KR20030053616A - Apparatus for contrlling tempurature in combustor coke furnace - Google Patents

Abstract

PURPOSE: An apparatus for controlling temperature of combustion chamber in coke oven is provided to automatically control flux of combustion gas by measuring temperatures of combustion chamber in coke oven in real time through thermometer and calculating temperature of the combustion chamber from average temperature thereof. CONSTITUTION: The apparatus includes a temperature measuring part(16) comprising a plurality of temperature sensors installed at the total combustion chambers of the coke oven to measure temperature of the respective combustion chambers; a temperature operation part(17) for calculating an average temperature of the combustion chambers by operating a plurality of temperature measured values impressed from the temperature measuring part; a temperature setting part(18) in which operator sets up a target temperature of the combustion chamber according to coke working amount; a temperature control part(19) for calculating flux of mixed gas for reaching the target temperature by comparing the average temperature impressed from the temperature operation part with the target temperature set in the temperature setting part; a flux setting part(11) in which operator manually sets up flux of the mixed gas impressed to the coke oven; a control value selection part for outputting the selected flux set value as a target flux value by selecting any one out of flux set value of the flux setting part and flux set value of the temperature control part; and a flux control part(12) for controlling the mixed gas so that a mixed gas corresponding to the target flux is impressed to the flux control part using the flux set value impressed from the control value selection part as a target value.

Description

Combustion chamber temperature control device for coke furnace {APPARATUS FOR CONTRLLING TEMPURATURE IN COMBUSTOR COKE FURNACE}

The present invention relates to a temperature control apparatus for a furnace combustion chamber of a Cocos plant, and more particularly, to a combustion chamber temperature control apparatus for controlling a target temperature according to a temperature change of a combustion chamber furnace by calculating an average temperature of the combustion chamber furnace.

Generally, in the coke plant, the combustion gas used as the combustion gas of the coke furnace uses a mixed gas (BFG + COG) mixed with blast furnace gas (BFG) and coke oven gas (COG). As shown in Fig. 1, the calorie analysis unit 1, the calorific control unit 2, the BFG flow rate detecting unit 3, the BFG flow rate indicating unit 4, the ratio processing unit 5, and the COG flow rate detecting unit ( 6), a COG flow rate control section 7, a COG flow rate control valve 8, and a heat quantity setting section 9 are provided.

Briefly explaining the operation by the above configuration, when the driver sets the calorific value of the combustion gas corresponding to the target temperature through the calorific value setting section 9, the calorific value of the combustion gas applied to the combustion chamber detected by the calorie detection unit 1 The value is input to the calorie control unit 2 and compared with the calorie set value. The calorific value control unit 2 outputs the adjusted calorific value by comparing the set value and the detected value, and the ratio processing unit 5 compares and calculates the COG adjustment value by the flow rate of the blast furnace gas applied from the BFG flow rate indicating unit 4. This output is applied to the COG flow rate control unit 7 and used for feedback control of the COG flow rate control valve 8.

At this time, the reference calorific value of the combustion gas is to set the calorific value of the combustion gas by forcibly calculating the temperature of the coke oven combustion chamber.

Then, the calorific value is adjusted to the target calorie by subtracting the flow rate of the relatively high COG gas, at this time, the driver must manually adjust the calorie set value of the combustion gas through the calorific value setting section 9 in accordance with the temperature change of the combustion chamber If the external temperature is different, such as winter and summer, the amount of heat required in the combustion chamber is different, which makes it difficult to set the calories.

In addition, in the coke furnace, one combustion chamber is divided into an odd number and even number of combustion chambers and is burned. Since the heat storage chamber and the combustion chamber are thermally conducted every 20 minutes, the temperature of the combustion chamber changes periodically, and the temperature of the combustion chamber changes irregularly. Because of this, there is a problem that it is very difficult to measure with the naked eye of the operator.

In addition, when the combustion gas flow rate control is performed based on the artificially measured combustion chamber temperature, the combustion gas flow rate control is difficult due to the continuous repetitive operation the next day because the temperature of the furnace combustion chamber is higher or lower than the target temperature. have.

In addition, accurate temperature control and calorie control are difficult by using a mixed gas for combustion (COG + BFG) with a large change in calorie value.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to measure a combustion chamber temperature of a coke oven in real time through a thermometer and calculate a combustion chamber temperature from the average, thereby automatically controlling the flow rate of the combustion gas in the coke furnace. It is to provide a temperature control device.

1 is a configuration diagram showing a conventional combustion chamber temperature control device.

