CN113564292A - Whole temperature state monitoring system of furnace hearth - Google Patents

Abstract

The invention provides a furnace hearth overall temperature state monitoring system which comprises a dead charge column constitution evaluation unit, a furnace hearth fluidity index calculation unit, a direct reduction carbon consumption calculation unit, a furnace bottom temperature management unit, a furnace hearth lower part heat management unit, a furnace hearth middle tuyere area heat accumulation calculation unit, a comprehensive evaluation indexing unit, a furnace condition adjustment unit and a furnace hearth overall temperature evaluation database. The invention fully considers the characteristic of large lag of the blast furnace and realizes the on-line monitoring of the whole temperature of the hearth through a decagonal diagram mode.

Description

Whole temperature state monitoring system of furnace hearth

Technical Field

The invention belongs to the technical field of blast furnace operation, and particularly relates to a furnace hearth overall temperature state monitoring system.

Background

The hearth activity depends on three factors, temperature, fluidity, coke particle size and state of deposit, and the large inner volume of the hearth is 3200m³For a blast furnace, the estimated volume including a dead material column and a hearth dead iron layer is 1000m³Above, such huge volume has extremely unstable and uneven internal working state, and the furnaceThe uniformity of the hearth state determines the exertion of the working capacity of the hearth.

The regulation factors for controlling the state of the hearth are four, namely a blast system, material distribution regulation, temperature control, slag iron discharge and the like. The quality and quantity of coke entering a hearth are determined by material distribution, the production function of the hearth is determined by slag iron emission, a blowing system is a determining factor for converting the hearth state, the furnace temperature is the basis of the working state of the whole hearth, and the slag iron emission and the primary air flow distribution can be ensured only by sufficient, uniform and continuous furnace temperature, so that the smooth material distribution is ensured.

In the past, the control of molten iron temperature and slag temperature is mostly focused on the management of hearth temperature, and a plurality of enterprises take the molten iron temperature Thm being more than or equal to 1500 +/-10 ℃ as a control target and properly control the fluctuation of the silicon content [ Si ] in the molten iron within the range of 0.25-0.5 percent. However, molten iron mainly exists around a dead material column of the furnace hearth, the temperature of the molten iron is changed violently in the tapping process, the content of the [ Si ] of the molten iron can be reduced from 0.7% to 0.2% within 1.5 hours, the temperature of the molten iron cannot reflect the temperature of the dead material column, and the temperature of the dead material column can determine the temperature state of the furnace hearth in essence. The blast furnace is a system with multiple variables, large hysteresis and nonlinearity, the key variables influencing the state of the hearth have long-term continuous influence on the state of the hearth after being deteriorated, and the blast furnace does not take effect immediately after being adopted aiming at measures for the deterioration of the hearth, and even if temperature state parameters of the hearth are converted into a normal range, the state of the hearth still has large hysteresis.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide a system for monitoring the overall temperature state of a furnace hearth, which fully considers the characteristic of large hysteresis of a blast furnace and realizes the online monitoring of the overall temperature of the furnace hearth through a decagonal diagram mode.

The technical scheme adopted by the invention is as follows: a furnace hearth overall temperature state monitoring system comprises a dead charge column constitution evaluation unit, a furnace hearth fluidity index calculation unit, a direct reduction carbon consumption calculation unit, a furnace bottom temperature management unit, a furnace hearth lower part heat management unit, a furnace hearth middle tuyere area heat accumulation calculation unit, a comprehensive evaluation indexing unit, a furnace condition adjustment unit and a furnace hearth overall temperature evaluation database; the system comprises a dead material column forming evaluation unit, a coal injection system and a coal injection system, wherein the dead material column forming evaluation unit is used for acquiring state sampling information of coal ash content, coke thermal strength and coke ash content of injection coal, and assigning values to the coal ash content parameter, the coke thermal strength parameter and the coke ash content parameter according to the state sampling information; the hearth fluidity index calculation unit is used for acquiring state sampling information of hearth slag alkalinity and viscosity and assigning values to slag alkalinity parameters and slag viscosity parameters according to the state sampling information; the direct reduction carbon consumption calculation unit is used for acquiring a periodic calculation result of the melting loss carbon integral and assigning the melting loss carbon parameter according to the calculation result; the furnace bottom temperature management unit is used for acquiring state sampling information of the furnace core temperature and assigning values to the furnace core temperature parameters according to the state sampling information; the furnace hearth lower part heat management unit is used for acquiring state sampling information of the molten iron temperature and assigning values to the molten iron temperature parameters according to the state sampling information; the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth is used for acquiring the periodic calculation results of the heat index integral and the blowing kinetic energy integral and respectively assigning values to the heat index parameter and the blowing kinetic energy parameter according to the calculation results; the comprehensive evaluation index unit is used for calculating and generating a comprehensive index and a decagonal graph for representing the comprehensive index based on the coal-blowing ash parameter, the coke heat intensity parameter, the coke ash parameter, the slag alkalinity parameter, the slag viscosity parameter, the melting loss carbon parameter, the furnace core temperature parameter, the molten iron temperature parameter, the heat index parameter and the blowing kinetic energy parameter; the furnace condition adjusting unit generates processing measures based on sampling or calculation results of coal ash content of injection, coke heat intensity, coke ash content, slag alkalinity, slag viscosity, melting loss carbon, furnace core temperature, molten iron temperature, heat index integral and blast kinetic energy integral; and the furnace hearth overall temperature evaluation database is used for storing the acquired state sampling information for each unit to obtain and call.

