Combustor control method and system for self-adaption of aggregate water content of asphalt station

Abstract

The invention discloses an asphalt station self-adaptive aggregate water content combustor control method and system, and the method comprises the steps: obtaining the water content information of each aggregate, and calculating the weighted average of the aggregate water content in a preset time period; calculating the difference value between the weighted average value of the water content of the aggregate and the standard water content, and if the difference value is within a preset range, not adjusting the current load of the combustor; if the difference value exceeds the preset range, the current load of the combustor is adjusted according to the difference value; and recording the weighted average value of the water content of the aggregate as a new standard water content, and carrying out repeated iterative calculation and load adjustment of a combustor according to a preset time period until the production of the asphalt mixture is finished. The load of the combustor can be automatically adjusted by the asphalt station according to the water content of the aggregate, energy waste is reduced, the stability of product quality is improved, an operator can clearly master the water content condition of the aggregate, the workload of the operator is reduced, and the production efficiency and the automation degree are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of burner control, and in particular relates to a burner control method and system for adaptive aggregate moisture content in an asphalt station. Background Art

[0002] Aggregates are the main components of asphalt mixtures. Even a slight change in their moisture content will have a significant impact on the combustion efficiency of the asphalt plant and the quality of the finished product. Usually, when purchasing aggregates, asphalt plants require the moisture content of aggregates to be below 5%. After the aggregates enter the factory, the moisture content of the aggregates will change with the storage time and environment. According to actual data statistics, for every 1% increase in moisture content, the fuel consumption of the burner increases by about 10%, and the production efficiency decreases by more than 10%. When operators adjust the burner during the production process, they often rely on manual experience. This method is difficult to accurately adapt to changes in aggregate moisture content in real time, resulting in energy waste and unstable product quality, and also reduces the overall production efficiency of the asphalt plant. Therefore, it is particularly urgent and necessary to design a burner control method and system that can adapt to the moisture content of aggregates. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a burner control method and system for an asphalt station that is adaptive to the moisture content of aggregates, which can enable the asphalt station to automatically adjust the load of the burner according to the moisture content of aggregates, reduce energy waste, improve the stability of product quality, enable operators to clearly understand the moisture content of aggregates, reduce operator workload, and improve production efficiency and automation.

[0004] The present invention provides the following technical solutions: In a first aspect, a burner control method for an asphalt station adaptively controlling aggregate moisture content is provided, comprising: Obtaining moisture content information of each aggregate, and calculating a weighted average moisture content of the aggregate within a preset time period based on the moisture content information of each aggregate; Calculate the difference between the weighted average value of aggregate moisture content and the standard moisture content. If the difference is within the preset range, the current load of the burner is not adjusted; if the difference exceeds the preset range, the current load of the burner is adjusted according to the difference; Recording the weighted average of the aggregate moisture content as a new standard moisture content, calculating the difference between the weighted average of the aggregate moisture content in the next preset time period and the new standard moisture content, and judging whether and how to adjust the current load of the burner according to the difference; Repeated iterative calculation and burner load adjustment are performed according to a preset time period until the asphalt mixture production is completed.

[0005] Furthermore, the step of calculating the weighted average moisture content of the aggregates within a preset time period according to the moisture content information of each aggregate includes: Get the formula of asphalt mixture; The mass proportion of each aggregate in the formula is used as the weight to calculate the weighted average moisture content of the aggregate within the preset time period.

[0006] Furthermore, the preset time period is the transportation time of the aggregate from the silo to the burner end.

[0007] Furthermore, the difference value includes within a preset range: an absolute value of the difference value is less than 1%.

[0008] Furthermore, if the difference exceeds a preset range, adjusting the current load of the burner according to the difference includes: If the absolute value of the difference is ≥ 1%, it is determined that the current load of the burner needs to be adjusted; If the difference is positive, increasing the current load of the burner; If the difference is negative, the current load on the burner is reduced.

[0009] Further, when increasing or decreasing the current load of the burner, the adjustment amount of the burner load is 5 times of the difference.

