Automatic temperature control method for blast furnace pulverizing system

Abstract

The present application relates to iron-making blast furnace metallurgical technology field, especially a kind of blast furnace powder system temperature automatic control method, comprising the following steps: step one, according to whether the inlet temperature of mill, mill outlet temperature exceeds upper limit, adjust flue gas furnace gas flow set value;Step two, flue gas furnace air regulating valve automatic control, according to gas regulating valve flow set value and set air-fuel ratio calculation air regulating valve air flow set value;Step three, coal feeder coal supply amount automatic control.The present application when gas pressure, calorific value change, or raw coal composition change leads to mill inlet and outlet temperature change, automatically adjust flue gas furnace gas flow, air flow and coal feeder coal supply amount, control mill inlet and outlet temperature, reach the goal of system temperature stable, suitable for wide promotion.

Description

Technical Field

[0001] This invention relates to the field of blast furnace metallurgical technology, and in particular to an automatic temperature control method for a blast furnace pulverizing system. Background Technology

[0002] Currently, blast furnace pulverized coal injection systems are operated manually via computer screens. When the composition of raw coal, gas pressure, gas calorific value, and exhaust gas temperature change, the system temperature fluctuates. This necessitates manual adjustment of gas and air regulating valve openings, as well as coal feed rates, to control the pulverizing system temperature. This existing method, requiring constant manual adjustment of these valves, increases the operator's workload. Furthermore, the varying operating habits and inherent uncertainties among operators lead to significant temperature fluctuations, ultimately affecting the quality of the pulverized coal.

[0003] Therefore, the technical problem that needs to be solved is to have an automatic temperature control method for a blast furnace pulverizing system that can automatically adjust the flow rate of flue gas, air, and coal feeder, and can control the temperature of the pulverizing system to be stable. Summary of the Invention

[0004] The present invention proposes an automatic temperature control method for a blast furnace pulverizing system, which can automatically adjust the flow rate of flue gas, air flow rate and coal feed rate of the coal feeder, control the temperature of the pulverizing system to be stable, improve the quality of pulverized coal, reduce the manpower burden, and solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic temperature control method for a blast furnace pulverizing system includes the following parameter settings: KRB_SV is the set air-fuel ratio;

[0007] KRB_PV is the actual random ratio;

[0008] MQ_QT_SV is the gas flow regulating valve for coal gas.

[0009] Flow rate setting;

[0010] MQ_QT_Q1 represents the amount of gas flow that is increased or decreased each time;

[0011] T1 is the time interval between each increase or decrease in gas flow rate;

[0012] KQ_QT_SV is the set value for the gas flow rate of the air flow regulating valve;

[0013] MM_RK_TT is the mill inlet temperature;

[0014] MM_RK_TT_H is the upper limit of the mill inlet temperature;

[0015] MM_RK_TT_L is the lower limit of the mill inlet temperature;

[0016] MM_CK_TT is the mill outlet temperature;

[0017] MM_CK_TT_SV is the setpoint for the mill outlet temperature;

[0018] MM_CK_TT_HHH represents the upper limit of the mill outlet temperature;

[0019] MM_CK_TT_HH represents the upper limit of the mill outlet temperature;

[0020] MM_CK_TT_H represents the upper limit of the mill outlet temperature;

[0021] MM_CK_TT_L is the lower limit of the mill outlet temperature;

[0022] MM_CK_TT_LL represents the lower and upper limits of the mill outlet temperature;

[0023] MM_CK_TT_LLL represents the lower and upper limits of the mill outlet temperature;

[0024] GMJ_SV is the set value for the coal feeder;

[0025] GMJ_SP1 represents a single increment or decrement of 1 for the coal feeder;

[0026] GMJ_SP2 represents the single increment / decrement value of 2 for the coal feeder;

[0027] T2 is the time interval between each increase or decrease in the coal feeder's feed rate;

[0028] It also includes the following steps:

[0029] Step 1: Adjust the flue gas flow rate setpoint based on the mill inlet temperature and mill outlet temperature.

[0030] When MM_RK_TT ≥ MM_RK_TT_H and MM_CK_TT ≥ MM_CK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_RK_TT... <MM_RK_TT_H;

[0031] When MM_CK_TT ≥ MM_CK_TT_H and MM_RK_TT ≥ MM_RK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_CK_TT... <MM_CK_TT_H;

[0032] When MM_RK_TT≤MM_RK_TT_L and MM_CK_TT≤MM_CK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After that, after every delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified to continue reducing the gas quantity until MM_RK_TT>MM_RK_TT_L.

[0033] When MM_CK_TT≤MM_CK_TT_L and MM_RK_TT≤MM_RK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After each delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified to continue reducing the gas quantity until MM_CK_TT>MM_CK_TT_L.

[0034] The gas regulating valve automatically adjusts its opening degree according to the set flow rate MQ_QT_SV using PID control.

