A sintering combustion control system

Abstract

The application provides a sintering combustion control system, which comprises a sensor module, a calculation module and a control module, and sintering is controlled by gas flow, air flow, intensity and temperature. In the process of adjusting the thickness of sintering, flow control is selected, the opening of a gas or air adjusting valve is automatically adjusted at intervals by changing the deviation of target flow and feedback flow; in the process of stabilizing the ignition temperature of sintering, intensity control is selected, the deviation of set intensity and actual intensity calculated is set, and the value of gas flow is automatically set by calculation; when the deviation of temperature and gas flow is large, the value required by a coke oven gas adjusting valve to adjust is calculated by detecting the deviation of total gas flow and the hearth temperature of an ignition furnace, and finally the setting of the coke oven gas adjusting valve is adjusted and controlled. The sintering is controlled by gas flow, air flow, intensity and temperature, and a more accurate and reliable combustion control method is provided.

Description

Technical Field

[0001] This application relates to the field of automation control in the steel industry, and mainly to a sintering combustion control system. Background Technology

[0002] Combustion control in sintering is primarily achieved through manual adjustment or PID control. PID stands for Proportional, Integral, and Derivative, and it's a common stability control algorithm. In closed-loop system control, the PID algorithm can automatically and accurately correct the control system.

[0003] The opening of the gas regulating valve can be controlled by setting the gas flow rate and providing feedback on the gas flow rate, or by setting the gas flow rate and air-fuel ratio (i.e., setting the air flow rate) to control the opening of the air regulating valve. Although this method is simple, it is not very timely or practical. The purpose of sintering is to provide sufficient heat to ensure complete combustion of the fuel. This method may lead to incomplete combustion of the fuel, which directly affects the normal progress of sintering and the quality of the sintered ore. Summary of the Invention

[0004] To address the problem of incomplete fuel combustion caused by untimely adjustment of valve opening, this application provides a sintering combustion control system, including a sensor module, a computing module, and a control module. The sensor module is configured as follows:

[0005] The flow rate of the gas branch pipe is obtained to obtain the gas flow rate feedback value, and the gas flow rate feedback value is sent to the calculation module.

[0006] The computing module is configured as follows:

[0007] After receiving the gas flow feedback value, calculate the absolute value of the gas flow difference between the gas flow setpoint and the gas flow feedback value;

[0008] When the absolute value of the gas flow rate difference is greater than 70 Nm 3 When the gas flow rate difference is / h, divide the gas flow rate difference by 10 and multiply it by the gas flow rate fine-tuning coefficient to obtain the gas valve opening increment.

[0009] The sum of the gas valve opening increment and the gas flow rate setting value is calculated to obtain the new gas valve opening setting value, and the new gas valve opening setting value is sent to the control module.

[0010] The control module is configured as follows:

[0011] After receiving the new opening setting value of the gas valve, the output of the gas valve is adjusted according to the new opening setting value.

[0012] Optionally, the sensor module in the sintering combustion control system is further configured as follows:

[0013] After a 10-second interval, the flow rate of the gas branch pipe is retrieved again to refresh the gas flow rate feedback value, and the refreshed gas flow rate feedback value is sent to the calculation module.

[0014] Optionally, the absolute value of the gas valve opening increment is less than or equal to 0.7 Nm. 3 / h.

[0015] Optionally, the sensor module in the sintering combustion control system is further configured as follows:

[0016] Obtain the airflow feedback value and send the airflow feedback value to the calculation module;

[0017] The computing module is configured as follows:

[0018] Receive the air flow feedback value, and calculate the absolute value of the difference between the product of the gas flow setpoint and the set air-fuel ratio and the air flow feedback value to obtain the first air flow difference value;

[0019] If the first airflow difference is greater than 50 Nm 3 If the air flow rate is / h, then the difference between the air flow rate setpoint and the air flow rate feedback value is divided by 10 and multiplied by the air flow rate fine-tuning coefficient to obtain the air valve adjustment increment;

[0020] The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module.

[0021] The control module is configured as follows:

[0022] After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

[0023] Optionally, the sensor module in the sintering combustion control system is further configured as follows:

[0024] Obtain the airflow feedback value and send the airflow feedback value to the calculation module;

[0025] The computing module is configured as follows:

[0026] The absolute value of the difference between the airflow setpoint and the airflow feedback value is calculated to obtain the second airflow difference.

