KR20020053506A - Gas current control apparatus of vertical type plasticicty furnace - Google Patents

Abstract

PURPOSE: A gas flow controller for vertical furnace is provided to supply optimal cokes flow for a long time without exchanging lance nozzles and prevent furnace from dropping temperature in advance. In addition, the controller prevents previously fire by protecting highly heated products occurring at conveyer belt abruptly. CONSTITUTION: The controller is composed of a number of parts such as lance nozzle(21), coke oven gas(COG) pressure meter(24), COG flow meter(25), gas flow controller(26), furnace pressure meter(27), furnace pressure controller(29). The lance nozzle is made of funnel-shaped reducers connected to fuel pipe instead of conventional hexagonal nut. The COG pressure and flow meters detect the status of COG supply and send detecting signals to a CRT(22) and a controller(23) in operation office. The gas flow controller(26) composed of COG control valves(7) to supply optimal COG by managing aperture and the furnace pressure meter detects furnace pressure and sends detecting signals to the controller, which alternatively keeps furnace pressure under 1800-2000mmH2O using furnace pressure controller made of furnace control valves(28).

Description

GAS CURRENT CONTROL APPARATUS OF VERTICAL TYPE PLASTICICTY FURNACE}

The present invention relates to a gas flow control device for a vertical vertical firing furnace, and more particularly, to provide an optimal COG flow rate for a long time without replacing the lance nozzle according to the production amount as in the conventional case, and at the same time, It can prevent the deterioration in advance to produce a product of uniform plasticity (high quality product) and to minimize the error rate of the product. The present invention relates to a gas flow control device for a vertical vertical firing furnace that prevents the discharge of a belt conveyor to prevent a fire accident.

In general, when the quicklime operation is performed in the vertical granular kilns (1a) and (1b), limestone ML (35-85mm) granulated in a belt loading conveyor (BELT CONVEYOR: (2)) as shown in FIG. Is charged into the firing furnaces 1a and 1b.

The COG, a heat source, is compressed in a coke booster (COG BOOSTER: 3), and then introduced into the kilns 1a and 1b, and the air required for coke combustion is blown through the combustion air blower 4. At the same time as the zoom, the firing time is executed by a program that is proportional to the output.

When the firing time ends, the dampers DAMPER 5 are opened and closed, and the firing furnaces 1a and 1b are replaced, and the above-described operation is repeated to fire the quicklime product.

At this time, the high-temperature exhaust gas remaining after firing in the kilns 1a and 1b after the heat exchange with the limestone by the operation of the respective dampers 5 when the kiln 1a performs the firing operation, It is discharged to the exhaust duct 6 side of the baking furnace 1b which is the opposite side.

Here, the coke and the combustion air as the heat source is the coke flow rate and combustion air calculated in accordance with the already set production amount is introduced into the firing furnace (1a, 1b) to achieve the combustion, the flow control of the coke is the coke control valve It will be controlled at (COG CONTROL VALVE: (7)).

On the other hand, the production range of the vertical vertical firing furnace (1a), (1b) is 220 ~ 330 TON / D, according to the production volume of the lance nozzle (8) consisting of several apertures as follows according to the production amount Coke flow rate can be supplied.

[Reference]

7.5Ø LANCE NOZZLE has 220 ~ 230T / D daily output

8Ø LANCE NOZZLE produces 240 ~ 260T / D per day

8.5Ø LANCE NOZZLE produces 260 ~ 280T / D per day

9Ø LANCE NOZZLE produces 280 ~ 300T / D per day

9.5Ø LANCE NOZZLE has 290 ~ 310T / D daily output

10Ø LANCE NOZZLE has 310 ~ 330T / D daily output

As shown in FIG. 8, the lance nozzle 8 must be replaced according to the production amount, so that the flame at the end of the lance nozzle 8 is kept constant during the firing operation, thereby producing high quality quicklime. I can produce it.

That is, the replacement of the lance nozzle 8 satisfies the pressure and the flow rate simultaneously, thereby securing the area of the combustion zone.

In order to replace the lance nozzle 8, a flexible hose mounted on a coke ring tube (COG RING TUBE: 9a, 9b) while the firing furnaces 1a and 1b are in operation are stopped. (10)) After disconnecting the quick coupling (11), disconnect the socket (SOCKET: (12)), but the lance nozzle (8) installed inside the hexagon nut (13) Becomes replaceable.

