CN109289818B - Molecular sieve purifying device and method utilizing heat pipe dehumidification heat exchanger - Google Patents

Molecular sieve purifying device and method utilizing heat pipe dehumidification heat exchanger Download PDF

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CN109289818B
CN109289818B CN201811141439.0A CN201811141439A CN109289818B CN 109289818 B CN109289818 B CN 109289818B CN 201811141439 A CN201811141439 A CN 201811141439A CN 109289818 B CN109289818 B CN 109289818B
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molecular sieve
channel
air
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heat exchanger
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CN109289818A (en
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张春伟
张学军
邱利民
赵阳
林秀娜
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30Processes for preparing, regenerating, or reactivating
    • B01J20/34Regenerating or reactivating
    • B01J20/3408Regenerating or reactivating of aluminosilicate molecular sieves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30Processes for preparing, regenerating, or reactivating
    • B01J20/34Regenerating or reactivating
    • B01J20/3483Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling

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Abstract

The invention discloses a molecular sieve purifying device and a method thereof by utilizing a heat pipe dehumidification heat exchanger. The device comprises a molecular sieve adsorber, a heater, a heat pipe dehumidification heat exchanger, a fan, a valve and the like. The dirty nitrogen gas cold blowing control valve is arranged on the dirty nitrogen gas cold blowing channel, and the dirty nitrogen gas heating control valve is arranged on the dirty nitrogen gas heating channel. The heat pipe dehumidifying heat exchanger can be divided into a pretreatment air channel and a regeneration air channel which are separated by a partition plate. The heat pipe dehumidification heat exchanger is arranged between the air inlet channel and the molecular sieve adsorber. The air inlet channel is connected with the pretreatment air channel, and the waste nitrogen gas emptying channel is connected with the regeneration air channel of the heat pipe dehumidification heat exchanger. The solid adsorbent material is coated on the fins in the preconditioned air path. The invention adopts the heat pipe dehumidification heat exchanger to pretreat the air to be purified entering the molecular sieve adsorber, and simultaneously utilizes the waste heat of the waste nitrogen discharged by cold blowing to regenerate, thereby prolonging the operation period of the molecular sieve purification system and effectively realizing the energy conservation and consumption reduction of the molecular sieve purification device.

Description

Molecular sieve purifying device and method utilizing heat pipe dehumidification heat exchanger
Technical Field
The invention relates to the field of molecular sieve design, in particular to a molecular sieve purifying device utilizing a heat pipe dehumidification heat exchanger.
Background
With the rapid development of the industries such as the metallurgical industry, the petrochemical industry, the coal chemical industry and the like, the air separation equipment technology is also rapidly developed, and the development direction is large-scale, low operation cost, stable and reliable equipment operation and the like. Market competition of air separation equipment users is increasingly intense, and how to reduce operation cost is very important, and a molecular sieve purification system is one of key equipment for realizing energy conservation and consumption reduction of an air separation device. The operation energy consumption of the sub-sieve purification system mainly comprises two parts: one part is the resistance of the pipeline and the valve when the gas flows; another part is the energy consumption required for molecular sieve regeneration. Desorption regeneration of a molecular sieve adsorber is a heat absorption process, and generally, waste nitrogen gas of an air separation device is heated by a heater and then enters the molecular sieve adsorber to be desorbed and regenerated. In order to reach the temperature of molecular sieve adsorption work, cold dirty nitrogen is used for cold blowing after desorption, and the temperature of the adsorber is reduced. The temperature of the waste nitrogen discharged in the cold blowing process is far higher than that of unheated waste nitrogen, and the quantity of the waste nitrogen is huge. In the conventional air purification system comprising two molecular sieve adsorbers working in parallel, the heat contained in the cold blowing nitrogen is difficult to utilize due to time difference, and the cold blowing nitrogen is usually directly discharged, so that a great deal of energy is wasted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a molecular sieve purifying device utilizing a heat pipe dehumidifying heat exchanger, namely, the heat pipe dehumidifying heat exchanger capable of utilizing the waste heat of cold blowing nitrogen is added in the prior molecular sieve purifying device. The specific form is that solid adsorbent with regeneration temperature lower than molecular sieve, such as silica gel, active carbon, etc. is coated on the condensing end fin of the heat pipe heat exchanger. Before entering the molecular sieve adsorber, air firstly enters the heat pipe dehumidification heat exchanger for pre-adsorption, and in the regeneration stage of the molecular sieve adsorber, discharged cold blow-off nitrogen flows through the evaporation end of the heat pipe dehumidification heat exchanger, and the solid adsorbent with saturated adsorption absorbs the waste heat of the solid adsorbent through the heat pipe to complete regeneration, so that the operation period of a molecular sieve purification system is finally prolonged, and the energy conservation and consumption reduction of the system are realized.
