Intelligent temperature control heat exchange device for oilfield station

Abstract

This invention provides an intelligent temperature-controlled heat exchange device for oilfield stations, relating to the field of oilfield processing technology. It includes a heat exchanger and a heat controller. A linear regulating valve, a first flow meter, and a first temperature transmitter are installed on the inlet pipe of the heat exchanger's hot medium, and a second temperature transmitter is installed on the outlet pipe. A second flow meter and a third temperature transmitter are installed on the inlet pipe of the heat exchanger's cold medium, and a fourth temperature transmitter is installed on the outlet pipe. All measuring instruments and the linear regulating valve are connected to the heat controller. The heat controller calculates the heat value of the cold medium in the heat exchanger based on the real-time values ​​from each measuring instrument. If the heat value changes relative to the preset cold medium heat value, it calculates the currently required heat value of the hot medium, calculates the corresponding heat medium flow rate, adjusts the linear regulating valve, and controls the flow rate at the heat medium inlet to achieve temperature control of the heat exchanger. This invention solves the problem of difficult temperature control in oilfield station heat exchangers when operating conditions change.

Description

Technical Field

[0001] This invention relates to the field of oilfield processing technology, and in particular to an intelligent temperature control heat exchange device for oilfield stations. Background Technology

[0002] Typically, after crude oil enters the oilfield station through gathering and transportation pipelines, it first undergoes primary gas-liquid separation, followed by heating for dehydration. During the heating and dehydration stage, the main equipment used at the oilfield station to heat the crude oil is a heat exchanger. A heat exchanger is a device that uses hot water or steam to exchange heat with the crude oil, using hot water or steam as the heat transfer medium. Oilfield stations generally use hot water for heat exchange. Currently, most stations use manual shut-off valves for their heat exchangers. The heat exchange effect is observed by monitoring the temperatures at the inlet and outlet of the hot and cold media. If the outlet temperature of the cold media decreases, the shut-off valve opening is increased to increase the flow rate of the hot media and raise the outlet temperature. Conversely, if the outlet temperature of the cold media is too high, the shut-off valve opening is decreased to reduce the flow rate of the hot media and lower the outlet temperature.

[0003] Current heat exchange systems have the following problems:

[0004] 1. If the heat exchanger uses manual valves, it requires purely manual operation. Since the amount of crude oil entering the oilfield station fluctuates in real time, the labor intensity of personnel is high.

[0005] 2. Although electric valves have been added to the inlet and outlet of heat exchangers in some oilfield stations, the opening degree of the electric valves needs to be controlled by the central control room, and the central control room still needs to be monitored by people in real time.

[0006] 3. Even if electric valves are added to the inlet and outlet pipelines of the heat exchanger, the opening degree of the electric valves is controlled manually. When the temperature of the refrigerant medium decreases or increases and the water flow needs to be adjusted, it cannot be quantitatively adjusted and multiple adjustments are required to reach the required temperature.

[0007] 4. In order to reduce the labor intensity of workers and improve the digitalization of the stations, some oilfield stations have interlocked the inlet and outlet electric valves of heat exchangers with the temperature changes at the inlet and outlet. The hope is that automatic interlocking can achieve automatic adjustment of the flow rate of the heat medium. When the outlet temperature of the cold medium rises / falls, the electric valve will actuate to reduce / increase the flow rate of the heat medium. However, because heat exchange in heat exchangers has a delay, the outlet temperature of the cold medium in the heat exchanger will only be displayed after the electric valve has been actuated for a period of time. By then, the opening of the electric valve has already been too large, causing the outlet temperature of the cold medium in the heat exchanger to be higher than the target temperature. According to the interlock requirements, the electric valve will start to actuate again to reduce the flow rate of the heat medium. Due to the delay in the heat exchange effect, by the time the outlet temperature of the cold medium is displayed, the opening of the electric valve has already been too small. This cycle repeats, causing the electric valve to be constantly actuated, increasing the probability of electric valve failure and shortening the service life of the electric valve. Summary of the Invention

[0008] In view of this, the present invention provides an intelligent temperature control heat exchange device for oilfield stations. By configuring flow meters, regulating valves, temperature transmitters and other detection instruments and interlocking them, it is used to solve the problems of current crude oil heat exchangers, such as difficulty in controlling temperature rise when operating conditions change, high labor intensity for personnel, and easy damage to flow regulating electric valves.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] An intelligent temperature control heat exchange device for oilfield stations includes: a heat exchanger and a heat controller;

[0011] A linear regulating valve, a first flow meter, and a first temperature transmitter are sequentially installed on the heat medium inlet pipe of the heat exchanger along the flow direction of the heat medium, and a second temperature transmitter is installed on the heat medium outlet pipe.

