An oil passage anti-blocking control method, device, system and asphalt station

Abstract

The application relates to the technical field of engineering machinery, in particular to an oil path anti-blocking control method, device and system and an asphalt station. The method comprises the following steps: acquiring a temperature error of material; determining a reference output frequency of an oil pump in a burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of a frequency converter of the oil pump in the burner based on the dynamic output frequency. The method determines the reference output frequency of the oil pump in the burner based on the temperature error, thereby ensuring that the temperature of the material is controlled in a controllable and accurate range, the reference output frequency of the oil pump is dynamically converted, the rotating speed of the oil pump is changed with the frequency, pressure fluctuation is formed in the oil path of the burner, the effect of pressure pulse is achieved in the oil path, and automatic cleaning and anti-blocking of the oil path of the burner are realized.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a method, device, system, and asphalt station for preventing oil circuit blockage. Background Technology

[0002] Asphalt plant burners typically use frequency converters to drive the blower and fuel pump. To ensure normal burner operation, the frequency converter's operating frequency needs to change with the material temperature. Currently, when the aggregate temperature in the burner changes, the adjustment of the frequency converter's operating frequency is mostly done manually. This frequency control method results in small fluctuations and lags in temperature control. Furthermore, when the selected fuel contains many impurities or has uneven density, particle deposition and nozzle blockage can easily occur in the burner's fuel circuit, and in more severe cases, it can cause abnormal ignition, flameout, and other shutdown malfunctions. Summary of the Invention

[0003] In view of this, this application provides an oil circuit anti-clogging control method, device, system and asphalt station, which solves or improves the technical problem that the frequency converter control method is lagging and easily causes burner oil circuit blockage in the prior art.

[0004] According to a first aspect of this application, this application provides an oil circuit anti-clogging control method, which includes: acquiring the temperature error of the material; determining a reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the oil pump frequency converter of the burner based on the dynamic output frequency.

[0005] In one possible implementation, determining the burner's reference output frequency based on the temperature error includes: determining the burner's reference output frequency based on the temperature error and its derivative.

[0006] In one possible implementation, determining the burner's reference output frequency based on the temperature error and its derivative includes: performing fuzzy inference on the temperature error and its derivative to obtain PID control coefficients; and determining the burner's reference output frequency based on the temperature error and the PID control coefficients.

[0007] In one possible implementation, the step of dynamically converting the reference output frequency to generate a dynamic output frequency includes: determining the dynamic output frequency based on the reference output frequency, preset dynamic adjustment parameters, and preset static adjustment parameters.

[0008] In one possible implementation, obtaining the temperature error of the material includes: obtaining the detection temperature of the material; performing Kalman filtering on the detection temperature to determine the current temperature of the material; and determining the temperature error based on the current temperature and the target temperature of the material.

[0009] In one possible implementation, after acquiring the temperature error of the material, the method further includes: acquiring the change in the supply of cold material; determining the reference output frequency of the burner based on the temperature error includes: determining the reference output frequency of the burner based on the temperature error and the change in supply.

[0010] In one possible implementation, obtaining the change in the supply of cold material includes: obtaining the change in the frequency of the cold material motor; and determining the change in the supply of cold material based on the change in the frequency.

[0011] In one possible implementation, after controlling the output frequency of the burner's oil pump inverter based on the dynamic output frequency, the method further includes: controlling the output frequency of the burner's blower inverter based on the dynamic output frequency and the air-oil ratio coefficient.

[0012] According to a second aspect of this application, this application also provides an oil circuit anti-clogging control device, which includes: an acquisition module for acquiring the temperature error of the material; a frequency control module for determining a reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the oil pump inverter of the burner based on the dynamic output frequency.

[0013] According to a third aspect of this application, this application also provides an oil circuit anti-clogging control system, which includes: a temperature detection device disposed in a burner for detecting the temperature of the material in the burner; a cold feed motor for supplying cold feed to the burner; the oil circuit anti-clogging control device as described above; and an oil pump frequency converter, which is communicatively connected to the oil circuit anti-clogging control device and electrically connected to the oil pump of the burner.

[0014] In one possible implementation, the oil circuit anti-clogging control system further includes: a blower frequency converter, which is communicatively connected to the oil circuit anti-clogging control device and electrically connected to the oil pump of the burner.

[0015] According to a fourth aspect of this application, this application also provides an asphalt station, which includes: an oil circuit anti-clogging control system as described in any of the preceding claims.

