CN111765636A - Intelligent low-temperature fluid electric heating system - Google Patents
Intelligent low-temperature fluid electric heating system Download PDFInfo
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- CN111765636A CN111765636A CN202010562898.7A CN202010562898A CN111765636A CN 111765636 A CN111765636 A CN 111765636A CN 202010562898 A CN202010562898 A CN 202010562898A CN 111765636 A CN111765636 A CN 111765636A
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- electric heating
- heat exchanger
- pipeline
- heating heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/0208—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply
- F24H7/0233—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply the transfer fluid being water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2021—Storage heaters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Temperature (AREA)
Abstract
The invention discloses an intelligent cryogenic fluid electric heating system, which belongs to the technical field of cryogenic fluid heating, and comprises an electric heating heat exchanger and a PLC (programmable logic controller), wherein an inlet pipeline and an outlet pipeline of the electric heating heat exchanger are respectively provided with an automatic regulating valve, a pressure transmitter and a temperature transmitter, a heating assembly is arranged in the electric heating heat exchanger, and a heat exchange medium is filled in the electric heating heat exchanger and is heated by the heating assembly; each automatically regulated valve, pressure transmitter, temperature transmitter and heating element respectively with PLC controller electric connection to reach the purpose that can realize heating system intelligent operation under the condition of unmanned operation.
Description
Technical Field
The invention belongs to the technical field of low-temperature fluid heating, and particularly relates to an intelligent low-temperature fluid electric heating system.
Background
Cryogenic fluids, generally refer to fluids having a boiling point below 120 kelvin (abbreviated K), i.e., about-153 degrees celsius. Cryogenic fluid heating differs from conventional fluid heating by: on one hand, the heating quantity must be strictly controlled, and the quantity of heat provided by the heater and the quantity of heat absorbed by the cryogenic fluid must be accurately calculated; on the other hand, the heating must be uniform, otherwise the risk of vaporization of the cryogenic fluid and the initiation of overpressure of the pressure is likely to occur.
Conventional cryogenic fluid heating equipment is mainly used for gas supply of hydrogen-oxygen fuel cells for vehicles, ships, submersibles and the like, gas supply of vehicle-mounted LNG gas engines, industrial gas devices for low-flow cryogenic fluids, and the like. It mainly has the following problems:
(1) manual manipulation is required to ensure the temperature requirements of the outlet;
(2) the ultra-low temperature medium is easy to freeze after entering the heat exchanger and cannot run under the working condition of the ultra-low temperature medium (-253 ℃ to 90 ℃);
(3) heating equipment needs a plurality of parameters of manpower control in service in order to ensure stable operation, lacks intelligent control.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention provides an intelligent cryogenic fluid electric heating system to achieve the purpose of realizing intelligent operation of the heating system under unmanned operation.
The technical scheme adopted by the invention is as follows: an intelligent low-temperature fluid electric heating system comprises an electric heating heat exchanger and a PLC (programmable logic controller), wherein an inlet pipeline and an outlet pipeline of the electric heating heat exchanger are respectively provided with an automatic regulating valve, a pressure transmitter and a temperature transmitter, a heating assembly is arranged in the electric heating heat exchanger, and a heat exchange medium is filled in the electric heating heat exchanger and is heated by the heating assembly; each automatically regulated valve, pressure transmitter, temperature transmitter and heating element respectively with PLC controller electric connection.
The automatic control system is characterized by further comprising a liquid level meter arranged on the electric heating heat exchanger and a water inlet pipeline communicated with the inside of the electric heater, wherein an automatic regulating valve is arranged on the water inlet pipeline, the automatic regulating valve and the liquid level meter are respectively electrically connected with the PLC, so that the liquid level of a heat exchange medium in the electric heating heat exchanger is monitored in real time through the liquid level meter, and the heat exchange medium in the electric heating heat exchanger is supplemented in real time.
Furthermore, the liquid level meter adopts a tuning fork liquid level meter, and the tuning fork liquid level meter can realize the heat exchange medium liquid level detection of the equipment under the working conditions of vehicle, ship and vibration (the equipment is inclined and deviated at 0-25 degrees left and right).
Furthermore, the exhaust port pipeline is arranged on the electric heating heat exchanger, and is arranged at the top of the electric heating heat exchanger, and an automatic exhaust valve is arranged on the exhaust port pipeline. After the heat exchange medium in the equipment is gasified and the pressure exceeds the pressure setting range, the automatic exhaust valve can automatically exhaust gas and does not exhaust heat exchange medium solution, so that the pressure can be reduced, and the heat exchange medium can be prevented from being exhausted from the equipment due to ultrahigh pressure, so that the heat exchange medium is required to be continuously added in a short time.
