CN106931771A - A kind of rotary kiln molybdenum oxide roasting system of utilization waste heat to the oxygen supply of material bottom - Google Patents

Abstract

A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material. One end of the hot air channel is connected to the waste heat utilization system, and the other end passes the hot air in the hot air channel into the rotary kiln through the oxygen supply device for the bottom of the material. directly below the material. In the present invention, the oxygen supply device for the bottom of the material is adopted, and the hot air after heat exchange is directly passed into the bottom of the material. Since the material will be continuously thrown down during the rotation process and the continuous supply of the circulating hot air can ensure that the oxygen and the material are fully Mixing makes the roasting effect more perfect, so the effect for molybdenum trioxide is particularly good, and it can be completed once roasting, avoiding the inconvenience caused by repeated roasting, and the present application has changed the structure from the perspective of roasting, so for molybdenum trioxide Roasting of molybdenum also has a good effect. Whether it is for molybdenum trioxide or molybdenum dioxide, this scheme can increase the production capacity ratio of the rotary kiln and reduce energy consumption.

Description

A Rotary Kiln Molybdenum Oxide Roasting System Using Waste Heat to Supply Oxygen to the Bottom of Materials

technical field

The invention relates to the field of molybdenum oxide roasting, in particular to a rotary kiln molybdenum oxide roasting system which utilizes waste heat to supply oxygen to the bottom of materials.

Background technique

The existing molybdenum oxide roasting technology cannot realize the success of one-time roasting of molybdenum trioxide. After the initial roasting in the rotary kiln, there is a reverberatory furnace for secondary roasting, which increases the labor intensity, and there is a lot of dust in the operation process, causing pollution and Waste, low yield.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing molybdenum trioxide needs to be roasted multiple times due to the fact that the oxygen supply is located above the material and the oxygen cannot fully contact the material in the molybdenum oxide roasting technology, and to provide a rotary kiln that uses waste heat to supply oxygen to the bottom of the material Molybdenum oxide roasting system.

The present invention is for solving the deficiencies of the above-mentioned technical problems, and the technical scheme adopted is:

A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material, including a rotary kiln. A section of sealed hot air passage is arranged on the side wall of the rotary kiln. Usually, the rotary kiln includes an insulation layer, a replacement The thermal layer and the refractory layer generally form a heat exchange channel between the thermal insulation layer and the refractory layer, and the tail of the heat exchange channel leads into the rotary kiln, while the hot air channel in this application changes the traditional structure and the two ends of the traditional hot air channel All are sealed so that the hot air does not enter the rotary kiln from the end of the rotary kiln. One end of the rotary kiln is equipped with a hot blast stove and a kiln head box, and the other end is equipped with a rotary kiln feeding system and a heat exchange kiln tail box. The feeding system is generally It includes a rotary kiln feeder and a feeding system to ensure continuous feeding. The tail box of the heat exchange kiln is connected to the waste heat utilization system. One end of the hot air channel is connected to the waste heat utilization system, and the other end is connected to The hot air in the hot air channel is passed directly below the material in the rotary kiln, and at least one oxygen supply device at the bottom of the material can be installed, and multiple ones can be installed, and its position can be fixed at the end of the rotary kiln, or it can be installed other body positions.

The bottom oxygen supply device includes an annular bellows and an air guiding device. The annular bellows include an inner wall made of acid and alkali-resistant high-temperature-resistant breathable polymer film, an insulation layer and a baffle set on the outer side of the inner wall at intervals, and the heat-exchanged The temperature of high-temperature gas is generally 400-550°C. Therefore, the inner wall of the annular bellows is made of acid and alkali-resistant, high-temperature, and breathable polymer film. The polymer film can withstand high temperatures of 1000°C. It will not penetrate into the annular bellows through the polymer membrane. The baffles are arranged at both ends of the inner wall to cooperate with the inner wall and the insulation layer to form the inner cavity of the annular bellows, and the inner cavity of the annular bellows is provided with a plurality of partitions distributed along the axial direction of the annular bellows to separate the inner cavity of the annular bellows into several Axial and mutually isolated cavity, the annular bellows are fixed on the rotary kiln to form an integrated structure, the space surrounded by the inner wall of the annular bellows constitutes a part of the inner cavity of the rotary kiln, and the air guide device is fixed at the joint surface of the annular bellows and the rotary kiln , the air guide device includes a fixed cover, a sealing ring and a rotating support. The fixed cover is supported on the installation plane through the rotating support and realizes a sliding seal with the outer wall of the rotary kiln. The sealing ring is arranged on both sides of the fixed cover to cooperate with the fixed cover and the outer wall of the rotary kiln. The air guide channel is formed. The annular bellows is provided with a plurality of channels communicating with its inner cavity. The side of the fixed cover in contact with the sealing ring is provided with a C-shaped groove. The C-shaped groove is located directly below the material. The sealing ring is provided with several The hot air in the passage passes through the C-shaped groove and enters the passage through the vent, and the passage passes the hot air into the annular bellows and directly below the material.

