Metal working – Method of mechanical manufacture – Repairing
Patent
1995-08-31
1998-05-05
Bryant, David P.
Metal working
Method of mechanical manufacture
Repairing
2940705, 264 30, B23P 600
Patent
active
057459690
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method and an apparatus for repairing a damaged area of an oven wall which partitions a coke oven chamber (namely, a carbonization chamber) and a combustion chamber in a coke oven of a chamber oven type.
BACKGROUND ART
A coke oven of a chamber oven type comprises regenerator chambers located at a lower portion of a furnace body. On the regenerator chambers, coke oven chambers and combustion chambers are alternately arranged. Fuel gas and air are preheated (in case of rich gas, air alone is preheated) in the regenerator chambers, burnt, then subjected to heat recovery in the adjacent regenerator chambers, and discharged through flue ducts. Coal charge in each coke oven chamber is indirectly heated through oven walls from the combustion chambers located at both sides thereof and is thereby subjected to dry distillation to be transformed into coke. The coke oven of a chamber oven type is constructed mainly by silica bricks and clay bricks and partly by heat insulating bricks and common bricks.
When the coke oven of a chamber oven type is used for a long period of time, damages are inevitably caused to occur on oven walls due to various factors such as external mechanical force, thermal stress, and moisture in coal charge. In particular, the oven walls in the coke oven chambers are readily subjected to damages such as crack of joint, crevasse, flaking of bricks because those actions based on the above-mentioned various factors are concentrated thereto. In presence of such damages, resultant gas produced in the coke oven chamber may flow into the combustion chambers. This results in environmental pollution by black smoke produced in incomplete combustion and in deterioration of productivity due to local decrease in temperature of the combustion chambers. In view of the above, it has been a practice to spray mortar onto a damaged area as a repairing material. In case of a serious damage, the bricks must be exchanged at a high repairing cost.
It has been said that the coke oven of a chamber oven type has a lifetime between 20 and 25 years. Recently, an extended lifetime between 30 and 35 years is expected by an adaptive repair work enabled by an improved accuracy in diagnosing the damaged area of the oven wall and an improved repairing method.
On the other hand, replacement of the coke oven requires a large investment of at least several tens of billions for each coke oven battery. This imposes a heavy pressure upon a financial environment of a company. It is assumed that the existing coke ovens in this country have a lifetime of 35 years. In this event, most of those ovens must be replaced around 2000 A.D. This implies a problem of shortage of silica bricks and oven constructors.
Taking the above into consideration, it is an urgent demand of the coke manufacturers to create a universal and effective repairing technique which prolongs the lifetime of the coke ovens of a chamber oven type up to 40 through 45 years or more.
As a method of repairing an oven wall of a coke oven, various conventional methods are known as will presently be described. As disclosed in JP-A No. 206681/1983, a first repairing method uses a lance unit provided at its top end with an optical system including an optical fiber and comprises the steps of inserting the lance unit into a coke oven chamber or a combustion chamber of a coke oven, scanning an oven wall in relation to an absolute position on the oven wall to obtain an image of the oven wall, observing, via the image thus obtained, the oven wall in the coke oven chamber or the combustion chamber to detect a damaged area, and memorizing image data of the oven wall in a memory of a computer together with the absolute position on the oven wall.
As disclosed in JP-B2 No. 17277/1993, a second repairing method uses a heat-resistant protector tube provided with an optical system including an optical fiber or a television camera, and comprises the steps of inserting the protector tube into a coke oven chamber or a combustion chamber, detecting f
REFERENCES:
patent: 4577385 (1986-03-01), Omae et al.
patent: 5378493 (1995-01-01), Zivkovic
Horinouchi Shunji
Ito Hidekuni
Kamegawa Keizi
Kondo Toshio
Matsuda Keiji
Bryant David P.
Kansai Netukagaku Kabushiki Kaisha
Kawasaki Steel Corporation
NKK Corporation
Sumitomo Heavy Industrie's, Ltd.
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