[0012] A second flow meter and a third temperature transmitter are installed sequentially on the inlet pipe of the heat exchanger along the flow direction of the cold medium, and a fourth temperature transmitter is installed on the outlet pipe of the cold medium.

[0013] The linear regulating valve, the first flow meter, the second flow meter, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, and the fourth temperature transmitter are all connected to the heat controller.

[0014] The heat controller calculates the heat value of the cold medium in the heat exchanger based on the real-time values ​​of the second flow meter, the third temperature transmitter, and the fourth temperature transmitter. If the heat value of the cold medium changes relative to the preset heat value of the cold medium, it calculates the current required heat value of the heat medium. Based on the heat value of the heat medium and the real-time values ​​of the first and second temperature transmitters, it calculates the flow rate of the heat medium. Based on the difference between the flow rate of the heat medium and the real-time value of the first flow meter, it adjusts the linear regulating valve to control the flow rate of the heat medium inlet, thereby achieving temperature control of the heat exchanger.

[0015] As a further improvement of the present invention, the heat controller is equipped with heat advance calculation software;

[0016] The heat controller obtains the inlet and outlet temperatures of the cold medium from the third and fourth temperature transmitters, respectively, and obtains the flow rate of the cold medium from the second flow meter.

[0017] The heat advance calculation software calculates the heat value of the cold medium in the heat exchanger based on the inlet and outlet temperatures of the cold medium and the flow rate of the cold medium.

[0018] As a further improvement of the present invention, the formula for calculating the heat value of the cold medium in the heat exchanger is as follows:

[0019] q (冷媒介质) =c (冷媒介质) m (冷媒介质) (T B -T A );

[0020] in,

[0021] c (冷媒介质) This indicates the specific heat capacity of the cooling medium.

[0022] m (冷媒介质) This indicates the current flow rate of the cooling medium;

[0023] T A T B These represent the current inlet and outlet temperatures of the refrigerant, respectively.

[0024] As a further improvement of the present invention, the preset heat value of the cooling medium includes:

[0025] The inlet temperature T3 and outlet temperature T4 of the heat exchanger's refrigerant are preset, and the refrigerant flow rate M is set. (冷媒介质) The formula for calculating the heat required for the cooling medium is:

[0026] Q (冷媒介质) =c (冷媒介质) M (冷媒介质) (T4-T3)

[0027] in,

[0028] c (冷媒介质) This indicates the specific heat capacity of the cooling medium.

[0029] Q (冷媒介质) As a preset heat value for the cold medium.

[0030] As a further improvement of the present invention, the calculation of the required heat value of the heat transfer medium includes:

[0031] According to the heat balance formula: q (热媒介质) η (换热效率) =q (冷媒介质)

[0032] in,

[0033] q (冷媒介质) This indicates the current heat value of the cooling medium in the heat exchanger;

[0034] q (热媒介质) This indicates the current required heat value of the heat transfer medium;

[0035] η (换热效率) This indicates the heat exchange efficiency of the heat exchanger.

[0036] As a further improvement of the present invention, the flow rate of the heat medium is calculated based on the calorific value of the heat medium and the real-time values ​​of the first temperature transmitter and the second temperature transmitter; including:

[0037] The flow rate of the heat medium is calculated using the formula for calculating the calorific value of the heat medium. The formula is as follows:

[0038] m (热媒介质) =q (热媒介质) / (c (热媒介质) (T1-T2)

[0039] in,

[0040] q (热媒介质) This indicates the current required heat value of the heat transfer medium;

[0041] c (热媒介质) This indicates the specific heat capacity of the heat transfer medium.

[0042] m (热媒介质) This indicates the current flow rate of the heat transfer medium;

[0043] T1 and T2 represent the current inlet and outlet temperatures of the heat transfer medium, respectively.

[0044] As a further improvement of the present invention, the first flow meter is a mass flow meter;

[0045] When the cooling medium is a crude oil mixture, the mass and water content of the crude oil mixture are measured.

