CN213160143U - Combined low dew point dryer - Google Patents
Combined low dew point dryer Download PDFInfo
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- CN213160143U CN213160143U CN202020912758.3U CN202020912758U CN213160143U CN 213160143 U CN213160143 U CN 213160143U CN 202020912758 U CN202020912758 U CN 202020912758U CN 213160143 U CN213160143 U CN 213160143U
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Abstract
The utility model discloses a combined low dew point dryer, which comprises a freezing drying system, an adsorption drying system, a connecting pipeline and a control valve, wherein the freezing drying system comprises a heat exchanger, a compressor, a condenser, a corresponding connecting pipeline and a corresponding control valve; the adsorption type drying system comprises an adsorption tower, a corresponding connecting pipeline and a control valve, a second-stage heat exchanger is arranged at the output end of a compressor, the refrigerant output end of the second-stage heat exchanger is communicated with a condenser, the second-stage heat exchanger is connected with the adsorption tower through a pipeline, the air inlet pipeline of the second-stage heat exchanger is communicated with the connecting pipeline of the adsorption tower, the air outlet of the heat exchanger is connected with the connecting pipeline of the adsorption tower in parallel through a pipeline bypass, and a regeneration air valve is arranged on the pipeline connected with the air outlet pipeline of the adsorption tower, the heat exchanger and the second-stage heat exchanger. The device has the characteristics of reasonable heat application of the whole device, energy consumption reduction and capability of improving the regeneration quality of the adsorbent.
Description
Technical Field
The utility model belongs to the technical field of the desiccator technique and specifically relates to a modular low dew point drying machine is related to.
Background
The freezing type dryer is based on the principle of freezing and dehumidification, high-temperature and high-humidity compressed gas is subjected to heat exchange with a refrigeration system consisting of an evaporator, a compressor, a condenser and the like to reduce the temperature to obtain ideal finished gas, in the refrigeration system, low-temperature and low-pressure refrigerant is subjected to heat exchange with compressed air in the evaporator to be evaporated, the refrigerant is compressed into high-temperature and high-pressure refrigerant gas through the compressor, and then the refrigerant gas is condensed through the condenser to take away heat to form low-temperature and high-pressure refrigerant liquid, so that the ideal refrigerant is provided for the next heat exchange in the evaporator, and the closed cycle of evaporation, compression, condensation and evaporation is realized.
When the adsorption dryer is used for adsorption at normal temperature, according to the pressure swing adsorption Principle (PSA), the surface of the adsorbent and the partial pressure of water vapor in the air are balanced to adsorb the moisture in the air, so that the purpose of removing the moisture in the compressed air is achieved. When air is dried by passing through one tower, the other tower is fed with a small amount of dry compressed air, and the method of depressurization and purging is adopted to desorb and regenerate the adsorbent which has adsorbed the moisture, i.e. the adsorbent is desorbed and the moisture is discharged out of the machine.
The freezing type dryer has the advantages of no air loss and low energy consumption, but the dew point temperature of the freezing type dryer is limited, while the adsorption type dryer has the advantage of low dew point of finished product gas, but the regenerated gas has high loss and high energy consumption; therefore, in order to achieve the best economic operation point and obtain high-quality low dew point product gas, people usually utilize the advantages of the low dew point product gas and the low dew point product gas to the maximum extent through reasonable pipeline connection and capacity matching to form a low dew point dryer.
At present, most low dew point dryers are simply combined by pipelines of a freezing dryer and an adsorption dryer, and the low dew point dryers can be unreasonably arranged in a simple combination mode, for example, due to the combination of the freezing dryer, the low dew point dryers have large amount of cold energy stored in the outlet temperature, the inlet temperature is high, so that a compression refrigeration system needs to consume more energy for refrigeration, and the cold energy at the outlet is wasted; for example, a heating device is arranged at an air outlet of an adsorption dryer, and hot regeneration air is generated to regenerate the dryer in the adsorption tower, but a compression refrigeration system of the low dew point dryer can generate a large amount of heat and directly emit the heat to the environment.
According to the temperature change principle, the part of the dry compressed air is heated to a certain temperature before the adsorbent is regenerated, so that the adsorption capacity of the adsorbent is greatly reduced, the regeneration efficiency of the adsorbent is greatly improved, and the consumption of regenerated gas is saved.
