DE3120400A1 - Horizontal chamber furnace for producing gas and coke - Google Patents

Abstract

In a horizontal chamber furnace for producing gas and coke, which comprises runner walls bordering the flues and the coke chambers and separating them from one another, header columns arranged in the flues, a furnace cover covering the flues and the coke chambers, and the furnace floor, the runner walls consist of steel sheets (1) which are suspended from the upper end of the header columns in the form of supports and end in the region of the furnace floor without a firm connection to the adjacent masonry, the lower end sections of the steel sheets in the region of the furnace floor preferably projecting into slots sealed with mineral fibre sheets. The metallic runner walls (1) may consist of sheets of austenitic or ferritic-austenitic steels, preferably chromium nickel steels containing at least 18% of chromium and at least 4% of nickel, optionally with the addition of cobalt, tungsten, niobium, titanium and aluminium. <IMAGE>

Description

312C400

The invention relates to a horizontal chamber furnace for the production of gas and coke, which consists of the heating flues and the Coke chambers delimiting and separating rotor walls, binder stone columns arranged in the heating flues, as well as a furnace roof covering the heating flues and the coking chambers and the furnace sole.

Usually the rotor walls are made of horizontal chamber furnaces made of refractory bricks with a wall thickness between 80 and 120 mm. Through the runner walls the heat released in the heating flues is transferred to the bulk coal in the coking chamber. During operation, the temperature of the runner wall on the side of the heating cables is around 1300 to 1400 ° C, while the wall temperature on the coke side is a few 100 ° C lower and around 1000 ° C towards the end of cooking lies. This results in considerable temperature gradients within the rotor wall. The ones for maintaining of the heat flow from the heating flue side to the coke side required high temperature in the heating flues is relative high combustion temperatures of the combustion media in the heating flues precede, which inevitably leads to an undesirable lead to high NO production.

The state of the art includes vertical chamber smoldering furnaces with U- or I-shaped metallic inserts, for example in DE-PS 670 916, 669 440, 692 692, 697 4-70 and 698 909 are described. With this type of furnace the brick wall was retained; the inserts made of metallic materials were used for the Divide the furnace chamber into individual vertical sections.

A vertical chamber smoldering furnace is also known which is used in the essentially consists of a steel structure. In this type of furnace, the heating elements or heart chambers consist of Sheet metal and are rotatably mounted on the top of the furnace.

312U4Ü0

The filling, which is swell between the heating chambers in the relatively narrow furnace chambers, is moved by a pendulum movement of the heating chambers pulled down in free fall.

Vertical chamber smoldering furnaces of the type mentioned above are used in exceptional cases at temperatures around 550 to 600 ° C operated up to 700 ° C. Metallurgical coke can be used in vertical chamber smoldering furnaces not generate. It is usually produced in a horizontal chamber furnace.

The invention is based on the object of the temperature gradient inside the rotor walls of horizontal chamber furnaces with the aim of reducing the combustion temperatures the media in the heating flues and thus the NO -Pro-

reduce production.

Based on a horizontal chamber furnace of the type described at the beginning The invention is that the rotor walls are made of steel sheets at the upper end the binder stone columns designed as supports are suspended and in the area of the furnace base without a fixed one End connection with the neighboring masonry.

Further features of the invention emerge from the subclaims .

The use of metallic rotor walls results in the thermal conductivity being approximately one order of magnitude higher and the small thickness of the metal sheets compared to the wall thickness of masonry runner walls considerable advantages »The heat flow through the steel wall takes place with temperature gradients of a few degrees, at most 10 to 20 ° C, so that the heating draft temperature at the mentioned coke end temperature of 1000 C only can be marginally higher. At the same time, this significantly reduces the NO production. Because of the overall

together with lower temperature levels in the heating flues The total heat radiation above the ceiling and on the front of the coke oven battery is also significantly lower lie.

The use of metallic rotor walls also leads to a considerable shortening of the furnace pitch or the total length of a battery, which can be around 10 to 20% , as well as a reduction in the construction weight.

The hanging arrangement of the runner walls provided according to the invention makes it possible for the wall to move when it is heated can stretch freely and without compression to around 1000 ° C in the vertical direction. You can do this in the in the field the slits provided in the oven sole. The hanging arrangement is also advantageous because the metallic material is in a state of creep at operating temperature, so that internal stresses as a result of non-uniform temperature distribution leading to deformations could lead to be balanced by the dead weight of the metallic walls. This effect can be reinforced by weights that are attached to the lower end of the runner walls and the formation of bumps impede.

During normal operation, the metallic rotor wall on the heating cable side is subject to oxidative attack from the excess air exposed to the resulting abdominal gases, which lead to rapid scaling in unalloyed materials. It is well known that steels with at least 13% chromium are in the temperature range of about 1000 C in question sufficiently stable. Since, however, on the facing side of the rotor wall, it is essentially carburizing or alternating carburizing and oxidizing gases occur and for manufacturing reasons, according to the invention,

312Ü400

Preferably austenitic or ferritic-austenitic chromium-nickel steels with at least 18% chromium and 4% nickel, optionally with additions of cobalt, tungsten, niobium, titanium and aluminum, are used. For example, the rotor walls can consist of sheets of chromium-nickel steel with 25 % chromium and 20% nickel or 21% chromium, 25 % nickel and additions of titanium and aluminum.