[0016] This application provides a method, device, system, and engineering machinery for preventing oil circuit blockage. The method specifically includes the following steps: acquiring the temperature error of the material; determining the reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the burner's oil pump inverter based on the dynamic output frequency. This method first acquires the temperature error of the material, determines the required temperature adjustment range, and determines the reference output frequency of the oil pump inverter in the burner based on this temperature error, thereby ensuring that the material temperature is controlled within a controllable and accurate range. On this basis, the reference output frequency of the oil pump inverter is dynamically converted within an appropriate range, allowing the oil pump speed to change with the dynamic frequency change, thus creating pressure fluctuations in the burner's oil circuit and achieving a pressure pulse effect. This achieves automatic cleaning and blockage prevention of the burner's oil circuit, while also reducing the fuel quality requirements during burner operation and saving costs. Attached Figure Description

[0017] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 The diagram shown is a schematic flowchart of an oil circuit anti-blocking control method provided in an embodiment of this application.

[0019] Figure 2 The diagram shown is a flowchart of an oil circuit anti-blocking control method provided in another embodiment of this application.

[0020] Figure 3 The diagram shown is a flowchart of an oil circuit anti-blocking control method provided in another embodiment of this application.

[0021] Figure 4 The diagram shown is a flowchart illustrating the method for obtaining the change in the supply of cold material in an oil circuit anti-blocking control method provided in another embodiment of this application.

[0022] Figure 5 The diagram shown is a structural schematic of the cold material motor and its frequency converter in the oil circuit anti-blocking control method provided in another embodiment of this application.

[0023] Figure 6 The diagram shown is a flowchart of an oil circuit anti-blocking control method provided in another embodiment of this application.

[0024] Figure 7The diagram shown is a structural block diagram of an oil circuit anti-clogging control device provided in an embodiment of this application.

[0025] Figure 8 The diagram shown is a structural block diagram of an oil circuit anti-clogging control system and an asphalt station provided in an embodiment of this application.

[0026] Figure 9 The diagram shown is a structural block diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0027] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0028] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Application Overview

[0030] In view of the technical problem that the frequency converter control method in the prior art is lagging and easily causes burner oil circuit blockage, this application provides an oil circuit anti-blockage control method, device, system and asphalt plant.

[0031] The oil circuit anti-clogging control method specifically includes the following steps: acquiring the temperature error of the material; determining the reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the burner's oil pump inverter based on the dynamic output frequency. The output frequency and rotational speed of the oil pump create pressure fluctuations in the burner's oil circuit. This oil circuit anti-clogging control method first acquires the temperature error of the material, determines the required temperature adjustment range, and determines the reference output frequency of the oil pump in the burner based on this temperature error, thereby ensuring that the material temperature is controlled within a controllable and accurate range. On this basis, the reference output frequency of the oil pump is dynamically converted within an appropriate range, allowing the oil pump rotational speed to change with the dynamic frequency change, thus creating pressure fluctuations in the burner's oil circuit, achieving a pressure pulse effect, thereby realizing automatic cleaning and anti-clogging of the burner's oil circuit, while reducing the quality requirements of the fuel during burner operation and saving costs.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] Exemplary methods

[0034] Figure 1 The diagram shown is a flowchart of an oil circuit anti-clogging control method provided in this application. Figure 1 As shown, the oil circuit anti-clogging control method provided in this application may specifically include the following steps:

[0035] Step 100: Obtain the temperature error of the material.

[0036] The aforementioned material refers to the material located in the chute of the drum. The temperature of the material is adjusted by combustion through a burner to maintain it at the required operating temperature for the asphalt plant. However, in actual production, it is difficult to keep the material temperature constant, inevitably leading to a discrepancy between the current temperature and the target temperature. Obtaining this current temperature error is crucial for adjusting the burner's output frequency and other parameters to ensure the actual material temperature is as close as possible to the target temperature.

[0037] Step 200: Determine the reference output frequency of the burner based on the temperature error.

[0038] A burner is a general term for a device that sprays fuel and air in a specific manner for combustion. Asphalt plants typically use oil-fired burners, which include structures such as oil pumps and blowers. The reference output frequency refers to the frequency at which the frequency converter controlling the burner needs to output to ensure that the temperature of the material in the chute remains constant or close to the target temperature. Under stable operating conditions, this reference output frequency usually also tends to stabilize, generally referring to the reference output frequency of the burner's fuel pump frequency converter. Determining the burner's reference output frequency, combined with the material's temperature error, makes the burner frequency converter's drive control of the burner more reliable and effective, ensuring that the actual temperature of the material is close to the target temperature.

[0039] Step 300: Dynamically convert the reference output frequency to generate a dynamic output frequency.