In addition, when installing the lance nozzle 8 of the suitable diameter for production, what is necessary is just to reverse the operation mentioned above.

Here, the number of the lance nozzles 8 is provided 18 pieces per one shaft, a total of 36 are installed.

As such, the lance nozzle (8) replacement by the change of production volume is largely made in six steps.In order to satisfy the coke supply flow rate and pressure at each time according to the production plan, the replacement work is performed once or twice a day. have.

Therefore, a conventional vertical kiln using such a lance nozzle has caused various problems during operation.

This is described in detail based on the order as follows.

First, the lance nozzle (8) is fixed to the tar component formed in the tube, as well as the problem of the need to replace the entire number of the lance nozzle (8) as described above can not be easily replaced quickly Raised,

Second, since the whole of the kilns 1a and 1b that were in operation during the replacement work should be rested, the temperature of the kilns in the kilns 1a and 1b is drastically lowered, and a lot of time and fuel is required to raise the temperature of the kilns. Wasting waste, causing significant problems in economics and productivity.

Third, the unbaked product in the manufacturing process not only passes the firing table, but also causes the problem of lowering the error rate of the product by going to the cooling stand.

Fourth, the unbaked product is exhibited to the maximum capacity of the cooling air blow (14) in the cooling table, even if the cooling is not performed properly, but is discharged to the product transport belt conveyor 20 in a high temperature state belt Frequently, a problem that causes a fire accident of the conveyor 20 has occurred.

The present invention has been made to solve the above-described problems, the object of which is to provide a long-term supply of the optimum COG flow rate without replacing the lance nozzle according to the amount of production as in the conventional case and at the same time lower the firing table temperature of the kiln It is possible to prevent unsuccessful cases and to produce a product of uniform plasticity (high quality product), and to minimize the error rate of the product. It is to provide a gas flow control device of a vertical kiln to prevent the discharge of the conveyor to prevent the risk of fire accidents in advance.

The above object is in the gas flow control device of the vertical granular kiln which can achieve the production of quicklime,

A lance nozzle portion formed by installing an inlet / outlet funnel-type reducer connected to an integrated fuel pipe in a portion where a conventional hexagon nut is installed; The coke pressure gauge and coke flowmeter which detects the coke supply state and transmits this detection signal to the CRT unit and the controller of the cab, and the coke to supply the appropriate coke to the kiln by adjusting the opening degree by the controller receiving the detection signal. A gas flow control unit comprising a control valve; The kiln pressure gauge which always detects the low pressure in the kiln and transmits this detection signal to the controller, and the rotatably controlled valve which maintains the pressure in the kiln about 1800 to 2000 mmH2O by adjusting the opening degree by the controller receiving the detection signal. Characterized in that it comprises a low pressure control unit made.

1 is a schematic diagram showing the overall configuration of the gas flow rate control apparatus of the vertical kiln according to the present invention,

Figure 2 is a front view showing the main portion of the configuration of the gas flow rate control apparatus of the vertical kiln according to the present invention,

3 is a fuel use state of the vertical kiln according to the present invention,

Figure 4 is a schematic diagram showing the gas flow inside the vertical kiln according to the present invention,

Figure 5 is a flow chart (FLOW CHART) shown to explain the operating state of the gas flow control device of the vertical kiln according to the present invention,

6a and 6b are comparative graphs showing the results of a comparative experiment between the prior art and the present invention,

7 is a quicklime manufacturing process diagram of a conventional vertical kiln,

8 is a detailed view showing the constitutional state of the lance nozzle used in the conventional vertical kiln for each aperture,

<Description of the symbols for the main parts of the drawings>

1a, 1b: Soseong-ro 2: Belt conveyor with raw stone

3: coke booster 4: combustion air blow

5: damper 6: exhaust duct

7: Coke control valve 8: Integrated fuel pipe

9a, 9b: coke ring tube 10: flexible hose

11 quick coupling 12 socket

13a, 13b: Inlet and outlet funnel-type reducer 14: Cooling air blow

16: coke line 17: lance

18a, 18b: Lance cooling ring tube 19: Lance cooling discharge line

21: Lance nozzle part 22: CRT part

23 controller 24 coke pressure gauge

25: coke flow meter 26: gas flow control unit

27 firing furnace pressure gauge 28 low pressure control valve

29: ROV control section 30: mV / l converter

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram showing the overall configuration of the gas flow control apparatus of the vertical kiln according to the present invention, Figure 2 is a front view showing the main configuration of the main portion of the gas flow control apparatus of the vertical kiln according to the present invention. .

