DE2236981B2 - METHOD FOR DELETING COCKS - Google Patents

Description

The invention relates to a method for extinguishing coke, in which a coke lying on an extinguishing surface Coke bed is treated with extinguishing liquid applied from above.

Such a method is already known from GB-PS 8 27 023. In this known method, the extinguishing water is distributed over the glowing coke bed with the help of spray heads, the extinguishing water with With the help of the spray heads it is broken up into fine drops or partial jets.

This known method is disadvantageous in that a large part of the extinguishing water sprayed on by the rising steam is carried away, whereby extinguishing water is lost and the environment is severely affected Water vapor is contaminated. Despite the high level that cannot be avoided with the known method However, water consumption does not succeed in extinguishing the coke uniformly everywhere. It is usually a extensive manual deletion required. In particular, in deeper layers of the coke bed Areas of insufficiently quenched coke encountered. ·

From US-PS 32 94 107 a device for cooling hot strip is known in which the Cooling water from a large number of siphon pipes is applied to the warm rolling material. From the The cooling water emerges from the outlet openings of the siphon pipes in the form of laminar downdrafts which occur hit the rolling stock surface. The laminar jet hitting the rolling material spreads evenly

over the metal surface to ensure rapid and even cooling.

The invention is based on the object of creating a method of the type mentioned at the beginning, which in an economically advantageous and highly reliable way an even extinguishing of cooked coke permitted.

This object is achieved according to the invention in that the extinguishing liquid in the form of closed, spaced-apart rays impinging on the coke and penetrating the coke bed at least partially to the extinguishing surface in an amount of 8000 to 24,000 l / m ² per surface directly hit by the beam Minute is applied.

The advantage that can be achieved with the aid of the invention is primarily to be seen in the fact that very short erasing times from 1 to 3 minutes can be achieved, with an even erasure of the in these short periods of time Coke beds is achieved. In addition, over-moistening of the coke is avoided and becomes considerable Saving extinguishing water, which is with the extremely high water requirements of a modern coking plant in With regard to the increasing scarcity of groundwater from the point of view of environmental protection is of the utmost importance.

The method according to the invention is based on the main idea, the energy of closed extinguishing water jets to use consciously to penetrate the coke bed. The ones with considerable intervals in between Closed jets of extinguishing water that strike the bed of coke in a laminar manner are reduced in terms of their volume taking into account the respective coke bed thickness and the coke grain size chosen so that it covers the coke bed at least partially fogged up to the extinguishing surface. So only a part of each jet is raised in the coke bed scattered and evaporated on the way down by hitting the individual coke parts. The rest of everyone The jet reaches the extinguishing surface on which the water is distributed. This evaporates on the extinguishing surface Extinguishing water, which means that the "penetrated" water around the penetrating jet in Form of steam and entrained water particles flows upwards again and in the process leads to the extinguishing process contributes. In the English technical language is for the described behavior of the up to the extinguishing bed pad The expression "to percolate" is used for pounded water. According to an advantageous embodiment the invention provides that the extinguishing liquid only in a higher area of the Coke bed is applied in the form of closed beams.

It has also been found to be advantageous that on the lower-lying area of the coke bed Extinguishing liquid is sprayed on in a known manner.

As a device for carrying out the method according to the invention in the case of an extinguishing surface lying coke bed, a pipe system from which the extinguishing liquid is arranged above the coke bed emerges through spray pipes directed at the coke bed, has been found to be advantageous that the Spray pipes have a diameter of about 2.5 to 7.5 cm and one at least 3 times their diameter have the amount of length, the spray pipes at intervals of a maximum of 1.5 m, preferably 1.2 m, are arranged from each other.

It should be mentioned that the closed extinguishing water flows into the coke bed to a depth of about 2.5 m able to penetrate.

The invention is described below using exemplary embodiments with reference to the drawing described in more detail,! n this shows

Fig. I a for the implementation of the invention Extinguishing station suitable for the procedure,

FIG. 2 shows a section along the line; ie H-II in FIG. 1,

3 shows a cross section along the line III-III in Fig. 1,

4 shows a further embodiment of the Process explanatory representation,

F i g. 5 o an explanation of a further embodiment of the invention,

F i g. 6 shows an embodiment of a spray tube suitable for carrying out the invention,

7 shows a section through a spray tube according to FIG. 6 and

8 shows a schematic perspective illustration, in which the path of the extinguishing water through the coke bed is shown.

