JPS5993789A - Coke oven battery - Google Patents

Abstract

A coke oven battery (1) has horizontal coking chambers (2) and a roof (3). Vertical conduits (6,7,8) extend through the roof (3). In order to prevent leakage of gas through the roof (3) a gas tight screen (15) of metal sheet is provided in the roof (3). The screen (15) consists of substantially horizontal sections (17) extending between the vertical conduits (6,7,8) and substantially vertical sections (18) adjacent the vertical conduits (6,7,8). The vertical sections (18) have a gas-tight seal to moulded bricks (14) at the top of the vertical conduits (6,7,8) by casting in concrete a stepped portion of those sections (18) and the moulded bricks.

Description

[Detailed description of the invention] The present invention relates to coke oven batteries.

BACKGROUND OF THE INVENTION Coke ovens are known that have a plurality of coking chambers containing approximately water and a roof portion of the oven body. The roof of the furnace body carries a number of vertical conduits, for example for inspection, removal of coke oven gas, and battery charging operations. Most of the roof of the furnace body is made of masonry, and cracks occur at the joints between the masonry when the coke oven battery is ignited and during operation of the battery. For this reason, coke oven scum generated during operation of the battery leaks from the coking chamber in the pantry to the outside of the battery, or to the combustion device of the battery via the open jφ root joint and drowning 1]1.

Gas leakage is caused by coke oven scum that is formed during the -L stage of coking and leaks into the oven roof. (i) a coking chamber; (11) an omission in the furnace roof for the removal of coke oven scum (commonly referred to as an "E-directed vent pipe"); and/or (iii) a furnace roof +1J. This is the charging pipe in the section.

The convection of the coke oven scum increases the temperature of the oven roof and the combustion of gases in the roof (such combustion is known as "inner fire") can damage the brickwork. . Tie rods attached to the roof heat up excessively and the tension created by these rods decreases, reducing their effectiveness.

J, the root -L section usually contains porous insulation bricks.

Hydrocarbons in the coke oven gas aggregate within these bricks, reducing their insulating effectiveness. The coke oven gases also pass through the roof to the burner in the burner, causing incomplete combustion and producing chimney smoke. Coke oven scum escaping into the atmosphere causes environmental pollution.

There is also a possibility that the combustion gases will leak from the combustion chamber, in particular from the inspection lines extending in the molar direction, through the furnace roof, into the furnace roof itself, and from there into the atmosphere.

Leakage of coke oven gases and combustion gases results in reduced efficiency and therefore low F economical performance and also makes operation of the stove more difficult. Leakage problems result in deterioration of (parts of) the furnace roof, requiring repair. As previously mentioned, tie rods are sometimes sunk into the roof, which applies compressive forces to the lateral edges of the roof. Although this reduces the amount of gas leakage, this effect is very limited and is not useful for preventing local leakage.

For example, according to Oranta patent application No. 8,101,080, it is known to cover the outside of the lateral edges of a coke oven battery with a metal foil material. Such external coatings are impractical for use on furnace roofs because they can be damaged very easily. Also, this coating does not prevent gas from leaking from one battery to the other.

The present invention seeks to eliminate or at least reduce the problem of gas leakage in the furnace roof.

The invention accomplishes this by providing a gas-tight screen in the roof. This screen has a substantially horizontal portion extending between the vertical pipes in the roof portion, and a substantially vertical portion adjacent to the vertical pipes. This generally horizontal portion limits the diffusion of gas from the coking chamber, and the generally vertical portion limits diffusion from the coking chamber. The generally vertical portion also assists in reducing the leakage of scum into the combustion system.

Preferably, the screen is made from a plurality of metal plates.

The generally vertical portion of the screen should preferably be configured to extend to a point at or adjacent to the top of the furnace roof. To prevent leakage from the top of the screen near openings in the conduit, the tops of the generally vertical sections are fitted with molded bricks that form gas-tight seals that limit the conduit. It is desirable that the system be configured to do so. This can be achieved by casting in concrete the steps of the vertical section to the shaped bricks.

