KR100994048B1 - An apparatus for controlling calorific value supplied to shaft kiln - Google Patents

Abstract

The present invention relates to an apparatus for producing uniform quicklime in a granule kiln for producing quicklime, and more particularly, to a granular firing furnace according to the weight ratio of limestone charged into the granite kiln. The present invention relates to a calorie control device of a vertical firing furnace provided to control calories.

The present invention includes a particle size sorting unit having a particle size sorter installed in communication with a lower portion of a flush stone storage hopper, and a limestone storage hopper installed in communication with the size sorter; A gravimetric unit having a basis weight hopper installed to communicate with the particle size separator and a lower portion of the limestone storage hopper and a weighing instrument installed below the basis weight hopper; And a calorie control unit having a fuel supply for supplying fuel into the granular furnace in communication with the basis weight hopper and a combustion air supply for supplying combustion air necessary for combustion of the fuel into the granular furnace. Provide a regulator.

Therefore, according to the present invention, by adjusting the amount of heat supplied according to the weight ratio of the size of the limestone charged into the granulation furnace, the limestone is not undercalcined or unbaked and produces the effect of producing quick lime You can get it.

Granite kiln, limestone, quicklime, screen, flush stone storage hopper

Description

Calorie control device of vertical firing furnace {AN APPARATUS FOR CONTROLLING CALORIFIC VALUE SUPPLIED TO SHAFT KILN}

1 is a schematic diagram of a conventional quicklime manufacturing equipment

Figure 2 is a schematic diagram showing the particle size of the ore according to the limestone level in the conventional washing stone storage hopper

Figure 3 is a schematic cross-sectional view showing a granular firing furnace of a conventional quicklime manufacturing equipment

Figure 4 is an overall schematic diagram showing a calorie control device of the granular furnace according to the present invention

5 is a detailed view of the calorie control device of the granular firing furnace according to the present invention

6 is a graph for (Table 1)

7 is a graph for (Table 2)

8 is a graph for (Table 3)

Explanation of symbols on the main parts of the drawings

10 ..... granularity sorter 12 ..... granularity sorter

12a, 12b ..... Screen 14,16 ..... 1st and 2nd Limestone Storage Hopper

30 ..... Weighing unit 32 ..... Basis weight hopper

34 ..... Weighing device 50 ..... Calorie control unit

52 ..... Fuel Supply 54 ..... Combustion Air Supply                 

106 ..... drum washers 112,114 .....

122,124 ..... Vertical firing furnace

The present invention relates to an apparatus for producing uniform quicklime in a granule kiln for producing quicklime, and more particularly, to a granular firing furnace according to the weight ratio of limestone charged into the granite kiln. The present invention relates to a calorie control device of a vertical firing furnace provided to control calories.

And therefore generally high desulfurizing agent or in the steelmaking process, calcium oxide is used as a refiner clean river there is a high quality burnt lime required to the production of clean river, the calcium oxide is heated to limestone (CaCO ₃₎ formed from calcite about 1 atmosphere 900 ℃ in a firing furnace It is produced by baking.

CaCO ₃ ------> CaO + CO ₂ ↑ (900 ℃ heating)

That is, when limestone is heated as described above, an endothermic reaction occurs to decompose carbon dioxide (CO ₂ ) from the limestone to generate quicklime (CaO).

Figure 1 shows a kiln (shaft kiln), which is one of the kilns for producing quicklime as described above, will be described as follows.

As shown in FIG. 1, limestones are stored in feeders 102a and 104a mounted at lower portions of the first and second ore gemstone storage hoppers 102 and 104, respectively. It is discharged to the drum washer 106 by the water, and the drum washer 106 washes with the limestone supplied as described above.

Among the limestones washed as described above, only limestone having a particle size of 10 mm or more is supplied to the second screen 110 by a belt conveyor by the first screen 108, and the second screen 110 has a particle size of 40 mm. The limestone of less than or equal to the first flush stone storage hopper 112, the limestone having a particle size of 40mm or more is separated and stored in the second flush stone storage hopper 114.

However, the limestone having a large particle size stored in the second flush stone storage hopper 114 as described above collides with the limestone stored in the second flush stone storage hopper 114 and has a non-uniform particle size. Are crushed into

That is, as shown in Figure 2, the lower the height of the limestone stored in the second flush stone storage hopper 114, the greater the impact force is applied to the falling limestone was pulverized finer.