[0040] Dynamic output frequency refers to the output frequency after dynamic conversion of the reference output frequency. That is, a dynamic conversion factor is added to the reference output frequency signal, so that the reference output frequency signal is converted into a dynamically changed output frequency signal. This makes the drive of the oil pump by the frequency converter in the burner dynamic rather than stable. This allows the oil pump speed to change, thereby creating different pressure fluctuations in the oil circuit, and thus generating a pressure pulse effect. When the pressure increases, the oil circuit can be automatically cleaned and anti-clogging control can be achieved.

[0041] Step 400: Based on the dynamic output frequency, control the output frequency of the burner's oil pump frequency converter.

[0042] The oil pump frequency converter controls the output frequency and speed of the oil pump based on the output frequency signal. The dynamic output frequency signal input to the oil pump frequency converter causes the oil pump to be dynamically controlled, thereby creating pressure fluctuations in the burner's oil circuit. The burner's frequency converter includes the frequencies of the oil pump frequency converter and the blower frequency converter. When the output frequency of the burner frequency converter is a dynamic frequency, it can be understood that the oil pump frequency converter used to control the oil pump's output frequency also outputs a dynamically changing frequency, thus generating dynamic drives for the oil pump in different states. Combining the above, it can be seen that this can cause changes in the oil pump speed, creating pressure fluctuations in the oil circuit, and thus generating pressure pulses in the oil circuit.

[0043] The oil circuit anti-clogging control method provided in this application first obtains the temperature error of the material, determines the required temperature adjustment range of the material, and determines the reference output frequency of the oil pump in the burner based on the temperature error, thereby ensuring that the temperature of the material is controlled within a controllable and accurate range. On this basis, the reference output frequency of the oil pump is dynamically converted within an appropriate range, so that the output speed of the oil pump changes with the dynamic change of frequency, thereby generating pressure fluctuations in the burner's oil circuit, achieving a pressure pulse effect, and thus realizing automatic cleaning and anti-clogging of the burner's oil circuit. Simultaneously, it reduces the quality requirements of the fuel during burner operation, saving costs.

[0044] It is easy to understand that the burner is driven by the burner frequency converter, that is, the frequency converter outputs different frequencies to the burner, thereby driving the burner.

[0045] In one possible implementation, Figure 2 The diagram shown is a schematic flow chart of an oil circuit anti-clogging control method provided in another embodiment of this application. Figure 2 As shown, step 200 above (determining the burner's reference output frequency based on the material's temperature error) may further include the following steps:

[0046] Step 210: Determine the reference output frequency of the burner based on the temperature error and its derivative.

[0047] The specific calculation process of the derivative of temperature error is as follows: Substitute the temperature error of the material into the following calculation formula (1),

[0048]

[0049] Where e(t) represents the temperature error of the material at time t, and e'(t) represents the derivative of the temperature error of the material. The temperature error of the material is input into the control terminal, causing the calculation module to calculate the derivative of the temperature error, after which subsequent calculations can be performed.

[0050] Calculating the reference output frequency by combining temperature error can enable precise temperature control of the burner inverter's reference output frequency, thus helping to eliminate temperature error.

[0051] Specifically, in one embodiment, Figure 3 The diagram shown is a schematic flow chart of an oil circuit anti-clogging control method provided in another embodiment of this application. Figure 3 As shown, step 210 (determining the burner's reference output frequency based on the temperature error and its derivative) may further include the following steps:

[0052] Step 2101: Perform fuzzy inference on the temperature error and its derivative to obtain the PID control coefficients.

[0053] PID (Proportional-Integral-Derivative) control is a control method where the regulator's control law is proportional, integral, and derivative. The foundation of PID control is proportional control; integral control can eliminate steady-state error but may increase overshoot; derivative control can accelerate the response speed of large inertia systems and reduce overshoot tendency. A PID controller (Proportional-Integral-Derivative controller) is a common feedback loop component in industrial control applications, consisting of a proportional unit (P), an integral unit (I), and a derivative unit (D). By processing the temperature error of the material and using the calculated results as control coefficients in the PID control process, temperature error correction can be achieved, thereby generating an effective and reliable reference output frequency for the burner, thus bringing the actual temperature closer to the target temperature.

[0054] By performing fuzzy reasoning using the material temperature error e(t) and its derivative e'(t), the system's PID control coefficients Kp (proportional coefficient), kt (integral coefficient), and kd (derivative coefficient) can be obtained. Based on these material temperature errors e(t), Kp (proportional coefficient), kt (integral coefficient), and kd (derivative coefficient), the reference output frequency of the frequency converter used for burner drive control can be further determined and output.

