A heat exchange pipeline constant pressure maintenance control system and method

Abstract

The invention discloses a heat exchange pipeline constant pressure maintenance control system and method, and relates to the technical field of heat exchange pipeline constant pressure control. A data processing module is used to preprocess and analyze the pressure signal value collected in real time, and a corresponding monitoring and alarm mechanism is established. The preprocessed pressure data is processed by a data comparison module to obtain the adjustment value of the operating parameter of the water supply pump, so that the corresponding adjustment instruction is generated by the control decision module to adjust the fluid flow of the water supply pump. The invention establishes a dynamic monitoring mechanism to determine whether there is a local blockage or leakage problem in the pipeline system, improve the stability of the system, and can immediately adjust when the pressure deviates, so as to ensure that the pressure in the heat exchange pipeline is always maintained near the set constant value, reduce the influence of pressure fluctuation on the heat exchange process, and improve the cooling effect on forged petroleum coke.

Description

Technical Field

[0001] The present invention relates to the technical field of constant pressure control of heat exchange pipes, and in particular to a control system and method for maintaining constant pressure of heat exchange pipes. Background Art

[0002] The raw material of anode carbon blocks, petroleum coke, is calcined to form calcined petroleum coke, which is the solid residue produced by heating and distillation at high temperature after heavy oil is extracted from crude oil. It has certain compressive strength, electrical conductivity and chemical stability. The temperature of calcined petroleum coke is very high and needs to be cooled.

[0003] The cooling system generally uses a high-power water pump to pump the hot water that has undergone heat exchange in the cooling water jacket of the calcined petroleum coke into a water tank, and then the hot water in the water tank is pumped to the heating station for heat exchange heating through a high-power water pump. The water after heat exchange heating will be converted into cold water again and transported to the cooling water jacket for cooling the calcined petroleum coke to cool the calcined petroleum coke. After cooling, the hot water that has undergone heat exchange is pumped into the water tank again, and the cycle continues.

[0004] However, under the premise of a certain pipe diameter, for water of the same mass, the volume of hot water is greater than that of cold water, so the pressure of the hot water pipe will also be greater than that of the cold water pipe. Since the cooling water jacket has a certain height, if the pressure of the cold water pipe becomes smaller, the cold water supply in the cooling water jacket will be insufficient. Over time, steam will be generated in the water jacket, resulting in poor cooling effect of calcined petroleum coke. Summary of the invention

[0005] The object of the present invention is to provide a heat exchange pipeline constant pressure maintaining control system and method to solve the problems mentioned in the above process.

[0006] To achieve the above object, the present invention provides the following technical solutions: A heat exchange pipeline constant pressure maintenance control system, comprising: a data acquisition module, a data processing module, a data comparison module and a control decision module;

[0007] The data acquisition module is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time;

[0008] The data processing module is used to pre-process the collected pressure signal values, analyze and obtain the comprehensive pressure value and the target pressure value, and establish a monitoring and alarm mechanism based on the obtained analysis results;

[0009] The data comparison module is used to analyze and process the comprehensive pressure value processed by the data processing module and the target pressure value to obtain the adjustment value of the operating parameter of the water supply pump;

[0010] The control decision module is used to generate corresponding adjustment instructions according to the obtained adjustment values ​​of the operating parameters of the water replenishment pump, and adjust the fluid flow of the water replenishment pump through the corresponding adjustment instructions;

[0011] The data processing module includes a preprocessing unit and a data monitoring unit;

[0012] The pre-processing unit is used to clean and classify the pressure signal values ​​obtained in each area; the data monitoring unit is used to analyze the classified and integrated data to generate a monitoring alarm mechanism;

[0013] The process of the preprocessing unit cleaning and classifying and integrating the pressure signal values ​​obtained in each area includes:

[0014] Performing preliminary filtering on the pressure signal values ​​obtained in each area to identify and remove noise and pressure signal values ​​that are obviously deviated from the normal range; wherein the preliminary filtering method used is mean filtering or median filtering;

[0015] The pressure signal values ​​in each area after preliminary filtering are converted into units and standardized to ensure the consistency of the pressure signal values ​​collected by different sensors;