Furthermore, the water outlet pipeline is arranged on the electric heating heat exchanger, the water outlet pipeline is arranged at the bottom of the electric heating heat exchanger, an automatic regulating valve is arranged on the water outlet pipeline, and the automatic regulating valve is electrically connected with the PLC so as to meet the real-time replacement requirement of heat exchange media in the electric heating heat exchanger.
Furthermore, the heat exchange medium adopts an ethylene glycol solution, the ethylene glycol solution has the characteristics of low freezing point and no pollution, and the freezing point value of the ethylene glycol solution can be adjusted by any mixing ratio of the ethylene glycol and water, so that different low-temperature media can be matched.
Further, the heating assembly comprises a plurality of groups of mutually independent heating rods, each group of heating rods is respectively connected with a relay for controlling the on-off of the circuit of the heating assembly, each relay is respectively electrically connected with the PLC, and the PLC can respectively control each heating rod through each relay due to the mutual independence of each group of heating rods, so that the operation of controlling the heating quantity can be realized, and the requirement for the outlet temperature in an outlet pipeline can be further met.
The invention has the beneficial effects that:
1. the intelligent electric heating system for the low-temperature fluid mainly comprises an automatic regulating valve, a temperature transmitter and a pressure transmitter, can realize intelligent unmanned operation when heating the low-temperature fluid under the mutual cooperation of all the components, and can ensure that the equipment runs stably and can meet the requirement of outlet temperature in the heating process.
2. By adopting the intelligent low-temperature fluid electric heating system provided by the invention, according to the characteristics of the low-temperature medium, the PLC controller can preheat the heat exchange medium through the heating assembly in advance, so that the ultra-low-temperature medium is prevented from being frozen after entering the heating heat exchanger, and the working condition operation of the ultra-low-temperature medium at the temperature of minus 253 ℃ to 90 ℃ is realized.
Drawings
Figure 1 is a schematic diagram of the overall structure of an intelligent cryogenic fluid electric heating system provided by the present invention;
FIG. 2 is a piping connection diagram of the intelligent cryogenic fluid electric heating system provided by the present invention
The drawings are labeled as follows:
m-automatic regulating valve, LII-liquid level meter, S-automatic exhaust valve, PT-pressure transmitter, TT-temperature transmitter, W-heating component, 1-inlet, 2-outlet, 3-water inlet, 4-exhaust port, 5-water outlet, 6-full measuring port, 7-PLC control cabinet, 8-fixed frame and 9-electric heating heat exchanger.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As shown in fig. 1 and fig. 2, in this embodiment, an intelligent cryogenic fluid electric heating system is specifically provided, which includes a fixed frame, an electric heating heat exchanger and a PLC control cabinet mounted on the fixed frame, and a PLC controller is further included in the PLC control cabinet, an inlet pipeline is connected to one end of the electric heating heat exchanger, and an automatic regulating valve, a pressure transmitter and a temperature transmitter are sequentially arranged on the inlet pipeline along the flow direction of a cryogenic medium; the other end of the electric heating heat exchanger is connected with an outlet pipeline, an automatic regulating valve, a pressure transmitter and a temperature transmitter are sequentially arranged on the outlet pipeline along the flow direction of low-temperature media, a heat exchange pipeline is arranged in the electric heating heat exchanger and communicates the inlet pipeline with the outlet pipeline through the heat exchange pipeline, the low-temperature media flow through the heat exchange pipeline when entering from the inlet pipeline, and are heated under the action of the heat exchange pipeline and the heat exchange media in the electric heating heat exchanger, so that the low-temperature media meeting the temperature requirement flow out from the outlet pipeline.
A heating assembly is arranged in the electric heating heat exchanger, and a heat exchange medium is filled in the electric heating heat exchanger and is heated by the heating assembly; still be equipped with temperature transmitter on the electrical heating heat exchanger to through the heating temperature condition of heat transfer medium in this temperature transmitter real-time detection electrical heating heat exchanger, this temperature transmitter is connected with the PLC controller electricity, with the temperature information real-time feedback to the PLC controller with heat transfer medium, the temperature data of heat transfer medium in the electrical heating heat exchanger is received in real time to the PLC controller, if the temperature is too high or low excessively, then adjust heating element's heating capacity through the PLC controller, in order to guarantee the safe operation of equipment.
