DE2624886A1 - SEALANT FOR COOK OVEN DOORS OR THE LIKE - Google Patents

Description

PATENT ADVERTISER BODE POSTBOX 6140. D-4030 RATINGEN 6 - HÖSEL TELEF (

H 5 - 51

Coal Industry (Patents) Limited Hobart House, Grosvenor Place, London, SWlX 7AE, England

Sealants for coke oven doors or the like

The invention is concerned with the sealing of coke oven doors and relates to a sealant for coke oven doors or the like based on a material with a clay-like consistency.

In coke ovens with doors that are not self-sealing, attempts are made to reduce gas and dust emissions by using sealants or to prevent putty as a seal. Such a sealant must be inexpensive and will be in place mixed with slate and / or coke and a portion of clay so that it has sufficient flexibility and the gap between the door and the frame can be made with a trowel. Typically the sealant will ground and mixed in batches of 2oo kg in a pan, with 4o parts of slate from a pit and 7 parts contains fresh local clay and the parts are also often added shovel by shovel. The finished sealant also contains sufficient water, which is added in an amount of approximately 25% by weight. Two men then apply the sealant to the coke oven door using trowels. A door with the dimensions of

609883/078?

PATENTANWALT BODE POST BOX 6140 D-4030 RATINGEN 6 - HÖSEL TELEPHONE C

8 feet: 2 feet requires approximately 17 kg Sealant that is applied in 2.5 to 3 minutes. The temperature of the sealant rises within 12 minutes to around 25o C at a maximum temperature of about 400 ° C. As the sealant dries, it shrinks linearly up to about 4 percent and therefore separates from the sides of the door and / or the frame and also longitudinal and transverse cracks occur. Around to prevent the entry of air into the coke oven, which would cause considerable damage, is the Coke oven maintained at a pressure slightly above atmospheric pressure, for example at overpressure up to 6 or 7 mm, usually with 1-4 mm water column in the manifold. This allows the gases from Inside the furnace through the cracks in the sealant leak and unwanted and dangerous emissions form or ignite and deform the door. The problems of emission always win g; "ßere Significance with increasing attention to environmental protection and the protection of workers.

Many attempts have been made to solve this problem, but the only way that actually continued was careful maintenance and cleaning of the coke oven doors and frames. Such maintenance and cleaning is often very difficult, especially when coke ovens work continuously with fixed operating instructions and in addition, they are decades old. The object of the invention is to eliminate these disadvantages and a Specify sealant with which coke oven doors can be reliably sealed.

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609883/0762

PATENTANWALT BODE POST BOX 6140 D-4030 RATINGEN 6 - HÖSEL TELEPHONE 02102-60001 TELEX 8585166

This object is achieved with a sealant which contains a blowing agent which is at least in the temperature range forms gases from 16o - 29o ° C. Preferably, the blowing agent in the temperature range of 14o - 24o C gases form. The proportion of the blowing agent can be 0.5 to 5 percent by weight, preferably about 1 percent by weight, The water content of the sealant should in particular be 23-27 percent by weight.

The blowing agent can be a mixture of one or more blowing agents. A suitable blowing agent is a mixture of "Genitron" OB, which is in the temperature range of 14o - 16o ° C swells, with "Genitron" AC2, which swells in the temperature range of 19o - 22o ° C. These blowing agents are mixed in a weight ratio of 3: 1 to 1: 3. Appropriate becomes a Mixture used in a ratio of 1: 1 ·. "Genitron" bulking agents are available from Fisons Industrial Chemicals, Cambridge expelled.

The water content of the sealant is generally 20-3o percent by weight and in particular 23-27 percent by weight .

The pH of the sealant can be set at 8, for example because alkaline sealants adhere better to iron doors and frames of coke ovens.

In addition to the clay normally used as the base for the sealant, others can Substances with a clay-like consistency such as pressed mountains from hard coal production are used, that is the solid filter cake from the foam flotation for

609883/0762

PATENTANWALT BODE POST BOX 6140 D-4030 RATINGEN 6 - HÖSEL TELEPHONE 02102-60001 TELEX 8585166

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Purification of coal.

It is of course desirable that the blowing agent be uniform is distributed in the mixture and that the sealant sdr is finely ground. It turned out that a pan mill is sufficient, but other mixers and mills, such as ball mills, can be used as an alternative or in addition be used. Because the sealant is normally recycled, coke oven reclaimed sealant contains, which can contain solid parts such as nuts or bolts, it is advantageous if the sealant after grinding and mixing is passed through a sieve, e.g. a sieve with a mesh size of 6.35 mm (1/4 ").

Unexpectedly, a large portion of the sealant remains moist while it is heated until the sealant is reached the temperature reaches around 25o - 29o C. Surprisingly, it is possible that the blowing agent foams the sealant and thereby counteracts natural shrinkage and improves the seal through slight expansion.

When the foamable sealant is applied in the conventional manner with trowels, already visual results Observations that the emission is reduced by 50%. Preferably, therefore, the foamable sealant should can be applied with a special spray gun, which reduces emissions by approximately 7 5%.

609883/0762

PATENTANWALT BODE POST BOX 6140 D-4030 RATINGEN 6 - HÖSEL TELEPHONE 02102-60001 TELEX 8585166

If there are major leaks or emissions after foaming the sealant, then through Using additional putty will further improve the seal. An offset PVA putty is preferred, e.g. 50 parts by weight of a mixture of PVA latex and water mixed in a ratio of 7: 3, as well as Contains Ho parts by weight of talc and Io parts by weight of asbestos fibers.

The invention is explained below using an example.

Example:

To produce a sealant, 40 parts by weight of a recovered sealant, 7 parts by weight of clay and 1 part by weight of blowing agent (all parts by weight based on the total amount (together with water, the total amount of which in the finished sealant is 2 5%, Ground and mix in a pan mill for about 20 - 40 minutes. The blowing agent consisted of a 1: 1 mixture from "Genitron'OB and" Genitron "AC2.

This sealant was then placed in a gap between a coke oven door and its frame, where it was foamed during the heating and thus gave a much better seal than a non-foaming one Sealant and significantly reduced emissions.

- patent claims -

609883/0762

Claims (5)

PATENTANWALT BODE POST BOX 6140 D-4030 RATINGEN 6 - HÖSEL TELEPHONE 02102-60001 TELEX 8585166 N 5-51 Patent claims: 1". Sealants for coke oven doors or the like on the basis of a substance with a clay-like consistency, characterized by a blowing agent which is at least in the. Temperature range forms gases from 16o - 29o ° C. 2. Sealing means according to claim 1, characterized in that the blowing agent Forms gas in the temperature range of 14o - 24o C. 3. Sealing means according to claim 1 or 2, characterized in that the proportion of the Blowing agent is 0.5 - 5 percent by weight. M-. Sealing means according to claim 3, characterized that de? Proportion of the blowing agent, is approximately 1 percent by weight. 5. Sealant according to one of claims 1-4, characterized by a water content from 23-27 percent by weight. VII / sch 609883/07