KR20090111476A - Circulative type sintering facilities for manufacturing light weight aggregate - Google Patents

Abstract

PURPOSE: A circulative type sintering facility for manufacturing the light aggregate is provided to reduce the fuel cost by utilizing the residual carbon power of the waste coal as the fuel. CONSTITUTION: A circulative type sintering facility for manufacturing the light aggregate comprises a buggy(4), a sintering furnace(8), a heating means, and a heat transfer means. Trays(2) for receiving the original material of light aggregate are installed on the balance one by one. The sintering furnace comprises a door(10) through which the buggy passes and unit rooms for receiving plural buggies. The heating means selectively supplies the heat to some of the unit rooms or the whole.

Description

Circulative type sintering facilities for manufacturing light weight aggregate}

The present invention relates to a sintering furnace, and more particularly to a circulating sintering equipment for producing light aggregates using waste coal.

Light weight aggregate refers to a lighter weight than ordinary aggregates among concrete or mortar aggregates as building materials, and includes natural light aggregates and artificial light aggregates. Artificial lightweight aggregate is sintered clay and shale at high temperature, and is expanded clay to expandable shale homogeneously expanded and foamed when sintered.

Concrete using lightweight aggregate is 20 ~ 30% lighter in weight than ordinary concrete and is rich in heat insulation and sound insulation. There are many advantages such as increase, which contributes to the efficiency of architecture in many ways.

Conventionally, rotary kilns (rotary kiln) have been provided as a means for artificially manufacturing lightweight aggregates and are still used. Rotary kiln is a large facility that sinters and cools during the forced transfer of raw materials by using a feed screw, which contributed to mass production of lightweight aggregate. However, it was difficult to control the process and partial fusion occurred between the hot and heated aggregates. In addition, a large amount of dust was generated during operation of the facility, and it was necessary to equip the facility to deal with it in accordance with environmental standards. In addition to the high initial installation cost, there is a fatal disadvantage that the fuel cost is excessively consumed in use. Bunker oil is usually used as a fuel, and enormous costs are required to deal with air pollutants generated by burning it.

These various problems inevitably caused the cost increase of lightweight aggregate, including environmental pollution and noise.

On the other hand, methods of producing construction materials such as light aggregates and bricks using industrial wastes such as coal waste and fly-ash have been provided. It is clear that these waste materials have a large amount of discharge and are difficult to dispose, and if recycling technology for them is supplied, it will greatly contribute to the environment as well as the supply and demand of raw materials.

Known technologies related to this include Korean Patent Application Nos. 10-1978-0002023, 10-2007-0037242, 10-2006-0038534, and the like. Each one of them accomplishes his desired purpose.

An object of the present invention for the above problems is to provide a kiln, that is, a sintering furnace that can solve the problems of the conventional rotary kiln and replace them. That is, to provide a sintering furnace with low fuel consumption, low environmental hazards and low noise. In particular, it is an object of the present invention to provide a sintering furnace for the production of lightweight aggregate having a new structure more beneficial to the environment by using industrial waste materials and a sintering facility using the same.

The above purpose, the tray that can hold the raw material of the light aggregate aggregate bogie can be installed; Comprised of a plurality of unit rooms having an entrance door through which the trolley can pass and provide a closed space for accommodating a plurality of the trolleys, polygonal on the ground so that the unit room shares a partition with a neighboring unit room A sintering furnace formed by being arranged in a circular shape; Heating means for heating and sintering the lightweight aggregate raw material loaded on the balance by selectively supplying heat to part or all of the unit room;

It is achieved by a circulating sintering facility for manufacturing light aggregates, characterized in that it comprises a heat transfer means for selectively transferring the heat filling one unit room to the neighboring unit room.

According to a feature of the invention, the heat transfer means is a gate installed in the form of a window in the partition wall installed between the unit room; Heat-resistant plate which is installed to be able to move up and down to selectively open and close the gate; An opening / closing motor for driving the heat-resistant plate; A blower duct, one end of which is installed to pass into the unit room; And a blower installed at the other end of the blower duct so as to blow the air into the unit room.