For example, chinese patent publication No. CN201596450U, granted announcement day 2010, 10 months 06 days, the patent name "low dew point dryer of combination formula" this utility model discloses a low dew point dryer of combination formula that compressed air dew point is low, the absorption regeneration gas consumption is few, and can the energy saving, improves finished gas dryness, it includes the refrigeration machine, adsorbs dryer, filter and control box and installs on the chassis, the air inlet and the gas supply line of refrigeration machine are connected, the gas outlet passes through connecting tube and is connected with the air inlet of filter, and the gas outlet of filter passes through connecting tube and is connected with the air inlet of absorption formula dryer. The utility model discloses a title has that the compressed air dew point is low, the absorption regeneration air consumption is few, and can the energy saving, improves the characteristics of finished product gas dryness, but from its structural view, it still has above-mentioned problem, and the holistic heat application of device is unreasonable, and the energy consumption is higher.
Disclosure of Invention
The utility model discloses an it is unreasonable to overcome the holistic heat application of device among the prior art, and the higher not enough of energy consumption provides a modular low dew point drying machine, and it is reasonable to have the holistic heat application of device, reduces the energy consumption, also can improve the characteristics of the regeneration quality of adsorbent.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a combined low dew point dryer comprises a freezing drying system, an adsorption drying system, a connecting pipeline and a control valve, wherein the freezing drying system comprises a heat exchanger, a compressor, a condenser and the corresponding connecting pipeline and the corresponding control valve; the adsorption drying system comprises an adsorption tower, a corresponding connecting pipeline and a control valve, a secondary heat exchanger is arranged at the output end of the compressor, the refrigerant output end of the secondary heat exchanger is communicated with the condenser, the secondary heat exchanger is connected with the adsorption tower through a pipeline, the air inlet pipeline of the secondary heat exchanger is communicated with the connecting pipeline of the adsorption tower, the air outlet of the heat exchanger is in bypass connection with the connecting pipeline of the adsorption tower and is connected with the air outlet pipeline of the secondary heat exchanger in parallel, a regeneration air valve is arranged on the pipeline, connected with the air outlet pipeline of the heat exchanger and the air outlet pipeline of the secondary heat exchanger, of the adsorption tower, and an automatic expansion valve is arranged between the heat exchanger and the.
Because the air of air outlet valve combustion gas from absorption formula drying system is the dry air of low temperature, is sent out the desiccator directly usually, and the cold volume that deposits in it has been fallen by direct waste, consequently, the utility model discloses an output at the compressor is equipped with the second grade heat exchanger and is provided with the second grade heat exchanger, the refrigerant output of second grade heat exchanger be linked together with the condenser, the second grade heat exchanger with the adsorption tower passes through the pipeline and links to each other, the inlet line of second grade heat exchanger and the connecting line intercommunication of adsorption tower, the gas outlet of heat exchanger is in through the pipeline bypass the connecting line of adsorption tower and with the gas outlet pipeline of second grade heat exchanger is parallelly connected, the adsorption tower with be equipped with regeneration air valve on the pipeline that the gas outlet pipeline of heat exchanger and second grade heat. So design makes from the air outlet valve exhaust gas of adsorption drying system for the air part entering secondary heat exchanger of low temperature drying, the rest gets into in the heat exchanger, outside air gets into the heat exchanger from the air inlet, carry out the heat exchange with adsorption drying system's low temperature drying gas, to giving vent to anger exhaust gas to adsorption drying system when cooling down admitting air and heat up, and the part that gets into secondary heat exchanger gets into and gets back to the adsorption tower as the regeneration gas after carrying out the heat exchange with the compressor output, regenerate the adsorbent in the adsorption tower, simultaneously, draw the regeneration gas at the same bypass pipeline in gas outlet so that the regeneration effect of desiccator is good.
Preferably, the output end of the compressor is connected with the heat exchanger through a pipeline, and a defrosting valve is arranged on the compressor. The phenomenon of frost in the heat exchanger due to the over-low temperature is prevented.
Preferably, the heat exchanger comprises a precooling heat regenerator, an evaporator and a steam-water separator, wherein the upstream of the condenser is communicated with the evaporator in the heat exchanger through a pipeline, and the defrosting valve is arranged between the upstream of the condenser and the evaporator in the heat exchanger. The high-temperature refrigerant at the upstream of the condenser is adopted to defrost the heat exchanger, so that the original heat in the system is fully utilized, and the energy is saved.
Preferably, the gas outlet pipeline of the adsorption drying system is communicated with the outside through a precooling heat regenerator. A precooling heat regenerator is arranged in the heat exchanger, so that the product gas prepared by the system is used as a refrigerant to exchange heat with the inlet gas in advance, and the inlet gas is precooled and the product gas is reheated.
Preferably, a pressure control valve is provided in the freeze drying system. The pressure control valve is arranged in the freeze drying system to control the pressure of the freeze drying system, and the freeze drying system is switched between high pressure and low pressure to prevent the system pressure from being too high.
