CN115193230A - Compressed air drying assembly system and regeneration pipeline temperature control method - Google Patents
Compressed air drying assembly system and regeneration pipeline temperature control method Download PDFInfo
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- CN115193230A CN115193230A CN202210903319.XA CN202210903319A CN115193230A CN 115193230 A CN115193230 A CN 115193230A CN 202210903319 A CN202210903319 A CN 202210903319A CN 115193230 A CN115193230 A CN 115193230A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/02—Separation 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
- B01D53/04—Separation 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 with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0438—Cooling or heating systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/02—Separation 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
- B01D53/04—Separation 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 with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
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- Drying Of Gases (AREA)
Abstract
The invention relates to the field of dryers and discloses a compressed air drying assembly system.A main check valve is used for allowing air dried by a drying assembly to flow into an air outlet and simultaneously preventing dried compressed air from flowing into the drying assembly through the main check valve; the regeneration loop comprises a one-way valve and a throttle valve which are connected in series, and is used for back blowing the compressed air at the air outlet to the drying component for regeneration; the regeneration loop also comprises a control pipeline connected with the pilot valve of the unloading valve; the electromagnetic valve is connected between the air outlet and the regeneration pipeline and is used for controlling the on-off of the regeneration pipeline; the electromagnetic valve is also connected with the control unit, and the control unit controls the action of the electromagnetic valve; the heating unit is connected with the control unit, and the control unit controls the heating unit to start and stop; the heating unit is disposed at one side of the regeneration circuit for heating the compressed air within the regeneration circuit. The dryer system has the advantages of strong regeneration capability, low-temperature freezing prevention and the like.
Description
Technical Field
The invention relates to the field of compressed air drying and regeneration, in particular to a compressed air drying assembly system and a control method.
Background
Compressed air consumers of commercial vehicles require clean and dry compressed air. Chinese patent CN201580026506.2 discloses a compressed air drying system. One practical method, the principle of which is to remove moisture from compressed air, is the so-called pressure swing adsorption process. Compressed air supplied by an air compressor passes through an air dryer assembly cartridge filled with a porous material, known as desiccant. During the passage of air through the drying assembly cartridge, water molecules become trapped in the pores of the desiccant and the relative humidity of the compressed air is reduced. This phase is called the loading phase. After the compressor completes the air delivery, it is necessary to remove the trapped water molecules from the desiccant. This is achieved by a throttle valve expanding a portion of the compressed and dried air. The relative humidity of the already dried air drops sharply due to the pressure drop of the compressed air. This extremely dry air is directed into the dry component cartridge, carrying air molecules trapped in the desiccant away, and discharged to the environment through an unloader valve. This is the regeneration phase of the air drying assembly. After the regeneration phase has been completed, the air drying assembly switches to a so-called lock-up phase if there is no need to supply more compressed air to the air consuming device. During the regeneration and lock-up phases, the air compressor is turned off by an electronic or pneumatic signal, which is controlled by an internal or separate electronic control unit.
Due to high air consumption or leakage in the vehicle compressed air system, it may happen that the available air for regeneration is not sufficient to completely remove the residual moisture in the desiccant. It may also happen that the time between two duty cycles is not long enough to provide a suitable amount of compressed air for regeneration, since the flow rate of the regeneration air is limited and a suitable expansion ratio cannot be ensured. For both cases, the regeneration process needs to be more efficient to balance the increased amount of water trapped during the loading phase.
Disclosure of Invention
In order to solve the technical problems, the invention is solved by the following technical scheme:
a compressed air drying assembly system comprising an air inlet, an air outlet, a drying assembly, a main check valve, a regeneration circuit, a solenoid valve, a control unit, and a heating element;
the air inlet is used for being pneumatically connected with the air compressor to convey compressed air into the drying assembly;
the air outlet is used for being pneumatically connected with a pneumatic component of a vehicle and conveying dried compressed air to the pneumatic component;
the main check valve is used for allowing the air dried by the drying component to flow into the air outlet and preventing the dried compressed air from flowing into the drying component through the main check valve;
the regeneration loop comprises a one-way valve and a throttle valve which are connected in series, and is used for back blowing the compressed air at the air outlet to the drying component for regeneration;
the regeneration loop also comprises a control pipeline connected with the pilot valve of the unloading valve;
the electromagnetic valve is connected between the air outlet and the regeneration pipeline and is used for controlling the on-off of the regeneration pipeline;
the electromagnetic valve is also connected with the control unit, and the control unit controls the action of the electromagnetic valve;
the heating unit is connected with the control unit, and the control unit controls the heating unit to start and stop; the heating unit is disposed at one side of the regeneration circuit for heating the compressed air within the regeneration circuit.
Preferably, the drying assembly is integrated in the drying assembly shell, a heating channel is arranged on one side of the regeneration pipeline, and the heating assembly is installed in the heating channel.
