阅读说明：本技术 回转窑外装式节能焙烧系统 (External mounting type energy-saving roasting system of rotary kiln ) 是由 谢遂槐 仝晓明 谢伊超 王玉杰 谢宏超 于 2021-11-12 设计创作，主要内容包括：本发明公开了一种回转窑外装式节能焙烧系统,以解决现有回转窑的换热效率和产量难以兼顾以及风道检修费用高昂的技术问题。其包括回转窑窑体和窑体内腔,所述回转窑窑体为筒状,包括窑体内壁和窑体外壁,所述窑体内壁设有耐火材料层,所述窑体外壁设有换热装置,所述换热装置包括风道筒和旋转密封构件。本发明回转窑外装式节能焙烧系统的风道、保温层设计在窑体外侧,尺寸将不受影响,换热风道加宽风速降低,保温层也加厚,换热效果会更好。(The invention discloses an externally-mounted energy-saving roasting system of a rotary kiln, which aims to solve the technical problems that the heat exchange efficiency and the yield of the conventional rotary kiln are difficult to take into account and the maintenance cost of an air duct is high. The rotary kiln comprises a rotary kiln body and a kiln body inner cavity, wherein the rotary kiln body is cylindrical and comprises a kiln body inner wall and a kiln body outer wall, a refractory material layer is arranged on the kiln body inner wall, a heat exchange device is arranged on the kiln body outer wall, and the heat exchange device comprises an air duct cylinder and a rotary sealing component. The air duct and the heat-insulating layer of the external energy-saving roasting system of the rotary kiln are designed outside the kiln body, so that the size is not influenced, the widened air speed of the heat exchange air duct is reduced, the heat-insulating layer is thickened, and the heat exchange effect is better.)

1. The utility model provides an energy-conserving calcination system of rotary kiln external dress formula, includes the rotary kiln body and kiln body inner chamber, the rotary kiln body is the tube-shape, including kiln internal wall and kiln external wall, its characterized in that: the kiln body inner wall is equipped with refractory material layer, kiln body outer wall is equipped with heat transfer device, heat transfer device includes an air duct section of thick bamboo and rotary seal component.

2. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 1, characterized in that: the air duct cylinder comprises an air duct cylinder left end portion, an air duct cylinder right end portion and an air duct cylinder circumferential portion, the rotary sealing component is mounted at the air duct cylinder left end portion and the air duct cylinder right end portion, the air duct cylinder is sleeved on the kiln body outer wall, an inner air duct layer is formed among the rotary sealing component, the air duct cylinder circumferential portion and the kiln body outer wall, and a heat insulation layer is further arranged between the air duct layer and the air duct cylinder circumferential portion.

3. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 1, characterized in that: the air duct cylinders are arranged in parallel to form more than two air duct cylinders, the adjacent air duct cylinders are communicated through a connecting pipeline, and the length of each air duct cylinder is matched with that of the rotary kiln body.

4. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 1, characterized in that: the rotary sealing component comprises a sealing part and a limiting part, and the limiting part is tightly pressed on the sealing part; the sealing part comprises a plurality of carbon bricks which are arranged along the circumferential direction of the outer wall of the kiln body, a limiting block is arranged between every two adjacent carbon bricks, and the limiting block is connected with a compression spring; and a backing plate is arranged along the circumferential direction of the outer wall of the kiln body and is positioned between the outer wall of the kiln body and the carbon brick.

5. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 4, characterized in that: the air duct cylinder is fixed on the ground, the rotary sealing component is fixed on the air duct cylinder, and the air duct cylinder is rotatably connected with the rotary kiln body, so that the air duct cylinder is convenient to maintain without influencing the roasting reaction of the inner cavity of the kiln body.

6. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 2, characterized in that: the air duct layer is provided with an air duct layer air inlet and an air duct layer air outlet, the air duct layer air inlet is communicated with an oxygen supply fan, and the air duct layer air outlet is communicated with the inner cavity of the kiln body.

7. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 1, characterized in that: the refractory material layer is formed by building and connecting a plurality of customized refractory bricks, the thickness of the refractory bricks is 60-300mm, and the refractory bricks are tightly built on the inner wall of the kiln body.

8. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 2, characterized in that: the outer side of the heat insulation layer is a cylindrical steel pipe-shaped air duct cylinder circumference portion, the inner side of the heat insulation layer is a cylindrical steel pipe-shaped heat insulation layer fixing portion, and heat insulation materials are filled between the heat insulation layer fixing portion and the air duct cylinder circumference portion to serve as heat insulation layers.

9. The externally-mounted energy-saving roasting system of the rotary kiln as claimed in claim 8, characterized in that: and the air duct layer is internally provided with radiating fins which are fixed on the heat-insulating layer fixing part and/or the outer wall of the kiln body.

Technical Field

The invention relates to the technical field of rotary kilns, in particular to an externally-mounted energy-saving roasting system of a rotary kiln.

Background

The energy-conserving calcination system of current rotary kiln sets up intermediate layer heat transfer device in the internal portion of kiln, and the heat that the recycle roasting reaction was given off heats the air, and the air after the heating gets into the rotary kiln from the discharge end and takes place the roasting reaction with molybdenum concentrate. Wherein wind channel, heat preservation all design in the internal side of rotary kiln, the intercommunication mouth in wind channel is narrow and small, for guaranteeing stable in structure and heat transfer wind unobstructed, just need increase the total thickness of structure, need reduce the internal diameter of kiln this moment. However, the larger the inner diameter of the rotary kiln, the larger the output, and the larger the inner diameter of the kiln body is required to ensure the output. Because the size of the rotary kiln is limited by a plurality of factors, and the total thickness of the structure is equal to the inner diameter of the kiln, the structure needs to be compressed to ensure the inner diameter of the kiln body, and the inner diameter of the kiln body needs to be reduced to ensure the stability of the structure, the two terms are mutually contradictory. And because the air duct is located at the inner side of the rotary kiln body, when the internal structure has a fault, the production is stopped for maintenance, the maintenance cost of single kiln stopping is up to dozens of ten thousand yuan, and the maintenance cost is higher.

In addition, the castable used in the kiln of the existing rotary kiln is constructed manually, so that the construction effect of uniform thickness and uniform texture cannot be guaranteed, the construction thickness of the castable is only 40-60mm, the castable is easy to fall off after thermal expansion, and the kiln needs to be stopped for maintenance in severe cases.

Disclosure of Invention

The invention aims to provide an external energy-saving roasting system of a rotary kiln, which aims to solve the technical problems that the heat exchange efficiency and the yield of the existing rotary kiln are difficult to be considered and the maintenance cost of an air duct is high.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides an energy-conserving calcination system of rotary kiln external dress formula, includes the rotary kiln body and kiln body inner chamber, the rotary kiln body is the tube-shape, including kiln internal wall and kiln external wall, kiln internal wall is equipped with refractory material layer, kiln external wall is equipped with heat transfer device, heat transfer device includes an air duct section of thick bamboo and rotatory sealing member.

Preferably, the air duct cylinder comprises a left end portion of the air duct cylinder, a right end portion of the air duct cylinder and a circumferential portion of the air duct cylinder, the rotary sealing member is mounted at the left end portion of the air duct cylinder and the right end portion of the air duct cylinder, the air duct cylinder is sleeved on the outer wall of the kiln body, an inner air duct layer is formed among the rotary sealing member, the circumferential portion of the air duct cylinder and the outer wall of the kiln body, and a heat insulation layer is further arranged between the air duct layer and the circumferential portion of the air duct cylinder.

Preferably, the air duct cylinders are arranged in parallel to form more than two air duct cylinders, adjacent air duct cylinders are communicated through a connecting pipeline, and the length of each air duct cylinder is matched with that of the rotary kiln body.