2 is a configuration diagram showing a combustion chamber temperature control apparatus according to the present invention.

3 is a circuit diagram showing the detailed configuration of the average temperature calculation unit of the combustion chamber in the apparatus according to the present invention.

4 is a circuit diagram showing the detailed configuration of the flow control unit in the apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: calorie detection unit 2: calorie control unit

3: BFG flow detection unit 4: BFG flow indicating unit

5: ratio processing unit 6: COG flow detection unit

7: COG flow control part 8: COG flow control valve

9: heat quantity setting part 10: flow rate detection part

11: flow rate setting part 12: flow rate control part

14 flow control valve 16 temperature measuring unit

17: temperature calculation unit 18: temperature setting unit

19: temperature control unit 20: control value selection unit

As a constituent means for achieving the object of the present invention described above, the present invention is a combustion chamber temperature control apparatus for a coke oven in which a plurality of combustion chambers are provided, and the odd-numbered combustion chamber and the even-numbered combustion chamber operate alternately.

A temperature measuring unit configured to measure a temperature of each combustion chamber, comprising a plurality of temperature sensors respectively installed in the entire combustion chamber of the coke oven;

A temperature calculation unit calculating an average temperature of the combustion chamber by calculating a plurality of temperature measurement values applied by the temperature measuring unit;

A temperature setting unit for setting a target temperature of the combustion chamber by the operator according to the amount of coke work;

A temperature control unit for comparing the average temperature applied by the temperature operation unit with the target temperature set by the temperature setting unit to calculate a mixed gas flow rate for reaching the target temperature;

A flow rate setting unit for setting a flow rate of the mixed gas applied to the coke oven by the driver by manual operation;

A control value selection unit which selects one of a flow rate setting value of the flow rate setting unit and a flow rate setting value of the temperature control unit to output a target flow rate value;

Characterized in that the flow rate control unit for controlling so that the mixed gas of the target flow rate is applied to the target flow rate set value applied from the control value selection unit.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to attached drawing, the structure and operation | movement of the combustion chamber temperature control apparatus of the coke oven by this invention are demonstrated in detail.

FIG. 2 is a block diagram showing a combustion chamber temperature control apparatus for a coke oven according to the present invention, in which a calorie detector 1 for predicting and calculating the amount of heat generated by a mixed gas applied to a coke oven, and the calorie detector 1 A calorific control unit 2 for calculating the flow rate of the coke oven gas for reaching the target calories by comparing the calculated predicted calorie value with the target calorific value, and the BFG flow rate detecting unit 3 for detecting the flow rate of the blast furnace gas included as the mixed gas. And a flow rate of the blast furnace gas instructed by the BFG flow rate indicating section 4, which instructs the flow rate of the blast furnace gas so that a target flow rate is applied according to the flow rate detected by the BFG flow rate detecting section 3; Compared with the ratio processing part 5 which calculates the coke gas flow volume for reaching the target heat amount, the COG flow rate detection part 6 which detects the delivery flow volume of coke gas, and the coke gas applied from the said ratio processing part 5 COG flow rate control unit 7 for controlling the coke flow rate control valve 8 so that the coke gas is applied as much as the flow rate, and COG flow rate control valve installed in the coke gas pipe is adjusted by the COG flow rate control unit 7 ( 8), a calorific value setting unit 9 for setting a target calorific value by the user checking the combustion chamber state, a flow rate detecting unit 10 for detecting the actual flow rate of the mixed gas, and a target of the mixed gas according to the combustion chamber working state. A flow rate setting unit 11 which sets the flow rate by hand operation, a flow rate adjusting unit 12 which receives a real flow rate value so as to reach the input target flow rate and outputs a control value, and an output value of the flow rate adjusting unit 12 Opening amount is adjusted according to the flow rate control valve 14 is installed in the mixed gas pipe, and the temperature measuring unit 16 for measuring the temperature of each combustion chamber consisting of a plurality of temperature sensors respectively installed in the entire combustion chamber of the coke oven, and the temperature measurement To part 16 The temperature calculation unit 17 calculates the average temperature of the combustion chamber by calculating the applied measured value, the temperature setting unit 18 which sets the target temperature of the combustion chamber according to the amount of coke work, and the temperature calculation unit 17 The temperature control unit 19 for comparing the average temperature and the target temperature set by the temperature setting unit 18 to calculate the mixed gas flow rate for reaching the target temperature, and the flow rate setting value of the flow rate setting unit 11 and the The control value selection unit 20 selects one of the flow rate setting values of the temperature control unit 19 and applies it to the flow rate control unit 12.