[0035] Step 2: Automatic control of the flue gas furnace air regulating valve. The air flow setting value of the air regulating valve is calculated based on the gas regulating valve flow setting value and the set air-fuel ratio.

[0036] KQ_QT_SV = MQ_QT_SV * KRB_SV;

[0037] The flue gas furnace air flow rate KQ_QT_SV is automatically adjusted by PID control to regulate the valve opening.

[0038] Step 3: Automatic control of coal feed rate by the coal feeder;

[0039] When MM_CK_TT≥MM_CK_TT_HH, GMJ_SV= GMJ_SV + GMJ_SP1, increasing a total of 3 times, with an interval of T2 each time;

[0040] When MM_CK_TT≥MM_CK_TT_HHH, GMJ_SV= GMJ_SV + GMJ_SP2. If the mill outlet temperature continues to rise, GMJ_SV= GMJ_SV + GMJ_SP2 will be executed once every 2℃ increase in MM_CK_TT.

[0041] The beneficial effects of this invention are:

[0042] When changes in gas pressure, calorific value, or raw coal composition cause changes in the mill inlet and outlet temperatures, this invention automatically adjusts the flue gas flow rate, air flow rate, and coal feed rate to control the mill inlet and outlet temperatures and achieve a stable system temperature.

[0043] This invention can automatically adjust the flow rate of flue gas furnace gas, air flow rate and coal feeder, control the temperature of the pulverizing system to be stable, improve the quality of pulverized coal, and reduce the burden of manpower. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] Reference Figure 1 An automatic temperature control method for a blast furnace pulverizing system includes the following parameter settings: KRB_SV is the set air-fuel ratio;

[0047] KRB_PV is the actual random ratio;

[0048] MQ_QT_SV is the gas flow regulating valve for coal gas.

[0049] Flow rate setting;

[0050] MQ_QT_Q1 represents the amount of gas flow that is increased or decreased each time;

[0051] T1 is the time interval between each increase or decrease in gas flow rate;

[0052] KQ_QT_SV is the set value for the gas flow rate of the air flow regulating valve;

[0053] MM_RK_TT is the mill inlet temperature;

[0054] MM_RK_TT_H is the upper limit of the mill inlet temperature;

[0055] MM_RK_TT_L is the lower limit of the mill inlet temperature;

[0056] MM_CK_TT is the mill outlet temperature;

[0057] MM_CK_TT_SV is the setpoint for the mill outlet temperature;

[0058] MM_CK_TT_HHH represents the upper limit of the mill outlet temperature;

[0059] MM_CK_TT_HH represents the upper limit of the mill outlet temperature;

[0060] MM_CK_TT_H represents the upper limit of the mill outlet temperature;

[0061] MM_CK_TT_L is the lower limit of the mill outlet temperature;

[0062] MM_CK_TT_LL represents the lower and upper limits of the mill outlet temperature;

[0063] MM_CK_TT_LLL represents the lower and upper limits of the mill outlet temperature;

[0064] GMJ_SV is the set value for the coal feeder;

[0065] GMJ_SP1 represents a single increment or decrement of 1 for the coal feeder;

[0066] GMJ_SP2 represents the single increment / decrement value of 2 for the coal feeder;

[0067] T2 is the time interval between each increase or decrease in the coal feeder's feed rate;

[0068] It also includes the following steps:

[0069] Step 1: Adjust the flue gas flow rate setpoint based on the mill inlet temperature and mill outlet temperature.

[0070] When MM_RK_TT ≥ MM_RK_TT_H and MM_CK_TT ≥ MM_CK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_RK_TT... <MM_RK_TT_H;

[0071] When MM_CK_TT ≥ MM_CK_TT_H and MM_RK_TT ≥ MM_RK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_CK_TT... <MM_CK_TT_H;

[0072] When MM_RK_TT≤MM_RK_TT_L and MM_CK_TT≤MM_CK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After that, after every delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified to continue reducing the gas quantity until MM_RK_TT>MM_RK_TT_L.

[0073] When MM_CK_TT≤MM_CK_TT_L and MM_RK_TT≤MM_RK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After each delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified to continue reducing the gas quantity until MM_CK_TT>MM_CK_TT_L.

[0074] The gas regulating valve automatically adjusts its opening degree according to the set flow rate MQ_QT_SV using PID control.

[0075] Step 2: Automatic control of the flue gas furnace air regulating valve. The air flow setting value of the air regulating valve is calculated based on the gas regulating valve flow setting value and the set air-fuel ratio.

[0076] KQ_QT_SV = MQ_QT_SV * KRB_SV;

[0077] The flue gas furnace air flow rate KQ_QT_SV is automatically adjusted by PID control to regulate the valve opening.

[0078] Step 3: Automatic control of coal feed rate by the coal feeder;

[0079] When MM_CK_TT≥MM_CK_TT_H1, GMJ_SV= GMJ_SV + GMJ_SP1, increasing a total of 3 times, with an interval of T2 each time;

[0080] When MM_CK_TT≥MM_CK_TT_H2, GMJ_SV= GMJ_SV + GMJ_SP2. If the mill outlet temperature continues to rise, GMJ_SV= GMJ_SV + GMJ_SP2 is executed once for every 2℃ increase in MM_CK_TT.