Each automatically regulated valve, pressure transmitter, temperature transmitter and heating element respectively with PLC controller electric connection, in this embodiment, the model of PLC controller is siemens s7-200smart, under the effect of PLC controller, realizes the collaborative work between each part. The working principle is as follows:
before the low-temperature fluid medium enters the electric heating heat exchanger, the PLC controls the heating component to work according to the low-temperature characteristic of the low-temperature fluid medium so as to heat the heat exchange medium in the electric heating heat exchanger in advance, the low-temperature fluid medium is detected in real time by a temperature transmitter arranged on the electric heating heat exchanger, when the heat exchange medium reaches a preset temperature, then the PLC controls an automatic regulating valve on an inlet pipeline to be opened, the low-temperature fluid medium enters the electric heating heat exchanger, meanwhile, in the running process, the pressure and the temperature of the low-temperature fluid medium in the inlet pipeline are detected by the temperature transmitter and the pressure transmitter on the inlet pipeline, the detected data are fed back to the PLC in real time, and the PLC adjusts an automatic regulating valve on the inlet pipeline according to the detected data so as to regulate and; the specific regulation and control method comprises the following steps: when the pressure transmitter detects that the inlet pressure is smaller than the set pressure, the opening of a valve on the inlet pipeline is adjusted to be large, the rear-end pressure requirement is met by increasing the flow, otherwise, the opening is adjusted to be small; when the temperature transmitter detects that the inlet temperature is too low, the opening of the valve on the inlet pipeline is adjusted to be small, the rear work safety is ensured, and otherwise, the opening is adjusted to be large.
Similarly, a temperature transmitter and a pressure transmitter are arranged on the outlet pipeline to detect the temperature and the pressure of the low-temperature fluid medium after heat exchange in real time, and the PLC can adjust the heating amount of the heating assembly according to the detection data fed back by the temperature transmitter and the pressure transmitter through the temperature data so as to ensure the outlet temperature requirement (for example, if the outlet temperature is not enough, the heating amount of the heating assembly is increased, otherwise, the heating amount of the heating assembly is reduced); through pressure data, the opening size of automatically regulated valve on this outlet pipeline of PLC controller adjustable to flow to outlet pipeline regulates and control, and then adjusts the low temperature fluid medium pressure in the heat exchange pipeline, for example: when pressure transmitter detection pressure on the outlet pipeline is low excessively, the opening of the regulating valve on the outlet pipeline is increased, the flow is increased to adjust the pressure, the pressure requirement can not be met at the maximum opening, the opening of the regulating valve on the inlet pipeline is increased, the inlet flow is increased, the pressure requirement is further met, and on the contrary, the pressure transmitter detection pressure on the outlet pipeline is no longer described repeatedly herein.
In order to ensure the safe operation of the whole equipment system, the system further comprises a liquid level meter arranged on the electric heating heat exchanger and a water inlet pipeline communicated with the inside of the electric heater, wherein an automatic regulating valve is arranged on the water inlet pipeline, the automatic regulating valve and the liquid level meter are respectively electrically connected with the PLC controller so as to monitor the liquid level of the heat exchange medium inside the electric heating heat exchanger in real time through the liquid level meter, and when the liquid level inside the electric heating heat exchanger is detected to be too low, the liquid level inside the electric heating heat exchanger is controlled to supplement the heat exchange medium inside the electric heating heat exchanger in real. In practical application, the liquid level meter adopts a tuning fork liquid level meter, and the tuning fork liquid level meter can realize the heat exchange medium liquid level detection of the equipment under the working conditions of vehicle, ship and vibration (the equipment is inclined and deviated at 0-25 degrees left and right).
The automatic adjusting valve is electrically connected with the PLC, and when a heat exchange medium in the electric heating heat exchanger needs to be replaced, the real-time replacement requirement of the heat exchange medium in the electric heating heat exchanger is met; or when the liquid level device detects that the liquid level inside the electric heating heat exchanger is too high, the PLC controller can regulate and control the automatic regulating valve on the water outlet pipeline so as to discharge the heat exchange medium inside the electric heating heat exchanger and meet the requirement of the liquid level inside the electric heating heat exchanger.