[0055] Step 2102: Determine the reference output frequency of the burner based on the temperature error and the PID control coefficient.

[0056] Since the PID control coefficients mentioned above are obtained after processing the temperature error of the material, they have a more reliable and effective effect on correcting the temperature error of the material, thereby making the actual temperature of the material closer to the target temperature of the material.

[0057] Optional, such as Figure 2 As shown, step 300 (dynamically converting the reference output frequency to generate a dynamic output frequency) may include the following steps:

[0058] Step 310: Determine the dynamic output frequency based on the reference output frequency, preset dynamic adjustment parameters, and preset static adjustment parameters.

[0059] The preset dynamic adjustment parameters and preset static adjustment parameters are empirical coefficients pre-input into the system. The preset dynamic adjustment parameters are used to adjust the pulsation amplitude in the oil circuit, thereby achieving pressure pulses and dynamic impact effects in the oil pipeline. The preset static adjustment parameters allow for fine-tuning of the burner inverter's output frequency, thus improving the burner's heating effect. This reduces the impact of the dynamic output frequency on material temperature, achieving pulse cleaning of the oil pipeline while minimizing the influence on the material's approach to the target temperature.

[0060] Specifically, the reference output frequency signal, the preset dynamic adjustment parameters, and the preset static adjustment parameters are substituted into the following calculation formula (2) to calculate the dynamic output frequency signal.

[0061] y(t)=v(t)+ksin(t)+b (2)

[0062] Where y(t) represents the dynamic output frequency signal, v(t) represents the reference output frequency signal, k represents the preset dynamic adjustment parameter, and b represents the preset static adjustment parameter.

[0063] It should be understood that the above calculation formula is an exemplary calculation formula, and calculation formula (2) can also be:

[0064] y(t)=v(t)+kcos(t)+b

[0065] All formulas that can achieve dynamic conversion of the reference output frequency signal can be used to implement the above steps.

[0066] In another possible implementation, such as Figure 3 As shown, step 100 (obtaining the temperature error of the material) may further include the following steps:

[0067] Step 110: Obtain the detection temperature of the material.

[0068] The detected temperature of the material is its actual temperature within the conveyor. This can be achieved by installing temperature sensors or other temperature detection devices within the conveyor. Real-time acquisition of the detected temperature allows for comparison with the target temperature, thus revealing the material's temperature error.

[0069] Step 120: Perform Kalman filtering on the detected temperature to determine the current temperature of the material.

[0070] Kalman filtering is an algorithm that uses the state equations of a linear system to optimally estimate the system state by inputting and outputting observed data. Since the observed data includes noise and interference from the system, the optimal estimation can also be viewed as a filtering process. Specifically, it involves detecting the temperature of multiple sets of materials, filtering these sets of temperature data, and finally selecting the data that is closest to the actual temperature of the material in the conveyor as the current temperature of the material. Only in this way can the material temperature be effectively determined and thus effectively regulated.

[0071] Step 130: Determine the temperature error based on the current temperature and the target temperature of the material.

[0072] Substitute the current temperature and the target temperature of the material into the following calculation formula (3) to calculate the temperature error.

[0073] e(t)=s(t)-T(t) (3)

[0074] Where s(t) represents the target temperature of the material, and T(t) represents the current temperature of the material.

[0075] The error in calculating the temperature based on the detected temperature, which is close to the actual temperature of the material, can make subsequent temperature control more reliable. The selection of the burner's reference output frequency based on this temperature error is also more reliable.

[0076] Specifically, in another embodiment, such as Figure 3 As shown, after step 100, the following example illustrates the process after step 130 (determining the temperature error of the material based on its current temperature and target temperature). After step 130 (determining the temperature error based on its current temperature and target temperature), the above-mentioned oil circuit anti-clogging control method may further include the following steps:

[0077] Step 140: Obtain the change in the supply of cold material.

[0078] Cold feedstock refers to the material initially fed into the drum during the burner combustion process, i.e., material with a lower temperature. The amount of cold feedstock fed typically affects the real-time temperature of the material in the chute. The quantity of cold feedstock fed also influences temperature control; a larger quantity results in a greater temperature drop, while a smaller quantity results in a smaller temperature drop. Asphalt plants typically have a cold feedstock motor that controls the amount of cold feedstock supplied. This motor is driven by a corresponding frequency converter; therefore, the output frequency of the frequency converter controlling the cold feedstock motor affects the magnitude of the change in cold feedstock supply.

[0079] Based on step 140 above, step 200 above can be step 201 together with steps 210 to 220 above.