The temperature operation unit 17 receives signals from a plurality of temperature sensors installed in each combustion chamber, and adds the signals of temperature sensors installed in the odd or even combustion chambers every time the combustion is changed every 20 minutes. It divides and calculates the average temperature of a combustion chamber.

When the temperature calculation unit 17 calculates the average temperature of the combustion chamber in real time, and the driver sets the target temperature of the combustion chamber according to the coke production operation rate through the temperature setting unit 18, the temperature control unit 19 is the temperature calculation unit ( Compare the combustion chamber average temperature measured in 17) with the temperature set value and set the mixed gas flow rate adjustment value corresponding to the temperature difference.

This is applied to the flow rate control unit 12 through the control value selection unit 20, the flow rate control unit 12 is compared to the actual flow rate measured by the flow rate detection unit 10 to the flow rate set in the temperature control unit 19 The opening degree of the flow regulating valve 14 is adjusted to reach.

That is, the present invention adjusts the amount of COG gas according to the calorific value control, and at the same time, by controlling the total flow rate of the mixed gas applied to the combustion chamber according to the average temperature of the combustion chamber, it is possible to precise temperature control.

3 to 4 are views illustrating the temperature measuring unit 16, the temperature calculating unit 17, the temperature controlling unit 19, and the mixed gas flow rate control unit in detail in the above-described temperature control device. The operation of the control device will be described in more detail.

The temperature measuring unit 17 is implemented as a plurality of non-type thermocouple (B-Type Thermo Couple) meter installed in each combustion chamber of the coke oven, the signal measured by each temperature sensor is input to the temperature calculation unit 17 do. In this case, the temperature calculation process is performed by dividing the odd-numbered combustion chamber and the even-numbered combustion chamber. The operation processing of the odd-numbered temperature sensors and the even-numbered temperature sensor signals is the same, and thus only the odd side will be described as an example.

The measurement signal of the odd-numbered temperature sensors 101 installed in the odd-numbered combustion chamber among the plurality of temperature sensors of the temperature measuring unit 17 is converted into a voltage signal by the voltage current converter 102 and then input to the adder 104 and at the same time the temperature sensor. It is provided with a number of input to each of the plurality of failure determination unit 100 corresponding to each.

The adder 104 outputs the sum of the measured values of the odd-numbered temperature sensor 101, and the sum is divided by the number of the temperature sensors which are input to the divider 105 and operated. That is, the temperature value output from the divider 105 becomes the average temperature of the odd-numbered combustion chamber.

Then, the failure determining unit 100 compares the detection signal output from the temperature sensor in the subtractor 106 with the average value calculated by the divider 105 to obtain the difference, and then the average value and the measured value. The difference between and is compared with the reference value in the comparator 107 to output a pulse indicating the failure in the logic sum circuit 106 when the deviation is out of the upper and lower range deviation.

The failure signal of the corresponding temperature sensor output from the plurality of failure determination units 100 is input to the counter 109 and counted, and the counting value of the counter 109 is inputted to the subtractor 111 to provide a failed temperature sensor. It is used to calculate the number of the normal temperature sensor except the normal operation, the amount of the temperature sensor in the steady state output from the subtractor 111 is applied to the divider 105, it is used to calculate the temperature average value.

In addition, the fault determination unit 100 outputs a fault signal and operates the relay 110 to prevent the output of the corresponding temperature sensor from being transmitted to the adder 104.

The measured value of the temperature sensor 201 installed in the even-numbered combustion chamber is also the same in the fault determination unit 200, the adder 204, the divider 205, the counter 209, and the subtractor 211.

Therefore, the temperature calculating unit 17 outputs the average temperature of the even-numbered combustion chamber and the odd-numbered combustion chamber of the coke oven by the operation described above.

The temperature control unit 19 receives the average temperature of the even-numbered combustion chamber and the average temperature of the odd-numbered combustion chamber output from the temperature calculation unit 17 and outputs a flow rate adjustment value for temperature control. Will be explained.

The average temperature of the even-numbered combustion chamber and the average temperature of the odd-numbered combustion chamber calculated by the temperature calculating section 17 are input to the comparators 191 and 192, respectively, and are compared with the temperature setting values of the combustion chamber set by the temperature setting section 18, and The deviation is calculated, and each flow calculator 193, 194 calculates a flow control value necessary to increase the temperature of one combustion chamber from the deviation of the set temperature and the measured average temperature, which is calculated by the following equation (1).

In the above description, the quantity to be heated in the furnace is a value obtained by the furnace wall area (m 2) x thickness (m) x specific weight (kg / m 3).