[0027] If the second airflow difference is greater than 50 Nm 3If the air flow rate is / h, then the difference between the air flow rate setpoint and the air flow rate feedback value is divided by 10 and multiplied by the air flow rate fine-tuning coefficient to obtain the air valve adjustment increment;

[0028] The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module.

[0029] The control module is configured as follows:

[0030] After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

[0031] Optionally, the sensor module in the sintering combustion control system is further configured as follows:

[0032] After a 10-second interval, the airflow feedback value is retrieved and refreshed, and then sent to the calculation module.

[0033] Optionally, the calculation module in the sintering combustion control system is further configured to:

[0034] Receive the gas flow feedback value, and calculate the ignition intensity feedback value by combining the gas flow feedback value, gas calorific value, sintering machine speed and sintering machine trolley width;

[0035] If the absolute value of the difference between the ignition intensity setpoint and the ignition intensity feedback value is greater than 0.7 Nm 3 If / h, then the new set value of gas flow rate is calculated by combining the ignition intensity set value, sintering machine speed, sintering machine trolley width and gas calorific value, and the value of the gas flow rate set value is updated to the value of the new set value of gas flow rate.

[0036] Optionally, the calculation module in the sintering combustion control system is further configured to:

[0037] After 20 seconds of completing one update, execute the procedure to update the gas flow rate setting value again.

[0038] Optionally, the sensor module in the sintering combustion control system is configured as follows:

[0039] Acquire and send the total flow rate of the gas branch pipe and the temperature of the left side furnace of the ignition furnace to the calculation module;

[0040] The computing module is configured as follows:

[0041] Receive the total flow rate of the gas branch pipe and the temperature of the left side furnace of the ignition furnace;

[0042] If the total flow rate of the gas branch pipe is less than 2400 Nm3 / h or greater than 2600 Nm 3 / h, and at the same time, the temperature value of the furnace chamber on the left side of the ignition furnace is greater than 500℃ and less than 1000℃ or greater than 1100℃ and less than 2000℃, then calculate the air valve adjustment increment;

[0043] The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module.

[0044] The control module is configured as follows:

[0045] After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

[0046] Optionally, the sensor module in the sintering combustion control system is further configured as follows:

[0047] Five minutes after the initial acquisition, the total flow rate of the gas branch pipe and the temperature of the left side of the ignition furnace are acquired and refreshed, and the refreshed total flow rate of the gas branch pipe and the temperature of the left side of the ignition furnace are sent to the calculation module.

[0048] This application provides a sintering combustion control system, including a sensor module, a calculation module, and a control module, which jointly controls sintering through gas flow rate, air flow rate, intensity, and temperature. When adjusting the material thickness during sintering, flow control is selected, and the opening of the gas or air regulating valve is automatically adjusted intermittently based on the deviation between the target flow rate and the feedback flow rate. When the sintering ignition temperature is stable, intensity control is selected, and the deviation between the set intensity and the calculated actual intensity is used to automatically set the gas flow rate. When the temperature and gas flow rate deviation is large, the deviation between the total gas flow rate and the furnace temperature is detected to calculate the required adjustment value of the coke oven gas regulating valve, ultimately adjusting the setting of the gas regulating valve. This application provides a more precise and reliable combustion control method by jointly controlling sintering through gas flow rate, air flow rate, intensity, and temperature. Attached Figure Description

[0049] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A schematic diagram of gas flow control in a sintering combustion control system;

[0051] Figure 2 A schematic diagram of airflow control in a sintering combustion control system;

[0052] Figure 3 A schematic diagram of ignition intensity control in a sintering combustion control system;

[0053] Figure 4 This is a schematic diagram of temperature control in a sintering combustion control system. Detailed Implementation

[0054] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0055] like Figure 1 The diagram shown illustrates the gas flow control in the sintering combustion control system (Delt_gase is the gas valve opening increment; sp_gase is the gas flow setpoint; pv_gase is the gas flow feedback value; sp_valve_gase is the new gas valve opening setpoint; K1 is the gas flow fine-tuning coefficient). Gas flow control automatically adjusts the opening of the gas regulating valve based on the gas flow setpoint and the gas flow feedback value.

[0056] When the gas branch pipe flow rate deviation is large, subtract the gas flow rate feedback value from the coke oven gas branch pipe flow rate setpoint, divide by 10 to calculate the valve increment, and multiply by the corresponding gas flow rate fine-tuning coefficient according to the actual situation to control the gas valve opening increment within ±0.7 Nm. 3 Between / h, the calculated gas valve opening increment is added to the corresponding gas flow rate setpoint output, and the valve output range is controlled between 10% and 30%. The valve position output adjustment cycle is triggered once every 10 seconds.

