JPH0733541B2 - Transfer control method for heating furnace loading table - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a transfer control method for a charging table when charging a material to be heated into a plurality of heating furnaces.

[Prior Art] As a method for efficiently charging a material to be heated without causing an empty furnace in a conventional heating furnace, for example, there is a slag charging method disclosed in JP-A-61-124517. This technology is a relational expression that inserts the slag thickness, slag unit weight, charging temperature and other slag characteristics into the fuel flow rate required to heat the extraction target temperature for each slag that is charged. This is a method of performing calculation and rearranging and charging the slags to be charged in order from the small value to the large value and from the large value to the small value. When a plurality of heating furnaces are used, they are generally charged alternately. In this way, the idle furnace is prevented, the slag is not overheated, and the fuel flow rate is prevented from abruptly fluctuating to reduce the fuel consumption rate.

[Problems to be Solved by the Invention] By the way, in each furnace of a plurality of heating furnaces, the slag width is usually different, and the conveying speed in the furnace changes depending on the size of the extracted slag. If the extraction pitch of each heating furnace is changed on the way, there is a problem that an empty furnace part is generated in the furnace near the charging port.

Further, in the above-mentioned conventional charging method, it is possible to prevent overheating of the slag and to prevent a sudden change in the fuel flow rate, but this is an effective method when the majority of the charging slag is present in the slab yard. . However, as is the case with the recent so-called direct delivery method of charging a heating furnace from a continuous casting facility in a short time, and when charging to multiple furnaces and the extraction pitch of each heating furnace is different, etc. Does not take into consideration the fact that an empty furnace part is generated in the furnace with a fast extraction pitch and a fuel loss is generated.

The present invention solves such a problem, and provides a transfer control method of a charging table which does not generate an empty furnace portion even for a material to be heated directly sent to a plurality of heating furnaces.

[Means for Solving the Problems] The present invention provides a method of transporting a heating target material, in which heating target materials are sequentially charged into heating furnaces arranged in parallel, the temperature of the materials is kept high, and then the heating materials are extracted. In accordance with the planned extraction order of the heat-treated material that has been put in, the cumulative sum L _S of the sum of the lengths of the heat-treated material in the heating furnace conveyance direction from the extraction end to the charging end and the sum of the heat-treated material intervals is calculated as compared to _F calculates the difference, calculates continue the sum l of loading scheduled furnace conveyance direction length W and the thermal material spacing of the heated material of the heating furnace, each value above (L _F The transfer control method for the heating furnace charging table is characterized in that the transfer order to the heating furnace is determined in the order of satisfying the relationship of −L _S ) ≧ W + 1.

[Operation] In a plurality of heating furnaces provided in parallel, the present invention efficiently charges the next material to be heated without forming an empty furnace in the empty space on the charging side of each heating furnace. There, the value that is calculated empty space for each heating furnace (L F _{-L S),} to convey control the heated material in the charging table to charging the next object to be heated material suitable for this empty space This prevents the generation of an empty furnace in the heating furnace.

[Embodiment] An embodiment of the present invention will be described in the case of two heating furnaces installed in parallel as shown in FIG. In this case, the furnace length is L _F = 6
m, slag interval l is 100 mm.

Reference numeral 1 is a No. 1 heating furnace, 2 is a No. 2 heating furnace, which are attached to the heated materials 3a and 3b charged in the respective furnaces. ing. Reference numeral 4 is a charging table for the material to be heated, and 5 is an extraction table.
Further, Table 1 continues to show the width W of the material to be charged in each heating furnace, the furnace number to be charged, and the order of charging.
Here, the length of each of the heated materials 3a and 3b in the heated material conveying direction, that is, the width W of the heated material is set to a dimension as shown in the drawing, and this W and the heated material interval 1l.
The cumulative _{L S} of the sum calculated in, when it is compared with the thermal material length _{L F,} in the No. 1 furnace _{1, L S = (1200 +} 100) + (1200 + 100) + (1200 + 100) + (1200 + 100) = 5200 L _F -L _S = 6000-5200 = 800 Comparing the width of the heated material of the charging event on this value and the next No.1 furnace 1 _(L F -L _S), does not satisfy the relationship _{L F -L S ≧ W + l} .

