JPS6327594A - Operation of coke oven - Google Patents

Abstract

PURPOSE:To control the content of volatile component in carbonization to an optimum level and to properly control the yield of coke, by adjusting the ratio blending coals according to the weight ratio of coal charged in a coke oven to the produced coke. CONSTITUTION:Weight of charged coal and that of produced coke per one chamber of a coke oven weighted by a load cell provided to a hoist crane for charging coal into a quenching tower. The blending ratio of coals is adjusted based on the weight ratio of the charged coal to the produced coke determined by the load cell. EFFECT:The deviation of the composition of charging coal during transportation is investigated and the pushing load of coke can be reduced by taking a proper countermeasure. Furthermore, the coking operation can be carried out under optimum condition while preventing the excessive deposition of carbon to the wall of coke oven.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating a coke oven that appropriately manages coke yield in the coke oven.

[Conventional technology and its problems]

Control of coke yield in coke production is extremely important in coke oven operation. That is,
The coke yield changes depending on the volatile content in the coal. For example, when the volatile content is low, the coke yield increases, and in the worst case, there is a large increase in the resistance when extruding red hot coke from the coke oven carbonization chamber. Well, sometimes it doesn't get pushed out.

In addition, the by-product gas generated during coal carbonization has a high calorific value, and is used as fuel for each metallurgical furnace in steel plants. For this purpose, I sometimes perform the t!4vi of Volatile Yari.

On the other hand, an increase in volatile content may increase carbon adhesion to the coke oven carbonization chamber during carbonization and may clog gas riser pipes, charging holes, etc.

Furthermore, from the point of view of coke oven operation, if sufficient coal carbonization time is not ensured, the volatile content in the coal will not be completely gasified and will be generated.
- It remains in the gas, leading to a decrease in coke strength.

Therefore, although analysis has been carried out to determine the appropriate setting of the volatile content in charged coal and to understand the actual value against the set value, In factories that do this, the frequency is once per 8 hours, and there is a problem with its representativeness.

As a coal carbonization method that appropriately controls such a yield, for example, as shown in Japanese Unexamined Patent Publication No. 176386/1986, a method is proposed in which the product of the volatile content value and the effective carbon content of the blended coal is below a predetermined value. Blending raw coal into carbonization and removing excessive coal from the furnace wall? There are some things that can prevent adhesion.

The coke yield is determined from the amount of coke produced (dry weight)/the amount of coal charged (dry weight). Moisture is also measured regularly, but the amount of coke produced is difficult to determine, for example, in conventional wet fire extinguishing, coke is discharged from a coke wharf, so coke from multiple windows is mixed in the coke, so the amount of coke produced per carbonization chamber is It was difficult to understand. In addition, we installed a Merrick School on the conveyor directly below the coke wharf, or installed weighing equipment such as a load cell on a fire truck, but due to weighing accuracy, slippage of the belt conveyor, uneven loading of coke, etc., accurate production was not achieved. Weighing the amount of coke was nearly impossible.

In view of these circumstances, the present invention provides a method for operating a coke oven in a stable manner by accurately weighing the amount of coke produced and setting an appropriate coke yield.

[Means and effects for solving the problem] The gist of the present invention is to measure the amount of charged coke and the amount of coke produced per 1 kiln of a coke oven, and calculate 1. Determine the weight ratio of the charcoal to the coke produced in the above unit.

It is characterized by adjusting the blend of coal types based on this weight ratio to appropriately control the carbonized volatile content. This is done using a weight detector.

In other words, as mentioned above, the coke yield "1" is determined from the coke production amount (dry weight)/coal charging amount (dry weight), and the estimation formula is coke yield 1) = f (charging amount). Volatile content of input coal)...
(1). Therefore, if the amount of coal charged (dry amount) and the amount of coke produced (dry amount) can be accurately determined, the coke yield will be closely related to the volatile content of the charged coal. By knowing the volatile content of the coal input, adjust its blending ratio, control the carbonization volatilization to achieve an appropriate yield, and determine the power of the carbonization chamber. It is possible to reduce the amount of coke adhesion and eliminate problems such as clogging, troubles, etc., and enables stable coke operation.