Preferably, the rotary sealing member includes a sealing portion and a stopper portion, and the stopper portion is pressed against the sealing portion; the sealing part comprises a plurality of carbon bricks which are arranged along the circumferential direction of the outer wall of the kiln body, a limiting block is arranged between every two adjacent carbon bricks, and the limiting block is connected with a compression spring; and a backing plate is arranged along the circumferential direction of the outer wall of the kiln body and is positioned between the outer wall of the kiln body and the carbon brick.

Preferably, the air duct cylinder is fixed on the ground, the rotary sealing member is fixed on the air duct cylinder, and the air duct cylinder is rotatably connected with the rotary kiln body, so that the roasting reaction of the inner cavity of the kiln body is not influenced when the air duct cylinder is maintained.

Preferably, the air duct layer is provided with an air duct layer air inlet and an air duct layer air outlet, the air duct layer air inlet is communicated with an oxygen supply fan, and the air duct layer air outlet is communicated with the inner cavity of the kiln body.

Preferably, the refractory material layer is formed by building and connecting a plurality of customized refractory bricks, the thickness of the refractory bricks is 60-300mm, and the refractory bricks are tightly built on the inner wall of the kiln body.

Preferably, the outer side of the heat insulation layer is a cylindrical steel pipe-shaped air duct cylinder circumference portion, the inner side of the heat insulation layer is a cylindrical steel pipe-shaped heat insulation layer fixing portion, and heat insulation materials are filled between the heat insulation layer fixing portion and the air duct cylinder circumference portion to serve as heat insulation layers.

Preferably, the air duct layer is internally provided with radiating fins which are fixed on the heat-insulating layer fixing part and/or the outer wall of the kiln body.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the air duct and the heat-insulating layer of the external energy-saving roasting system of the rotary kiln are designed outside the kiln body, so that the size is not influenced, the widened air speed of the heat exchange air duct is reduced, the heat-insulating layer is thickened, and the heat exchange effect is better.

2. The air duct of the external energy-saving roasting system of the rotary kiln is arranged externally, the construction is convenient, the rotary kiln can be maintained without stopping the rotary kiln, the manufacturing cost is reduced, a single rotary kiln comprises more than two groups of heat exchange structures, the heat exchange can be carried out in a segmented mode, and the heat utilization rate is higher.

3. The customized refractory bricks with the thickness of 60-300mm are built in the rotary kiln, so that the customized refractory bricks are not easy to fall off, the service life is long, and the condition of maintenance is almost avoided.

Drawings

FIG. 1 is a schematic view of an externally mounted energy-saving roasting system of a rotary kiln according to the present invention.

Fig. 2 is a cross-sectional view at a in fig. 1.

FIG. 3 is a schematic view of a heat exchange apparatus according to the present invention.

FIG. 4 is a schematic view of the communication between two sets of heat exchange devices.

FIG. 5 is a schematic view of a rotary kiln of the external energy-saving roasting system of the rotary kiln of the present invention.

In the figure, 1 is a refractory material layer, 2 is a rotary kiln body, 3 is an air duct layer, 31 is a left end fixing steel plate of an air duct cylinder, 32 is a right end fixing steel plate of the air duct cylinder, 4 is an inner steel plate of a heat preservation layer, 5 is a heat preservation layer, 6 is a fixing steel cylinder at the periphery of the air duct cylinder, 7 is a rotary sealing component, 71 is a backing plate, 72 is a carbon brick, 73 is a limiting block, 74 is a compression spring, 8 is a connecting air duct, 9 is a fan, 10 is an air duct air inlet, and 11 is a discharge box.

Detailed Description

The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.

