JP2001355009A - Heat exchanger for slag particles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a dust collecting treatment unnecessary by performing a heat exchanging treatment of slag particles without bringing a heat exchanging medium into direct contact with the slag particles. SOLUTION: This heat exchanger is provided with a square shell 10 having a flowing-inlet 10a to which the high temperature slag particles S flow in, an outlet 10b discharging the flowing-down slag particles S fed from the flowing- inlet 10a, a contacting body disposed in the angular shell 10 contactable with the slag particles S and a heat collector having a heat conductive pipe inserted in the inner part of the contacting body and in which the heat exchanging medium flows. Heat exchange can be achieved without bringing the heat exchanging medium into direct contact with the slag particles S so that any device for cleaning the heat exchanging medium is unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag particle heat exchanger for recovering heat through a heat exchange medium from slag particles obtained by subjecting a molten slag discharged from a blast furnace or the like to wind milling.

[0002]

2. Description of the Related Art Usually, slag particles are obtained by injecting a fluid such as water or air into molten slag generated from a refining plant or the like. In particular, since the slag particles obtained by injecting gas such as air maintain a high temperature state,
Various types of effective heat exchange devices for recovering the heat have been conventionally considered. For example, as this type of heat exchange apparatus, there is an apparatus described in JP-A-11-181508. As shown in FIG.
A slag particle generator 1 that generates slag particles, a belt conveyor 2 that conveys the generated slag particles S, a shell 3 in which the slag particles S conveyed by the belt conveyor 2 are put, and a heat that is blown into the shell 3 to recover heat. The slag particle generator 1 includes a delivery path 4 for delivering gas serving as an exchange medium, and a dust collector 5 for cleaning gas in the middle of the delivery path 4.
The heat exchange is performed between the slag particles S supplied from the blast furnace and the blown gas, and the gas heated by the heat exchange is supplied to a boiler (not shown) provided on the downstream side of the dust collector 5. The boiler generates steam by the calorific value of the supplied gas and rotates a turbine (not shown) to generate power.

[0003]

By the way, in this conventional heat exchanger, the heat exchange medium is brought into direct contact with the slag particles S. If it becomes dirty due to, for example, the contamination becomes severe, dust adheres to the delivery path 4, contaminates the path, and adversely affects the operating environment. In order to suppress the adverse effect, in the conventional heat exchange device, a dust collector 5 is provided in the gas delivery path 4 to remove dust and the like accompanying the gas. However, even if the dust collector 5 is used, the following problems occur. Since it is impossible to remove 100% of dust and the like accompanying the gas, the gas still pollutes the path and adversely affects the operating environment. If dust accumulates in the dust collector 5, a load will be generated in gas delivery. Since the dust collector 5 is a consumable item, it is necessary to periodically perform processing such as cleaning and replacing the filter, and the maintenance of the heat exchanger becomes complicated.

[0004] The present invention has been made in view of such a problem, and enables the heat exchange treatment of slag particles without directly contacting a heat exchange medium with the slag particles, thereby eliminating the need for dust collection processing. It is an object of the present invention to provide a heat exchange device for slag particles.

[0005]

The technical means of the present invention for solving such a problem is a heat exchange device for slag particles for recovering heat from high-temperature slag particles in which molten slag is formed into granules. A shell having an inflow port through which the slag particles flow in and an outflow port through which the slag particles flowing down from the inflow port are discharged, and disposed in the shell so as to be able to contact the slag particles; And a heat collector having a heat conducting pipe inserted through the contact body and through which a heat exchange medium flows. The heat exchange medium receives the heat from the slag particles in the heat transfer pipe, turns it into steam, is sent out, and circulates back to the heat transfer pipe after being used for power storage. The slag particles and the heat exchange medium
Perform heat exchange without direct contact. Therefore, the heat exchange medium is not contaminated by dust or the like attached to the slag particles, and the operating environment is not adversely affected by the contamination of the heat exchange medium, so that the apparatus environment of the apparatus can be maintained for a long time.
In addition, since a dust collector for cleaning the heat exchange medium is not required, there is no need to clean the dust collector or replace the filter, thereby facilitating the maintenance of the apparatus. If necessary, a space through which the heat conducting pipe is inserted is formed in the contact body of the heat collector, and the space is filled with a metal that can be melted by the heat of the slag particles. When the slag particles flow into the shell, the metal filling the contact body melts due to the heat of the slag particles flowing in, and the amount of heat of the molten metal is exchanged through a heat conducting pipe that contacts the metal. Transmitted to the medium. Since the liquefied metal moves convectively in the contact body and makes the temperature inside the contact body substantially constant, the amount of heat per hour transferred to the heat conducting pipe becomes substantially constant. Accordingly, the amount of heat transmitted to the heat exchange medium is also substantially constant, and the heat exchange efficiency is substantially constant and a stable amount of heat is supplied, so that the heat exchange efficiency can be given a constancy.

