CN108106484A - A kind of device and method for preventing cryogenic heat exchanger frozen plug - Google Patents
A kind of device and method for preventing cryogenic heat exchanger frozen plug Download PDFInfo
- Publication number
- CN108106484A CN108106484A CN201810088965.9A CN201810088965A CN108106484A CN 108106484 A CN108106484 A CN 108106484A CN 201810088965 A CN201810088965 A CN 201810088965A CN 108106484 A CN108106484 A CN 108106484A
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- temperature
- heat exchanger
- cryogenic heat
- flow
- heating element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The present invention provides a kind of device and method for preventing cryogenic heat exchanger frozen plug.Described device includes：Heating element, flow monitoring device and temperature-controlling system, the heating element is wrapped in the outer surface of cryogenic heat exchanger, the temperature-controlling system includes temperature measuring equipment, adjuster and executing agency, the flow monitoring device and the temperature measuring equipment are arranged at the port of export of the cryogenic heat exchanger, the heating element is electrically connected with the temperature-controlling system, and the adjuster is used for the heater circuit conducting according to where flow electric signal and temperature signal control the executing agency to make the heating element.The device and method provided by the invention for preventing cryogenic heat exchanger frozen plug; flow signal and temperature signal are gathered by temperature-controlling system so as to which heating element be controlled to heat cryogenic heat exchanger; it is simple in structure; cost is relatively low; suitable for all kinds of cryogenic heat exchangers; heating ramp rate is fast, can greatly shorten the downtime blocked by heat exchanger, reduces economic loss.
Description
Technical field
The present invention relates to cryogenic heat exchanger field of heat exchange, prevent that cryogenic heat exchanger solidification is stifled more particularly, to one kind
The device and method of plug.
Background technology
The rapid development of regenerative resource proposes electric system new challenge, and extensive energy storage technology is applied to power grid system
System, it is poor to balance peak-trough electricity, ensures power system stability output, thus receives significant attention.Commercialized running is realized at this stage
Extensive energy storage technology there was only water-storage and compressed-air energy storage.Hydroenergy storage station is harsh to geographical environmental requirement, builds
If the cycle is long, construction investment is larger, and the addressing of compressed-air energy storage power station is relatively flexible, the non-compensation combustion type compression developed in recent years
The dependence to fossil fuel has been broken away from air energy storage, but is made the problems such as the storing of a large amount of pressure-airs, low energy storage density, security
The popularization for obtaining the technology is restricted.Liquid air energy storage technology is on the basis of compressed air energy storage technology, by high pressure sky
Gas cooling liquefaction, and normal pressure storage is carried out, the requirement of storage condition can be greatly reduced, energy storage densities also significantly improve.
Liquid air energy-storage system recycles the cold of liquid air rewarming process release to realize the sky in energy storage stage
Gas liquefaction is, it is necessary to be equipped with efficient heat transfer apparatus.Heat exchanger is widely used to stone because of its superior heat transfer performance
The fields such as oil, chemical industry, metallurgy, electric power, machinery, food, pharmacy.Cryogenic heat exchanger applied to liquid air energy-storage system is to change
One special application field of hot device operates in liquid nitrogen temperature near room temperature, it can be achieved that the high efficient heat exchanging stream of small temperature difference heat exchange
Journey.
To realize the over all Integration of liquid air energy-storage system ice chest, the design of cryogenic heat exchanger must is fulfilled for compact efficient
Requirement, i.e., in the case where meeting small temperature difference heat-exchanging state, it is desirable that heat exchanger have larger specific surface area, this is but also low-temperature heat exchange
Cold fluid and hot fluid flow channel is narrow in device.Meanwhile the operating temperature of cryogenic heat exchanger differs larger with environment, to avoid leaking
Heat, cryogenic heat exchanger are integrally placed in ice chest, filling pearlife thermal insulation protection in ice chest.
Cryogenic heat exchanger due to above-mentioned own structural characteristics and use environment, when cold fluid and hot fluid include high-solidification point impurity into
Point or during heat transfer process off-design operating mode, working medium or other impurity component temperature are reduced to below its solidification point, are easily occurred solidifying
Knot, causes fluid passageway to block, influences system worked well.In existing solution, mainly by the way of nature rewarming, i.e.,
Leaking heat by system makes cryogenic heat exchanger heat up, coagulated substance fusing.However, insulation makes leaking heat smaller in system, change
Hot device temperature recovery is slower, and blockage problem can not be solved timely and effectively.For liquid air energy-storage system, cryogenic heat exchanger blocks up
Plug will seriously affect the normal operation of whole system, therefore the solution of rapid rewarming seems more important.
The content of the invention
The present invention provides a kind of device and method for overcoming the above problem or solving the above problems at least partly.
According to an aspect of the present invention, a kind of device for preventing cryogenic heat exchanger frozen plug is provided.One kind prevents low
The device of warm heat exchanger frozen plug, including：Heating element, flow monitoring device and temperature-controlling system, the heating element winding
In the outer surface of cryogenic heat exchanger, the temperature-controlling system includes temperature measuring equipment, adjuster and executing agency, the flow monitoring dress
The port of export that the cryogenic heat exchanger is arranged at the temperature measuring equipment is put, the heating element is electrically connected with the temperature-controlling system
It connects, the adjuster is used for according to where flow electric signal and temperature signal control the executing agency to make the heating element
Heater circuit conducting.
Preferably, the flow monitoring device and the temperature measuring equipment are electrically connected with the adjuster, the adjuster with
Executing agency's electrical connection, the executing agency are arranged in the heater circuit of the heating element.
Preferably, the executing agency further includes：Variable resistor, the variable resistor are arranged in series in the heating element
Heater circuit in.
Preferably, connected between the heating element and the temperature-controlling system using explosion-proof electric wire and anti-explosion terminal box, institute
It states anti-explosion terminal box inner wall and scribbles are-tight paint.
According to another aspect of the present invention, a kind of method for preventing cryogenic heat exchanger frozen plug is provided, including：
When the working medium in cryogenic heat exchanger starts solidification, the flow electric signal of flow monitoring device output weakens, thermometric
The temperature signal of device output weakens, and adjuster only detects that flow electric signal is less than flow signal threshold value and temperature at the same time
When electric signal is less than temperature signal threshold value, control executing agency acts the heater circuit conducting so where heating element；
When the working medium in cryogenic heat exchanger starts fusing, the flow electric signal enhancing of the flow monitoring device output,
When the adjuster detects that flow electric signal is more than flow signal threshold value, the executing agency is controlled to disconnect the heating electricity
Road.
Preferably, the flow signal threshold value and the temperature signal threshold value are according to cryogenic heat exchanger under different use environments
Working medium occur frozen plug critical point determine.
The device and method provided by the invention for preventing cryogenic heat exchanger frozen plug gathers flow by temperature-controlling system and believes
Number and temperature signal so as to control heating element to cryogenic heat exchanger heat, simple in structure, cost is relatively low, suitable for all kinds of low temperature
Heat exchanger, heating ramp rate is fast, can greatly shorten the downtime blocked by heat exchanger, reduces economic loss.
Description of the drawings
Fig. 1 is the structure diagram according to a kind of device for preventing cryogenic heat exchanger frozen plug of the present invention；
Reference numeral：
1- cryogenic heat exchangers；2- heating elements；3- flow monitoring devices；
4- temperature measuring equipments；5- temperature regulating devices；6- adjusters；
7- executing agencies.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Fig. 1 a kind of structure diagrams for the device for preventing cryogenic heat exchanger frozen plug according to the present invention, such as Fig. 1 institutes
Show, a kind of device for preventing cryogenic heat exchanger frozen plug, including：Heating element 2, flow monitoring device 3 and temperature-controlling system 5,
Heating element 2 is wrapped in the outer surface of cryogenic heat exchanger 1, and temperature-controlling system 5 includes temperature measuring equipment 4, adjuster 6 and executing agency 7,
Flow monitoring device 3 and temperature measuring equipment 4 are arranged at the port of export of cryogenic heat exchanger 1, and heating element 2 is electrically connected with temperature-controlling system 5
It connects, adjuster 6 is used to control execution machine according to the flow electric signal of flow monitoring device 3 and the temperature signal of temperature measuring equipment 4
Structure 7 acts, so that the heater circuit conducting where heating element 2.