[0016] Regression analysis method is used to process and fill in the missing data points of pressure signal values ​​in different areas after unit conversion and standardization;

[0017] The preprocessing unit classifies and integrates the processed pressure signal values ​​to obtain the comprehensive pressure values ​​of the hot water pipe and the cold water pipe respectively. The formulas are:

[0018]

[0019] Where P avg,A and P avg,B Respectively represent the comprehensive pressure value of hot water pipe and the comprehensive pressure value of cold water pipe; j A Indicates the serial number of the pressure sensor in area A, j A =1,2……n A ; Indicates the jth A The pressure signal value collected by a pressure sensor; Indicates the jth A The weight value of the pressure signal value collected by the pressure sensor; and j B Indicates the serial number of the pressure sensor in area B, j B =1,2……n B ; Indicates the jth BThe pressure signal value collected by a pressure sensor; Indicates the jth B The weight value of the pressure signal value collected by the pressure sensor; and

[0020] Among them, the comprehensive pressure value of the hot water pipeline P avg,A Set as the target pressure value, and set the allowable pressure deviation threshold of the target pressure value to

[0021] Further, the data acquisition module includes a pressure sensor unit and a data transmission unit;

[0022] The pressure sensor unit is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time; the collection method is: setting area A and area B, each area is set with a number of pressure sensors, respectively collecting the pressure signal values ​​of the inlet and outlet of the pipeline and each node position after the pipeline is evenly segmented; wherein, the pressure sensors in area A collect the pressure signal values ​​in the hot water pipe in real time, and the pressure sensors in area B collect the pressure signal values ​​in the cold water pipe in real time;

[0023] The acquisition frequency of the pressure sensor set in the pressure sensor unit matches the pressure change speed in the pipeline and the system control accuracy;

[0024] The data transmission unit transmits the pressure signal values ​​collected by several sensors in the A area and the B area to the data processing module in real time through the CAN bus.

[0025] Furthermore, the data monitoring unit analyzes the classified and integrated data to generate a monitoring alarm mechanism, including:

[0026] Get the comprehensive pressure value P of the cold water pipeline avg,B The pressure deviation threshold And the cold water pipeline comprehensive pressure value P avg,B The pressure deviation threshold Make a comparison;

[0027] like The normal operation signal is output, and the comprehensive pressure value P of the cold water pipeline is avg,B and the target pressure value P avg,A Send to the data comparison module;

[0028] like Then output low pressure alarm signal;

[0029] like Then a high pressure alarm signal is output.

[0030] Furthermore, the analysis process of the data comparison module includes:

[0031] Get the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A ;

[0032] According to the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A Calculate the pressure deviation value ΔP, the formula is: ΔP = P avg,B -P avg,A ;

[0033] According to the operation characteristics and performance indicators of cold water pipes and hot water pipes, the proportional coefficient K in PID is automatically determined. P , integral coefficient K i , differential coefficient K d range.

[0034] The adjustment value of the operating parameter of the water supply pump is calculated according to the fuzzy PID control algorithm, and the obtained adjustment value of the operating parameter of the water supply pump is sent to the control decision module; the calculation formula of the adjustment value of the operating parameter of the water supply pump is:

[0035]

[0036] In the formula, K P is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, and U is the adjustment value of the operating parameters of the water supply pump.

[0037] Furthermore, the control decision module includes a water supply pump adjustment unit; the water supply pump adjustment unit receives the water supply pump operating parameter adjustment value U in the data comparison module in real time, analyzes the water supply pump operating parameter adjustment value U, and determines the adjustment instruction information, and the analysis process is:

[0038] If the adjustment value U of the operating parameter of the water supply pump is a positive value, an adjustment instruction to increase the fluid flow of the water supply pump is output; if the adjustment value U of the operating parameter of the water supply pump is a negative value, an adjustment instruction to reduce the fluid flow of the water supply pump is output.