[0010] In a second aspect, a burner control system for an asphalt station that is adaptive to aggregate moisture content is provided, comprising: Moisture content sensor, used to detect the moisture content information of each aggregate; A drying drum connected to a burner is used to mix and burn various aggregates; The control mechanism is connected to the moisture content sensor and the burner respectively, and is used to execute the burner control method for adaptive aggregate moisture content in an asphalt station as described in the first aspect.

[0011] Furthermore, it also includes a conveyor belt and a plurality of silos, wherein the silos are arranged in sequence along the conveying direction of the conveyor belt, and the silos are used to store various aggregates.

[0012] Furthermore, the moisture content sensor is installed on the silo wall of the material outlet.

[0013] Furthermore, the control mechanism includes an electrically connected programmable controller and a host computer, wherein the host computer is used to receive data information sent by the programmable controller, calculate and determine whether burner load adjustment is required based on the received data information, and send a control command to the programmable controller.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention determines whether the current load of the burner needs to be adjusted by calculating the difference between the weighted average moisture content of the aggregate and the standard moisture content. If the difference is within a preset range, the current load of the burner is not adjusted. If the difference exceeds the preset range, the current load of the burner is adjusted according to the difference; the weighted average moisture content of the aggregate is recorded as the new standard moisture content, the difference between the weighted average moisture content of the aggregate in the next preset time period and the new standard moisture content is calculated, and whether and how to adjust the current load of the burner is determined according to the difference; repeated iterative calculations and burner load adjustment are performed according to the preset time period until the asphalt mixture production is completed. The present invention can realize that the asphalt station automatically adjusts the load of the burner according to the moisture content of the aggregate, reduces energy waste, improves the stability of product quality, enables the operator to clearly grasp the moisture content of the aggregate, reduces the workload of the operator, and improves production efficiency and automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of a burner control method for adaptive aggregate moisture content in an asphalt plant according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of a burner control system for adaptive aggregate moisture content in an asphalt plant according to an embodiment of the present invention; The markings in the figure are: 1. silo; 2. moisture content sensor; 3. conveyor belt; 4. drying drum; 5. burner; 8. control mechanism. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0017] The term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the associated objects are in an "or" relationship.

[0018] Example 1

[0019] like Figure 1 As shown, this embodiment provides a burner control method for an asphalt station adaptively adjusting the moisture content of aggregates, and the steps are as follows: Step 1: Obtain the moisture content information of each aggregate, and calculate the weighted average moisture content of the aggregate within a preset time period based on the moisture content information of each aggregate.

[0020] During production, the formula of asphalt mixture is obtained; the mass proportion of each aggregate in the formula is used as the weight. After the burner is ignited, the operator sets the current burner load and starts to calculate the weighted average moisture content H of the aggregate in the first preset time period T. T The preset time period T is the transportation time of the aggregate from the silo to the burner end or other custom time.

[0021] Step 2: Calculate the weighted average moisture content of aggregate H T With standard moisture content H B The difference H C , if the difference H C Within the preset range, the current load of the burner is not adjusted; if the difference H C If it exceeds the preset range, the current load of the burner is adjusted according to the difference.

[0022] Specifically, when |H C |<1%, the current load of the burner is not adjusted; when |H C |≥1%, it is determined that the current load of the burner needs to be adjusted; if the difference H C is positive, the current load of the burner increases; if the difference H C If it is negative, the current load of the burner is reduced. Further, when increasing or decreasing the current load of the burner, the adjustment amount of the burner load is 5H C .

[0023] Step 3: The weighted average moisture content H of the aggregate T Recorded as the new standard moisture content H B+1 , calculate the weighted average H of aggregate moisture content in the next preset time period T T+1 , then calculate H T+1 With the new standard moisture content H B+1 The difference H C+1 , and according to the difference H C+1 Determine whether and how to adjust the current load of the burner.

