CN112781430B - Method for controlling heat exchanger, storage medium and electronic device - Google Patents
Method for controlling heat exchanger, storage medium and electronic device Download PDFInfo
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- CN112781430B CN112781430B CN202011633360.7A CN202011633360A CN112781430B CN 112781430 B CN112781430 B CN 112781430B CN 202011633360 A CN202011633360 A CN 202011633360A CN 112781430 B CN112781430 B CN 112781430B
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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
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Abstract
The embodiment of the application discloses a method for controlling a heat exchanger, a storage medium and an electronic device. The method comprises the following steps: before the heat exchange operation is carried out on the raw material, the outlet flow V of the heat medium of the heat exchanger is adjusted OH Is adjusted to the required flow rate V H Wherein the required flow rate V H The raw material can reach the set temperature T at the raw material outlet of the heat exchanger OO (ii) a After finishing the outlet flow V of the heat medium of the heat exchanger OH After the adjustment, a heat exchange operation is performed on the feedstock.
Description
Technical Field
The embodiment of the application relates to the field of petrochemical industry, in particular to a method for controlling a heat exchanger, a storage medium and an electronic device.
Background
The heat exchanger is an indispensable processing unit in the petrochemical field processing flow. The heat exchanger can utilize the energy exchange of cold and hot media to ensure that the treated raw material reaches a proper treatment temperature.
Fig. 1 is a schematic diagram of a heat exchanger control flow in the related art. As shown in fig. 1, the raw material enters the tube side of the heat exchanger and exchanges heat with the heat medium of the shell side to meet the temperature requirement of the heat exchanger outlet medium. The flow of the heat medium is controlled by the temperature of the refrigerant outlet of the heat exchanger; that is, when the temperature of the product outlet is detected to be low, the opening degree of the heat medium side valve is increased, and the delivery quantity of the heat medium is increased, so that the temperature of the product is increased; when the product temperature is detected to be high, the opening degree of the heat medium side valve is reduced, the output of the heat medium is reduced, and the product temperature is reduced.
In practical application, the control of the opening degree of the heat medium side valve can cause the temperature fluctuation of the outlet of the heat exchanger, so that the product temperature after heat exchange cannot meet the index requirement.
Disclosure of Invention
In order to solve any one of the above technical problems, embodiments of the present application provide a method of controlling a heat exchanger, a storage medium, and an electronic device.
To achieve the purpose of the embodiments of the present application, the embodiments of the present application provide a method for controlling a heat exchanger, including:
before the heat exchange operation is carried out on the raw material, the outlet flow V of the heat medium of the heat exchanger is adjusted OH Is adjusted to the required flow V H Wherein the required flow rate V H The raw material can reach the set temperature T at the raw material outlet of the heat exchanger OO ；
After finishing the outlet flow V of the heat medium of the heat exchanger OH After the adjustment, a heat exchange operation is performed on the feedstock.
A storage medium having a computer program stored therein, wherein the computer program is arranged to perform the method as described above when executed.
An electronic device comprising a memory having a computer program stored therein and a processor arranged to execute the computer program to perform the method as described above.
One of the above technical solutions has the following advantages or beneficial effects:
before the heat exchange operation is carried out on the raw material, the outlet flow V of the heat medium of the heat exchanger is adjusted OH Is adjusted to the required flow rate V H After finishing the outlet flow V of the heat medium of the heat exchanger OH After the adjustment, the heat exchange operation is carried out on the raw material, and the pre-warning control mechanism is adopted to finish the outlet flow V in advance OH The purpose of controlling the outlet temperature of the raw material is achieved, and the problem that the outlet temperature is unstable when the flow of the heat medium is adjusted based on the change of the outlet temperature is solved.
Additional features and advantages of the embodiments of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application. The objectives and other advantages of the embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the examples of the embodiments of the present application do not constitute a limitation of the embodiments of the present application.
FIG. 1 is a schematic diagram of a heat exchanger control flow in the related art;
FIG. 2 is a flow chart of a method for controlling a heat exchanger according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a heat exchanger control flow provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, in the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.
In the process of implementing the application, technical analysis is performed on the related technologies, and it is found that the related technologies have at least the following problems, including:
in the related technology, the outlet temperature of a product is taken as an adjusting target value, the method belongs to feedback control, the flow of a heat medium is changed by changing the opening of an adjusting valve, the change of the outlet temperature is observed, and then the flow of the heat medium is adjusted, and if the PID setting parameter is not properly set or the product is sensitive to the temperature, the actual outlet temperature is unstable.