On the other hand, as shown in Figure 1, the limestone pulverized as described above is separated again by the particle size by the third screen 116 is supplied and stored in the fixed hopper 118 installed on the top of the granular furnace (122,124) As described above, the limestone stored in the quantitative hopper 118 is supplied into the granular firing furnaces 122 and 124 according to the amount of quicklime, fired, and discharged by discharge (not shown) installed inside the granular firing furnaces 122 and 124. It is discharged to the quicklime which is a finished product.

Thereafter, limestone is repeatedly charged in the granular firing furnaces 122 and 124 of the two groups to continuously fire the limestone.

That is, as shown in FIG. 3, the waste granules are discharged from the one-side granular furnace 122 while the one-side granular furnace 122 is heated to fire the limestone charged therein. Preheated limestone is preheated.

Subsequently, when the firing of the limestone charged in the one side firing furnace 122 is completed and discharged, the limestone is charged in the one side firing furnace 122 and then the preheated limestone is calcined in the other side firing furnace 124. At this time, the lime granules charged in the same manner as described above is preheated in the one-piece granular furnace 122, thereby making quick lime by preheating and calcining the limestone.

Meanwhile, the granular kilns 122 and 124 use COG (Coke Oven Gas) as fuel, and the COG is supplied into the granular kilns 122 and 124 by the COG booster 126, and combustion air necessary for combustion of the COG is provided. Is supplied into the granular furnaces 122 and 124 by a combustion air blower 128 to maintain an appropriate air ratio required for combustion of the fuel COG.

Since the quicklime produced by the granular firing furnaces 122 and 124 has a high temperature, air is supplied by the cooling air blower 130 to cool the calcined calcined lime and the air is supplied by the lance cooling blower 132. In order to cool the lance (not shown), positive pressure is formed in the vertical baking furnaces 122 and 124.

That is, the positive pressure formed by COG, combustion air, cooling air, etc., supplied into the granular kiln where the limestone is calcined, moves the waste heat to the side of the granular kiln, where the calcining is not carried out. The limestone in the granular kiln does not preheat.

As described above, the calcining and preheating of limestone are repeated, and the granular firing furnaces 122 and 124 for preparing quicklime have a uniform pressure maintained therein, and the grain size of the limestone to be charged should be uniform so that the calcined material is uniformly calcined by a constant calorific value. Quicklime can be produced.

On the other hand, as shown in Figure 1, because the limestone crushed falling in the second flush raw stone storage hopper 114 is stored, limestone of non-uniform particle size is charged into the granulation furnace. At this time, the upper level of each hopper is provided with a level sensor, respectively, was adjusted the amount of charge according to the height.

However, since the size of limestone is not uniform, the amount of limestone charged in the granular calcining furnaces 122 and 124 is different and the degree of calcination for the supply calories is different. Occurred.

In order to prevent this, the amount of heat supplied into the granular firing furnaces 122 and 124 should be changed according to the particle size and the amount of the limestone charged into the granular firing furnaces 122 and 124, but fall from the first and second flushing stone storage hoppers 112 and 114 and crushed. Since it is impossible to determine the particle size of the limestone, there was a problem in that it is impossible to control the amount of heat supplied to the granular kilns 122 and 124 accordingly.

The present invention is to solve the conventional problems as described above, the calorific control device of the granular firing furnace improved to detect the weight of the limestone charged into the granular firing furnace by particle size and to adjust the amount of heat supplied into the granular firing furnace accordingly The purpose is to provide.

In order to achieve the above object, the present invention, the particle size selection unit having a particle size sorter installed to communicate with the lower portion of the raw stone storage hopper, and the first and second limestone storage hopper installed to communicate with the particle size sorter; A gravimetric unit having a basis weight hopper installed to communicate with the particle size separator and a lower portion of the first and second limestone storage hoppers and a weighing instrument installed below the basis weight hopper; And a calorie control unit having a fuel supply for supplying fuel into the granular furnace in communication with the basis weight hopper and a combustion air supply for supplying combustion air necessary for combustion of the fuel into the granular furnace. Provide a regulator.

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

4 is an overall schematic view showing the calorie control device of the granular furnace according to the present invention, Figure 5 is a detailed view of the calorie control device of the granular furnace according to the present invention, Figure 6 is a graph for (Table 1), 7 is a graph for (Table 2), Figure 8 is a graph for (Table 3).