It is also possible to use sheets that are coated with alloys on one or both sides are resistant to high temperature corrosion are. The coatings can be made in a manner known per se by plating, powder spraying or the like be applied.

In the drawing is an embodiment of the invention shown. Show it:

Figure 1 is a vertical section through the upper portion of a binder stone column in the area of Oven ceiling in schematic representation and

FIG. 2 shows a corresponding section through the lower section of the binder stone column in the area of FIG

Regenerator cover and the furnace sole.

The upper stone layer 4 consists of individual stone layers 5 Binder stone column protrudes into a recess 5 of the Oven roof 9 into it. The upper edges of the steel sheets 1 forming the rotor walls are bent at right angles and lie with the bevels 2 on the topmost stone layer 4 of the binder stone column. You can go through the one space in between forming recesses 5 in the furnace roof of the side across the entire width of the coke oven. This takes place after the completion of the entire masonry. Also changing the runner walls

- 8 1 is possible in this way.

In the area of the furnace sole shown in Figure 2, the consists of stone layers 6, which are bricked up on the regenerator cover 11, are the lower sections the runner walls 1 guided through a slot 7 on both sides between the lowermost layer of the binder stone column 3 and the oven sole is left free. Below the slots 7 are cavities 10 for receiving weights 8 are provided, which are fastened in the vicinity of the lower edge of the walls 1 at certain intervals. The lowest The position of the binder stone column rests on stone layers 12, which are also bricked up on the air generator cover are.

Normally, the metallic runner wall is due to the slightly higher temperature on the heating cable side and the associated change in length is printed against the end faces of the binder stone columns and thus causes the required sealing between the individual heating flues. This contact pressure can be increased by that the gas pressure in the coke chamber during the cooking process is kept slightly higher than the gas pressure in the heating flues. During and after the filling process there is sufficient contact pressure anyway due to the loose bulk of the coal. The sealing effect can also be improved by coating the end faces of the binder stone columns with mineral fiber fabric will.

Claims (1)

31204ii Radt, Finkener, Emesti Patent attorneys Heinrich-König-StraßcaJC 119
Bochum Telephony IPSM) 47? Vi SH Telegram address Radlpatenl Bochum 9/81 EEF / US Horizontal chamber furnace for the production of gas and coke Claims 1. Horizontal chamber furnace for the production of. Gas and coke, the rotor walls delimiting and separating the heating flues and the coking chambers, arranged in the heating flues Binder stone pillars, as well as a furnace roof covering the heating flues and the coking chambers and the furnace base "consists, characterized by that the rotor walls consist of steel sheets (1), which are designed as supports at the upper end of the Binder pillars are suspended and in the area of the furnace sole without a fixed connection with the neighboring one Brickwork ends. 2. Horizontal chamber furnace according to claim 1, characterized in that the steel sheets forming the rotor walls (1) at their upper horizontally extending edges in the area of the upper end of the binder stone columns with a right-angled fold, whereby they are provided with the fold (2) on the upper surface of the binder stone columns and are therefore suspended from them. 3. Horizontal chamber furnace according to claims 1 and 2, characterized in that the fold (2) extends over the entire length of the steel sheet forming a rotor wall extends. 4-. Horizontal chamber furnace according to Claims 1 and 2, characterized in that the walls forming the rotor Steel sheets only in the area of the tie pillars with a - 2 edges (2) are provided. 5 · Horizontal chamber furnace according to claims 1 to 4, thereby characterized in that the fold is formed by deforming, in particular by bending over a corresponding section is formed in the area of the upper edge of the steel sheets. 6. Horizontal chamber furnace according to claims 1 and 2, characterized in that the fold is welded on is formed by angle profiles. 7 · Horizontal chamber furnace according to claims 1 to 6, characterized characterized in that the lower end sections of the steel sheets (1) in the area of the furnace base (6) are sealed Slits protrude. 8. Horizontal chamber furnace according to claim 7> characterized in that that the slots are sealed with Hineral fiber foils. 9. Horizontal chamber furnace according to claims 1 to 8, characterized characterized in that weights are attached in the area of the lower edge of the runner walls. 10. Horizontal chamber furnace according to claims 1 to 9, characterized characterized in that the end faces of the binder stone columns (3) facing the runner walls are covered with mineral fiber fabric are provided. 11. Horizontal chamber furnace according to claims 1 to 10, characterized in that the metallic rotor walls (1) on the machine-side steel structure of the furnace secured against displacement in the horizontal direction are. 12. Horizontal chamber furnace according to claims 1 "to 11, characterized in that the metallic rotor walls (1) made of sheets of austenitic or ferritic-austenitic steels, preferably chromium-nickel steels with at least 18 % chromium and at least 4% nickel, optionally with Additions of cobalt, tungsten, niobium, titanium and aluminum exist. 15. Horizontal chamber furnace according to claims 1 to 12, characterized in that the rotor walls consist of metal sheets, which on one or both sides with a counter High temperature corrosion resistant alloy are coated.