JPS58145780A - Dry coke cooling process and device therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry coke cooling method carried out using cooling scum containing some water vapor and an apparatus for carrying out the method.

The dry coke cooling process has been known for several decades, and it involves cooling scorching coke taken from a coke oven into a tuff tube.
- and is cooled by inert gas flowing upward therein.

That is, such a tact-type cooling device operates on the principle of a movable fixed bed in which direct heat exchange occurs between solids and waste that are in a countercurrent state to each other, and the high temperature to exterminate the insects. The inert sludge is usually used to generate steam using water tube boilers. For example, German Published Patent Application No. 2853299 discloses a one-stage coke dry extinguishing method using a certain type of inert dregs as well as an apparatus for the same. In this case, in order to maintain a constant flow rate at the cooling gas outlet of the fire extinguishing furnace, a considerable amount of heat from the coke dissipation section stored in the pre-furnace which is in instant contact with the fire extinguishing furnace must be used. The scavenging is carried out with the prefurnace also being scavenged in cocurrent or countercurrent conditions, and then with the flow of inert scum in the extinguishing furnace and prefurnace in the same direction. However, this necessitates the use of a large amount of expensive inert residue.

Recently, it has been proposed to use the high-pressure steam generated in this way to preheat coking coal. Such a process coupling between dry cooling of the coke and its preheating is
This is a valuable use of engineering skills. However, no method or device suitable for this yet exists. According to the prevailing opinion, dry cooling of coke and preheating of coke coal cannot be performed using the same circulating medium, since direct heat exchange between coke coal and coke is to be carried out. Ru. This is because the steam emanating from the preheater causes an aqueous scum reaction during coke cooling, causing coke vaporization losses that exceed permissible values. Therefore, it has been proposed to separate the fuel circulating medium. As mentioned above, inert scum is used for dry coke cooling, and the inert scum is trapped in the heat exchanger f. It has also been proposed to heat the circulating medium containing steam for preheating.

However, all of the above-mentioned methods that have been proposed in the past have problems such as high construction costs and heat requirements.

(1) Separating heat transfer and circulation processes into those using cooling media and those using heating media is costly and reduces the difference in working temperature.

(2) Indirect preheating of coking coal is extremely inefficient due to poor heat transfer between the heating surface and the solid coal. Even if it is operated with a highly humid inert gas heated on the side, it is necessary to accept not only poor thermal conductivity on the coal side but also poor heat transfer on the coal side.

What is needed is German published patent publication No. 24,15758.
No. 1 discloses the countercurrent flow with coke during dry coke cooling. It is also possible to condense and separate the waste from the circulating waste used in the process. However, such a procedure is expensive and requires two stages of condensation.

(The object of the present invention is to be able to directly transfer a considerable amount of heat from the cooling waste to heat-consuming molecules, and to reduce the amount of coke that is cooled during this process, compared to the conventional coke dry cooling method. The object is to provide a method and a device of the type described at the outset, which require significantly less effort in the process. It can be solved in accordance with the features of claim 8f. Other features of the invention are apparent from the dependent claims.

In the method according to the present invention, surprisingly, the water vapor contained in the cooling gas is hardly involved in the coke burnout f.
It appears that there are none.

In this case, the amount of burnout is about 15% for the coke charged, compared to about 15% for dry countercurrent cooling using inert scum.
%. Regarding the type and amount of cooling waste, the temperature f is concerned.
There is no particular restriction as long as harmful residue components similar to water vapor or carbon are contained in the cooling stage which promotes coke burnout.

The two-stage cooling method provides significant coke cooling benefits according to the present invention. Based on the present invention, the amount of heat held by the coke can be used more effectively by countercurrent cooling in the second stage. That is, in the present invention, co-current cooling in the Jth stage f, which reduces the amount of coke burnout, and counter-current cooling, which is more advantageous in terms of thermal technology, in the second stage, are skillfully combined. The cooling scum used in the present invention, particularly the cooling scum produced in the first stage, can also be used for purposes other than preheating coke coal, that is, as an independent source of other industrial waste.

With the structure set forth in claim 41, claim 1, the coke is forcibly cooled or the coke is not significantly burnt out.
Instead of using a large amount of water as in type fire extinguishing, use a small amount of water1]
] Spray on the area and use for 10 times. Claim 45V
The terms [alternating J N r,x] in C have the following meanings. In other words, the amount of water sprayed depends on the pulsation during coke injection, the particle size distribution of coke particles, etc. Table [I]
1 temperature or 80°C (limited to 1°C and FL). This allows the coke particles to be covered on the surface and avoid the vaporization reaction. Since the downward movement during coke injection is relatively small, water jets W; is carried out alternately, that is, with intervals f, E < expediently.