[0080] Step 201: Determine the reference output frequency of the burner based on the temperature error and the supply variation.

[0081] By combining the variation in the supply of cold feed with the temperature error of the material, a reference output frequency for the burner is generated. This allows the reference output frequency of the burner to be more adapted to the working conditions of the asphalt plant, thus making the temperature control of the material more effective.

[0082] Optional, Figure 4 The diagram shown is a flowchart illustrating the method for obtaining changes in the supply of cold material in an oil circuit anti-clogging control method provided in another embodiment of this application. Figure 4 As shown, step 140 (obtaining the change in the supply of cold material) may further include the following steps:

[0083] Step 1401: Obtain the frequency change of the cold material motor.

[0084] In the actual operation of an asphalt plant, the frequency of each cold material motor inverter will not be constant, and frequency fluctuations are inevitable. When the frequency of the cold material motor inverter changes, the speed at which the cold material motor supplies cold material will also change. Therefore, it is necessary to monitor the frequency change of the cold material motor in real time.

[0085] Step 1402: Determine the change in cold material supply based on the frequency change of the cold material motor.

[0086] Since the temperature of the material is affected when the supply of cold feed changes, it is necessary to monitor and calculate this change in order to adjust the output frequency of the burner in accordance with the change in the supply of cold feed.

[0087] Specifically, Figure 5 The diagram shown is a structural schematic of the cold material motor and its frequency converter in an oil circuit anti-clogging control method provided in another embodiment of this application. Figure 4 and Figure 5 As shown, the following will be explained using an asphalt plant equipped with 6 cold material motors as an example. When an asphalt plant is equipped with 6 cold material motors and used for 6 types of the same or different cold material feeds, the conversion frequency of the actual frequency of the cold material motor inverter relative to the cold material supply can be calculated by the following formula (4).

[0088] F=k1f1+k2f2+k3f3+k4f4+k5f5+k6f6 (4)

[0089] Where F is the total cold material output frequency, k1 to k6 are the conversion coefficients of cold material motor 1 to cold material motor 6 respectively. These coefficients are also empirical data, used to represent the correspondence between the actual output frequency of the cold material motor and the output frequency of the cold material motor and the cold material supply quantity; f1 to f6 represent the actual frequency of the frequency converter corresponding to cold material motor 1 to cold material motor 6 respectively.

[0090] The change in the supply of cold materials can be calculated using the following formula (5).

[0091] A (t-△t)=f(F(t-△t)-F1(t-△t)) (5)

[0092] Where A(t-△t) represents the change in the supply of cold material at time (t-△t), △t is the time interval during which the cold material is transported from the hopper to the drum, and t is the moment when the cold material is fed in.

[0093] In one possible implementation, such as Figure 1 As shown, after step 400 (controlling the output frequency of the burner's oil pump inverter based on the dynamic output frequency), the oil circuit anti-clogging control method provided in this application may further include the following steps:

[0094] Step 500: Based on the dynamic output frequency and the air-fuel ratio coefficient, control the output frequency of the blower frequency converter of the burner.

[0095] A blower is a device in a burner used to provide air for combustion.

[0096] The air-oil ratio is the ratio of the air intake to the oil intake in a burner.

[0097] With the oil pump under dynamic control, the blower should also be under dynamic control to ensure the heating effect of the burner on the material. Therefore, by combining the air-oil ratio coefficient and dynamic output power of the burner, the dynamic output frequency of the blower frequency converter can be calculated and the blower frequency converter can be controlled accordingly, thereby effectively ensuring the temperature control effect of the burner on the material.