In the arrangement shown in Fig. 1 to 3 there is a rail 3 guided fire truck 1, which is filled with hot coke 2 to an average height of about 1 m, in the lower part one Extinguishing tower 4. This contains a pipe branch 6 on which a number of downwardly directed spray pipes 5 sits and which via a main line 7 with a (not shown) container for an extinguishing liquid connected is. As soon as the extinguishing vehicle 1 has moved into the extinguishing tower 4, the total extinguishing liquid 8 within about a minute the upper part of the on an inclined extinguishing surface 9 lying coke bed 2 supplied (Fig. 2). The coke 2 is completely extinguished within about a minute and then no longer contains any overheated areas where combustion can continue in the air could. The fire truck can then be rolled to a coke bunker (not shown), where the now a uniform moisture content of about 3 wt .-% having coke over a Outlet flap 10 is emptied. As can be seen from the illustration in FIG. 8 recognizes, penetrates the im upper part of the inclined coke bed supplied extinguishing liquid the bed to the base or Quenching surface 9 and flows downwards in the direction of the arrows on this, being in contact with coke that is still hot comes and then flows through it in the form of steam in the direction of the arrow. If necessary, a part occurs the liquid in the form of vapor through the surface of the coke bed and acts on the Walls of the extinguishing vehicle 1. Part of the liquid flows further downward on the inclined surface 9 and occurs under the flap 10 through.

In the arrangement shown in Figure 4, an extinguishing liquid 8 from a Kippbehäli 11 is on the The upper part of an inclined coke bed 2 is poured, penetrates the coke bed up to the quenching surface 9 and then traverses this upwards in accordance with the schematic representation in FIG. 8th. Optionally, but not necessarily, a number of spray nozzles 13 are provided, which the Spray the coke bed with the extinguishing liquid from above. In the further embodiment according to FIG. 5 will be the Extinguishing liquid 8 through a single tube 12 of large diameter to the upper or elevated part of the Coke beds supplied while the fire truck 1 is on the rails 3 in the direction of the arrow through the Extinguishing tower 4 moved through.

There are numerous possible arrangements of pipes or other systems for the supply of the Extinguishing liquid in such a way that it quickly penetrates the coke belt and then upwards in the form of a dump this flows through. In some cases the one shown in FIG. 6 ί ge / Eigie arrangement advantageous in which the outlet pipes 5 are attached to the top of the pipe branch 6. In such a training is a Clogging by coke dust or other particles of foreign matter penetrating into the pipes is avoided and thereby

in ensures that the liquid outlet from the Pipes takes place evenly and starts at the same time. One sufficient to penetrate the bed of coke However, there is also leakage of liquid in the case of the one shown in FIG. 7 arrangement shown guaranteed as long as the linear

r> length / of the spray pipe sitting on the branch pipe 6 5 is at least three times and preferably eight times the pipe diameter c /.

In a broader sense, the invention is in the quenching or quenching of hot, relatively porous

2ii material applicable, especially in the case of a material which requires a short extinguishing time to achieve a low moisture content, for example for extinguishing hot coke from a horizontal chamber coking furnace. The one discharged from such furnaces

Natural coke does not fall evenly on or into the fire engine and therefore does not form a coke bed of even thickness. Rather, the coke falls, which has a temperature of about 1000 to 1150 ⁰ C and a density of about 430 to 530 kg / m ¹ ,

in in irregular piles on the fire truck, like one in FIG. 8 sees. The method according to the invention is particularly applicable for this type of deletion, since the extinguishing liquid the coke belt in the form of diffusing currents quickly up to preferably

) "> penetrates an inclined floor surface on which it has a finds a closed, straight layer of coke that needs to be extinguished or cooled. With the current of the Liquid or its vapors up through the coke bed, this becomes uniform in its entirety, effectively and quickly deleted or cooled. If liquid occurs in a depression between two Piles of coke to the surface, so it splashes on the sides of the piles and extinguishes the one there coke present. However, if the liquid rises