[0081] When MM_CK_TT≥MM_CK_TT_HH, GMJ_SV= GMJ_SV + GMJ_SP1, increasing a total of 3 times, with an interval of T2 each time;

[0082] When MM_CK_TT≥MM_CK_TT_HHH, GMJ_SV= GMJ_SV + GMJ_SP2. If the mill outlet temperature continues to rise, GMJ_SV= GMJ_SV + GMJ_SP2 will be executed once every 2℃ increase in MM_CK_TT.

[0083] This invention automatically adjusts the flue gas flow rate, air flow rate, and coal feed rate of the coal feeder when changes in gas pressure, calorific value, or raw coal composition cause variations in the mill inlet and outlet temperatures, thereby controlling the mill inlet and outlet temperatures and achieving a stable system temperature. This invention can automatically adjust the flue gas flow rate, air flow rate, and coal feed rate, ensuring stable temperature control in the pulverizing system, improving pulverized coal quality, reducing manpower requirements, and solving technical problems.

[0084] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic temperature control method for a blast furnace pulverizing system, characterized in that... The following parameter settings are included: KRB_SV sets the randomness ratio; KRB_PV is the actual random ratio; MQ_QT_SV is the set value for the gas flow rate of the gas flow regulating valve; MQ_QT_Q1 represents the amount of gas flow that is increased or decreased each time; T1 is the time interval between each increase or decrease in gas flow rate; KQ_QT_SV is the set value for the gas flow rate of the air flow regulating valve; MM_RK_TT is the mill inlet temperature; MM_RK_TT_H is the upper limit of the mill inlet temperature; MM_RK_TT_L is the lower limit of the mill inlet temperature; MM_CK_TT is the mill outlet temperature; MM_CK_TT_SV is the setpoint for the mill outlet temperature; MM_CK_TT_HHH represents the upper limit of the mill outlet temperature; MM_CK_TT_HH represents the upper limit of the mill outlet temperature; MM_CK_TT_H represents the upper limit of the mill outlet temperature; MM_CK_TT_L is the lower limit of the mill outlet temperature; MM_CK_TT_LL represents the lower and upper limits of the mill outlet temperature; MM_CK_TT_LLL represents the lower and upper limits of the mill outlet temperature; GMJ_SV is the set value for the coal feeder; GMJ_SP1 represents a single increment or decrement of 1 for the coal feeder; GMJ_SP2 represents the single increment / decrement value of 2 for the coal feeder; T2 is the time interval between each increase or decrease in the coal feeder's feed rate; It also includes the following steps: Step 1: Adjust the flue gas flow rate setpoint based on the mill inlet temperature and mill outlet temperature. When MM_RK_TT ≥ MM_RK_TT_H and MM_CK_TT ≥ MM_CK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_RK_TT... <MM_RK_TT_H; When MM_CK_TT ≥ MM_CK_TT_H and MM_RK_TT ≥ MM_RK_TT_L, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1. After each delay T1, MQ_QT_SV = MQ_QT_SV + MQ_QT_Q1 is executed once. After the gas quantity increases three times, the air-fuel ratio is modified, and the gas quantity continues to increase until MM_CK_TT... <MM_CK_TT_H; When MM_RK_TT≤MM_RK_TT_L and MM_CK_TT≤MM_CK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After that, after every delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified and the gas quantity is reduced again until MM_RK_TT>MM_RK_TT_L. When MM_CK_TT≤MM_CK_TT_L and MM_RK_TT≤MM_RK_TT_H, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1. After each delay time T1, MQ_QT_SV=MQ_QT_SV-MQ_QT_Q1 is executed once. After the gas quantity is reduced 3 times, the air-fuel ratio is modified to continue reducing the gas quantity until MM_CK_TT>MM_CK_TT_L. The gas regulating valve automatically adjusts its opening degree according to the set flow rate MQ_QT_SV using PID control. Step 2: Automatic control of the flue gas furnace air regulating valve. The air flow setting value of the air regulating valve is calculated based on the gas regulating valve flow setting value and the set air-fuel ratio. KQ_QT_SV = MQ_QT_SV * KRB_SV; The flue gas furnace air flow rate KQ_QT_SV is automatically adjusted by PID control to regulate the valve opening. Step 3: Automatic control of coal feed rate by the coal feeder; When MM_CK_TT≥MM_CK_TT_HH, GMJ_SV= GMJ_SV + GMJ_SP1, increasing a total of 3 times, with an interval of T2 each time; When MM_CK_TT≥MM_CK_TT_HHH, GMJ_SV= GMJ_SV + GMJ_SP2. If the mill outlet temperature continues to rise, GMJ_SV= GMJ_SV + GMJ_SP2 will be executed once every 2℃ increase in MM_CK_TT.

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