[0098] Specifically, Figure 6 The diagram shown is a schematic flow chart of an oil circuit anti-clogging control method provided in another embodiment of this application. Figure 6As shown, the implementation process of the oil circuit anti-clogging control method provided in this application can be specifically as follows: PID control is performed based on parameters such as the target temperature s(t) and the current temperature T(t) of the material. That is, multiple detection temperatures of the material in the burner chute are detected by a temperature detection device installed in the chute. After Kalman filtering of these multiple detection temperatures, the current temperature T(t) of the material is obtained. Then, the difference between the target temperature s(t) and the current temperature T(t) is calculated to obtain the temperature difference e(t). After differentiating the temperature error e(t), the derivative of the temperature error e'(t) is obtained. Then, fuzzy inference is performed on the temperature error e(t) and the derivative of the temperature error e'(t) to obtain the PID control coefficients Kp (proportional coefficient), kt (integral coefficient), and kd (derivative coefficient). The PID algorithm is then performed to obtain the intermediate output frequency signal u(t) (which can be understood as the reference output frequency signal without combining the supply change of cold material A(t-Δt)). Based on the frequency change of the cold material motor, the cold material temperature can be calculated. The change in feed supply, A(t-Δt), is used as the basis for calculating the reference output frequency signal v(t) based on the intermediate output frequency signal u(t) and the change in cold feed supply, A(t-Δt). This reference output frequency signal v(t) undergoes dynamic frequency conversion to obtain the dynamic output frequency signal y(t). This dynamic output frequency signal y(t) is transmitted to the control input of the burner's oil pump inverter (i.e., the controlled object), allowing the oil pump inverter to control the oil pump speed based on this dynamic output frequency signal y(t). Ultimately, the oil pump's output speed changes with the dynamic frequency, creating pressure fluctuations in the burner's oil circuit, achieving a pressure pulse effect. This enables automatic cleaning and anti-clogging of the burner's oil circuit, while also reducing the fuel quality requirements during burner operation and saving costs. Furthermore, by combining the air-fuel ratio coefficient p and the dynamic output frequency signal y(t) of the oil pump inverter, the blower frequency signal of the blower inverter is calculated, allowing for reasonable speed control of the blower.

[0099] Corresponding to the above-mentioned oil circuit anti-clogging control method, this application also discloses an oil circuit anti-clogging control device. Figure 7 The diagram shown is a structural block diagram of an oil circuit anti-clogging control device according to an embodiment of this application. See also... Figure 7 As shown, this oil circuit anti-clogging control device 100 may specifically include: an acquisition module 101 and a frequency control module 102.

[0100] The acquisition module 101 is used to acquire the temperature error of the material; the frequency control module 102 is used to determine the reference output frequency of the burner based on the temperature error; and to dynamically convert the reference output frequency to generate a dynamic output frequency; and to control the output frequency of the oil pump inverter of the burner based on the dynamic output frequency; in addition, the output frequency and speed of the oil pump cause pressure fluctuations in the oil circuit of the burner.

[0101] The oil circuit anti-clogging control device 100 provided in this application includes an acquisition module 101 for acquiring the temperature error of the material; a frequency control module 102 for determining the reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the burner's oil pump frequency converter based on the dynamic output frequency. Furthermore, the output frequency and rotational speed of the oil pump cause pressure fluctuations in the burner's oil circuit. This oil circuit anti-clogging control device 100 can perform the following steps: acquiring the temperature error of the material; determining the reference output frequency of the burner based on the temperature error; dynamically converting the reference output frequency to generate a dynamic output frequency; and controlling the output frequency of the burner's oil pump frequency converter based on the dynamic output frequency. This oil circuit anti-clogging control device 100 first acquires the temperature error of the material, determines the required temperature adjustment range of the material, and determines the reference output frequency of the oil pump in the burner based on the temperature error, thereby ensuring that the temperature of the material is controlled within a controllable and accurate range. Based on this, the reference output frequency is dynamically converted within an appropriate range, so that the output speed of the oil pump can change with the dynamic change of the frequency, thereby forming pressure fluctuations in the oil circuit of the burner and achieving the effect of pressure pulse in the oil circuit. This enables automatic cleaning and anti-clogging of the burner oil circuit, while reducing the quality requirements of the fuel during burner operation and saving costs.

[0102] In one possible implementation, such as Figure 7 As shown, the aforementioned oil circuit anti-clogging control device 100 may further include: a PID control module 103, a temperature determination module 104, and a cold feed supply determination module 105. The PID control module 103 is used to perform fuzzy inference on the temperature error and its derivative based on the temperature error, to obtain PID control coefficients, and ultimately determine the burner's reference output frequency. The temperature determination module 104 is used to perform Kalman filtering on the detected temperature of the material to determine the current temperature of the material; based on the current temperature of the material and the target temperature of the material, it determines the temperature error of the material. The cold feed supply determination module 105 is used to determine the change in the cold feed supply based on the frequency change of the cold feed motor 300.

[0103] Specifically, the aforementioned acquisition module 101 can also be used to acquire the detection temperature of the material, acquire the supply change of the cold material, acquire the frequency change of the cold material motor 300, etc.

