 5 and a cold medium channel of a desalted water heat exchanger 3 which are sequentially connected, wherein a heat medium channel of the desalted water heat exchanger 3 is used for being connected with a gas phase formic acid source, and an outlet of the cold medium channel of the desalted water heat exchanger 3 is connected with the desalted water storage tank 4; the number of the desalted water heat exchangers 3 is at least 2, such as 2, 3, 4, 5 or even more, and the desalted water heat exchangers 3 are arranged in parallel. The desalted water heat exchanger is used for cooling and condensing gas-phase formic acid.
The circulating water cooling system comprises a water cooling tower 9, a circulating water pump 7 and a cold medium channel of the heat exchanger 6 which are connected in sequence, and the outlet of the cold medium channel of the heat exchanger 6 is connected with the water cooling tower 9; the water cooling tower 9 is a device for cooling the circulating water in the prior art.
The heat medium channel of the heat exchanger 6 is connected between the desalted water pump 5 and the desalted water heat exchanger 3, the heat exchanger 6 is of a horizontal structure and comprises a shell and a plurality of heat exchange tubes, a plurality of baffle plates are arranged in the shell, the heat exchange tubes are arranged in the shell in a snake shape, the heat exchange tubes form the heat medium channel, and a cold medium channel is enclosed between the shell and the heat exchange tubes.
The baffle plate can baffle the circulating water in the shell, so that the flowing time of the circulating water in the shell of the heat exchanger is prolonged, and sufficient heat exchange is ensured. Desalted water flows in the heat exchange tubes, and the heat exchange tubes are arranged in a snake shape, so that the retention time of the desalted water in the heat exchanger can be prolonged, and the cooling effect of the desalted water is ensured. Adopt the desalinized water to cool down the condensation to gaseous formic acid among this formic acid cooling system, because the scale deposit ion in the desalination has got rid of, and the solid particulate matter in the desalination is less, so when cooling down gaseous formic acid, can not produce serious scale deposit phenomenon, guarantee the cooling effect of formic acid.
The hot medium channel and the cold medium channel are opposite in flow direction as a whole. By adopting the mode, the temperature difference between the inner side and the outer side of the heat exchange tube can be reduced, the scaling phenomenon of circulating water is further reduced, and the effect of reducing the temperature of desalted water is favorably improved. And circulating water and desalted water are introduced into the heat exchanger from the bottom of the heat exchanger.
Set up circulating water cooling system, can cool down the desalinized water after the heat transfer, guarantee the cooling condensation effect of gaseous phase formic acid.
The outlet of the water cooling tower 9 is provided with a first filter, and circulating water flows to the heat exchanger after being filtered. The filter can remove suspended solid particles in the circulating water, and prevent the solid particles from depositing in the pipeline to block the pipeline. The bottom of the water cooling tower is provided with a slag discharge port. When the circulating water runs for a period of time, the circulating water is filtered by the filter, so that more solid slag stays in the water cooling tower, the operation is stopped for a period of time, and after the solid slag is fully settled, the slag discharge port is opened for discharging. The cooling tower is connected with a circulating water replenishing pipeline 10.
And a second filter is connected to the circulating water replenishing pipeline. After the circulating water is filtered by the second filter, solid impurities in the circulating water can be reduced preliminarily, and the load of a subsequent filter is reduced.
The desalted water cooling system is connected with a desalted water replenishing pipeline 1 for replenishing the lost desalted water.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A formic acid internal circulation cooling system is characterized in that: comprises a desalted water cooling system and a circulating water cooling system, wherein,
the desalted water cooling system comprises a desalted water storage tank, a desalted water pump and a cold medium channel of a desalted water heat exchanger which are sequentially connected, wherein a heat medium channel of the desalted water heat exchanger is used for being connected with a gas-phase formic acid source, and an outlet of the cold medium channel of the desalted water heat exchanger is connected with the desalted water storage tank;
the circulating water cooling system comprises a water cooling tower, a circulating water pump and a cold medium channel of the heat exchanger which are connected in sequence, and the outlet of the cold medium channel of the heat exchanger is connected with the water cooling tower;
the heat medium channel of the heat exchanger is connected between the desalted water pump and the desalted water heat exchanger.
2. The internal formic acid circulation cooling system as defined in claim 1, wherein: the number of the desalted water heat exchangers is at least 2, and the desalted water heat exchangers are arranged in parallel.
3. The internal formic acid circulation cooling system as defined in claim 1, wherein: the heat exchanger is of a horizontal structure and comprises a shell and a plurality of heat exchange tubes, wherein the shell is internally provided with a plurality of baffle plates, the heat exchange tubes are arranged in the shell in a snake shape, the heat exchange tubes form a heat medium channel, and a cold medium channel is enclosed between the shell and the heat exchange tubes.
4. The internal formic acid circulation cooling system as defined in claim 3, wherein: the hot medium channel and the cold medium channel are opposite in flow direction as a whole.
5. The internal formic acid circulation cooling system as defined in claim 3, wherein: and circulating water and desalted water are introduced into the heat exchanger from the bottom of the heat exchanger.
6. The internal formic acid circulation cooling system as defined in claim 1, wherein: and a first filter is arranged at the outlet of the water cooling tower, and circulating water flows to the heat exchanger after being filtered.
7. The internal formic acid circulation cooling system as defined in claim 6, wherein: and a slag discharge port is arranged at the bottom of the water cooling tower.
8. The internal formic acid circulation cooling system as defined in claim 6, wherein: the water cooling tower is connected with a circulating water replenishing pipeline.
9. The internal formic acid circulation cooling system as defined in claim 8, wherein: and a second filter is connected to the circulating water replenishing pipeline.
10. The internal formic acid circulation cooling system as defined in claim 1, wherein: the desalted water cooling system is connected with a desalted water replenishing pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921802425.9U CN211178054U (en) | 2019-10-24 | 2019-10-24 | Formic acid internal circulation cooling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921802425.9U CN211178054U (en) | 2019-10-24 | 2019-10-24 | Formic acid internal circulation cooling system |
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| CN211178054U true CN211178054U (en) | 2020-08-04 |
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| CN201921802425.9U Active CN211178054U (en) | 2019-10-24 | 2019-10-24 | Formic acid internal circulation cooling system |
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