In the technical scheme, the dead stock column formation evaluation unit sets judgment ranges for the ash content of the injection coal, the thermal strength of the coke and the ash content of the coke, and assigns values to parameters of the dead stock column formation evaluation unit according to the judgment ranges of the sampling state information of the ash content of the injection coal, the thermal strength of the coke and the ash content of the coke;

the determination threshold of the injected coal Ash PCI _ Ash comprises PCI _ Ash _ L1, PCI _ Ash _ L2 and PCI _ Ash _ L3, wherein PCI _ Ash _ L1 < PCI _ Ash _ L2 < PCI _ Ash _ L3; when PCI _ Ash is less than or equal to PCI _ Ash _ L1, the PCI _ Ash' parameter is assigned to + 10; when PCI _ Ash _ L1 < PCI _ Ash ≦ PCI _ Ash _ L2, the PCI _ Ash' parameter is assigned to + 5; when PCI _ Ash _ L2 < PCI _ Ash ≦ PCI _ Ash _ L3, the PCI _ Ash' parameter is assigned to-5; when PCI _ Ash > PCI _ Ash _ L3, the PCI _ Ash' parameter is assigned to-10;

the judgment threshold of the Coke thermal intensity Coke _ CSR comprises Coke _ CSR _ L1, Coke _ CSR _ L2 and Coke _ CSR _ L3, wherein Coke _ CSR _ L1 < Coke _ CSR _ L2 < Coke _ CSR _ L3; when the Coke _ CSR is less than or equal to the Coke _ CSR _ L1, assigning the parameter of the Coke _ CSR' as-10; when the Coke _ CSR _ L1 < Coke _ CSR ≦ Coke _ CSR _ L2, the Coke _ CSR' parameter is assigned to-5; when the Coke _ CSR _ L2 < Coke _ CSR ≦ Coke _ CSR _ L3, the parameter Coke _ CSR' is assigned to + 5; when Coke _ CSR > Coke _ CSR _ L3, the parameter Coke _ CSR' is assigned to + 10;

the determination threshold of the Coke Ash Coke _ Ash comprises Coke _ Ash _ L1, Coke _ Ash _ L2 and Coke _ Ash _ L3, wherein Coke _ Ash _ L1 < Coke _ Ash _ L2 < Coke _ Ash _ L3; when the Coke _ Ash is less than or equal to the Coke _ Ash _ L1, assigning the parameter of the Coke _ Ash' as + 10; when Coke _ Ash _ L1 < Coke _ Ash is not more than Coke _ Ash _ L2, the parameter of Coke _ Ash' is assigned to + 5; when Coke _ Ash _ L2 < Coke _ Ash is not more than Coke _ Ash _ L3, the parameter of Coke _ Ash' is assigned to-5; when Coke _ Ash > Coke _ Ash _ L3, the Coke _ Ash' parameter is assigned to-10.

In the technical scheme, the hearth fluidity index calculation unit sets a judgment range according to the integral calculation result of the slag viscosity and the slag alkalinity, and assigns values to parameter amplitudes of the hearth fluidity index calculation unit according to the judgment range in which the integral calculation result of the slag viscosity and the slag alkalinity is located;

the judgment thresholds of the slag basicity S _ R _ R include S _ R _ R _ L1, S _ R _ R _ L2 and S _ R _ R _ L3, wherein S _ R _ R _ L1 < S _ R _ R _ L2 < S _ R _ R _ R _ L3; when S _ R _ R is not more than S _ R _ R _ L1, the S _ R _ R' parameter is assigned to-5; when S _ R _ R _ L1 < S _ R _ R ≦ S _ R _ R _ L2, the S _ R _ R' parameter is assigned to + 10; when S _ R _ R _ L2 < S _ R _ R ≦ S _ R _ R _ L3, the S _ R _ R' parameter is assigned to + 5; when S _ R _ R > S _ R _ R _ L3, the S _ R _ R' parameter is assigned to-10;

the judgment threshold values of the Slag alkalinity Slag _ Vis _ R comprise Slag _ Vis _ R _ L1, Slag _ Vis _ R _ L2 and Slag _ Vis _ R _ L3, wherein Slag _ Vis _ R _ L1 < Slag _ Vis _ R _ L2 < Slag _ Vis _ R _ L3; when the Slag _ Vis _ R is not more than Slag _ Vis _ R _ L1, assigning the parameter of the Slag _ Vis _ R' to be + 10; when the Slag _ Vis _ R _ L1 is smaller than or equal to the Slag _ Vis _ R and is not larger than the Slag _ Vis _ R _ L2, assigning the parameter of the Slag _ Vis _ R' to be + 5; when the Slag _ Vis _ R _ L2 is smaller than the Slag _ Vis _ R and is not larger than the Slag _ Vis _ R _ L3, the parameter of the Slag _ Vis _ R' is assigned to be-5; when Slag _ Vis _ R > Slag _ Vis _ R _ L3, the Slag _ Vis _ R' parameter is assigned to-10.

In the technical scheme, the direct reduction carbon consumption calculation unit sets a judgment range for the integral calculation result of the melting loss carbon, and assigns values to the parameters of the direct reduction carbon consumption calculation unit according to the judgment range where the integral calculation result of the melting loss carbon is located;

the judgment threshold values of the melting loss carbon Slc _ R include Slc _ R _ L1, Slc _ R _ L2 and Slc _ R _ L3, wherein Slc _ R _ L1 < Slc _ R _ L2 < Slc _ R _ L3; when Slc _ R is not more than Slc _ R _ L1, assigning the parameter Slc _ R' as + 10; when Slc _ R _ L1 < Slc _ R ≦ Slc _ R _ L2, the Slc _ R' parameter is assigned to + 5; when Slc _ R _ L2 is smaller than Slc _ R and is not larger than Slc _ R _ L3, the parameter Slc _ R' is assigned to be-5; when Slc _ R > Slc _ R _ L3, the Slc _ R' parameter is assigned a value of-10.

In the technical scheme, the furnace bottom temperature management unit sets a judgment range for the temperature of the furnace core, and assigns values to parameters of the furnace bottom temperature management unit according to the judgment range of the sampling state information of the temperature of the furnace core;

the determination threshold of the furnace core temperature T _ Bottom comprises T _ Bottom _ L1, T _ Bottom _ L2 and T _ Bottom _ L3, wherein T _ Bottom _ L1 < T _ Bottom _ L2 < T _ Bottom _ L3; when T _ Bottom is less than or equal to T _ Bottom _ L1, assigning the value of the T _ Bottom' parameter as-10; when T _ Bottom _ L1 is more than T _ Bottom and less than or equal to T _ Bottom _ L2, the value of the T _ Bottom' parameter is-5; when T _ Bottom _ L2 is more than T _ Bottom and less than or equal to T _ Bottom _ L3, the value of the T _ Bottom' parameter is set to be + 5; when T _ Bottom > T _ Bottom _ L3, the T _ Bottom' parameter is assigned a value of + 10.

