KR20040092859A - perpendicular type calcining furnace - Google Patents

Abstract

PURPOSE: Provided is a vertical calcining furnace, which has an inlet and outlet disposed vertically on the same line to reduce the costs, to facilitate the flow of a charge, and to improve the efficiency and product quality. CONSTITUTION: The vertical calcining furnace comprises an inlet at the top thereof, an outlet at the bottom thereof, and a main body having a rectangular section and performing the calcination of a product. The main body(10) comprises: a first combustion chamber(13a) having a first inclined surface(15), in which the front side of the bottom of the inlet(11) is tilted inwardly, and two burner holes(14a); a second combustion chamber(13b) having a second inclined surface(16), in which the bottom of the first combustion chamber(13a) is tilted inwardly, and two burner holes(14b); a third combustion chamber(13c) having a third inclined surface(17), in which the bottom of the second combustion chamber(13b) is tilted inwardly, and two burner holes(14c), one for each side; a fourth combustion chamber(13d) having a fourth inclined surface(18), in which the bottom of the third combustion chamber(13c) is tilted inwardly, and two burner holes(14d), one for each side; an outlet(12) disposed at the bottom of the fourth combustion chamber(13d) on the same vertical line as the inlet(11); and a collection port(19) having a hole(19a) for collecting combustion air disposed between the outlet(12) and the fourth inclined surface(18).

Description

Vertical type calcining furnace

The present invention relates to a vertical furnace for use in the technical field of producing minerals such as limestone, roadmite, magnesite and the like at high temperature to produce quicklime, magnesia and the like.

In the conventional vertical furnace, as shown in FIG. 1, raw materials such as petrified stone, road mite, and magnesite introduced from an upper inlet in a rectangular type are fired by a thermal power and discharged into a lower outlet.

At this time, the raw material dropped into the firing furnace and dropped by its own weight is moved down along one side wall formed as the inclined surface, and then the raw material is gradually heated by the firepower injected from the side, falling to the other inclined surface on the lower side, and spraying from the side while falling again. Due to the thermal power, the raw material is gradually fired, and the fired raw material is discharged to the lower outlet while repeating this series of processes.

Since the conventional vertical firing furnace continuously fires the raw materials on one side while freely dropping the raw materials, the inlet of the upper end of the kiln is formed so that the outlet and the center of the lower end are greatly displaced from each other, so that the center of gravity is shifted to one side. There was a problem that the installation cost is high because it requires a lot of space when installing the support to support the weight of the kiln.

In addition, the conventional vertical firing furnace has a problem in that the raw material flows from the upper end to the lower end, so that the stirring of the upper and lower layers of the raw material is not performed properly, and thus the quality of the fired product is deteriorated.

Therefore, the present invention is to solve the conventional problems as described above, because the inlet and outlet are located on the same vertical line does not require a lot of space when installing the support, the installation cost is low and the flow of the raw material is smooth, so that the firing rate The purpose is to provide a vertical furnace with improved product quality.

In order to achieve the above object, the present invention provides a firing furnace body in which a product is fired by an input port through which raw materials are input at an upper end, an outlet through which raw materials are discharged at a lower end, and heat of combustion in a plurality of flat sections. In a vertical furnace having a;

The kiln body has a primary inclined surface in which the front lower end of the inlet is bent inwardly and the lower end of the inlet in front of the first inclined plane is vertically outwardly bent downward again and the first combustion chamber has two burner balls perforated. A second combustion chamber having a secondary inclined surface bent inwardly inwardly of the first combustion chamber and a lower end of the primary inclined surface in front of the second inclined surface vertically outwardly bent downward again and having two burner balls perforated; A third combustion chamber having a tertiary inclined surface bent inwardly at a combustion chamber and a lower end of the secondary inclined surface at the front side of the tertiary inclined surface vertically outward and bent perpendicularly downward again, and one burner hole perforated in each side; The lower end of the third combustion chamber has a fourth inclined surface bent inwardly and the bottom of the third inclined surface in front of the fourth inclined surface protrudes outward and is perpendicular to the lower side again. The fourth combustion chamber, which is curved and perforated with one burner hole in each side, is located at the same vertical line as the inlet at the lower end of the fourth combustion chamber, and the combustion hole is drilled between the discharge port and the fourth inclined plane. It is composed of a recovery port having an air recovery hole.