Example 1: an external energy-saving roasting system of a rotary kiln is disclosed, and referring to fig. 1-3, the external energy-saving roasting system comprises a rotary kiln body 2, wherein the rotary kiln body 2 is cylindrical, a refractory material layer 1 is arranged on the inner wall of the rotary kiln body 2, and a heat exchange device is arranged on the outer wall of the rotary kiln body 2 and comprises an air duct cylinder and a rotary sealing member 7. The air duct cylinder comprises an air duct cylinder left end fixing steel plate 31, an air duct cylinder right end fixing steel plate 32 and an air duct cylinder circumference fixing steel cylinder 6, the air duct cylinder left end fixing steel plate 31 and the air duct cylinder right end fixing steel plate 32 are circular steel plates, and the air duct cylinder circumference fixing steel cylinder 6 is cylindrical. The air duct cylinder is sleeved on the outer wall of the rotary kiln body 2 and fixed on the ground, and the air duct cylinder is rotatably connected with the rotary kiln body 2, so that the roasting reaction in the rotary kiln body 2 is not influenced when the air duct cylinder is maintained. Rotary sealing components 7 are respectively arranged at the left end part fixing steel plate 31 and the right end part fixing steel plate 32 of the air duct cylinder, a hollow air duct layer 3 is formed among the rotary sealing components 7, the peripheral fixing steel cylinder 6 of the air duct cylinder and the outer wall of the rotary kiln body 2, and the air duct layer 3 plays a role in heat exchange; an insulating layer 5 is also arranged between the air duct layer 3 and the fixed steel cylinder 6 at the periphery of the air duct cylinder, the insulating layer 5 is fixed with the fixed steel cylinder 6 at the periphery of the air duct through an inner steel plate 4 of the insulating layer, and insulating materials are filled in the insulating layer 5. The heat preservation layer 5 plays a role in heat preservation, is 120mm thick, is made of high-purity aluminum silicate fiber materials, can reduce heat loss, and guarantees heat exchange temperature. The heat insulation layer is not easy to loosen after being used at high temperature for a long time, so that the heat insulation effect is ensured, and the service life of the heat insulation layer 5 is prolonged.

A backing plate 71 is arranged along the circumferential direction of the outer wall of the rotary kiln body 2, and the backing plate 71 is a cylindrical steel plate and is sleeved on the outer wall of the rotary kiln body 2. A plurality of carbon bricks 72 are arranged next to the backing plate 71, and the plurality of carbon bricks 72 are arranged along the circumferential direction of the outer wall of the rotary kiln body 2. The backing plate 71 and the plurality of carbon bricks 72 constitute a sealing portion of the rotary seal member 7 for sealing the air duct layer 3. A limiting block 73 is arranged between two adjacent carbon bricks, the limiting block 73 is connected with a compression spring 74, and the limiting block 73 is further fastened through bolts. The stopper 73, the bolt, and the compression spring 74 constitute a stopper portion of the rotary seal member 7 for fastening the seal portion of the rotary seal member 7. When the rotary kiln body 2 rotates to work, the rotary kiln body 2 is rotatably connected with the backing plate 71, the backing plate 71 does not rotate, the carbon brick 72 is likely to move due to vibration caused by rotation of the rotary kiln body 2, and the movement of the carbon brick 72 is limited through the arrangement of the bolt, the limiting block 73 and the compression spring 74, so that the carbon brick does not move when the rotary kiln body 2 rotates to work, and a good sealing effect is achieved.

Refractory bricks or other refractory materials are completely built in the rotary kiln, the refractory material layer 1 is built in the rotary kiln body 2, the thickness can be 60-300mm, and the refractory material layer 1 plays a role in protecting the temperature in the kiln and buffering the temperature. The refractory layer 1 has a long service life and is almost maintenance free. The construction effect of uniform thickness and texture can be achieved, and the steel plate is not easy to fall off after thermal expansion. In this embodiment, the refractory layer is 100mm thick, and can effectively ensure the constancy of the temperature in the kiln, and even if the temperature in the kiln changes, the variation can be ignored completely. If the refractory material layer 1 is not used, the rotary kiln body 2 is directly contacted with high-temperature materials, the rotary kiln body 2 can quickly transfer heat to the air duct layer 3, so that the reaction temperature is sharply reduced, and unqualified materials are easy to appear. And the refractory material layer 1 can prevent the rotary kiln body 2 from directly contacting high-temperature materials, thereby preventing the rotary kiln body 2 from being deformed and damaged by high temperature and prolonging the service life of the rotary kiln body 2.