In the technical scheme, the furnace hearth lower part heat management unit sets a judgment range for the temperature of the molten iron, and assigns values to parameters of the furnace hearth lower part heat management unit according to the judgment range of the sampling state information of the temperature of the molten iron;

the determination threshold of the molten iron temperature T _ hm comprises T _ hm _ L1, T _ hm _ L2 and T _ hm _ L3, wherein T _ hm _ L1 is less than T _ hm _ L2 is less than T _ hm _ L3; when T _ hm is less than or equal to T _ hm _ L1, assigning the parameter of T _ hm' as-10; when T _ hm _ L1 is more than T _ hm and less than or equal to T _ hm _ L2, the value of the parameter of T _ hm' is assigned to be-5; when T _ hm _ L2 is more than T _ hm and less than or equal to T _ hm _ L3, the value of the parameter of T _ hm' is assigned to be + 5; when T _ hm > T _ hm _ L3, the T _ hm' parameter is assigned a value of + 10.

In the technical scheme, the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth sets a judgment range aiming at the integral calculation result of the thermal index and the blowing kinetic energy, and assigns values to the parameters of the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth according to the judgment range of the integral calculation result of the thermal index and the blowing kinetic energy;

the determination threshold of the heat index TQ _ R comprises TQ _ R _ L1, TQ _ R _ L2 and TQ _ R _ L3, wherein TQ _ R _ L1 < TQ _ R _ L2 < TQ _ R _ L3; when the TQ _ R is not more than the TQ _ R _ L1, assigning the parameter of the TQ _ R' as-10; when the TQ _ R _ L1 is larger than the TQ _ R and is not larger than the TQ _ R _ L2, the parameter of the TQ _ R' is assigned to be + 10; when the TQ _ R _ L2 is larger than the TQ _ R and is not larger than the TQ _ R _ L3, the parameter of the TQ _ R' is assigned to be + 5; when TQ _ R > TQ _ R _ L3, the parameter of TQ _ R' is assigned to-5;

the determination threshold values of the blowing kinetic energy WQ _ R include WQ _ R _ L1, WQ _ R _ L2, WQ _ R _ L3, wherein WQ _ R _ L1 < WQ _ R _ L2 < WQ _ R _ L3; when WQ _ R is not more than WQ _ R _ L1, the value of the WQ _ R' parameter is-10; when WQ _ R _ L1 < WQ _ R ≦ WQ _ R _ L2, the parameter WQ _ R' is assigned to-5; when WQ _ R _ L2 < WQ _ R ≦ WQ _ R _ L3, the parameter WQ _ R' is assigned a value of + 5; when WQ _ R > WQ _ R _ L3, the WQ _ R' parameter is assigned a value of + 10.

In the above technical solution, the calculation formula of the comprehensive evaluation index C _ Num is as follows:

C_Num＝PCI_Ash’+Coke_CSR’+Coke_Ash’+S_R_R’+Slag_Vis_R’+Slc_R’+T_Bottom’+T_hm’+TQ_R’+WQ_R’。

in the technical scheme, the comprehensive evaluation index unit sets a judgment range for the calculation result of the comprehensive evaluation index, and assigns the parameters according to the heat index and the judgment range in which the calculation result of the comprehensive evaluation index is located:

the decision threshold of the comprehensive evaluation index C _ Num comprises C _ Num _ L1, C _ Num _ L2 and C _ Num _ L3, wherein C _ Num _ L1 < C _ Num _ L2 < C _ Num _ L3; when C _ Num is less than or equal to C _ Num _ L1, assigning the C _ Num' parameter as-10; when C _ Num _ L1 < C _ Num ≦ C _ Num _ L2, the C _ Num' parameter is assigned to-5; when C _ Num _ L2 < C _ Num ≦ C _ Num _ L3, the C _ Num' parameter is assigned to + 5; when C _ Num > C _ Num _ L3, the C _ Num' parameter is assigned to +10

In the above technical solution, only when the value of the parameter satisfying the comprehensive evaluation index C _ Num' is-10 or-5, the furnace condition is adjusted by the phenomenon corresponding to the parameter constituting the decagonal diagram, and the generation strategy of the processing measure of the adjustment unit is as follows:

when the range of the sampling value of the coal Ash content of the injection coal is PCI _ Ash _ L2 < PCI _ Ash _ L3 or PCI _ Ash > PCI _ Ash _ L3, improving the quality of the injection coal and reducing the coal Ash content of the injection coal;

when the Coke heat intensity or the Coke Ash sampling value is in the range of Coke _ CSR & lt Coke _ CSR _ L1, or Coke _ CSR _ L1 & lt Coke _ CSR _ L2, or Coke _ Ash _ L2 & lt Coke _ Ash _ L3, or Coke _ Ash & gt Coke _ Ash _ L3, improving coal blending and Coke quality;

when the range of the calculation result of the slag alkalinity integral is S _ R _ R ≦ S _ R _ R _ L1 or S _ R _ R > S _ R _ L3, adjusting the slag alkalinity;

when the calculation result of the Slag viscosity integral is in the range of Slag _ Vis _ R _ L2 < Slag _ Vis _ R ≦ Slag _ Vis _ R _ L3 or Slag _ Vis _ R > Slag _ Vis _ R _ L3, improving the Slag system structure;

when the calculation result of the melting loss carbon integral is in the range of Slc _ R _ L2 < Slc _ R _ L3 or Slc _ R > Slc _ R _ L3, the furnace temperature is increased, and the gas utilization rate is improved;

when the range of the temperature sampling value of the furnace core is T _ Bottom ≦ T _ Bottom _ L1 or T _ Bottom _ L1 ≦ T _ Bottom _ L2, improving the slag iron discharge and increasing the temperature of the furnace Bottom;

when the range of the molten iron temperature sampling value is T _ hm & lt, T _ hm _ L1 or T _ hm _ L1 & lt, T _ hm _ L2, the molten iron temperature is increased;

when the range of the calculation result of the heat index integration is TQ _ R ≦ TQ _ R _ L1 or TQ _ R > TQ _ R _ L3, the heat of the high-temperature area is increased;

when the calculation result of the blowing kinetic energy integration is in the range of WQ _ R ≦ WQ _ R _ L1 or WQ _ R _ L1 ≦ WQ _ R _ L2, the blowing kinetic energy is increased.

