KR101123901B1 - Apparatus for controlling vibration of hot blast stove - Google Patents

Abstract

Disclosed is a vibration control apparatus and method for a hot stove. The vibration control apparatus of such a hot stove includes a vibration measuring unit for measuring vibration of a predetermined point of the hot stove during combustion, a moving average unit for calculating a moving average of each point based on a signal input from the vibration measuring unit, and the movement. An arithmetic unit that receives a signal from an averaging unit, calculates an average, and compares it with a set value, a vibration control unit which performs vibration control of the hot air stove according to an output value of the arithmetic unit, and a calorie control unit controlling calories by a signal of the vibration control unit And a mix controller for controlling the mix gas based on the signal of the vibration controller.

Hot stove, vibration, control, calories, mix gas

Description

Vibration control device of hot stove {APPARATUS FOR CONTROLLING VIBRATION OF HOT BLAST STOVE}

1 is a general process diagram of a typical hot stove.

Figure 2 is a block diagram showing a combustion control process of the hot stove according to the prior art.

3 is a block diagram of a vibration control device of a hot stove in accordance with a preferred embodiment of the present invention.

4 is a process chart showing a process of controlling vibration by using the vibration control apparatus of the hot stove shown in FIG.

FIG. 5 is a flowchart illustrating a process of controlling vibration by using the vibration control apparatus of the hot stove shown in FIG. 3.

The present invention relates to a vibration control apparatus and a method of a hot stove, and more particularly, when the vibration occurs during the combustion of the hot stove for supplying hot wind to the blast furnace, by measuring the vibration to control the vibration value to a predetermined value or less, stable combustion The present invention relates to a vibration control apparatus and method for a hot stove.

In general, a hot air furnace refers to a furnace that produces hot air of 1000 to 1300 ° C to blow into a blast furnace. These hot stoves are classified into heat exchange type and heat storage type, but heat storage type is mainly used.

The regenerative hot-air furnace repeats the process of stacking heat-resistant bricks in a lattice shape in a lattice shape and burning the blast furnace gas to preheat the bricks, then stopping the gas and sending cold air to hot air.

As shown in FIG. 1, the operation process of the hot stove includes a mixed gas (MIX-GAS) in which blast furnace gas (BFG) 20 and coke oven gas (COG) 10 are mixed, and combustion air 30. Combustion process to accumulate heat in the heat storage chamber flue by blowing combustion, and replacement process to charge the inside of the hot stove (1) to blow cold air into the regenerated hot stove (1); After the hot air is blown into the regenerated hot air furnace (1) to create a hot air and then supply to the blast furnace, and the temperature control process of detecting the temperature of the front end of the blast furnace during the blowing process to control to a constant value.

This process of combustion is shown in more detail in FIG. As shown, the conventional hot stove 1 combustion control is the coke gas flow controller 100, the calorie controller 160, the combustion air controller 110, the mix gas flow controller 120, the dome And a (DOME) temperature controller 130, a gas gas temperature controller 140, and a gas gas oxygen (O 2) controller 150.

Therefore, initial quantity control, air-fuel ratio control, DOME temperature control, back gas temperature control, back gas oxygen control, and calorie control are performed.

The initial quantitative control is a control for securing the flow rate by starting the initial combustion and initially opening the MIXGAS amount to a certain degree.

In the air-fuel ratio control, the mix gas amount for the heat storage required for the hot stove 1 is set from the mix gas flow rate setter 122 to the mix gas flow rate controller 120.

The mixed gas theoretical performance ratio calculated by the values of the COG flow rate 12 and the BFG flow rate 21 and the COG theory air-fuel ratio setter 113 and the BFG theoretical air-fuel ratio setter 113 by this setting. The calculated value 112, the excess air ratio calculator 151 output value C, and the mixed gas flow rate value I are calculated to set the combustion air flow rate controller 110 with an air-fuel ratio value suitable for combustion to perform combustion.

The dome temperature control 130 is a case in which the selection switch 131 is selected as the first time and the selection switch 121 is selected as the second time at the initial combustion, and the set value of the output temperature of the dome of the hot stove 1 is set. The output of the dome temperature controller refers to a process of controlling by operating the set value of the mix gas flow controller 120 to raise up to.

In the case of the gas temperature control 140, when the selection switch 131 is selected twice, and the selection switch 121 is selected twice, controlling the temperature of the exhaust gas at a set value set by the driver at the end of combustion. For this purpose, the output of the exhaust gas temperature controller refers to a process of controlling by operating the set value of the mixed gas flow controller 120.