In order to further ensure the safe operation of the whole equipment, the device further comprises an exhaust port pipeline arranged on the electric heating heat exchanger, wherein the exhaust port pipeline is arranged at the top of the electric heating heat exchanger, and an automatic exhaust valve is arranged on the exhaust port pipeline. After the heat exchange medium in the equipment is gasified, because the automatic exhaust valve presets a pressure threshold value, when the pressure exceeds the pressure setting range, the exhaust port pipeline is not directly contacted with the heat exchange medium in the electric heating heat exchanger, the automatic exhaust valve can automatically exhaust gas and does not exhaust heat exchange medium solution, thereby not only realizing pressure reduction, but also ensuring that the heat exchange medium cannot be exhausted out of the equipment due to ultrahigh pressure, and leading the heat exchange medium to be continuously added in a short time.
In order to further enhance the application range of the heating system, the heat exchange medium adopts a glycol solution, the glycol solution has the characteristics of low freezing point and no pollution, and the glycol and water can be mixed in any proportion to adjust the freezing point value of the glycol solution so as to match different low-temperature media.
Example 2
On the basis of the intelligent cryogenic fluid electric heating system disclosed in embodiment 1, in order to further realize that the heating amount can be properly controlled during heating, the heating assembly comprises a plurality of groups of mutually independent heating rods, each group of heating rods penetrates through the electric heating heat exchanger to heat a heat exchange medium filled in the electric heating heat exchanger, each group of heating rods is respectively connected with a relay for controlling the circuit on-off of the heating rods, the control end of each relay is respectively electrically connected with the PLC controller to control the action of each relay through the PLC controller, and then each group of heating rods is connected into a power supply circuit corresponding to the relay, because each group of heating rods are mutually independent, the PLC controller can respectively control each heating rod through each relay to adjust the number of the heating rods connected into the circuit and operated, so that the size control operation of the heating amount can be realized, thereby meeting the requirement of outlet temperature in the outlet pipeline.
In the practical application process, because the electric heating heat exchanger is mostly circular form, can evenly arrange each group's heating rod around electric heating heat exchanger's circumferential direction to can carry out the equilibrium heating to the heat transfer medium of electric heating heat exchanger inside.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (7)
1. An intelligent low-temperature fluid electric heating system comprises an electric heating heat exchanger and is characterized by also comprising a PLC (programmable logic controller), wherein an inlet pipeline and an outlet pipeline of the electric heating heat exchanger are respectively provided with an automatic regulating valve, a pressure transmitter and a temperature transmitter, a heating assembly is arranged in the electric heating heat exchanger, and a heat exchange medium is filled in the electric heating heat exchanger and is heated by the heating assembly; each automatically regulated valve, pressure transmitter, temperature transmitter and heating element respectively with PLC controller electric connection.
2. The intelligent cryogenic fluid electric heating system of claim 1, further comprising a liquid level meter arranged on the electric heating heat exchanger and a water inlet pipeline communicated with the inside of the electric heater, wherein an automatic regulating valve is arranged on the water inlet pipeline, and the automatic regulating valve and the liquid level meter are respectively and electrically connected with the PLC.
3. The intelligent cryogenic fluid electric heating system of claim 1 wherein the level gauge is a tuning fork level gauge.
4. The intelligent cryogenic fluid electric heating system of claim 1, further comprising an exhaust port pipeline arranged on the electric heating heat exchanger, wherein the exhaust port pipeline is arranged on the top of the electric heating heat exchanger, and an automatic exhaust valve is arranged on the exhaust port pipeline. .
5. The intelligent cryogenic fluid electric heating system of claim 1, further comprising a water outlet pipeline arranged on the electric heating heat exchanger, wherein the water outlet pipeline is arranged at the bottom of the electric heating heat exchanger, and an automatic regulating valve is arranged on the water outlet pipeline and is electrically connected with the PLC.
6. The intelligent cryogenic fluid electric heating system of claim 1 wherein the heat exchange medium is a glycol solution.
7. The intelligent cryogenic fluid electric heating system of claim 1, wherein the heating assembly comprises a plurality of groups of mutually independent heating rods, each group of heating rods is respectively connected with a relay for controlling the on-off of the circuit of the heating rods, and each relay is respectively and electrically connected with the PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562898.7A CN111765636A (en) | 2020-06-19 | 2020-06-19 | Intelligent low-temperature fluid electric heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562898.7A CN111765636A (en) | 2020-06-19 | 2020-06-19 | Intelligent low-temperature fluid electric heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111765636A true CN111765636A (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010562898.7A Pending CN111765636A (en) | 2020-06-19 | 2020-06-19 | Intelligent low-temperature fluid electric heating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111765636A (en) |
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2020
- 2020-06-19 CN CN202010562898.7A patent/CN111765636A/en active Pending
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