The invention aims to realize the purpose of the invention by the following technical scheme:
utilize molecular sieve purifier of heat pipe dehumidification heat exchanger, it includes: the device comprises a first molecular sieve adsorber, a second molecular sieve adsorber, a first heater, a second heater, a first heat pipe dehumidification heat exchanger, a second heat pipe dehumidification heat exchanger, a first fan, a second fan, a first dehumidifier regeneration channel, a second dehumidifier regeneration channel, a waste nitrogen heating channel, a waste nitrogen cold blowing channel, an air outlet channel, a first air inlet channel, a second air inlet channel, a first air pretreatment branch, a second air pretreatment branch, a waste nitrogen emptying channel and a waste nitrogen inlet channel;
the first heat pipe dehumidification heat exchanger and the second heat pipe dehumidification heat exchanger are externally provided with a shell, the interior of the shell is divided into a pretreatment air channel and a regeneration air channel through a partition plate, and a solid adsorbent is coated on fins in the pretreatment air channel;
a pipeline at one end of the first molecular sieve adsorber is divided into two branches, the first branch is connected with a sewage nitrogen gas inlet channel, the second branch is connected with an air outlet channel, a first automatic control valve is arranged on the first branch, and a second automatic control valve is arranged on the second branch; the other end of the first molecular sieve adsorber is connected with a first air inlet channel through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for introducing air to be purified into the first air inlet channel, the third branch and the fourth branch are both connected with a waste nitrogen gas emptying channel after passing through a regeneration air channel of the first heat pipe dehumidification heat exchanger, and a sixth automatic control valve, a first pressure increasing valve, a first pressure reducing valve and a fifth automatic control valve are respectively arranged on the first branch, the second branch, the third branch and the fourth branch; a first three-way valve and a second three-way valve are sequentially connected to a first air inlet channel between the second branch and the third branch, one end of a first air pretreatment branch in the fifth branch is connected to a valve port of the second three-way valve, then the third three-way valve, a pretreatment air channel of the first heat pipe dehumidification heat exchanger and the fourth three-way valve are sequentially connected, the other end of the first air pretreatment branch is connected to a valve port of the first three-way valve, and the first air pretreatment branch is controlled to be opened and closed through the first three-way valve and the second three-way valve; the valve ports of the third three-way valve and the fourth three-way valve, which are not connected with the first air pretreatment branch, are connected with a first dehumidifier regeneration channel, a first fan is arranged on the first dehumidifier regeneration channel, and the third three-way valve and the fourth three-way valve are used for controlling the opening and closing of the first dehumidifier regeneration channel;
a pipeline at one end of the second molecular sieve adsorber is divided into two branches, the first branch is connected with a sewage nitrogen gas inlet channel, the second branch is connected with an air outlet channel, a third automatic control valve is arranged on the first branch, and a fourth automatic control valve is arranged on the second branch; the other end of the second molecular sieve adsorber is connected with a second air inlet channel through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for introducing air to be purified into the second air inlet channel, the third branch and the fourth branch are both connected with a waste nitrogen gas emptying channel after passing through a regeneration air channel of the second heat pipe dehumidification heat exchanger, and an eighth automatic control valve, a second pressure increasing valve, a second pressure relief valve and a seventh automatic control valve are respectively arranged on the first branch, the second branch, the third branch and the fourth branch; a fifth three-way valve and a sixth three-way valve are sequentially connected to a second air inlet channel between the second branch and the third branch, one end of a second air pretreatment branch in the fifth branch is connected to a valve port of the sixth three-way valve, and then a seventh three-way valve, a pretreatment air channel of the second heat pipe dehumidification heat exchanger and an eighth three-way valve are sequentially connected, the other end of the second air pretreatment branch is connected to a valve port of the fifth three-way valve, and the opening and closing of the second air pretreatment branch are controlled through the fifth three-way valve and the sixth three-way valve; the valve ports of the seventh three-way valve and the eighth three-way valve, which are not connected with the second air pretreatment branch, are connected with a second dehumidifier regeneration channel, a second fan is arranged on the second dehumidifier regeneration channel, and the seventh three-way valve and the eighth three-way valve are used for controlling the opening and closing of the second dehumidifier regeneration channel;
dividing the waste nitrogen entering the molecular sieve purification device into two paths; one path is introduced into a waste nitrogen cold blowing channel, a waste nitrogen cold blowing control valve is arranged on the waste nitrogen cold blowing channel, and the waste nitrogen cold blowing channel is connected into a waste nitrogen inlet channel; the other path is introduced into a dirty nitrogen heating channel, a dirty nitrogen heating control valve is arranged on the dirty nitrogen heating channel, the channel behind the dirty nitrogen heating control valve is divided into two branches, the first branch is sequentially connected with an eleventh automatic control valve, a first heater and a ninth automatic control valve, the second branch is sequentially connected with a twelfth automatic control valve, a second heater and a tenth automatic control valve, and the two branches are connected into a dirty nitrogen inlet channel after being converged; switching the flow direction of the waste nitrogen gas through the opening and closing of a waste nitrogen gas heating control valve and a waste nitrogen gas cold blowing control valve;
introducing air to be purified into the first molecular sieve adsorber or the second molecular sieve adsorber from the first air inlet channel or the second air inlet channel for purification; the purified air is discharged from the air outlet passage.
Compared with the conventional molecular sieve purification system, the invention is characterized in that two heat pipe dehumidification heat exchangers are added, and the dehumidifier directly utilizes the waste heat of the cold blowing nitrogen for regeneration, thereby realizing the effective recovery of the waste heat of the cold blowing nitrogen, prolonging the operation period of the molecular sieve purification system and greatly reducing the energy consumption of the molecular sieve purification device.
Preferably, the first heat pipe dehumidification heat exchanger is arranged in front of the first molecular sieve adsorber; the second heat pipe dehumidification heat exchanger is arranged in front of the second molecular sieve adsorber and is used for pretreating air entering the molecular sieve.
Preferably, in the first heat pipe dehumidification heat exchanger and the second heat pipe dehumidification heat exchanger, fins inside the pretreatment air channel are coated with a solid adsorption material with the regeneration temperature lower than that of molecular sieve particles, and the solid adsorption material comprises silica gel, activated carbon and the like.
Preferably, in the first heat pipe dehumidification heat exchanger and the second heat pipe dehumidification heat exchanger, the heat pipes in the pretreatment air channel and the regeneration air channel are respectively provided with a plurality of fins.
Preferably, when the first heat pipe dehumidification heat exchanger is regenerated, a first fan on a regeneration channel of the first dehumidifier is started; when the second heat pipe dehumidification heat exchanger regenerates, a second fan on the regeneration channel of the second dehumidifier is started.
Preferably, the first air pretreatment branch is provided with a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve; and a fifth three-way valve, a sixth three-way valve, a seventh three-way valve and an eighth three-way valve which are arranged on the second air pretreatment branch are used for controlling the opening states of different pipelines through valve switching.
Preferably, a silencer is arranged at the vent at the tail end of the waste nitrogen gas venting channel.
Preferably, one of the first heater and the second heater is operated, and the other heater is standby.