The vertical furnace is a cooling fan for forcibly supplying the external cooling air to the lower end of the firing furnace by the cooling air engine to the outlet of the firing furnace body;

An exhaust suction fan coupled to the upper inlet of the kiln body by an exhaust gas pipe and forcibly releasing air inside the kiln to the atmosphere through an exhaust filter;

One end is connected to the upper part of the recovery port of the kiln body, and the heated combustion air is introduced through a dedusting device that removes the fine powder of the introduced air, and the other end is connected to each burner hole of the first, second, third and fourth combustion chambers. Combustion air fan having a combustion air engine forcibly introducing combustion air to ignite in the kiln, and

It is characterized by further comprising an auxiliary air fan having an auxiliary air engine forcibly supplying burner auxiliary air to a plurality of kiln body.

1 is a partially cutaway perspective view showing the embodiment of the present invention,

Figure 2 is a front cross-sectional view showing an operating state of the present invention,

Figure 3 is a front sectional view showing a state of the conventional vertical furnace.

* Description of the symbols for the main parts of the drawings *

1: vertical furnace 10: kiln body

10a: fireproof lead and 10b: insulated lead

10c: heat insulating material 11: inlet

12 Outlet 13a, 13b, 13c, 13d: 1st, 2nd, 3rd, 4th combustion chamber

14a, 14b, 14c, 14d: Burner ball 15, 16, 17, 18: 1,2, 3, 4th slope

19: recovery port 19a: combustion air recovery

20 combustion air fan 21 combustion engine

22: fine powder removal device 30: cooling fan

31 cooling engine 40: exhaust suction fan

41 exhaust gas pipe 42 bag filter

50: auxiliary air fan 51: auxiliary air

61: raw material dispersion device 62: feeder (feeder)

63: service hopper 64: discharge device

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a partial cutaway perspective view showing an embodiment of the present invention, Figure 2 is a front sectional view of the operating state showing the operating state of the present invention.

The vertical furnace (1) of the present invention has an inlet (11) into which the raw material is input at the upper end and has an outlet (12) through which the product is discharged at the lower end. 13d) and burner holes 14a, 14b, 14c, and 14d, the furnace body 10 in which the firing of the product is caused by combustion heat, and the exhaust gas pipe 41 connected to the inlet 11 to discharge the combustion gas into the atmosphere. Cooling fan 30 having an exhaust suction fan 40 having an air inlet), a cooling air engine 31 connected to the discharge port 12 to introduce external air into the kiln body 1, and the kiln body 1 of the Auxiliary air having a combustion air fan 20 having a combustion air engine 21 for supplying fuel and combustion air to the burner holes 14a, 14b, 14c, and 14d, and an auxiliary air engine 51 for supplying auxiliary air to the burner. It consists of a fan 50.

The kiln body 10 has a flat cross section having a quadrangular shape, and the inner wall surface is formed by stacking refractory wires 10a, and the fireproof wires 10a and the heat insulating edges 10b on the outer wall surface. ) Is formed by laminating the heat insulating edge and the outer wall surface of the heat insulating edge 10b. The heat insulating material 10c is formed on the outer sidewall of the heat insulating edge 10b, and the temperature of the raw material is preheated from the inlet 11 to the upper end of the first combustion chamber 13a. The temperature at which the raw material is fired from the preheating zone (A) at a temperature of 200 to 300 ° C. and the fourth inclined surface (18) at the lower end of the fourth combustion chamber (13d) from the first combustion chamber (13a), which is the lower end of the preheater (A), to the temperature. The baking table B of 1,100-1,300 degreeC, and the cooling stand C which cools a product from the lower end of the 4th slope 18 which is the lower end of the baking table B to the discharge port 12 are comprised. Combustion zone B is composed of four combustion spaces of the first, second, third, and fourth combustion chambers 13a, 13b, 13c, and 13d, and includes a preheating zone for forming cocurrent gas and preheating combustion air. B) A port is installed in the middle part.