According to a feature of the present invention, the light aggregate may be used as a raw material containing 50 to 90% by weight of waste coal having a fixed carbon content of 5 to 10% by weight.

According to the above configuration, the fuel cost can be extremely reduced by utilizing the remaining carbon content of the waste coal as fuel, and since the raw material of lightweight aggregate does not flow during sintering, it maintains the initial molded form and requires a separate crushing process after sintering. It is not necessary to provide a dust treatment facility with less dust generation, and there is no operation of mechanical equipment, and a circulating sintering facility for manufacturing lightweight aggregates with little operational noise is provided.

On the other hand, it is possible to actively use the waste coal containing a small amount of fixed carbon that can not be used as a fuel is provided a lightweight aggregate manufacturing equipment that can contribute to resource recycling.

Hereinafter, with reference to the accompanying drawings in the detailed description of the present invention will be described in more detail. 1 is a perspective view of a sintering facility for producing lightweight aggregate according to an embodiment of the present invention, Figure 2 is a perspective view without a loop portion, Figure 3 is a schematic plan view. Figure 4 is a partial cross-sectional view of the sintering furnace of the sintering facility for manufacturing lightweight aggregates according to an embodiment of the present invention. 5 is a cross-sectional configuration diagram of a side wall illustrating an opening and closing method or configuration of the side wall opening and closing door. Figure 6 is a perspective view of a sintering facility for manufacturing lightweight aggregates according to another embodiment of the present invention.

The sintering equipment for manufacturing lightweight aggregate of the present invention is a trolley 4 on which the tray 2 can be placed, a unit room 6 that can accommodate a large number of trolleys 4, and a plurality of unit rooms of about 10 to 30 units. Sintering furnace (8) consisting of (6), heating means for igniting the raw material (M) of the light aggregate and heat transfer means for transferring heat from one unit room (6) to the neighboring unit room (6) Include.

Sintering equipment for producing light aggregates according to the present invention (hereinafter referred to as sintering equipment) has a scale equivalent to a single-story building as shown in FIG. The present inventors anticipate that the circumferential length of the sintering equipment is about 500 to 70 m and the height is 2 to 3 m. The planar shape of the unit room 6 is shaped like a trapezoid as shown in FIG. 3.

One trolley 4 may be provided with a layer 2 to 10 to 20 trays 2 that can contain the raw material of the light aggregate. As will be described later, since the temperature of the unit room 6 reaches 1200 ° C or more, it may not be suitable for installing wheels on the trolley 4. In this case, it is possible to mount the trolley 4 in the unit room 6 using a lift means such as a conventional forklift.

All the device components installed in the unit room 6 should be made of fire and heat resistant materials that can withstand high temperatures. The layered structure of the tray 2 on the trolley 4 is similar to the structure of an oven for baking bread, and a person skilled in the art will be able to sufficiently configure it.

One tray 2 may be accommodated in a state in which 50 to 100 l of the lightweight aggregate raw material is widely spread. The tray 2 preferably has a mesh or a plurality of vents so that heat is easily communicated in the up and down direction of the trolley 4 and the raw materials are easily burned or sintered.

According to the present invention, the lightweight aggregate raw material (M, hereinafter referred to as 'raw material') is based on the fact that it may include waste coal. Waste coal is not suitable for use as fuel because it contains only about 5 to 10% by weight of the total weight, unlike anthracite (85 to 95% of fixed carbon) used as a fuel. This invention makes it possible to utilize this waste coal as a fuel. Since the content of the fixed carbon content of the waste coal mentioned above is merely an example, a slight difference in the amount does not limit the scope of the present invention.

It is the best embodiment of the present invention to include waste coal in the raw materials. That is, waste coal may not be essential to the present invention. If the material can be ignited by a certain amount of heat supply, it can replace waste coal even if it is more expensive.