The method is suitable for the product treatment process which is not sensitive to the influence of the temperature, but the product index is not easy to ensure for the crude oil which is sensitive to the influence of the temperature or the oil field with the frequently changed crude oil yield. Fig. 2 is a flowchart of a method for controlling a heat exchanger according to an embodiment of the present disclosure. As shown in fig. 2, the method includes:
In an exemplary embodiment, the feedstock can be a petroleum or crude oil chemical feedstock.
Different from the adjustment based on the outlet temperature of the raw material in the related art, the outlet flow V of the heat medium is completed before the raw material enters the raw material inlet of the heat exchanger OH And (4) adjusting.
According to the method provided by the embodiment of the application, before the heat exchange operation is performed on the raw material, the outlet flow V of the heat medium of the heat exchanger is determined OH Is adjusted to the required flow rate V H After finishing the outlet flow V of the heat medium of the heat exchanger OH After the adjustment, the heat exchange operation is carried out on the raw material, and the pre-warning control mechanism is adopted to finish the outlet flow V in advance OH The purpose of controlling the outlet temperature of the crude oil is achieved, and the problem that the outlet temperature is unstable when the flow of the heat medium is adjusted based on the change of the outlet temperature is solved.
The method provided by the embodiments of the present application is explained as follows:
in an exemplary embodiment, the demand flow V H Is obtained by the following steps:
obtaining a raw material flow V of the heat exchanger IO To a temperature T from the inlet IO Reaches a set temperature T OO Desired target heat quantity Q O And a unit heat quantity Q which can be provided by the unit outlet flow quantity of the heat medium of the heat exchanger H ；
According to the target heat quantity Q O And said specific heat quantity Q H Determining the flow of the heat medium required by the flow of the raw material inlet reaching the set temperature, and adjusting the flow to the required flow V H 。
By obtaining the target heat quantity Q required by the raw material to reach the set temperature O And the unit heat quantity Q that the unit heat medium can provide H Accurately determining the flow size of the heat medium required by the raw material inlet flow to reach the set temperature based on the heat relation, and adjusting the flow size to the required flow V H And the accuracy of calculation is improved.
In one exemplary embodiment, the heat transfer medium is sized to the required flow rate V H Obtained by the following steps:
calculating the target heat quantity Q O And unit heat quantity Q H The ratio therebetween;
according to the calculated ratio, determining that the flow of the heat medium required by the raw material inlet flow reaching the set temperature is adjusted to the required flow V H 。
By calculating said target heat quantity Q O And unit heat quantity Q H The ratio therebetween can be obtained as the required flow rate V H The theoretical value of (1) can be directly set as an actual value; or, in consideration of an actual application scenario, setting a corresponding flow rate adjustment coefficient, and obtaining an actual value through the flow rate adjustment coefficient and a theoretical value, wherein the flow rate adjustment coefficient is determined according to information such as heat loss.
In an exemplary embodiment, the target heat quantity Q O Obtained by the following steps:
calculating the inlet temperature T of the feedstock IO And the set temperature T OO The temperature difference of the raw material of (2);
according to the specific heat capacity C of the raw material O Inlet flow rate V IO And the temperature difference of the raw material, calculating the target heat quantity Q of the raw material O 。
The specific heat capacity C of the raw material O Inlet flow V IO Multiplying the three parameters of the temperature difference of the raw materials by the value to obtain the target heat Q O The theoretical value of (1) can be directly set as an actual value; or, in consideration of an actual application scenario, setting a corresponding raw material heat adjustment coefficient, and obtaining an actual value through the raw material heat adjustment coefficient and a theoretical value, wherein the raw material heat adjustment coefficient is determined according to information such as heat loss.
In one exemplary embodiment, the specific heat quantity Q H Obtained by the following steps:
calculating the inlet temperature T of the heat medium IH And the outlet temperature T of the heat medium OH The temperature difference of the heat medium;
according to the specific heat capacity C of the heat medium O And calculating the unit heat quantity Q of the heat medium according to the temperature difference of the heat medium H 。
The specific heat capacity C of the heat medium O Multiplying the value of the temperature difference of the heat medium by the value of the temperature difference of the heat medium to obtain the unit heat quantity Q H The theoretical value of (1) can be directly set as an actual value; or, in consideration of an actual application scenario, setting a corresponding unit heat adjustment coefficient, and obtaining an actual value through the unit heat adjustment coefficient and a theoretical value, wherein the unit heat adjustment coefficient is determined according to information such as heat loss.