The above gaseous oxygen control 150 is used to detect oxygen in the exhaust gas during combustion and to control the set value set by the driver when the selector switch 121 is selected as number 1, and the output of the exhaust gas oxygen controller outputs excess air ratio. A process of adjusting the set value of the air controller 110 for combustion by calculating the set value of the excess air ratio setting unit 152 and the calculated output C value by the air-fuel ratio calculator 111 and controlling the set value of the combustion air controller 110. Say.

The calorie control is an output value O output by comparing the calorie value of the mix gas detected by the calorie detector 22 installed in the mix gas pipe with the calorie setting value 161 in the calorie controller 160, The flow rate of the coke oven gas (COG) is calculated by calculating the BFG calorie setter 102 set value M and the COG calorie setter 103 set value N as a set value of the COG flow controller 100. To control.

At this time, in the initial quantitative control, air-fuel ratio control, dome temperature control, gas temperature control, and gas gas oxygen control performed during the combustion process, vibrations always occur from 0 [MM] to 500 [MM] depending on the combustion state. In particular, in the case of dome temperature control, there is a problem in that the vibration is severely increased as the amount of the mixed gas is increased.

In addition, due to the vibration during combustion, there is a problem in that the heat storage chamber and the plumbing of the pipe inside the hot blast fall off causing the heat blast reduction of the hot blast or not closing the operation valve.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, an object of the present invention is to measure the vibration when the vibration occurs during the combustion of the hot blast furnace for supplying hot air to the blast furnace to the vibration value below a certain value The present invention provides a vibration control device and method for a hot stove for controlling combustion stably.

In addition, another object of the present invention is to provide a vibration control apparatus and method of a hot stove that can prevent the heat storage chamber and the plumbing of the pipe inside the hot stove is dropped off causing the heat accumulating of the hot stove is not closed or the operation valve is not closed. It is.

In order to achieve the above object, a preferred embodiment of the present invention includes a vibration measuring unit for measuring the vibration of a certain portion of the hot stove during combustion; A moving average unit for calculating a moving average of each location by the signal input from the vibration measuring unit; A calculator which receives a signal from the moving average unit, calculates an average, and compares the average with a set value; A vibration control unit for performing vibration control of the hot air path according to an output value of the calculation unit; A calorie controller for controlling calories in response to a signal of the vibration controller; And it provides a vibration control device for a hot stove including a mix gas control unit for controlling the mix gas in accordance with the signal of the vibration control unit.

Hereinafter, with reference to the accompanying drawings will be described in detail a vibration control apparatus and method of a hot stove in accordance with a preferred embodiment of the present invention.

1, 3, and 5, the vibration control apparatus of the hot stove proposed by the present invention includes a vibration measuring unit (2) for measuring the vibration of a certain portion of the hot stove (1) during combustion; The moving average part 3 which calculates the moving average of each place by the signal input from the said vibration measuring part 2, and receives a signal from the moving average part 3, calculates an average, and compares with a setting value. A calculation unit 4, a vibration control unit 5 for performing vibration control according to the output value of the operation unit 4, a calorie control unit 7 for controlling calories in response to a signal of the vibration control unit 5, and the vibration control unit And a mix gas control unit 9 for controlling the mix gas in accordance with the signal (5).                     

The vibration stabilization method using the vibration control device of the hot stove includes a vibration measuring step (S100) of measuring vibration of a predetermined portion of the hot stove (1) during combustion, and an input from the vibration measuring unit (2). A moving average calculating step (S110) of calculating a moving average of each location by the received signal, a calculating step (S120) of receiving a signal from the moving average unit 3, calculating an average, and comparing it with a set value; Vibration control step (S130) for performing the vibration control according to the output value of the calculating unit 4, calorie control step (S140) for controlling the calorie by the signal of the vibration control unit 5 and the signal of the vibration control unit 5 It includes a mix gas control step (S150) for controlling the mix gas by the.

In the vibration control device and method of the hot stove 1, the vibration measuring unit 2 is a first vibration measuring instrument 220 for measuring the vibration of the mix gas pipe 25 during combustion, and the combustion air pipe ( 30 is a second vibration measuring instrument 230 for measuring the vibration, the third vibration measuring instrument 210 for measuring the vibration of the hot stove dome 41, and the signals from the first to third vibration measuring instruments (220, 230, 210) It consists of the first to third indicators (211,221,231) for receiving.

