CN110548734A - Collector tube aging device and flow control method for collector tube aging - Google Patents
Collector tube aging device and flow control method for collector tube aging Download PDFInfo
- Publication number
- CN110548734A CN110548734A CN201810537513.4A CN201810537513A CN110548734A CN 110548734 A CN110548734 A CN 110548734A CN 201810537513 A CN201810537513 A CN 201810537513A CN 110548734 A CN110548734 A CN 110548734A
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- flow
- purge gas
- unit
- output
- aging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0323—Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0325—Control mechanisms therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a trap aging apparatus and a trap aging flow rate control method capable of preventing aging of a trap when a flow rate of a purge gas is too low or too high. The header aging apparatus ages a header by supplying a purge gas to the header and heating the purge gas, and includes: a flow output unit having one flow input for the purge gas and a plurality of flow outputs for the purge gas, the flow outputs being in communication with the collection header; a temperature control unit that heats the flow output unit and the collection pipe and performs temperature control; an alarm unit for outputting an alarm; and a control unit which controls the temperature control unit and the alarm unit, and makes the alarm unit output an alarm when the current output flow of the flow output end is lower than a lower flow limit value or higher than an upper flow limit value.
Description
Technical Field
The invention relates to a collector tube aging device and a flow control method for collector tube aging
Background
In the field of chromatographic instrumentation, thermal desorption collection tubes are common sampling devices in laboratories, and after use, the collection tubes are often aged to remove sample residues. Aging of the trap pipe refers to a process of blowing out the residue in the trap pipe under a certain inert gas flow (such as nitrogen and the like) at a high temperature to regenerate the trap pipe. The purge gas flow rate is usually set to 50-80 ml (single catch tube).
Disclosure of Invention
technical problem to be solved
In the prior art, for example, as shown in fig. 1, the header aging apparatus 100 includes a flow output unit 110 and a pressure gauge 120. The flow output unit 110 has a flow input end 111 to which purge gas is input and a plurality of (7 in the drawing) flow output ends 112 from which purge gas is output, and a plurality of collecting pipes (not shown) for aging are provided at the respective flow output ends 112 and communicate with the flow output ends 112 so that all of the purge gas output from the flow output ends 112 is purged therethrough. During the aging, the user observes the pressure gauge 120 to determine whether or not the purge gas flows through the trap pipe and the approximate flow rate of the purge gas.
However, it often takes several hours or more for the collection tube to age, during which time it is not possible for the user to keep track of the pressure gauge 120 at all times. If the purge gas is cut off or used up during the aging process, and the user does not see the change of the pointer of the pressure gauge 120 and deal with it in time, the aging capability becomes weak, the residue in the trap pipe cannot be completely purged but slowly accumulates in the trap pipe, and finally the number of times the trap pipe can be used is reduced. On the other hand, if the flow rate of the purge gas is too large, not only the cost increases due to the waste of the purge gas, but also there is a risk that the packing in the trap is blown or blown out to cause damage to the trap.
Technical means for solving the technical problem
The present invention has been made to solve the above-mentioned problems, and provides a trap aging apparatus for aging a trap by introducing purge gas into the trap and heating the purge gas, the apparatus comprising: a flow output unit having one flow input for the purge gas and a plurality of flow outputs for the purge gas, the flow outputs being in communication with the collection header; a temperature control unit that heats the flow output unit and the collection pipe and performs temperature control; an alarm unit for outputting an alarm; and a control unit which controls the temperature control unit and the alarm unit, and makes the alarm unit output an alarm when the current output flow of the flow output end is lower than a lower flow limit value or higher than an upper flow limit value.
In the above-described trap pipe aging apparatus, it is preferable that the apparatus further includes a pressure sensing unit which is provided upstream of the flow output unit, communicates with the flow input terminal, and measures a current pressure of the purge gas in the flow output unit, and the flow output terminal includes a damper pipe, and the control unit includes: the storage unit is used for storing relational expressions of temperature, pressure, damping pipe parameters and output flow as well as the lower flow limit value and the upper flow limit value in advance; a calculation unit which calculates the current output flow of the flow output end according to the relational expression by using the current temperature of the purge gas in the flow output unit, the current pressure of the purge gas measured by the pressure sensing unit and the parameters of the damping pipe; and a comparison unit that compares the calculated current output flow rate with the flow rate lower limit value and the flow rate upper limit value.