In one exemplary embodiment, the method further comprises:
at the time of calculating the required flow rate V H Before, the following parameters of the heat exchanger are collected, including at least one of:
inlet temperature T of the feedstock IO The outlet temperature T of the raw material OO Flow rate of raw material V IO The inlet temperature T of the heat medium IH The outlet temperature T of the heat medium OH And the outlet flow rate V of the heat medium OH 。
The collection period may be periodic or initiated when a change in the material is detected or a change in the value of one of the parameters is detected.
In one exemplary embodiment, the method further comprises:
after the heat exchange operation is started on the raw material, if the acquired parameters of the heat exchanger change, the required flow V is recalculated H 。
When the parameters of the heat exchanger change, the required heat V is added H And the recalculation is carried out, so that the processing accuracy of the heat exchange operation can be ensured.
In one exemplary embodiment, the heat exchangerOutlet flow V of heat medium OH Is adjusted to the required flow V H The method comprises the following steps:
comparing the required flow V of the heat medium H And the outlet flow V of the heat medium of the heat exchanger OH Determining the adjusting direction of a valve of a heat medium outlet of the heat exchanger;
if the required flow rate V of the heat medium H Greater than outlet flow V of heat medium OH Then the large valve is opened until the outlet flow V of the heat medium OH Equal to the required flow V of the heat medium H ；
If the flow rate V of the heat medium is large H Is less than the outlet flow V of the heat medium OH Then the valve is adjusted to be small until the outlet flow V of the heat medium OH Equal to the required flow V of the heat medium H 。
Based on the operation, the accurate control of the valve of the heat medium of the heat exchanger can be completed, and the support is provided for the subsequent control of the outlet temperature of the raw material.
The scheme provided by the embodiment of the application is not limited to the form of the heat exchanger, and a shell-and-tube heat exchanger is taken as an example for explanation.
Fig. 3 is a schematic diagram of a heat exchanger control flow provided in an embodiment of the present application. As shown in fig. 3, the control method of the method includes:
the signal to be detected: temperature signal T of crude oil inlet of heat exchanger IO Flow signal V of crude oil inlet of heat exchanger IO Temperature signal T of crude oil outlet of heat exchanger OO Temperature signal T of heat medium inlet of heat exchanger IH Temperature signal T of heat medium outlet of heat exchanger OH Temperature signal T of heat medium outlet of heat exchanger OH Flow signal V of heat medium outlet of heat exchanger OH 。
Step 01, before the heat exchange operation is carried out on the raw materials, obtaining target heat required when the inlet flow of the raw materials reaches a set temperature;
calculating the heat required by the crude oil: transferring the temperature of the crude oil inlet, the flow rate of the crude oil inlet and the temperature of the crude oil outlet of the heat exchanger to a crude oil heat collectorAnd the module is used for calculating the heat required by the crude oil to reach the preset set temperature. Q O ＝C O *V IO (T OO -T IO )
02, determining unit heat quantity which can be provided by unit flow of a heat medium outlet of the heat exchanger;
step 03, determining the required flow of the heating medium required by the raw material inlet flow to reach the set temperature according to the target heat and the unit heat;
step 04, adjusting the current flow of a heat medium outlet of the heat exchanger according to the target required flow;
and step 05, after the adjustment is finished, performing heat exchange operation on the raw materials.
Calculating the heat provided by the unit volume of the heat medium: and the temperature of a heat medium inlet and the temperature of a heat medium outlet of the heat exchanger are transmitted to a heat medium heat integration module, and the heat which can be provided by the unit flow of the heat medium is calculated. Q H ＝C H *(T IH -T OH )
Calculating the flow rate of the heat medium demand: and transmitting the calculation data of the crude oil heat integration module and the heat medium heat integration module to the heat medium flow integration module to calculate the flow required by the heat medium. V H ＝Q O /Q H
The opening of the valve is adjusted. And adjusting the opening degree of a valve of a heat medium outlet of the heat exchanger by comparing the required flow of the heat medium with the flow of the heat medium outlet of the heat exchanger. If V H Greater than V OH If it is necessary to open the large valve, otherwise, the valve is adjusted to be small until V H Is equal to V OH 。
The method provided by the embodiment of the application adopts the preposed early warning control to measure the parameters of the crude oil and the heat medium for heat exchange in advance, so that the purpose of controlling the outlet temperature of the crude oil is achieved, and the condition that the outlet temperature of the crude oil is unqualified is avoided.