Another object of the present invention is to provide an air purification method using the molecular sieve purification apparatus according to any of the above embodiments, comprising the following steps:
1) firstly, air to be purified enters a first heat pipe dehumidification heat exchanger for pretreatment through a first air pretreatment branch by valve switching, the content of water and carbon dioxide in the air is reduced preliminarily, and then the air enters a first molecular sieve adsorber which is in an adsorption state; the second molecular sieve adsorber is saturated in adsorption, the pressure is relieved by switching a second pressure relief valve, heating regeneration is started, waste nitrogen for heating regeneration enters a first heater or a second heater for heating, the temperature is raised, and the waste nitrogen enters the second molecular sieve adsorber for heating regeneration of the molecular sieve after reaching the set temperature; after the second molecular sieve adsorber is heated, dirty nitrogen directly enters the second molecular sieve adsorber through a dirty nitrogen cold blowing channel and a dirty nitrogen air inlet channel through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters a second heat pipe dehumidification heat exchanger through a dirty nitrogen air discharge channel and then is discharged, solid adsorption materials in the second heat pipe dehumidification heat exchanger absorb waste heat in the cold blowing dirty nitrogen through heat pipes to complete regeneration, a second dehumidifier regeneration channel is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a second fan; after the cold blowing is finished, the second heat pipe dehumidification heat exchanger and the second molecular sieve adsorber finish regeneration, and the second molecular sieve adsorber starts to be boosted through valve switching;
2) then, the air to be purified enters a second heat pipe dehumidification heat exchanger for pretreatment through valve switching, the water and carbon dioxide content in the air is preliminarily reduced, and then the air enters a second molecular sieve adsorber which is in an adsorption state; the first molecular sieve adsorber is saturated in adsorption, the first pressure relief valve is switched to relieve pressure, then heating regeneration is started, waste nitrogen for heating regeneration enters the first heater or the second heater to be heated, and enters the first molecular sieve adsorber to heat and regenerate the molecular sieve after reaching the set temperature; after the first molecular sieve adsorber is heated, dirty nitrogen directly enters the first molecular sieve adsorber through a dirty nitrogen cold blowing channel and a dirty nitrogen air inlet channel through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters a first heat pipe dehumidification heat exchanger through a dirty nitrogen air discharge channel and then is discharged, solid adsorption materials in the first heat pipe dehumidification heat exchanger absorb waste heat in the cold blowing dirty nitrogen through heat pipes to complete regeneration, a first dehumidifier regeneration channel is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a first fan; after the cold blowing is finished, the first heat pipe dehumidification heat exchanger and the first molecular sieve adsorber finish regeneration, and the first molecular sieve adsorber starts to be boosted through valve switching;
3) and (5) continuously circulating the steps 1) to 2) to finish the air separation purification.
Preferably, the first heater and the second heater are switched to alternatively operate; and after the heating regeneration process is finished, the first heater or the second heater stops heating.
Compared with the conventional air purification system, the invention has the outstanding and beneficial technical effects that: the heat pipe has strong heat conduction capability, no extra power consumption and moving parts, simple structure and reliable performance, and has outstanding advantages in the aspect of industrial waste heat recovery; the heat pipe dehumidifier reduces the work load of the molecular sieve adsorber and prolongs the work period of the molecular sieve adsorber by effectively pretreating the air entering the molecular sieve; the heat pipe dehumidification heat exchanger can regenerate through the waste heat of cold blowing nitrogen, and the waste heat of cold blowing nitrogen of the molecular sieve purification device is efficiently utilized.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings so as to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a molecular sieve purification apparatus using a heat pipe dehumidification heat exchanger according to the present invention.
Fig. 2 is a schematic structural diagram of a heat pipe dehumidifying heat exchanger.
Reference numbers in the figures: a first molecular sieve adsorber 1, a second molecular sieve adsorber 2, a first heater 3, a second heater 4, a first heat pipe dehumidification heat exchanger 5, a second heat pipe dehumidification heat exchanger 6, a first automatic control valve 7, a second automatic control valve 8, a third automatic control valve 9, a fourth automatic control valve 10, a fifth automatic control valve 11, a first pressure relief valve 12, a sixth automatic control valve 13, a first pressure increasing valve 14, a seventh automatic control valve 15, a second pressure relief valve 16, an eighth automatic control valve 17, a second pressure increasing valve 18, a ninth automatic control valve 19, a tenth automatic control valve 20, an eleventh automatic control valve 21, a twelfth automatic control valve 22, a waste nitrogen gas heating control valve 23, a waste nitrogen gas blowing control valve 24, a first three-way valve 25, a second three-way valve 26, a third three-way valve 27, a fourth three-way valve 28, a fifth three-way valve 29, a sixth three-way valve 30, a seventh three-way valve 31, a fifth three-way valve 28, a, The system comprises an eighth three-way valve 32, a first fan 33, a second fan 34, a first dehumidifier regeneration channel 35, a second dehumidifier regeneration channel 36, a waste nitrogen heating channel 37, a waste nitrogen blowing channel 38, an air outlet channel 39, a first air inlet channel 40, a second air inlet channel 41, a first air pretreatment branch 42, a second air pretreatment branch 43, a waste nitrogen discharging channel 44, a waste nitrogen inlet channel 45, a silencer 46, a heat pipe dehumidifier pretreatment air channel 47, a partition plate 48, a heat pipe dehumidifier regeneration air channel 49, fins 50, heat pipes 51 and a shell 52.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a molecular sieve purifying apparatus using a heat pipe dehumidification heat exchanger includes: the device comprises a first molecular sieve adsorber 1, a second molecular sieve adsorber 2, a first heater 3, a second heater 4, a first heat pipe dehumidification heat exchanger 5, a second heat pipe dehumidification heat exchanger 6, a first fan 33, a second fan 34, a first dehumidifier regeneration channel 35, a second dehumidifier regeneration channel 36, a waste nitrogen heating channel 37, a waste nitrogen air blowing channel 38, an air outlet channel 39, a first air inlet channel 40, a second air inlet channel 41, a first air pretreatment branch 42, a second air pretreatment branch 43, a waste nitrogen air discharge channel 44, a waste nitrogen air inlet channel 45 and a silencer 46.
