JPS5976650A - Sensible heat recovering device for continuous casting machine - Google Patents

Abstract

PURPOSE:To provide a titled sensible heat recovering device which improves a heat recovering rate by passing a refrigerant in a roll supporting frame and preheating the same prior to supplying the refrigerant in the refrigerant passage in each roll or a sensible heat recoverer between the rolls. CONSTITUTION:Pure water as a refrigerant is supplied 9 from a feed water tank 8 to a supporting frame 6 to preheat the frame and is thereafter returned into the tank 8. The pure water in the tank 8 heated to 70-100 deg.C by the circulation of the refrigerant is supplied 10, 12, through a steam sepn. drum 11, to rolls 1, 3 and a sensible heat recoverer 5, from which the steam at about 170 deg.C is returned to the drum 11 and steam is drawn from the drum. The pure water in the frame 6 is set at <=100 deg.C. The reason for setting the pure water at said temp. lies in that the frame 6 is positioned apart from a billet as compared to the rolls 1, 3 and therefore if the pure water is heated to <=100 deg.C, the efficiency is deteriorated. The threshold for deterioration of the grease for the bearing in the roll is usually about 200-220 deg.C, whereas the hot water running in the roll is 170 deg.C at which the life of the bearing is maintained without being spoiled. The device is so arranged as to control the flow rate of the water to be introduced, etc. so as to control the water to such temp.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is directed to a sensible heat recovery device for a continuous manufacturing machine.

In a continuous casting machine, a radiant heat recovery device consisting of a group of water tubes is disposed between the rolls and the rolls, each having a refrigerant passage formed inside the fourth layer, to recover the sensible heat of the slab. Furthermore, the frame supporting the rolls is internally cooled with a jacket to prevent the temperature from rising due to heat radiated from the slab. The cooling water for the engine is normally closed, and is supplied to the frame from the reservoir with a pump, cooling the 7 frames before returning to the reservoir. The water temperature supplied to the frame is 20-35℃, and the water temperature returns to the reservoir.
Generally, the temperature is 40 to 55°C. In order to prevent the temperature of this cooling water from becoming too high, the current situation is to widen the area of the boule to dissipate heat, or to install a cooling tower or the like to cool the boule.

This "J #i" was created in consideration of these circumstances, and its purpose is to remove refrigerant from the roll support frame before supplying refrigerant to the refrigerant passage in the roll or the sensible heat generated between the rolls. The objective is to preheat the refrigerant by passing it through the entire interior of the refrigerant, thereby improving the heat recovery rate.

The following is an explanation based on a collection of examples illustrating this invention.
It's true. As shown in FIG. 1, between the n-type M and the vinyl roll l, a large number of steel chevrons 2 are arranged in six curves. It has a casting iron Sf and guides and supports it.

The guide roll 3 and pinch roll 1 of the roller apron 2 are coated with a cold IJI that passes through the inside from one end to the other.
An A-progress M4 is immediately installed (see Figure 2).

Further, between each roll of the roller apron 2 and the pinch roll 1, a heat recovery device 5 capable of recovering radiant heat of a small fN'J, such as a plurality of heat collecting pipes 5A, is installed so as to close the space between the rolls. It is arranged.

Further, the guide roll 3 and the pinch roll l'@: supporting support frame 6, which is made of GYKET, and a frame passage 7 are formed.

In such a configuration, pure water is used as a refrigerant,
This pure water is first supplied from the water supply tank 8 to the support frame 6 by the circulation pump 9, and after being preheated, returns to the water supply tank 8. Due to the circulation of this refrigerant, the pure water in the water supply tank 8, which has reached a temperature of 70 to 100°C, is sent to the circulation pump 12 through the air-water separation drum 11t by the supply pump 10, and then to the siroll 1.
3 and the heat recovery recovery unit 5, and returned to the steam/water separation drum 11 as steam at about 170°C, where the steam is taken out.

Here, the temperature of the pure water in the support frame 6 is set to 100° C. or higher. This is because the temperature of 70°C is farther away from one piece than in a roll, so the efficiency deteriorates when the temperature exceeds 100°C.

Furthermore, the grease for the roll bearings is 11a, usually about 200~
The limit of deterioration is 220℃, but the hot water that passes through is about 170℃
This will not impair the life of the p1 bearing. In addition, the use of pure water as a refrigerant causes much less corrosion of the frame, etc., than industrial water. This reduces the amount of energy used and extends the lifespan of the machine.

In addition, the roll arrangement is dense, and there is jF+ ? between the rolls. There are some PM recovery stages 1 to 4, but in this case, there is a heat and t that passes the preheated refrigerant only through the cold cage passage of the roll.
, 1. @No need.

In addition to the above, according to the present invention, the refrigerant is preheated by the roll support frame before being supplied to the rolls or sensible heat recovery, so the heat recovery rate is improved.

[Brief explanation of drawings]

ffs I1 is a longitudinal 1) front view showing the R1 heat recovery device according to the present invention, and the 21st line is a system diagram of a similar device. l...pinch roll, 2...low chevron, 3...gaid roll, 4...
- Refrigerant jlTl: 1144 Wis 5... Crystallization recovery revenue, 5A... Heat collection tube, 6... Support frame, 7... Frame cooling path, 8...・
...Water tank, υ...Circulation pump, 10...
...Feed pump, 11... Air-water separation drum, 12... Circulation pump.

Claims (1)

[Scope of Claims] <1) ＾・5 piece 111al M (Roll l that guides and supports the casting liquid in S) 3 has cold p1 outlet passage silk, the eye-
Le's support claim in ekoru-^ cooling yvS planning, rl
1.) A sensible heat recovery device for a continuous casting machine, characterized in that after the medium is poured into the roll, the medium is supplied to the i-ru. (2) HtJ heat + which can fully recover the radiant heat of the slab in the four-ru 11;j that guides and supports the slab in the slab jLQ i gate
i71)t'Z. The stagnation resistance r11'' is crossed, and the refrigerant is passed through the roll l'3. '?
r N'11. '@: A sensible heat recovery device for an ipμ continuous casting machine, characterized in that after passing through the sensible heat recovery device, it is supplied to the sensible heat recovery device or rolls.