Raw materials are prepared and supplied as follows. That is, uniformly mix 80 to 90% by weight of the original waste coal (existed in the form of waste ore), 5 to 10% by weight of clay, 2 to 5% by weight of adhesive, and 2 to 3% by weight of solvent. Diameter 5 ~ 30mm). The molding method is a well-known matter. Usually, it is molded by kneading with water and putting it into a molding machine. The specification of raw materials can be provided in various ways depending on the intended use.

The unit room 6 has an entrance door 10 through which the trolley 4 can pass and provides a closed space for accommodating 5 to 20 trolleys 4. The unit room 6 has a volume comparable to one room in a residential building. The door 10 may be opened or closed using a power source, regardless of a sliding type or a sliding type.

Each unit room 6 is arranged in the form of a polygon, oval or circle on the ground so as to share a partition with a neighboring unit room 6. The unit room 6 only needs to be arranged in the form of a closed curve so as to have a circulating structure. As shown in Figure 1, but is arranged in a circular (to annular), but is not limited to this may be arranged in a polygonal shape as shown in FIG. In particular, in order to increase the volume ratio of the unit room 6, that is, to exclude the corner portion, it will be desirable to provide a central space (S) in the center. The sintering furnace 8 having the central space S is formed by the plurality of unit rooms 6.

All parts contacting the interior space of the unit room 6 including the door 10 should be made of fire resistant or heat resistant material. The side walls 7a, the partition walls 16, the bottom walls 7b, and the roof walls 7c constituting the unit room 6 may be used where materials such as refractory brick, refractory concrete, or ceramics are selectively needed. Known structures and materials that can withstand high temperatures may be employed in the installation of the present invention, and thus further description thereof will be omitted.

By selectively supplying heat to all or part of the unit room 6, a heating means for heating and sintering the raw material M loaded on the trolley 4 is provided.

The heating means will typically be a burner 12. The burner 12 may be installed in the central space S provided in the middle of the sintering furnace 8 (see FIG. 3). The installation position of the burner 12 may be variously modified as necessary. The burners 12 may be installed in one or more numbers as necessary.

The burner 12 is a specific unit room (hereinafter referred to as 'the first unit room 6a') is a temperature at which the raw material (M) placed on the balance can be naturally ignited by raising the room temperature to 400 to 600 ° C. Create an environment. The raw material (M) is then burned with a calorie value corresponding to the calorie content of the raw material itself. According to the test of the inventors, once complexed raw materials start to be burned in a chain, even if the hot air supply by the burner is stopped or the hot air supply amount is minimized, the temperature of the first unit room 6a is increased to 1150 to 1250 ° C. It was confirmed that the temperature can be increased. This temperature corresponds to the temperature at which the raw material M is sintered. When the sintering temperature is maintained for a certain time, all the raw materials M in the first unit room 6a are completely sintered. The flame of the burner 12 is configured to supply hot air to the first unit room 6a through the hot air supply port 14 provided on the side wall (see FIGS. 2 to 3).

The present invention includes heat transfer means for allowing the heat filling the first unit room 6a to be transferred to the neighboring second unit room 6b. The most convenient method is to open some or all of the partition walls 16 between the first unit room 6a and the second unit room 6b so as to communicate with each other. The structure for opening the partition 16 is demonstrated with reference to FIG. Gates 18 are provided in the partition wall 16 provided between the unit rooms 6 in the form of a lattice like a window. The heat-resistant plate 20 for selectively opening or closing the gate 18 is provided to be able to move up and down through the space in the middle of the partition wall. The heat resistant plate 20 is also made of a fire resistant material. The heat-resistant plate 20 is connected to the driving means such as the opening and closing motor 22 installed on the roof wall 7c of the unit room by a wire 24 to open or close the gate 18 by the rotation of the opening and closing motor 22. It can be closed. Each unit room 6 can all be spatially communicated with the neighboring unit room 6 in this form. Of course, a hydraulic cylinder may be used in place of the open / close motor 22.