• π within a pile of coke, it is practicing hers Extinguishing effect up to its apex. It is therefore essential for the method according to the invention that instead of the previous spraying, at least one liquid stream is used, which the coke bed largely able to penetrate. The feed devices, for example pipes, are like this to train that before the impingement of the liquid on the coke bed only the slightest possible dispersion the same results. The supply devices are to be designed in such a way that the extinguishing liquid is at Their fall from the outlet to the surface of the coke bed is not in any noteworthy degree Drops dissolve. Because of its surface tension, every liquid tends to fall into To dissolve a gas into individual drops, however, if the height of the fall is not excessively great, it will break down Electricity is negligible before it hits the bed of coke. In practice it has changed depending on the ratio from length to width of the spray tube and the flow velocity a height of fall of at most 3.6 m or better of less than about 1.8 m, preferably between 1.8 and 2.4 m as favorable proven. If the liquid leaks over

Spray pipe ^ with a width / length ratio of 1: 8 and with a pressure of 0.281 at in the branch pipe results in a drop height of 1.8 to 2.4 m satisfactory effectiveness.

In the extinguishing method according to the invention, the flows of the extinguishing liquid can be very deep Penetrate hot coke bed. For easier handling and most effective influencing of the remaining Moisture content, however, we recommend an average bed depth of 0.3 to 1.8 m, with about 2.4 m at the highest elevations. Preferably, however, the average delivery of the Koksbeüs is 0.3 to 0.9 m held, with about 1.4 m at the highest elevations.

The remaining moisture content in the coke is related to the length of time over which the extinguishing liquid is in contact with the hot coke, since the ^{coke, which has a density of 430 to 530 kg / m 3} , greedily absorbs the liquid. This is due to the fact that the gases filling its cavities contract as a result of the cooling. The resulting vacuum is then quickly filled by the liquid. The hot coke soaks up the extinguishing liquid when it is extinguished. In the case of the distribution of the extinguishing liquid that can be determined with the method according to the invention, however, extinguishing times of 45 seconds to 1.5 or even only 1 minute can be achieved without difficulty, while the conventional spraying method requires 1.5 to 3 minutes.

The mutual spacing of the extinguishing liquid flows can be an important factor in a coke bed with a large surface, for example in an extinguishing vehicle with a ^{floor area of about 56 in 2.} With such large surfaces, a stream penetrating the coke bed must be provided at least every 1.5 m in the longitudinal direction of the extinguishing vehicle. The distances between the downward currents should therefore not be more than 1.5 m. If, on the other hand, a stream stretched in the longitudinal direction according to the arrangement in FIG. 4 or a relatively moving stream according to FIG. 5 is used, a sufficiently large proportion of the extinguishing liquid reaches the inclined floor 9 and can then flow through the lower part of the coke bed. However, if individual pipes are only arranged over the upper half of the top surface, they should not be more than about 1.5 m apart, preferably even less than about 1.2 m apart.

An indispensable feature of the invention is that the extinguishing liquid is in the form of a stream or flood falls on the coke coke. As mentioned above, this is in contradiction to the known Teaching according to which water is sprayed in the form of relatively small droplets over the entire coke bed. this does not mean, however, that the invention is a combination of the wedge liquid flow through the coke bell through spraying the surface. According to one embodiment, in the upper lliilfle of the surface an the Koksbell penetrating and its lined half flowing liquid flow applied, while the liniere A relatively small amount of liquid wedge is sprayed onto the bed via conventional nozzles 13 (Fig. 4). In practice this is the spraying of the lower ones lliilfle of the coke hatchet is usually not necessary, there is a satisfactory extinguishing effect within approx 1 min with the sirömiing alone cr / ielen allowed. at particularly uneven surface of the coke bed can The handshake, however, turns out to be useful.

The outlet pressure of the liquid flow can increase

move within certain limits, but not pressures of more than about 0.56 at in the pipe branch are beneficial. At such a pressure or below

• the liquid penetrates sufficiently into the A coke bed, while at higher pressures there is a risk that the coke bed is moved excessively and coke particles are thrown out of the car.

A distributor pipe with a perforated wall isl

κι not suitable for the method according to the invention. In Cause the absence of any length of branch pipe to hold the liquid wedge flow together simple bores spray the liquid over the coke bed. In addition to the lengthways

ι ^r > continuous stream according to FIG. 4, arrangements are predominantly used in which one or more spray pipes extend from a pipe branch, the length of which is at least three times, but preferably eight times their diameter.

