Method and system for measuring powder flow based on current value of elevator

Abstract

The invention relates to the field of measurement and control, in particular to a powder flow measurement method and system based on the current value of an elevator. The method comprises the following steps: a controller calculates a powder flow value by using the following formula: when the deviation is greater than a deviation threshold value, the powder flow value is a calculated value; when the deviation is not larger than the deviation threshold value, the powder flow value is a direct measurement value. When the numerical value of the metering scale drifts, a process operator can timely find that the measured value of the powder flow is unstable through deviation alarm prompt, and the controller automatically selects the calculated value of the powder flow as the final powder flow numerical value to serve as the actual flow of the materials discharged from the mill or fed into the kiln, so that the metering accuracy of the materials discharged from the mill or fed into the kiln is ensured; key calculation data is provided for improving the product yield and quality and reducing energy consumption, and economic losses are avoided.

Description

Technical Field

[0001] The invention relates to the field of measurement and control, and in particular to a powder flow measurement method and system based on a hoist current value. Background Art

[0002] The flow rate feedback of powder materials out of the mill or into the kiln in medium and large-scale dry cement plants is the main parameter basis for the entire process production operation. At present, large and medium-sized dry cement plants usually use equipment such as metering scales or flow meters to achieve automatic metering and feeding of powder materials in the process of feeding powder materials out of the mill or into the kiln.

[0003] However, in actual production, the feedback values ​​of these metering devices may occasionally fail or drift inaccurately, leading to the following problems: 1) Process operators are unable to detect problems in a timely manner: When the value of the feed scale drifts, the operator cannot intuitively detect the problem, which may lead to misoperation and production losses. 2) Production shutdown and recalibration: Serious failure of the metering scale may cause the factory to shut down and require the metering scale to be recalibrated, causing great economic losses to the company. 3) Impact on the operation of intelligent systems: With the increasing application of factory intelligent systems, material flow feedback is the main calculation parameter of the entire production intelligent system. The correctness of this parameter determines the commissioning rate and intelligent optimization results of the intelligent system, affecting the optimal production indicators.

[0004] In the existing technology, material flow feedback mainly relies on equipment such as metering scales or punching scales, which has the following shortcomings: 1) Insufficient reliability: metering equipment is prone to failure or feedback drift, resulting in inaccurate feedback data. 2) Lack of real-time correction: The existing technology lacks a real-time correction mechanism for the feedback data of metering equipment, and cannot detect and correct errors in time. 3) Impact on the efficiency of the intelligent system: Inaccurate material flow feedback will affect the operating efficiency and optimization effect of the intelligent system. Summary of the invention

[0005] In view of the above problems, the present invention proposes the following technical solutions:

[0006] The present invention provides a powder flow measurement method based on the current value of an elevator, which is applied to a powder conveying system. The powder conveying system comprises: an elevator for conveying powder; a flow measurement device for obtaining a direct flow measurement value of the powder; and a controller for obtaining a powder flow value according to the elevator current and the flow measurement value of the powder. The method comprises the following steps:

[0007] The controller calculates the powder flow value using the following formula:

[0008] when When F = F w

[0009] when When F = F e

[0010] Where, F is the powder flow value; c is the deviation threshold;

[0011] F w It is the direct measurement value of the powder flow rate obtained by using the flow measurement equipment;

[0012] F e It is the calculated value of powder flow rate obtained according to the current of the hoist;

[0013] F e The calculation formula is:

[0014] F e =a e ×I e +b e

[0015] Among them, I e is the hoisting machine current; a e is the proportionality coefficient; b e is the offset coefficient;

[0016] a e 、b e Through multiple groups I e And the corresponding powder flow calibration value is fitted.

[0017] Preferably, when When the flow measurement device is recalibrated, the controller will also send an alarm to the user, prompting the user to recalibrate the flow measurement device.

[0018] Preferably, the value of c is 15%.

[0019] Preferably, the flow measurement device comprises a metering scale or a flow meter.

[0020] The present invention also provides a powder conveying system, characterized in that the powder flow value is measured using the method described in any one of claims 1 to 4.

[0021] Beneficial effect: When the value of the weighing scale drifts, the process operator can promptly discover the instability of the measured value of the powder flow rate through the deviation alarm prompt. The controller automatically selects the calculated value of the powder flow rate as the final powder flow rate value as the actual flow rate of the material entering the kiln, ensuring the accuracy of the metering of the material entering the kiln, providing key calculation data for improving the output and quality of clinker and reducing energy consumption, thereby avoiding economic losses. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described below 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.

[0023] A powder flow measurement method based on the current value of an elevator is applied to a powder conveying system, wherein the powder conveying system comprises: an elevator for conveying powder; a flow measurement device for obtaining a direct flow measurement value of the powder; and a controller for obtaining a powder flow value according to the elevator current and the flow measurement value of the powder. The method comprises the following steps:

[0024] The controller calculates the powder flow value using the following formula:

[0025] when When F = F w

[0026] when When F = F e

[0027] Where, F is the powder flow value; c is the deviation threshold;

[0028] F w is a direct measurement value of the flow rate of the powder obtained using a flow measurement device; in this embodiment, the flow measurement device includes a metering scale or a flow meter;

[0029] F e It is the calculated value of powder flow rate obtained according to the current of the hoist;

[0030] F e The calculation formula is:

[0031] F e =a e ×I e +b e

[0032] Among them, I e is the hoisting machine current; a e is the proportionality coefficient; b e is the offset coefficient;

[0033] a e 、b e Through multiple groups I e And the corresponding powder flow calibration value is fitted.

[0034] In this embodiment, the value of c is 15%; when When the flow measurement device is recalibrated, the controller will also send an alarm to the user, prompting the user to recalibrate the flow measurement device.

[0035] During the powder transportation process, the present invention approximately considers the relationship between the powder flow rate and the elevator current to be a linear relationship, and calculates the powder flow rate by the elevator current. When the calculated value of the powder flow rate deviates too much from the measured value, the calculated value is used instead of the measured value to ensure the accuracy of the flow rate, and at the same time, an alarm is issued to the user, prompting the user to recalibrate the flow measurement equipment.

[0036] 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A powder flow measurement method based on the current value of the hoist, applied to the powder conveying system, characterized in that: The powder conveying system comprises: an elevator for conveying powder; a flow measurement device for obtaining a direct measurement value of the flow of powder; a controller for obtaining a powder flow value according to the elevator current and the flow measurement value of the powder; and the method comprises the following steps: The controller calculates the powder flow value using the following formula: when When F = F w when When F = F e Where, F is the powder flow value; c is the deviation threshold; F w It is the direct measurement value of the powder flow rate obtained by using the flow measurement equipment; F e It is the calculated value of powder flow rate obtained according to the current of the hoist; F e The calculation formula is: F e =a e ×I e +b e Among them, I e is the hoisting machine current; a e is the proportionality coefficient; b e is the offset coefficient; a e 、b e Through multiple groups I e And the corresponding powder flow calibration value is fitted.

2. A powder flow measurement method based on the current value of the hoist according to claim 1, characterized in that: when When the flow measurement device is recalibrated, the controller will also send an alarm to the user, prompting the user to recalibrate the flow measurement device.

3. The powder flow measurement method based on the current value of the hoist according to claim 1 is characterized in that: The value of c is 15%.

4. The powder flow measurement method based on the current value of the hoist according to claim 1 is characterized in that: Flow measurement equipment includes metering scales or flow meters.

5. A powder conveying system, characterized in that The powder flow value is measured using the method described in any one of claims 1 to 4.

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