The invention has the beneficial effects that: the selected parameters are based on the current operation situation of a blast furnace smelting expert system, the parameters are verified by engineering practical application, the parameters are conventionally available, the combination of different parameters and the time accumulation effect of part of the parameters are different, the difference is fully considered, and the method is an innovation of the method.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a block diagram of the present invention.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

As shown in fig. 1, the present invention provides a system for monitoring the overall temperature state of a hearth, and the application process thereof comprises the following steps:

sending the measured values of the key influence factors to a total temperature evaluation database of the furnace hearth; the dead material column constitution evaluation unit, the furnace hearth fluidity index calculation unit, the direct reduction carbon consumption calculation unit, the furnace bottom temperature management unit, the furnace hearth lower part heat management unit and the furnace hearth middle tuyere zone heat accumulation calculation unit respectively call required data from a furnace hearth overall temperature evaluation database to evaluate and assign single factor parameters influencing the overall temperature; and the comprehensive evaluation index unit generates a comprehensive evaluation result based on the assignment result of each single-factor parameter. And the furnace condition adjusting unit generates a corresponding processing measure according to the evaluation result of the single-factor parameter. In the invention, the detection and test data of the ash content of the coal to be injected, the thermal strength of the coke and the ash content of the coke are adopted. Slag basicity and viscosity were obtained by simple calculation. The melting loss carbon is obtained by calculation of a blast furnace process monitoring expert system. The furnace core temperature adopts an industry standard calculation method. The temperature of the molten iron is measured. The heat index is calculated and obtained by a blast furnace process monitoring expert system. The blast kinetic energy is obtained by calculation of a blast furnace process monitoring expert system.

As shown in FIG. 2, the invention provides a system for monitoring the overall temperature state of a hearth, which comprises a blast furnace state monitoring module, a comprehensive evaluation indexing unit, a furnace condition adjusting unit, a hearth overall temperature evaluation database and a calculation management module. The calculation management module comprises a dead charge column formation evaluation unit, a furnace hearth fluidity index calculation unit, a direct reduction carbon consumption calculation unit, a furnace bottom temperature management unit, a furnace hearth lower part heat management unit and a furnace hearth middle tuyere area heat accumulation calculation unit.

The total temperature of the hearth depends on three factors, namely temperature, fluidity, coke particle size and accumulation state, and the inner volume of the hearth is huge, so that the total temperature of the hearth is 3200m³For a blast furnace, the estimated volume including a dead material column and a hearth dead iron layer is 1000m³As described above, the internal operating state of such a large volume is extremely unstable and uneven, the uniformity of the hearth state determines the overall temperature state of the hearth, and the temperature state directly controls carburization, reduction, flow, and air permeability, thereby exerting various functions. The present invention focuses on the following key factors and is characterized by the following table using appropriate parameters.

The blast furnace state monitoring module acquires the data and stores the data in an Oracle database table Date1, namely a furnace hearth overall temperature evaluation database.

The dead stock column composition evaluation unit selects 3 parameters as parameters for dead stock column composition evaluation, namely, the injected coal Ash PCI _ Ash, the Coke thermal strength Coke _ CSR and the Coke Ash Coke _ Ash, and controls the state of the hearth by setting threshold values according to the action of each parameter.

And the hearth fluidity index calculation unit is used for calculating the slag viscosity and the slag alkalinity integral. Because the influence of the slag viscosity and the slag alkalinity on the hearth has hysteresis, the longer the hearth is polluted by the high-alkalinity and high-viscosity slag, the greater the processing difficulty is, and the influence of the slag alkalinity and the viscosity of the hearth on the working state of the hearth is estimated by adopting an integral mechanism. The invention considers the influence elimination time, prolongs the iron time for 50 times after the alkalinity is considered, and prolongs the iron time for 50 times after the viscosity is considered.

Slag alkalinity S _ R _ R integral algorithm: the data are calculated once for each time of iron, and the accumulated value of the iron is calculated for 50 times to be used as the criterion of the slag alkalinity.

Slag viscosity Slag _ Vis _ R integration algorithm: the data are calculated once for each time of iron, and the cumulative value of the iron is calculated for 50 times as the criterion of the slag viscosity.

And the direct reduction carbon consumption calculation unit is used for acquiring the integral of the melting loss carbon Slc _ R, calculating the data once every 15 minutes, and calculating the 24-hour accumulated value as a criterion of the influence of the melting loss carbon.

	Slc _ R control Range	Slc _ R' assignment
			1	Slc_R≤Slc_R_L1	+10
2	Slc_R_L1＜Slc_R≤Slc_R_L2	+5
			3	Slc_R_L2＜Slc_R≤Slc_R_L3	-5
4	Slc_R＞Slc_R_L3	-10

The furnace Bottom temperature management unit is used for acquiring the furnace core temperature T _ Bottom, calculating the data once every 15 minutes, and calculating an accumulated value for 72 hours as a criterion of the influence of the furnace core temperature.

And the heat management unit at the lower part of the furnace hearth is used for acquiring the temperature T _ hm of the molten iron and calculating the accumulated value of the iron for 10 times as a judgment basis.