[0057] In some embodiments, the sensor module is configured to: acquire the flow rate value of the gas branch pipe to obtain a gas flow feedback value, and send the gas flow feedback value to the calculation module. The calculation module is configured to: after receiving the gas flow feedback value, calculate the absolute value of the gas flow difference between the gas flow setpoint and the gas flow feedback value; when the absolute value of the gas flow difference is greater than 70 Nm... 3 At a rate of / h, the gas flow rate difference is divided by 10 and multiplied by a gas flow rate fine-tuning coefficient to obtain the gas valve opening increment. The sum of the gas valve opening increment and the gas flow rate setpoint is calculated to obtain the new gas valve opening setpoint, which is then sent to the control module. The control module is configured to adjust the gas valve output according to the new gas valve opening setpoint after receiving it.

[0058] After a 10-second acquisition period, the sensor module reacquires the gas flow rate of the gas branch pipe, refreshes the gas flow rate feedback value, and sends the refreshed gas flow rate feedback value to the calculation module. The absolute value of the gas valve opening increment is less than or equal to 0.7 Nm. 3 / h.

[0059] like Figure 2 The diagram shown illustrates airflow control in a sintering combustion control system (Delt_aire is the air valve adjustment increment; sp_aire is the airflow setpoint; pv_aire is the airflow feedback value; sp_valve_aire is the new air valve opening setpoint; nPortion is the set air-fuel ratio; K2 is the airflow fine-tuning coefficient). Airflow control automatically adjusts the air valve opening based on the airflow setpoint and airflow feedback value, or calculates the airflow setpoint based on the gas flow setpoint and set air-fuel ratio to adjust the air valve opening.

[0060] When the air flow deviation is large, subtract the air flow feedback value from the air flow setpoint; or after setting the air-fuel ratio, multiply the gas flow setpoint by the set air-fuel ratio, subtract the air flow feedback value, divide by 10 to calculate the valve increment, and multiply by the corresponding air flow fine-tuning coefficient according to the actual situation to control the valve opening increment within ±1.5 Nm. 3 Between / h, the calculated air valve adjustment increment is added to the corresponding air flow setpoint output, and the valve output range is controlled between 28% and 50%. The valve position output adjustment cycle is triggered once every 10 seconds.

[0061] In some embodiments, the sensor module is configured to: acquire an air flow feedback value and send the air flow feedback value to a calculation module. The calculation module is configured to: receive the air flow feedback value and calculate the absolute value of the difference between the product of the gas flow setpoint and the set air-fuel ratio and the air flow feedback value, to obtain a first air flow difference; if the first air flow difference is greater than 50 Nm... 3 If the airflow rate is / h, then the difference between the airflow setpoint and the airflow feedback value is divided by 10, and then multiplied by the airflow fine-tuning coefficient to obtain the air valve adjustment increment; the sum of the air valve adjustment increment and the airflow setpoint is calculated to obtain the air valve new opening setpoint, and the air valve new opening setpoint is sent to the control module. The control module is configured to: after receiving the air valve new opening setpoint, adjust the air valve output according to the air valve new opening setpoint.

[0062] In some embodiments, the sensor module is configured to: acquire an airflow feedback value and send the airflow feedback value to a calculation module. The calculation module is configured to: calculate the absolute value of the difference between an airflow setpoint and the airflow feedback value to obtain a second airflow difference; if the second airflow difference is greater than 50 Nm... 3 If the airflow rate is / h, then the difference between the airflow setpoint and the airflow feedback value is divided by 10, and then multiplied by the airflow fine-tuning coefficient to obtain the air valve adjustment increment; the sum of the air valve adjustment increment and the airflow setpoint is calculated to obtain the air valve new opening setpoint, and the air valve new opening setpoint is sent to the control module. The control module is configured to: after receiving the air valve new opening setpoint, adjust the air valve output according to the air valve new opening setpoint.

[0063] In some embodiments, after 10 seconds of acquisition, the sensor module reacquires and refreshes the airflow feedback value, and sends the refreshed airflow feedback value to the calculation module.