The signal of the first vibration measuring instrument 220 measuring the vibration of the mix gas pipe 41 is input to the first vibration indicator 221 and is indicated and input to the first moving averager 222. The first moving averager 222 stores the set number n in the buffers S1 to Sn in the sampling order, and discards the values stored in the last buffer Sn when new data comes in. The moving value is calculated to calculate the output value b.

In addition, the signal of the vibration measuring instrument 230 for measuring the vibration of the combustion air pipe 30 is input to the second vibration indicator 231 is indicated and input to the second moving averager (232). The second moving averager 232 stores the set number n in the buffers S1 to Sn in the sampling order and discards the value stored in the last buffer Sn when new data comes in. The output value C is calculated by calculating the moving average of the pieces.

In addition, the signal of the third vibration measuring device 210 for measuring vibration of the hot stove dome part 41 is input to the third vibration indicator 211 and is indicated and input to the third moving averager 212. The third moving averager 212 stores the set number n in the buffers S1 to Sn in the sampling order, and discards the values stored in the last buffer Sn when new data comes in. The moving average is calculated to calculate the output value a.

The output values a, b, and c are transferred to the calculation unit 4 to calculate an average value and to compare with the set value.

The calculator 4 receives the signals of the first to third moving averagers 212, 222, and 232 to calculate an average of three output values, and an upper limit setter for setting the value of the average operator 240 ( The upper limit comparison unit 250 compares the upper limit set value inputted by 202.

That is, the output signals a, b, and c of the first to third moving averagers 212, 222, and 232 are input to the average operator 240 to calculate three average values d.

The average value (d) is input to the upper limit comparator 250 and the upper limit comparator 250 compares with the set value set by the upper limit setter 202 (180 mm in the present invention) when the upper limit set value is greater than or equal to the upper limit set value. Output the upper limit output contact.

The output contact point outputs the output of the vibration control unit 5 to the setting calculators 260 and 270 at the time of the on contact point.

The vibration control unit 5 performs vibration control by comparing the output contact point and the vibration setter 201 when the upper limit value is abnormal.

In more detail, the vibration controller 5 compares the output signal d1 of the upper limit comparator 250 with the set value of the vibration setter 201 and outputs a deviation output value e.

The output of the vibration control unit 5 is stable at 50% when the vibration value d1 is equal to the set value of the vibration setter 201, and the output is decreased at 50% when the vibration value d1 is larger than the set value, and the vibration value When (d1) is smaller than the set value, the output increases at 50%.

The vibration controller 5 outputs a signal to drive the calorie controller 7 and the mix gas controller 9.

The calorie control unit 7 includes calorie selectors 203 and 205 for controlling calorie control based on the output signal of the vibration control unit 5, and a calorie setting calculator for calculating a set value of the calorie control unit 7 when calorie control is selected. It consists of 260.

In more detail, the calorie selectors 203 and 205 include a first calorie selector 203 and a second calorie selector 205.

When the first calorie selector 203 is selected as 1 and the second calorie selector 205 is selected as 2, the calorie setting calculator 260 is set to the set value P of the calorie setter 161 by controlling calories according to vibration. ) Is added to the calorie controller 160 by adding the value obtained by multiplying the output signal e by the value of the correction coefficient k3 and controlling the calories. That is, the relation f = P + (e-50) * k3 holds.

In addition, the correction value k3 is for adjusting the size at which the output value e affects the calorie control. In the present invention, the correction value k3 is set to 0.1.

For example, if the set value P of the calorie setter 161 is 70% and the output of the vibration control unit 5 decreases due to the increase of vibration, the calorie setting calculator 260 is 70+ (30-50). Since the calorie 2% is reduced to 0.1 = 68% and is set in the calorie controller 160, the combustion COG is reduced to reduce the calories so that the vibration is reduced.

On the contrary, when the vibration is reduced and the output of the vibration controller 200 is increased to 70%, the calorie setting calculator 260 is set to the calorie controller 160 by increasing the calorie 2% by 70+ (70-50) 0.1 = 72. Therefore, the operation increases the COG.

On the other hand, the mix gas control unit 9 is a mix gas selector (204, 121) to control the mix gas in accordance with the output signal of the vibration control unit 5, and the set value of the mix gas control unit 9 when selecting the mix gas control It consists of a mix gas calculator 270 for calculating the.

In more detail, the mix gas selectors 204 and 121 include a first mix gas selector 204 and a second mix gas selector 121.