The first heat pipe dehumidifying heat exchanger 5 and the second heat pipe dehumidifying heat exchanger 6 have the same structure, and as shown in fig. 2, both the outer parts thereof are provided with a casing 52, and the inside of the casing 52 is divided into a pre-processing air passage 47 and a regeneration air passage 49 by a partition plate 48. A plurality of heat pipes 51 penetrating through the two channels are arranged in the pretreatment air channel 47 and the regeneration air channel 49, and a plurality of fins 50 are arranged on the heat pipes 51 in the pretreatment air channel 47 and the regeneration air channel 49 respectively to strengthen heat exchange as much as possible and realize utilization of waste heat. In the first heat pipe dehumidification heat exchanger 5 and the second heat pipe dehumidification heat exchanger 6, the fins 50 inside the pre-treatment air channel 47 are coated with a solid adsorption material having a regeneration temperature lower than that of the molecular sieve particles, and the solid adsorption material is used for adsorbing water, carbon dioxide and the like in the air. Such solid adsorptive dehumidifying material may be silica gel, activated carbon, etc. The pretreatment air channel 47 is used for pretreating air to be purified, the regeneration air channel 49 is used for introducing cold blowing regeneration waste nitrogen, and waste heat in the waste nitrogen is recycled through the heat exchange effect of the heat pipe 51, so that the heating regeneration of the solid adsorption material is realized.
The molecular sieve purification device is provided with two sets of molecular sieve adsorbers 1 with the same form, namely a first molecular sieve adsorber 1 and a second molecular sieve adsorber 2.
A pipeline at one end of the first molecular sieve adsorber 1 is divided into two branches, the first branch is connected with a dirty nitrogen gas inlet channel 45, the second branch is connected with an air outlet channel 39, a first automatic control valve 7 is arranged on the first branch, and a second automatic control valve 8 is arranged on the second branch; the other end of the first molecular sieve adsorber 1 is connected with a first air inlet channel 40 through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for leading air to be purified into the first air inlet channel 40, the third branch and the fourth branch are both connected with a waste nitrogen air release channel 44 through a regeneration air channel 49 of the first heat pipe dehumidification heat exchanger 5, and a sixth automatic control valve 13, a first pressure increasing valve 14, a first pressure relief valve 12 and a fifth automatic control valve 11 are respectively arranged on the first branch, the second branch, the third branch and the fourth branch. A first three-way valve 25 and a second three-way valve 26 are sequentially connected to the first air inlet channel 40 between the second branch and the third branch, two valve ports of the first three-way valve 25 are connected to the first air inlet channel 40, the second three-way valve 26 is also the same, and two ends of a fifth branch at the other end of the first molecular sieve adsorber 1 are connected to the first three-way valve 25 and the second three-way valve 26. The main pipe in the fifth branch is a first air pretreatment branch 42, one end of which is connected to the third valve port of the second three-way valve 26, and then the third three-way valve 27, the pretreatment air channel 47 of the first heat pipe dehumidification heat exchanger 5, and the fourth three-way valve 28 are connected in sequence, and the other end of the first air pretreatment branch 42 is connected to the third valve port of the first three-way valve 25, so that the opening and closing of the first air pretreatment branch 42 can be controlled by switching the valves of the first three-way valve 25 and the second three-way valve 26. The third three-way valve 27 and the fourth three-way valve 28 also have two valve ports connected to the first air pretreatment branch 42, and the valve ports of the third three-way valve 27 and the fourth three-way valve 28, which are not connected to the first air pretreatment branch 42, are both connected to the first dehumidifier regeneration channel 35, the first dehumidifier regeneration channel 35 is provided with the first fan 33, the opening and closing of the first dehumidifier regeneration channel 35 can be controlled by the third three-way valve 27 and the fourth three-way valve 28, and air is introduced into the pretreatment air channel 47 of the first heat pipe dehumidification heat exchanger 5 for cold blowing.
A pipeline at one end of the second molecular sieve adsorber 2 is divided into two branches, the first branch is connected with a dirty nitrogen gas inlet channel 45, the second branch is connected with an air outlet channel 39, a third automatic control valve 9 is arranged on the first branch, and a fourth automatic control valve 10 is arranged on the second branch; the other end of the second molecular sieve adsorber 2 is connected with a second air inlet channel 41 through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for leading air to be purified into the second air inlet channel 41, the third branch and the fourth branch are both connected with a dirty nitrogen air release channel 44 through a regeneration air channel 49 of the second heat pipe dehumidification heat exchanger 6, and the first branch, the second branch, the third branch and the fourth branch are respectively provided with an eighth automatic control valve 17, a second pressure increasing valve 18, a second pressure relief valve 16 and a seventh automatic control valve 15. A fifth three-way valve 29 and a sixth three-way valve 30 are sequentially connected to the second air inlet channel 41 between the second branch and the third branch, two valve ports of the fifth three-way valve 29 are connected to the second air inlet channel 41, the sixth three-way valve 30 is also connected to the fifth three-way valve 29, and two ends of the fifth branch at the other end of the second molecular sieve adsorber 2 are connected to the fifth three-way valve 29 and the sixth three-way valve 30. The main pipe in the fifth branch is a second air pretreatment branch 43, one end of the second air pretreatment branch 43 is connected to the third valve port of the sixth three-way valve 30, and then the seventh three-way valve 31, the pretreated air passage 47 of the second heat pipe dehumidification heat exchanger 6, and the eighth three-way valve 32 are connected in sequence, and the other end of the second air pretreatment branch 43 is connected to the third valve port of the fifth three-way valve 29, so that the second air pretreatment branch 43 can be switched and controlled by the fifth three-way valve 29 and the sixth three-way valve 30. The seventh three-way valve 31 and the eighth three-way valve 32 also have two valve ports respectively connected to the second air pretreatment branch 43, and the valve ports of the seventh three-way valve 31 and the eighth three-way valve 32, which are not connected to the second air pretreatment branch 43, are both connected to the second dehumidifier regeneration channel 36, the second dehumidifier regeneration channel 36 is provided with the second fan 34, the opening and closing of the second dehumidifier regeneration channel 36 can be controlled through the seventh three-way valve 31 and the eighth three-way valve 32, and air is introduced into the pretreatment air channel 47 of the second heat pipe dehumidification heat exchanger 6 for cold blowing.
The two molecular sieve adsorbers are connected with each channel in the same way, and the two molecular sieve adsorbers are operated in parallel. When one molecular sieve adsorber adsorbs, the other molecular sieve adsorber can be heated and regenerated, and the waste heat in the cold blowing sewage nitrogen can be recovered through the heat pipe dehumidification heat exchanger and is used for the regeneration of the solid adsorption material.