An embodiment of the present application provides a storage medium, in which a computer program is stored, wherein the computer program is configured to perform the method described in any one of the above when the computer program is executed.
An electronic device according to an embodiment of the present application includes a memory having a computer program stored therein and a processor configured to execute the computer program to perform the method described in any of the above.
For the industrial field, it is usually implemented by PLC (Programmable Logic Controller, chinese is called Programmable Logic Controller), RTU (remote terminal unit), or DCS (Distributed Control System).
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (9)
1. A method of controlling a heat exchanger, comprising:
before the heat exchange operation is carried out on the raw material, the outlet flow V of the heat medium of the heat exchanger is adjusted OH Is adjusted to the required flow rate V H Wherein the required flow rate V H The raw material can reach the set temperature T at the raw material outlet of the heat exchanger OO ；
After finishing the outlet flow V of the heat medium of the heat exchanger OH After the adjustment, performing heat exchange operation on the raw material;
wherein the required flow V H Is obtained by the following steps:
obtaining the raw material flow V of the heat exchanger IO To a temperature T from the inlet IO Reaches a set temperature T OO Desired target heat quantity Q O And a unit heat quantity Q which can be provided by the unit outlet flow quantity of the heat medium of the heat exchanger H ；
According to the target heat quantity Q O And said specific heat quantity Q H Determining the size of the heat medium required by the flow of the raw material inlet reaching the set temperature and adjusting the size to the required flow V H 。
2. Method for controlling a heat exchanger according to claim 1, characterised in that the flow of the heat transfer medium is dimensioned to the required flow V H Obtained by the following steps:
calculating the target heat quantity Q O And unit heat quantity Q H The ratio therebetween;
according to the calculated ratio, determining that the flow of the heat medium required by the raw material inlet flow reaching the set temperature is adjusted to the required flow V H 。
3. The method of controlling a heat exchanger of claim 1, wherein the target heat quantityQ O Obtained by the following steps:
calculating the inlet temperature T of the feedstock IO And the set temperature T OO The temperature difference of the raw material of (2);
according to the specific heat capacity C of the raw materials O Inlet flow rate V IO And the temperature difference of the raw material, calculating the target heat quantity Q of the raw material O 。
4. Method for controlling a heat exchanger according to claim 1, characterised in that said specific heat quantity Q H Obtained by the following steps:
calculating the inlet temperature T of the heat medium IH And the outlet temperature T of the heat medium OH The temperature difference of the heat medium;
according to the specific heat capacity C of the heat medium O And calculating the unit heat quantity Q of the heat medium according to the temperature difference of the heat medium H 。
5. The method of controlling a heat exchanger according to claim 3 or 4, further comprising:
at the time of calculating the required flow rate V H Before, the following parameters on the heat exchanger are collected, including at least one of:
inlet temperature T of the feedstock IO The outlet temperature T of the raw material OO Flow rate V of raw material IO The inlet temperature T of the heat medium IH Outlet temperature T of the heat medium OH And the outlet flow rate V of the heat medium OH 。
6. The method of controlling a heat exchanger of claim 5, further comprising:
after the heat exchange operation is started to be performed on the raw material, if the acquired parameters of the heat exchanger change, the required flow V is recalculated H 。
7. According to the claimThe method of controlling a heat exchanger according to claim 1, wherein the outlet flow rate V of the heat medium of the heat exchanger is set OH To the required flow rate V H The method comprises the following steps:
comparing the required flow V of the heat medium H And the outlet flow V of the heat medium of the heat exchanger OH Determining the adjusting direction of a valve of a heat medium outlet of the heat exchanger;
if the required flow rate V of the heat medium H Greater than outlet flow V of heat medium OH Then the large valve is opened until the outlet flow V of the heat medium OH Equal to the required flow V of the heat medium H ；
If the required flow rate V of the heat medium is H Less than outlet flow V of heat medium OH Then the valve is adjusted to be small until the outlet flow V of the heat medium OH Equal to the required flow V of the heat medium H 。
8. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 7 when executed.
9. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 7.
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