4 and 5 are shown the calorie control device 1 of the granular firing furnace according to the present invention, the structure thereof is as follows.                     

Prior to explaining the configuration of the calorie control device 1 of the granular firing furnace according to the present invention will be briefly described the same parts as the conventional quicklime manufacturing equipment as follows.

As shown in Figure 4, the lower portion of the first and second raw stone storage hopper (102, 104), the feeder (102a, 104a) is installed in the lower portion of the drum washer 106 for washing the limestone is installed, the drum washer 106 Limestone supplied from the belt conveyor to the first screen 108 via the second screen 110 is configured to be stored in the first and second flush stone storage hoppers 112 and 114, respectively, depending on the particle size.

In addition, feeders 112a and 114a are respectively installed at the lower portions of the first and second flush stone storage hoppers 112 and 114, and a third screen 116 is installed directly below the first and second flush stone storage hoppers 112 and 114.

On the other hand, the calorie control device 1 of the granular firing furnace according to the present invention includes a particle size selection unit 10, a weight measurement unit 30, and a calorie control unit 50, first, the particle size selector 12 and the first The particle size selection part 10 including the 1, 2 limestone storage hoppers 14 and 16 will be described.

As shown in FIG. 4, a first basis weight hopper 18 is disposed below the third screen 116, and a guide tube in which an electric valve 19 is installed on an upper portion of the first basis weight hopper 18. 18a is formed to protrude, and a first weighing machine 20 fixed on a support frame (not shown) is disposed below.

That is, the first weighing unit 20 is fixed on the support frame (not shown), and the first basis weight hopper 18 is seated on the first weighing unit 20, so that the first basis weight The weight of the hopper 18 and the limestone stored therein is configured to be detected by the first weighing machine 20.                     

At this time, the third screen 116 is configured to communicate with the first basis hopper 18 disposed below the limestone supply pipe 22, a part of the lower portion of the limestone supply pipe 22 is the first It is inserted into the guide tube 18a of the basis weight hopper 18 and configured to stably supply the limestone supplied into the first basis weight hopper 18 through the third screen 116.

The particle size separator 12 is supported by a frame (not shown) in the lower portion of the first basis hopper 18 installed as described above, and the particle size separator 12 is installed by overlapping two screens 12a and 12b. Each of the screens 12a and 12b is connected to the first and second limestone storage hoppers 14 and 16 by pipes 12c and 12d, respectively.

In this case, the screens 12a and 12b have particle sizes of 20 mm and 45 mm, respectively, and if necessary, the number or size of the particles can be freely changed, and in this case, the number of limestone storage hoppers may also increase according to the number of screens. .

On the other hand, the first basis hopper 18 has a discharge pipe (18b) protruding from the lower portion is provided with an electric valve 21, the discharge tube (18b) of the first basis hopper 18 is the particle size selector (12) It is configured to stably supply limestone by being inserted into a guide tube formed at the top of the.

In addition, the particle size separator 12 and the first and second limestone storage hoppers 14 and 16 described above are connected to the basis weight hopper 32, respectively, and are electrically driven between the particle size separator 12 and the basis weight hopper 32. The valve 13 is provided, and the electric valves 14a and 16a are provided in the lower part of the 1st and 2nd limestone storage hoppers 14 and 16, respectively.                     

Next, the weighing unit 30 including the basis weight hopper 32 and the weighing unit 34 will be described.

As shown in FIG. 4, the basis weight hopper 32 is seated on a weighing machine 34 fixed on a support frame (not shown), so that the basis weight hopper 32 and the limestone stored therein. The weight is configured to be detected by the weighing machine 34.

At this time, the basis weight hopper 32 is provided with an electric valve 32a at the bottom thereof, and is configured to supply limestone into the fixed hopper 118 installed at the top of the vertical baking furnaces 122 and 124 by a belt conveyor.

On the other hand, a load cell, an electronic balance, or the like may be used as the weighing unit 34, and any other thing may be used as long as it senses a load.

Next, the heat quantity control part 50 provided with the fuel supply 52 and the combustion air supply 54 is demonstrated.