Preferably, the power of the heating assembly is no more than 150w.
Preferably, the system also comprises a temperature sensor, wherein the temperature sensor is used for collecting the temperature of the regeneration pipeline, and the temperature sensor is connected with the control unit.
Preferably, the inlet of the drying assembly is in communication with the inlet of the unloader valve.
The control unit is also connected with a vehicle power management system, and the control method comprises the following steps:
step one, acquiring the air temperature in an air drying assembly;
step two, comparing whether the temperature in the air drying assembly is larger than a preset threshold value of the system or not;
step three, if the value is smaller than a preset threshold value of the system, a step four is executed;
selecting a heater strategy, wherein the heating strategy comprises an 'always on' strategy, or a 'temperature control strategy' or a 'wet on strategy';
and step five, when the 'always on' strategy is selected, the heater is always on, whether the air drying component is overheated is judged, if so, the heater is turned off, and if not, the heater is continuously turned on.
Preferably, in the second step, when the temperature in the drying assembly is greater than or equal to the system threshold, judging whether the regeneration airflow needs to be heated; if yes, judging whether the regeneration stage is in, if so, judging whether the heater is overheated, if not, continuing to turn on the heater, and if so, turning off the heater.
Preferably, the method of determining whether the regeneration air stream needs to be heated is to calculate the amount of compressed air required in the regeneration phase from the moisture content of the desiccant; this function will then request heating of the airflow to increase regeneration efficiency if the amount of available compressed air is insufficient to regenerate the desiccant in one or a predetermined number of cycles, as compared to the amount of available compressed air for regeneration.
Preferably, the amount of compressed air used in the regeneration stage is preset to be 10% to 15% of the load stage.
Preferably, when the "wet-on strategy" is selected in step four, the heater is always turned on during the loading phase and the regeneration phase.
Through the technical scheme, the invention has the following technical effects:
thereby this scheme improves regeneration air flow's temperature through design heating mechanism to reduce the relative humidity of air. And the heating mechanism can also be applied to the condition that the parts are frozen when the temperature is lower, so that the normal use of the parts is ensured.
Drawings
Fig. 1 is a system diagram.
Fig. 2 is a schematic view of the position of the heating element.
Fig. 3 is a control flow chart.
The reference numerals in the figures are the following technical names:
1-air inlet, 2-air outlet, 3-air outlet, 4-drying component, 18-heating element, 7-control unit, 20-shell, 5-throttle valve, 6-unloading valve, 9-main check valve, 10-electromagnetic valve and 16-regeneration pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A compressed air drying assembly system comprising an air inlet 1, an air outlet 2, a drying assembly 4, a main check valve 9, a regeneration circuit, a solenoid valve 10, a control unit 7 and a heating element 18;
wherein, the air inlet 1 is used for being pneumatically connected with an air compressor to deliver compressed air into the drying component 4;
the air outlet 2 is used for being pneumatically connected with a pneumatic component of a vehicle and conveying dried compressed air to the pneumatic component;
the main check valve 9 is used for allowing the air dried by the drying assembly 4 to flow into the air outlet 2 while preventing the dried compressed air from flowing into the drying assembly 4 through the main check valve 9;
the regeneration loop comprises a check valve and a throttle valve 5 which are connected in series, and the regeneration loop is used for back blowing the compressed air at the air outlet 2 to the drying component 4 for regeneration;
the regeneration loop also comprises a control pipeline connected with the pilot valve of the unloading valve 6;
the electromagnetic valve 10 is connected between the air outlet 2 and the regeneration pipeline 16 and is used for controlling the on-off of the regeneration pipeline 16;
the electromagnetic valve 10 is also connected with the control unit 7, and the control unit 7 controls the action of the electromagnetic valve 10;
the heating unit is connected with the control unit 7, and the control unit 7 controls the heating unit to start and stop; the heating unit is disposed at one side of the regeneration circuit for heating the compressed air within the regeneration circuit.
In this embodiment, the drying component 4 is integrated in the casing 20 of the drying component 4, and a heating channel is opened on one side of the regeneration pipeline, and a heating component is installed in the heating channel. Heating element installs on casing 20 and be connected with the control, and casing 20 is heat-conducting component, and this embodiment casing 20 chooses for use the metal material.
In this embodiment, in order to avoid overheating of the housing 20, the power of the heating assembly is limited, and the power of the heating assembly is not more than 150w. The specific power can be actually selected according to the heat dissipation speed and the temperature rise speed.
In order to facilitate the collection of the temperature of the gas in the pipeline, a temperature sensor is further included in this embodiment, the temperature sensor is used for collecting the temperature of the regeneration pipeline 16, and the temperature sensor is connected with the control unit 7. The control unit 7 makes a judgment on subsequent actions such as turning on and off the heater according to the temperature of the collected temperature sensor.