In the above-described trap header aging apparatus, it is preferable that the current temperature of the purge gas is obtained by reading in real time from the temperature control unit.
in the above-described trap header aging apparatus, it is preferable that the parameter of the damper tube is the aperture and/or the length of the damper tube.
In the above-described collection pipe aging apparatus, it is preferable that the control unit further stops the heating by the temperature control unit when the current output flow rate at the flow rate output terminal is lower than a lower flow rate limit value.
in the above-described header aging apparatus, it is preferable that the alarm unit outputs an alarm in the form of one or more of lighting, giving a buzzer, and displaying characters.
The present invention also provides a flow control method for aging a trap pipe by introducing a purge gas into the trap pipe and heating the same, the flow control method for aging a trap pipe being characterized in that an alarm is output in a case where a current output flow rate of the purge gas output to the trap pipe is lower than a lower flow rate limit value or higher than an upper flow rate limit value.
In the above-described flow rate control method for degradation of the purge header, it is preferable that the current output flow rate is calculated based on a current temperature of the purge gas in the purge header, a current pressure of the purge gas, and parameters of a damper tube for generating a flow resistance to the purge gas.
In the method of controlling the flow rate for aging of the collecting pipe, it is preferable that the heating of the collecting pipe is also stopped when the current output flow rate is lower than the flow rate lower limit value.
in the flow rate control method for the deterioration of the collecting pipe, it is preferable that the alarm is output so as to turn on a lamp, generate a buzzer, or display a character.
effects of the invention
According to the aging device for the collecting pipe and the flow control method for aging the collecting pipe, aging can be avoided under the condition that the flow of the purge gas is too low or too high, the aging capability of an instrument is ensured, the use frequency of the collecting pipe is prolonged, in addition, the cost can be reduced, and the damage of the collecting pipe is prevented.
Drawings
FIG. 1 is a schematic diagram of a prior art header aging apparatus 100.
fig. 2 is a schematic structural view of a header aging apparatus 200 according to an embodiment of the present invention.
Fig. 3 is a flowchart of a flow rate control method for aging of a collection pipe according to an embodiment of the present invention.
Detailed Description
Fig. 2 is a schematic structural view of a header aging apparatus 200 according to the present embodiment. The header aging apparatus 200 includes a flow output unit 210 and a temperature control unit 220. The flow output unit 210 has a flow input end 211 for inputting the purge gas and a plurality of (7 in the figure for example) flow output ends 212 for outputting the purge gas, and the output flows of the flow output ends 212 are consistent with each other. A plurality of collecting pipes (not shown) for aging are provided at each flow output end 212 and communicate with the flow output end 212, so that the purge gas output from the flow output end 212 is entirely purged through the collecting pipes. In the burn-in test, the flow output unit 210 is placed in a column oven, and heating is performed by the temperature control unit 220, and the temperature of the column oven (i.e., the temperature of the flow output unit 210 and the trap pipe) is accurately controlled to a set value.
the header aging apparatus 200 further includes an alarm unit 250 for outputting an alarm and a control unit 240, and the control unit 240 controls the temperature control unit 220 and the alarm unit 250.
In the present invention, in order to avoid the adverse effect of too low or too high flow rate of the purge gas, the control unit 240 is configured to: in the case where the current output flow rate of each flow rate output end 212 of the flow rate output unit 210 is lower than a preset lower flow rate limit value or higher than a preset upper flow rate limit value, the alarm unit 250 is caused to output an alarm. In addition, when the flow rate is lower than the lower limit value, the control unit 240 may stop the heating of the temperature control unit 220 at the same time.