The kiln body 10 has a primary inclined surface 15 in which the lower rear end of the inlet 11 is inclined inwardly, and the lower end of the inlet 11 in front of the primary inclined surface 15 is vertically projected outward to be downward again. The first combustion chamber 13a, which is bent at a right angle, and the two burner holes 14a are perforated, and the secondary inclined surface 16 has a secondary inclined surface 16 having a lower end of the first combustion chamber 13a bent inwardly. The lower end of the first inclined surface 15 of the vertical projection is outward bent perpendicularly downward again and the second burner chamber (13b) and two burner holes (14b) and the lower end of the second burner chamber (13b) are bent inwardly inclined. It has a tertiary inclined surface 17 and the lower end of the secondary inclined surface 16 on the front side of the tertiary inclined surface 17 is vertically projected outward and bent perpendicularly downward again, and one burner hole 14c is drilled in each side. The fourth inclined surface 13c and the fourth inclined surface 18 having a fourth inclined surface 18 bent inwardly inclined to the third combustion chamber 13c (18) The fourth combustion chamber 13d and the fourth combustion chamber in which the lower end of the front inclination surface 17 protrudes vertically outward and are bent perpendicularly downward, and one burner hole 14d is drilled in each of the two sides. 13d, a discharge air hole 12a which is positioned at the same vertical line as the inlet 11 at the lower end thereof, and is drilled between the outlet 12 and the fourth inclined plane 18, in which the raw material is discharged downward. It is composed of a recovery port 19 having a).

Heat transfer in the first, second, third, and fourth combustion chambers 13a, 13b, 13c, and 13d, which are combustion spaces, is mainly performed on the walls of the flame and the furnace body 10, and liquefied petroleum gas, bunker C oil, heavy oil, etc. This is achieved by heat exchange between the livers, but the temperature of the flame is associated with factors that hinder the quality of the lime. That is, in order to prevent local overburning, especially in small combustion spaces, it is easy to underestimate, and therefore, the flame temperature should not be too high. The combustion air rate should be increased in the four combustion chambers 13a, 13b, 13c, and 13d.

Accordingly, the first, second, third, and fourth combustion chambers 13a, 13b, 13c, and 13d have a large array of exhaust gases from the lower combustion space due to their special arrangement and dimensions, and their heat is released from the baking table B. Move to the upper combustion chamber to cool the flame. The temperature of each combustion chamber 13a, 13b, 13c, 13d is sensed by a thermocouple, and adjusts flow volume automatically. Temperature control is adjusted according to the quality of limestone, and the temperature control range in the first, second, third and fourth combustion chambers 13a, 13b, 13c and 13d is 1,100 to 1,300 ° C.

The cooling fan 30 is forcibly supplying external cooling air to the lower end opening 12 of the kiln body 10 by the cooling air engine 31 to the bottom of the kiln body 10.

The exhaust suction fan 40 is hermetically coupled to the upper inlet 11 of the kiln body 10 by the exhaust gas pipe 41 to force the air inside the kiln body 10 to the atmosphere through the exhaust filter 42. To release.

Combustion air fan 20 is one end is piped to the upper end of the recovery port 19 of the kiln body 10 and the warm air is introduced through the fine dust removal device 22 to remove the fine dust of the introduced air and the other end is The furnace body 10 by forcibly introducing fuel such as liquefied petroleum gas and combustion air into the burner holes 14a, 14b, 14c, and 14d of the 1,2,3,4 combustion chambers 13a, 13b, 13c, and 13d. It consists of a combustion air engine 21 which plays a role of the burner which ignites in the front end.