	T _ hm control Range	T _ hm' assignment
			1	T_hm≤T_hm_L1	-10
2	T_hm_L1＜T_hm≤T_hm_L2	-5
			3	T_hm_L2＜T_hm≤T_hm_L3	+5
4	T_hm＞T_hm_L3	+10

And the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth is used for acquiring the integral TQ _ R of the heat index, calculating the data once every 15 minutes and calculating the accumulated value of 10 hours as the criterion of the heat index. And integrating the blowing kinetic energy WQ _ R, calculating the data once every 15 minutes, and calculating an integrated value of 72 hours as a criterion of the blowing kinetic energy.

	WQ _ R control Range	WQ _ R' assignments
			1	WQ_R≤WQ_R_L1	-10
2	WQ_R_L1＜WQ_R≤WQ_R_L2	-5
			3	WQ_R_L2＜WQ_R≤WQ_R_L3	+5
4	WQ_R＞WQ_R_L3	+10

The comprehensive evaluation indexing unit accumulates the data in the tables every 15 minutes to obtain a comprehensive index:

C_Num＝PCI_Ash’+Coke_CSR’+Coke_Ash’+S_R_R’+Slag_Vis_R’+Slc_R’+T_Bottom’+T_hm’+TQ_R’+WQ_R’。

meanwhile, a decagonal diagram is obtained for evaluating the overall thermal state of the blast furnace.

	C _ Num control Range	C _ Num' assignment
			1	C_Num≤C_Num_L1	-10
2	C_Num_L1＜C_Num≤C_Num_L2	-5
			3	C_Num_L2＜C_Num≤C_Num_L3	+5
4	C_Num＞C_Num_L3	+10

The furnace condition adjusting unit has four regulating factors for controlling the state of the furnace hearth, such as a blast system, material distribution and regulation, temperature control, slag iron discharge and the like. The quality and quantity of coke entering a hearth are determined by material distribution, the production function of the hearth is determined by slag iron emission, a blowing system is a determining factor for converting the hearth state, the furnace temperature is the basis of the working state of the whole hearth, and the slag iron emission and the primary air flow distribution can be ensured only by sufficient, uniform and continuous furnace temperature, so that the smooth material distribution is ensured.

And only under the condition that the value of C _ Num is-10 or-5, the phenomenon corresponding to the parameters forming the decagonal diagram is considered to be adjusted.

From the above construction of the decagonal diagram, it is natural to find a furnace condition adjustment strategy, as shown in the following table.

The 3200m3 blast furnace is taken as an example to provide an implementation case.

A3200 m3 blast furnace has a top radius of 4.5m, a hearth diameter of 12 m, and a dead material column with a bullet shape with a bottom diameter of about 8 m and a height of about 10 m.

The dead stock column composition evaluation unit selects 3 parameters as parameters for dead stock column composition evaluation, namely, the injected coal Ash PCI _ Ash, the Coke thermal strength Coke _ CSR and the Coke Ash Coke _ Ash, and controls the state of the hearth by setting threshold values according to the action of each parameter.

	PCI _ Ash control Range	PCI _ Ash' assignment
			1	PCI_Ash≤11.5	+10
2	11.5＜PCI_Ash≤12.3	+5
			3	12.3＜PCI_Ash≤13	-5
4	PCI_Ash＞13	-10

The influence of the slag viscosity and the slag alkalinity on the hearth is considered by the hearth fluidity index calculation unit to have hysteresis, the longer the hearth is polluted by the high-alkalinity and high-viscosity slag, the greater the processing difficulty is, and an integral mechanism is adopted to estimate the influence of the slag alkalinity and the viscosity of the hearth on the working state of the hearth. The impact elimination time is considered here, the alkalinity is considered to be followed by 50 iron times and the viscosity is considered to be followed by 50 iron times.

Slag alkalinity S _ R _ R integral algorithm: and calculating the data once for each time of iron, and calculating the cumulative slag alkalinity value of the iron for 50 times to serve as a criterion of the slag alkalinity.

	S _ R _ R control Range	S _ R _ R' assignment
			1	S_R_R≤55	-5
2	55＜S_R_R≤60	+10
			3	60＜S_R_R≤67	+5
4	S_R_R＞67	-10

Slag viscosity Slag _ Vis _ R integration algorithm: the data are calculated once for each time of iron, and the cumulative value of the iron is calculated for 50 times as the criterion of the slag viscosity.

	Slag _ Vis _ R control Range	Slag _ Vis _ R' assignment
			1	Slag_Vis_R≤160	+10
2	160＜Slag_Vis_R≤180	+5
			3	180＜Slag_Vis_R≤200	-5
4	Slag_Vis_R＞200	-10

The direct reduction carbon consumption calculation unit calculates the melting loss carbon Slc _ R integral once every 15 minutes, and calculates the 24-hour accumulated value as the criterion of the influence of the melting loss carbon.

	Slc _ R control Range	Slc _ R' assignment
			1	Slc_R≤9600	+10
2	9600＜Slc_R≤10000	+5
			3	10000＜Slc_R≤11000	-5
4	Slc_R＞11000	-10

The furnace core temperature T _ Bottom is calculated by the furnace Bottom temperature management unit every 15 minutes, and the cumulative value of 72 hours is calculated to be used as a criterion of the influence of the furnace core temperature.

	T _ Bottom control Range	T _ Bottom' assignment
			1	T_Bottom≤90000	-10
2	90000＜T_Bottom≤117000	-5
			3	117000＜T_Bottom≤135000	+5
4	T_Bottom＞135000	+10

And the heat management unit at the lower part of the furnace hearth calculates the accumulated value of the molten iron temperature T _ hm for 10 times as the basis of judgment.

	T _ hm control Range	T _ hm' assignment
			1	T_hm≤14800	-10
2	14800＜T_hm≤14900	-5
			3	14900＜T_hm≤15000	+5
4	T_hm＞15000	+10

The heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth calculates the integral TQ _ R once every 15 minutes, and calculates the accumulated value for 10 hours as the criterion of the heat index. And integrating the blowing kinetic energy WQ _ R, calculating the data once every 15 minutes, and calculating an integrated value of 72 hours as a criterion of the blowing kinetic energy.