The waste heat utilization system includes a main fan, a dust collector, an adjustable radiator and a settling heat exchanger connected in sequence; the settling heat exchanger is connected to the tail box of the heat exchange kiln through a flue gas pipeline, and the tail box of the heat exchange kiln The heat exchange air pipeline and the oxygen-enriched blower cooperate to communicate with the hot air channel, and a rotary seal is arranged at the entrance of the hot air channel.

The fixed cover is provided with an opening directly above the material, and the opening communicates with at least one vent on the sealing ring, and the vent communicates with the annular bellows through a channel to blow off the top material.

The angle formed between the two ends of the arc of the center line of the C-shaped groove and the line connecting the center of the circle where it is located is 30-180°, the length is related to the size of the rotary kiln, and the included angle is generally kept at 45-90°, Usually the reference standard is not less than the length of the material on the circumference of the rotary kiln.

The beneficial effects of the present invention are: in the present invention, the bottom material oxygen supply device is adopted, and the hot air after heat exchange is directly introduced to the bottom of the material. Since the rotary kiln is always rotating, the material will be continuously thrown on the bottom of the material during the rotation process. On the arc surface of the lower part of the rotary kiln's rotation center, an annular air box is set to cooperate with the air guide device to ensure that the circulating hot air is always located directly below the material during the rotation process, ensuring the continuous supply of oxygen. It will be thrown down continuously and the continuous supply of circulating hot air can ensure that the oxygen and the material are fully mixed, making the roasting effect more perfect. Therefore, the effect of firing molybdenum trioxide is particularly good, and it can be completed in one roasting, avoiding repeated roasting. Inconvenience, and this application has changed the structure from the perspective of roasting, so it also has a good effect on the roasting of molybdenum dioxide. No matter for molybdenum trioxide and molybdenum dioxide, the use of this scheme can improve the rotary kiln. The production capacity ratio reduces energy consumption.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a partially enlarged schematic diagram of the location B in Fig. 1 in the present invention.

Fig. 3 is a schematic diagram of an installation state of the bottom oxygen supply device in the present invention.

Fig. 4 is a sectional view along A-A direction in Fig. 3 in the present invention.

Icon marks: 1, hot blast stove; 2, kiln head box; 3, bottom oxygen supply device; 301, fixed cover; 3011, C-shaped groove; 302, sealing ring; 3021, vent; 303, rotating support; 304, Insulation layer; 305, annular bellows; 306, inner wall; 307, baffle; 4, rotary kiln; 5, main fan; 6, dust collector; 7, adjustable radiator; 8, settlement heat exchanger; 9, smoke Gas pipeline; 10. Heat exchange kiln tail box; 11. Feeding system; 12. Heat exchange air pipeline; 13. Oxygen-enriched fan; 14. Rotary seal; 15. Rotary kiln transmission device; 16. Rotary kiln support device .

detailed description

As shown in the figure, the specific implementation method is as follows:

A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material, including a rotary kiln 4, a section of sealed hot air passage is arranged on the side wall of the rotary kiln 4, and a hot air stove 1 and a kiln head box are arranged at one end of the rotary kiln 2. The other end is equipped with a rotary kiln feeding system 11 and a heat exchange kiln tail box 10. The heat exchange kiln tail box 10 is connected to the waste heat utilization system. One end of the hot air channel is connected to the waste heat utilization system, and the other end passes through the material The bottom oxygen supply device 3 passes the hot air in the hot air channel directly below the material in the rotary kiln 4 .

The bottom oxygen supply device 3 includes an annular bellows 305 and an air guiding device. The annular bellows 305 includes an inner wall 306 made of an acid, alkali, high temperature, and breathable polymer film, an insulating layer 304 and a shielding layer that are sheathed on the outside of the inner wall 306 at intervals. Plate 307, the baffle plate 307 is arranged at the two ends of the inner wall 306 to cooperate with the inner wall 306 and the insulating layer 304 to form the inner cavity of the annular bellows 305, and the inner cavity of the annular bellows 305 is provided with a plurality of partitions distributed along the axial direction of the annular bellows 305 to The inner cavity of the annular bellows 305 is separated into multiple cavities along its axial direction and mutually isolated. The annular bellows 305 is fixed on the rotary kiln 4 to form an integrated structure. The space surrounded by the inner wall of the annular bellows 305 constitutes a part of the inner cavity of the rotary kiln 4. , the air guide device is fixed at the joint surface of the annular wind box 305 and the rotary kiln 4, the air guide device includes a fixed cover 301, a sealing ring 302 and a rotating support 303, the fixed cover 301 is supported on the installation plane by the rotating support 303 and is connected with the rotary kiln 4. The outer wall realizes the sliding seal. The sealing ring 302 is arranged on both sides of the fixed cover 301 to cooperate with the fixed cover 301 and the outer wall of the rotary kiln 4 to form an air guide channel. There is a C-shaped groove 3011 on the contact side, and the C-shaped groove 3011 is located directly below the material. There are a number of equally spaced ventilation openings 3021 on the sealing ring, and the hot air in the channel passes through the C-shaped groove 3011 to pass through the ventilation Port 3021 enters the channel, and the channel passes hot air into the annular air box 305 and directly below the material.

