JPS609236B2 - Sensible heat recovery method for melt water using laminar flow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of recovering sensible heat of melting using a laminar flow, and more particularly to a method of effectively collecting reflected heat and conductive heat simultaneously using a laminar flow of melting fluid.

Generally, there are the Misakubo method and the Dryvit method as methods for treating iron slag made mainly from blast furnace birch. The water method is a method in which molten slag is rapidly cooled and pulverized by pouring it into a large amount of running water, and the disadvantage is that the head heat of molten slag is not utilized at all, and the use of the slag that has been soaked in water is limited to an extremely narrow range. There is. Furthermore, in the Dryvit method, the sensible heat possessed by Ayanori was only wasted and dissipated into the atmosphere, and there are very few examples of this being recovered and used industrially. However, the melting temperature is usually still around 1200o when transported to the dry bit.
Since it has a high temperature of 0, it is extremely important from a thermoeconomic perspective to recover and utilize that sensible heat. The present inventors have researched a series of methods and devices for recovering melt-tempered sensible heat using the Dryvit method, and have been able to recover the sensible heat to some extent effectively. The amount of heat absorbed by Dryvit from a cave-in can be roughly divided into the amount of heat dissipated into the atmosphere through fin radiation, and the amount of heat lost through the floor surface by conduction, but normally the amount of heat recovered by the Dryvit method is The former is only radiated heat from the neck, and it is extremely difficult to recover heat from the floor surface in a normal dry bit because 9E heat is applied in multiple layers, and its thermal conductivity is also extremely high. The purpose of the present invention is to convert the amount of heat possessed by molten birch into radiation heat dissipated into the atmosphere,
It is an object of the present invention to provide a sensible heat recovery method for welding that can effectively recover conductive heat conducted to the floor surface at the same time.

In the present invention, a cooling plate having a built-in heat medium supply pipe is provided so as to be inclined from the supply side to the discharge side of the melting chain, and a heat exchanger consisting of a heat medium supply pipe and a reflection plate is installed above the cooling plate. The molten liquid is poured onto the inclined cooling plate to form a thin layer, and the thin layer is cooled and solidified to be crushed and removed in lumps, and then the molten liquid is poured onto the cooling slope again. This is a method for recovering the sensible heat of a melt using a thin laminar flow, which is characterized by collecting the sensible heat of the molten ripple by repeatedly performing the step of flowing a thin layer to form a thin layer.

According to the experiments conducted by the present inventors, the thermal conductivity of the slag once solidified is low, and the melting temperature shrinks due to solidification.
It was discovered that an air layer is formed between the cooling plate and the solidification law, and that even if welding wire is flowed above the solidification law, the amount of heat conducted to the cooling plate is extremely small. When attempting to effectively recover both the radiation heat from the top surface and the conductive heat from the floor surface, the solidification chain must be crushed and removed each time after the melting process has been applied and heat recovery has been completed. It has been found that performing heat recovery using a single-layer flow of constantly fresh molten birch is the most effective way to recover conductive heat.

Therefore, in the present invention, the melt flow is made into a laminar flow, a heat exchanger is provided at the top, a cooling plate is provided at the bottom, and a heat medium such as water or air is passed through bent pipes provided inside each. The sensible heat of the melting principle was recovered by the heating.
Therefore, the apparatus according to the present invention includes a plurality of heat exchangers having reflective plates as a radiation heat recovery device, a cooling plate having an internally bent pipe as a conductive heat recovery device, and a solidification and crushing device. The coagulation birch crushing apparatus is, for example, a high-pressure water injection device at the bottom of a heat exchanger, or a plurality of cooling plates that are moved in conjunction with each other by arms, thereby adjusting the coagulation rate on each cooling plate. It is desirable to have a device that is capable of crushing. Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a schematic cross-sectional view of a sensible heat recovery device to which the present invention is applied. In the figure, melt 1 loaded in a welding ladle and transported from a blast furnace or the like is flowed by a melting gutter 2 or the like onto a cooling plate 3 which becomes an inclined gutter.

A plurality of heat exchangers 4 are provided above the cooling plate 3. As shown in FIG. 1, the heat exchanger 4 includes a bent pipe 5 at the bottom and a reflector plate 6 provided at the top of the pipe 5 in close proximity to the pipe 5 to absorb the fin radiation heat from the rockfall 1 flowing on the cooling plate 3. The heat medium such as water captured and flowing through the pipe 5 is heated. On the other hand, the conductive heat of the melt 1 flowing on the cooling plate 3 heats a heat medium such as water flowing in a bent pipe provided inside the cooling plate 3. As shown in FIG. 3, the cooling plate 3 is preferably a cast iron plate having a bent pipe 16 inside. The heat exchanger 4 has a hinge on one side, as shown in FIG.
The forehead can be moved freely by other suitable methods.