Specifically, heating element 2 uses resistance wire or fever tablet, it is directly wound in the surface of cryogenic heat exchanger 1, is
Extend the service life of heating element, armouring resistance wire or fever tablet can be used.Flow monitoring device 3 and temperature measuring equipment 4 fill
It is located at the port of export of cryogenic heat exchanger 1, flow monitoring device 3 goes out the flow of working medium and to 6 feedback flow of adjuster for detection stream
Electric signal is measured, temperature measuring equipment 4 goes out the temperature of working medium and to 6 feedback temperature electric signal of adjuster for detection stream.Also, heating unit
Part 2 is electrically connected with temperature-controlling system 5, the adjuster 6 in temperature-controlling system 5 be used for according to the flow electric signal of flow monitoring device 3 and
The temperature signal of temperature measuring equipment 4 so as to which the heater circuit where executing agency 7 is controlled to make heating element 2 turns on, is realized to low
The computer heating control of warm heat exchanger 1, and using measured temperature as feedback signal, the temperature of heat exchanger is made to rise to setting value,
The time of working medium frozen plug is reduced, improves system work efficiency.Wherein, executing agency 7 is relay, is controlled by relay
The conducting and disconnection of heater circuit；Flow monitoring device 3 is orifice flowmeter, and the flow measurement being suitable under a variety of warm areas is surveyed
Accuracy of measurement is higher；Temperature measuring equipment 4 is temperature sensor, including thermoelectricity occasionally thermal resistance.
The device for preventing cryogenic heat exchanger frozen plug that above-described embodiment provides, flow signal is gathered by temperature-controlling system
With temperature signal so as to which heating element be controlled to heat cryogenic heat exchanger, simple in structure, cost is relatively low, is changed suitable for all kinds of low temperature
Hot device, heating ramp rate is fast, can greatly shorten the downtime blocked by heat exchanger, reduces economic loss.
On the basis of above-described embodiment, further, flow monitoring device 3 and temperature measuring equipment 4 are electrically connected with adjuster 6
It connects, adjuster 6 is electrically connected with executing agency 7, and executing agency 7 is arranged in the heater circuit circuit at 2 place of heating element.
Specifically, the physical circuit connection relation of temperature-controlling system is further detailed in the present embodiment, flow monitoring
Device 3 and temperature measuring equipment 4 are electrically connected with adjuster 6, so as to which the flow electric signal measured and temperature signal data are transmitted to
In adjuster 6, adjuster 6 carries out condition judgment, according to judging result according to the flow electric signal and temperature signal received
Control instruction is sent to executing agency 7, executing agency 7, which connects, to be located in the heater circuit circuit at 2 place of heating element, so as to logical
The switch for crossing executing agency 7 realizes that heating element 2 controls the temperature of cryogenic heat exchanger 1, and is closed flow monitoring as device
The reference conditions closed.
On the basis of the various embodiments described above, further, executing agency 7 further includes：Variable resistor, variable resistor series connection
It is arranged in the heater circuit of heating element 2.
Specifically, the present embodiment further optimizes the structure of executing agency 7, by setting variable resistor, adjusts in time
The heating power of heating element 2 improves heating efficiency.Using the temperature value that temperature measuring equipment 4 measures as the anti-of adjusting heating power
Feedback signal is identified and given out actuating signal by adjuster 6, and executing agency 7 is by the action command of response regulator 6, so as to change
Become the resistance value of variable resistor.When heating temperature of the temperature less than setting, adjuster 6 controls executing agency 7 to reduce heater circuit
The resistance value of variable resistor in circuit increases the voltage of heating element, so as to increase the heating power of heating element；When temperature connects
When closely or reaching the heating temperature of setting, adjuster 6 controls executing agency 7 to increase the resistance value of variable resistor, makes heating element work(
Rate reduces, and whole process adjusts program by adjuster internal PID and accurately controls.
The device for preventing cryogenic heat exchanger frozen plug that above-described embodiment provides, it is variable by being added in executing agency
Resistance so as to realize the control of heating power by adjusting the resistance value of variable resistor, improves the efficiency of heating surface, further reduces low temperature
The time of heat exchanger frozen plug.