[0039] Furthermore, the control decision module also includes a water make-up pump execution unit; the water make-up pump execution unit is used to control the driving system of the water make-up pump according to the obtained adjustment instructions; when the water make-up pump execution unit receives the corresponding adjustment instructions in the water make-up pump adjustment unit in real time, the driving system is controlled to change the speed frequency of the water make-up pump motor, and the fluid flow output by the water make-up pump to the cold water pipe is changed in real time to keep the pressure in the cold water pipe and the hot water pipe constant.

[0040] Furthermore, a method for controlling a heat exchange pipeline to maintain constant pressure comprises the following steps:

[0041] S1. Real-time collection of pressure signal values ​​of heat exchange pipes, including pressure signal values ​​of hot water pipes and pressure signal values ​​of cold water pipes;

[0042] S2. Classify and integrate the pressure signal values ​​of the hot water pipe and the cold water pipe to obtain the comprehensive pressure value of the hot water pipe and the comprehensive pressure value of the cold water pipe respectively, set the comprehensive pressure value of the hot water pipe as the target pressure value, set the allowable deviation threshold value according to the target pressure value and compare it with the comprehensive pressure value of the cold water pipe, and generate a corresponding monitoring alarm mechanism;

[0043] S3, calculating the pressure deviation between the cold water pipeline comprehensive pressure value and the target pressure value, and determining the adjustment value of the water supply pump operating parameters through fuzzy PID control algorithm analysis;

[0044] S4. Determine the corresponding adjustment instruction of the water supply pump through the adjustment value of the water supply pump operation parameter, and drive the water supply pump motor to change the speed frequency in real time according to the adjustment instruction, thereby affecting the fluid flow of the water supply pump entering the cold water pipeline, ensuring that the heat exchange pipeline is in a constant pressure state.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. The present invention provides a heat exchange pipeline constant pressure maintenance control system and method. During operation, the system can fully obtain the pressure signal values ​​of the cold water pipeline and the hot water pipeline by collecting pressure with a multi-partition sensor, reduce the blind area of ​​data collection, clean and integrate the collected data through a pre-processing unit, reduce the error caused by the inaccurate position of a single sensor or local interference, and comprehensively analyze the data of multiple collection points to improve the accuracy of the pressure signal value;

[0047] 2. The present invention sets the comprehensive pressure value in the hot water pipeline as the target pressure value, sets the allowable deviation threshold value according to the target pressure value, establishes a dynamic monitoring mechanism, generates a corresponding alarm mechanism through comparative analysis of the comprehensive pressure value of the cold water pipeline and the allowable deviation threshold value, and determines whether there is a local blockage or leakage problem in the cold water pipeline system, so as to carry out maintenance and processing in time and improve the stability of the system;

[0048] 3. The present invention obtains a pressure deviation result by comparing the comprehensive pressure value of the cold water pipeline with the target pressure value, uses a fuzzy PID control algorithm to determine the adjustment value of the operating parameters of the water supply pump, and quickly forms an adjustment control instruction through the water supply pump adjustment unit. It can drive the water supply pump motor to change the speed frequency in real time according to the adjustment instruction to adjust the fluid flow of the water supply pump entering the cold water pipeline, so that the system can immediately adjust when the pressure deviates, ensuring that the pressure in the heat exchange pipeline is always maintained near the set constant value, reducing the impact of pressure fluctuations on the heat exchange process, and improving the cooling effect on the forged petroleum coke. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a structural schematic diagram of a heat exchange pipeline constant pressure maintenance control system of the present invention;

[0050] Figure 2 The present invention is a flow chart of a method for controlling a constant pressure maintenance of a heat exchange pipeline. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Embodiment 1

[0053] A heat exchange pipe constant pressure maintenance control system of this embodiment, such as Figure 1 As shown, it includes a data acquisition module, a data processing module, a data comparison module and a control decision module;

[0054] The data acquisition module is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time;

[0055] The data processing module is used to pre-process the collected pressure signal values, analyze and obtain the comprehensive pressure value and the target pressure value, and establish a monitoring and alarm mechanism based on the obtained analysis results;

[0056] The data comparison module is used to analyze and process the comprehensive pressure value processed by the data processing module and the target pressure value to obtain the adjustment value of the operating parameters of the water supply pump;

[0057] The control decision module is used to generate corresponding adjustment instructions according to the obtained adjustment values ​​of the operating parameters of the water replenishment pump, and adjust the fluid flow of the water replenishment pump through the corresponding adjustment instructions.

