JPS6054593B2 - Heat recovery device for high temperature objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat recovery device for the heat retained in a high-temperature object, in particular, a high-temperature object is crushed in a hardwood furnace to produce a crushed product of a desired particle size, and gas is sucked from the top and bottom of the furnace. This invention relates to a heat recovery device for high-temperature objects that exchanges heat with crushed materials, guides the crushed materials out of the furnace through a suction port provided on the side wall of the upper layer of the furnace, and further exchanges heat with the crushed materials.

In the present invention, a high-temperature object is a substance obtained in a high-temperature molten state and left to cool to solidify at least the surface, and when crushed, it can be made into a product or waste with a desired particle size. .

Specific examples include metals, ferroalloys,
Examples include calcium carbide (carbide) and by-product slag. Taking carbide as an example, carbide is manufactured by putting lime and carbon into an electric furnace, causing them to react, and then taking the molten material out of the furnace and leaving it to cool in a ladle for a long time to solidify. However, the huge amount of heat retained during cooling is completely unused and left unused. In recent years, attempts have been made to recover and effectively utilize the retained heat from the standpoint of energy conservation, but an effective method for recovering retained heat has not yet been established.

For example, a method to recover the heat retained in carbide during cooling (
Japanese Utility Model Publication No. 40-20864) and a method of vaporizing water in a tank using radiant heat (Special Publication No. 49-2983), but both are aimed at recovering heat from the surface of an object and produce high-temperature gas cannot be obtained, it takes a long time to recover the gas, and it is impossible to recover the internal heat in a short period of time.

Another method is to heat-exchange the slag generated from a hot metal furnace by putting it in a hot air furnace equipped with a tube with a heat sink around it (Jikko Sho 3).
2-14204), but this also utilizes radiant heat, does not bring the air into direct contact with the slag, and does not sufficiently recover the heat retained in the slag.

In addition, a method of attaching a dust collection and heat exchange device to the heating furnace and exchanging heat while removing dust from the exhaust gas
However, it is not a method for continuously and efficiently recovering the heat retained in a high-temperature object, nor is it capable of making the high-temperature object a desired particle size.

The present invention was achieved as a result of various researches into recovering the retained heat from a high-temperature object and pulverizing the high-temperature object to a desired particle size.

The present invention provides an apparatus for continuously supplying a high-temperature object from the top of a vertical furnace, discharging the object from the bottom of the furnace, and sucking gas from the top and bottom of the furnace to exchange heat with the high-temperature object. A crusher is installed between the middle part of the refractory-lined vertical furnace or from the middle part to the upper part, and the suction port provided on the upper side wall from the crusher's position is connected to a heat exchanger and a suction device in order. The present invention is a heat recovery device for high-temperature objects, which is characterized in that, on the other hand, crushed materials of a desired particle size are discharged from the bottom of the furnace.

The present invention will be further explained in detail below.

In the present invention, a molten material with at least the surface solidified is continuously charged from the top of a vertical furnace, and the high-temperature object is crushed by a crusher in the middle part of the furnace or between the upper part of the middle part and the crushed material. The suction device exchanges heat with the gas sucked from the top and bottom of the furnace, and the suction device installed after the dust remover and heat exchanger sucks the high-temperature gas from the high-temperature area of the furnace. is introduced into a heat exchanger via a dust remover, while crushed materials are discharged from the bottom of the furnace.

The vertical furnace according to the present invention has an inner wall lined with a refractory, and includes a furnace top, an upper layer,
It consists of a middle part, a lower part, and a bottom part.

The top of the furnace is a hopper that receives a large mass of high-temperature objects.
Furthermore, a crusher is installed between the middle layer or the upper layer of the furnace, and the crusher crushes large chunks of high-temperature objects that fall from the top of the furnace, and the crushed materials are continuously extracted from the bottom of the furnace. It is then taken out and further transported by a conveyor. The crusher may be any type that can crush the high-temperature object into a shape with a desired particle size, and includes, for example, a breaker-type crusher, a jaw crusher, a roll crusher, and the like.

These medium breaker types are preferable because they can crush objects in the middle of the furnace even when the furnace is filled with high-temperature objects.

Further, if a crusher such as a jaw crusher or a roll crusher is installed in the upper part of the furnace and the crushed materials are deposited in the furnace, the desired particle size can be obtained. The reason for crushing in a furnace in the present invention is that the surface area is increased in order to effectively exchange the heat held by the high-temperature object, and as a result, products with the desired particle size and waste that are easy to process can be obtained.