In this embodiment, the inlet of the drying assembly 4 communicates with the inlet of the unloader valve 6. The unloading valve 6 is used for discharging air in the regeneration process out of the drying component 4.
The working process of the drying assembly 4 is as follows:
and in the loading stage, the air compressor compresses air, the compressed air is dried by the drying equipment, and the compressed air is conveyed to each braking chamber through the one-way valve.
When regeneration is carried out, the controller controls the electromagnetic valve 10 to open a regeneration loop, compressed air at the end of the air outlet 2 enters the drying component 4 through the throttle valve 5 to be subjected to back flushing, meanwhile, the compressed air enters the pilot cavity of the unloading valve 6 to open the unloading valve 6, and the regenerated compressed air is discharged through the air outlet 3 of the unloading valve 6.
When the temperature is lower, when regeneration efficiency is lower can't satisfy the regeneration demand, the controller opens heating element according to the temperature sensor signal of gathering, heats the regeneration air current to reduce the relative humidity of regeneration air current, get rid of the moisture in the drying assembly 4 in the regeneration process with higher speed.
Example 2
The scheme provides a temperature control method for a regeneration pipeline of a compressed air drying and regenerating system, a control unit 7 is also connected with a vehicle power supply management system, and the control method comprises the following steps:
step one, acquiring the air temperature in the air drying component 4;
step two, comparing whether the temperature in the air drying component 4 is larger than a preset threshold value of the system or not;
step three, if the value is smaller than a preset threshold value of the system, a step four is executed;
selecting a heater strategy, wherein the heating strategy comprises an 'always on' strategy, or a 'temperature control strategy' or a 'wet on strategy';
and step five, when the 'always on' strategy is selected, the heater is always on, whether the air drying component 4 is overheated or not is judged, if so, the heater is turned off, and if not, the heater is continuously turned on.
In this embodiment, in the second step, when the temperature in the drying component 4 is greater than or equal to the system threshold, it is determined whether the regeneration airflow needs to be heated; if yes, judging whether the regeneration stage is in, if so, judging whether the heater is overheated, if not, continuing to turn on the heater, and if so, turning off the heater.
Judging whether the regeneration airflow needs to be heated or not, namely calculating the amount of compressed air required by the regeneration stage according to the water content of the drying agent; this function will then request heating of the airflow to increase regeneration efficiency if the amount of available compressed air is insufficient to regenerate the desiccant in one or a predetermined number of cycles, as compared to the amount of available compressed air for regeneration. Generally, the compressed air amount in the regeneration stage is preset to be 10% -15% of the compressed air amount in the load stage.
However, when the temperature is low, or the operation is complicated, there is not enough time to recirculate the amount of compressed air required for the regeneration stage. So that in this case moisture is accumulated in the drying agent. Resulting in a decrease in drying efficiency. The amount of compressed air available in this case does not satisfy the amount of compressed air required for regeneration, so it is necessary to turn on the heating element in this case to improve the regeneration efficiency.
In this case, therefore, it is necessary to calculate the required regeneration compressed air amount from the moisture content in the desiccant. Wherein the moisture content of the desiccant is calculated as follows: since we compress the delivered air to at least 9bar, the delivered air has a relative humidity of 100%. The water amount is measured by an i-X diagram determined by the pressure and the temperature. For example, if the cartridge is operating properly, it will remove 95% of the water, with 95% being the desiccant water content.
Preferably, the amount of compressed air used in the regeneration phase is preset to 12% of the load phase.
Thereby this scheme improves regeneration air flow's temperature through design heating mechanism to reduce the relative humidity of air. And the heating mechanism can also be applied to the condition that the parts are frozen when the temperature is lower, so that the normal use of the parts is ensured.
Example 3
This embodiment is different from embodiment 2 in that: when the "wet-on strategy" is selected in step four, the heater is always turned on during the loading phase and the regeneration phase.
When the "wet-on strategy" is selected, the heater is off during the lock-in phase regardless of temperature, since the critical area is free of moisture. Only when the "wet-on strategy" is selected will the heater be turned on for both the "loading phase" and the "regeneration phase". In some cases, the heater is turned on not because the temperature is low, but to support regeneration, so the heater is turned on only during the regeneration phase. The heater is turned off when the temperature is high enough and the regeneration phase does not require heater support.