[0046] The specific heat capacity of the crude oil mixture is calculated based on the stated water content using the following formula:

[0047] c (原油混合介质) =c (原油) (1-ω)+c (水) ω

[0048] in,

[0049] c (原油) c (水) These represent the specific heat capacities of crude oil and water, respectively.

[0050] ω represents the moisture content.

[0051] As a further improvement of the present invention, if the heat value of the cold medium changes relative to the preset heat value of the cold medium, the reasons include changes in the flow rate of the cold medium, changes in the inlet temperature of the cold medium, and changes in the inlet temperature of the hot medium.

[0052] For each cause, based on the heat balance formula of the heat exchanger, linear equations for the flow rate of the cold medium and the flow rate of the hot medium, the inlet temperature of the cold medium and the flow rate of the hot medium, and the inlet temperature of the hot medium and the flow rate of the hot medium are established respectively.

[0053] Each thread equation is embedded into the heat advance calculation software in the heat controller. When the heat value of the cold medium changes relative to the preset heat value of the cold medium, the cause is determined, the heat medium flow rate is obtained according to the thread equation corresponding to the cause, and the linear regulating valve is adjusted according to the difference between the heat medium flow rate and the real-time value of the first flow meter.

[0054] As a further improvement of the present invention, after adjusting the linear regulating valve, the heat controller obtains the outlet temperature of the cold medium and compares it with the preset outlet temperature of the cold medium. If the preset outlet temperature of the cold medium is not reached, the linear regulating valve is cyclically adjusted until the preset outlet temperature of the cold medium is reached.

[0055] As a further improvement of the present invention, the variation ranges of the cold medium flow rate change, the cold medium inlet temperature change, and the hot medium inlet temperature change are respectively given;

[0056] When the changes in the flow rate of the cold medium, the inlet temperature of the cold medium, and the inlet temperature of the hot medium do not exceed the corresponding range of variation, the linear regulating valve will not operate.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0058] This invention monitors the operating conditions of the heat exchanger at the oilfield station by installing temperature transmitters on the inlet and outlet pipelines of the heat medium and cold medium, a flow meter on the inlet pipeline, and a linear regulating valve on the inlet pipeline of the heat medium, and connecting all of them to a heat controller. When the operating conditions change, the flow rate of the heat medium is controlled by the linear regulating valve to achieve automated temperature control.

[0059] This invention calculates the calorific value of the cold medium in a heat exchanger by installing heat advance calculation software in the heat controller, estimates the current required calorific value of the hot medium, calculates the flow rate of the hot medium based on the calorific value of the hot medium and the real-time values ​​of the first and second temperature transmitters, and adjusts the linear regulating valve based on the difference between the flow rate of the hot medium and the real-time value of the first flow meter to control the flow rate of the hot medium inlet, thereby achieving automatic control of the heat exchanger temperature.

[0060] This invention avoids excessively frequent operation of the linear regulating valve and extends its service life by setting the variation range of the cold medium flow rate, the cold medium inlet temperature, and the hot medium inlet temperature.

[0061] This invention uses a cyclic adjustment method. When a single adjustment fails to bring the cold medium outlet temperature to the preset cold medium outlet temperature, it uses a fine adjustment method until the cold medium outlet temperature reaches the preset cold medium outlet temperature. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of an intelligent temperature control heat exchange device for oilfield stations disclosed in one embodiment of the present invention;

[0063] Figure 2 This is a schematic diagram of the linear equations for the cold medium flow rate and the heat medium flow rate of the intelligent temperature control heat exchange device for oilfield stations disclosed in one embodiment of the present invention.

[0064] Figure 3 This is a schematic diagram of the linear equations for the cold medium inlet temperature and the heat medium flow rate of an intelligent temperature control heat exchange device for oilfield stations, as disclosed in one embodiment of the present invention.

[0065] Figure 4 This is a schematic diagram of the linear equations for the inlet temperature and flow rate of the heat medium in an intelligent temperature-controlled heat exchange device for oilfield stations, as disclosed in one embodiment of the present invention.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Heat exchanger; 2. Linear control valve; 3. First flow meter; 4. Second flow meter; 5. First temperature transmitter; 6. Third temperature transmitter; 7. Second temperature transmitter; 8. Fourth temperature transmitter; 9. Heat controller. Detailed Implementation

[0068] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0071] The present invention will now be described in further detail with reference to the accompanying drawings:

[0072] like Figure 1 As shown, the present invention provides an intelligent temperature control heat exchange device for oilfield stations, comprising: a heat exchanger 1 and a heat controller 9;

[0073] A linear regulating valve 2, a first flow meter 3, and a first temperature transmitter 5 are sequentially installed on the heat medium inlet pipe of heat exchanger 1 along the flow direction of the heat medium, and a second temperature transmitter 7 is installed on the heat medium outlet pipe.