This is for convenience when repairing the heat exchanger 4 or removing coagulated dirt. It is equipped with a coagulation birch crushing device to crush and remove the coagulation law each time after heat exchange. As the continuous solidification and crushing device, the following devices are desirable. That is, a high-pressure water injection nozzle 11 is provided on the lower surface of the heat exchanger 4 in order to crush and remove the coagulation law in the form of lumps and promote cooling of the low-temperature slag after heat recovery, or As shown in the figure, the cooling plate 3 is divided into a plurality of pieces, and each cooling plate has a stepped scarf joint, with the green ends diagonally overlapping each other, and both ends perpendicular to the flow direction of the melt 1. It has a rotating shaft 12, each rotating shaft 12 has a respective moving arm 13, and the moving arm 13 is connected to a rod 15 connected to a hydraulic cylinder 14 or a motor. When moving in parallel from right to left in Figure 4, each cooling plate 3 is moved by the moving arm 13 and rotated in the direction of the arrow, thereby crushing the slag solidified on the cooling plate 3. A device may also be provided.
Next, an example of a fluid supply path for water or the like serving as a heat medium in the melting sensible heat recovery apparatus to which the present invention is applied is as shown in FIG. That is, the fluid is first temporarily stored in the drum 21 from the supply source and then passed through the pump 22 to the heat exchanger 4 according to the present invention.
and is supplied to the cooling plate 3 in series or in parallel. The fluid that has undergone heat recovery is collected again in the drum 21, and is supplied to the target equipment as required as steam or a gas-liquid mixture of steam and hot water. Therefore, at the beginning of operation, fluid at room temperature enters the heat recovery device according to the present invention, but when the operation continues, steam or hot water after heat recovery is collected in the drum 21, so that the temperature of the fluid in the drum increases. becomes higher than normal temperature. Since the hot water in this drum is further circulated as supply water to the next heat recovery operation through the pump 22, most of the fluid after heat recovery is vaporized and enters the drum 21 one after another.
As mentioned above, steam or hot water is supplied to the user as needed. Therefore, the normal temperature V supply water serves as make-up water for keeping the liquid level in the drum 21 constant. The above is an example of the operation of a fluid-based heat recovery device to which the present invention is applied, and it is obvious that there are various methods other than those shown in Figure 6 as specific methods for recovering hot water or steam. That's right.

Figure 7 shows water A at a temperature of approximately 30 oo from the water supply drum.
This is a graph showing the change in temperature after heat recovery, and the temperature of the flowing water recovered as steam or hot water B is 100o
~150°C, and the temperature peak of this gas-liquid mixture is the highest temperature when the key heat is recovered by a laminar flow of new melt.

The melt-temperature sensible heat recovery device to which the present invention is applied, flows a single-layered thin flow over a cooling plate, and a heat recovery device is installed on the top to recover heat from the melt. By letting the heat flow through the cooling plate, the conductive heat of the weld can be effectively recovered.
In addition, a solidified birch crushing device is installed to crush and efficiently remove the slag solidified on the cooling plate, making it easier to start the next heat recovery operation and increasing the work efficiency of the heat recovery operation. There are also side effects.

As described above, according to the present invention, it is possible to efficiently recover ocean heat from blast furnace mugwort, etc., which was almost unrecovered in the past, and when pure water is used as a heat medium, hot water can be used depending on the purpose of use. Or it can be recovered as vapor.

If it is recovered as steam, it can be integrated into the on-site steam system, which has the effect of significantly reducing the amount of fuel used in the boiler and significantly contributing to energy conservation and environmental measures.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of a port-controlled sensible heat recovery device using laminar flow to which the present invention is applied, and Fig. 2 is a cross-sectional view showing an embodiment of the heat exchanger used in the present invention next to the pocket machine. 3 is a sectional view showing a cooling plate used in the embodiment shown in FIG. 1, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG.
An enlarged view of part A in the figure, FIG. 6 is a system diagram showing an embodiment of the fluid circulation path of the heat medium in the present invention, and FIG. 7 is a diagram showing the fluid supply temperature and gas-liquid during heat recovery when the present invention is implemented. It is a graph which shows an example of the fluctuation course of mixture temperature. 1... Melting principle, 3... Cooling plate, 4...
・Heat exchanger, 5, 16...Pipe, 6...
Reflector, 11... High pressure water nozzle, 12...
・・Cooling plate rotation axis, 13 ・・・・・・Frustration arm, 14
...Hydraulic cylinder, 15... Rod. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure T

Claims (1)

[Claims] 1. A cooling plate with a built-in heat medium supply pipe is provided to be inclined from the supply side of the molten slag to the discharge side, and a heat exchanger consisting of a heat medium supply pipe and a reflection plate is installed above the cooling plate for cooling the molten slag. The molten slag is poured onto the inclined cooling plate to form a thin layer, and the thin layer is cooled and solidified to be crushed and removed in lumps, and then the molten slag is poured onto the cooling plate again. A method for recovering sensible heat from molten slag using a thin laminar flow, characterized in that the process of forming a thin layer by repeatedly performing the process of flowing molten slag to collect sensible heat from the molten slag.