If there are multiple conduits that are closely spaced,
A simple screen structure can be obtained by combining the vertical sections near these conduits to form a common eastward oriented screen section.

In order to improve the gas-tight sealing of the screen, it is preferred that the section approximately in the direction F is comprised of two separate horizontal layers separated in the stacking direction.

If the furnace roof consists of multiple layers of silica and/or chamont bricks from bottom to top, and also of several layers of refractory insulating bricks, at least approximately It is desirable that the force 1i++ 7i11 min is installed in the X6 min (including insulating bricks with porous fire resistance).

The tie openings are preferably provided in the roof so that the screen is between the tie rods and the coking chamber. This prevents leakage of gas into the tie rod and reduces the risk of loss of tensile strength of the tie lot due to overheating.

Next, one embodiment of the present invention will be described by way of example with reference to the accompanying drawings.

In Figures 1, 2 and 3, the coke oven/
The furnace has a horizontal coking chamber 2 and a furnace roof 3. The temperature of the coke mixture in the coke chamber 2 during operation of the battery is about 800°C. The furnace roof portion 3 is often constructed as a brick structure, and has a wall thickness of approximately 1 m.

The combustion chamber wall surface 4 is provided between the adjacent coke chambers 2,
Each wall 4 includes a multi-shell combustion chamber 5. During operation, the temperature in the combustion chamber 5 is approximately 1350°C. A number of eastward-oriented inspection lines 6 are provided in the furnace roof 3 and open into the combustion chamber 5 . at least 1 for coke oven gas
Two -L-directed ridges 7 are provided on the furnace roof 3 for each coking chamber. In most coke oven batteries, several, for example four, charging pipes 8 are also provided in the oven roof for coking the coal. The test line 6 and the charging line 8 are sealed off during operation by means of a power supply.

During operation, the coke oven gas flows through the joints and crevices opening in the arch 9 of the oven roof 3 (see No. 214).
It passes through the direction line 7 and the charging line 8 in the direction indicated by the arrow 10. The combustion gases seek an exit into the atmosphere through the roof of the furnace body in the direction of arrow 11, or under certain conditions, as shown by arrow 12, take the entire route to the combustion device via inspection line 6. put out. Under other conditions, the gases also pass through the furnace roof in the test line 6 in the direction of the arrow 27, and at the same time the combustion gases also exit into the atmosphere in the direction of the arrow 1'l. Find out.

4 and 5, the present invention has a general furnace roof structure, that is, an inspection pipe 6 with a vertical roof and a charging pipe 8 formed of molded bricks 14 inside. It is shown as consisting of a brickwork structure 13 provided. Many variations of the embodiments of the invention according to the examples will occur to those skilled in the art, all of which are within the scope of the invention.

A scum-tight screen 15 is installed between the vertical lines 6.7 and 8 (on the roof of the furnace body). The screen 15 consists of generally horizontal and vertical portions 17 and 18, respectively, formed from a metal plate 16, with the generally horizontal portion 17 extending between the conduits and the generally vertical portion 18 extending between the conduits. Adjacent to lines 6.7 and 8.

The metal plate 16 is attached to the joint of the brickwork 13. For example, a good structure has a metal plate thickness of 0°05~0.
．． It is made of an oxidation-resistant alloy steel foil having the following composition: 15-30% chromium, 5-25% nickel, and 0-10% molybdenum. The screen portion 17.1 consists of a plate or coil of fixed dimensions, for example +11 is 60 or 90 cm.
Used for the production of 8. These plates are attached in a superimposed manner.

The plate material can be installed not only when constructing a new coke oven battery, but also can be used after partially demolishing the existing furnace roof.

A generally vertical section 18 extends from near the top of the furnace roof. A substantially vertical section 18 of the screen 15 prevents debris from passing through the screen section 18 in a vertical direction in the direction of the arrow lo in the vertical line 6.7.8 via the brickwork. The substantially horizontal portion 17 of the screen 15 prevents the gas that has passed through the furnace roof 3 from the arch 9 of the coking chamber 2 from propagating into the atmosphere. The generally horizontal portions 17 may also be forced into the brickwork through these portions along the bottom of the generally vertical portions 18 of the screen 15, for example if these portions are subject to high temperatures. This prevents the gas being sent from leaking into the atmosphere.

