JPH07242876A - Method for feeding high-temperature dry distillation gas in dry distillation oven - Google Patents

Abstract

PURPOSE:To provide a method by which it is prevented that a temperature deviation is developed within horizontal section in the low temperature dry distillation zone of a dry distillation oven for producing formed coke by directly heating formed coal through two-tiered upper and lower tuyeres, and formed coal descended through a high-temperature zone develops swelling or shrinkage crack due to rapid temperature rise. CONSTITUTION:The difference between the temperature of a high-temperature region 105 of high-temperature gas distributed in a low-temperature dry distillation zone and the temperature of a low-temperature dry distillation gas fed from a low-temperature tuyere 36 is detected, and the feed of the high- temperature dry distillation gas fed from a high-temperature tuyere 37 is controlled so that this difference come to a level at or below a set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a continuous forming coke oven, and more particularly to a method for supplying high temperature carbonization gas in a carbonization furnace.

[0002]

2. Description of the Related Art A process flow of a continuous forming coke oven is shown in FIG. As shown in FIG. 1, in the molding step 10, coal powder 11 is dried 12, crushed 13, kneaded 14, molded 15
Through the above process, a briquette 16 formed by adding a binder is manufactured. In the carbonization step 20, the formed charcoal 16 is charged into the carbonization furnace 100 from the furnace top. This forming coal is directly heated in the carbonization furnace 100 by the low temperature carbonization gas supplied from the low temperature tuyere 36 in the upper stage and the high temperature carbonization gas supplied from the high temperature tuyere 37 in the lower stage, and while descending in the furnace, It is continuously carbonized. The dry-distilled forming coal is cooled in the lower part of the furnace, and then discharged as forming coke 21 outside the furnace.

Next, the dry distillation gas system 30 will be described.
The dry distillation gas discharged from the top of the dry distillation furnace 100 is cooled 31
It is collected and collected 32, but a part of it is circulated in the dry distillation furnace. There are three routes. The high temperature gas introduced from the high temperature tuyere 37 via the heating device 33, the low temperature gas introduced from the low temperature tuyere 36 via the heat exchanger 34 and the ejector 35, and the cooling tuyere 38 to the lower part of the carbonization furnace. It is a cooling gas.

In the above process, the forming coal that descends (passes) through the low temperature carbonization zone 101 above the carbonization furnace 100 is
It is necessary for the operation of the furnace that the temperature is raised (heated) so that blistering cracks due to abrupt heating (temperature rise) do not occur and coke is made in the high temperature carbonization zone 102. for that purpose,
Uniform temperature distribution in the horizontal cross section of the low temperature carbonization zone 101,
That is, a small temperature deviation is required.

[0005]

In the conventional high-temperature carbonization gas supply method, the temperature deviation occurs in the horizontal cross section in the low-temperature carbonization zone, and the briquette that has dropped in the high temperature portion is
There is a problem that blistering cracks and shrinkage cracks occur due to a sudden rise in temperature. SUMMARY OF THE INVENTION It is an object of the present invention to provide a high temperature carbonization gas supply method which eliminates the temperature deviation in the horizontal cross section in the low temperature carbonization zone in order to solve the above problems.

[0006]

FIG. 2 is a vertical cross-sectional view of the gas flow in the dry distillation furnace 100, and FIG. 3 is a cross-sectional view thereof. According to the results of the investigations and studies conducted by the present inventors, as shown in FIGS. 2 and 3, the low-temperature carbonization gas 104 supplied from the low-temperature tuyere 36 to the carbonization furnace 100 and the high temperature supplied from the high-temperature tuyere 37. The dry distillation gas 105 does not mix uniformly, and the high temperature dry distillation gas 105 rising from the bottom of the furnace is blown to the center of the furnace by the low temperature dry distillation gas 104 supplied from the low temperature tuyere 36.
At the upper part of the low temperature tuyere 36 (low temperature carbonization zone 101), a low temperature carbonization gas 104 temperature region and a high temperature carbonization gas 105 temperature region are generated. It was confirmed that this is a temperature deviation in the horizontal plane and causes cracking of the forming coal. The present invention has been completed based on the above findings.