On the basis of the various embodiments described above, explosion-proof electric wire and explosion-proof wiring are used between heating element 2 and temperature-controlling system 5
Box connects, and anti-explosion terminal box inner wall scribbles are-tight paint.Since most of cryogenic heat exchanger is used in liquid air energy storage, air point
From and the fields such as petrochemical industry, working environment is more complicated, and therefore, electric wire and terminal box to device are required for using having
The material of certain explosive-proof grade, to adapt to the operating mode of various complexity.
On the basis of the various embodiments described above, a kind of method for preventing cryogenic heat exchanger frozen plug, including：When low temperature changes
During working medium frozen plug in hot device, the flow electric signal of flow monitoring device output weakens, the temperature electricity of temperature measuring equipment output
Signal weakens, and adjuster only detects that flow electric signal is less than flow signal threshold value and temperature signal is believed less than temperature at the same time
During number threshold value, control executing agency acts the heater circuit conducting so where heating element；When the whole temperature of cryogenic heat exchanger
Degree rises, when the working medium in cryogenic heat exchanger melts, the flow electric signal enhancing of the flow monitoring device output, and the adjusting
When device detects that flow electric signal is more than flow signal threshold value, the executing agency is controlled to disconnect the heater circuit.
Specifically, flow monitoring device and temperature measuring equipment are installed in the port of export of cryogenic heat exchanger, flow monitoring device
Go out the flow of working medium and to regulator feedback flow electric signal for detection stream, temperature measuring equipment goes out the temperature of working medium for detection stream
And to regulator feedback temperature signal.When the working medium in cryogenic heat exchanger solidifies, the stream of flow monitoring device output
Amount electric signal can weaken, and the temperature signal of temperature measuring equipment output can also weaken, and adjuster only detects flow telecommunications at the same time
When number being less than flow signal threshold value and temperature signal and being less than temperature signal threshold value, control executing agency is acted so that heating element
The heater circuit conducting at place.
Wherein, temperature signal is less than the necessary condition that is turned on as heater circuit of temperature signal threshold value, primarily for
Security consideration prevents error starting, when heat exchanger shutdown does not work, meets the requirement that flow electric signal is less than flow signal threshold value,
But the requirement that temperature signal is less than temperature signal threshold value is unsatisfactory for, at this moment adjuster control actuator cut-out heater circuit；When
Heat exchanger must meet flow electric signal less than flow signal threshold value and temperature electricity simultaneously when working medium solidification occurs in working stage
Signal is less than temperature signal threshold value, could turn on heater circuit at this time, avoid cryogenic heat exchanger non-operational phase starter.
When the bulk temperature of cryogenic heat exchanger rises, the working medium in cryogenic heat exchanger starts to melt, flow monitoring device
The flow electric signal of output gradually enhances, and when adjuster detects that flow electric signal is more than flow signal threshold value, control performs
Mechanism disconnects the heater circuit.
Flow signal threshold value is equivalent to the pre-set flow target value of flow electric signal, and temperature signal threshold value is equivalent to temperature
The pre-set temperature target of electric signal is spent, by the comparative result with respective pre-set desired value, is sent different
Control signal, so as to fulfill the conducting and disconnection to heater circuit.
The method for preventing cryogenic heat exchanger frozen plug that above-described embodiment provides, by adjuster to flow electric signal and
The judging result of temperature signal and preset value, realizes the computer heating control to cryogenic heat exchanger, reduce working medium frozen plug when
Between, improve system work efficiency.
On the basis of the various embodiments described above, flow signal threshold value and temperature signal threshold value are according to low under different use environments
The critical point that frozen plug occurs for the working medium of warm heat exchanger determines.It is a quantitative change that frozen plug, which occurs, for the working medium of cryogenic heat exchanger
To the process of qualitative change, during working medium slow solidification, the flow of cryogenic heat exchanger outlet can slowly reduce, while low temperature changes
The outlet temperature of hot device can also reduce, and the temperature value and flow value when working medium the critical point of frozen plug occur are determined as flow
Signal threshold value and temperature signal threshold value, when less than flow signal threshold value and temperature signal threshold value, cryogenic heat exchanger can not be just
Often work.Also, for different application environments, the flow signal threshold value and temperature of frozen plug occur for the working medium of cryogenic heat exchanger
Degree signal threshold value is different, it is necessary to specifically be determined according to actual conditions.