[0024] Specifically, when |H C+1 |<1%, the current load of the burner is not adjusted; when |H C+1 |≥1%, it is determined that the current load of the burner needs to be adjusted; if the difference H C+1 is positive, the current load of the burner is increased; if the difference H C+1 If it is negative, the current load of the burner is reduced. Further, when increasing or decreasing the current load of the burner, the adjustment amount of the burner load is 5H C+1 .

[0025] Step 4: Repeat iterative calculation and burner load adjustment according to a preset time period until the asphalt mixture production is completed.

[0026] Example 2

[0027] like Figure 2 As shown, this embodiment provides a burner control system for adaptive aggregate moisture content of an asphalt station, including a conveyor belt 3, multiple silos 1, a drying drum 4, a burner 5 connected to the drying drum 4, a moisture content sensor 2 and a control mechanism 6.

[0028] The end of the conveyor belt 3 is connected to the drying drum 4. The silos 1 are arranged in sequence along the conveying direction of the conveyor belt 3. The silos 1 are used to store various aggregates. The conveyor belt 3 is used to transport the aggregates in the silos 1 to the drying drum 4 for mixed combustion. Among them, the state information and load control of the burner 5 are monitored and given by the control mechanism 6.

[0029] The moisture sensor 2 is installed on the wall of the discharge port of the silo 1. The moisture sensor 2 is used to detect the moisture content information of each aggregate. In this embodiment, the moisture sensor 2 uses a panel induction type.

[0030] The control mechanism 6 is electrically connected to the moisture sensor 2 and the burner 5, respectively, and is used to execute the burner control method for adaptive aggregate moisture content in asphalt stations described in Example 1. The control mechanism 6 includes an electrically connected programmable controller and a host computer. The programmable controller can use a PLC to obtain moisture content information of each aggregate, burner status information, asphalt mixture formula, etc., and transmit the obtained information to the host computer; it is also used to receive control commands from the host computer and control the burner to adjust the load. The host computer uses an ordinary computer. The host computer is used to receive data information sent by the programmable controller, and calculate and judge whether burner load adjustment is required based on the received data information, and send a control command to the programmable controller. If the difference between the weighted average moisture content of the aggregate in the current preset time period and the standard moisture content is too large, the host computer sends a control command to the programmable controller, and the programmable controller controls the burner to adjust the load.

[0031] Example 3

[0032] like Figure 1 As shown, this embodiment provides a burner control method for adaptive aggregate moisture content in an asphalt station based on the system described in Embodiment 2, and the steps are as follows: Aggregate moisture content detection: When the asphalt station starts production, the formula of the asphalt mixture to be produced is transmitted, and the control mechanism 6 obtains the mass proportion of each aggregate in the formula as a weight. After the burner 5 is ignited, the operator sets the current burner load, and the silo 1 starts to discharge the material. The conveyor belt 3 transports the aggregate to the drying drum 4. During the discharge process, the moisture content sensor 2 detects the moisture content information of the aggregate in each silo and sends it to the control mechanism 6.

[0033] First load adjustment judgment: The control mechanism 6 starts to calculate the weighted average value H of the aggregate moisture content within the first preset time period T (T=60s). T , and the standard moisture content H commonly used in asphalt stations B (H B =5%) to compare and calculate the difference, and the difference is recorded as H C ; If the first preset time period | H C |≥1%, according to the difference H C The control mechanism 6 issues a command to adjust the current load of the burner 5. If the difference is positive, the load is increased; if the difference is negative, the load is reduced. The adjustment amount is 5H C ; If the first preset time period | H C |<1%, no adjustment will be made and the next preset time period will be continued.

[0034] Subsequent adjustment judgment: The weighted average value H of the aggregate moisture content T Recorded as the new standard moisture content H B+1 , the control mechanism 6 calculates the weighted average water content H within the next preset time period T T+1 , and the new standard moisture content H B+1 Compare and get the new moisture content difference H C+1 , if |H C+1 |≥1%, according to the difference H C+1 The control mechanism 6 issues a command to adjust the current load of the burner 5. If the difference is positive, the load is increased; if the difference is negative, the load is reduced. The adjustment amount is 5H C+1 ; If |H C+1 |<1%, no adjustment is performed.

