JP5942488B2 - Coal charging method for coke oven charging vehicle - Google Patents

Description

  The present invention relates to a method for charging coal in a coke oven charging vehicle.

  In general, a coke oven has a structure in which a plurality of carbonization chambers for carbonizing coal to coke and combustion chambers for burning fuel gas and combustion air are alternately arranged. In order to charge coal into the carbonization chamber, a coke oven charging vehicle (coke oven charging vehicle) is used.

  FIG. 1 is a cross-sectional view showing a general carbonization chamber and a coke oven charging vehicle. The carbonization chamber 10 includes a coal charging inlet 4, a gas rising pipe 7 and a bend portion 12, and a dry main 8. The coke oven charging vehicle 11 includes a plurality of coal hoppers 1 (here, four hoppers 1A, 1B, 1C, and 1D), a feeder 2, and a charging unit disposed in the longitudinal direction of the carbonization chamber. A hood 3 and a furnace top cleaner 9 are provided. In FIG. 1, 5 is coal, and 6 is furnace gas.

  Conventionally, when the coal 5 is charged into the carbonization chamber 10 from the coke oven charging vehicle 11 during the operation of the coke oven, as shown in FIG. 2, the hopper 1 (1A to 1D) of the coke oven charging vehicle 11 is used. The coals 5 mounted on the feeders are cut out from the feeders 2 at the same time, or as described in Patent Document 1, from the hoppers 1 (1A to 1D) one by one from the feeders 2 in order in the longitudinal direction of the carbonization chambers 10. Then, it is divided into four times and cut out, and charged into the carbonization chamber 10 continuously from each charging port 4 via each charging hood 3.

  At that time, the charged coal 5 suddenly rises in contact with the high-temperature furnace wall, and the gas 6 in the furnace (water vapor due to moisture adhering to the coal 5 or volatile gas decomposed by the coal) and dust 13 Is generated in large quantities, and the pressure in the carbonization chamber 10 increases. Therefore, during the charging of the coal 5, high pressure water is injected to the bend 12 and the dry main 8 of the gas riser 7, and the dust 13 and the furnace gas 6 are sucked by the ejector effect (suction effect by negative pressure). Thus, the in-furnace gas 6 accompanied by red hot dust is suppressed from being ejected from each inlet 4 remarkably. In the coke oven charging vehicle 11, the in-furnace gas 6 accompanied by red dust discharged from each inlet 4 is collected from the charging hood 3. In this way, the furnace gas 6 accompanied by red hot dust is prevented from leaking from the respective inlets 4 during the charging of the coal 5 to the furnace top or the surrounding environment.

  Patent Document 1 describes a split coal charging method in which coal 5 is divided into a plurality of times when coal 5 is charged into the carbonization chamber 10 from the coke oven charging vehicle 11. . This split coal loading method is a method applied only at the beginning of the coke oven startup. When a large amount of coal 5 is introduced into the carbonization chamber 10 when the furnace is started up, a large amount of water vapor and gas is generated, and at the same time, the pressure in the carbonization chamber 10 increases. Therefore, the pressure for controlling the pressure inside the furnace ahead of the dry main 8 is controlled. The control valve suddenly opens and closes, and there is a case where air is sucked from the outside of the carbonization chamber 10 through the dry main 8, and when the air is sucked, the coke oven explodes by reacting with the dust 13 and the gas 6. There is danger. Therefore, in Patent Document 1, for the purpose of preventing this explosion, the injection of high-pressure safe water in the dry main 8 is stopped to prevent negative pressure, and each feeder from the hopper 1 of 1A to 1D in FIG. The coal 5 is charged into the carbonization chamber 10 at least four times so as to cut out from 2, and the internal pressure of the dry main 8 following the carbonization chamber 10 and the gas riser pipe 7 and its bend portion 12 is gradually increased. By doing so, the sudden opening and closing operation of the pressure control valve is avoided, and the intake of air from the outside is prevented.

JP 2007-45929 A

  However, in the conventional coal charging method during operation of the coke oven as shown in FIG. 2, in the case of coal with high water content or high volatile content, a larger amount of steam or volatile gas than usual is generated, The leakage of the in-furnace gas 6 from each of the inlets 4 cannot be prevented, and the in-furnace gas 6 with red hot dust leaks out of the inlets 4 to deteriorate the environment at the top of the coke oven. There was a problem of letting.