As shown, a specific part of the lance 17, that is, the entrance funnel type exit funnel 13a, 13 connected by the integrated fuel pipe 8 to the site where the conventional hexagon nut 13 is installed. Is provided with a lance nozzle portion 21.

In addition, the coke pressure gauge 24 and the coke flowmeter 25 are installed in the coke line 16 to detect the coke supply state and transmit the detection signal to the CRT unit 22 and the controller 23 of the cab. The gas flow controller 26 is formed of a coke control valve 7 for adjusting the opening degree by the controller 23 receiving the detection signal and supplying the appropriate coke to the kilns 1a and 1b. have.

And the opening degree is adjusted by the kiln pressure gauge 27 which always detects the low pressure in the kiln 1a, 1b, and transmits this detection signal to the controller 23, and the controller 23 which received this detection signal. The low pressure control part 29 which consists of the low pressure control valve 29 which keeps the pressure in the kiln 1a, 1b about 1800-2000 mmH2O is comprised.

When described in detail with reference to the accompanying drawings, diagrams and embodiments of the operation and its operation according to the configuration configured as follows.

3 is a fuel use state diagram of a vertical kiln according to the present invention, Figure 4 is a schematic diagram showing the gas flow inside the vertical kiln according to the present invention, Figure 5 is a gas flow control of the vertical kiln according to the present invention FIG. 6A and FIG. 6B are comparative graphs showing results of comparative experiments between the prior art and the present invention.

First, the amount of coke used according to the amount of production in the conventional vertical granular furnaces 1a and 1b is shown in Table 1 below.

(Table 1) Coke Consumption by Production

Production amount (T / D) Coke Usage (Nm3 / h) 220 1837.5 230 1921.0 240 2004.5 250 2088.1 260 2171.6 270 2255.1 280 2338.6 290 2422.2 300 2505.7 310 2589.2 320 2672.7 330 2756.3

As can be seen from the above (Table 1), the amount of coke used according to the production amount is from 1837.5 to 2756.3 Nm3 / h.

Based on the above results, the maximum supply flow rate of coke according to the diameter and temperature of the lance nozzle 8 was examined and the results shown in Table 2 are obtained.

(Table 2) Maximum supply flow rate by diameter of each lance nozzle (Ø7.5 ~ Ø10)

Nozzle Ø Flow rate (Nm3 / h) Minimum (MIN ¹ ) MAX ¹ 7.5 1384.6 1983.4 8 1579.2 2252.8 8.5 1781.3 2544.7 9 1833.7 2851.6 9.5 2222.9 3180.9 10 2462.4 3525.2 Remarks Coke temperature (40 ~ 60 ℃)

The result of Table 2 was derived by Equation 1 below.

Referring to (Table 1) and (Table 2) above, the coke temperature of the 9Ø lance nozzle (8) is 40 ° C based on the data derived from the conventional lance nozzle (8) maximum coke flow rate conversion table. It can be concluded that flow rates down to 1893.56 Nm3 to 2851.56 Nm3 can be supplied into the kilns 1a and 1b.

Therefore, the coke flow rate of 1893.56 Nm3, the lowest coke feed flow rate, can produce 220T / D based on the daily output, and the coke flow rate of 2851.56 Nm3, the maximum coke feed flow rate, which can produce 330T / D based on the daily yield. The preconditions for supplying coke will be established.

Due to the conditions for establishing the coke feed flow rate, the lance nozzle 8 is integrated in a state in which the furnace pressures of the kilns 1a and 1b are kept constant even though the diameter of the conventional lance nozzle 8 is not changed in six steps from 7.5Ø to 10Ø. By mounting only one fuel pipe (6), it is possible to freely change the daily output from 220T / D to 330T / D.

This will be described in more detail with reference to the following Examples.

In order to confirm the effects of the present invention configured as described above, the lance nozzles 8 used in the above-described firing furnaces 1a and 1b are replaced with the integrated fuel pipe 8, and the low pressure is applied to the exhaust duct 6 part. The control valve 29 was installed, and the coke pressure gauge 24, the coke flowmeter 25, and the kiln pressure gauge 27 were operated as follows.

