JPS63273695A - Dust collector of charging car for coke oven - Google Patents

Abstract

PURPOSE:To make combustion constant and to completely eliminate danger of explosion, by circumferentially equipping a dust collector of charging car with a specific gas housing and setting an air inlet, igniter, etc., on the side of a dust collecting hood. CONSTITUTION:In a dust collector 9 of charging car for a coke oven 1 wherein the surroundings of a coke charging column 15 are covered with a dust collecting hood 8 to prevent smoking in coal charging, a gas housing 19 having bored plural gas feed holes 17 at the bottom and a bored gas blow nozzle 18 at the top is circumferentially laid at the lower part of the coal charging column 15, plural air inlets 20 are bored at the bottom of the dust collecting hood 8, an igniter 21 is set on the side of the dust collecting hood 8 and opposingly to the gas blow nozzle 18 so that combustion of jetted gas can be always maintained against variability of irregular amount of gas generated in coal charging process and danger of explosion in the system can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a charging car dust collector for collecting dust-containing gas generated from a charging hole when charging coal into a coke oven. It is something.

"Prior Art" FIG. 4 is a cross-sectional explanatory diagram of a coke oven at the initial stage of coal charging and the φ stage, and FIG. 5 is a cross-sectional explanatory diagram of the coke oven at the final stage of coal charging.

As shown in both drawings, when charging coal 2 into a coke oven 1, the gas inside the furnace is replaced by the charged material, the moisture brought in by the coal, and the mixed gas such as coal gas. (hereinafter referred to as coal charging special gas 3) is generated.

Since this gas 3 generated during coal charging has a yellowish-black color and contains falling pulverized coal, conventional gas treatment methods include a part of it being transferred to a dry main 5 using a riser ejector 4.
A commonly used method is to use a charging vehicle dust collector 9 to suck gas ejected from the charging hole 6 through a dust collecting hood 8 equipped on the charging vehicle 7.

In addition, since the gas 3 generated during coal charging is a flammable gas containing hydrogen, methane, carbon oxide, etc., the charging car dust collector 9 contains
A combustion boundary system in which a combustion boundary device W10 is installed in the dust collection system (for example, Japanese Patent Application Laid-open No. 49-9502) and a dilution system in which a large amount of air is sucked from the hood to avoid the explosion limit of the generated gas (for example, in Japanese Unexamined Japanese Patent Publication No. 49-9502), 48-41845) and a method of filling the system with inert gas in an emergency (for example, Japanese Patent Application Laid-Open No. 56-112
No. 986) and other techniques that take various explosion prevention measures have been disclosed.

"Problems to be solved by the invention" The most difficult problem when designing the charging vehicle dust collector 9 is:
The problem is that the amount of gas ejected from the charging hole 6 varies significantly during the coal charging operation.

That is, from the initial stage to the middle stage of charging, as shown in FIG. 4, the amount of coal 2 in the furnace is small and the gas passage in the upper part of the furnace is secured, so the suction effect of the riser pipe ejector 4 is large, and the charging hole 6 is The amount of gas 3 emitted during coal charging is relatively small.

However, at the end of charging, the 51st! ! As shown in H, since the gas passage becomes narrow and the leveling work is performed by the leveler 11, the suction effect by the riser ejector 4 is extremely reduced, and the amount of gas generated from the charging hole 6 rapidly increases.

Furthermore, if there are variations in the falling speed of coal from the plurality of charging holes 6, the gas passage is often completely blocked by the accumulated coal as in the case of the charging hole 6a.

When such a situation occurs, the entire amount of gas generated in the furnace on the side opposite to the upper tube from the charging hole 6a will be blown out from the charging hole 6 on the side opposite to the riser tube from the charging hole 6a. become.

Since this phenomenon occurs depending on the properties of the coal and the characteristics of the equipment, it is extremely difficult to predict when and in which charging hole 6 it will occur and how much it will occur.

Therefore, charging car dust collector ii! 9, the amount of gas generated during coal charging 3 to be treated is often designed with the maximum amount of gas generated as a prerequisite, even though the amount of gas 3 generated during coal charging is a prerequisite. be.

First, the problems with the combustion type dust collector disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 49-9502 will be explained with reference to FIG.

Since the amount of combustion air blown is usually constant, the gas concentration changes as the amount of generated gas changes (between points a and d).

Air blower I that provides an appropriate air ratio for the maximum amount of gas generated
When operating at IA, when the amount of gas generated falls below point b, it falls below the lower explosive limit concentration C and combustion will no longer continue.

In addition, when operating with air blowing 11B commensurate with the average amount of gas generated, when the amount of gas generated exceeds the 0 point, it exceeds the upper limit explosion concentration and combustion will not continue.