[0058] The sensor unit in the heat exchange pipeline collects and obtains the pressure signal values ​​at different positions of the cold water pipeline and the hot water pipeline respectively. The pressure signal values ​​are transmitted to the preprocessing unit in the data processing module through the data transmission unit. The preprocessing unit cleans the received data and integrates multiple pressure signal values ​​in the two areas to obtain the comprehensive pressure value of the hot water pipeline and the comprehensive pressure value of the cold water pipeline respectively. The comprehensive pressure value of the hot water pipeline is set as the target pressure value, and the allowable pressure deviation threshold is set according to the target pressure value. The integration result is stored and sent to the data monitoring unit. The data monitoring unit establishes a corresponding alarm mechanism for the comprehensive pressure value of the cold water pipeline and the allowable pressure deviation threshold, and generates an alarm for abnormal comprehensive pressure value. An alarm signal is sent to the system, and the normal comprehensive pressure value is sent to the data comparison module. The data comparison module compares the comprehensive pressure value of the cold water pipe with the target pressure value to obtain the pressure deviation result, and analyzes the adjustment value of the water supply pump operating parameters through the fuzzy PID control algorithm. The water supply pump adjustment unit in the control decision module receives and analyzes the adjustment value of the water supply pump operating parameters sent in real time from the data comparison module, determines the water supply pump adjustment instruction information and feeds it back to the water supply pump execution unit. The water supply pump execution unit controls the drive system to change the speed frequency of the water supply pump motor according to the instruction information, and changes the fluid flow output by the water supply pump in the cold water pipe in real time to keep the pressure in the cold water pipe and the hot water pipe constant.

[0059] Embodiment 2

[0060] Based on the first embodiment, this embodiment refers to Figure 1 A heat exchange pipe constant pressure maintenance control system in Example 1 is further described in detail:

[0061] The data acquisition module includes a pressure sensor unit and a data transmission unit;

[0062] The pressure sensor unit is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time; the collection method is: setting area A and area B, each area is set with a number of pressure sensors, respectively collecting the pressure signal values ​​of the inlet and outlet of the pipeline and each node position after the pipeline is evenly segmented; wherein, the pressure sensors in area A collect the pressure signal values ​​in the hot water pipe in real time, and the pressure sensors in area B collect the pressure signal values ​​in the cold water pipe in real time;

[0063] The acquisition frequency of the pressure sensor set in the pressure sensor unit matches the pressure change speed in the pipeline and the system control accuracy;

[0064] The data transmission unit transmits the pressure signal values ​​collected by several sensors in area A and area B to the data processing module in real time through the CAN bus.

[0065] The data processing module includes a preprocessing unit and a data monitoring unit;

[0066] The pre-processing unit is used to clean and classify the pressure signal values ​​in each area; the data monitoring unit is used to analyze the classified and integrated data to generate a monitoring alarm mechanism.

[0067] The process of the preprocessing unit cleaning and classifying and integrating the pressure signal values ​​obtained in each area includes:

[0068] Performing preliminary filtering on the pressure signal values ​​obtained in each area to identify and remove noise and pressure signal values ​​that are obviously deviated from the normal range; wherein the preliminary filtering method used is mean filtering or median filtering;

[0069] The pressure signal values ​​in each area after preliminary filtering are converted into units and standardized to ensure the consistency of the pressure signal values ​​collected by different sensors;

[0070] Regression analysis method is used to process and fill in the missing data points of pressure signal values ​​in different areas after unit conversion and standardization;

[0071] The preprocessing unit classifies and integrates the processed pressure signal values ​​to obtain the comprehensive pressure values ​​of the hot water pipe and the cold water pipe respectively. The formulas are:

[0072]