The user can take various measures after receiving the alarm, such as changing the gas source supplying the purge gas under the condition that the flow rate is lower than the lower flow limit value and even the purge gas is used up; and when the flow rate is higher than the upper limit value of the flow rate, reducing the flow rate of the purge gas, and the like. The form of outputting the alarm may be any one or more of lighting (for example, red light), giving a buzzer or displaying a character, or may be other forms.
The following describes a method for acquiring the current output flow at the flow output end 212 of the flow output unit 210.
In order to obtain the current output flow rate, in the present embodiment, calculation is performed based on a physical quantity such as pressure.
Specifically, a pressure sensing unit 230 is disposed on the flow path of the purge gas upstream of the flow output unit 210, and is communicated with the flow input end 211 of the flow output unit 210, for measuring the current pressure of the purge gas in the flow output unit 210. Further, a stainless damper tube for generating flow resistance against the purge gas is provided in the flow output end 212. According to the difference of the aperture and the length of the damping tube, different circulation resistances can be provided for the purging gas. In the present embodiment, in order to match the output flow rates of the flow rate output ends 212 with each other, it is preferable to match the parameters of the damping pipes with each other.
The flow value of the purge gas flowing out of the flow output 212 depends on the current temperature, the current pressure, and the parameters (bore diameter and/or length) of the damper tube of the purge gas in the flow output unit 210. The control unit 240 includes a storage unit 241, a calculation unit 242, and a comparison unit 243. The storage unit 241 stores the relational expression between the temperature, the pressure, the damping tube parameter, and the output flow rate in advance, and the relational expression may be provided by a product manufacturer or may be obtained by measurement in advance through experiments. The calculating unit 242 calculates the current output flow rate of the flow output end 212 of the flow output unit 210 according to the above relation from the current temperature of the purge gas in the flow output unit 210 (i.e. the column oven temperature), the current pressure measured by the pressure sensing unit 230, and the known parameters of the damper tube.
The storage unit 241 further stores a preset lower flow rate limit and a preset upper flow rate limit, and the comparison unit 243 compares the current output flow rate calculated by the calculation unit 242 with the lower flow rate limit and the upper flow rate limit. Thus, the alarm unit 250 outputs an alarm when the current output flow rate of the flow rate output end 212 is lower than a preset lower flow rate limit value or higher than a preset upper flow rate limit value.
In the above embodiment, in order to obtain the current output flow rate at the flow rate output end 212, calculation is performed based on the temperature, the pressure, and the damper pipe parameter, but the present invention is not limited thereto, and for example, flow rate measurement means such as a mass flow meter may be provided in the flow path, and whether or not to output an alarm may be determined based on the measured flow rate value. In this case, the pressure sensing unit 230 and the calculating unit 242 may be omitted, and the damping tube may not be provided.
The following describes a flow rate control method for aging of a collection pipe according to the present embodiment.
FIG. 3 is a flowchart of the flow control method for aging of the trap pipe.
In the method for controlling the flow rate for degradation of the collection pipe, first, in step S301, it is determined whether or not the current output flow rate of the purge gas output to the collection pipe is lower than a preset lower flow rate limit value.
If it is determined as "yes", the process proceeds to step S302, where heating of the collection pipe is stopped, an alarm is output, and the flow ends.
If the determination is "no", the process proceeds to step S303, where it is determined whether or not the current output flow rate of the purge gas to be output to the collection pipe is higher than a preset flow rate upper limit value.
If yes, the process proceeds to step S304, where an alarm is output, and the flow ends.
If the determination is "no", the process returns to S301 to execute the determination in a loop.
As described above, the current output flow rate of the purge gas to the trap may be calculated from the current temperature of the purge gas in the trap, the current pressure of the purge gas, and parameters of the damper tube for generating resistance to the purge gas, or may be measured by providing a flow rate measurement unit such as a mass flow meter in the flow path. The form of outputting the alarm may be any one or more of lighting (for example, red light), giving a buzzer or displaying a character, or may be other forms.
[ other embodiments ]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, the manifold aging apparatus 200 may further include a display unit on which the calculated or measured current output flow is displayed, and may also simultaneously display the current pressure and the current temperature of the purge gas in the flow output unit 210.
in addition, the current temperature of the purge gas in the flow output unit 210 may be manually input by a user, or may be obtained by automatically reading data in real time from the temperature control unit 220.