As shown in FIG. 4, the fuel supplier 52 is configured to supply COG, which is fuel, to a lance inserted and installed into the vertical baking furnaces 122 and 124. In addition, the combustion air supplier 54 supplies air from the upper side to the lower side inside the vertical firing furnaces 122 and 124 so that the COG is combusted.

That is, the fuel supplier 52 and the combustion air supplier 54 are configured as a pump capable of supplying COG and combustion air to the inside of the vertical firing furnaces 122 and 124, respectively, and adjusting the amount thereof.

The calorific value control unit 50 configured as described above is electrically connected to the control means 70 including the signal converter 72, the central controller 74, and the instrument controller 76, and the fuel supply 52. And the combustion air supplier 54 is electrically connected to the instrumentation controller 76.

In addition, the weighing unit 34 is connected to the signal converter 72, the electric valve and the like is electrically connected to the instrument controller 76.

Referring to the operation of the calorie control device 1 of the granular furnace according to the present invention configured as described above are as follows.

When the daily output of the quicklime to be produced in the granulating kilns 122 and 124 in the control means 70 is determined, the charge amount, the COG supply amount, and the combustion air supply amount of the limestone are determined.

As described above, when the charge amount, the COG supply amount, and the combustion air supply amount of the limestone are determined, an electric valve mounted on the limestone supply pipe 22 connected to the third screen 116 and an upper portion of the first basis weight hopper 18 are provided. The electric valve 19 installed in the opening is opened so that limestone supplied from the first and second flush raw stone storage hoppers 112 and 114 can be stored into the first basis weight hopper 18 through the third screen 116.

At this time, the limestone supplied to the third screen 116 by the feeders 112a and 114a installed at the lower portions of the first and second flush stone storage hoppers 112 and 114 is different by particle size as the third screen 116 is operated. Are classified.

That is, the limestone having a particle size of 10 mm or more by the third screen 116 is stored in the first basis weight hopper 18 through the limestone supply pipe 22 connected to the upper portion of the third screen 116 and the weight thereof is The first weighing device 20 detects the signal and sends the signal to the signal converter 72, and limestone having a particle size of 10 mm or less is stored in the main body of the third screen 116.

Subsequently, when the electric valve 21 installed below the first basis hopper 18 is opened to supply the limestone having a particle size of 10 mm or more to the particle size separator 12, the particle size separator 12 is operated to obtain the limestone. Is separated into 20mm or less, 20-45mm, and 45mm or more, which are stored in the main body of the particle size separator 12, the first and second limestone storage hoppers 14 and 16, respectively.

Limestone separated and stored by the particle size as described above is the basis weight hopper 32 as the electric valves (13, 14a, 16a) installed in the lower part of the particle size sorter (12), the first and second limestone storage hoppers (14, 16) are opened, respectively. The weight is measured by the weighing machine 34 installed at the bottom of the basis weight hopper 32 and then stored in the fixed hopper 118 installed at the top of the granular firing furnaces 122 and 124. It is charged into the interior of the vertical firing furnaces 122 and 124.

At this time, the weight signal for each particle size of the limestone measured by the weighing machine 34 is transmitted to the signal conversion unit 72.

As described above, the weight signal for each particle size of the limestone sent to the signal converter 72 is set to the calorie supply set value according to the weight ratio for each particle size of the limestone which is sent to the central controller 74 and corresponds to the fuel It will supply COG and combustion air.

That is, the central controller 74 controls the fuel supply 52 and the combustion air supply 56 by the instrumentation controller 76. In the present embodiment, the fuel supply 52 and the combustion air supply 56 are controlled. ) Are all composed of a pump, the instrument controller 76 is to adjust the current supply value to adjust the rotational speed.

On the other hand, when the sum of the weights of the limestone having a particle size of 20 mm or less and the limestone having a 20 to 45 mm is less than 10% of the total weight of the limestone charged and the weight ratio of the limestone having a particle size of 45 mm or more is close to 90%, it is supplied to the granular furnaces 122 and 124. The appropriate calorific value is 800-820 Kcal / kg-CaO.

This is the ideal weight ratio by weight of the limestone in the granular furnace (122,124), wherein the calorific value and calcining rate for the weight ratio of limestone by particle size is shown in Table 1.

From Table 1 and FIG. 6, it can be seen that the firing rate and the supply calorific value are Y (firing rate) = 0.0482X (supply calorific value) + 89.557.