When the first mix gas selector 204 is set to "1" and the second mix gas selector 121 is set to "2", the mix gas flow rate setter 122 is controlled by controlling the mix gas according to vibration. The mix gas setting controller 270 adds a value obtained by multiplying the output signal e by the value of the correction coefficient k4 and sets the mixed gas flow controller 120 to control the mix gas flow rate. In other words, the relation g = Q + (e-50) * k4 holds.

The correction value (k4) is to adjust the size of the output (e) value affects the mix gas flow control in the present invention was set to 0.1 and can be adjusted by the driver.

For example, if the set value of the mix gas setter 122 is 70% and the output of the vibration controller decreases due to the increase of the vibration 30%, the mix gas set calculator 270 is 70+ (30-50) 0.1. = 68% of the mix gas is reduced by 2% is set in the mix gas flow controller 120 operates to reduce the mix gas flow rate.

On the contrary, when the vibration is reduced and the output of the vibration controller 200 increases to 70%, the mix gas setting operator 270 increases 70% of the gas mixture setting to 70+ (70-50) 0.1 = 72. Since the mix gas flow rate controller 120 is set, the mix gas flow rate is increased.

As described above, the calorie setting operator 260 and the mix gas setting operator 270 operate and control, and by such control, the initial initial quantity control, the air-fuel ratio control, the dome temperature control, the back gas temperature control, Gas oxygen control and calorie control are performed.

In more detail, the initial amount of quantitative control is control for securing flow rate by starting initial combustion and initially opening the MIXGAS amount to a certain degree.

In the air-fuel ratio control, the mix gas amount for the heat storage required for the hot stove 1 is set from the mix gas flow rate setter 122 to the mix gas flow rate controller 120. The mixture gas theory calculated by the values of the COG flow rate 12 and the BFG flow rate 21 and the COG theoretical performance ratio setter 113 and the BFG theory air-fuel ratio setter 113 by the setting. The air-fuel ratio calculation value 112 H, the excess air ratio calculator 151 output value C, and the mixed gas flow rate value I are calculated to set the air-fuel ratio value suitable for combustion in the combustion air flow controller 110 to perform combustion.

The dome temperature control 130 is a case in which the selection switch 131 is selected as the first time and the selection switch 121 is selected as the second time at the initial combustion, and the set value of the output temperature of the dome of the hot stove 1 is set. The output of the dome temperature controller refers to a process of controlling by operating the set value of the mix gas flow controller 120 to raise up to.

In the case of the gas temperature control 140, when the selection switch 131 is selected twice, and the selection switch 121 is selected twice, controlling the temperature of the exhaust gas at a set value set by the driver at the end of combustion. For this purpose, the output of the exhaust gas temperature controller refers to a process of controlling by operating the set value of the mixed gas flow controller 120.

The above gaseous oxygen control unit 150 is used to detect oxygen in the exhaust gas during combustion in the case where the second mix gas selector 121 is selected as the first and control the oxygen in the exhaust gas at a set value set by the driver. The control unit adjusts and controls the set value of the air controller 110 for combustion by calculating the set value of the excess air ratio setting unit 152 and the calculated output C value by the air-fuel ratio calculator 111. Say fair.

The selectors 203, 205, 204, and 121 operate in sequence such that the calorie control and the mix gas control are not selected at the same time.

Through this process, it is possible to operate stably by measuring the vibration of each position of the hot stove (1).

As described above, according to the vibration control apparatus of the hot stove according to the present invention it is possible to stably manage the vibration during the hot stove combustion within the range set by the driver has the advantage that the vibration of the hot stove is reduced.

In addition, due to the vibration during combustion, it is possible to prevent the smoke and dropping of the heat storage chamber and piping inside the hot stove, which does not cause problems in operation of the operation valves due to the dropped smoke and can extend the life of the hot stove facility. have.

The present invention can be variously modified by those skilled in the art to which the present invention pertains without departing from the scope of the present invention as claimed in the claims, and is not limited to the specific preferred embodiments described above. .