As shown in FIG. 1, when the driver determines the daily output of the kilns 1a and 1b in the cab CRT unit 22 and sets the appropriate heat consumption according to the setting, the appropriate coke flow rate of the coke booster 3 is set. After determining the appropriate air ratio for the coke combustion in the combustion air blower 4 into the firing furnaces 1a and 1b, after cooling the quicklime product in the cooling air blower 14, the hot air is removed from the firing side. It is discharged to the exhaust duct 6 located on the opposite side.

When the pressure inside the kilns 1a and 1b is sensed by the kiln pressure gauge 27 during the firing operation as described above and then transmitted to the cab CRT unit 22 via the mmV / I converter 30, the kiln 1a set in advance ), (1b) The low pressure control valve 28 automatically opens and closes via the controller 23 to match the low pressure of 2000 mmH2O (here, 2000 mmH2O.) And the pressure of the kiln (1a) and (1b). Is set to 2000 mmH2O.

Subsequently, when the production amount is changed, when the production amount is inputted in the cab CRT unit 22, the firing time is ended by a program proportional to the output, and each damper (5) is opened and closed, and the firing furnace 1a, ( After 1b) is replaced, the coke flow rate, combustion air flow rate, and cooling air flow rate are automatically introduced into the kilns 1a and 1b according to the changed production set point. ), And the internal pressure of the kilns 1a and 1b is automatically opened and closed through the controller 23 to adjust 2000mmH2O, and the kiln pressure is 2000mmH2O. Will be matched.

As a result of applying the same to the firing furnaces 1a and 1b, the data values as shown in Table 3 below were obtained.

(Table 3) Data analysis table according to the use of integrated fuel pipes compared to production

Production amount (T / D) Firing furnace low pressure (mmH2O) Coke flow rate (Nm ³ ) Coke Flow (kg / h) Coke Flow (kg / s) Furnace Control Valve Damper New lance nozzle diameter (Ø) 220 2000 1837.50 883.8 0.245 15 9Ø 230 2000 1921.02 923.9 0.256 15-30 9Ø 240 2000 2004.54 964.1 0.268 35 9Ø 250 2000 2088.06 1004.3 0.278 35-50 9Ø 260 2000 2171.59 1044.5 0.290 55 9Ø 270 2000 2255.11 1084.6 0.301 55 to 70 9Ø 280 2000 2338.63 1124.8 0.312 75 9Ø 290 2000 2422.15 1165.0 0.323 75 to 85 9Ø 300 2000 2505.68 1205.2 0.334 90 9Ø 310 2000 2589.20 1245.3 0.346 90 to 95 9Ø 320 2000 2672.72 1285.5 0.357 95 9Ø 330 2000 2756.25 1325.7 0.368 95 to 100 9Ø

As shown in Table 3 above, the integrated fuel pipe 8 alone can supply the coke flow rate according to the change in production, and the low pressure control valve () is operated frequently so that the low pressure can be maintained. It is possible to continuously produce high-quality products without the pause of).

As described above, the present invention enables to supply the optimum COG flow rate for a long time without replacing the lance nozzle according to the production amount as well as to prevent the case where the firing zone temperature of the kiln is lowered. It is possible to produce products of uniform firing (high quality products), and to minimize the error rate of products, and to prevent fire of high-temperature products from the product transportation belt conveyor due to unfired products. It has the effect of preventing the risk in advance.

Claims (1)

In the gas flow control device of a vertical vertical kiln, which can produce quicklime, A lance nozzle portion 21 formed by installing inlet / outlet funnel-type reducers 13a and 13b connected to the conventional hexagonal nut 13 by the integrated fuel pipe 8; The coke pressure gauge 24 and the coke flowmeter 26 which detect the coke supply state and transmit this detection signal to the CRT unit 22 and the controller 23 of the cab, and the controller 23 receiving the detection signal. A gas flow control section 26 made of a coke control valve 7 for adjusting the opening degree so that the appropriate coke is supplied into the firing furnaces 1a and 1b; Opening degree is adjusted by the kiln pressure gauge 27 which always detects the low pressure in the kiln 1a, 1b, and transmits this detection signal to the controller 23, and the controller 23 which received this detection signal, A gas flow control device for a vertical kiln, characterized in that it comprises a low pressure control unit (29) consisting of a low pressure control valve (28) for maintaining the pressure in (1a) and (1b) about 1800 to 2000 mmH2O.