In another embodiment of the two-stage coke dry cooling method, only the second stage cooling waste contains water vapor, while the first stage is operated with, for example, an inert waste, so that no coke burnout occurs. It has further decreased to 0.00% of the normally administered coke. ]%K
fjru. In the end, the cooling in the first stage, which will be described later, was approximately 800
If the coke temperature is below ℃, the co-current quenching will be carried out in the temperature region C, which is particularly sensitive to water gas reactions.
Coke is formed only in the stage, and coke passes through this temperature range extremely quickly. On the other hand, in the second stage, the cooling in the first stage is usually about 7
0°C to 7 (Ma line r, H trap G).

Particularly advantageous is the use of the cooling scum discharged from the cooling tank in direct contact with the coking coal for its thermal pretreatment, i.e. for drying and preheating the coking coal. The most thermally advantageous temperature combination of both methods is achieved.

The steam generated during thermal pretreatment of coke coal contains water vapor and is at a temperature level suitable for dry coke cooling, so it is extremely convenient to use this as a cooling waste. . As a result, there is no need to separately supply cooling waste, and the troublesome problem of removing the residual water vapor can also be avoided.

Ahimi IJI41/l' To carry out such a method, the device proposed by the present invention is used, which makes it possible to realize all the advantages mentioned above. In the example λ, a coke dissipation section is installed in the cooling tank, and cooling gas circulation is performed separately in the case of co-current cooling and in the case of counter-current cooling. In addition, for this purpose, is it necessary to install a cooling waste discharge device above and above the dispersion section, respectively? The coke dissipation section can be realized by providing a bottleneck in the cooling tank or using an upper plate, so that the coke can pass through the dispersion section without much trouble. It is possible to do this without any particular need for movable parts to aid the passage.Also, some mixing in both cooling gas circulations in the region of the dissipation section is also possible. Even if water vapor inadvertently enters the first cooling stage, it can be condensed as necessary before being reused as cooling waste.
Separation is inevitable. Furthermore, if the direction of flow of the cooling gas changes between the first and second cooling stages, J usually results in stagnation of waste, which naturally buffers both circulating media from each other. This is especially the case when the cooling waste discharge devices are sufficiently separated from each other.

Particularly when performing multiple independent cooling cycles using various gases, it is desirable to provide a coke dissipation section as described in claim 1O. It is divided into a soil cooling area and a lower cooling area where coke is cooled by a coke dissipation section.
The region of the coke radiator forms a unique area that acts as a dross recess, and the cooling scum evacuation devices of both cooling stages are arranged at the end of this buffer area. Claim 11 and/or
Alternatively, it can be configured as described in Section 12. This dissipation section is designed so that the coke does not receive excessive mechanical load without the help of a movable member and does not continuously cause clogging (as it passes through a certain opening in the always open shape B). By arranging two types of built-in members with approximately the same shape one on top of the other, a waste buffer space is automatically formed between the two to prevent mixing of the 12 types of cooling waste systems. In this case, it does not matter which of the two built-in members should be placed above or above.

According to the invention, the separation of the cooling waste circulation in the coke dispersion section is achieved by providing each installed component with an inlet opening for the waste removal device.

Therefore, as long as only one of these forms the coke dissipation section, it is desirable to provide separate openings for circulation of the upper cooling gas or T-section cooling gas on the + side and the lower side of each built-in member. These openings, for example λ, can be provided in the form of a sieve on the surface of the built-in part. For upwardly conical built-in members, it is particularly desirable to form an opening at the top of the cone (the cone may be a hollow cone and -C).
. Further, for the downward conical built-in member, it is preferable to provide openings above and below the outer periphery so as to contact the cooling tank, respectively. It may be provided with an annular gas collection conduit (the ten-piece assembly is also formed as a hollow truncated cone).

When the upper and lower built-in members work together to form a one-cox dispersion section, it is preferable that these built-in members have the shape of a hollow cone or a hollow truncated cone. In this case, an opening for circulating the cooling scum at the bottom of the cooling tank is provided, and an opening for circulating the cooling scum at the bottom of the earthenware vessel is provided. The built-in member can have a single-walled or triple-walled structure, and an opening can be provided on its surface so that the debris collected in the internal space of the built-in member 7 can be guided separately from each other.

The damping effect of the coke dissipation section can be improved by the cleaning gas arrangement according to the invention. For this purpose, one or more cleaning scum supply ports or waste ports are provided in the area of the coke dispersion section. This scum can optionally be introduced into the circulation system. The openings mentioned above for the installation are also suitable for this purpose. For example, it is possible to direct the cleaning gas at right angles to the direction of coke inflow to dissipate the coke. It is also possible to pass the coke in the coke inflow direction or vice versa, for example between opposing surfaces of the built-in member.