Further, if necessary, a discharge adjusting device for adjusting the discharge amount of the slag particles is provided on the outlet side. When slag particles are deposited on the shell, the outlet is stopped by the discharge adjusting device, and after a predetermined amount is deposited, the outlet is controlled by the discharge adjusting device in consideration of the amount of slag particles flowing in per hour. To adjust the amount of slag particles discharged.
At this time, since the outflow speed of the slag particles in the shell can be adjusted so that the heat of the slag particles discharged from the outlet is effectively exchanged, excellent heat exchange efficiency can be obtained. Further, if necessary, the contact body of the collector is
It was formed in a plate shape and arranged in a plurality of rows. The contact body is formed in a plate shape, and it can be arranged in the shell in a plurality of rows so that slag particles can be inserted between them. Efficiency can be improved. If necessary, the heat collector is provided with a lead-out pipe that leads out the molten metal and can detect the liquid level of the metal. Since the outlet tube, which can visually detect the liquid level of the molten metal, is provided in the heat collector, it can be immediately confirmed from the outside that the metal in the contact body has leaked out of the contact body or into the heat conduction pipe. Furthermore,
If necessary, the shell was provided with a vibrator for vibrating the shell. By applying vibration to the slag particles, stagnation of slag particle discharge is suppressed, and slag particle discharge can be performed smoothly. Furthermore, if necessary, a disperser for dispersing the slag particles flowing into the inlet into the shell and distributing the slag particles into the shell is provided at the inlet of the shell. The slag particles are deposited in the shell such that the deposition surface is horizontal, and the collector can be covered with the slag particles without bias. If the accumulation state of the slag particles is uneven, the area of the heat collector in contact with the slag particles is reduced, and the heat exchange efficiency is reduced. If there is no deviation, heat exchange is performed using the entire area of the heat collector with which the slag particles are in contact, so that the heat exchange efficiency increases.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A slag particle heat exchange apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Note that the same components as described above are denoted by the same reference numerals and described. The slag particle heat exchange device described here performs heat exchange using slag particles obtained by subjecting molten slag discharged from a blast furnace to air-blasting. As shown in FIGS. 1 to 4, a slag particle heat exchange device H includes a shell 10 that performs a heat exchange process on a slag particle S to be subjected to heat exchange, and a heat collector that contacts and exchanges heat with the slag particle S. 11 and shell 10
And a discharge adjusting device 12 for adjusting the discharge amount of the slag particles S flowing into the tank.

The shell 10 has an inflow port 10a on the upper side through which the slag particles S flow through the disperser 13, and an outflow port 10b on the lower side from which the slag particles S flowing in from the inflow port 10a and discharged therefrom are discharged. It consists of a shape of lower withering having a. The disperser 13 is formed of a rectangular tube having a large opening on the side of the belt conveyor 14, performs a pendulum operation, and converts the slag particles S carried to the upper portion of the shell 10 by the belt conveyor 14 into shells 1.
Inflow into the entirety of the inflow port 10a. The inflow port 10a has a shape that covers the tip of the disperser 13 so that the inflowing slag particles S do not leak outside. The outlet 10b has a smaller mouth area than the inlet 10a so that the discharge of the slag particles S that have flowed in is delayed. Also,
Below the shell 10, the slag particles S that have flowed in
There is provided a vibrator 15 that vibrates the shell 10 so as not to be hardened or jammed by being connected in the inside.