[0064] like Figure 3 The diagram shown illustrates the ignition intensity control in the sintering combustion control system (Fire_intensity_pv is the ignition intensity feedback value; Fire_intensity_sp is the ignition intensity setpoint; pv_gase is the gas flow feedback value; sp_flow_gase is the new gas flow setpoint; ca is the gas calorific value; speed_sm is the sintering machine speed (m / min); width_troiley is the sintering machine trolley width). Intensity control is based on the deviation between the ignition intensity setpoint and the calculated ignition intensity feedback value. The gas flow setpoint is automatically updated through calculation.

[0065] Calculation of ignition intensity feedback value: Multiply the coke oven gas branch pipe flow rate by the gas calorific value, divide by the sintering machine speed (m / min), divide by 60 (m / s), and multiply by the sintering machine trolley width. When the ignition intensity deviation is large, multiply the ignition intensity setpoint by the sintering machine speed, multiply by the trolley width, divide by the gas calorific value, multiply by 60 (converted to seconds), calculate the new gas flow rate setpoint, and assign it. The output range is limited to 800 Nm. 3 / h to 1600Nm 3 The gas flow rate adjustment cycle is triggered every 20 seconds.

[0066] In some embodiments, the calculation module is further configured to: receive the gas flow feedback value, and calculate an ignition intensity feedback value by combining the gas flow feedback value, the gas calorific value, the sintering machine speed, and the sintering machine trolley width; if the absolute value of the difference between the ignition intensity setpoint and the ignition intensity feedback value is greater than 0.7 Nm 3If the value is / h, then a new gas flow rate setting is calculated based on the ignition intensity setting, sintering machine speed, sintering machine trolley width, and gas calorific value. The new gas flow rate setting is then updated to this new value. After 20 seconds of this update, the procedure for updating the gas flow rate setting is executed again.

[0067] like Figure 4 The diagram shown is a temperature control schematic in the sintering combustion control system (flow_gase is the total flow rate of the gas branch pipe; Tfire is the temperature of the furnace on the left side of the ignition furnace; Taim is the ignition temperature setpoint; delt_aire is the air valve adjustment increment; sp_valve_aire is the air valve new opening setpoint; pv_valve_gase_ease is the gas regulating valve position feedback east; pv_valve_gase_west is the gas regulating valve position feedback west).

[0068] In some embodiments, when the total flow rate of the coke oven gas branch pipe is less than 2400 Nm 3 / h or greater than 2600 Nm 3 When the temperature in the left side of the ignition furnace is greater than 500℃ but less than 1000℃, or greater than 1100℃ but less than 2000℃, it can be determined that the temperature deviation is large. Using the average value of the feedback from the two coke oven gas flow valve positions as a basis, the set furnace temperature is divided by this basis to calculate the temperature corresponding to each unit opening degree. The ignition temperature setpoint is subtracted from the left side furnace temperature value and then divided by the temperature corresponding to each unit opening degree to obtain the value that the regulating valve needs to adjust. When the conditions are met, this adjustment value is added to the valve position setting of the gas branch pipe regulating valve and output. The valve position output adjustment cycle is triggered once every 5 minutes.

[0069] This application provides a sintering combustion control system, including a sensor module, a calculation module, and a control module, which jointly controls sintering through gas flow rate, air flow rate, intensity, and temperature. When adjusting the material thickness during sintering, flow control is selected, and the opening of the gas or air regulating valve is automatically adjusted intermittently based on the deviation between the target flow rate and the feedback flow rate. When the sintering ignition temperature is stable, intensity control is selected, and the deviation between the set intensity and the calculated actual intensity is used to automatically set the gas flow rate. When the temperature and gas flow rate deviation is large, the deviation between the total gas flow rate and the furnace temperature is detected to calculate the required adjustment value of the coke oven gas regulating valve, ultimately adjusting the setting of the gas regulating valve. This application provides a more precise and reliable combustion control method by jointly controlling sintering through gas flow rate, air flow rate, intensity, and temperature.

[0070] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A sintering combustion control system, characterized in that, It includes a sensor module, a computing module, and a control module, wherein the sensor module is configured as follows: The flow rate of the gas branch pipe is obtained to obtain the gas flow rate feedback value, and the gas flow rate feedback value is sent to the calculation module. The computing module is configured as follows: After receiving the gas flow feedback value, calculate the absolute value of the gas flow difference between the gas flow setpoint and the gas flow feedback value; When the absolute value of the gas flow rate difference is greater than 70 Nm 3 When the gas flow rate difference is / h, divide the gas flow rate difference by 10 and multiply it by the gas flow rate fine-tuning coefficient to obtain the gas valve opening increment. The sum of the gas valve opening increment and the gas flow rate setting value is calculated to obtain the new gas valve opening setting value, and the new gas valve opening setting value is sent to the control module. The control module is configured as follows: After receiving the new opening setting value of the gas valve, the output of the gas valve is adjusted according to the new opening setting value.