The suction port for the high temperature gas is provided at a position slightly above the crusher or above the pile surface of the crushed high temperature objects.
In addition, as shown in the drawing, the suction port is connected to a dust remover and a primary heat exchanger, and then via a secondary heat exchanger to a suction device (
For example, the heat exchanger is connected to a blower) to forcibly draw high-temperature gas and exchange heat with the heat exchanger, but depending on the case, the secondary heat exchanger may not be necessary. Examples of the gas used in the present invention include air, nitrogen, and carbon monoxide, but these are determined depending on the type of high-temperature object being handled. For carbide, nitrogen gas is preferred to prevent weathering, but usually air It is practical because it is inexpensive and does not require special equipment. In the present invention, gas is sucked from the top and bottom of the furnace, surface heat exchange of high-temperature objects is carried out between the top of the furnace and the upper or middle part of the furnace, and crushed materials are exchanged between the bottom and the middle part of the furnace. It is possible to perform heat exchange and sufficiently recover the heat held by the high-temperature object. Furthermore, in the present invention, the heat exchange is performed by efficiently recovering the heat retained in the high-temperature object by using at least one or more heat exchangers installed between the suction port and the suction device to collect the high-temperature gas obtained by heat exchange in the vertical furnace. can do.

Furthermore, if the gas discharged from the suction device or the separately preheated gas is supplied from the top and bottom of the vertical furnace, thermal efficiency can be further improved.

The heat recovery device for high-temperature objects of the present invention has a temperature of 200 to 3
000'C, which is completely solidified or has molten material left inside.If the molten material is directly used as raw material in a vertical furnace, it will be difficult to handle. Not practical.

Examples will be further described below with reference to the drawings.

The inner wall of the vertical furnace 1 shown in FIG. 1 is made of a lining material that is refractory even when it comes into contact with a high-temperature object of 2000° C. or higher. A crusher 2 is provided in the middle part of the furnace body, and a high-temperature gas suction port 3 is provided on the side wall above the crusher 2.

Suction devices of a primary heat exchanger 4 and a secondary heat exchanger 5 are connected to this suction port 3 . Crusher 2 is 4-7kg/C7l
A breaker using f compressed air (which hits the rod to break it) is provided.

The primary heat exchanger separates dust in the high-temperature gas and exchanges heat with the main body jacket, and the high-temperature gas is sent to the secondary heat exchanger.

A secondary heat exchanger is a device that exchanges heat with a medium for the purpose of heat utilization, but when water is used as a medium in a tube-type condenser, heat is exchanged with high-temperature gas and hot water or steam is obtained. When this hot water or steam is introduced into the jacket of the primary heat exchanger, even higher temperatures are obtained. Each device is connected using a large diameter vibrator, but it would be more efficient to cover it with a heat insulating material such as glass fiber to reduce heat loss.

Temperature 200-3000℃ continuously introduced from the top of the furnace
High-temperature objects can be crushed in a short time by a crusher from 50 to 50,077!77
! It is crushed into small pieces of φ.

The crushed material of high-temperature objects accumulates in the lower part of the furnace and flows from the bottom of the furnace at a rate of 0.5 to 150 tons per hour. It is continuously extracted at a speed of 0n and carried out on a heat-resistant conveyor under the frame.

The removal speed of the crushed material is set to approximately match the input amount, and adjusted so that the high-temperature material is retained in a fixed amount below the middle layer.

Air as a heat medium is sucked in from the top and bottom of the heat recovery furnace. The air from the top absorbs the heat from the surface of the hot object, and the air from the bottom preheats the crushed material while cooling it. The temperature inside the furnace is the highest, and the air is forcibly drawn in by a blower.

The temperature of the high-temperature gas to be sucked is 200 to 1000°C, and the amount of suction is 500 to 10,00 N per hour. The temperature of recovery can be adjusted over a wide range by changing the amount of exchanged air and the amount of water or medium in the heat exchanger depending on the intended use of the recovered heat. In the heat recovery device of the present invention, the primary heat exchanger recovers 5 to 50% of the heat, the secondary heat exchanger recovers 15 to 40%, and the total amount of heat exchanged between the primary and secondary heat exchanges is 20 to 50% of the total heat input. 90% can be recovered. As described above, in order to recover the maximum internal heat of a high-temperature object in a short period of time, the present invention crushes the high-temperature object in a heat recovery furnace and exchanges heat using gas as a medium, thereby converting it into a product or converting it into waste. This has the advantage that the processing steps of can be omitted.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG.
A sectional view of the recovery device, and FIG. 2 is a plan view thereof. Code, 1......Right furnace, 2......Crushing machine,
3... Suction port, 4... Primary heat exchanger,
5... Secondary heat exchanger, 6... Blower.

Claims (1)

[Claims] 1 In a device that continuously supplies a high-temperature object from the top of a vertical furnace, discharges the object from the bottom of the furnace, and sucks gas from the top and bottom of the furnace to exchange heat with the high-temperature object, the inner wall of which is lined with a refractory lining. A crusher is installed between the middle part of the vertical furnace or from the middle part to the upper part, and a suction port provided on the upper side wall from the crusher position is connected to a heat exchanger and a suction device in order, On the other hand, a heat recovery device for high-temperature objects is characterized in that crushed materials of a desired particle size are discharged from the bottom of the furnace.