	TQ _ R control Range	TQ _ R' assignments
			1	TQ_R≤1036800	-10
2	1036800＜TQ_R≤1152000	+10
			3	1152000＜TQ_R≤1230000	+5
4	TQ_R＞1230000	-5

	WQ _ R control Range	WQ _ R' assignments
			1	WQ_R≤2880000	-10
2	2880000＜WQ_R≤3600000	-5
			3	3600000＜WQ_R≤3888000	+5
4	WQ_R＞3888000	+10

And accumulating the data in the table by the comprehensive evaluation indexing unit every 15 minutes to obtain a comprehensive index C _ Num and simultaneously obtain a decagonal graph for evaluating the overall thermal state of the blast furnace.

	C _ Num control Range	C _ Num' assignment
			1	C_Num≤55	-10
2	55＜C_Num≤70	-5
			3	70＜C_Num≤80	+5
4	C_Num＞80	+10

The furnace condition adjusting unit has four regulating factors for controlling the state of the furnace hearth, such as a blast system, material distribution and regulation, temperature control, slag iron discharge and the like. The quality and quantity of coke entering a hearth are determined by material distribution, the production function of the hearth is determined by slag iron emission, a blowing system is a determining factor for converting the hearth state, the furnace temperature is the basis of the working state of the whole hearth, and the slag iron emission and the primary air flow distribution can be ensured only by sufficient, uniform and continuous furnace temperature, so that the smooth material distribution is ensured. From the above construction of the decagonal diagram, it is natural to find a furnace condition adjustment strategy, as shown in the following table.

Those not described in detail in this specification are within the skill of the art.

Claims (10)

1. The utility model provides a whole temperature condition monitored control system of crucible which characterized in that: the system comprises a dead material column constitution evaluation unit, a furnace hearth fluidity index calculation unit, a direct reduction carbon consumption calculation unit, a furnace bottom temperature management unit, a furnace hearth lower part heat management unit, a furnace hearth middle tuyere area heat accumulation calculation unit, a comprehensive evaluation indexing unit, a furnace condition adjustment unit and a furnace hearth overall temperature evaluation database; the system comprises a dead material column forming evaluation unit, a coal injection system and a coal injection system, wherein the dead material column forming evaluation unit is used for acquiring state sampling information of coal ash content, coke thermal strength and coke ash content of injection coal, and assigning values to the coal ash content parameter, the coke thermal strength parameter and the coke ash content parameter according to the state sampling information; the hearth fluidity index calculation unit is used for acquiring state sampling information of hearth slag alkalinity and viscosity and assigning values to slag alkalinity parameters and slag viscosity parameters according to the state sampling information; the direct reduction carbon consumption calculation unit is used for acquiring a periodic calculation result of the melting loss carbon integral and assigning the melting loss carbon parameter according to the calculation result; the furnace bottom temperature management unit is used for acquiring state sampling information of the furnace core temperature and assigning values to the furnace core temperature parameters according to the state sampling information; the furnace hearth lower part heat management unit is used for acquiring state sampling information of the molten iron temperature and assigning values to the molten iron temperature parameters according to the state sampling information; the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth is used for acquiring the periodic calculation results of the heat index integral and the blowing kinetic energy integral and respectively assigning values to the heat index parameter and the blowing kinetic energy parameter according to the calculation results; the comprehensive evaluation index unit is used for calculating and generating a comprehensive index and a decagonal graph for representing the comprehensive index based on the coal-blowing ash parameter, the coke heat intensity parameter, the coke ash parameter, the slag alkalinity parameter, the slag viscosity parameter, the melting loss carbon parameter, the furnace core temperature parameter, the molten iron temperature parameter, the heat index parameter and the blowing kinetic energy parameter; the furnace condition adjusting unit generates processing measures based on sampling or calculation results of coal ash content of injection, coke heat intensity, coke ash content, slag alkalinity, slag viscosity, melting loss carbon, furnace core temperature, molten iron temperature, heat index integral and blast kinetic energy integral; and the furnace hearth overall temperature evaluation database is used for storing the acquired state sampling information for each unit to obtain and call.

2. The system for monitoring the overall temperature state of the hearth according to claim 1, wherein: the dead stock column constitution evaluation unit sets judgment ranges for the ash content of the injected coal, the thermal strength of the coke and the ash content of the coke, and assigns values to parameters of the dead stock column constitution evaluation unit according to the judgment ranges of the sampling state information of the ash content of the injected coal, the thermal strength of the coke and the ash content of the coke;

the determination threshold of the injected coal Ash PCI _ Ash comprises PCI _ Ash _ L1, PCI _ Ash _ L2 and PCI _ Ash _ L3, wherein PCI _ Ash _ L1 < PCI _ Ash _ L2 < PCI _ Ash _ L3; when PCI _ Ash is less than or equal to PCI _ Ash _ L1, the PCI _ Ash' parameter is assigned to + 10; when PCI _ Ash _ L1 < PCI _ Ash ≦ PCI _ Ash _ L2, the PCI _ Ash' parameter is assigned to + 5; when PCI _ Ash _ L2 < PCI _ Ash ≦ PCI _ Ash _ L3, the PCI _ Ash' parameter is assigned to-5; when PCI _ Ash > PCI _ Ash _ L3, the PCI _ Ash' parameter is assigned to-10;

the judgment threshold of the Coke thermal intensity Coke _ CSR comprises Coke _ CSR _ L1, Coke _ CSR _ L2 and Coke _ CSR _ L3, wherein Coke _ CSR _ L1 < Coke _ CSR _ L2 < Coke _ CSR _ L3; when the Coke _ CSR is less than or equal to the Coke _ CSR _ L1, assigning the parameter of the Coke _ CSR' as-10; when the Coke _ CSR _ L1 < Coke _ CSR ≦ Coke _ CSR _ L2, the Coke _ CSR' parameter is assigned to-5; when the Coke _ CSR _ L2 < Coke _ CSR ≦ Coke _ CSR _ L3, the parameter Coke _ CSR' is assigned to + 5; when Coke _ CSR > Coke _ CSR _ L3, the parameter Coke _ CSR' is assigned to + 10;