As shown in FIGS. 3 and 4, the heat collector 11 includes a contact member 11a disposed in the shell 10 so as to be able to contact the slag particles S, and a heat exchange medium W inserted through the contact member 11a. And a circulating heat conducting pipe 11b.
The collector 11 includes a plurality of plate-like contact bodies 1 that divide the volume of the rectangular parallelepiped portion of the shell 10 in parallel on a vertical plane.
1a are arranged in a row. The contact bodies 11a are arranged at predetermined intervals so that the slag particles S are interposed therebetween. By making this interval very narrow, the number of plate-like bodies can be increased in a predetermined space, so that the surface area of the contact body 11a increases. The contact body 11a has a heat conducting pipe 11
A space U through which b is inserted is formed. After the heat conducting pipe 11b is inserted into the space U, the space M is filled with a metal M that can be melted by the heat of the slag particles S. As the metal M used here, it is preferable to use a conductor having excellent heat conductivity, for example, a low melting point alloy based on lead or the like. Further, at the upper end of the contact body 11a, a lead-out pipe 16 that leads out the molten metal M and that can visually detect the liquid level of the molten metal M is provided at an upper opening. The heat transfer pipe 11b is connected to the inlet I and the outlet O of the heat exchange medium W.
Is provided at the upper end of the contact body 11a.
The book is inserted in a meandering shape in the space of the contact body 11a. The material of the heat conduction pipe 11b may be any material that is hardly corroded by the metal M filling the contact body 11a, has a higher melting point than the metal M, and has excellent thermal conductivity. As the heat exchange medium W flowing in the heat conduction pipe 11b, for example, water is used. The heat transmitted to the heat exchange medium W is recovered by a heat recovery device provided outside, not shown.

The discharge adjusting device 12 appropriately adjusts the discharge amount of the slag particles S by vibrating in an appropriate direction and changing the amplitude. Below the outlet 10b, a belt conveyor 17 that transports the slag particles S that have undergone heat exchange is provided.
In FIG. 2, reference numeral 18 denotes a kiln, and molten slag (for example, 1600 ° C.) from a blast furnace is blown with high-pressure air in the kiln 18 to form slag particles S (for example, 800 ° C.).
(−1000 ° C.) and discharged to the conveyor 17.

Therefore, according to the slag particle heat exchange apparatus H according to this embodiment, the heat exchange processing is performed as follows. First, before the slag particles S flow into the shell 10, the heat transfer pipe 11 b inserted through the heat collector 11 is
Water as the heat exchange medium W flows in and circulates. Next, the molten slag discharged from the blast furnace is pulverized by a kiln 18 to form slag particles S, conveyed by a conveyor 14 and flown into the shell 10 from an inlet 10a. At the time of inflow, the slag particles S are distributed by the disperser 13 to the entire inlet 10a. Therefore, the slag particles S are placed in the shell 1 such that the deposition surface is horizontal.
Since the slag particles S are accumulated in the slag particles S, the heat collector 11 can be covered with the slag particles S without bias. If the accumulation state of the slag particles S is uneven, the area of the heat collector 11 in contact with the slag particles S is reduced, so that the heat exchange efficiency is reduced. However, if there is no unevenness, the heat exchange is performed efficiently. It is. Contact body 1
1a is formed in the shape of a plate, and a plurality of rows are arranged in the shell 10 so that the slag grains S are interposed therebetween, so that the area of the contact body 11a in contact with the slag grains S is smaller than in the case where no slag grains S are provided. Since it becomes large, the heat exchange efficiency can be improved.