The approximately vertical portion near the inspection pipe 6 is also inspected? i
This prevents the discharge of gases from passing through the brickwork below the generally horizontal portion 17 of the screen 15 into the combustion device via the ducts! d.

substantially vertical portion 18 of molded brick 14 and screen 15;
In order to prevent leakage into the atmosphere at the top of roads 6.7 and 8 through the brickwork in between, approximately vertical sections of the screen were placed in contact with the molded bricks at point 19. By doing so, and preferably by shaping the structure made of refractory concrete in this way, it is arranged to form a gas-tight joint with the molded bricks 14. The shaped bricks at the top of the vertical conduits are most often slightly recessed relative to the shaped bricks below these conduits. Thus, a stepped top 20 of the vertical section 18 is desirable to provide a leak-tight connection between the molded bricks of the top and the scum. Since the top portion 20 provided with such a stepped portion is considered to form the vertical portion 18 of the screen 5, these portions 18 are not vertical over their entire length, but are generally called the part of

The combustion chamber wall inspection lines 6 are mounted in rows and placed close to each other in the conventional coke oven construction, as shown in the first IN. A substantially vertical portion can be attached to the roof of the furnace body around each test pipe 6, and this substantially vertical portion can be attached to the row of test pipes so that This results in a simple construction in which two substantially vertical sections 21 are formed on each side of and in the vicinity of the row of test conduits 6.

In the construction according to the invention, the gas that has permeated the brickwork accumulates in the lower part of the substantially horizontal section 17. Defects in the generally vertical portions result in a significant amount of leakage again due to the permeation of this gas through one or more generally horizontal portions. Therefore, the screen part of water 11 direction is
It should preferably be constructed of two separate horizontal layers 28 of vertically spaced metal plates.

In the construction known in the art, the furnace roof comprises, from bottom to top, firstly a plurality of layers of silica bricks 22 adjacent to the coking chamber 2 and the combustion chamber 5, and possibly a plurality of layers of chamotte bricks and a porous It consists of several layers of insulating bricks 24 with a fire resistance of . As shown in FIGS. 4 and 5, at least the horizontal portion 17 of the screen 15 must be attached to a portion of the roof that preferably comprises porous refractory insulation bricks.

The screen 15 that does not leak debris shown in FIG.
This screen is basically the same as that shown in FIGS. Therefore, the structure is much simpler, and therefore, the space required for the screen to be cut into the roof part 3 is much less than 9F. As in the example of ij et al., the screen 15 has a substantially water direction portion 17 formed from a metal plate and a substantially vertical direction portion 8.
It has 8 minutes and 18 minutes. The screen 15 is arranged to form a leak-tight joint of the molded bricks and scum at the top of the conduits 6 and 8. Additionally, the generally vertical portions 18 of the screen 15 bordering the rows of test W paths are combined to form vertical portions 21 on and near each side of the test conduit.

The generally vertical portion 21 shown in FIG. 6 is disposed approximately in line with the vertical portion of the stepped top 20 shown in FIG. Similarly, the approximately horizontal portion 1'/ of the screen shown in FIG. 6 is approximately linear with the water 1L portion of the stepped top 20 shown in FIG. It is located. In this preferred embodiment of the screen, tie rods are attached to portions of the furnace roof on opposite sides of the screen 15 from the coking chamber, so that the tie rods 25 are protected from temperature increases due to gas leakage. . The tie rod is
Further protection from temperature rises is provided by an insulating panel 26 left in the screened portion of the furnace roof.

Furthermore, the stepped portion 20 of the generally vertical portion 18 shown in FIG. 5 is provided with another vertical portion 29 forming a channel 30 (see FIG. 1) for the tie rod 25. 5, and this channel extends substantially the entire length of the tie lot in the roof section, and this channel is shown in stepped top 20 and separate section 29 in FIG. 5 and 6 iM, respectively. Part 17.18.2
1 to 6. Said another vertical section 29 has a heat insulating material 26
is provided, so that the tie rod is completely sealed 11-
The furnace body is insulated from the roof.