In the molecular sieve purification device, the regeneration process is realized by introducing polluted nitrogen. The waste nitrogen entering the molecular sieve purification device is divided into two paths: one path is introduced into a waste nitrogen air cooling and blowing channel 38, a waste nitrogen air cooling and blowing control valve 24 is arranged on the waste nitrogen air cooling and blowing channel 38, and the waste nitrogen air cooling and blowing channel 38 is connected into a waste nitrogen air inlet channel 45; and the other path is introduced into a dirty nitrogen heating channel 37, a dirty nitrogen heating control valve 23 is arranged on the dirty nitrogen heating channel, a channel behind the dirty nitrogen heating control valve 23 is divided into two branches, the first branch is sequentially connected with an eleventh automatic control valve 21, a first heater 3 and a ninth automatic control valve 19, the second branch is sequentially connected with a twelfth automatic control valve 22, a second heater 4 and a tenth automatic control valve 20, and the two branches are connected into a dirty nitrogen inlet channel 45 after being converged. The waste nitrogen entering the molecular sieve purification device passes through different channels at different times, and enters the waste nitrogen heating channel 37 when the adsorber is heated and regenerated; when the adsorber is cooled by cold blowing, the nitrogen purge gas enters the nitrogen purge gas cooling passage 38, and the flow direction thereof can be switched by opening and closing the nitrogen purge gas heating control valve 23 and the nitrogen purge gas cooling control valve 24.
In the whole molecular sieve purification device, air to be purified is introduced into the first molecular sieve adsorber 1 or the second molecular sieve adsorber 2 from the first air inlet channel 40 or the second air inlet channel 41 for purification; the purified air is discharged from the air outlet passage 39.
In the molecular sieve purification device, a first heat pipe dehumidification heat exchanger 5 is arranged in front of a first molecular sieve adsorber 1; the second heat pipe dehumidification heat exchanger 6 is arranged in front of the second molecular sieve adsorber 2 and is used for pretreating air entering the molecular sieve. The two molecular sieve adsorbers and the heat pipe dehumidification heat exchanger are switched for use, and when the first heat pipe dehumidification heat exchanger 5 is regenerated, the first fan 33 on the regeneration channel 35 of the first dehumidifier is started; when the second heat pipe dehumidification heat exchanger 6 is regenerated, the second fan 34 on the second dehumidifier regeneration channel 36 is turned on. The switching is realized by various valves, namely a first three-way valve 25, a second three-way valve 26, a third three-way valve 27 and a fourth three-way valve 28 which are arranged on the first air pretreatment branch 42; the fifth three-way valve 29, the sixth three-way valve 30, the seventh three-way valve 31 and the eighth three-way valve 32 which are arranged on the second air pretreatment branch 43 can control the opening states of different pipelines through valve switching. One of the first heater 3 and the second heater 4 is operated, and the other is on standby. In addition, in order to minimize noise, a silencer 46 is required at the vent location at the end of the dirty nitrogen vent channel 44.
Based on the device, the air purification method using the molecular sieve purification device can also be provided, and the steps are as follows:
1) firstly, the air to be purified enters a first heat pipe dehumidification heat exchanger 5 for pretreatment through a first air pretreatment branch 42 through valve switching, the water and carbon dioxide content in the air is preliminarily reduced, then the air enters a first molecular sieve adsorber 1, and the first molecular sieve adsorber 1 starts to be in an adsorption state; the second molecular sieve adsorber 2 is saturated in adsorption, pressure is relieved by switching a second pressure relief valve 16, heating regeneration is started, waste nitrogen for heating regeneration enters a first heater 3 or a second heater 4 for heating, the temperature is raised, and the waste nitrogen enters the second molecular sieve adsorber 2 for heating regeneration of the molecular sieve after reaching the set temperature; after the second molecular sieve adsorber 2 is heated, dirty nitrogen directly enters the second molecular sieve adsorber 2 through a dirty nitrogen cold blowing channel 38 and a dirty nitrogen air inlet channel 45 through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters the second heat pipe dehumidification heat exchanger 6 through a dirty nitrogen emptying channel 44 and is emptied, a solid adsorption material in the second heat pipe dehumidification heat exchanger 6 absorbs waste heat in cold blowing nitrogen through heat pipes to complete regeneration, a second dehumidifier regeneration channel 36 is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a second fan 34; after the cold blowing is finished, the second heat pipe dehumidification heat exchanger and the second molecular sieve adsorber finish regeneration, and the second molecular sieve adsorber 2 starts to be pressurized through valve switching;
2) then, the air to be purified enters the second heat pipe dehumidification heat exchanger 6 for pretreatment through the second air pretreatment branch 43 by valve switching, the water and carbon dioxide content in the air is preliminarily reduced, and then the air enters the second molecular sieve adsorber 2, and the second molecular sieve adsorber 2 starts to be in an adsorption state; the first molecular sieve adsorber 1 is saturated in adsorption, the pressure is relieved by switching a first pressure relief valve 12, heating regeneration is started, waste nitrogen for heating regeneration enters a first heater 3 or a second heater 4 for heating, the temperature is raised, and the waste nitrogen enters the first molecular sieve adsorber 1 for heating regeneration of the molecular sieve after reaching the set temperature; after the first molecular sieve adsorber 1 is heated, dirty nitrogen directly enters the first molecular sieve adsorber 1 through a dirty nitrogen cold blowing channel 38 and a dirty nitrogen air inlet channel 45 through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters the first heat pipe dehumidification heat exchanger 5 through a dirty nitrogen emptying channel 44 and is emptied, a solid adsorption material in the first heat pipe dehumidification heat exchanger 5 absorbs waste heat in cold blowing nitrogen through heat pipes to complete regeneration, a first dehumidifier regeneration channel 35 is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a first fan 33; after the cold blowing is finished, the first heat pipe dehumidification heat exchanger and the first molecular sieve adsorber finish regeneration, and the first molecular sieve adsorber 1 starts to be pressurized through valve switching;
3) and (5) continuously circulating the steps 1) to 2) to finish the air separation purification.
The first heater 3 and the second heater 4 are switched to operate alternatively; after the heating regeneration process is completed, the first heater 3 or the second heater 4 stops heating.