According to the present invention, in the operation of a carbonization furnace for continuously forming carbonized coal by directly heating the formed coal by direct heating with two upper and lower tuyeres, the temperature of the core portion at the low temperature tuyere and
A high-temperature carbonization gas supply method in a carbonization furnace characterized by detecting a difference from the temperature of the low-temperature carbonization gas and controlling the supply amount of the high-temperature carbonization gas so that this temperature difference matches a predetermined set value. is there.

[0008]

The structure and operation of the present invention will be described below with reference to FIG. The temperature (T _h ) in the center of the furnace above the low temperature tuyere 36 is detected by the thermometer 111, while the temperature (T _C ) of the low temperature carbonization gas supplied from the low temperature tuyere 36 is detected by the thermometer 110. The temperature difference (ΔT = T _h −T _C ) is calculated by the calculation / control device 112 from both detected temperatures, and this temperature difference (ΔT)
Control valve 1 for adjusting the high-temperature carbonization gas supplied from the high-temperature tuyere 37 so that the temperature falls within a predetermined target temperature difference (set value).
13 to control the supply amount of the high temperature carbonization gas.

By performing the above control, the temperature deviation in the horizontal cross section in the low temperature carbonization zone is reduced, and the briquette coal that descends in the low temperature carbonization zone in the carbonization furnace is prevented from cracking due to rapid heating.

[0010]

EXAMPLE The present invention was carried out with the configuration shown in FIG. 4, the temperature difference (ΔT) was set to 20 ° C., and the supply amount of the high temperature carbonization gas 105 was controlled so that ΔT ≦ 20 ° C. The temperature deviation of the horizontal cross section in the low temperature carbonization zone was smoothed at 20 ° C. or less as shown in FIG.

The temperature distribution in the furnace height direction at the center of the furnace is
As shown in FIG. 6, a rapid temperature rise in the low temperature carbonization zone was eliminated, an appropriate temperature distribution was obtained, and cracking of the forming coal due to a rapid temperature rise was prevented.

[0012]

According to the present invention, since the supply amount of the high temperature carbonization gas is controlled so that the temperature deviation in the horizontal cross section in the low temperature carbonization zone is suppressed within the set value, no matter what the flow rate of the forming coal in the furnace goes down, It became possible to maintain an appropriate heat pattern, and it became possible to manufacture molded coke without blistering cracks and shrinkage cracks, and the yield improved by 2%. Also,
Since the excessive supply of high-temperature carbonization gas is eliminated, there is an effect that it is advantageous in terms of thermo-economy.

[Brief description of drawings]

FIG. 1 is a process flow diagram of a continuous forming coke manufacturing apparatus. Note that FIG. 1 shows both a front view and a side view of the carbonization furnace 100.

FIG. 2 is a vertical cross section showing a gas flow in the central portion of the tuyere of the carbonization furnace.

FIG. 3 is a horizontal cross section of a low temperature tuyere of a carbonization furnace.

FIG. 4 is a flow chart of a high-temperature carbonization gas supply amount control flow chart of the present invention.

FIG. 5 is a chart showing the temperature of the cross section of the central part of the tuyere of the carbonization furnace.

FIG. 6 is a graph showing a temperature history associated with descent in a forming coal furnace.

[Explanation of symbols]

 36 low temperature tuyere 37 high temperature tuyere 100 carbonization furnace 104 low temperature region of low temperature carbonization gas distribution 105 high temperature region of high temperature carbonization gas distribution 110, 111 thermometer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidetaka Suganabe 1 Kawasaki-cho, Chuo-ku, Chiba City, Kawasaki Steel Co., Ltd. Inside the Steel Works (72) Tsuneo Aihara, 1 Kawasaki-cho, Chuo-ku, Chiba City Inside the Chiba Works, Kawasaki Steel Co., Ltd.

Claims (1)

[Claims] 1. In the operation of a carbonization furnace in which formed coal is continuously carbonized by direct heating of two upper and lower tuyeres to produce molded coke, the temperature of the core at the low temperature tuyere and the temperature of the low temperature carbonization gas are measured. Is detected, and the supply amount of the high-temperature carbonization gas is controlled so that the temperature difference matches a predetermined set value, a high-temperature carbonization gas supply method in a carbonization furnace.