Preferably, a heating valve is connected in series on the air inlet pipeline of the secondary heat exchanger, and a bypass valve communicated with the air outlet pipeline of the secondary heat exchanger is arranged on the upstream of the heating valve. According to the temperature change principle, the part of dry compressed air is heated to a certain temperature before the adsorbent is regenerated, so that the adsorption capacity of the adsorbent is greatly reduced, the regeneration efficiency of the adsorbent is greatly improved, the regeneration gas consumption is saved, and the adsorbent is required to be subjected to cold blowing after the adsorbent is regenerated to completely recover the water absorption capacity; therefore, the heating valve is connected in series on the air inlet pipeline of the secondary heat exchanger, under the normal condition, part of finished gas can be taken away from the air outlet end of the adsorption drying system to be regenerated gas by controlling the heating valve, the refrigerant in the high-temperature high-pressure end pipeline of the freezing drying system is cooled by the secondary heat exchanger to absorb heat and then enters the regeneration adsorption tower, after the adsorbent in the regeneration adsorption tower is regenerated, the bypass valve is opened, so that the finished gas extracted from the air outlet end of the adsorption drying system directly enters the regeneration adsorption tower, cold blowing is carried out on the adsorbent, the regeneration efficiency of the adsorbent is greatly improved, and the consumption of the regenerated gas is saved.
The utility model has the advantages that: the heat released by the condenser can be reduced, the energy consumption is reduced, the heat utilization of the whole device is reasonable, the energy consumption is reduced, and the regeneration quality of the adsorbent can be improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: the system comprises a heat exchanger 1, a compressor 2, a condenser 3, a secondary heat exchanger 4, a regeneration air valve 5, an automatic expansion valve 6, a defrosting valve 7, a pressure control valve 8, an adsorption tower 9, an air outlet valve 10, an exhaust valve 11, an air inlet valve 12 and a silencer 13.
Detailed Description
To make the objects, technical solutions and advantages of embodiments of the present invention clearer, the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present solution, and are not construed as limiting the present solution.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "a plurality" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as fixed or removable connections or integral parts, either mechanically or electrically, or in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art
The specific embodiment is as follows: a combined low dew point dryer comprises a freezing drying system, an adsorption drying system, a connecting pipeline and a control valve, wherein the freezing drying system comprises a heat exchanger 1, a compressor 2, a condenser 3, and the corresponding connecting pipeline and the corresponding control valve; the adsorption type drying system comprises an adsorption tower 9, a corresponding connecting pipeline and a control valve, the adsorption type drying system comprises an air outlet valve 10 located above the adsorption tower, an air inlet valve 12 and an air outlet valve 11 located below the adsorption tower, a silencer 13 is connected to the air outlet valve, a secondary heat exchanger 4 is arranged at the output end of a compressor, the refrigerant output end of the secondary heat exchanger is communicated with a condenser, the secondary heat exchanger is connected with the adsorption tower through a pipeline, the air inlet pipeline of the secondary heat exchanger is communicated with the connecting pipeline of the adsorption tower, the air outlet of the heat exchanger is connected with the air outlet pipeline of the secondary heat exchanger in parallel through a pipeline bypass, and a regeneration air valve 5 is arranged on the pipeline connecting the air outlet pipelines of the adsorption tower and.
Because the air of air outlet valve combustion gas from absorption formula drying system is the dry air of low temperature, is sent out the desiccator directly usually, and the cold volume that holds in it is directly wasted and has fallen, consequently, the utility model discloses an output at the compressor is equipped with the second grade heat exchanger and is provided with the second grade heat exchanger, the refrigerant output of second grade heat exchanger be linked together with the condenser, the second grade heat exchanger pass through the pipeline with the adsorption tower and link to each other, the inlet line of second grade heat exchanger and the connecting line intercommunication of adsorption tower, the gas outlet of heat exchanger passes through the pipeline bypass and connects in parallel on the connecting line of adsorption tower and with the air outlet pipeline of second grade heat exchanger, be equipped with regeneration air valve on the pipeline that adsorption tower and heat exchanger and. The design makes the gas discharged from the outlet of the adsorption drying system enter the secondary heat exchanger as a low-temperature dry air part, the rest part enters the heat exchanger, the outside air enters the heat exchanger from the air inlet, and exchanges heat with the low-temperature dry gas of the adsorption drying system, the temperature of the gas discharged from the outlet of the adsorption drying system is raised while the temperature of the inlet air is lowered, the part entering the secondary heat exchanger enters the compressor output end for heat exchange and then returns to the adsorption tower as regenerated gas, the adsorbent in the adsorption tower is regenerated, and meanwhile, the regenerated gas is extracted through the same bypass pipeline at the air outlet so that the regeneration effect of the dryer is good.
Further, an automatic expansion valve 6 is arranged between the heat exchanger and the condenser.