Referring to the operation of the present invention in detail as follows.

The raw materials are supplied and transported by the skip hoist to the service hopper 63 located above the kiln body 10 and sequentially transferred to the three service hoppers 63 in which air inflow is blocked. The device 62 is introduced into the kiln body 10 through the inlet 11.

The raw stone supplied to the preheating zone A is dried by the exhaust gas of the exhaust suction fan 40 through an exhaust gas pipe 41 that counter flows and is preheated to a decomposition temperature of 500 to 800 ° C.

Exhaust gas (200-250 ° C.) from the upper part of the kiln body 10 is discharged to the exhaust gas pipe 41 by the exhaust suction fan 40 and collected by a bag filter 42 and then through the chimney. Emitted to the atmosphere.

The kiln body 10 in which the raw material falls due to its own weight is fired while passing through four combustion chambers of the first, second, third, and fourth combustion chambers 13a, 13b, 13c, and 13d. In the first and second combustion chambers 13a and 13b, which are the second combustion spaces, burner holes 14a and 14b in which two combustion engines 21 are positioned are disposed left and right, respectively. In the third and fourth combustion chambers 13c and 13d, burner holes 14c and 14d in which combustion engines 21 are located are disposed to face each other on both sides of the combustion space.

The raw material falling by its own weight and positioned on the primary inclined surface 15 receives heat by the flame sprayed from the combustion air engine 21 located in the burner hole 14a of the first combustion chamber 13a. At this time, the raw material in the direction of the first combustion chamber 13a that flows by the weight on the primary inclined surface 15 to face the flame is smoothly fired, but the raw material which is buried therein and is in contact with the primary inclined surface 15 is Without firing is smoothly flows from the primary slope 15 to the bottom by its own weight.

When the product of the lower part is discharged through the outlet 12 of the kiln body 10, the raw material inside the kiln body 10 gradually flows to the bottom in order to fill up the seat, which was located on the lower surface of the primary slope 15. The raw material faces the combustion air engine 21 emitting the flame through the burner hole 14b of the second combustion chamber 13b, so that the firing is smoothly performed.

In the second combustion chamber 13b, the raw material smoothly fired by the flame flows into the third combustion chamber 13c by the second inclined surface 16, and both sides of the raw material that do not directly face heat in the second combustion chamber 13b are Firing is performed smoothly by facing the heat directly in the third combustion chamber 13c.

The raw material placed in the third combustion chamber 13c and calcined again flows through the tertiary inclined surface 17, moves to the fourth combustion chamber 13d, and is calcined again by heat emitted from both sides.

The raw material is agitated in the kiln body 10 through the first and second combustion chambers 13a and 13b and then agitated and baked, and then passes through the third and fourth combustion chambers 13c and 13d. Firing is performed smoothly while stirring.

The product, which is fired through the fourth combustion chamber 13d, is moved to the lower outlet 12 through the fourth inclined surface 18, and at this time, the kiln body 10 through the cooling air pipe 31 of the cooling fan 30. Cooled outside air introduced into the outlet 12 of the) rises while flowing between the product and the product to cool the temperature of the product to 70 ~ 90 ℃, this external air passes between the products and the temperature is raised, The compressed air is introduced into the combustion air engine 21 of the combustion air fan 20 through the recovery port 19 through the combustion air recovery hole 19a.

That is, after cooling the product in the lower part of the kiln body 10 through the cooling fan 30, the heat recovery is maximized by using the hot gas sufficiently preheated through the fine powder removal device 22. Do it.

In order to more smoothly supply heat due to the flame of the combustion air engine 21 by the combustion air fan 20 inside the hermetically sealed kiln body 10, the outside of the kiln body 10 in a plurality of places by the auxiliary air fan 50. An auxiliary air engine 51 for supplying auxiliary air of air is configured.

Lime, which is a raw material, is passed to the cooling zone C that is cooled by the countercurrent air after passing through the baking zone B.