The slag particles S flow into the shell 10 by dropping to the outlet 10b by natural fall. At this time, the discharge adjusting device 12 keeps the outlet 10b closed, and deposits the slag particles S in the shell 10 until the slag particles S cover the entire surface of the contact body 11a of the heat collector 11. When the surface of the heat collector 11 is covered with the slag particles S, the discharge adjusting device 12 is operated to adjust the discharge amount of the slag particles S in consideration of the inflow amount per hour of the slag particles S. At this time, if the slag particles S are allowed to stay in the shell 10 so that the temperature of the slag particles S discharged from the outlet 10b becomes the set temperature, excellent heat exchange efficiency can be obtained. In this case, the shell 10 is vibrated by the vibrator 15. Therefore, stagnation of the discharge due to the slag particles S being combined and solidified inside the shell 10 is suppressed, and the slag particles S can be discharged smoothly.

When the slag particles S flow into the shell 10,
The metal M filled inside the contact body 11a is melted by the heat of the slag particles S that have flowed in, and the amount of heat of the melted metal M is transferred to the heat exchange medium W via the heat conduction pipe 11b that contacts the metal. Is transmitted. The liquefied metal M is the contact 1
Since the temperature inside the contact body 11a is made substantially constant by convective movement in the inside 1a, the amount of heat per time transmitted to the heat conducting pipe 11b becomes substantially constant. Therefore, the amount of heat transmitted to the heat exchange medium W is also substantially constant, and the heat exchange efficiency is substantially constant, and a stable supply of heat is realized. Water, which is the heat exchange medium W, receives heat from the slag particles S in the heat conduction pipe 11b, turns it into steam, is sent to the outside, and circulates back to the heat conduction pipe 11b after being used for power storage processing. The slag particles S and the heat exchange medium W perform heat exchange without direct contact,
Since the heat exchange medium W is not contaminated by dust or the like attached to the slag particles S and the operating environment is not adversely affected by the contamination of the heat exchange medium W, the apparatus environment of the apparatus H can be maintained for a long time. In addition, since a dust collector for cleaning the heat exchange medium W is unnecessary, cleaning work of the dust collector and replacement of the filter are not required, and maintenance of the apparatus H is facilitated. Also,
Since the outlet tube 16 capable of visually detecting the liquid level of the molten metal M is provided in the heat collector 11, the metal M in the contact body 11a is provided.
Can be immediately confirmed from the outside to the outside of the contact body 11a or into the heat conducting pipe 11b. The heat exchanged slag particles S are discharged from the outlet 10b to the belt conveyor 17 and transported to a stocking location.

FIG. 5 shows another example of the heat collector 11. The collector 11 has a shape of the contact body 11a and a heat conducting pipe 11b.
Except for the difference in the introduction form, the same operation as that of the above-described heat collector 11 is performed. Since the lower part of the contact body 11a has a comb shape, the contact body 11a is formed so as to have a smaller volume than that of the heat collector 11 described above. The heat conducting pipe 11b is arranged so as to meander in the comb-like portion. Since the surface area of the heat conducting pipe 11b arranged inside the contact body 11a is substantially equal,
The heat efficiency of the entire heat collector is the same as that of the heat collector 11 described above. The difference from the above-described heat collector 11 is that the volume of the contact body 11a is reduced, so that the filling amount of the metal M can be reduced, and the cost required for the metal M can be reduced.

In the slag particle heat exchanging apparatus H according to the above-described embodiment, the space U of the contact body 11a is connected without providing the outlet pipe 16 for each contact body 11a. By providing the lead-out tube 16 to one contact body 11a, leakage of the metal M in the entire contact body 11a can be confirmed by the lead-out tube 16.

[0016]

As described above, according to the heat exchange apparatus for slag particles of the present invention, heat exchange is performed by flowing a heat exchange medium through a heat conducting pipe and indirectly contacting the slag particles. Therefore, the heat exchange medium is not contaminated by the dust of the slag particles, the adverse effect on the operating environment caused by the contamination of the heat exchange medium itself is eliminated, and the apparatus environment of the apparatus itself can be maintained for a long time. In addition, since a dust collector for cleaning the heat exchange medium is not required, maintenance of the heat exchange device is facilitated. In addition, contactor of collector
When a space through which a heat conduction pipe is inserted is formed, and the space is filled with metal that can be melted by the heat of the slag particles, the molten metal convects inside the heat collector and efficiently conducts the heat of the slag particles. Since the heat can be transmitted to the heat exchange medium of the pipe, the heat exchange efficiency can be improved.