  Therefore, in order to deal with the problem, while the coke oven was in operation, the method used only at the beginning of the coke oven startup described in Patent Document 1 was applied. Therefore, the in-furnace gas 6 generated when charging the coal 5 cannot be sufficiently sucked by the dry main 8, and as a result, the in-furnace gas 6 instantaneously fills the carbonization chamber and the coal charging inlet 4. The in-furnace gas 6 accompanied by red hot dust was ejected from the coke oven, and the coke oven top environment remained deteriorated.

  In addition, as described in Patent Document 1, coal to be charged into one carbonization chamber was divided into four times and cut one by one from the hoppers 1A to 1D. (Steam or volatile gas) 6 is generated in large quantities, and the dry main 8 that has stopped high-pressure dewatering cannot suck the furnace gas 6, so the furnace gas 6 with red hot dust explodes from the coal inlet 4. It was blown out and deteriorated not only to the top of the coke oven but also to the surrounding environment. Furthermore, since the coal 5 was charged in four times, the charging time was increased and the operation efficiency of the coke oven was significantly reduced.

  The present invention has been made in view of the circumstances as described above, and when coal is charged into a carbonization chamber from a coke oven charging vehicle during operation of the coke oven, coal having a high water content or coal having a high volatile content. Even in this case, the purpose of the present invention is to provide a coal charging method for a coke oven charging vehicle that can accurately prevent the gas in the furnace accompanied by red hot dust from being discharged from the coal charging inlet. is there.

  In order to solve the above-mentioned problems, the present inventors have paid attention to a high-temperature furnace wall that causes generation of a large amount of water vapor and volatile gas when a large amount of coal is charged. As a result, it was understood that the radiant heat from the furnace wall had the most influence on the generation of water vapor and volatile gas from the charged coal. If this radiant heat can be cut off, water vapor and volatile gas from the charged coal can be suppressed, and in-furnace gas accompanied by red hot dust from the coal charging inlet can be prevented from leaking to the top of the furnace.

  Therefore, it was decided to utilize the dust generated at the time of coal charging as a means to block the radiant heat from the furnace wall. When a large amount of coal divided into four times per carbonization chamber is charged, a large amount of water vapor and volatile gas is generated. It was found that there is a blocking effect. It should be noted that the charging of a very small amount of coal may be performed only once, and it takes time if divided into a plurality of times, which reduces the operation efficiency of the coke oven, which is a problem.

  The present invention is based on the above findings and has the following characteristics.

  [1] When charging coal into the carbonization chamber from a coke oven charging vehicle during operation of the coke oven, high pressured low-pressure water is injected into the gas riser bend or dry main of the coke oven, In advance, a small amount of coal is charged into the carbonization chamber at one time from one or more hoppers of a coke oven charging vehicle as a preliminary coal charge, and after a certain period of time, the remaining large amount of coal as a full charge A coal charging method for a coke oven charging vehicle, characterized in that the coal is charged in a two-stage coal charging, wherein the coal is charged into the carbonization chamber.

  [2] When a very small amount of coal is charged into a carbonization chamber at a time from one or a plurality of hoppers of a coke oven charging vehicle as a pre-coal for one carbonization chamber, The coal charging method for a coke oven charging vehicle according to the above [1], wherein a very small amount of coal in the range of 1/200 to 1/50 in terms of the weight ratio to the total amount of coal to be charged to the coal is charged. .

  [3] For each carbonization chamber, a very small amount of coal is preliminarily charged as a preliminary coal from one or more hoppers of a coke oven charging vehicle into the carbonization chamber at a time for 15 to 30 seconds. Coal charging of the coke oven charging vehicle according to the above [1] or [2], wherein a large amount of remaining coal is charged into the carbonization chamber as full-fledged charging after a certain period of time. Method.

  In the present invention, when charging coal into the carbonization chamber from the coke oven charging vehicle during operation of the coke oven, one carbonization is performed while injecting high-pressure water into the gas riser bend or dry main of the coke oven. Pre-charge a very small amount of coal from one or more hoppers of the coke oven charging vehicle into the carbonization chamber once in a room, and after a certain period of time, the remaining large amount of coal is put into the carbonization chamber. Since it is charged, dust generated from a very small amount of coal charged in advance fills the carbonization chamber during a certain period of time and blocks the radiant heat in the carbonization chamber. Since the rapid rise in temperature of coal charged at the stage of charging a large amount of coal into the carbonization chamber is mitigated, generation of water vapor and volatile gases occurs even in the case of coal with high water content and high volatile content. Reduced amount of red dust from coal charging entrance It prevents the gases associated with leaks, so the furnace top environmental coke oven is remarkably improved.