Blowing means may be provided to assist in heat transfer by selective opening of the gate 18. This will be described with reference to FIG. 4. 4 is a cross-sectional configuration diagram in the form of a developed view for explaining the heat transfer process. The hot heat that fills the first unit room 6a naturally moves through the open gate 18 to the second unit room 6a. This is due to the principle of heat transfer called thermal equilibrium.

The blowing means for quickly transferring heat to the second unit room 6a may include a blowing duct 25 installed on each roof wall of the unit room and a connection duct 27 in addition thereto. Hereinafter, the relationship between each other is selected by selecting the 1st, 2nd unit rooms 6a and 6b among several unit rooms 6.

The first blower duct 26 is provided on the roof wall 7c so that the blower hole 26a of the first unit room 6a passes through the inside of the first unit room 6a, and the first blower duct 26 And a blower 28 (see FIG. 1) provided on the opposite side of the blower 26a. In order to prevent heat loss of the first unit room 6a, the blower 28 may be configured to supply hot air. Then, the pressure in the first unit room 6a is increased and this pressure is distributed to the second unit room 6b through the gate 18. In this process, heat is transferred to the second unit room 6b more quickly.

In addition to the first air duct 26, the first connection duct 30 may be connected between the first and second unit rooms 6a and 6b. This is to allow the air pressure supplied from the first blowing duct 26 to be transmitted to the neighboring second unit room 6b through the first connecting duct 30. This is an auxiliary means to make heat transfer more quickly. The flow path opening and closing valve 32 is provided in each of the first blowing duct 26 and the first connecting duct 30. The flow path opening and closing valve 32 is for preventing heat loss and controlling the heat transfer path. Where to open and close the flow path opening and closing valve 32 is in accordance with the common sense, so a detailed description thereof will be omitted.

The environment of the first unit room 26, which is about 1200 ° C., is transferred to the second unit room 6b through the gate 18 through the first connection duct 30, whereby the second unit room 6b is transferred. When the ignition temperature of the raw materials is reached, the raw materials in the second unit room 6b are ignited and combusted. In this process, hot air may be supplied by a separate burner (not shown) in order to supply heat more quickly. According to this configuration, heat and air pressure are transmitted along the direction indicated by the arrow. The first unit room 6a enters the cooling stage.

After all of the raw materials in the second unit room 6b are sintered, the heat in the second unit room 6b is transferred to the third unit room 6c in the same manner. The heat transfer method is the same as heat transfer from the first unit room 6a to the second unit room 6b. That is, for this purpose, the second blowing duct 34 and the second connecting duct 36 are installed between the second unit room 6b and the third unit room 6c.

In this manner, the raw materials in all the unit rooms 6 below the third unit room 6c can be sintered serially. According to the present invention, the structure of the sintering furnace 8 can be provided to minimize the heat transfer path to prevent heat loss as much as possible and to further increase the thermal efficiency by recycling the heat transferred through the partition wall 16.

The sintered raw material is subjected to a cooling step to form a rigid, rigid coating layer. Sudden cooling results from slow cooling as it damages the light aggregate. Finished lightweight lightweight aggregate is to be withdrawn after opening the door (10, Fig. 1 or 2) of the unit room.

According to the embodiment of the present invention, the sintering furnace 8 may be composed of 10 to 30 unit rooms 6. As shown, the unit room 6 consists of 12 pieces. At one point during operation, each unit room 6 may be divided into a preheating group, a sintering group, and a cooling group, and the ratio may be 5: 4: 3. By preheating before sintering, it is possible to easily create a sintering environment (see Fig. 3). The preheating means may be a burner or a heater, not shown, and may be supplied with heat through the blowing duct 25 or the connecting duct 27 from the specific unit room 6 being cooled after sintering.