Other objects, features, effects and application possibilities of the present invention will become apparent from the following description of the embodiments based on the accompanying drawings. , by itself or in any combination, shall not be used to limit the scope of the claims.

In FIG. 1, (1) indicates a cooling tank, and the cooling tank includes an arbitrary coke supply bag N (2) provided on the upper part of the cooling tank.
), an optional coke discharge device (a) provided at the bottom, an upper cooling gas supply device (4), and a lower cooling gas supply device (5).
), and an intermediate cooling gas discharge device (6). (This intermediate cooling gas discharge device N (61it) does not necessarily need to be installed in the vertical center of the cooling tank (1), and in the example λ, the cooling gas supplied from the lower part or the lower part maintains approximately temperature equilibrium. (Any location where it can be obtained is fine.) The cooling waste discharge device (6) can be, for example, an annular pipe that penetrates the side wall of the tank at a plurality of locations.

The cooling tank (1) may have any cross-sectional shape, through which the coke passes. In this case, the upper cooling area is indicated by (]a), the lower cooling area is indicated by (]b), and the action area of the cooling waste discharge device is indicated by (]C). In the second EL diagram,
The coke feeder (2) is constructed as a simple drop pipe. The same applies to the coke discharge device M (aJ and the upper and lower cooling waste supply devices +41 (51). The coke dissipation section (7) has a conical lower built-in member (10) fixed so as to have a gap (8) between it and the inner wall (9) of the cooling tank (1). ) and an upper built-in member (11) in the shape of a downward truncated cone, which has an opening (12) in the center and is attached to the inner wall of the tank.

In FIG. 2a, the opening (6c) is provided in the center of the hollow conical member (10) for upward or downward cooling gas flow in the lower cooling zone (]b). Furthermore, 2nd b
As shown in the figure, for discharging the cooling residue that covers the surface,
Some openings (6c) of the built-in member 00) are bent inwards.
) can also be provided.

The opening (6σ) is located at the outer edge (l) of the built-in member (11j).
la), preferably on the wall of the cooling tank. In this case, the waste removal device is connected to the cooling tank (1) as a ring pipe.
However, from the door, the cooling residue covering the surface is discharged C, and as mentioned above for the lower built-in member [101K], as shown in Fig. 2b, the hollow conical upper built-in member It is also possible to provide (11) with a double-walled or triple-walled structure and pass through it.

There is area 1 of coke dissipation part (7), supply pipe (12a)
The washing scum device (13) with a discharge pipe (2b) and a discharge pipe (2b) can be operated in a cross-flow mode, as shown in FIG. 2a. In addition, it is also possible to supply and discharge the cleaning residue so as to cover the surface of the assembled member. - is the emission y(1
- I will show you how to do it. It goes without saying that such a waste feeding or discharging device can only be provided on the lower side or on the lower side of the assembled member. Follow - (
Fig. 2b is different from that shown in Fig. 1, in that both blood vessels lack one force.

The size, shape, and arrangement of the waste supply and discharge openings, as the case may be, shall be such that coke particles do not enter or block the openings. Of course.

Finally, it is self-evident that the rl or built-in member +10)till is not necessarily constructed in the form of a hollow cone or (1 hollow truncated cone, and the rl edge is illustrated in detail in FIG. 2a). This does not mean that there are not, and the number and arrangement of VC
Change - (by placing it in the cooling tank (1)
Wear. The details of the structure of the device, especially the dimensions, can be determined as appropriate by a person skilled in the art, and the
The same applies to the supply amount P and VC temperature of cleaning scum.

The method according to the invention (for example λ) can be implemented as follows.

The water is pushed from the coke oven into a vertically long cooling tank.
Feed coke into the scale from above.

This coke travels upward in the cooling tank, where it is cooled to the desired temperature by direct contact with the cooling scum supplied from the end of the cooling zone of the cooling tank, and then the coke , and is discharged from the cooling tank. This process can be carried out continuously. The cooling waste can be at the same temperature at each supply point - and the chemical composition can also be the same. The cooling scum can be taken out from an appropriate location in the cooling tank.In this way, the high temperature coke is first cooled down to about 80°C (1°C or less) as rapidly as possible by the cocurrent flow method, and then Preferably, the cooling is carried out in a counter-current manner, and both cooling slags are removed together from the desired temperature zone in the cooling tank (see Figure 1). When fl passes through the high temperature area (soil cooling stage), the second
In the stage, water vapor (e.g. λ is the drying coal
The known advantages of desirable countercurrent cooling, including the steam produced by preheating, can be fully exploited, and there is no need to prepare a separate cooling waste. It is also necessary to perform a suitable transfer.y1 wetness approximately 750℃
Therefore, the cooling waste taken out from both cooling stages can be reused separately. The coke will have a desired final temperature of, for example, 2FlO°C or less.