Claims (10)
1. The dry subassembly system of compressed air, its characterized in that: comprises an air inlet (1), an air outlet (2), a drying component (4), a main check valve (9), a regeneration loop, an electromagnetic valve (10), a control unit (7) and a heating element (18);
the air inlet (1) is used for being pneumatically connected with an air compressor to convey compressed air into the drying assembly (4);
the air outlet (2) is used for being pneumatically connected with a pneumatic component of a vehicle and conveying dried compressed air to the pneumatic component;
the main check valve (9) is used for allowing the air dried by the drying component (4) to flow into the air outlet (2) and preventing the dried compressed air from flowing into the drying component (4) through the main check valve (9);
the regeneration loop comprises a check valve and a throttle valve (5) which are connected in series, and the regeneration loop is used for back flushing the compressed air at the air outlet (2) to the drying component (4) for regeneration;
the regeneration loop also comprises a control pipeline connected with a pilot valve of the unloading valve (6);
the electromagnetic valve (10) is connected between the air outlet (2) and the regeneration pipeline (16) and is used for controlling the on-off of the regeneration pipeline (16);
the electromagnetic valve (10) is also connected with the control unit (7), and the control unit (7) controls the action of the electromagnetic valve (10);
the heating unit is connected with the control unit (7), and the control unit (7) controls the heating unit to start and stop; the heating unit is disposed at one side of the regeneration circuit for heating the compressed air within the regeneration circuit.
2. The compressed air drying assembly system of claim 1, wherein: the drying component (4) is integrated in the shell (20) of the drying component (4), a heating channel is arranged on one side of the regeneration pipeline, and the heating component is installed in the heating channel.
3. The compressed air drying assembly system of claim 2, wherein: the power of the heating assembly is not more than 150w.
4. The compressed air drying assembly system of claim 2, wherein: the device also comprises a temperature sensor, wherein the temperature sensor is used for collecting the temperature of the regeneration pipeline (16), and the temperature sensor is connected with the control unit (7).
5. The compressed air drying assembly system of claim 4, wherein: the inlet of the drying component (4) is communicated with the inlet of the unloading valve (6).
6. The temperature control method for the regeneration pipeline of the compressed air drying component system is characterized by comprising the following steps of: comprising a compressed air drying assembly system according to any one of claims 1 to 5, the control unit (7) being further connected to a vehicle power management system, the control method comprising the steps of:
step one, acquiring the air temperature in an air drying assembly (4);
step two, comparing whether the temperature in the air drying component (4) is larger than a preset threshold value of the system or not;
step three, if the value is smaller than a preset threshold value of the system, the step four is executed;
selecting a heater strategy, wherein the heating strategy comprises an always-on strategy, a temperature control strategy or a wet-on strategy;
and step five, when the 'always on' strategy is selected, the heater is always on, whether the air drying component (4) is overheated or not is judged, if so, the heater is turned off, and if not, the heater is continuously turned on.
7. The compressed air drying assembly system regeneration line temperature control method of claim 6, wherein: in the second step, when the temperature in the drying component (4) is greater than or equal to a system threshold value, judging whether the regeneration airflow needs to be heated or not; if yes, judging whether the regeneration stage is in, if so, judging whether the heater is overheated, if not, continuing to turn on the heater, and if so, turning off the heater.
8. The compressed air drying assembly system regeneration line temperature control method of claim 7, wherein: judging whether the regeneration airflow needs to be heated or not, namely calculating the amount of compressed air required by the regeneration stage according to the water content of the drying agent; this function will then request heating of the airflow to increase regeneration efficiency if the amount of available compressed air is insufficient to regenerate the desiccant in one or a predetermined number of cycles, as compared to the amount of available compressed air for regeneration.
9. The compressed air drying assembly system regeneration line temperature control method of claim 7, wherein: the amount of compressed air used in the regeneration phase is preset to be 10% -15% of the load phase.
10. The compressed air drying assembly system regeneration line temperature control method of claim 7, wherein: when the "wet-on strategy" is selected in step four, the heater is always turned on during the loading phase and the regeneration phase.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210903319.XA CN115193230A (en) | 2022-07-29 | 2022-07-29 | Compressed air drying assembly system and regeneration pipeline temperature control method |
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| CN202210903319.XA CN115193230A (en) | 2022-07-29 | 2022-07-29 | Compressed air drying assembly system and regeneration pipeline temperature control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115920605A (en) * | 2023-02-01 | 2023-04-07 | 杭州嘉隆气体设备有限公司 | Compression heat regeneration dryer and control method |
| CN117753181A (en) * | 2024-02-22 | 2024-03-26 | 杭州嘉隆气体设备有限公司 | Blast heat regeneration dryer and energy efficiency evaluation method thereof |
-
2022
- 2022-07-29 CN CN202210903319.XA patent/CN115193230A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115920605A (en) * | 2023-02-01 | 2023-04-07 | 杭州嘉隆气体设备有限公司 | Compression heat regeneration dryer and control method |
| CN117753181A (en) * | 2024-02-22 | 2024-03-26 | 杭州嘉隆气体设备有限公司 | Blast heat regeneration dryer and energy efficiency evaluation method thereof |
| CN117753181B (en) * | 2024-02-22 | 2024-05-31 | 杭州嘉隆气体设备有限公司 | Regeneration method of blast heat regeneration dryer |
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