[0073] Where P avg,A and P avg,B Respectively represent the comprehensive pressure value of hot water pipe and the comprehensive pressure value of cold water pipe; j A Indicates the serial number of the pressure sensor in area A, j A =1,2……n A ; Indicates the jth A The pressure signal value collected by a pressure sensor; Indicates the jth A The weight value of the pressure signal value collected by the pressure sensor; and j B Indicates the serial number of the pressure sensor in area B, j B =1,2……n B ; Indicates the jth B The pressure signal value collected by a pressure sensor; Indicates the jth B The weight value of the pressure signal value collected by the pressure sensor; and

[0074] Among them, the comprehensive pressure value of the hot water pipeline P avg,A Set as the target pressure value, and set the allowable pressure deviation threshold of the target pressure value to

[0075] Among them, based on the safety factor of the equipment and usage experience, the allowable pressure deviation threshold setting floating range is ±1% to ±5% of the target pressure value. If the historical data shows that the pressure fluctuation is relatively stable and small, the allowable pressure deviation threshold can be appropriately narrowed. If the pressure fluctuation in the historical data is large, it is necessary to reasonably relax the deviation threshold while ensuring the normal operation of the system.

[0076] The data monitoring unit analyzes the classified and integrated data to generate a monitoring alarm mechanism, including:

[0077] Get the comprehensive pressure value P of the cold water pipeline avg,B The pressure deviation threshold And the cold water pipeline comprehensive pressure value P avg,B The pressure deviation threshold Make a comparison;

[0078] like That is, the comprehensive pressure value in the cold water pipeline is within the allowable pressure deviation threshold, then the normal operation signal is output and the comprehensive pressure value P of the cold water pipeline is avg,B and the target pressure value P avg,A Send to the data comparison module;

[0079] like That is, the comprehensive pressure value of the cold water pipeline is less than the lower limit of the allowable pressure deviation threshold, and there is an abnormal situation of pipeline leakage. The data monitoring unit sends a low pressure alarm signal to the system output end;

[0080] like That is, the comprehensive pressure value in the cold water pipeline is greater than the upper limit of the allowable pressure deviation threshold, and there is an abnormal pipeline blockage. The data monitoring unit sends a high pressure alarm signal to the system output end.

[0081] Among them, the alarm mechanism set by the monitoring unit is connected to the display interface of the output end through an electrical medium, and the target pressure value, current pressure value and allowable pressure deviation range are clearly displayed on the display interface of the control system;

[0082] The data comparison module receives the cold water pipeline comprehensive pressure value p of the data monitoring unit in the data processing module in real time. avg,B and target pressure value p avg,A The comparative analysis process includes:

[0083] Get the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A ;

[0084] According to the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A Calculate the pressure deviation value ΔP, the formula is: ΔP = P avg,B -P avg,A ;

[0085] The adjustment value of the operating parameter of the water supply pump is calculated according to the fuzzy PID control algorithm, and the obtained adjustment value of the operating parameter of the water supply pump is sent to the control decision module; the calculation formula of the adjustment value of the operating parameter of the water supply pump is:

[0086]

[0087] In the formula, K P is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, U is the adjustment value of the operating parameters of the water supply pump;

[0088] The proportional coefficient K in PID P , integral coefficient K i , differential coefficient K d The approximate range is determined by the characteristics and performance indicators of the cold water pipe and hot water pipe operation, and the system is fine-tuned according to the actual operation of the pipe. The proportional coefficient K P It is used to quickly respond to the current pressure deviation value and determine the system's sensitivity to the pressure deviation value. The integral coefficient K i Used to eliminate the steady-state error of the system, the differential coefficient K d It is used to predict the changing trend of pressure deviation value and adjust the system in advance.

[0089] Among them, the fuzzy PID control algorithm is composed of fuzzy control and traditional PID controller. The control requirements of the PID controller are: when the received pressure deviation value is large, appropriately reduce the proportional coefficient and increase the differential coefficient to prevent excessive proportional gain and the water supply pump operating parameter adjustment value U from being too high; when the received pressure deviation value is small, increase the proportional coefficient and reduce the differential coefficient. When the received pressure deviation value has an increasing trend, it is necessary to increase the integral coefficient and differential coefficient; when the received pressure deviation value has a decreasing trend, appropriately reduce the integral coefficient and differential coefficient, and the water supply pump operating parameter adjustment value U will oscillate.