In the above steps, the operating states of different molecular sieve adsorbers can be changed by different valve switching operations, and the flow of the valve switching operations in different stages is described in detail as follows: assuming that the first heater 3 is operated and the second heater 4 is in standby for the current period; the first molecular sieve adsorber 1 is in a working state, the second molecular sieve adsorber 2 finishes adsorption, and pressure is not released. Current state of the valve: the second automatic control valve 8, the sixth automatic control valve 13, the ninth automatic control valve 19, the tenth automatic control valve 21 and the waste nitrogen cold blowing control valve 24 are opened; the first automatic control valve 7, the first pressure increasing valve 14, the first pressure reducing valve 12, the fifth automatic control valve 11, the third automatic control valve 9, the fourth automatic control valve 10, the eighth automatic control valve 17, the second pressure increasing valve 18, the second pressure reducing valve 16, the seventh automatic control valve 15, the tenth automatic control valve 20, the twelfth automatic control valve 22 and the dirty nitrogen gas heating control valve 23 are closed. The first three-way valve 25, the second three-way valve 26, the third three-way valve 27, and the fourth three-way valve 28 are in the state where the first air-pretreatment bypass 42 is opened, and the fifth three-way valve 29, the sixth three-way valve 30, the seventh three-way valve 31, and the eighth three-way valve 32 are in the state where the second air-pretreatment bypass 43 is opened. The first fan and the second fan are both in a closed state.
Stage I: the first molecular sieve adsorber is in an adsorption state.
And (3) the second molecular sieve adsorber 2 starts to release pressure, the second pressure relief valve 16 is opened, and the second pressure relief valve 16 is closed after the pressure release process is finished. And (3) starting the heating regeneration process of the second molecular sieve adsorber 2, opening the third automatic control valve 9, the eighth automatic control valve 15 and the waste nitrogen heating control valve 23, and closing the waste nitrogen cold blowing control valve 24. The waste nitrogen for regeneration enters a first heater 3 to be heated and heated, and enters a second molecular sieve adsorber 2 to be desorbed and regenerated after reaching the set temperature. Meanwhile, the seventh three-way valve 31 and the eighth three-way valve 32 are switched to open the second dehumidifier regeneration passage 36, and the second fan 34 is started. And when the heating process is finished, opening the waste nitrogen cold blowing control valve 24, closing the waste nitrogen heating control valve 23, and starting the cold blowing process of the second molecular sieve adsorber 2. The inlet waste nitrogen enters the second molecular sieve adsorber 2 through the waste nitrogen cold blowing channel 38, the waste nitrogen discharged by cold blowing is discharged through the waste nitrogen discharging channel 44, and the cold blowing waste nitrogen discharges waste heat when passing through the second heat pipe dehumidification heat exchanger, so that the solid adsorption material in the dehumidifier is regenerated. After the cold blowing of the second molecular sieve adsorber 2 is finished, the third automatic control valve 9 and the seventh automatic control valve 15 are closed, the seventh three-way valve 31 and the eighth three-way valve 32 are switched simultaneously, the second air pretreatment branch 43 is in a turn-on state, the second fan 34 is turned off, the second booster valve 18 is opened, the pressure rise is started, after the pressure rise is finished, the second booster valve 18 is closed, the eighth automatic control valve 17 and the fourth automatic control valve 10 are opened, and the second molecular sieve adsorber 2 starts adsorbing. And closing the second automatic control valve 8 and the sixth automatic control valve 13, and finishing the adsorption state of the first molecular sieve adsorber 1.
And stage II: the second molecular sieve adsorber is in an adsorption state.
The first molecular sieve adsorber 1 starts to release pressure, the first pressure relief valve 12 is opened, and after the pressure release process is finished, the first pressure relief valve 12 is closed. And (3) starting the heating regeneration process of the first molecular sieve adsorber 1, opening the first automatic control valve 7, the fifth automatic control valve 11 and the waste nitrogen heating control valve 23, and closing the waste nitrogen cold blowing control valve 24. The waste nitrogen for regeneration enters a first heater 3 to be heated and heated, and enters a first molecular sieve adsorber 1 to be desorbed and regenerated after reaching the set temperature. At the same time, the third three-way valve 27 and the fourth three-way valve 28 are switched to open the first dehumidifier regeneration passage 35, and the second fan 33 is turned on. After the heating process is finished, the dirty nitrogen cold blowing control valve 24 is opened, the dirty nitrogen heating control valve 23 is closed, and the cold blowing process of the first molecular sieve adsorber 1 is started. The inlet waste nitrogen enters the first molecular sieve adsorber 1 through the waste nitrogen air cooling and blowing channel 38, the waste nitrogen discharged by cold blowing is discharged through the waste nitrogen air discharging channel 44, and the cold blowing waste nitrogen discharges waste heat when passing through the first heat pipe dehumidification heat exchanger, so that the solid adsorption material in the dehumidifier is regenerated. After the cold blowing of the first molecular sieve adsorber 1 is finished, the first automatic control valve 7 and the fifth automatic control valve 11 are closed, the third three-way valve 27 and the fourth three-way valve 28 are switched simultaneously, the first air pretreatment branch 42 is in an open state, the first fan 33 is closed, the first pressure increasing valve 14 is opened, the pressure increasing is started, after the pressure increasing is finished, the first pressure increasing valve 14 is closed, the sixth automatic control valve 13 and the second automatic control valve 8 are opened, and the first molecular sieve adsorber 1 starts to adsorb. And closing the fourth automatic control valve 10 and the eighth automatic control valve 17, and finishing the adsorption state of the second molecular sieve adsorber 2.
And entering the stage I again to finish the circulation.