- In order to understand the amount of coke produced in black, in recent years, coke extinguishing equipment has shifted from wet extinguishing equipment to dry extinguishing equipment in order to recover the sensible heat retained by red-hot coke in order to save energy. When charging red-hot coke into a fire extinguishing tower, the entire amount of red-hot coke discharged from one kiln is generally packed into coke packets, transported by a trolley, hoisted by a crane, and charged from the top of the fire extinguishing tower. ing.

If a load cell, for example, is installed as a weight detector on the hoisting wire of the crane, the dry amount of produced coke in a single black area can be accurately measured. In this way, if we can determine the amount of coke produced in the black scale, we can accurately determine the charged amounts of the black scale and the black scale using conventional weighing equipment, and the weight ratio of the two can be determined, and the coke yield ratio can be calculated as described above. It has a freezing effect and can be estimated with high accuracy from equation (1). In addition, it also has the function of obtaining the coke production amount by cumulatively adding up the amount of coke produced in each kiln, which is weighed with a weight detector attached to a crane for dry fire extinguishing equipment.

〔Example〕

The amount of coal charged for one kiln was weighed using a load cell mounted on the charging vehicle, and this was corrected for moisture to accurately determine the dry amount. As shown in Figure 1, the carbonized coke is
The carcass is placed in a coke packet 1, transported by a trolley 2, and lifted up by a crane 3 to be loaded into a dry fire extinguishing tower. Here, the weight was measured using a load cell 5 installed on the fixed end side of the lifting wire 4 of the crane 3. The dry weight of produced coke is expressed as the weight of the coke packet containing the produced coke minus the weight of the empty packet, so the weight is measured at the time of hoisting.

Measurements were taken twice while hanging. In addition, by carrying out the test while the crane 3 was moving horizontally with almost no vibration or acceleration, it was possible to accurately determine the weight of produced coke.

In this way, the weight of charged coal (dry weight) and the weight of produced coke!
(dry weight) was weighed and the coke oven was operated.

As mentioned above, the coke yield is expressed as a function of volatile content, so the yield based on this estimation formula is
Yields determined by actual field measurements must match. However, in actual operation, as mentioned above, differences often occur due to confounding factors such as the representativeness of the sample for measuring the volatile content in the charged coal, fluctuations in coke oven operation, and errors in the estimation formula.

The method of the present invention was carried out for the blends of coal types shown in the table below.

table Figure 2 shows the change in volatile content in coal over time.

Previously, the set value of volatile content in charged coal, calculated from the volatile content of single coal, was measured and controlled by analysis of the charged coal, but the burden of coke extrusion was heavy. But e
The variation was as indicated by the mark. On the other hand, the x mark indicates the volatile content determined from the yield by weighing according to the method of the present invention, and is the average volatile content of 10 kilns. As is clear from this figure, the volatile content has decreased, and an operational abnormality is clearly recognized. Based on these results, we were able to check fluctuations in coke oven operation, investigate segregation during the charging coal transportation process, and take countermeasures to reduce the extrusion load. In addition, it was possible to perform proper coking operations while preventing excessive carbon adhesion to the furnace walls.

〔Effect of the invention〕

As explained above, according to the method of the present invention, the ratio between the weight of charged coal and the weight of produced coke can be detected with high accuracy, making it possible to accurately grasp the coke yield. This is an excellent invention in terms of coke production because it enables stable coke oven operation by adjusting the amount appropriately.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of detection of the weight of produced coke in an example, and FIG. 2 is a diagram of changes in volatile content in coal over time in the same example. l... Coke packet, 2... Trolley, 3... Crane, 4... Wire, 5... Load cell. Figure 1

Claims (2)

[Claims] (1) Weigh the amount of charged coal and the amount of coke per kiln of the coke oven, determine the weight ratio of the charged coal to the coke produced, adjust the blend of coal types from the weight ratio, and carbonize it. A method of operating a coke oven characterized by appropriately controlling volatile matter. (2) A method for operating a coke oven according to claim (1), characterized in that the amount of coke per oven is measured using a weight detector installed on a lifting crane that charges the dry fire extinguishing tower. .