the determination threshold of the Coke Ash Coke _ Ash comprises Coke _ Ash _ L1, Coke _ Ash _ L2 and Coke _ Ash _ L3, wherein Coke _ Ash _ L1 < Coke _ Ash _ L2 < Coke _ Ash _ L3; when the Coke _ Ash is less than or equal to the Coke _ Ash _ L1, assigning the parameter of the Coke _ Ash' as + 10; when Coke _ Ash _ L1 < Coke _ Ash is not more than Coke _ Ash _ L2, the parameter of Coke _ Ash' is assigned to + 5; when Coke _ Ash _ L2 < Coke _ Ash is not more than Coke _ Ash _ L3, the parameter of Coke _ Ash' is assigned to-5; when Coke _ Ash > Coke _ Ash _ L3, the Coke _ Ash' parameter is assigned to-10.

3. The system for monitoring the overall temperature state of the hearth according to claim 2, wherein: the hearth fluidity index calculation unit sets a judgment range according to the integral calculation result of the slag viscosity and the slag alkalinity, and assigns values to parameter amplitudes according to the judgment range in which the integral calculation result of the slag viscosity and the slag alkalinity is located;

the judgment thresholds of the slag basicity S _ R _ R include S _ R _ R _ L1, S _ R _ R _ L2 and S _ R _ R _ L3, wherein S _ R _ R _ L1 < S _ R _ R _ L2 < S _ R _ R _ R _ L3; when S _ R _ R is not more than S _ R _ R _ L1, the S _ R _ R' parameter is assigned to-5; when S _ R _ R _ L1 < S _ R _ R ≦ S _ R _ R _ L2, the S _ R _ R' parameter is assigned to + 10; when S _ R _ R _ L2 < S _ R _ R ≦ S _ R _ R _ L3, the S _ R _ R' parameter is assigned to + 5; when S _ R _ R > S _ R _ R _ L3, the S _ R _ R' parameter is assigned to-10;

the judgment threshold values of the Slag alkalinity Slag _ Vis _ R comprise Slag _ Vis _ R _ L1, Slag _ Vis _ R _ L2 and Slag _ Vis _ R _ L3, wherein Slag _ Vis _ R _ L1 < Slag _ Vis _ R _ L2 < Slag _ Vis _ R _ L3; when the Slag _ Vis _ R is not more than Slag _ Vis _ R _ L1, assigning the parameter of the Slag _ Vis _ R' to be + 10; when the Slag _ Vis _ R _ L1 is smaller than or equal to the Slag _ Vis _ R and is not larger than the Slag _ Vis _ R _ L2, assigning the parameter of the Slag _ Vis _ R' to be + 5; when the Slag _ Vis _ R _ L2 is smaller than the Slag _ Vis _ R and is not larger than the Slag _ Vis _ R _ L3, the parameter of the Slag _ Vis _ R' is assigned to be-5; when Slag _ Vis _ R > Slag _ Vis _ R _ L3, the Slag _ Vis _ R' parameter is assigned to-10.

4. The system for monitoring the whole temperature state of the hearth according to claim 3, wherein: the direct reduction carbon consumption calculation unit sets a judgment range for the integral calculation result of the melting loss carbon, and assigns values to the parameters of the direct reduction carbon consumption calculation unit according to the judgment range in which the integral calculation result of the melting loss carbon is located;

the judgment threshold values of the melting loss carbon Slc _ R include Slc _ R _ L1, Slc _ R _ L2 and Slc _ R _ L3, wherein Slc _ R _ L1 < Slc _ R _ L2 < Slc _ R _ L3; when Slc _ R is not more than Slc _ R _ L1, assigning the parameter Slc _ R' as + 10; when Slc _ R _ L1 < Slc _ R ≦ Slc _ R _ L2, the Slc _ R' parameter is assigned to + 5; when Slc _ R _ L2 is smaller than Slc _ R and is not larger than Slc _ R _ L3, the parameter Slc _ R' is assigned to be-5; when Slc _ R > Slc _ R _ L3, the Slc _ R' parameter is assigned a value of-10.

5. The system for monitoring the whole temperature state of the hearth according to claim 4, wherein: the furnace bottom temperature management unit sets a judgment range for the temperature of the furnace core, and assigns values to parameters of the furnace bottom temperature management unit according to the judgment range where the sampling state information of the temperature of the furnace core is located;

the determination threshold of the furnace core temperature T _ Bottom comprises T _ Bottom _ L1, T _ Bottom _ L2 and T _ Bottom _ L3, wherein T _ Bottom _ L1 < T _ Bottom _ L2 < T _ Bottom _ L3; when T _ Bottom is less than or equal to T _ Bottom _ L1, assigning the value of the T _ Bottom' parameter as-10; when T _ Bottom _ L1 is more than T _ Bottom and less than or equal to T _ Bottom _ L2, the value of the T _ Bottom' parameter is-5; when T _ Bottom _ L2 is more than T _ Bottom and less than or equal to T _ Bottom _ L3, the value of the T _ Bottom' parameter is set to be + 5; when T _ Bottom > T _ Bottom _ L3, the T _ Bottom' parameter is assigned a value of + 10.

6. The system for monitoring the whole temperature state of the hearth according to claim 5, wherein: the furnace hearth lower part heat management unit sets a judgment range for the temperature of the molten iron, and assigns values to parameters of the furnace hearth lower part heat management unit according to the judgment range of the sampling state information of the temperature of the molten iron;

the determination threshold of the molten iron temperature T _ hm comprises T _ hm _ L1, T _ hm _ L2 and T _ hm _ L3, wherein T _ hm _ L1 is less than T _ hm _ L2 is less than T _ hm _ L3; when T _ hm is less than or equal to T _ hm _ L1, assigning the parameter of T _ hm' as-10; when T _ hm _ L1 is more than T _ hm and less than or equal to T _ hm _ L2, the value of the parameter of T _ hm' is assigned to be-5; when T _ hm _ L2 is more than T _ hm and less than or equal to T _ hm _ L3, the value of the parameter of T _ hm' is assigned to be + 5; when T _ hm > T _ hm _ L3, the T _ hm' parameter is assigned a value of + 10.

