Principles for adjusting small springs in 5.5-meter coke ovens
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This post was last edited by 【Coking】Chang Jiangning on 2016-12-9 20:01. What are the principles for adjusting the small springs on large furnace columns? We usually adjust the vertical and horizontal tension bars; the small springs are rarely adjusted. If adjustments are needed, what are the basic criteria?
It depends on the age of your furnace; if it’s over 5 years, there will be less need for fine spring adjustments
Both large and small springs are pressed to specified tonnage values using presses upon leaving the factory; each spring is assigned a number along with a corresponding chart, and by using the furnace column curve diagram, it is possible to determine the basis for adjusting the smaller springs
The increase in tonnage for every 1 millimeter of compression can be found in the pressure gauge provided by the manufacturer. What I don’t understand is what tonnage each coil spring should maintain; I can’t find any information on that. For example, when heating the furnace, what tonnage should each series of springs maintain at different temperature ranges? Once the tonnage is known, the compression amount (or height after compression) can also be determined.
The adjustment amount for each line can be calculated based on the expansion rate you determine; there’s a formula for that
During furnace drying, the adjustment of large and small springs is done frequently; it should be based on the expansion rate
The technical parameters of the furnace protection iron components are determined by the design institute
Could you explain in detail how to calculate the adjustment amount for each line based on the established expansion rate? For example, if the combustion chamber temperature is in the range of 200–225°C and the maximum expansion rate in zone 3 is 0.137%, then the calculated number of days is 0.137 ÷ 0.05 = 3.9 days. With a period of 4 days, the daily temperature rise in the combustion chamber is (225–200)÷4 = 6.3°C, and the maximum daily expansion rate is 0.137÷4 = 0.034%. Can the tonnage of the spring be determined based on the above?
The pressure exerted by this spring on the furnace body is calculated based on the expansion rate of the coke oven at various temperatures. In simple terms, the spring is used on the components that protect the furnace, thereby preventing the coke oven from expanding freely and avoiding the breakdown of silicon bricks. This expansion coefficient of the coke oven is essentially the expansion coefficient of silica bricks; the protective pressure exerted on the iron components used to protect the oven is determined through mechanical modeling. This is my own understanding, and for precise details, it’s best to consult professional designers.