2 (i This means that a current can be created which is during the If more than about 1.8 m until it hits the Koksbell, only slightly divides.

The consumption of extinguishing liquid, usually water, is compared to the conventional method

2 ^r ) decreased. However, this fact is by far not as important as the fact that a consistently low moisture content of the slaked coke of 2 to 4% by weight can be achieved with the method according to the invention. The one added to the coke

in total water amount is usually about 1100 to 3000 l / t. For penetrating a bed of coke to a maximum depth of about 2.4 m at a time In conventional fire trucks, the ratio of the flow velocity to the entry area is decisive.

r> bend. In this context, the term "entry surface" means the surface directly acted upon by the flow of liquid. The flow impinges on the coke preferably in an amount of about 8,000 to 24,000 l / min per m ^{2 of} inlet area. According to unity

■ lo preferred embodiment of the invention is the entire extinguishing liquid or most of the same to the upper part, in particular the upper half of a Coke beds located on a fire truck with a sloping floor are supplied. Through this unconventional

• ti nclle and previously unknown procedures can be used excessive accumulation of water and flooding of coke in the area of the outlet valve and thus a Avoid oversaturation in this area. It is thus possible to extinguish the coke sufficiently by adding mar

in several streams on the upper half of the coke bed or a continuous stream of extinguishing liquid in the longitudinal direction with or without further additives Supplies liquid.

For laboratory tests with smaller amounts of coke

ii it was found that when using a spray nozzle groove little water gets to the coke below the top layer before the top layer approaches gcsätiigl isl. The top layer of coke 3 ( contain up to 50% moisture, while the lowest

wi layers still glow. In the inventive The supply of streams of the extinguishing liquid is dcmgc In comparison with the volume of water falling on part of the uppermost layer, it is so large that, due to its shortness, dci only a small amount of time available for this

ir, part of the existing water is absorbed in the uppermost strut and the remaining water quickly penetrates into the deeper layers.
To carry out experiments, 13, hk ^

Coal consisting of 75% gas-rich Pittsburgh coal and 25% low-gas Pocahontas coal in two 1100 ° C heated experimental pressure ovens introduced The resulting coke was discharged as a 1000 ° C. heat sensor arranged in the middle of the charge indicated. The result was about 9 kg of coke, which in a dump height of about 45 cm in a Expanded metal basket was filled. In another arrangement, about 18 kg of coke were at a height of filled about 90 cm. The baskets each had a base area of about 20 × 25 cm. The basket with that Hot coke was by means of spray nozzles and, according to the method according to the invention, by means of downpipes Water charged. The downpipe used was a 1 or 1/2 inch pipe with a length of about 15 cm, which was connected to a 200 l tin barrel. To control the flow there was one in each pipe Quick-acting valve provided. After aligning the basket containing the coke, the valve

10

15 opened and the water thus released access to the hot coke. The amount of water consumed was determined by measuring the water level in the barrel before and after the experiment. After adding a sufficient amount of water to extinguish the coke, the coke was allowed to drip off for 2 minutes. The 45 cm high coke was then divided into an upper part and a lower part, and the moisture content was determined for both parts. The coke poured 90 cm high was divided into four parts and the moisture content of the individual parts was determined. In some experiments the basket was moved back and forth under the water flow. In other experiments the water flow was again supplied intermittently. The experiments were carried out with one, two and four paddy eggs emerging from the bottom of the barrel. The results of the experiments are summarized in Table 1 below.

Table Ia

attempt Type of deletion pipe Pipe size basket number Break Duration each total No. number emotional supply between one supply going on Respectively supply duration (Case) (Spray) (Customs) (lake) (lake) (lake)

9
10
11
12th
13th
14th
15th
16
17th
18th
19th

Table Ib

F.
F.
F.
F.
F.
F.
F.
F.
S.
F.
F.
F.
F.
F.
F.
F.
S.
F.
F.

2
2
2
2
2
2
2
2
1
1
2
2
2
2
2
2
1
4th
4th

-1/2 -1/2

-1/2 -1/2

no

no

no

no

no

no

no

no

no

no

no

Yes

Yes

Yes

Yes

Yes

no

Yes

no 1 3 7 7 5 1 1 2 1 1 1 8 10 1 1 1 2 1 1

40

15th

10

10

15th

10

10

30th

12th

4 & 2 30 30 20

7 30

5 12

1
2
3
4th
5
6th
7th
8th
9
10
II

12th

12th

120

90

60

45

20th
30th
30th
20th

80

43.2 9.3 20.4 43.2 9.35 25.3 49.5 9.07 21.6 49.5 10.4 14.4 45.7 9.38 11.4 45.7 8.62 7.2 47 9.98 13.6 47 9.43 12.9 47 9.43 11.7 47 9.38 42.7 91.4 18.19 30.6

