JPH078984B2 - Edge flue temperature raising method in coke oven - Google Patents

Description

The present invention relates to a method for raising the temperature of end flue in a single-stage combustion type coke oven.

(Prior art) In a single-stage combustion type coke oven, when controlling the wall temperature distribution in the flue (combustion chamber) in the furnace height direction, the flue port is opened by the flue port port damper installed at the flue bottom. By changing the hole area and adjusting the jet speed that affects the combustion condition, the wall temperature distribution in the furnace height direction according to the purpose is obtained.

Also, in order to raise the temperature of the end flue, only the combustion gas,
Alternatively, the present applicant previously filed Japanese Patent Application No. 62-2051 (Japanese Patent Laid-Open No. 63-
There is also a method proposed in JP-A-135485) in which both fuel gas and combustion air are introduced.

(Problems to be Solved by the Invention) However, it is very difficult to change each flu port opening area in accordance with a change in load factor (heat input amount) or a change in air ratio, furnace pressure, or the like. Especially for the end flue, there is a large amount of heat radiated from the furnace wall, and an arbitrary wall temperature distribution in the furnace high direction cannot be obtained simply by adjusting the port damper. Variations in quality occur due to unevenness. Further, in order to improve this variation, the flue in the central portion requires an excessive amount of dry distillation time, which in turn causes an increase in the amount of dry distillation heat, which causes an obstacle to energy saving.

Further, even if only the fuel gas and the combustion air are introduced in the furnace height direction, it is effective in raising the temperature of the nozzle insertion part, but the wall temperature distribution pattern in the flue that matches the operating conditions is It is not obtained, and the effect is insufficient for quality variation and reduction of dry distillation heat quantity.

The present invention aims to provide a method for raising the temperature of the end flue of a coke oven that can solve the above problems.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention is directed to a fuel gas nozzle such that respective ejection holes face each other at appropriate positions in the respective end flues on the extruder side and the digestion wheel side. Based on the ejection angle from both nozzles and the wall temperature distribution in the flue that are obtained in advance, the nozzles for combustion need to be inserted and arranged in the range of 0 to 90 ° in the direction of these nozzles and both sides of the carbonization chamber. It is to rotate.

In the present invention, the reason why the rotation range of both nozzles is set to 0 ° to 90 ° is that if it exceeds 90 °, the combustibility becomes remarkably unstable (the exhaust gas O ₂ concentration varies greatly) and the end flue is This is because the wall temperature distribution according to the purpose cannot be obtained.

(Operation) In the method for raising the temperature of the end flue of the single-stage combustion type coke oven, the present invention is arranged so that the respective ejection holes are opposed to each other at appropriate positions in the end flues on the extruder side and the digester side. A gas nozzle and a combustion air nozzle are inserted and arranged, and based on the ejection angle from both nozzles and the wall temperature distribution at the flue that have been obtained in advance, these nozzles are placed in the range of 0 to 90 ° in the direction of the carbonization chamber on both sides. It is to rotate, by which the combustion form can be arbitrarily changed from rapid combustion to slow combustion,
The wall temperature distribution pattern in the flue in the furnace height direction can be selected according to the purpose.

Further, by adjusting the heat input amount, it becomes easier to change the wall temperature distribution pattern.

(Example) The present invention will be described below based on an example shown in FIG.

The drawing is a schematic cross-sectional view of an end flue portion to which the method of the present invention is applied. In the drawing, reference numeral 1 denotes a combustion air nozzle which is inserted at a predetermined height from the flu bottom and blows combustion air into the end flue 2. Reference numeral 3 also designates a fuel gas nozzle for blowing combustion gas. These air nozzle 1 and fuel gas nozzle 3 are also provided.
The ejection holes 4 and 5 are arranged in the end flue 2 so as to face each other.

The two nozzles 1 and 3 can be rotationally positioned within a range of, for example, 0 ° to 90 ° by an appropriate mechanism such as, for example, motors 6 and 7 and gears 8 and 9 capable of rotating in the forward and reverse directions.

In the figure, 10 is the fuel port that constitutes the flue port,
11 is a combustion air port, and 12 is a port damper.

For example, in an end-flue combustion air model (similarity ratio K = 0.7) with a furnace height of 3 m, a furnace width of 370 mm, and a furnace length of 190 mm, burn with the air nozzle 1 at a distance of 210 mm at a position 420 mm from the flu bottom. The gas nozzle 3 is inserted and arranged, and the ejection angles of these nozzles 1 and 3 are 0 ° (right side) (dotted line in FIG. 2), 30 ° (same dashed line), 60 ° (same two-dot chain line), 90 ° ( FIG. 2 shows the wall temperature distribution due to the temperature rise of the end flue when it is changed to (directly above) (the same broken line) together with the case where only the conventional flue port is used (solid line in FIG. 2). In this case, the base heat input was 27600 kcal / h (COG = 6.0 Nm ³ / h) and the heat gain was 29.5% (8140 kcal / h).

In the present invention, the wall temperature distribution due to the above-described edge flue temperature rise is obtained in advance, and the rotation angles of both nozzles 1 and 3 are set based on this wall temperature distribution so as to obtain an optimum wall temperature pattern. While raising the temperature.

By the way, when the temperature of the end flue was raised based on the wall temperature distribution shown in Fig. 2, 1) the dry distillation heat quantity was 15 kc due to the average furnace temperature reduction due to the improvement of the end flue furnace high temperature distribution.
Al / kg coal can be reduced. 2) Variations in quality have also been greatly reduced by improving the kiln burnout failure.

(Effects of the Invention) As described above, according to the present invention, by rotating both nozzles, a combustion mode suitable for the purpose is obtained, and the end flue is introduced so that the dry distillation time is commensurate with the flue in the central portion. The amount of heat can be adjusted to eliminate the uneven burning of coke.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an end flue part to which the method of the present invention is applied. (A) is a plan view, (b) is a front view, and FIG. 2 is a drawing showing an example of wall temperature distribution due to end flue temperature rise. Is. 1 is an air nozzle, 2 is an end flue, 3 is a fuel gas nozzle, and 4 and 5 are ejection holes.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-62-62888 (JP, A) Actually opened 62-21048 (JP, U) Actually opened 62-21049 (JP, U)

Claims (1)

[Claims] 1. In a method for raising the temperature of an end flue of a single-stage combustion type coke oven, a fuel gas nozzle is provided at an appropriate position in each end flue on the extruder side and the digestion car side so that respective ejection holes face each other. Combustion air nozzles are inserted and arranged, and both nozzles are rotated in the carbonization chamber direction on both sides in the range of 0 to 90 ° based on the ejection angles from both nozzles and the wall temperature distribution in the flue that have been obtained in advance. An edge flue temperature raising method in a coke oven, which comprises: