CN201402036Y - Medium stone lime shaft kiln - Google Patents

Abstract

The utility model relates to a zhong shi lime shaft kiln, which mainly comprises a furnace outer body, an liner, a chimney, a feeder, an ash discharging device, a composite fire grate; the liner is located in the furnace outer body, the feeder is located at the upper end of the liner, the composite fire grate is located at the lower end of the liner, the ash discharging device is located under thecomposite fire grate; a ring-shaped flue is arranged around the upper port of the liner, and the inner side of the ring-shaped flue is communicated with the inside of the liner, the ring-shaped flueis communicated with a flue gas dust wind pipe (chimney), a blower is arranged under the composite fire grate. The shape of the liner for the zhong shi lime shaft kiln facilitates the preheating, calcining and cooling of the materials. The ring-shaped flue and the blower form a ventilation mechanism of 'upper-drawing and lower-blowing', which facilitates the heat exchange between the materials during the course of moving downward and the gas and the full combustion of the fuel, and increases the quality and output of the products, and reduces the energy consumption. The umbrella-shaped fire grate enlarges the ventilation area, and increases the thermal efficiency. The multilayer outer body structure greatly increases the thermal insulation, and can further reduce the energy consumption.

Description

Medium stone lime shaft kiln

technical field

The utility model relates to a vertical lime kiln for medium stone, in particular to roasting equipment for producing lime, which belongs to the technical field of lime production equipment in the building material industry.

Background technique

Most of the kilns for lime production in domestic small and medium-sized enterprises are earthen kilns and ordinary shaft kilns. This type of kiln generally adopts natural ventilation, relying on the negative pressure suction of the kiln itself, and because the bottom of the kiln adopts a flat-bottomed grate, the air intake area is small, and coupled with the influence of the climate, the suction is often insufficient and the air flow is insufficient, resulting in incomplete fuel. Combustion, the temperature of the kiln is lowered, resulting in the problems of poor lime quality, low output and high energy consumption. The country has expressly stipulated that it should be eliminated.

Contents of the invention

The purpose of the utility model is to overcome the above disadvantages, thereby providing a high degree of mechanization, which can improve production and quality, mechanical forced ventilation, sufficient oxygen supply, reduced energy consumption, improved working environment, less investment, and good economic benefits. Lime shaft kiln.

According to the technical scheme provided by the utility model, the medium stone lime vertical kiln includes a furnace body, an inner tank, a chimney, a feeder, an ash unloading device, and a composite grate. Located at the lower end of the liner, the ash unloading device is located below the composite grate, and there is an annular flue around the upper opening of the liner, the inner side of which communicates with the interior of the liner, and the annular flue communicates with the flue gas dust removal duct (chimney). A blower is arranged below the compound fire grate.

The shape of the inner tank is vase-shaped, the upper part is conical with a positive truncated circular arc, and the lower part is conical with a positive truncated inverted circular arc. The composite fire grate is umbrella-shaped.

The inner container includes a refractory layer, an air heat insulation layer, and a red brick outer layer, the refractory layer is located inside, and an air heat insulation layer is between the red brick outer layer and the refractory layer.

The outer body includes a slag cushion layer, a red brick enclosure wall, a perlite heat insulation layer, and a red brick load-bearing structural wall arranged in sequence from the outside of the inner tank.

The refractory layer of the inner container is made of refractory bricks. The liner can be divided into three areas from top to bottom, namely the upper preheating area, the middle calcining area and the lower cooling area. The arc curve taper in the preheating zone gradually expands from top to bottom.

The inner layer of the furnace is made of refractory bricks, the middle is a heat insulation layer, and the outer layer is a brick structure; the cushion layer of the outer body is slag, and the enclosure wall and load-bearing structure are concrete structural columns and brick wall structures .

Compared with the prior art, the utility model has the following advantages:

The utility model has a simple, compact and reasonable structure; the shape of the inner tank is beneficial to the preheating, calcining and cooling of materials therein. Its annular flue and blower form a ventilation mechanism of "upward suction and downward delivery", which is conducive to the heat exchange between materials and gas during the downward movement and the full combustion of fuel, which improves product quality and output, and reduces energy consumption. The umbrella-shaped grate expands the ventilation area and improves the thermal efficiency. The multi-layer outer body structure greatly improves heat insulation and further reduces energy consumption.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below the utility model will be further described in conjunction with the embodiment in the accompanying drawing:

As shown in Figure 1, it includes composite grate 1, air blower 2, annular flue 3, kiln protection ring 4, flue gas dust removal duct (chimney) 5, feeder 6, ash unloading device 7, refractory layer 8, air barrier Heat layer 9, red brick outer layer 10, slag cushion 11, red brick enclosure wall 12, perlite heat insulation layer 13, red brick load-bearing structural wall 14, upper preheating zone 15, middle calcining zone 16, lower The cooling zone 17, the inner tank, the outer body of the furnace, etc.

The inner tank of the utility model is located in the outer body of the furnace, the feeder 6 is located at the upper end of the inner tank, the kiln ring 4 is arranged under the feeder 6, the composite grate 1 is umbrella-shaped, and is located at the lower end of the inner tank, and the ash unloading device 7 is located at the grate 1 below. It also includes an annular flue 3 located around the upper opening of the liner, its inner side communicates with the interior of the liner, and the annular flue 3 communicates with the chimney 5 . A blower 2 is arranged below the composite fire grate 1 . The inner container is in the shape of a vase, the upper part of which is in the shape of a positive truncated circular arc curve, and the lower part is in the shape of a normal truncated inverted circular arc curve.

The inner container includes a refractory layer 8, an air heat insulation layer 9, and a red brick outer layer 10, the refractory layer 8 is located inside, and an air heat insulation layer 9 is between the red brick outer layer 10 and the refractory layer 8. The refractory layer of the inner container is made of refractory bricks. The outer body includes a slag cushion layer 11, a red brick enclosure wall 12, a perlite heat insulation layer 13, and a red brick load-bearing structural wall 14 arranged in sequence from the outside of the inner tank.

The liner of the utility model can be divided into three areas from top to bottom, namely the upper preheating area 15 , the middle calcining area 16 , and the lower cooling area 17 .

The circular arc curve taper of the preheating zone 15 gradually expands from top to bottom, which promotes the outward tumbling movement of the material during the falling process, which is not only conducive to the uniform decline of the material, but also continuously increases the cross-sectional area, which is beneficial to the gas and air. The heat exchange between the materials is carried out, and the preheating process of the airflow to the stone is fully utilized to reduce the loss of heat. The diameter change of the preheating zone not only adapts to the characteristics of the volume expansion of the material when it sinks and heats up, but also adapts to the situation that the volume of the gas rises as the temperature drops and the volume shrinks, so that the upper and lower airflow speeds tend to be consistent, and the material can obtain an ideal preheating effect. The cross-section of the calcining zone also gradually increases from top to bottom, and the airflow velocity decreases correspondingly with the continuous increase of the cross-section, which prolongs the residence time of the airflow in the calcining zone and improves the overall heat transfer coefficient, which is beneficial to gas and material The heat exchange process is fully carried out. The cross-section of the calcination zone gradually expands downwards, which reduces the bulk density of materials, increases the gap between materials, reduces the ventilation resistance, and greatly improves the ventilation effect, which is conducive to the full combustion of fuel and the utilization of heat energy, and accelerates the limestone The calcination improves the output and quality, and reduces the coal consumption. The cooling zone is in the shape of an inverted arc curve, the cross-section shrinks from top to bottom, so that the air velocity decreases from bottom to top, and the residence time of lime in this zone increases from top to bottom, which is conducive to the heat exchange between lime and air and cools the lime. Fully, the temperature of ash discharge is reduced, the loss of heat energy is reduced, and the energy consumption is reduced.

The utility model adopts a centrifugal fan for forced ventilation, changes the flat grate into an umbrella-shaped grate, and enlarges the area of the air inlet at the bottom; an annular flue is arranged around the upper kiln mouth, and relies on the height difference of the chimney to generate negative pressure to exhaust smoke, so that the kiln It operates under slightly positive pressure, which increases the air circulation in the kiln, strengthens the combustion, accelerates the decomposition rate of limestone in the kiln, and overcomes the insufficient air intake of natural ventilation and the influence of weather changes. The kiln body is composed of seven layers, which makes the kiln's sealing and heat preservation effect better, reduces the loss and diffusion of heat energy, and is an important measure for Zhongli lime shaft kiln to increase output, stabilize quality, improve efficiency and reduce coal consumption.

Claims (8)

1. A medium lime vertical kiln, comprising a furnace body, an inner tank, a chimney (5), a feeder (6), an ash unloading device (7), and a composite fire grate (1), characterized in that the inner tank is located in the furnace In the outer body, the feeder (6) is located at the upper end of the inner tank, the composite fire grate (1) is located at the lower end of the inner tank, the ash unloading device (7) is located under the composite furnace grate (1), and there is a ring smoke around the upper opening of the inner tank. Road (3), the inner side of which communicates with the interior of the liner, the annular flue (3) communicates with the flue gas dust removal air duct (5), and a blower (2) is arranged below the composite fire grate (1). 2. The vertical lime kiln according to claim 1, characterized in that the composite fire grate (1) is umbrella-shaped. 3. The medium stone lime shaft kiln according to claim 1, characterized in that the shape of the inner tank is vase-shaped, the upper part of which is in the shape of a positive truncated arc curve, and the lower part is in the shape of a positive truncated inverted arc curve. 4. The medium stone lime shaft kiln according to claim 1, characterized in that the inner tank includes a refractory layer (8), an air heat insulation layer (9), an outer layer of red brick (10), a refractory layer (8) Located on the inner side, the air heat insulation layer (9) is between the red brick outer layer (10) and the refractory layer (8). 5. The medium stone lime shaft kiln according to claim 1, characterized in that the outer body includes slag cushion (11), red brick enclosure wall (12), perlite Heat insulation layer (13), red brick load-bearing structure wall (14). 6. The medium stone lime shaft kiln according to claim 4, characterized in that the refractory layer (8) of the inner tank is made of refractory bricks. 7. The medium lime shaft kiln according to claim 1, characterized in that the liner can be divided into three areas from top to bottom, namely the upper preheating area (15) and the middle calcining area (16). , the lower cooling zone (17). 8. The vertical lime kiln according to claim 7, characterized in that said preheating zone (15) has a circular arc and a conical shape gradually expanding from top to bottom.

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