Further, when a discharge adjusting device for adjusting the discharge amount of the slag particles is provided on the outlet side, the time for which the slag particles are retained in the shell is adjusted so that the heat of the slag particles is reduced. Can effectively exchange heat. Furthermore, when the contact bodies of the heat collector are formed in a plate shape and arranged in a plurality of rows, the area of the contact body that can contact the slag particles increases, thereby improving the heat exchange efficiency. Can be. Also, if the heat collector is provided with a discharge pipe that can detect the liquid level of the metal by drawing out the molten metal, leakage of the molten metal into the contact body and the heat conduction pipe can be monitored by visually checking the liquid level. Can be easily confirmed. Furthermore, when the shell is provided with a vibrator that vibrates the shell, the slag particles flow down while applying vibration, so that the slag particles are prevented from binding and solidifying, and the clogging of the outlet of the shell is prevented. I do. Furthermore, in the case where a distributor is provided at the inlet of the shell to disperse and flow the slag particles flowing into the inlet into the shell, the entire area of the heat collector with which the slag particles contact is used. Since heat exchange is performed, heat exchange efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat exchange device for slag particles according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a part of a slag particle heat exchange device according to an embodiment of the present invention.

3A and 3B are diagrams illustrating a contact body of a heat collector of the heat exchange device for slag particles according to the embodiment of the present invention, wherein FIG. 3A is a cross-sectional side view of one side, and FIG. It is sectional drawing.

FIGS. 4A and 4B are views showing a state where the heat collectors of the slag particle heat exchange device according to the embodiment of the present invention are arranged in a row, FIG. 4A is a plan view, and FIG. .

5A and 5B are diagrams showing a contact body of another heat collector of the heat exchange device for slag particles according to the embodiment of the present invention, wherein FIG. 5A is a side sectional view and FIG. FIG.

FIG. 6 is a configuration diagram showing a conventional slag particle heat exchange device.

[Explanation of symbols]

 H Heat exchange device for slag particles S Slag particles M Metal W Heat exchange medium U Space 1 Slag particle generator 2 Belt conveyor 3 Shell 4 Delivery path 5 Dust collector 10 Shell 10a Inlet 10b Outlet 11 Collector 11a Contact body 11b Heat conduction pipe 12 Discharge adjusting device 13 Disperser 14 Belt conveyor 15 Vibrator 16 Outlet pipe 17 Belt conveyor

Claims (7)

[Claims] 1. A heat exchange device for slag particles for recovering heat from high-temperature slag particles in which molten slag is formed into granules, wherein the slag particles flow into the upper side and the lower side flow through the inlet. A shell having an outlet through which the slag particles flowing down are discharged; a contact member disposed in the shell so as to be able to contact the slag particles; and a heat conduction pipe inserted through the contact member and through which a heat exchange medium flows. A slag particle heat exchange device, comprising: a heat collector having: 2. The contact body of the heat collector, wherein a space through which the heat conducting pipe is inserted is formed, and the space is filled with a metal that can be melted by the heat of the slag particles. A heat exchange device for the slag granules described. 3. The heat exchange device for slag particles according to claim 1, wherein a discharge adjusting device for adjusting a discharge amount of the slag particles is provided on an outlet side of the shell. 4. The contact body of the heat collector is formed in a plate shape and arranged in a plurality of rows.
Or a heat exchange device for slag particles according to 3. 5. The slag particle according to claim 1, wherein said heat collector is provided with a discharge pipe for discharging molten metal and detecting a liquid level of said metal. Heat exchange equipment. 6. The method according to claim 1, wherein said shell is provided with a vibrator for vibrating said shell.
The heat exchange device for slag particles according to 3, 4, or 5. 7. A disperser for dispersing the slag particles flowing into the inlet into the shell and distributing the slag particles into the shell is provided at the inlet of the shell.
7. The heat exchange device for slag particles according to 4, 5, or 6.