[0090] The control decision module includes a water supply pump adjustment unit and a water supply pump execution unit; the water supply pump adjustment unit receives the water supply pump operating parameter adjustment value U in the data comparison module in real time, analyzes the water supply pump operating parameter adjustment value U, and determines the adjustment instruction information; the analysis process is:

[0091] If the adjustment value U of the operating parameter of the make-up water pump is a positive value, indicating that the current comprehensive pressure in the cold water pipe is lower than the target pressure in the hot water pipe, then it is determined to output an adjustment instruction to increase the fluid flow rate of the make-up water pump; if the adjustment value U of the operating parameter of the make-up water pump is a negative value, indicating that the actual comprehensive pressure in the current cold water pipe is higher than the target pressure in the hot water pipe, then it is determined to output an adjustment instruction to reduce the fluid flow rate of the make-up water pump.

[0092] The feed water pump operating parameter adjustment value U is a direct speed setting value. The feed water pump adjustment unit analyzes the value and sign of the feed water pump operating parameter adjustment value U and sends a corresponding control instruction to the feed water pump execution unit in the form of a digital signal.

[0093] The water supply pump execution unit is used to control the driving system of the water supply pump according to the obtained adjustment instructions; when the water supply pump execution unit receives the corresponding adjustment instructions in the water supply pump adjustment unit in real time, it controls the driving system to change the speed frequency of the water supply pump motor, and changes the fluid flow output by the water supply pump to the cold water pipe in real time to keep the pressure in the cold water pipe and the hot water pipe constant.

[0094] Embodiment 3

[0095] The present invention provides Figure 2 A method for controlling constant pressure maintenance of a heat exchange pipeline is shown, comprising the following steps:

[0096] S1. Real-time collection of pressure signal values ​​of heat exchange pipes, including pressure signal values ​​of hot water pipes and pressure signal values ​​of cold water pipes;

[0097] S2. Classify and integrate the pressure signal values ​​of the hot water pipe and the cold water pipe to obtain the comprehensive pressure value of the hot water pipe and the comprehensive pressure value of the cold water pipe respectively, set the comprehensive pressure value of the hot water pipe as the target pressure value, set the allowable deviation threshold value according to the target pressure value and compare it with the comprehensive pressure value of the cold water pipe, and generate a corresponding monitoring alarm mechanism;

[0098] S3, calculating the pressure deviation between the cold water pipeline comprehensive pressure value and the target pressure value, and determining the adjustment value of the water supply pump operating parameters through fuzzy PID control algorithm analysis;

[0099] S4. Determine the corresponding adjustment instruction of the water supply pump through the adjustment value of the water supply pump operation parameter, and drive the water supply pump motor to change the speed frequency in real time according to the adjustment instruction, thereby affecting the fluid flow of the water supply pump entering the cold water pipeline, ensuring that the heat exchange pipeline is in a constant pressure state.

[0100] In summary, in the process of operation, the system in the above embodiment can fully obtain the pressure signal values ​​of the cold water pipe and the hot water pipe by collecting pressure with a multi-partition sensor, reduce the blind spot of data collection, clean and integrate the collected data through the preprocessing unit, reduce the error caused by the inaccurate position of a single sensor or local interference, and comprehensively analyze the data of multiple collection points to improve the accuracy of the pressure signal value. By setting the comprehensive pressure signal value in the hot water pipe as the target pressure value, setting the allowable deviation threshold according to the target pressure value, and establishing a dynamic monitoring mechanism, a corresponding alarm mechanism is generated by comparing and analyzing the comprehensive pressure value of the cold water pipe with the allowable deviation threshold, and judging It can be determined whether there is a local blockage or leakage problem in the cold water pipeline system, so as to carry out timely maintenance and processing to improve the stability of the system. The pressure deviation result is obtained by comparing the comprehensive pressure value of the cold water pipeline with the target pressure value, and the fuzzy PID control algorithm is used to determine the adjustment value of the operating parameters of the water supply pump. The adjustment control instruction is quickly formed through the water supply pump adjustment unit. The water supply pump motor speed frequency can be driven in real time according to the adjustment instruction to adjust the fluid flow of the water supply pump entering the cold water pipeline, so that the system can be adjusted immediately when the pressure deviates, ensuring that the pressure in the heat exchange pipeline is always maintained near the set constant value, reducing the impact of pressure fluctuations on the heat exchange process, and improving the cooling effect on forged petroleum coke.