The waste heat utilization system includes a main fan 5, a dust collector 6, an adjustable radiator 7 and a settling heat exchanger 8 connected in sequence; the settling heat exchanger 8 is connected to the heat exchange kiln tail box 10 through a flue gas pipeline 9 , the heat exchange kiln tail box 10 communicates with the hot air passage through the cooperation of the heat exchange air pipeline 12 and the oxygen-enriched blower 13, and a rotary seal 14 is arranged at the entrance of the hot air passage.

The fixed cover 301 is provided with an opening directly above the material, and the opening communicates with at least one vent on the sealing ring 302, and the vent communicates with the annular bellows 305 through a channel to blow off the top material.

The included angle between the two ends of the arc of the central line of the C-shaped groove 3011 and the line connecting the center of the circle where it is located is 60°.

The technical solutions and implementation methods listed in the present invention are not limiting, and solutions that are equivalent to or have the same effect as the technical solutions and implementation methods listed in the present invention are within the protection scope of the present invention.

Claims (5)

1. A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material, including a rotary kiln (4), a section of sealed hot air passage is set on the side wall of the rotary kiln (4), and a hot air channel is set at one end of the rotary kiln Furnace (1) and kiln head box (2), the other end is provided with a rotary kiln feeding system (11) and a heat exchange kiln tail box (10), and the heat exchange kiln tail box (10) is connected with the waste heat utilization system, and its characteristics That is: one end of the hot air channel is connected to the waste heat utilization system, and the other end passes the hot air in the hot air channel directly below the material in the rotary kiln (4) through the oxygen supply device (3) at the bottom of the material. 2. A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material according to claim 1, characterized in that: the oxygen supply device (3) for the bottom of the material includes an annular air box (305) and a guide The wind device, the annular bellows (305) includes an inner wall (306) made of an acid, alkali, high temperature, and breathable polymer film, an insulation layer (304) and a baffle (307) that are spaced outside the inner wall (306), and the baffle The plate (307) is arranged at both ends of the inner wall (306) to cooperate with the inner wall (306) and the insulation layer (304) to form the inner cavity of the annular bellows (305), and the inner cavity of the annular bellows (305) is provided with a plurality of annular bellows (305) Axially distributed partitions separate the inner cavity of the annular bellows (305) into multiple cavities that are isolated from each other along its axial direction. The annular bellows (305) are fixed on the rotary kiln (4) to form an integrated structure. The space surrounded by the inner wall of the wind box (305) constitutes a part of the inner cavity of the rotary kiln (4), and the air guiding device is fixed on the joint surface of the annular wind box (305) and the rotary kiln (4), and the air guiding device includes a fixed cover (301 ), the sealing ring (302) and the rotating support (303), the fixed cover (301) is supported on the installation plane by the rotating support (303) and realizes a sliding seal with the outer wall of the rotary kiln (4), and the sealing ring (302) is set on Both sides of the fixed cover (301) cooperate with the fixed cover (301) and the outer wall of the rotary kiln (4) to form an air guide channel. 302) There is a C-shaped groove (3011) on the contacting side, and the C-shaped groove (3011) is located directly below the material, and a number of equally spaced ventilation holes (3021) are arranged on the sealing ring, and the hot air in the channel Pass through the C-shaped groove and enter the passage through the vent (3021), and the passage passes hot air into the annular air box (305) and directly below the material. 3. A rotary kiln molybdenum oxide roasting system that uses waste heat to supply oxygen to the bottom of the material according to claim 1, characterized in that: the waste heat utilization system includes a main fan (5), a dust collector ( 6), adjustable radiator (7) and settling heat exchanger (8); the settling heat exchanger (8) is connected to the heat exchange kiln tail box (10) through the flue gas pipeline (9), and the heat exchange kiln tail box (10) It communicates with the hot air passage through the cooperation of the heat exchange air pipeline (12) and the oxygen-enriched fan (13), and a rotary seal (14) is provided at the entrance of the hot air passage. 4. A rotary kiln molybdenum oxide roasting system that utilizes waste heat bottom to supply oxygen to materials according to claim 1, characterized in that: the fixed cover (301) is provided with an opening directly above the materials, and the opening is connected with At least one vent on the sealing ring (302) communicates, and the vent is communicated with the annular bellows (305) through a passage to blow off the top materials. 5. A rotary kiln molybdenum oxide roasting system using waste heat bottom oxygen supply according to claim 1, characterized in that: the two ends of the arc of the center line of the C-shaped groove and the line connecting the center of the circle where it is located The included angle is 30-180°.