In the No.2 furnace _{2, L S = (1200 +} 100) + (1000 + 100) + (1500 + 100) + (1900 + 100) = 6000 L F -L S = 6000-6000 = 0 It is then instrumentation No. 2 furnace comparing the width of the heated material of the input schedule, it does not satisfy the relationship _{L F -L S ≧ W + l} .

Next, if the material to be heated is extracted from the No. 1 heating furnace 1,
L _S = _{3900, and} becomes the _{(L F -L S) = 2100} . Compared to the width of the heated material of the _(L F -L _S) then charged scheduled No.1 furnace 1 the value _of, satisfying the relationship _{L F -L S ≧ W + l} . Therefore, the material to be conveyed next to the material to be heated is the material to be heated, which is charged into the No. 1 heating furnace 1.

Next, when it is calculated that the material to be heated is extracted from the material 2 to be heated, No. 2 is L _S = 4700, and (L _F −L _S ) = 1300. The Compared to the width of the heated material of the charging schedule a value of _(L F -L _S) next No.2 furnace _{2, L F -L S ≧ W} + l
Still not satisfied with the relationship.

Now the heated material is extracted from the No.2 furnace 2, L _F -L S ₌ 2400 becomes about 2 No. furnace 2, which when compared with the width of the heated material, L _F -L _S ≧ The relationship of W + l is satisfied, so that the heated material is conveyed next to the heated material.

Now the heated material is extracted from the No.1 furnace 1, _{L S} = 3900 becomes in No.1 _{furnace, (L F -L S) =} 21
It becomes 00. Compared to the width of the heated material of the charging schedule this value next No.1 furnace 1, satisfying the relationship _{L F -L S ≧ W + l} , after of the heated material is therefore Hinetsuzai 13 Will be transported.

Similarly, if the charging sequence of the subsequent heated materials is calculated in accordance with the extraction of the heated materials in the same manner, Becomes

In the above-mentioned embodiment, the case where two heating furnaces are arranged in parallel has been described, but in the case of three or more heating furnaces, the order of carrying to each heating furnace can be sequentially determined by the same procedure.

[Effects of the Invention] As described above, according to the present invention, the length of the empty space portion on the charging side of each heating furnace and the width of the material to be charged to be charged are always compared, and the empty space portion is extracted according to the extraction. Since the material to be heated is controlled to be transferred on the charging table so that the material to be heated is transferred in the order satisfying the relationship that enables charging, the material to be heated can be used even when a plurality of heating furnaces are used in parallel. The heating material can be charged smoothly because it is not affected by the extraction pitch and the width of the material to be charged, and there is no imbalance of charging or empty furnaces between heating furnaces. The fuel consumption rate can be reduced with stable operation of the heating furnace.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a heating furnace arrangement for explaining the present invention. 1,2 …… heating furnace, 3a, 3b …… heated material, 4 …… charging table, 5 …… extraction table

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Shitamachi 1 Kimitsu, Kimitsu City, Chiba Shin Nippon Steel Co., Ltd. Kimitsu Works (56) References JP-A-58-123828 (JP, A)

Claims (1)

[Claims] 1. A method of transporting a material to be heated, wherein the material to be heated is sequentially charged into heating furnaces arranged in parallel, the temperature of the material is kept high, and then the material is extracted.
Cumulative L of the sum of the lengths of the heating target material in the heating furnace conveyance direction from the extraction end to the charging end and the sum of the heating target material intervals according to the scheduled extraction order of the heating target materials charged into each heating furnace. _S heating furnace length L _F
Then, the difference is calculated, and the sum l of the length W of the heating target material to be charged in each heating furnace in the heating furnace conveyance direction and the interval between the heating members is calculated.
And the above respective values are (L _F −L _S ) ≧ W + 1
The method for controlling the transfer of the heating furnace charging table is characterized in that the transfer order to the heating furnace is determined in the order in which the relationship is satisfied.