2nd a using cooling waste that does not contain water vapor in the soil cooling stage
The two-stage operating system with the N system shown in the figure has the effect of significantly reducing coke burnout, and the recommended structure of the coke dissipation section is not particularly expensive both technically and methodically. If such a coke dissipation section is not used, if the cooling wastes of the two stages are different, the cooling wastes of the two stages will be mixed, and therefore considerable costs will be required to ensure unimpeded circulation of the wastes. .

[Brief explanation of the drawing]

The drawings show an embodiment of the apparatus of the present invention, in which Fig. 1 is an explanatory diagram of the principle of the cooling device, Fig. 2a is a vertical sectional view of the J cooling tank shown in Fig. 1, and Fig. 2b is shown in Fig. 2a. FIG. 3 is an enlarged cross-sectional view showing the main parts of a coke dispersion section. (IJ...Cooling tank (]a)...Lower cooling area (stage) (Jb)/Lower cooling area (stage) (10)...
・Intercooled gas discharge device action area (2)...Coke supply device (3) Coke discharge device (4)...
・Upper cooling gas supply device (5)...Lower cooling gas supply device (6)...Intermediate cooling gas discharge device (6a
) (6b)... Conduit (tiC) (6d)... Opening (7)... Coke dissipation section (8)... Gap
(9)...Cooling tank side M1IUi conical lower assembly part (11)...Downward conical lower assembly opening (]2a)...Supply pipe (+2b)...
Discharge pipe (13)...Cleaning sludge device Applicant: Herc Werksverband KM Beher, Patent attorney: Toyoharu Higuchi and two others FIG, 2G Continued from page 1 @ Inventor: Horst Schumacher - Germany Federal Republic of 4300 Etsen Heisingen Stemmerling 50

Claims (1)

[Claims] (1) Dry coke using cooling gas, characterized in that coke and cooling scum containing some water vapor are brought into direct contact and passed through a cooling tank in a cocurrent underground state. Cooling method. (2) The method according to claim 1, wherein the cooling is performed in two stages. (13) Cooling residue into coke in the second stage (4) Cooling in the first stage with a small amount of water, preferably 5 Kq 11 to 12 K of water per ton of coke. The method according to claim 2 or 3, characterized in that the method is forcibly carried out by alternately spraying. (5) A method according to claim 2 or 3, characterized in that the cooling gas of the second stage contains only water vapor. (6) The method according to any one of claims 2 to 5, characterized in that the cooling in the first stage V is performed on coke at a temperature of about 800°C or higher. (7 ) The method according to any one of claims 1 to 6, characterized in that the cooling scum discharged from the cooling tank is brought into direct contact with coke raw coal and used for preheating treatment. ) The method according to any one of claims 1 to 7, characterized in that steam generated incidentally during preheating treatment of coke raw coal is used as the steam-containing cooling gas. ( 9) Coke feeder (2) in the upper part, one coke discharger (3) in the lower part, one each in the upper and lower parts of the cooling sludge supply equipment t41 and t5), and the cooling sludge discharger in the center. Device for carrying out the method according to claim 1, characterized in that it has at least one cooling tank (1). (10) In the action area (]c) of the cooling waste discharge device (6a, 6b) formed between the upper cooling area (]a) and the 1st part cooling area (1b) of the cooling tank (1). The apparatus according to claim 9f, characterized in that a coke dissipating section (7) is provided. (11) The coke dissipating section (7) is connected to the inside of the cooling tank (1) @ (9) for a short period of time (at least partially for 1 w (8
11. The device according to claim 10, characterized in that it is constituted by a conically shaped built-in member (10) arranged in the tank at a distance of 7). (12) The attached coke dissipation section (7), or at least its part, is attached to the inner wall of the cooling tank (1) + 9) K. ) The device according to claim 0 or 1J. (13) The opening (6C) of the waste discharge device (6) is
Claims υ)
[G] The device according to item 1 f. (]41 Refuse discharge 1" opening (1-i) of device (6)
d) is the outer edge of the built-in member (11) (]] a) W
11. The device according to claim 12, wherein at least one device is provided. (15) The apparatus according to any one of claims 10 to 14, further comprising a washing scum device (]2a, ]2b) for the coke dispersion section (7). (Margin below)