[Brief explanation of drawings]

Figure 1 is an elevational view showing the coke oven transition at the roof of the furnace body, Figure 2 is a cross-sectional view of the roof of the furnace body taken along the arrow II-II in Figure 1, and Figure 3 is a line taken along the line in Figure 1. lll-
FIG. 4 is a cross-sectional view on an enlarged scale of the portion indicated by arrow IV in FIG. 2, and FIG. 5 is a longitudinal cross-sectional view of the portion indicated by arrow V in FIG. 3. , and FIG. 6 are longitudinal sectional views taken along line VI-Vl in FIG. 2...Coke Kitamoto, 3...Furnace roof, 4...
Combustion chamber wall surface, 5... Coking chamber, 6... Inspection pipe, 7... Upward pipe, 8... Charging pipe, 9... Arch, 13... Ridge tile assembly structure , 14... Molded brick,
15...Screen, 16...Metal plate, 17...
a substantially horizontal portion, 18...a substantially vertical portion;
20...Top portion provided with a stepped portion, 21...Part approximately in the direction of the middle surface, 22...Silicite brick, 25...Tie φ lot, 2G...1tIi thermal material, 28... - Layer in the water direction, 29...S [Surface part, 30... Channel.

Claims (1)

[Claims] 1. A furnace roof part (3) that accommodates a plurality of horizontal coking chambers (2) and a plurality of substantially vertical pipes (6, 7, 8); a coke oven battery comprising: said roof section covering a gas-tight screen (15), said screen extending between said conduits (6, 7, 8) and a generally horizontal portion (17); A coke oven battery, characterized in that it has a substantially vertical section (18) adjacent to the p-way (6, 7, 8). 2. The coke oven eight-story coke oven according to claim 1, wherein the screen (15) is formed of a plurality of metal plates (18). 3. The substantially vertical portion (18) of the screen (15)
) extends at or adjacent to the top of the oven body roof (3). 4. Approximately Tti perpendicular portion of the screen (15) (
Claim 18) wherein the tops of at least some of the pairs of six orthogonal conduits (6, 7, 8) have a gas-tight seal against the molded bricks surrounding the two orthogonal conduits (6, 7, 8). The coke oven/manufacturer according to any one of items 1-3. 5. Said sludge-tight seal is achieved by casting in concrete the stepped portion of the substantially vertical portion (18) of said screen and the shaped bricks of the corresponding pipes (6, 7, 8). A coke oven according to claim 4, which is formed by a coke oven. 6.813 At least some of the vertical conduits (6) are closely adjacent, and at least one of the screens (15) is common to the closely adjacent vertical conduits (6). Coke oven/hetzer according to any one of claims 1 to 5, wherein each vertical section (18) is present. 7. A substantially horizontal portion (17) of the screen (15)
Coke oven 7 housing according to any one of claims 1 to 6, wherein the coke oven (7) comprises at least two vertically spaced layers. 8. The furnace body roof part (3) is made of a plurality of layers of silica stone and/or chamotte bricks (22, 23), and ``1'' of the silica stone and/or chamotte brick layers (22, 23).
at least a substantially horizontal portion (17) of the screen (15) is made of porous refractory insulating bricks (24', +
Claims i-7J are arranged between the layers of
Coke oven battery according to any one of paragraphs 1-4. 9. A plurality of tie rods (25) are connected to the furnace roof (3).
), and the screen (15) is located between the tie rod (25) and the coking chamber (2).
1&, coke oven battery. 10, said screen is arranged to form a channel (30) for said tie rod (25), said channel (30) forming a tie rod in said furnace roof (3);
Coke oven pantry according to claim 9, which extends over substantially the entire length of the rod (25). 11. A coke oven 7 unit according to claim 9 or 10, wherein a heat insulating material (26) is installed between the screen (, 15) and the tie rod (25).