The air of the cooling table C is forcibly supplied with air by the cooling air engine 31 of the cooling fan 30, and the product cooling and the preheating of the combustion air are simultaneously performed.

Discharge of the fired product through the outlet 12 of the kiln body 10 consists of a discharge device 64 which is operated as a pusher by two hydraulic cylinders separated into left and right, and each discharge device ( 64 is composed of a two-stage feeding device 62 moving in stages to block the air inlet. The product discharge is controlled in batch units and the product discharge frequency is controlled in relation to the raw stone injection level, of course, to keep the flow in the kiln body 10 constant.

The present invention is 30 ~ 70mm, the use range of the raw material is large, the size adjustment range is large, it is possible to reduce the power cost, compared to 12 to 15% of other kilns, the micronization rate is less than 8%, the vertical structure of the product It has excellent discharge capacity, low internal pressure by load, and has a large combustion chamber, which makes it possible to use various fuels such as gas, pulverized coal and oil.

As such, the present invention does not require a lot of space when the inlet and outlet are located on the same vertical line, the installation cost is low and the flow rate of the raw material is smoothly improved, so that the firing rate is improved, the product quality is excellent.

Claims (2)

In the vertical baking furnace having an inlet through which the raw material is input at the top, an outlet through which the product is discharged at the lower end, and a firing furnace body in which the firing of the product is caused by the heat of combustion combusted in a plurality of places in a flat section; The kiln body 10 has a primary inclined surface 15 in which the front lower end of the inlet 11 is inclined inwardly, and the lower end of the inlet 11 in front of the primary inclined surface 15 is vertically projected outward to be downward again. The first combustion chamber 13a, which is bent at a right angle, and the two burner holes 14a are perforated, and the secondary inclined surface 16 has a secondary inclined surface 16 having a lower end of the first combustion chamber 13a bent inwardly. The lower end of the first inclined surface 15 of the vertical projection is outward bent perpendicularly downward again and the second burner chamber (13b) and two burner holes (14b) and the lower end of the second burner chamber (13b) are bent inwardly inclined. It has a tertiary inclined surface 17 and the lower end of the secondary inclined surface 16 on the front side of the tertiary inclined surface 17 is vertically projected outward and bent perpendicularly downward again, and one burner hole 14c is drilled in each side. The fourth inclined surface 18 has a third combustion chamber 13c and a fourth inclined surface 18 having a lower end of the third combustion chamber 13c bent inwardly. The fourth combustion chamber 13d and the fourth combustion chamber 13d each of which the lower end of the front inclination surface 17 protrudes vertically outward and are bent perpendicularly downward again and are perforated with one burner hole 14d on each side. Located at the bottom of the inlet 11 and the same vertical line and has a discharge port 12, the raw material is discharged to the bottom, and a combustion air recovery hole (19a) drilled between the discharge port 12 and the fourth inclined surface 18 Vertical firing furnace, characterized in that consisting of a recovery port (19). The method of claim 1; A cooling fan 30 for forcibly supplying external cooling air to the lower end of the kiln body 10 by the cooling air engine 31 toward the bottom of the kiln body 10; An exhaust suction fan coupled to an upper end opening 11 of the kiln body 10 by an exhaust gas pipe 41 to forcibly release air in the kiln body 10 to the atmosphere through the exhaust filter 42 ( 40); One end is piped to the upper end of the recovery port 19 of the kiln body 10 and the warm combustion air is introduced through the fine powder removal device 22 for removing the fine powder of the introduced air. Combustion having a combustion engine 21 for forcibly injecting fuel and combustion air into the burner holes 14a, 14b, 14c, and 14d in the combustion chambers 13a, 13b, 13c, and 13d to ignite in the kiln body 10. Air fan (20) and Firing furnace body (10) Vertical firing furnace characterized in that it further comprises an auxiliary air fan (50) having an auxiliary air engine (51) forcibly supplying oxygen of the outside air to a plurality of places.