Theoretically, it is possible to create ideal combustion conditions by controlling the amount of combustion air in response to fluctuations in the amount of gas generated, but as mentioned above, there is no practical way to accurately predict fluctuations in the amount of gas generated. Since there is no technology, it is extremely difficult to completely eliminate explosions.

Further, a problem with the dilution type dust collector disclosed in the above-mentioned Japanese Utility Model Publication No. 48-41845 is that the required suction air volume is large.

Diluting the generated gas concentration to below the lower explosive limit with a large amount of air is an effective means of explosion prevention, but the amount of air for dilution is required to be 5 to 20 times the amount of generated gas. Therefore, there is a drawback that the dust collector must also be large.

In addition, the inert gas blowing method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 56-112986 is effective as an emergency measure in case of trouble with the dust collector, but when used during normal operation, it costs a lot of money. This is uneconomical as it requires extra.

The present invention aims to solve such conventional problems.

Therefore, it was assumed that the cause of the explosion phenomenon in dust collectors using the combustion method was due to fluctuations in the amount of gas generated as described above, so we conducted tests using the dilution method instead. It was found that the frequency of explosions was drastically reduced even when the suction air volume was significantly lower than the required air volume.

At the same time, many phenomena were observed in which the gas ejected from the charging hole burned around the charging hole due to spontaneous ignition, and this was thought to be the main reason for the decrease in explosions despite the low air volume.

From this test result, we got a hint that if combustion could be maintained at all times even when the amount of gas generated fluctuates, it would be possible to collect dust from charging vehicles without explosions with low air volume, which led to the invention of the present invention. It is something that

``Means for Solving the Problems'' The present invention provides a charging car dust collector for a coke oven that surrounds a coal charging cylinder with a dust collection hood to prevent smoke generation during coal charging. A gas storage box having a gas inlet and a gas blowing nozzle protruding from the upper part is installed around the bottom of the coal charging tube, and a plurality of air storage boxes are installed at the bottom of a dust collection hood surrounding the coal charging tube. The present invention is characterized in that an inlet is bored and an ignition device is disposed opposite the gas blowing nozzle from the side surface of the dust collecting hood.

"Function" By guiding the generated gas to the gas storage box and igniting it, a small amount of generated gas is ignited and burned, forming a small flame at the tip of the gas blowing nozzle, and the amount of generated gas increases and can no longer be stored in the gas storage box. When a large amount of gas blows out from the gap between the bottom surface of the gas storage box and the charging hole frame using the small flame of the gas blowing nozzle as the ignition source, it burns and forms a large flame inside the hood, causing the amount of gas generated to fluctuate. It can continue to burn at all times.

"Example" Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an explanatory longitudinal cross-sectional view of the vicinity of the charging hole when the charging car dust collector according to the present invention is installed in the charging hole of a coke oven, and FIG.
The figure is an enlarged view of the vicinity of the gas storage box in the first embodiment, and FIG. 3 is a sectional view taken along the line X--X in FIG. 1.

In the drawing, 12 is a coal charging chute connected below the lower hopper 13 of the charging car 7, and 14 is a fixed hood fixed to the upper end of the coal charging chute 12.

Reference numeral 15 denotes a coal charging cylinder, which is integrated by a dust collection hood 8 provided on the outside and a joint material 16, and whose upper part is loosely connected to the coal charging chute 12 and fixed hood 14 (externally installed, not shown). The structure is such that the hood can be raised and lowered using a hood lifting device.

A gas storage box 19 having a plurality of gas inlets 17 and at least one gas blowing nozzle 18 is provided around the lower part of the coal charging tube 15 .

Further, a plurality of air inlets are provided in the lower part of the dust collecting hood 8, and a known ignition device 21 is installed from the side of the dust collecting hood 8 facing the gas blowing nozzle 18.

Furthermore, a packing 22 is provided on the outside of the lower surface of the gas storage box 12.
is attached.

The operation of the charging vehicle dust collector 9 of the present invention configured as described above will be explained.

When the charging car 7 loaded with coal arrives at the designated window of the coke oven 1, the charging hole cover (not shown) is removed by a lid removal device (not shown), and the charging car dust collector is removed. 9, the dust collecting hood 8 and the coal charging cylinder 15 are moved to the coke oven top 1a and the charging hole frame 23, respectively, by a hood lifting device (not shown).
The preparation for coal charging is completed by lowering the coal until it comes into close contact with the coal.

Then, when the coal supply device (not shown) is started, the coal 2 falls through the coal charging chute 12 and the coal charging tube 15 and is charged into the coke oven 1 through the charging hole 6.

Part or all of the gas 3 generated during coal charging is ejected out of the furnace from the charging hole 6 during the coal charging operation.

At the initial stage of coal charging when the amount of gas ejected is small, the entire amount of ejected gas enters the gas storage box 19 from the gas inlet 17 and then ejects from the gas blowing nozzle 18, and is ignited by a known ignition device 21 to form a small flame 24. and burn.

