A method for automatically increasing and decreasing speed of steelmaking dust collector

Abstract

The present invention discloses a method for automatically increasing and decreasing the speed of a steelmaking dust collector, which relates to automatic control technology. All dust removal user points in a steelmaking area are combined and matched to form multiple dust removal zones; the dust removal fan with the largest rated air volume in the dust removal zone is selected as the main dust removal fan, and the remaining fans are selected as auxiliary dust removal fans; the real-time valve opening of the dust removal valve corresponding to the main dust removal fan is obtained, and the real-time speed of the main dust removal fan is calculated based on the proportional relationship between the real-time valve opening, the maximum valve opening of the dust removal valve, and the rated speed of the main dust removal fan at the rated air volume; the actual speed of the auxiliary dust removal fan is obtained, and the real-time speed of the auxiliary dust removal fan is calculated based on the proportional relationship between the actual speed, the real-time speed of the main dust removal fan, and the rated speed. The present invention meets environmental protection requirements, reduces electricity waste, and at the same time reduces the labor intensity of employees and even the probability of erroneous operation, thereby reducing the complexity of the system and being effective and reliable.

Description

Technical Field

[0001] The present invention relates to automatic control technology, and more particularly to an automatic speed-up and speed-down control method for a steelmaking dust collector. Background Art

[0002] Throughout the steelmaking process, many pieces of equipment within the steelmaking area operate intermittently. To comply with environmental regulations, many pieces of equipment are equipped with dust collection points to collect dust and ensure a clean, low-dust air environment. Due to the operational characteristics of these pieces of equipment, these dust collection points are not designed to operate continuously. Current dust collection systems only open the dust collection valve when the equipment is started and close it when the equipment is not in use. However, because the dust collection fan is not linked to the dust collection valve, the fan speed is not automatically controlled by the valve opening and closing. Instead, personnel on duty must notify the dust collection fan operator to manually adjust the fan speed. This not only increases employee workload but also leads to energy waste due to untimely operation or notification. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the existing technology and provide a method for automatically raising and lowering the speed of a steelmaking dust collector, which meets environmental protection requirements, reduces the labor intensity of employees and even the probability of erroneous operation.

[0004] The method for automatically increasing and decreasing the speed of a steelmaking dust collector disclosed in the present invention measures the air volume at all dust removal user points in a steelmaking area to obtain the rated air volume of each dust removal user point; and combines and matches all the rated air volumes to form multiple dust removal zones.

[0005] The dust removal fan with the largest rated air volume in the dust removal area is taken as the main dust removal fan, and the remaining dust removal fans in the dust removal area are taken as auxiliary dust removal fans;

[0006] Obtaining a real-time valve opening of a dust removal valve corresponding to the main dust removal fan, and calculating the real-time speed of the main dust removal fan according to a proportional relationship between the real-time valve opening, the maximum valve opening of the dust removal valve, and the rated speed of the main dust removal fan at the rated air volume;

[0007] Obtain the actual speed of the auxiliary dust removal fan before the main dust removal fan valve is adjusted, and calculate the real-time speed 2 of the auxiliary dust removal fan based on the proportional relationship between the actual speed, the real-time speed 1 of the main dust removal fan and the rated speed.

[0008] The sum of the rated air volumes of all the dust removal fans in each of the dust removal zones is the same.

[0009] Preset a minimum speed threshold; determine the magnitude relationship between the second real-time speed and the minimum speed threshold;

[0010] If the real-time speed 2 is greater than the minimum speed threshold, the auxiliary dust removal fan operates at the real-time speed 2;

[0011] If the second real-time speed is equal to or less than the minimum speed threshold, the auxiliary dust removal fan stops rotating.

[0012] If the auxiliary dust removal fan stops rotating, the dust removal valve corresponding to the auxiliary dust removal fan is closed.

[0013] The valve opening of the dust removal valve corresponding to the auxiliary dust removal fan is determined according to the proportional relationship between the maximum valve opening of the dust removal valve and the rated speed and real-time speed of the auxiliary dust removal fan.

[0014] Beneficial effects

[0015] The advantages of the present invention are that the dust removal fans in the area are divided into zones, and the rotation speed of the main dust removal fan is interlocked with the valve state of the dust removal valve, as well as the main and auxiliary dust removal fans. The dust removal fan rotation speed can be automatically adjusted according to the actual switch state of the valve, thereby ultimately realizing the automatic speed control function of the dust removal fan, thereby achieving the optimal matching of air volume and fan speed. This not only meets environmental protection requirements, but also reduces electricity waste, and at the same time reduces the labor intensity of employees and even the probability of misoperation, reducing the complexity of the system, and is effective and reliable. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the embodiments, but this does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0017] The present invention provides a method for automatically increasing and decreasing the speed of a steelmaking dust collector. This method measures air volume at all dust removal user points within a steelmaking area to obtain the rated air volume for each point. All rated air volumes are combined and matched to form multiple dust removal zones, ensuring that the sum of the rated air volumes of all dust removal fans in each zone is the same. This division of dust removal zones ensures consistent dust removal capacity within each zone within the steelmaking area, facilitating dust removal and preventing overload of the dust removal system within a particular zone due to excessive dust removal capacity.

[0018] The dust removal fan with the largest rated air volume in the dust removal area is selected as the main dust removal fan, and the remaining dust removal fans in the dust removal area are selected as auxiliary dust removal fans. However, if the rated air volumes of all dust removal fans in the dust removal area are similar and the error in their rated air volumes does not exceed 10%, the dust removal fan closest to the area with the largest dust volume can be selected as the main dust removal fan to ensure the reliability of dust removal.