7. The system for monitoring the whole temperature state of the hearth according to claim 6, wherein: the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth sets a judgment range according to the integral calculation result of the thermal index and the blowing kinetic energy, and assigns values to the parameters of the heat accumulation calculating unit of the tuyere area in the middle of the furnace hearth according to the judgment range where the integral calculation result of the thermal index and the blowing kinetic energy is located;

the determination threshold of the heat index TQ _ R comprises TQ _ R _ L1, TQ _ R _ L2 and TQ _ R _ L3, wherein TQ _ R _ L1 < TQ _ R _ L2 < TQ _ R _ L3; when the TQ _ R is not more than the TQ _ R _ L1, assigning the parameter of the TQ _ R' as-10; when the TQ _ R _ L1 is larger than the TQ _ R and is not larger than the TQ _ R _ L2, the parameter of the TQ _ R' is assigned to be + 10; when the TQ _ R _ L2 is larger than the TQ _ R and is not larger than the TQ _ R _ L3, the parameter of the TQ _ R' is assigned to be + 5; when TQ _ R > TQ _ R _ L3, the parameter of TQ _ R' is assigned to-5;

the determination threshold values of the blowing kinetic energy WQ _ R include WQ _ R _ L1, WQ _ R _ L2, WQ _ R _ L3, wherein WQ _ R _ L1 < WQ _ R _ L2 < WQ _ R _ L3; when WQ _ R is not more than WQ _ R _ L1, the value of the WQ _ R' parameter is-10; when WQ _ R _ L1 < WQ _ R ≦ WQ _ R _ L2, the parameter WQ _ R' is assigned to-5; when WQ _ R _ L2 < WQ _ R ≦ WQ _ R _ L3, the parameter WQ _ R' is assigned a value of + 5; when WQ _ R > WQ _ R _ L3, the WQ _ R' parameter is assigned a value of + 10.

8. The system for monitoring the whole temperature state of the hearth according to claim 7, wherein: the calculation formula of the comprehensive evaluation index C _ Num is as follows:

C_Num＝PCI_Ash’+Coke_CSR’+Coke_Ash’+S_R_R’+Slag_Vis_R’+Slc_R’+T_Bottom’+T_hm’+TQ_R’+WQ_R’。

9. the system for monitoring the whole temperature state of the hearth according to claim 8, wherein:

the comprehensive evaluation index unit sets a judgment range for the calculation result of the comprehensive evaluation index, and assigns the parameters according to the heat index and the judgment range in which the calculation result of the comprehensive evaluation index is located:

the decision threshold of the comprehensive evaluation index C _ Num comprises C _ Num _ L1, C _ Num _ L2 and C _ Num _ L3, wherein C _ Num _ L1 < C _ Num _ L2 < C _ Num _ L3; when C _ Num is less than or equal to C _ Num _ L1, assigning the C _ Num' parameter as-10; when C _ Num _ L1 < C _ Num ≦ C _ Num _ L2, the C _ Num' parameter is assigned to-5; when C _ Num _ L2 < C _ Num ≦ C _ Num _ L3, the C _ Num' parameter is assigned to + 5; when C _ Num > C _ Num _ L3, the C _ Num' parameter is assigned + 10.

10. The system for monitoring the whole temperature state of the hearth according to claim 9, wherein: only when the value of the parameter satisfying the comprehensive evaluation index C _ Num' is-10 or-5, the furnace condition is adjusted through the phenomenon corresponding to the parameter forming the decagonal diagram, and the generation strategy of the processing measure of the adjusting unit is as follows:

when the range of the sampling value of the coal Ash content of the injection coal is PCI _ Ash _ L2 < PCI _ Ash _ L3 or PCI _ Ash > PCI _ Ash _ L3, improving the quality of the injection coal and reducing the coal Ash content of the injection coal;

when the Coke heat intensity or the Coke Ash sampling value is in the range of Coke _ CSR & lt Coke _ CSR _ L1, or Coke _ CSR _ L1 & lt Coke _ CSR _ L2, or Coke _ Ash _ L2 & lt Coke _ Ash _ L3, or Coke _ Ash & gt Coke _ Ash _ L3, improving coal blending and Coke quality;

when the range of the calculation result of the slag alkalinity integral is S _ R _ R ≦ S _ R _ R _ L1 or S _ R _ R > S _ R _ L3, adjusting the slag alkalinity;

when the calculation result of the Slag viscosity integral is in the range of Slag _ Vis _ R _ L2 < Slag _ Vis _ R ≦ Slag _ Vis _ R _ L3 or Slag _ Vis _ R > Slag _ Vis _ R _ L3, improving the Slag system structure;

when the calculation result of the melting loss carbon integral is in the range of Slc _ R _ L2 < Slc _ R _ L3 or Slc _ R > Slc _ R _ L3, the furnace temperature is increased, and the gas utilization rate is improved;

when the range of the temperature sampling value of the furnace core is T _ Bottom ≦ T _ Bottom _ L1 or T _ Bottom _ L1 ≦ T _ Bottom _ L2, improving the slag iron discharge and increasing the temperature of the furnace Bottom;

when the range of the molten iron temperature sampling value is T _ hm & lt, T _ hm _ L1 or T _ hm _ L1 & lt, T _ hm _ L2, the molten iron temperature is increased;

when the range of the calculation result of the heat index integration is TQ _ R ≦ TQ _ R _ L1 or TQ _ R > TQ _ R _ L3, the heat of the high-temperature area is increased;

when the calculation result of the blowing kinetic energy integration is in the range of WQ _ R ≦ WQ _ R _ L1 or WQ _ R _ L1 ≦ WQ _ R _ L2, the blowing kinetic energy is increased.

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