[0074] A second flow meter 4 and a third temperature transmitter 6 are installed sequentially on the cold medium inlet pipe of heat exchanger 1 along the flow direction of the cold medium, and a fourth temperature transmitter 8 is installed on the cold medium outlet pipe.

[0075] Linear control valve 2, first flow meter 3, second flow meter 4, first temperature transmitter 5, second temperature transmitter 7, third temperature transmitter 6, and fourth temperature transmitter 8 are all connected to heat controller 9.

[0076] The heat controller 9 calculates the heat value of the cold medium in heat exchanger 1 based on the real-time values ​​of the second flow meter 4, the third temperature transmitter 6, and the fourth temperature transmitter 8. If the heat value of the cold medium changes relative to the preset heat value of the cold medium, the required heat value of the hot medium is calculated. The flow rate of the hot medium is calculated based on the heat value of the hot medium and the real-time values ​​of the first temperature transmitter 5 and the second temperature transmitter 7. Based on the difference between the flow rate of the hot medium and the real-time value of the first flow meter 3, the linear regulating valve 2 is adjusted to control the flow rate of the hot medium inlet, thereby achieving temperature control of heat exchanger 1.

[0077] in,

[0078] Preset heat values ​​for the cooling medium, including:

[0079] The inlet temperature T3 and outlet temperature T4 of the cold medium in heat exchanger 1 are preset, and the flow rate M of the cold medium is set. (冷媒介质) The formula for calculating the heat required for the cooling medium is:

[0080] Q (冷媒介质)=c (冷媒介质) M (冷媒介质) (T4-T3)

[0081] in,

[0082] c (冷媒介质) This indicates the specific heat capacity of the cooling medium.

[0083] Q (冷媒介质) As a preset heat value for the cold medium.

[0084] Furthermore,

[0085] First, the heat controller 9 obtains the inlet and outlet temperatures of the cold medium from the third temperature transmitter 6 and the fourth temperature transmitter 8, respectively, and obtains the flow rate of the cold medium from the second flow meter 4.

[0086] The heat controller 9 is equipped with heat advance calculation software. This software calculates the heat value of the cold medium in heat exchanger 1 based on the inlet and outlet temperatures and the flow rate of the cold medium. The formula is as follows:

[0087] q (冷媒介质) =c (冷媒介质) m (冷媒介质) (T B -T A );

[0088] In the formula,

[0089] c (冷媒介质) This indicates the specific heat capacity of the cooling medium.

[0090] m (冷媒介质) This indicates the current flow rate of the cooling medium;

[0091] T A T B These represent the current inlet and outlet temperatures of the refrigerant, respectively.

[0092] Secondly, the required heat value of the heat transfer medium is calculated based on the heat balance formula, which is:

[0093] q (热媒介质) η (换热效率) =q (冷媒介质)

[0094] In the formula,

[0095] q (冷媒介质) This indicates the current heat value of the cold medium in heat exchanger 1;

[0096] q (热媒介质) This indicates the current required heat value of the heat transfer medium;

[0097] η (换热效率)This indicates the heat exchange efficiency of heat exchanger 1.

[0098] Then, the flow rate of the heat medium is calculated based on the calorific value of the heat medium and the real-time values ​​of the first temperature transmitter 5 and the second temperature transmitter 7; including:

[0099] The flow rate of the heat medium is calculated using the formula for calculating the calorific value of the heat medium. The formula is as follows:

[0100] m (热媒介质) =q (热媒介质) / (c (热媒介质) (T1-T2)

[0101] in,

[0102] q (热媒介质) This indicates the current required heat value of the heat transfer medium;

[0103] c (热媒介质) This indicates the specific heat capacity of the heat transfer medium.

[0104] m (热媒介质) This indicates the current flow rate of the heat transfer medium;

[0105] T1 and T2 represent the current inlet and outlet temperatures of the heat transfer medium, respectively.

[0106] Furthermore,

[0107] In this invention, the first flow meter 3 is a mass flow meter, which measures the mass and water content of the crude oil mixture when the cold medium is a crude oil mixture.