The first three-way valve 25 and the second three-way valve 26 are always in the state where the first air pretreatment bypass 42 is opened, and the fifth three-way valve 29 and the sixth three-way valve 30 are always in the state where the second air pretreatment bypass 43 is opened. And only when the corresponding heat pipe dehumidification heat exchanger fails, the corresponding heat pipe dehumidification heat exchanger is switched to the air pretreatment branch closing state.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A molecular sieve purifying device utilizing a heat pipe dehumidification heat exchanger is characterized by comprising: the device comprises a first molecular sieve adsorber (1), a second molecular sieve adsorber (2), a first heater (3), a second heater (4), a first heat pipe dehumidification heat exchanger (5), a second heat pipe dehumidification heat exchanger (6), a first fan (33), a second fan (34), a first dehumidifier regeneration channel (35), a second dehumidifier regeneration channel (36), a waste nitrogen heating channel (37), a waste nitrogen cold blowing channel (38), an air outlet channel (39), a first air inlet channel (40), a second air inlet channel (41), a first air pretreatment branch (42), a second air pretreatment branch (43), a waste nitrogen emptying channel (44) and a waste nitrogen inlet channel (45);
a shell (52) is arranged outside the first heat pipe dehumidification heat exchanger (5) and the second heat pipe dehumidification heat exchanger (6), the interior of the shell is divided into a pretreatment air channel (47) and a regeneration air channel (49) through a partition plate (48), wherein a solid adsorption material with the regeneration temperature lower than that of molecular sieve particles is coated on fins (50) in the pretreatment air channel (47);
a pipeline at one end of the first molecular sieve adsorber (1) is divided into two branches, the first branch is connected with a sewage nitrogen gas inlet channel (45), the second branch is connected with an air outlet channel (39), a first automatic control valve (7) is arranged on the first branch, and a second automatic control valve (8) is arranged on the second branch; the other end of the first molecular sieve adsorber (1) is connected with a first air inlet channel (40) through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for leading air to be purified into the first air inlet channel (40), the third branch and the fourth branch are both connected with a waste nitrogen gas emptying channel (44) through a regeneration air channel (49) of the first heat pipe dehumidification heat exchanger (5), and a sixth automatic control valve (13), a first pressure increasing valve (14), a first pressure relief valve (12) and a fifth automatic control valve (11) are respectively arranged on the first branch, the second branch, the third branch and the fourth branch; a first three-way valve (25) and a second three-way valve (26) are sequentially connected to a first air inlet channel (40) between the second branch and the third branch, one end of a first air pretreatment branch (42) in the fifth branch is connected to a valve port of the second three-way valve (26), then the third three-way valve (27), a pretreatment air channel (47) of the first heat pipe dehumidification heat exchanger (5) and a fourth three-way valve (28) are sequentially connected, the other end of the first air pretreatment branch (42) is connected to a valve port of the first three-way valve (25), and the first three-way valve (25) and the second three-way valve (26) are used for controlling the opening and closing of the first air pretreatment branch (42); the valve ports of the third three-way valve (27) and the fourth three-way valve (28) which are not connected with the first air pretreatment branch (42) are connected with a first dehumidifier regeneration channel (35), a first fan (33) is arranged on the first dehumidifier regeneration channel (35), and the opening and closing of the first dehumidifier regeneration channel (35) are controlled by the third three-way valve (27) and the fourth three-way valve (28);
a pipeline at one end of the second molecular sieve adsorber (2) is divided into two branches, the first branch is connected with a sewage nitrogen gas inlet channel (45), the second branch is connected with an air outlet channel (39), the first branch is provided with a third automatic control valve (9), and the second branch is provided with a fourth automatic control valve (10); the other end of the second molecular sieve adsorber (2) is connected with a second air inlet channel (41) through a pipeline and is divided into five branches, the first branch and the second branch are both connected with an air inlet to be purified and used for leading air to be purified into the second air inlet channel (41), the third branch and the fourth branch are both connected with a polluted nitrogen gas emptying channel (44) through a regeneration air channel (49) of the second heat pipe dehumidification heat exchanger (6), and an eighth automatic control valve (17), a second pressure increasing valve (18), a second pressure relief valve (16) and a seventh automatic control valve (15) are respectively arranged on the first branch, the second branch, the third branch and the fourth branch; a fifth three-way valve (29) and a sixth three-way valve (30) are sequentially connected to a second air inlet channel (41) between the second branch and the third branch, one end of a second air pretreatment branch (43) in the fifth branch is connected to a valve port of the sixth three-way valve (30), then a seventh three-way valve (31), a pretreatment air channel (47) of the second heat pipe dehumidification heat exchanger (6) and an eighth three-way valve (32) are sequentially connected, the other end of the second air pretreatment branch (43) is connected to a valve port of the fifth three-way valve (29), and the opening and closing of the second air pretreatment branch (43) are controlled through the fifth three-way valve (29) and the sixth three-way valve (30); the valve ports of the seventh three-way valve (31) and the eighth three-way valve (32) which are not connected with the second air pretreatment branch (43) are connected with a second dehumidifier regeneration channel (36), a second fan (34) is arranged on the second dehumidifier regeneration channel (36), and the opening and closing of the second dehumidifier regeneration channel (36) are controlled by the seventh three-way valve (31) and the eighth three-way valve (32);
dividing the waste nitrogen entering the molecular sieve purification device into two paths; one path is introduced into a waste nitrogen cold blowing channel (38), a waste nitrogen cold blowing control valve (24) is arranged on the channel, and the waste nitrogen cold blowing channel (38) is connected into a waste nitrogen inlet channel (45); the other path is introduced into a sewage nitrogen heating channel (37), a sewage nitrogen heating control valve (23) is arranged on the sewage nitrogen heating channel, a channel behind the sewage nitrogen heating control valve (23) is divided into two branches, the first branch is sequentially connected with an eleventh automatic control valve (21), a first heater (3) and a ninth automatic control valve (19), the second branch is sequentially connected with a twelfth automatic control valve (22), a second heater (4) and a tenth automatic control valve (20), and the two branches are connected into a sewage nitrogen inlet channel (45) after being converged; the flow direction of the waste nitrogen is switched by opening and closing a waste nitrogen heating control valve (23) and a waste nitrogen cold blowing control valve (24);
introducing air to be purified from a first air inlet channel (40) or a second air inlet channel (41) into a first molecular sieve adsorber (1) or a second molecular sieve adsorber (2) for purification; the purified air is discharged from the air outlet passage (39).
2. The molecular sieve purifying apparatus using a heat pipe dehumidification heat exchanger as claimed in claim 1, wherein said first heat pipe dehumidification heat exchanger (5) is disposed before the first molecular sieve adsorber (1); the second heat pipe dehumidification heat exchanger (6) is arranged in front of the second molecular sieve adsorber (2) and is used for pretreating air entering the molecular sieve.
3. The molecular sieve purifying apparatus using a heat pipe dehumidification heat exchanger as claimed in claim 1, wherein in the first heat pipe dehumidification heat exchanger (5) and the second heat pipe dehumidification heat exchanger (6), the fins (50) inside the pre-treatment air channel (47) are coated with a solid adsorption material having a regeneration temperature lower than that of the molecular sieve particles, and the solid adsorption material comprises silica gel and activated carbon.