The ignition device 21 can be started automatically, for example, by a limit switch (not shown) for detecting the lower limit of the hood 8.

Incidentally, since the time required for one coal charging time is as short as about 2 to 3 minutes, it is better to keep the ignition device 21 open during the coal charging time in order to prevent an accidental misfire.

Regarding the air inlet 20, when the amount of gas generated is small, there is a risk that the small flame 24 at the tip of the gas blowing nozzle 18 may be blown out, so as shown in FIG. It is preferable not to drill into the hole.

The dust collection hood 8, coal charging tube 15, and gas storage box 19 have some play between them and the lifting device (not shown) for raising and lowering them. The structure is such that the space between the charging hole frame 23 and the gas storage box 19 is sealed, but the relative positions of the coke oven top 1a, the charging hole frame 23, and the gas storage box 19 are subject to installation errors. Complete sealing is difficult due to manufacturing errors and manufacturing errors, and there is usually a slight gap.

The amount of gas generated in the furnace increases, and the gas that can no longer be stored in the gas storage box 19 begins to blow out into the dust collection hood 8 through the gap.

When the amount of this ejected gas further increases and the gas inside the dust collection hood 8 reaches a flammable concentration, the small flame 24 formed at the tip of the gas blowing nozzle 18 becomes an ignition source, and a large flame 25 is formed. Ru.

Further, when the amount of gas ejected from the gap decreases and the gas inside the dust collecting hood 8 reaches the lower limit concentration of flammability, the large flame 25 inside the dust collecting hood 8 will misfire, but the tip of the gas blowing nozzle 18 The small flame 24 continues to burn.

In this way, the gas 3 ejected from the charging hole 6 during coal charging can always continue to burn stably even in the face of irregular fluctuations in the amount of gas generated during the coal charging process, and there is no longer any risk of explosion. It is led to the dust collection duct 26 as non-hazardous combustion exhaust gas and is disposed of in an arbor.

When the coal loading is completed and the coal supply is stopped, the dust collection hood 8,
The coal charging tube 15 rises, and the charging vehicle 7 moves to the next designated kiln.

"Effects of the Invention" As stated above, if the charging car dust collector of the present invention is used to collect dust from a coke oven charging car, irregular fluctuations in the amount of gas generated during the coal charging process will occur. Since the combustion of the ejected gas can be maintained at all times, it is possible to completely eliminate the risk of explosion within the dust collector system, from the dust collection duct to the dust collector itself, enabling safe operation. .

In addition, when collecting dust using the dust collector of the present invention, the required arbor air volume may be 2 to 5 times the amount of generated gas, and the required arbor air volume (5 to 20 times the amount of generated gas) depending on the dilution method. In comparison, 〃~χ, which makes it possible to collect dust with a small dust collector.

Further, since the dust collector of the present invention relates to the structure around the dust collection hood and the coal charging cylinder, it can be easily applied to an existing coal charging vehicle with a slight modification.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view of the vicinity of the charging hole when the charging car dust collector according to the present invention is installed in the charging hole of a coke oven, and FIG.
The figure is an enlarged view of the vicinity of the gas storage box in Fig. 1, Fig. 3 is a sectional view taken along the line X-X in Fig. 1, and Fig. 4 is an explanatory cross-sectional view of the coke oven at the early and middle stages of coal charging. FIG. 5 is a cross-sectional explanatory diagram of the coke oven at the final stage of coal charging, and FIG. 6 is a diagram showing the relationship between the amount of gas generated and the gas concentration. l... Coke oven 2... Coal 3... Gas generated during coal charging 4... Riser pipe ejector 5... Dry main 6... Charging hole 7... Charging car 8... ...Dust collecting hood 9...Charging vehicle dust collector lO...Combustion device 11...Leveler 12...Coal charging chute 13...Lower hopper 14...Fixed hood IS... Coal charging tube 16...joint material 17...gas inlet 18...gas blowing nozzle 19...gas storage box 20...air inlet 21...ignition device 22...packing 23 ...Charging hole frame 24...Small flame 25...Large flame 26...Dust collection duct Figure 2 Figure 3 Figure 6 Go Epps view

Claims (1)

[Claims] In a coke oven charging car dust collector, which surrounds the coal charging tube with a dust collection hood to prevent smoke generation during coal charging, multiple gas inlets are drilled on the bottom surface and a gas blowing nozzle is inserted into the top. A gas storage box is provided around the lower part of the coal charging tube, and a plurality of air inlets are bored in the lower part of a dust collection hood surrounding the coal charging tube, and a side surface of the dust collection hood is provided. A charging car dust collector for a coke oven, characterized in that an ignition device is disposed opposite the gas blowing nozzle.