[0108] The specific heat capacity of the crude oil mixture is calculated based on the water content using the following formula:

[0109] c (原油混合介质) =c (原油) (1-ω)+c (水) ω

[0110] In the formula,

[0111] c (原油) c (水) These represent the specific heat capacities of crude oil and water, respectively.

[0112] ω represents the moisture content.

[0113] In this invention, if the heat value of the cold medium changes relative to the preset heat value of the cold medium, the reasons include changes in the flow rate of the cold medium, changes in the inlet temperature of the cold medium, and changes in the inlet temperature of the hot medium.

[0114] For each cause, based on the heat balance formula of heat exchanger 1, linear equations are established for the flow rates of the cold and hot media, the inlet temperature of the cold media and the flow rate of the hot media, and the inlet temperature of the hot media and the flow rate of the hot media, respectively, as follows: Figure 2-4 As shown;

[0115] Each thread equation is embedded into the heat advance calculation software in the heat controller 9. When the heat value of the cold medium changes relative to the preset heat value of the cold medium, the cause is determined, the heat medium flow rate is obtained according to the thread equation corresponding to the cause, and the linear regulating valve 2 is adjusted according to the difference between the heat medium flow rate and the real-time value of the first flow meter 3.

[0116] After the linear regulating valve 2 is adjusted once, the heat controller 9 obtains the cold medium outlet temperature and compares it with the preset cold medium outlet temperature. If the preset cold medium outlet temperature is not reached, the linear regulating valve 2 is cyclically adjusted until the preset cold medium outlet temperature is reached.

[0117] Furthermore, in this invention, the variation ranges of the cold medium flow rate, the cold medium inlet temperature, and the hot medium inlet temperature are given respectively.

[0118] When the changes in the flow rate of the cold medium, the inlet temperature of the cold medium, and the inlet temperature of the hot medium do not exceed the corresponding range, the linear regulating valve 2 will not operate. For example, when the flow rate of the cold medium changes within ±1t / h, the regulating valve will not operate; when the inlet temperature of the cold medium and the inlet temperature of the hot medium change within ±3℃, the regulating valve will not operate.

[0119] This invention divides large oilfield stations, such as combined stations, into multiple thermal units, each equipped with an intelligent temperature-controlled heat exchange device. The heat controllers 9 (small PLCs) of these devices are network-connected and use a set of heat advance calculation software for heat distribution. When one thermal unit suddenly shuts down, it causes an excess of heat medium in other related thermal units. By collecting flow data through the advance calculation software, the heat required by the remaining thermal units is predicted in advance, and the linear regulating valve 2 is directly set to the predicted position. Thermal regulation can be completed in a short time, thereby ensuring that the temperature of other thermal units remains constant.

[0120] The flow data collected by the heat advance calculation software can also effectively display the heat consumption and heat exchange efficiency of each heat unit, identify problems in high-energy-consuming locations, improve the efficiency of heat use, and provide guiding basic data for energy use in production and residential communities.

[0121] Example:

[0122] Adjust the linear regulating valve 2, m according to the different operating conditions of heat exchanger 1. (冷媒介质)When the flow rate varies within ±1 t / h, the regulating valve does not operate; T 3(冷媒介质) and T 1(热媒介质) When the temperature varies within ±3℃, the control valve will not operate. If the range is set too small, the control valve will operate too frequently, reducing its lifespan.

[0123] Operating Condition 1: The refrigerant inlet temperature T3, required outlet temperature T4, and required heat transfer medium inlet temperature T1 and outlet temperature T2 are preset values. The variable is the refrigerant flow rate (m). (冷媒介质) and heat medium mass flow rate m (热媒介质) Construct a linear equation so that the two are approximately linearly related, such as Figure 2 As shown:

[0124] Based on refrigerant flow rate m (冷媒介质) and heat medium flow rate m (热媒介质) The two are approximately linearly related. A table listing all possible corresponding data is prepared in advance, and advanced heat calculation software is embedded. When m... 1(冷媒介质) Change to m 2(冷媒介质) At that time, look up the relational data table and find m. 1(热媒介质) Quickly adjust to m via linear regulating valve 2 2(热媒介质) This reduces the adjustment lag time.