4. The molecular sieve purifying apparatus using heat pipe dehumidifying heat exchanger as claimed in claim 3, wherein in the first heat pipe dehumidifying heat exchanger (5) and the second heat pipe dehumidifying heat exchanger (6), a plurality of fins (50) are provided on the heat pipe (51) in the pre-process air passage (47) and the regeneration air passage (49).
5. The molecular sieve purifying apparatus using a heat pipe dehumidifying heat exchanger as claimed in claim 1, wherein when the first heat pipe dehumidifying heat exchanger (5) is regenerated, the first fan (33) of the first dehumidifier regeneration channel (35) is turned on; when the second heat pipe dehumidification heat exchanger (6) is regenerated, a second fan (34) on a second dehumidifier regeneration channel (36) is started.
6. The molecular sieve purifying apparatus using a heat pipe dehumidification heat exchanger as recited in claim 1, wherein said first air pre-treatment branch (42) is provided with a first three-way valve (25), a second three-way valve (26), a third three-way valve (27), and a fourth three-way valve (28); and a fifth three-way valve (29), a sixth three-way valve (30), a seventh three-way valve (31) and an eighth three-way valve (32) which are arranged on the second air pretreatment branch (43) control the opening states of different pipelines through valve switching.
7. The molecular sieve purification apparatus using a heat pipe dehumidification heat exchanger as claimed in claim 1, wherein a silencer (46) is provided at a vent position at the end of the dirty nitrogen vent channel (44).
8. The molecular sieve purifying apparatus using a heat pipe dehumidification heat exchanger as claimed in claim 1, wherein one of the first heater (3) and the second heater (4) is operated and the other is on standby.
9. An air purification method using the molecular sieve purification apparatus as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
1) firstly, air to be purified enters a first heat pipe dehumidification heat exchanger (5) for pretreatment through a first air pretreatment branch (42) through valve switching, the content of water and carbon dioxide in the air is preliminarily reduced, then the air enters a first molecular sieve adsorber (1), and the first molecular sieve adsorber (1) starts to be in an adsorption state; the second molecular sieve adsorber (2) is saturated in adsorption, the second molecular sieve adsorber starts heating regeneration after pressure relief is carried out by switching a second pressure relief valve (16), waste nitrogen for heating regeneration enters the first heater (3) or the second heater (4) for heating and temperature rise, and enters the second molecular sieve adsorber (2) for heating regeneration of the molecular sieve after the temperature reaches a set temperature; after the second molecular sieve adsorber (2) is heated, dirty nitrogen directly enters the second molecular sieve adsorber (2) through a dirty nitrogen cold blowing channel (38) and a dirty nitrogen air inlet channel (45) through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters a second heat pipe dehumidification heat exchanger (6) through a dirty nitrogen emptying channel (44) and is emptied, a solid adsorption material in the second heat pipe dehumidification heat exchanger (6) absorbs waste heat inside the cold blowing discharged dirty nitrogen through heat pipes to complete regeneration, a second dehumidifier regeneration channel (36) is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a second fan (34); after the cold blowing is finished, the second heat pipe dehumidification heat exchanger and the second molecular sieve adsorber finish regeneration, and the second molecular sieve adsorber (2) starts to be pressurized through valve switching;
2) then, the air to be purified enters a second heat pipe dehumidification heat exchanger (6) through a second air pretreatment branch (43) through valve switching for pretreatment, the content of water and carbon dioxide in the air is reduced preliminarily, and then the air enters a second molecular sieve adsorber (2), and the second molecular sieve adsorber (2) is in an adsorption state; the first molecular sieve adsorber (1) is saturated in adsorption, the first pressure relief valve (12) is switched to relieve pressure and then the first molecular sieve adsorber starts heating regeneration, waste nitrogen used for heating regeneration enters the first heater (3) or the second heater (4) to be heated and heated, and enters the first molecular sieve adsorber (1) to heat and regenerate the molecular sieve after the waste nitrogen reaches a set temperature; after the first molecular sieve adsorber (1) is heated, dirty nitrogen directly enters the first molecular sieve adsorber (1) through a dirty nitrogen cold blowing channel (38) and a dirty nitrogen air inlet channel (45) through valve switching, a cold blowing process is started, dirty nitrogen discharged by cold blowing enters a first heat pipe dehumidification heat exchanger (5) through a dirty nitrogen emptying channel (44) and is emptied, solid adsorption materials in the first heat pipe dehumidification heat exchanger (5) absorb waste heat in the cold blowing dirty nitrogen through heat pipes to complete regeneration, a first dehumidifier regeneration channel (35) is opened through valve switching, and high-humidity gas generated in the regeneration process is discharged through a first fan (33); after cold blowing is finished, the first heat pipe dehumidification heat exchanger and the first molecular sieve adsorber finish regeneration, and the first molecular sieve adsorber (1) starts to be pressurized through valve switching;
3) and (5) continuously circulating the steps 1) to 2) to finish the air separation purification.
10. The air purification method as claimed in claim 9, wherein the first heater (3) and the second heater (4) are alternatively operated by switching; and after the heating regeneration process is finished, the first heater (3) or the second heater (4) stops heating.
CN201811141439.0A 2018-09-28 2018-09-28 Molecular sieve purifying device and method utilizing heat pipe dehumidification heat exchanger Expired - Fee Related CN109289818B (en)

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CN1919417A (en) * 2006-08-23 2007-02-28 北京科技大学 Heat-recovering and utilizing type three-molecular screen alternating-temperature adsorption air purification process and device
CN104368221A (en) * 2014-11-14 2015-02-25 杰瑞石油天然气工程有限公司 Device for dewatering and dealkylating methane-rich gas
CN108067083A (en) * 2018-01-24 2018-05-25 德阳天赐塑胶有限责任公司 A kind of coating complex machine device for recycling exhaust gas

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CN1919417A (en) * 2006-08-23 2007-02-28 北京科技大学 Heat-recovering and utilizing type three-molecular screen alternating-temperature adsorption air purification process and device
CN104368221A (en) * 2014-11-14 2015-02-25 杰瑞石油天然气工程有限公司 Device for dewatering and dealkylating methane-rich gas
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