[0101] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchange pipeline constant pressure maintenance control system, characterized in that: include: Data acquisition module, data processing module, data comparison module and control decision module; The data acquisition module is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time; The data processing module is used to pre-process the collected pressure signal values, analyze and obtain the comprehensive pressure value and the target pressure value, and establish a monitoring and alarm mechanism based on the obtained analysis results; The data comparison module is used to analyze and process the comprehensive pressure value processed by the data processing module and the target pressure value to obtain the adjustment value of the operating parameter of the water supply pump; The control decision module is used to generate corresponding adjustment instructions according to the obtained adjustment values ​​of the operating parameters of the water replenishment pump, and adjust the fluid flow of the water replenishment pump through the corresponding adjustment instructions; The data processing module includes a preprocessing unit and a data monitoring unit; The preprocessing unit is used to clean, classify and integrate the pressure signal values ​​obtained in each area; The data monitoring unit is used to analyze the classified and integrated data to generate a monitoring alarm mechanism; The process of the preprocessing unit cleaning and classifying and integrating the pressure signal values ​​obtained in each area includes: Performing preliminary filtering on the pressure signal values ​​obtained in each area to identify and remove noise and pressure signal values ​​that are obviously deviated from the normal range; wherein the preliminary filtering method used is mean filtering or median filtering; The pressure signal values ​​in each area after preliminary filtering are converted into units and standardized to ensure the consistency of the pressure signal values ​​collected by different sensors; Regression analysis method is used to process and fill in the missing data points of pressure signal values ​​in different areas after unit conversion and standardization; The preprocessing unit classifies and integrates the processed pressure signal values ​​to obtain the comprehensive pressure values ​​of the hot water pipe and the cold water pipe respectively. The formulas are: Where P avg,A and P avg,B Respectively represent the comprehensive pressure value of hot water pipe and the comprehensive pressure value of cold water pipe; j A Indicates the serial number of the pressure sensor in area A, j A =1,2……n A ;pj A Indicates the jth A The pressure signal value collected by a pressure sensor; wj A Indicates the jth A The weight value of the pressure signal value collected by the pressure sensor; and wj A >0;j B Indicates the serial number of the pressure sensor in area B, j B =1,2……n B ;pj B Indicates the jth B The pressure signal value collected by a pressure sensor; wj B Indicates the jth B The weight value of the pressure signal value collected by the pressure sensor; and wj B >0; Among them, the comprehensive pressure value of the hot water pipeline P avg,A Set as the target pressure value, and set the allowable pressure deviation threshold of the target pressure value to (MinP avg,A ,MaxP avg,A ).

2. A heat exchange pipeline constant pressure maintenance control system according to claim 1, characterized in that: The data acquisition module includes a pressure sensor unit and a data transmission unit; The pressure sensor unit is used to collect the pressure signal values ​​in the hot water pipe and the cold water pipe in real time; the collection method is: setting area A and area B, each area is set with a number of pressure sensors, respectively collecting the pressure signal values ​​of the inlet and outlet of the pipeline and each node position after the pipeline is evenly segmented; wherein, the pressure sensors in area A collect the pressure signal values ​​in the hot water pipe in real time, and the pressure sensors in area B collect the pressure signal values ​​in the cold water pipe in real time; The acquisition frequency of the pressure sensor set in the pressure sensor unit matches the pressure change speed in the pipeline and the system control accuracy; The data transmission unit transmits the pressure signal values ​​collected by several sensors in the A area and the B area to the data processing module in real time through the CAN bus.