The device and method provided by the invention for preventing cryogenic heat exchanger frozen plug gathers flow by temperature-controlling system and believes
Number and temperature signal so as to control heating element to cryogenic heat exchanger heat, simple in structure, cost is relatively low, suitable for all kinds of low temperature
Heat exchanger, heating ramp rate is fast, can greatly shorten the downtime blocked by heat exchanger, reduces economic loss.
Finally, the apparatus and method in the present invention are only preferable embodiment, are not intended to limit the protection of the present invention
Scope.Within the spirit and principles of the invention, any modifications, equivalent replacements and improvements are made should be included in this hair
Within bright protection domain.
Claims (6)
1. a kind of device for preventing cryogenic heat exchanger frozen plug, which is characterized in that including：Heating element, flow monitoring device
And temperature-controlling system, the heating element are wrapped in the outer surface of cryogenic heat exchanger, the temperature-controlling system includes temperature measuring equipment, adjusts
Device and executing agency, the flow monitoring device and the temperature measuring equipment are arranged at the port of export of the cryogenic heat exchanger, institute
Heating element is stated to be electrically connected with the temperature-controlling system；The adjuster is used for the flow electric signal according to the flow monitoring device
Executing agency's action is controlled with the temperature signal of the temperature measuring equipment so that the heater circuit where the heating element
Conducting.
2. the apparatus according to claim 1, which is characterized in that the flow monitoring device and the temperature measuring equipment with it is described
Adjuster is electrically connected, and the adjuster is electrically connected with the executing agency, and the executing agency is arranged on the heating element
In heater circuit.
3. device according to claim 1 or 2, which is characterized in that the executing agency further includes：Variable resistor, it is described
Variable resistor is arranged in series in the heater circuit of the heating element.
4. device according to claim 1 or 2, which is characterized in that adopted between the heating element and the temperature-controlling system
It is connected with explosion-proof electric wire with anti-explosion terminal box, the anti-explosion terminal box inner wall scribbles are-tight paint.
5. a kind of method for preventing cryogenic heat exchanger frozen plug based on any one of claims 1 to 4 described device, special
Sign is, including：
When the working medium in cryogenic heat exchanger starts solidification, the flow electric signal of flow monitoring device output weakens, temperature measuring equipment
The temperature signal of output weakens, and adjuster only detects that flow electric signal is less than flow signal threshold value and temperature telecommunications at the same time
Number be less than temperature signal threshold value when, control executing agency act so that heating element where heater circuit conducting；
When the bulk temperature of cryogenic heat exchanger rises, and the working medium in cryogenic heat exchanger starts fusing, the flow monitoring device
The flow electric signal enhancing of output, when the adjuster detects that flow electric signal is more than flow signal threshold value, holds described in control
Row mechanism disconnects the heater circuit.
6. according to the method described in claim 5, it is characterized in that, the flow signal threshold value and the temperature signal threshold value root
The critical point that frozen plug occurs according to the working medium of cryogenic heat exchanger under different use environments determines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810088965.9A CN108106484A (en) | 2018-01-30 | 2018-01-30 | A kind of device and method for preventing cryogenic heat exchanger frozen plug |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810088965.9A CN108106484A (en) | 2018-01-30 | 2018-01-30 | A kind of device and method for preventing cryogenic heat exchanger frozen plug |
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| Publication Number | Publication Date |
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| CN108106484A true CN108106484A (en) | 2018-06-01 |
Family
ID=62220892
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|---|---|---|---|
| CN201810088965.9A Pending CN108106484A (en) | 2018-01-30 | 2018-01-30 | A kind of device and method for preventing cryogenic heat exchanger frozen plug |
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| CN (1) | CN108106484A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220546A (en) * | 2019-04-18 | 2019-09-10 | 青岛理工大学 | A kind of tunnel thin shell type heat exchanger clogging detecting system and detection method |
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| CN110220546A (en) * | 2019-04-18 | 2019-09-10 | 青岛理工大学 | A kind of tunnel thin shell type heat exchanger clogging detecting system and detection method |
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