[0125] Operating Condition 2: Refrigerant Inlet Flow Rate (m) (冷媒) The required outlet temperature T4, heat medium inlet temperature T1, and required outlet temperature T2 are preset values. The variables are the refrigerant inlet temperature T3 and the heat medium flow rate (m). (热媒介质) Construct a linear equation so that the two are approximately linearly related, such as Figure 3 As shown.

[0126] Based on the refrigerant inlet temperature T3 and the heat transfer flow rate m (热媒介质) The two are approximately linearly related. A table listing all possible corresponding data is prepared in advance, and advanced heat calculation software is embedded. When T... 3-1(冷媒介质) Change to T 3-2(冷媒介质) At that time, look up the relational data table and find m. 1(热媒介质) Quickly adjust to m via linear regulating valve 2 2(热媒介质) This reduces the adjustment lag time.

[0127] Operating Condition 3: Refrigerant inlet temperature T3, required outlet temperature T4, refrigerant flow rate (m) (冷媒) The required outlet temperature T2 of the heat medium is a pre-set value, and the variable is the heat medium flow rate m. (热媒) A linear equation is constructed based on the inlet temperature T1 of the heat medium, and the two have an approximately linear relationship, such as... Figure 4 As shown:

[0128] According to the heat medium flow rate m (热媒介质)The relationship between the inlet temperature of the heat transfer medium and T1 is approximately linear. A table listing all possible corresponding data is pre-listed, and advanced heat calculation software is embedded within it. When T... 1-1(热媒介质) Change to T 1-2(热媒介质) At that time, look up the relational data table and find m. 1(热媒介质) It can be quickly adjusted to m via linear regulating valve 2. 2(热媒介质) This reduces the adjustment lag time.

[0129] Advantages of this invention:

[0130] (1) By installing temperature transmitters on the inlet and outlet pipelines of the heat medium and cold medium of the heat exchanger, installing flow meters on the inlet pipeline, and installing linear regulating valves on the inlet pipeline of the heat medium, and connecting all of them to the heat controller, the operating conditions of the heat exchanger at the oilfield station can be monitored. When the operating conditions change, the flow rate of the heat medium can be controlled by the linear regulating valve to achieve automatic temperature control.

[0131] (2) By loading heat advance calculation software into the heat controller, the heat value of the cold medium in heat exchanger 1 is calculated, the heat value of the heat medium required at present is estimated, the heat medium flow rate is calculated based on the heat value of the heat medium and the real-time values ​​of the first temperature transmitter and the second temperature transmitter, and the linear regulating valve is adjusted based on the difference between the heat medium flow rate and the real-time value of the first flow meter to control the flow rate of the heat medium inlet and realize the automatic control of the temperature of heat exchanger 1.

[0132] (3) By setting the range of change of the cold medium flow rate, the cold medium inlet temperature, and the hot medium inlet temperature, the linear regulating valve is prevented from operating too frequently, thus extending the service life of the linear regulating valve.

[0133] (4) By cyclic adjustment, if the cold medium outlet temperature cannot reach the preset cold medium outlet temperature after one adjustment, fine adjustment is made until the cold medium outlet temperature reaches the preset cold medium outlet temperature.

[0134] The above are merely preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent temperature control heat exchange device for oilfield stations, characterized in that, include: Heat exchangers and heat controllers; A linear regulating valve, a first flow meter, and a first temperature transmitter are sequentially installed on the heat medium inlet pipe of the heat exchanger along the flow direction of the heat medium, and a second temperature transmitter is installed on the heat medium outlet pipe. A second flow meter and a third temperature transmitter are installed sequentially on the inlet pipe of the heat exchanger along the flow direction of the cold medium, and a fourth temperature transmitter is installed on the outlet pipe of the cold medium. The linear regulating valve, the first flow meter, the second flow meter, the first temperature transmitter, the second temperature transmitter, the third temperature transmitter, and the fourth temperature transmitter are all connected to the heat controller. The heat controller is equipped with heat advance calculation software. The heat advance calculation software establishes a linear equation based on heat balance. The heat controller calculates the heat value of the cold medium of the heat exchanger through the heat advance calculation software based on the real-time values ​​of the second flow meter, the third temperature transmitter and the fourth temperature transmitter. If the heat value of the cold medium changes relative to the preset heat value of the cold medium, first determine whether the cause of the change is a change in the flow rate of the cold medium, a change in the inlet temperature of the cold medium, or a change in the inlet temperature of the hot medium. Then, establish linear equations for the flow rate of the cold medium and the flow rate of the hot medium, the inlet temperature of the cold medium and the flow rate of the hot medium, and the inlet temperature of the hot medium and the flow rate of the hot medium, respectively, for each cause of change. Embed all linear equations into the heat advance calculation software. Obtain the heat value of the hot medium through the linear equations for the corresponding causes. Calculate the flow rate of the hot medium based on the heat value of the hot medium and the real-time values ​​of the first and second temperature transmitters. Adjust the linear regulating valve based on the difference between the flow rate of the hot medium and the real-time value of the first flow meter to control the flow rate of the hot medium inlet. Given the variation ranges of the cold medium flow rate, the cold medium inlet temperature, and the hot medium inlet temperature, the linear regulating valve does not operate when the variation of the cold medium flow rate, the cold medium inlet temperature, and the hot medium inlet temperature does not exceed the corresponding variation range, thereby achieving temperature control of the heat exchanger.

2. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: The heat controller obtains the inlet and outlet temperatures of the cold medium from the third and fourth temperature transmitters, respectively, and obtains the flow rate of the cold medium from the second flow meter. The heat advance calculation software calculates the heat value of the cold medium in the heat exchanger based on the inlet and outlet temperatures of the cold medium and the flow rate of the cold medium.

3. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: The formula for calculating the heat value of the cooling medium in a heat exchanger is: q （冷媒介质） =c （冷媒介质） m （冷媒介质） (T B -T A ); in, c （冷媒介质） This indicates the specific heat capacity of the cooling medium. m （冷媒介质） This indicates the current flow rate of the cooling medium; T A T B These represent the current inlet and outlet temperatures of the refrigerant, respectively.

4. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: Preset heat values ​​for the cooling medium, including: The inlet temperature T3 and outlet temperature T4 of the heat exchanger's refrigerant are preset, and the refrigerant flow rate M is set. （冷媒介质） The formula for calculating the heat required for the cooling medium is: Q （冷媒介质） = c （冷媒介质） M （冷媒介质） (T4-T3) in, c （冷媒介质） This indicates the specific heat capacity of the cooling medium. Q （冷媒介质） As a preset heat value for the cold medium.

5. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: Calculate the current required heat value of the heat transfer medium, including: According to the heat balance formula: q （热媒介质） η （换热效率） =q （冷媒介质） in, q （冷媒介质） This indicates the current heat value of the cooling medium in the heat exchanger; q （热媒介质） This indicates the current required heat value of the heat transfer medium; η （换热效率） This indicates the heat exchange efficiency of the heat exchanger.

6. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: The flow rate of the heat medium is calculated based on the calorific value of the heat medium and the real-time values ​​of the first and second temperature transmitters; including: The flow rate of the heat medium is calculated using the formula for calculating the calorific value of the heat medium. The formula is as follows: m （热媒介质） = q （热媒介质） / (c （热媒介质） (T1-T2)) in, q （热媒介质） This indicates the current required heat value of the heat transfer medium; c （热媒介质） This indicates the specific heat capacity of the heat transfer medium. m （热媒介质） This indicates the current heat medium flow rate; T1 and T2 represent the current inlet and outlet temperatures of the heat transfer medium, respectively.

7. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: The first flow meter is a mass flow meter; When the cooling medium is a crude oil mixture, the mass and water content of the crude oil mixture are measured. The specific heat capacity of the crude oil mixture is calculated based on the stated water content using the following formula: c （原油混合介质） = c （原油） (1-ω)+ c （水） oh in, c （原油） c （水） These represent the specific heat capacities of crude oil and water, respectively. ω represents the moisture content.

8. The intelligent temperature control heat exchange device for oilfield stations according to claim 1, characterized in that: When the heat value of the cold medium changes relative to the preset heat value of the cold medium, the cause is determined, the flow rate of the hot medium is obtained according to the corresponding thread equation, and the linear regulating valve is adjusted according to the difference between the flow rate of the hot medium and the real-time value of the first flow meter.

9. The intelligent temperature control heat exchange device for oilfield stations according to claim 1 or 8, characterized in that: After adjusting the linear regulating valve, the heat controller obtains the cold medium outlet temperature and compares it with the preset cold medium outlet temperature. If the preset cold medium outlet temperature is not reached, the linear regulating valve is cyclically adjusted until the preset cold medium outlet temperature is reached.

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