3. A heat exchange pipeline constant pressure maintenance control system according to claim 1, characterized in that: The data monitoring unit analyzes the classified and integrated data to generate a monitoring alarm mechanism, including: Get the comprehensive pressure value P of the cold water pipeline avg,B The allowable pressure deviation threshold (MinP avg,A ,MaxP avg,A ), and the cold water pipeline comprehensive pressure value P avg,B The allowable pressure deviation threshold (MinP avg,A ,MaxP avg,A ) for comparison; If MinP avg,A ≤P avg,B ≤MaxP avg,A , then the normal operation signal is output, and the comprehensive pressure value of the cold water pipeline P avg,B and the target pressure value P avg,A Send to the data comparison module; If P avg,B <MinP avg,A , then output low pressure alarm signal; If P avg,B >MaxP avg,A , a high pressure alarm signal is output.

4. A heat exchange pipeline constant pressure maintenance control system according to claim 1, characterized in that: The analysis process of the data comparison module includes: Get the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A ; According to the comprehensive pressure value P of the cold water pipeline avg,B and the target pressure value P avg,A Calculate the pressure deviation value ΔP, the formula is: ΔP = P avg,B -P avg,A ; The adjustment value of the operating parameter of the water supply pump is calculated according to the fuzzy PID control algorithm, and the obtained adjustment value of the operating parameter of the water supply pump is sent to the control decision module; the calculation formula of the adjustment value of the operating parameter of the water supply pump is: In the formula, K P is the proportionality coefficient, K i is the integration coefficient, K d is the differential coefficient, and U is the adjustment value of the operating parameters of the water supply pump.

5. A heat exchange pipeline constant pressure maintenance control system according to claim 4, characterized in that: The control decision module includes a water supply pump adjustment unit; the water supply pump adjustment unit receives the water supply pump operating parameter adjustment value U in the data comparison module in real time, analyzes the water supply pump operating parameter adjustment value U, and determines the adjustment instruction information. The analysis process is: If the adjustment value U of the operating parameter of the water supply pump is a positive value, an adjustment instruction to increase the fluid flow of the water supply pump is output; if the adjustment value U of the operating parameter of the water supply pump is a negative value, an adjustment instruction to reduce the fluid flow of the water supply pump is output.

6. A heat exchange pipeline constant pressure maintenance control system according to claim 5, characterized in that: The control decision module also includes a water supply pump execution unit; the water supply pump execution unit is used to control the driving system of the water supply pump according to the obtained adjustment instructions; when the water supply pump execution unit receives the corresponding adjustment instructions in the water supply pump adjustment unit in real time, the driving system is controlled to change the speed frequency of the water supply pump motor, and the fluid flow output by the water supply pump to the cold water pipeline is changed in real time to keep the pressure in the cold water pipeline and the hot water pipeline constant.

7. A method for controlling constant pressure maintenance of a heat exchange pipeline, based on a control system for controlling constant pressure maintenance of a heat exchange pipeline according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Real-time collection of pressure signal values ​​of heat exchange pipes, including pressure signal values ​​of hot water pipes and pressure signal values ​​of cold water pipes; S2. Classify and integrate the pressure signal values ​​of the hot water pipe and the cold water pipe to obtain the comprehensive pressure value of the hot water pipe and the comprehensive pressure value of the cold water pipe respectively, set the comprehensive pressure value of the hot water pipe as the target pressure value, set the allowable deviation threshold value according to the target pressure value and compare it with the comprehensive pressure value of the cold water pipe, and generate a corresponding monitoring alarm mechanism; S3, calculating the pressure deviation between the cold water pipeline comprehensive pressure value and the target pressure value, and determining the adjustment value of the water supply pump operating parameters through fuzzy PID control algorithm analysis; S4. Determine the corresponding adjustment instruction of the water supply pump through the adjustment value of the water supply pump operation parameter, and drive the water supply pump motor to change the speed frequency in real time according to the adjustment instruction, thereby affecting the fluid flow of the water supply pump entering the cold water pipeline, ensuring that the heat exchange pipeline is in a constant pressure state.

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