2. The sintering combustion control system according to claim 1, characterized in that, The sensor module is also configured to: After a 10-second interval, the flow rate of the gas branch pipe is retrieved again to refresh the gas flow rate feedback value, and the refreshed gas flow rate feedback value is sent to the calculation module.

3. The sintering combustion control system according to claim 2, characterized in that, The absolute value of the gas valve opening increment is less than or equal to 0.7 Nm. 3 / h.

4. The sintering combustion control system according to claim 3, characterized in that, The sensor module is also configured to: Obtain the airflow feedback value and send the airflow feedback value to the calculation module; The computing module is configured as follows: Receive the air flow feedback value, and calculate the absolute value of the difference between the product of the gas flow setpoint and the set air-fuel ratio and the air flow feedback value to obtain the first air flow difference value; If the first airflow difference is greater than 50 Nm 3 If the air flow rate is / h, then the difference between the air flow rate setpoint and the air flow rate feedback value is divided by 10 and multiplied by the air flow rate fine-tuning coefficient to obtain the air valve adjustment increment; The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module. The control module is configured as follows: After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

5. The sintering combustion control system according to claim 3, characterized in that, The sensor module is also configured to: Obtain the airflow feedback value and send the airflow feedback value to the calculation module; The computing module is configured as follows: The absolute value of the difference between the airflow setpoint and the airflow feedback value is calculated to obtain the second airflow difference. If the second airflow difference is greater than 50 Nm 3 If the air flow rate is / h, then the difference between the air flow rate setpoint and the air flow rate feedback value is divided by 10 and multiplied by the air flow rate fine-tuning coefficient to obtain the air valve adjustment increment; The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module. The control module is configured as follows: After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

6. The sintering combustion control system according to claim 4 or 5, characterized in that, The sensor module is also configured to: After a 10-second interval, the airflow feedback value is retrieved and refreshed, and then sent to the calculation module.

7. The sintering combustion control system according to claim 6, characterized in that, The computing module is also configured to: Receive the gas flow feedback value, and calculate the ignition intensity feedback value by combining the gas flow feedback value, gas calorific value, sintering machine speed and sintering machine trolley width; If the absolute value of the difference between the ignition intensity setpoint and the ignition intensity feedback value is greater than 0.7 Nm 3 If / h, then the new set value of gas flow rate is calculated by combining the ignition intensity set value, sintering machine speed, sintering machine trolley width and gas calorific value, and the value of the gas flow rate set value is updated to the value of the new set value of gas flow rate.

8. The sintering combustion control system according to claim 7, characterized in that, The computing module is also configured to: After 20 seconds of completing one update, execute the procedure to update the gas flow rate setting value again.

9. The sintering combustion control system according to claim 8, characterized in that, The sensor module is configured as follows: Acquire and send the total flow rate of the gas branch pipe and the temperature of the left side furnace of the ignition furnace to the calculation module; The computing module is configured as follows: Receive the total flow rate of the gas branch pipe and the temperature of the left side furnace of the ignition furnace; If the total flow rate of the gas branch pipe is less than 2400 Nm 3 / h or greater than 2600 Nm 3 / h, and at the same time, the temperature value of the furnace chamber on the left side of the ignition furnace is greater than 500℃ and less than 1000℃ or greater than 1100℃ and less than 2000℃, then calculate the air valve adjustment increment; The sum of the air valve adjustment increment and the air flow setpoint is calculated to obtain the new air valve opening setpoint, and the new air valve opening setpoint is sent to the control module. The control module is configured as follows: After receiving the new opening setting value of the air valve, the output of the air valve is adjusted according to the new opening setting value.

10. The sintering combustion control system according to claim 9, characterized in that, The sensor module is also configured to: Five minutes after the initial acquisition, the total flow rate of the gas branch pipe and the temperature of the left side of the ignition furnace are acquired and refreshed, and the refreshed total flow rate of the gas branch pipe and the temperature of the left side of the ignition furnace are sent to the calculation module.

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