Claims (16)

Vibration measuring unit for measuring the vibration of a certain portion of the hot stove during combustion; A moving average unit for calculating a moving average of each location by a signal input from the vibration measuring unit; A calculator which receives a signal from the moving average unit, calculates an average, and compares the average with a set value; A vibration control unit for performing vibration control of the hot air path according to an output value of the calculation unit; A calorie controller for controlling calories in response to a signal of the vibration controller; And Vibration control device of a hot stove comprising a mix control unit for controlling the mix gas in accordance with the signal of the vibration control unit. The method of claim 1, The vibration measuring unit may include a first vibration measuring device for measuring vibration of the mix gas pipe during combustion, a second vibration measuring device for measuring vibration of the combustion air pipe, a third vibration measuring device for measuring vibration of the hot stove dome, and Vibration control apparatus of the hot stove consisting of first to third indicators for receiving a signal from the first to third vibration measuring instruments. 3. The method of claim 2, The moving average unit includes a first moving average to which a signal is input from a first vibratory clock, a second moving average to which a signal is input from a second vibrating clock, and a third moving average to which a signal is input from a third vibrating clock. Vibration control device of hot stove. The method of claim 3, The calculation unit is an upper limit comparison unit that receives an output value of the first to the third moving averager and calculates an average of three output values, and compares the average operator value with an upper limit setting value input by an upper limit setter. Vibration control device of the hot stove. The method of claim 4, wherein The vibration controller compares the output signal d1 of the upper limit comparator with the set value of the vibration setter and outputs a deviation output value e. When the vibration value d1 is equal to the set value of the vibration setter, the vibration control unit is stable. and an output is reduced when (d1) is larger than a set value, and the output is increased when the vibration value (d1) is smaller than a set value. The method of claim 5, The calorie control unit is a vibration control device of the hot stove consisting of a calorie selector for selecting the calorie control by the output signal of the vibration control unit and a calorie setting calculator for calculating the set value of the calorie control unit when the calorie control is selected. The method of claim 6, The calorie selector includes a first calorie selector and a second calorie selector, and a value obtained by multiplying the output value e by the calorie setting calculator multiplied by the correction coefficient k3 by the set value P of the calorie setter Vibration control device of the hot stove to control the calories by setting in the calorie controller. The method of claim 5, The mix gas controller includes a mix gas selector configured to control mix gas according to the output signal of the vibration controller, and a mix gas setting calculator configured to calculate a set value of the mix gas controller when the mix gas control is selected. Control unit. The method of claim 8, The mix gas selector includes a first mix gas selector and a second mix gas selector, and a correction coefficient k4 is applied to the output value e in the mix gas setting calculator to the set value Q of the mix gas flow rate selector. Vibration control device of hot stove to control the mix gas flow rate by adding the multiplied value to the mix gas flow rate controller. A vibration measuring step of measuring vibrations of a predetermined part of the hot stove during combustion; A moving average calculating step of calculating a moving average of each point by the signal obtained from the vibration measuring step; A calculation step of receiving a value calculated in the moving average calculation step, calculating an average and comparing the value with a set value; A vibration control step of performing vibration control according to the output value obtained in the calculation step; A calorie control step of controlling calories according to the output value of the vibration control step; And And a mix gas control step of controlling the mix gas according to the output value of the vibration control step unit. The method of claim 10, The vibration control method of the hot stove in the vibration measuring step to measure the vibration of the mix gas pipe, the air pipe, the hot stove dome portion by the first to third vibration measuring instruments. The method of claim 11, In the moving average calculation step, the measured output values are stored in the buffers S1 to Sn in the order of sampling, and when new data is input, n moving averages are calculated in such a manner as to discard the values stored in the last buffer Sn. Vibration control method of hot stove. The method of claim 12, And calculating the average d of the output values, comparing the average value d with an upper limit set value, and outputting an upper limit output contact to advance the vibration control step when the upper limit set value is equal to or greater than the upper limit set value. The method of claim 13, In the vibration control step, the output signal d1 of the upper limit comparator is compared with the set value of the vibration setter, and outputs a deviation output value e. When the vibration value d1 is equal to the set value of the vibration setter, the vibration is stable and vibrated. And the output is decreased when the value (d1) is larger than the set value, and the output is increased when the vibration value (d1) is smaller than the set value. 15. The method of claim 14, In the calorie control step, the calorie setting calculator adds a value obtained by multiplying the output value (e) by the correction coefficient (k3) by the output value (e) of the calorie setting unit by the output signal of the vibration control unit and setting the calorie controller. Vibration control method of hot stove to control calories. 15. The method of claim 14, In the mixing gas control step, the output signal e is multiplied by the correction coefficient k4 by the mixing gas setting calculator by the set value Q of the mixing gas flow rate setting unit according to the output signal of the vibration control unit. Vibration control method of hot stove to control the mix gas flow rate by setting on the mix gas flow controller.

Images