Further, in order to filter the purge gas, a filtering device may be provided upstream of the flow output unit 210.
Further, in step S302 of fig. 3, when the flow rate is too low, heating of the collection pipe is stopped and an alarm is output, but the present invention is not limited thereto, and only an alarm may be output.
In the above embodiment, the damper pipe is made of stainless steel, but is not limited thereto, and any material may be used as long as it has stable properties, is resistant to high temperature, and is not easily corroded by the purge gas.
As the purge gas, nitrogen gas may be used, but other gases having stable properties may be used.
Claims (10)
1. A trap aging apparatus that ages a trap by introducing a purge gas to the trap and heating the trap, the trap aging apparatus characterized by comprising:
A flow output unit having one flow input for the purge gas and a plurality of flow outputs for the purge gas, the flow outputs being in communication with the collection header;
A temperature control unit that heats the flow output unit and the collection pipe and performs temperature control;
An alarm unit for outputting an alarm; and
and the control unit controls the temperature control unit and the alarm unit, and enables the alarm unit to output an alarm when the current output flow of the flow output end is lower than a lower flow limit value or higher than an upper flow limit value.
2. The header aging apparatus according to claim 1,
The pressure sensing unit is arranged at the upstream of the flow output unit, is communicated with the flow input end and is used for measuring the current pressure of the purge gas in the flow output unit,
A damper tube is provided in the flow output end,
The control unit includes:
the storage unit is used for storing relational expressions of temperature, pressure, damping pipe parameters and output flow as well as the lower flow limit value and the upper flow limit value in advance;
A calculation unit which calculates the current output flow of the flow output end according to the relational expression by using the current temperature of the purge gas in the flow output unit, the current pressure of the purge gas measured by the pressure sensing unit and the parameters of the damping pipe; and
A comparison unit that compares the calculated current output flow rate with the flow rate lower limit value and the flow rate upper limit value.
3. the header aging apparatus according to claim 2,
the current temperature of the purge gas is obtained by reading from the temperature control unit in real time.
4. the header aging apparatus according to claim 2,
The parameters of the damping tube are the aperture and/or the length of the damping tube.
5. The header aging apparatus according to any one of claims 1 to 4,
And the control unit also enables the temperature control unit to stop heating when the current output flow of the flow output end is lower than the lower limit value of the flow.
6. The header aging apparatus according to any one of claims 1 to 4,
The alarm unit outputs an alarm in any one or more of lighting, buzzing and displaying characters.
7. A flow control method for aging a trap by introducing a purge gas into the trap and heating the purge gas, the flow control method for aging a trap being characterized in that,
outputting an alarm in the case where the current output flow rate of the purge gas to the trap pipe is lower than a lower flow rate limit value or higher than an upper flow rate limit value.
8. The flow control method for aging of a collection pipe according to claim 7,
The current output flow rate is calculated from the current temperature of the purge gas in the trap pipe, the current pressure of the purge gas, and parameters of a damper tube for generating a flow resistance to the purge gas.
9. the flow control method for aging of a collection pipe according to claim 7 or 8,
In the event that the current output flow is below the lower flow limit, the heating of the collection pipe is also stopped.
10. The flow control method for aging of a collection pipe according to claim 7 or 8,
The alarm is output in any one or more of lighting, buzzing and displaying characters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810537513.4A CN110548734A (en) | 2018-05-30 | 2018-05-30 | Collector tube aging device and flow control method for collector tube aging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810537513.4A CN110548734A (en) | 2018-05-30 | 2018-05-30 | Collector tube aging device and flow control method for collector tube aging |
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| CN110548734A true CN110548734A (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810537513.4A Pending CN110548734A (en) | 2018-05-30 | 2018-05-30 | Collector tube aging device and flow control method for collector tube aging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816644A (en) * | 2020-12-31 | 2021-05-18 | 杭州谱育科技发展有限公司 | Device and method for detecting VOCs in water |
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Application publication date: 20191210 |