[0104] In addition, another embodiment of this application proposes an oil circuit anti-clogging control system. Figure 8 The diagram shown is a structural block diagram of an oil circuit anti-clogging control system and an asphalt plant according to an embodiment of this application. Figure 8 As shown, this oil circuit anti-clogging control system may include: a temperature detection device 200, a cold feed motor 300, an oil pump frequency converter 401, and the oil circuit anti-clogging control device 100 in the above embodiment. The temperature detection device 200 is installed in the burner chute and is used to detect the temperature of the material in the burner; the cold feed motor 300 is used to supply cold feed to the burner; the oil circuit anti-clogging control device 100 is used to output the reference output frequency signal of the burner, the dynamic output frequency signal of the burner, and the output frequency signal of the oil pump; the oil pump frequency converter 401 is communicatively connected to the oil circuit anti-clogging control device 100 and electrically connected to the oil pump of the burner, and is used to adjust the speed of the oil pump according to the dynamic output frequency signal.

[0105] Since the above-mentioned oil circuit anti-blocking control system includes the above-mentioned oil circuit anti-blocking control device 100, it can implement the oil circuit anti-blocking control method in the above embodiments, and the beneficial effects it produces are the same as those of the above-mentioned device, which will not be repeated here.

[0106] In one possible implementation, such as Figure 8 As shown, the aforementioned oil circuit anti-clogging control system may further include: a cold feed motor frequency converter 301. The cold feed motor frequency converter 301 is communicatively connected to the oil circuit anti-clogging control device 100 and is used to adjust the speed of the cold feed motor 300. The oil circuit anti-clogging control system also includes: a blower frequency converter 402. This blower frequency converter 402 is communicatively connected to the oil circuit anti-clogging control device 100 and electrically connected to the burner's oil pump. The blower frequency converter 402 is used to adjust the blower speed according to the blower's dynamic output frequency signal. By receiving the blower's dynamic output frequency signal output by the aforementioned oil circuit anti-clogging control device 100 and adjusting the blower speed accordingly, the oil circuit cleaning effect is improved.

[0107] Another embodiment of this application provides an asphalt station that includes the aforementioned oil circuit anti-clogging control system.

[0108] The aforementioned asphalt station, by incorporating the aforementioned oil circuit anti-clogging control system, can dynamically switch the reference output frequency of the oil pump within an appropriate range. This allows the output speed of the oil pump to change dynamically with the frequency, thereby creating pressure fluctuations in the burner's oil circuit and achieving a pressure pulse effect. This enables automatic cleaning and anti-clogging of the burner's oil circuit, while also reducing the fuel quality requirements during burner operation and saving costs.

[0109] Below, for reference Figure 9 This describes an electronic device according to embodiments of the present application.

[0110] Figure 9 A block diagram of an electronic device according to an embodiment of this application is illustrated.

[0111] like Figure 9 As shown, the electronic device 10 includes one or more processors 11 and memory 12.

[0112] The processor 11 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0113] The memory 12 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 11 may execute the program instructions to implement the oil circuit anti-blocking control methods of the various embodiments of this application described above, and / or other desired functions.

[0114] In one example, the electronic device 10 may also include an input device 13 and an output device 14, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0115] When the electronic device is a standalone device, the input device 13 can be a communication network connector for receiving the collected input signals from the first device and the second device.

[0116] In addition, the input device 13 may also include, for example, a keyboard, a mouse, etc.

[0117] The output device 14 can output various information to the outside, including determined distance information, direction information, etc. The output device 14 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0118] Of course, for the sake of simplicity, Figure 9 Only some of the components of the electronic device 10 relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the electronic device 10 may include any other suitable components depending on the specific application.

[0119] As a third aspect of this application, this application provides a computer-readable storage medium storing a computer program for performing the following steps:

[0120] The temperature error of the material is obtained; based on the temperature error of the material, the reference output frequency of the burner is determined; the reference output frequency of the burner is dynamically converted to generate the dynamic output frequency of the burner; and based on the dynamic output frequency of the burner, the output frequency and speed of the oil pump are determined; wherein, the output frequency and speed of the oil pump cause pressure fluctuations in the oil circuit of the burner.

[0121] Specifically, the above-mentioned computer program can also perform the following steps:

[0122] Based on the material's temperature error, determine the PID control coefficients; based on the PID control coefficients, determine the burner's reference output frequency. Obtain the derivative of the material's temperature error; perform fuzzy inference on the material's temperature error and its derivative to determine the PID control coefficients. Based on the burner's reference output frequency, preset dynamic adjustment parameters, and static adjustment parameters, determine the burner's dynamic output frequency. Obtain the material's detected temperature; perform Kalman filtering on the detected temperature to determine the material's current temperature; based on the current temperature and the target temperature, determine the material's temperature error. Obtain the change in cold feed supply; based on the material's temperature error, determine the burner's reference output frequency, including: based on the material's temperature error and the change in cold feed supply, determine the burner's reference output frequency. Obtain the frequency change of the cold feed motor; based on the frequency change of the cold feed motor, determine the change in cold feed supply. Based on the oil pump's output frequency and the air-oil ratio coefficient, determine the blower's dynamic output frequency.