[0035] End of production: As time passes, the control mechanism 6 repeatedly and iteratively calculates the weighted average value of the moisture content of the aggregate and determines whether to adjust the load of the burner until the production is completed.

[0036] The burner control method and system for adaptive aggregate moisture content in an asphalt station provided by the present invention can realize that the asphalt station automatically adjusts the load of the burner according to the aggregate moisture content, reduces energy waste, improves the stability of product quality, enables the operator to clearly understand the aggregate moisture content, reduces the operator's workload, and improves production efficiency and automation.

[0037] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0038] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0039] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0040] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A burner control method for asphalt station adaptive aggregate moisture content, characterized in that: include: Obtaining moisture content information of each aggregate, and calculating a weighted average moisture content of the aggregate within a preset time period based on the moisture content information of each aggregate; Calculate the difference between the weighted average moisture content of the aggregate and the standard moisture content. If the difference is within the preset range, the current load of the burner is not adjusted. If the difference exceeds the preset range, the current load of the burner is adjusted according to the difference; Recording the weighted average of the aggregate moisture content as a new standard moisture content, calculating the difference between the weighted average of the aggregate moisture content in the next preset time period and the new standard moisture content, and judging whether and how to adjust the current load of the burner according to the difference; Repeated iterative calculation and burner load adjustment are performed according to a preset time period until the asphalt mixture production is completed.

2. The burner control method for adaptive aggregate moisture content in asphalt plant according to claim 1 is characterized in that: The step of calculating the weighted average moisture content of the aggregates within a preset time period according to the moisture content information of each aggregate includes: Get the formula of asphalt mixture; The mass proportion of each aggregate in the formula is used as the weight to calculate the weighted average moisture content of the aggregate within the preset time period.

3. The burner control method for adaptive aggregate moisture content in asphalt plant according to claim 1, characterized in that: The preset time period is the transportation time of the aggregate from the silo to the burner end.

4. The burner control method for adaptive aggregate moisture content in asphalt plant according to claim 1, characterized in that: The difference value includes within a preset range: an absolute value of the difference value is less than 1%.

5. The burner control method for adaptive aggregate moisture content in asphalt plant according to claim 1, characterized in that: If the difference exceeds the preset range, the current load of the burner is adjusted according to the difference, including: If the absolute value of the difference is ≥ 1%, it is determined that the current load of the burner needs to be adjusted; If the difference is positive, increasing the current load of the burner; If the difference is negative, the current load on the burner is reduced.

6. The burner control method for adaptive aggregate moisture content in asphalt plant according to claim 5, characterized in that: When increasing or decreasing the current load of the burner, the adjustment amount of the burner load is 5 times the difference.

7. A burner control system for asphalt plant adaptive to aggregate moisture content, characterized in that: include: Moisture content sensor, used to detect the moisture content information of each aggregate; A drying drum connected to a burner is used to mix and burn various aggregates; The control mechanism is connected to the moisture content sensor and the burner respectively, and is used to execute the burner control method for adaptive aggregate moisture content in an asphalt station as described in any one of claims 1 to 6.

8. The burner control system for adaptive aggregate moisture content in asphalt plant according to claim 7, characterized in that: It also includes a conveyor belt and a plurality of silos, wherein the silos are arranged in sequence along the conveying direction of the conveyor belt, and the silos are used to store various aggregates.

9. The burner control system for adaptive aggregate moisture content in an asphalt plant according to claim 8, characterized in that: The moisture content sensor is installed on the silo wall of the material outlet.

10. The burner control system for adaptive aggregate moisture content in asphalt plant according to claim 7, characterized in that: The control mechanism includes an electrically connected programmable controller and a host computer, wherein the host computer is used to receive data information sent by the programmable controller, calculate and judge whether burner load adjustment is required based on the received data information, and send a control command to the programmable controller.

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