[0019] Get the real-time valve opening R of the dust removal valve corresponding to the main dust removal fan 11 , according to the real-time valve opening R 12 The maximum valve opening R of the dust removal valve 11 , Rated speed of main dust removal fan at rated air volume N 11 The real-time speed of the main dust removal fan is calculated by the proportional relationship between 12 That is, N 12 =N 11 ×R 12 / R 11 This setup interlocks the main dust removal fan's speed with the dust removal valve's status, automatically adjusting the fan's speed based on the valve's actual on / off status. This ultimately enables automatic speed control of the main dust removal fan, achieving the optimal match between air volume and fan speed. This not only meets environmental requirements, but also reduces electricity waste, alleviates employee workload, and even reduces the likelihood of misoperation.

[0020] Get the actual speed N of the auxiliary dust removal fan before the main dust removal fan valve is adjusted 21 , according to the actual speed N 21 , the real-time speed of the main dust removal fan is -N 12 and rated speed N 11 Calculate the real-time speed of the auxiliary dust removal fan by the proportional relationship between 22 That is, N 22 =N 21 ×N 12 / N 11 Through such a setting, the interlocking control function of the main and auxiliary dust removal fans is realized, and the auxiliary dust removal fan does not need additional independent control, which reduces the complexity of the dust removal system and is effective and reliable.

[0021] It should be noted that under normal working conditions, the speed of each dust removal fan is not completely consistent, and the speed of the auxiliary dust removal fan is generally lower than that of the main dust removal fan. Therefore, the above calculation of the real-time speed of the auxiliary dust removal fan is N. 22 The actual speed N of the auxiliary dust removal fan before the main dust removal fan valve is adjusted 21 , which can effectively prevent the problem of the main and auxiliary dust removal fans having the same speed after speed regulation.

[0022] The real-time valve opening of the auxiliary dust removal fan R 22 The maximum valve opening R of the dust removal valve corresponding to the auxiliary dust removal fan can be used. 21 The rated speed N of the auxiliary dust removal fan 20 and real-time speed N 22 The proportional relationship between them is determined. 22 =N22 ×R 21 / N 20 .

[0023] To prevent the auxiliary dust removal fan from rotating at too low a speed, effectively preventing dust removal, the present invention presets a minimum speed threshold. The relationship between the real-time speed 2 and the minimum speed threshold is determined. Specifically, if the real-time speed 2 is greater than the minimum speed threshold, the auxiliary dust removal fan operates at the real-time speed 2. If the real-time speed 2 is equal to or less than the minimum speed threshold, the auxiliary dust removal fan stops. If the auxiliary dust removal fan stops, the dust removal valve corresponding to the auxiliary dust removal fan closes.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for automatically increasing and decreasing the speed of a steelmaking dust collector, characterized in that: Measuring the air volume of all dust removal user points in the steelmaking area to obtain the rated air volume of each dust removal user point; combining and matching all the rated air volumes to form multiple dust removal zones; The dust removal fan with the largest rated air volume in the dust removal area is taken as the main dust removal fan, and the remaining dust removal fans in the dust removal area are taken as auxiliary dust removal fans; The real-time valve opening of the dust removal valve corresponding to the main dust removal fan is obtained, and the real-time speed of the main dust removal fan is calculated based on the proportional relationship between the real-time valve opening, the maximum valve opening of the dust removal valve, and the rated speed of the main dust removal fan at the rated air volume. The calculation formula is: N 12 =N 11 ×R 12 / R 11 , Where N 12 The real-time speed of the main dust removal fan is R 12 is the real-time valve opening, R 11 is the maximum valve opening of the dust removal valve, N 11 The rated speed of the main dust removal fan at the rated air volume; The actual speed of the auxiliary dust removal fan before the main dust removal fan valve is adjusted is obtained, and the real-time speed 2 of the auxiliary dust removal fan is calculated according to the proportional relationship between the actual speed, the real-time speed 1 of the main dust removal fan, and the rated speed. The calculation formula is: N 22 =N 21 ×N 12 / N 11 , Where N 22 is the real-time speed of the auxiliary dust removal fan, N 21 It is the actual speed of the auxiliary dust removal fan before the main dust removal fan valve is adjusted.

2. The method for automatically increasing and decreasing the speed of a steelmaking dust collector according to claim 1, wherein: The sum of the rated air volumes of all the dust removal fans in each of the dust removal zones is the same.

3. The method for automatically increasing and decreasing the speed of a steelmaking dust collector according to claim 1, characterized in that: Preset a minimum speed threshold; determine the magnitude relationship between the second real-time speed and the minimum speed threshold; If the real-time speed 2 is greater than the minimum speed threshold, the auxiliary dust removal fan operates at the real-time speed 2; If the second real-time speed is equal to or less than the minimum speed threshold, the auxiliary dust removal fan stops rotating.

4. The method for automatically increasing and decreasing the speed of a steelmaking dust collector according to claim 3, wherein: If the auxiliary dust removal fan stops rotating, the dust removal valve corresponding to the auxiliary dust removal fan is closed.

5. A method for automatically increasing and decreasing the speed of a steelmaking dust collector according to claim 1 or 3, characterized in that: The valve opening of the dust removal valve corresponding to the auxiliary dust removal fan is determined according to the proportional relationship between the maximum valve opening of the dust removal valve and the rated speed and real-time speed of the auxiliary dust removal fan.