It is a figure which shows sectional drawing of the carbonization chamber and coke oven charging vehicle of the common coke oven before coal charge. It is a figure which shows the conventional coal charging method. It is a figure which shows one Embodiment of this invention. It is a figure which shows one Embodiment of this invention.

  An embodiment of the present invention will be described with reference to the drawings. Here, the carbonization chamber 10 and the coke oven charging vehicle 11 shown in FIG. 1 are assumed.

  In one embodiment of the present invention, when charging coal 5 having a weight W for each carbonization chamber 10 from the coke oven charging vehicle 11 during operation of the coke oven, the bend portion 12 or the dry main of the gas riser pipe 7 is used. As shown in FIG. 3, a very small amount of coal (weight ΔW) is carbonized at a time from the hopper 1 </ b> A of the coke oven charging vehicle 11 in advance for each carbonization chamber 10 while injecting high-pressure water into 8. After charging into the chamber 10 and leaving a fixed time Δt, as shown in FIG. 4, the remaining large amount of coal (weight W−ΔW) is continuously charged into the carbonization chamber 10 from the hoppers 1 </ b> A to 1 </ b> D. That is, a pre-coaling stage in which a very small amount of coal is charged into the carbonization chamber 10 at a time while injecting high-pressure water into the bend portion 12 or the dry main 8 of the gas riser pipe 7 and the remaining after a certain time. A large amount of coal is continuously charged into the carbonization chamber 10 to perform a two-stage coal charging with a full-scale coal charging stage.

  Thereby, the dust 13 generated from a very small amount of coal charged in the preliminary coal charging stage fills the carbonization chamber 10 during a certain time Δt and blocks radiant heat from the furnace wall in the carbonization chamber 10, After that, in the full-scale coal charging stage where a large amount of remaining coal is charged, the rapid increase in temperature of the coal 5 is alleviated, and even if the coal has a high water content or a high volatile content, As a result, the gas with red hot dust does not leak from the coal inlet 4 and the top environment of the coke oven is remarkably improved.

  In addition, when charging a very small amount of coal into the carbonization chamber 10, it is necessary to inject high-pressure water into the bend portion 12 or the dry main 8 of the gas riser 7.

  By the injection of high-pressure safe water, water vapor and volatile gas in the carbonization chamber 10 are absorbed from the gas riser pipe 7 and the dry main 8, and accordingly, dust 13 generated from a very small amount of coal is one of the carbonization chamber 10. This is because the diffusive dust 13 can advantageously block the radiant heat from the furnace wall.

  In addition, the charging amount (weight ΔW) of the coal charged into each carbonization chamber 10 in the preliminary charging stage is a weight ratio with respect to the total charging amount (weight W) of the coal charged into each carbonization chamber 10. The optimum ΔW / W is 1/200 to 1/50 (that is, 0.5% to 2%). When the coal charging amount ΔW in the preliminary coal charging stage is less than 1/200 by weight, the amount of dust in the carbonization chamber 10 is insufficient, and the effect of blocking radiant heat from the furnace wall is small. Further, when the coal charging amount ΔW in the preliminary coal charging stage exceeds 1/50 by weight, there is a risk that dust is frequently generated and gas accompanied by red hot dust leaks from the coal charging inlet 4.

  Further, the time (stand time) Δt from the end of preliminary coal charging to the start of full-scale coal charging is preferably in the range of 15 seconds to 30 seconds. If the standing time Δt is less than 15 seconds, dust cannot fill the entire carbonization chamber 10 when coal is charged in the preliminary coal charging stage, and the effect of blocking radiant heat from the furnace wall is reduced. When the standing time Δt exceeds 30 seconds, it is not preferable because the operation efficiency of the coke oven is lowered, and further, the problem that the dust filled in the carbonization chamber 10 settles down by gravity and the effect of blocking the radiant heat from the furnace wall is lowered. is there.