91.4

18.8

26.5

2000 11.4 / 6.4 2460 35.3 / 40.4 2160 50.0 / 54.9 1360 46.0 / 41.5 1086 39.8 / 31.8 719 0.59 / 0.46 1397 5.2 / 1.3 1240 10.7 / 9.6 1140 38.9 / 15.5 4017 33.3 / 42.7 3041 14.8 / 7.7 12.4 / 6.3 1286 50.0 / 44.4 51.3 / 32.2

12th

12th

14th

10 5 8 6

30th

30th

20th

16

10

60

12th

attempt total bed coke Amount of water Moisture above, By No. Time depth weight middle, below sectional humidity (lake) (cm) (kg) (1) (l / t) (%)

9.4 37.8 52.7 43.7 34.3

0.52

3.1 10.1 26.5 38.7

9.8

43.8

continuation

13 14 15 16 17 18 19

100 8 9 7

90

12th

10

attempt total bed coke Amount of water Moisture above, By No. Time depth weight middle, below sectional humidity (lake) (cm) (kg) (D (I / O (%)

101.6 18.55 17.8 91.4 18.1 14.4 91.4 18.82 36.4 91.4 1832 25.7 91.4 18.6 23.5 91.4 18.92 42.3 91.4 18.87 78.7

*) Coke not completely extinguished near the ground.

**) 15 cm high lower layer not deleted

***) Coke smaller in the lower half than in the upper half.

867 493 / 28.7 30.5 45.7 / 9.3 719 2.2 / 0.5 0.87) 1.3 / 0.0 1740 11.2 / 62 6.6 ") 73 / 3.5 1275 1.9 / 0.1 0.86 ") 1.0 / 0.0 1144 49.5 / 47.8 43.5 52.7 / 28.1 2021 4.9 / 0.1 2.0 ") 0.2 / 0.0 3904 13.9 / 17.1 15.0 11.9 / 17.1 ")

In the industrial application of the extinguishing process, an approximately 15 m long and 3.6 m wide fire engine with a floor sloping from the loading side to the outlet side at an angle of 30 °, on which a coke bed with an average thickness of about 0.45 m lies, pushed into an extinguishing tower. The horizontal surface of the car is about 54 m ² . In the longitudinal direction of the car are four rows of 1/2 inch outlet pipes, each spaced about 1.05 m apart, about 1.8 m above the elevated one. Side or half of the coke bed arranged. About 1470 l / min of extinguishing water per m ^{2 of} inlet area are fed through this until the total amount has reached about 18 900 l. The truckload of coke is completely extinguished in one minute and can be emptied into the coke bunker after two minutes without the risk of continuing to glow.

For this purpose 3 sheets of drawings

Claims (4)

Patent claims: 1. A method for extinguishing coke, in which a coke bed lying on an extinguishing surface is treated with extinguishing liquid applied from above, characterized in that the extinguishing liquid impinging on the coke at intervals, the coke bed at least partially up to the extinguishing surface penetrating rays in an amount of 8000 to 24,000 l / m ^{2 is applied} directly by the area hit by the jet per minute. 2. The method according to claim 1, wherein the coke bed lies on an inclined quenching surface, characterized in that the extinguishing liquid only in a higher lying area of the coke bed is applied in the form of closed rays. 3. The method according to claim 2, characterized in that the lower area of the Coke bed extinguishing liquid is sprayed on in a known manner. 4. Device for extinguishing coke for performing the method according to one of claims 1 to 3, with an extinguishing surface on which a coke bed lies, and with a pipe system arranged above the coke bed, from which the extinguishing liquid exits through spray pipes directed at the coke bed, characterized in that the spray pipes (5) have a diameter of approx. 2.5 to 7.5 cm and a length (I) which is at least 3 times their diameter (d) and at intervals of a maximum of 1.5, preferably 1, 2 m from each other.