Furthermore, the output end of the compressor is connected with the heat exchanger through a pipeline, and a defrosting valve 7 is arranged on the compressor. A large amount of frost is generated due to the over-low temperature in the heat exchanger,
specifically, the heat exchanger comprises a precooling heat regenerator, an evaporator and a steam-water separator, wherein the upstream of the condenser is communicated with the evaporator in the heat exchanger through a pipeline, and a defrosting valve is arranged between the upstream of the condenser and the evaporator. The high-temperature refrigerant at the upstream of the condenser is adopted to defrost the heat exchanger, so that the original heat in the system is fully utilized, and the energy is saved.
Specifically, an air outlet pipeline of the adsorption drying system is communicated with the outside through a precooling heat regenerator. A precooling heat regenerator is arranged in the heat exchanger, so that the product gas prepared by the system is used as a refrigerant to exchange heat with the inlet gas in advance, and the inlet gas is precooled and the product gas is reheated.
Further, a pressure control valve 8 is provided in the freeze drying system. The pressure control valve is arranged in the freeze drying system to control the pressure of the freeze drying system, and the freeze drying system is switched between high pressure and low pressure to prevent the system pressure from being too high.
Furthermore, a heating valve is connected in series on the air inlet pipeline of the secondary heat exchanger, and a bypass valve communicated with the air outlet pipeline of the secondary heat exchanger is arranged on the upper stream of the heating valve. According to the temperature change principle, the part of dry compressed air is heated to a certain temperature before the adsorbent is regenerated, so that the adsorption capacity of the adsorbent is greatly reduced, the regeneration efficiency of the adsorbent is greatly improved, the regeneration gas consumption is saved, and the adsorbent is required to be subjected to cold blowing after the adsorbent is regenerated to completely recover the water absorption capacity; therefore, the heating valve is connected in series on the air inlet pipeline of the secondary heat exchanger, under the normal condition, part of finished gas can be taken away from the air outlet end of the adsorption drying system to be regenerated gas by controlling the heating valve, the refrigerant in the high-temperature high-pressure end pipeline of the freezing drying system is cooled by the secondary heat exchanger to absorb heat and then enters the regeneration adsorption tower, after the adsorbent in the regeneration adsorption tower is regenerated, the bypass valve is opened, so that the finished gas extracted from the air outlet end of the adsorption drying system directly enters the regeneration adsorption tower, cold blowing is carried out on the adsorbent, the regeneration efficiency of the adsorbent is greatly improved, and the consumption of the regenerated gas is saved.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.
Claims (6)
1. A combined low dew point dryer comprises a freezing drying system, an adsorption drying system, a connecting pipeline and a control valve, wherein the freezing drying system comprises a heat exchanger, a compressor, a condenser and the corresponding connecting pipeline and the corresponding control valve; the adsorption drying system comprises an adsorption tower, a corresponding connecting pipeline and a control valve, and is characterized in that a second-stage heat exchanger is arranged at the output end of the compressor, the refrigerant output end of the second-stage heat exchanger is communicated with a condenser, the second-stage heat exchanger is connected with the adsorption tower through a pipeline, the air inlet pipeline of the second-stage heat exchanger is communicated with the connecting pipeline of the adsorption tower, the air outlet of the heat exchanger is in bypass connection with the connecting pipeline of the adsorption tower and is connected with the air outlet pipeline of the second-stage heat exchanger in parallel, a regeneration air valve is arranged on the pipeline, connected with the air outlet pipeline of the heat exchanger and the air outlet pipeline of the second-stage heat exchanger, of the adsorption.
2. The combined low dew point dryer of claim 1, wherein the compressor output is connected to the heat exchanger by a pipe, and a defrost valve is provided thereon.
3. The combined low dew point dryer of claim 2, wherein the heat exchanger comprises a precooler, an evaporator and a moisture separator, the upstream of the condenser is communicated with the evaporator in the heat exchanger through a pipeline, and the defrosting valve is arranged between the upstream of the condenser and the evaporator.
4. The combined low dew point dryer of claim 1, wherein an outlet pipeline of the adsorption drying system is communicated with the outside through a precooling heat regenerator.
5. The combined low dew point dryer of any one of claims 1 to 4, wherein a pressure control valve is provided in the freeze drying system.
6. The combined low dew point dryer of claim 1, wherein a heating valve is connected in series to the inlet line of the secondary heat exchanger, and a bypass valve is provided upstream of the heating valve and communicates with the outlet line of the secondary heat exchanger.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779644A (en) * | 2023-02-03 | 2023-03-14 | 杭州嘉隆气体设备有限公司 | Blast regeneration dryer and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115779644A (en) * | 2023-02-03 | 2023-03-14 | 杭州嘉隆气体设备有限公司 | Blast regeneration dryer and control method thereof |
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