[0123] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program information. When the computer program information is run by a processor, it causes the processor to perform the steps in the oil circuit anti-blocking control methods according to various embodiments of this application as described in this specification.

[0124] Computer program products can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0125] Furthermore, embodiments of this application may also be computer-readable storage media storing computer program information thereon, which, when run by a processor, causes the processor to execute the steps in the oil circuit anti-blocking control method according to various embodiments of this application.

[0126] Computer-readable storage media may take the form of any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0127] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0128] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0129] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

Claims

1. A method for preventing oil circuit blockage, characterized in that, A fuel-fired burner used in asphalt plants, the burner being used to adjust the temperature of materials through combustion; the method includes: Obtain the temperature error of the material; Based on the temperature error, the reference output frequency of the burner is determined; A dynamic conversion factor is added to the reference output frequency signal to dynamically convert the reference output frequency and generate a dynamic output frequency; and Based on the dynamic output frequency, the output frequency of the oil pump inverter of the burner is controlled to change the speed of the oil pump driven by the oil pump inverter, so that the oil circuit pressure of the burner fluctuates to form a pressure pulse.

2. The oil circuit anti-clogging control method according to claim 1, characterized in that, Determining the burner's reference output frequency based on the temperature error includes: The reference output frequency of the burner is determined based on the temperature error and its derivative.

3. The oil circuit anti-clogging control method according to claim 2, characterized in that, Determining the burner's reference output frequency based on the temperature error and its derivative includes: Fuzzy inference is performed on the temperature error and its derivative to obtain the PID control coefficients; The reference output frequency of the burner is determined based on the temperature error and the PID control coefficient.

4. The oil circuit anti-clogging control method according to claim 1, characterized in that, The step of dynamically converting the reference output frequency to generate a dynamic output frequency includes: The dynamic output frequency is determined based on the reference output frequency, preset dynamic adjustment parameters, and preset static adjustment parameters.

5. The oil circuit anti-clogging control method according to claim 1, characterized in that, The temperature error of the material is obtained, including: Obtain the detection temperature of the material; The detected temperature is processed by Kalman filtering to determine the current temperature of the material; The temperature error is determined based on the current temperature and the target temperature of the material.

6. The oil circuit anti-clogging control method according to any one of claims 1 to 5, characterized in that, After obtaining the temperature error of the material, the method further includes: Obtain changes in the supply of cold materials; Determining the burner's reference output frequency based on the temperature error includes: The reference output frequency of the burner is determined based on the temperature error and the supply variation.

7. The oil circuit anti-clogging control method according to claim 6, characterized in that, The acquisition of changes in the supply of cold materials includes: To obtain the frequency change of the cold material motor; Based on the frequency change, the change in the supply of cold material is determined.

8. The oil circuit anti-clogging control method according to claim 1, characterized in that, After controlling the output frequency of the burner's oil pump inverter based on the dynamic output frequency, the method further includes: Based on the dynamic output frequency and the air-fuel ratio coefficient, the output frequency of the blower frequency converter of the burner is controlled.

9. A hydraulic circuit anti-clogging control device, characterized in that, A fuel-fired burner used in asphalt plants, the burner being used to adjust the temperature of materials through combustion; the device includes: The acquisition module is used to acquire the temperature error of the material; The frequency control module is used to determine the reference output frequency of the burner based on the temperature error; and to add a dynamic conversion factor to the reference output frequency signal to dynamically convert the reference output frequency and generate a dynamic output frequency; and to control the output frequency of the oil pump inverter of the burner based on the dynamic output frequency to change the speed of the oil pump driven by the oil pump inverter, so as to cause the oil circuit pressure of the burner to fluctuate to form a pressure pulse.

10. An oil circuit anti-clogging control system, characterized in that, include: A temperature detection device is installed in the burner to detect the temperature of the material in the burner; A cold feed motor, which is used to supply cold feed to the burner; The oil circuit anti-clogging control device as described in claim 9; The oil pump frequency converter is communicatively connected to the oil circuit anti-clogging control device and electrically connected to the oil pump of the burner.

11. The oil circuit anti-clogging control system according to claim 10, characterized in that, Also includes: The blower frequency converter is communicatively connected to the oil circuit anti-clogging control device. It is electrically connected to the oil pump of the burner.

12. An asphalt station, characterized in that, Includes the oil circuit anti-clogging control system as described in claim 10 or claim 11.

Images