On the other hand, if the weight ratio of the sum of the weight of the limestone having a particle size of 20 mm or less and the limestone having a particle size of 20 to 45 mm is close to 30% based on the total weight of the limestone, and the weight ratio of the limestone having a particle size of 45 mm or more is close to 70%, The heat supply value to be supplied to the granular kilns 122 and 124 is reduced to 30 Kcal / kg-CaO to 770 to 790 Kcal / kg-CaO.

This is to prevent the internal pressure of the granular calcining furnaces 122 and 124 from being increased because the weight ratio of the limestone is smaller than that of the ideal limestone. This is because limestone can be calcined with a relatively small amount of calories.

That is, when the weight ratio of limestone by particle size is as described above, the supply calorific value and the firing rate are shown in Table 2.

From Table 2 and FIG. 7, it can be seen that the firing rate and the supply calorific value have a relationship of Y (firing rate) = 0.0143X (calorie supply) + 89.61.

 In addition, if the sum of the sum of the weights of the limestone having a particle size of 20 mm or less and the limestone having a particle size of 20 to 45 mm is less than 2% based on the total weight of the limestone, and the weight ratio of the limestone having a particle size of 45 mm or more is close to 98% The heat supply value to be supplied to the granular kilns 122 and 124 is increased to 30 Kcal / kg-CaO to be 830 to 850 Kcal / kg-CaO.

This is because the calcining time and the calorific value of the calcined limestone of large size are included because the weight ratio of limestone by particle size is larger than the weight ratio of grain size of the ideal limestone.

On the other hand, when the weight ratio of limestone by particle size is as described above, the supply calorific value and the firing rate are shown in Table 3.

From Table 3 and FIG. 8, it can be seen that the firing rate and the supply calorific value are Y (firing rate) = 0.0464X (calorie supply) + 89.548 degrees.

That is, the sum of the weights of the limestone having a particle size of 20 mm or less and the limestone having a particle size of 20 to 45 mm is less than 2% based on the total weight of the limestone, and when the weight ratio of the limestone having a particle size of 45 mm or more is close to 98%, Calorie supply value to be supplied to (122,124) is 30Kcal / kg-CaO increased to 830 ~ 850Kcal / kg-CaO.

As described above, when changing the calorific value of the calcined calciner (122,124) in accordance with the weight ratio of the limestone particle size, the instrumentation within the range of ± 1% of the weight ratio of each particle size previously set for the weight ratio of the limestone The controller 76 automatically changes the amount of heat supplied.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

As described above, according to the present invention, the weight of limestone charged into the granular firing furnaces 122 and 124 is detected by particle size, and accordingly, the amount of limestone charged into the granular firing furnaces 122 and 124 is adjusted to adjust the amount of heat supplied to the granular firing furnaces 122 and 124. The effect of producing quicklime of uniform quality can be obtained by preventing this from being under-baked or unbaked.

Claims (3)

In the apparatus for producing quicklime by charging the limestone washed by the drum washer 106 into the granular firing furnace (122,124) through the first and second washing raw materials storage hopper (112,114), And a particle size sorter 12 installed to communicate with the lower first and second flush stone storage hoppers 112 and 114 and first and second limestone storage hoppers 14 and 16 installed to communicate with the particle size sorter 12. Particle size selection unit 10; Weight having a basis weight hopper 32 installed in communication with the bottom of the particle size separator 12 and the first and second limestone storage hoppers 14, 16 and a weighing machine 34 installed at the bottom of the basis weight hopper 32. Measuring unit 30; And A fuel supplier 52 for supplying fuel into the granular firing furnaces 122 and 124 in communication with the basis weight hopper 32 and a combustion air supplier 54 for supplying combustion air necessary for combustion of the fuel into the granular firing furnaces 122 and 124 Calorie control unit 50 provided with; Calorie control device for a vertical firing furnace comprising a. According to claim 1, wherein the basis weight hopper 32 is capable of measuring the weight of the limestone supplied into the basis weight hopper 32 from the particle size separator 12 and the first and second limestone storage hoppers (14, 16) Calorie control device for a vertical firing furnace, characterized in that seated on the top of the weighing instrument (34). According to claim 1, wherein the particle size selector 12 is calorie control device for a granular firing furnace, characterized in that a plurality of screens (12a, 12b) are installed so as to vertically overlap so as to select the particle size of the limestone in multiple .

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