The flow rate adjustment values output from the flow rate calculation units 103 and 104 are input to the multipliers 195 and 196, respectively, to multiply the number of odd-numbered combustion chambers and even-numbered combustion chambers to calculate the total flow rate of the mixed gas required for temperature adjustment.

Finally, one of the output values of the multipliers 195 and 196 is selected by the selection switching unit 197 and applied to the flow rate adjusting unit 12 as the flow rate target value through the control value selecting unit 20.

At this time, the operation of the selection switching unit 197 is controlled according to the operation flow of the combustion chamber.

The flow rate target value including the temperature control output from the temperature control unit 19 as described above is applied to the flow rate control unit 12, the flow rate control unit 12 is a flow rate control valve so that the flow rate of the mixed gas is the target value The opening degree of (14) is feedback-controlled.

The driver may adjust the switching operation of the selective switching unit 20 according to the working situation to automatically set the flow rate target value of the mixed gas according to the combustion chamber temperature through the temperature control unit 19, or the flow rate setting unit 11. Can be set manually by the driver.

As described above, by automatically setting the target flow rate of the mixed gas in accordance with the temperature change of the combustion chamber, the variation in furnace temperature is reduced, and as a result, the quality of the coke produced in the coke oven is improved and the combustion management efficiency is increased. In addition, there is an excellent effect that can extend the life of the refractory of the coke oven.

Claims (4)

In the combustion chamber temperature control apparatus of the coke oven which is provided with a plurality of combustion chambers and the odd-numbered combustion chamber and the even-numbered combustion chamber alternately operate, A temperature measuring unit configured to measure a temperature of each combustion chamber, comprising a plurality of temperature sensors respectively installed in the entire combustion chamber of the coke oven; A temperature calculation unit calculating an average temperature of the combustion chamber by calculating a plurality of temperature measurement values applied by the temperature measuring unit; A temperature setting unit for setting a target temperature of the combustion chamber by the operator according to the amount of coke work; A temperature control unit for comparing the average temperature applied by the temperature operation unit with the target temperature set by the temperature setting unit to calculate a mixed gas flow rate for reaching the target temperature; A flow rate setting unit for setting a flow rate of the mixed gas applied to the coke oven by the driver by manual operation; A control value selection unit which selects one of a flow rate setting value of the flow rate setting unit and a flow rate setting value of the temperature control unit to output a target flow rate value; A combustion chamber temperature control apparatus for a coke oven, characterized by comprising a flow rate control unit for controlling a mixed gas of a target flow rate to be applied using a flow rate setting value applied from the control value selection unit as a target value. The apparatus of claim 1, wherein the temperature measuring part comprises a plurality of non-type thermocouple (B-TypeThermo Couple) measuring instruments. The method of claim 1, wherein the temperature calculation unit First and second adders each summating temperature measurement values output from a plurality of temperature sensors installed in odd-numbered / even-numbered combustion chambers; First and second dividers for dividing the sum value output from the first and second adders by the number of operating temperature sensors to obtain an average value; A plurality of fault determinations are made corresponding to a plurality of temperature sensors, respectively, to determine whether or not the temperature measurement value output from the corresponding temperature sensor is out of an allowable range from a deviation from the average value output from the first and second dividers. part; A counter for detecting a signal of the fault determining unit corresponding to the odd / even temperature sensors and calculating a number of faulty temperature sensors; The first and second subtractors are applied to the first and second dividers by obtaining the number of temperature sensors in a steady state from the total number of temperature sensors for each odd-numbered and even-numbered combustion chambers and the number of fault temperature sensors calculated by the counter. Combustion chamber temperature control device of coke furnace. The method of claim 1 or 3, wherein the temperature control unit First and second comparators for calculating a deviation by comparing the average temperature of the odd-numbered combustion chambers and the average temperature of the even-numbered combustion chambers with temperature set values respectively outputted from a temperature calculation unit; From the temperature deviation of the even-numbered combustion chamber and the temperature deviation of the odd-numbered combustion chamber output from the first and second comparators First and second flow rate calculation unit for calculating the flow rate of the mixed gas for temperature control by; First and second multipliers configured to multiply the first and second flow rate setting values output from the first and second flow rate calculation units by the number of odd-numbered combustion chambers and the number of even-numbered combustion chambers, respectively, to calculate a total flow rate; And A combustion chamber temperature control apparatus for a coke oven, characterized in that the selective switching operation is performed according to the combustion chamber selection of the coke oven to output one of the total flow rates of the mixed gas output from the first and second multipliers.