Pressure control means can be provided to eliminate the problems caused by pressure imbalance between the unit room 6 and the neighboring unit room (6) in the sintering process. This is possible by allowing the unit rooms 6, which are distinguished by the partition walls 16, to communicate with each other through the space between the bottom walls 7b. That is, the space between the bricks 38 constituting the bottom wall 7b is installed by 1 to 5 cm. This interval becomes the pressure regulation passage 40 to allow for communication of air (see FIG. 3).

The blowers 28 may be installed in each unit room 6, but may be configured to be blown to the required unit room 6 while rotating in accordance with the progress of sintering with one or two blowers. All these operating conditions can be clearly determined by a few experiments.

Each detailed device element mentioned can be changed freely by those skilled in the art in the installation position and control method. That is, the illustrated configuration is only one example for implementing the present invention.

The present invention has the greatest advantage in providing a sintering furnace of a useful structure that can be substituted for the conventional rotary kiln, and in addition, it is possible to select a suitable raw material, that is, waste coal, which is extremely advantageous and economical to the environment. There are other advantages to providing a.

1 is a perspective view of a sintering facility for producing lightweight aggregates according to an embodiment of the present invention, Figure 2 is a perspective view in a state without a loop portion.

Figure 3 is a schematic plan view of the sintering furnace of the sintering equipment for manufacturing lightweight aggregate according to an embodiment of the present invention.

Figure 4 is a cross-sectional configuration of the development of the sintering furnace form of a sintering facility for manufacturing lightweight aggregates according to an embodiment of the present invention.

5 is a cross-sectional view of the side wall illustrating an opening and closing method or configuration of the side wall opening and closing door.

Figure 6 is a perspective view of a sintering facility for manufacturing lightweight aggregates according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2 ; Tray 4; Balance

6; Unit room 8; Sintering furnace

10; Entry door 12; burner

14; Hot air supply port 16; septum

18; Gate 20; Heat-resistant plate

22; Switching motor 25; Blowing duct

27; Connecting duct 32; Flow opening and closing valve

38; Brick 40 (of the bottom wall); Pressure regulating passage

S; Central space M; Lightweight Aggregate Raw Materials

Claims (4)

A tray (2) that can contain the raw material (M) of the lightweight aggregate, the trolley (4), in which a layer layer can be installed; Comprised of a plurality of unit rooms (6) provided with a door (10) through which the trolley (4) can pass, providing a closed space for accommodating a plurality of the trolley (4), the unit room (6) A sintering furnace 8 formed by arranging polygons or circles on the ground so that)) share a partition 16 with a neighboring unit room 6; Heating means for heating and sintering the lightweight aggregate raw material (M) loaded on the trolley (4) by selectively supplying heat to a part or all of the unit room (6); Heat transfer means for allowing heat to fill one unit room 6 to be transferred to a neighboring unit room 6; It is achieved by a circulating sintering equipment for producing lightweight aggregate, characterized in that it comprises a. The heat transfer means according to claim 1, further comprising: a gate (18) installed in the form of a window in the partition wall (16) provided between the unit rooms (6); A heat-resistant plate 20 installed to be able to move up and down to selectively open and close the gate 18; Circular sintering equipment for manufacturing lightweight aggregate, characterized in that it comprises a driving means such as opening and closing motor 22 as to drive the heat-resistant plate 20. According to claim 1, wherein the pressure control passage (40) between the adjacent unit room (6) by installing a brick 38 constituting the bottom wall (7b) of the unit room 6 with a space of 1 ~ 5cm Circular sintering equipment for producing lightweight aggregate, characterized in that provided. The heat transfer means according to claim 1, further comprising: a gate (18) installed in the form of a window in the partition wall (16) provided between the unit rooms (6); A heat-resistant plate 20 installed to be able to move up and down to selectively open and close the gate 18; Opening and closing motor 22 for driving the heat-resistant plate 20; A ventilation duct 26 having one end installed in the unit room 6; And a blower (28) installed at the other end of the blower duct (26) so as to blow the air into the unit room (6).

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