The invention relates to an external energy-saving roasting system of a rotary kiln, which mainly absorbs heat emitted by the outer wall of the rotary kiln and recycles the heat emitted by the outer wall of the rotary kiln. The heated gas can enter the rotary kiln, and can also enter other systems, for example, the gas can also be used for drying molybdenum concentrate with the moisture content of less than 20%, the waste heat is fully utilized, and the heat loss is effectively reduced.

The air duct and the heat preservation layer of the external energy-saving roasting system of the rotary kiln are designed on the outer side of the kiln body, the size is not influenced, the widening air speed of the heat exchange air duct is reduced, the heat preservation layer is thickened, the heat exchange effect is better, the construction is convenient, the maintenance can be carried out without stopping the kiln, the manufacturing cost is reduced, the segmented heat exchange can be carried out, and the heat utilization rate is higher.

Example 2: an external energy-saving roasting system of a rotary kiln is disclosed, and the external energy-saving roasting system is shown in figures 1-5 and comprises a refractory material layer 1, a rotary kiln body 2, an air duct layer 3, a heat-insulating layer inner layer steel plate 4, a heat-insulating layer 5, an air duct cylinder left end fixing steel plate 31, an air duct cylinder right end fixing steel plate 32, an air duct cylinder periphery fixing steel cylinder 6, a rotary sealing member 7, a connecting air duct 8, a fan 9 and a discharge box 11.

The outer wall of the rotary kiln body 2 is sleeved with an air duct cylinder which is fixed on the ground. The fixed steel plate 31 of the left end part of the air duct cylinder, the fixed steel plate 32 of the right end part of the air duct cylinder and the fixed steel cylinder 6 of the circumference part of the air duct cylinder are positioned outside the rotary kiln body 2, the rotary sealing component 7 is positioned at two sides of the fixed steel plate 31 of the left end part of the air duct cylinder and the fixed steel plate 32 of the right end part of the air duct cylinder, and the heat insulation layer 5 is positioned at the inner side of the fixed steel cylinder 6 of the circumference part of the air duct cylinder. The air duct layer 3 is formed by a rotary sealing member 7, an insulating layer 5 and a closed space between the rotary kiln body 2.

The fan 9 is mounted on the ground: in order to adapt to materials with low grade, the heat of tail gas in a rotary kiln system is utilized as much as possible. Air enters the air duct layer 3 through the fan 9 and the rotary sealing component 7, so that the temperature of heat exchange air is further improved, and roasting of low-grade molybdenum concentrate is guaranteed. The blower 9 is arranged on the ground, so that the power supply contact failure of the blower 9 and the danger of electric shock of personnel can be avoided.

The single rotary kiln comprises more than two groups of air duct cylinders arranged side by side, and the two adjacent air duct cylinders are communicated through a connecting air duct 8. The air inlet 10 of the air duct is communicated with the fan 9, the air outlet of the air duct layer 3 is communicated with the inner cavity of the rotary kiln, and the air in the air duct layer 3 absorbs the heat emitted by the outer wall of the rotary kiln and transmits the heat to the rotary kiln for recycling. The tail end of the rotary kiln is provided with a discharging box 11 for discharging.

Furthermore, the air duct layer 3 is internally provided with radiating fins which can be welded on the rotary kiln body 2 and also can be welded on the steel plate 4 at the inner layer of the heat-insulating layer.

The invention is explained in detail above with reference to the drawings and the embodiments; however, it will be understood by those skilled in the art that various changes in the specific parameters of the embodiments described above may be made or equivalents may be substituted for elements thereof without departing from the scope of the present invention, so as to form a plurality of specific embodiments, which are all common variations of the present invention and will not be described in detail.