  Here, the number of hoppers 1 is four, that is, hoppers 1A to 1D, but is not limited thereto. In addition, here, preliminary coal preparation is performed from the hopper 1A farthest from the gas riser 7. However, the present invention is not limited thereto, and preliminary coal preparation may be performed from another hopper or a plurality of hoppers.

  As an example of the present invention, coal was charged during coke oven operation for the carbonization chamber 10 and the coke oven charging vehicle 11 shown in FIG.

  In that case, as Example 1-10 of this invention, charging of coal was implemented based on one Embodiment of said this invention. That is, a preliminary coal charging stage in which a small amount of coal ΔW is charged into the carbonization chamber 10 once in advance while injecting high-pressure dewatering into the bend portion 12 or the dry main 8 of the gas riser pipe 7 and the remaining after the standing time Δt. A large amount of coal W-ΔW was continuously charged into the carbonization chamber 10 and the coal was charged in a two-stage coal charging stage with a full-scale coal charging stage.

  For comparison, as Conventional Example 1, coal was charged using the conventional coal charging method shown in FIG. That is, a large amount of coal W was continuously charged (in one time) into the carbonization chamber 10 while high-pressure water was injected into the bend portion 12 of the gas rising pipe 7.

  Furthermore, as the conventional example 2, the method of using only the initial stage of the coke oven start-up described in Patent Document 1 described above was applied, and coal was charged. That is, a large amount of coal W is supplied to the carbonization chamber 10 in the order of the hoppers 1A to 1D four times as illustrated in FIG. 2 while stopping the injection of the high-pressure safe water into the bend portion 12 of the gas riser 7 and the dry main 8. It was divided and charged.

  Table 1 shows detailed implementation conditions and results of Examples 1 to 10 of the present invention and Conventional Examples 1 and 2.

  As a result, first, in the conventional example 1 (No. 11), the temperature of the charged coal 5 is remarkably increased, a large amount of water vapor and volatile gas is generated, and the in-furnace gas accompanied by red dust from the coal charging inlet 4. 6 leaked and the top environment of the coke oven deteriorated as in the past.

  Further, in Conventional Example 2 (No. 12), the temperature of the charged coal 5 suddenly increased, a large amount of water vapor and volatile gas was generated, and the injection of high-pressure safe water was stopped. Since the gas 6 cannot be sucked by the gas rising pipe 7 and the bend section 12 and the dry main 8 that follow, the steam, volatile gas, and red dust are explosively leaked from the coal inlet 4, and the top of the coke oven Not only did it worsen to the surrounding environment.

  On the other hand, in Invention Examples 1 to 10 (No. 1 to No. 10), dust generated from a small amount of coal ΔW charged in the preliminary coal charging stage fills the carbonization chamber 10 and the carbonization chamber 10. In the full-scale coal-filling stage in which the radiant heat from the furnace wall is cut off and Δt is added to the remaining large amount of coal W-ΔW, the rapid temperature rise of coal 5 is mitigated, and a large amount of water vapor and volatile gas is generated. Is suppressed, and the in-furnace gas 6 accompanied by red dust from the coal inlet 4 is prevented from leaking, and the top environment of the coke oven is greatly improved.

  In particular, as in Invention Examples 1 to 6 (Nos. 1 to 6), a small amount of coal charging amount ΔW with respect to the total coal charging amount W is 1/200 to 1/50 in a weight ratio ΔW / W. Assuming that the standing time Δt after charging a small amount of coal is 15 to 30 seconds, the top environment of the coke oven was remarkably good.

DESCRIPTION OF SYMBOLS 1, 1A-1D Coal hopper 2 Feeder 3 Charging hood 4 Coal charging inlet 5 Charging coal 6 Furnace gas 7 Gas riser 8 Dry main 9 Furnace top cleaner 10 Carbonization chamber 11 Coke oven charging car 12 Gas riser bend Part 13 Dust

Claims (1)

When charging coal into the carbonization chamber from the coke oven charging vehicle during operation of the coke oven, high-pressure water is injected into the gas riser bend or dry main of the coke oven, As pre-coaling, coal in the range of 1/200 to 1/50 by weight ratio with respect to the total amount of coal from one or more hoppers of the coke oven charging vehicle is charged into the carbonization chamber at a time, 15 seconds to 30 After a period of seconds, the remaining large amount of coal is charged into the carbonization chamber as full-fledged coal. How to enter.

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