CN105066606A - Waste heat drying rotary kiln - Google Patents

Abstract

The invention discloses a rotary kiln for tail heat drying, which comprises a rotary kiln body, the rotary kiln is arranged obliquely, and has a built-in burner. There is a conveyor belt connected to the discharge pipe inside, and an air lock is installed at the other end of the dryer; a raised refractory board is installed inside the rotary kiln. The raised refractory plate of the present invention increases the heat transfer area of the rotary kiln, promotes the turning of the material, is conducive to quickly reaching the reaction temperature, and improves the thermal efficiency; the dryer realizes the utilization of tail heat, which is beneficial to the forming and drying of spherical materials; The use of heat preservation and follow-up reaction with hot materials has the characteristics of significant energy saving. The quenching liquid pool rapidly cools the pellets, and the reaction can evaporate a large amount of water, which can effectively relieve the environmental protection pressure of the expansion of the production liquid.

Description

A rotary kiln for tail heat drying

technical field

The invention relates to a rotary kiln, in particular to a rotary kiln for tail heat drying.

Background technique

Due to its strong adaptability, low operating cost and high reliability, the rotary kiln is one of the main preferred equipment for mineral batching, pelletizing, reaction and drying, and is especially suitable for the processing and burning of vanadium ore. During the working process, the rotary kiln needs to consume fuel to maintain a suitable high temperature in the kiln. Therefore, the exhaust gas discharged from the rotary kiln contains a lot of heat energy and dust. It is necessary to purify the exhaust gas and recover the exhaust heat to achieve energy saving and emission reduction.

The rotary kiln is generally cylindrical, so the heat transfer area between the material and the kiln body is very small, resulting in low thermal efficiency. Therefore, designing a rotary kiln with high thermal efficiency, good exhaust heat recovery and dust removal effects, smooth material entry and exit, and a high degree of continuity is of great significance for energy saving, emission reduction, and work efficiency improvement.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a rotary kiln with simple and practical structure, high thermal efficiency, good exhaust heat recovery and dust removal effect, smooth material in and out and high degree of continuity.

In order to overcome the deficiencies in the prior art, the present invention takes the following technical solutions:

A rotary kiln for tail heat drying, including a rotary kiln, characterized in that: the rotary kiln is arranged obliquely, with a built-in burner, and the high end of the rotary kiln is connected to one end of the dryer in two directions through a drop pipe and an air pipe. There is a conveyor belt connected to the discharge pipe, and an air lock is installed at the other end of the dryer; a raised refractory board is installed inside the rotary kiln.

The burner is connected with an air control valve and a fuel control valve.

The dryer is equipped with a fan, which is beneficial to the drying of materials.

The air locker is connected into a ball disk, and the ball disk is connected to the mixer.

The lower end of the rotary kiln is connected to the heat preservation reaction barrel, and the heat preservation reaction barrel is connected to the quenching liquid pool, and a discharge belt is arranged in the quench liquid pool, and the discharge belt is supported by rollers.

The dryer is connected to the induced draft fan through the cyclone dust collector, the exhaust port of the induced draft fan is connected to the bag filter, the lower part of the cyclone dust collector is connected to the air locker, and a dust collection bucket is arranged under the air locker.

The raised fire-resistant plate is trapezoidal or rectangular or triangular.

The rotary kiln is the core component of the system. The general structure is to fix the refractory insulation layer in the steel cylinder. In this design, the raised refractory plates can be combined in various forms such as continuous, intermittent, long and short, and evenly distributed to form a solid steel cylinder. Overall refractory material.

The burner is arranged in the rotary kiln, and the burner is connected to the air control valve and the fuel control valve. The fuel can be coal gas or compressed air transported in, and the burner is sprayed and burned in the burner.

Mineral powder is mixed evenly in the mixer, and the output is granulated in the pelletizing disc, and enters the dryer through the air locker. The material in the dryer is conveyed from left to right through the conveyor belt, and the exhaust gas from right to left The fan can strengthen the air flow to penetrate the material and enhance the effect of drying and preheating. The drop tube can drop the preheated spherical material into the rotary kiln, and the air pipe realizes the air flow; the gas in the rotary kiln The middle is moving from left to right, and the material is moving from right to left to form a countercurrent heat exchange to achieve high temperature treatment.

The rotary kiln has an appropriate inclination angle and controls the rotation at a certain speed. The material can move from the high end to the low end in a controlled manner, and at the same time complete the reaction operation. The raised refractory plate can manipulate the material, promote the material turning, and greatly increase the flame heating area. It is beneficial to quickly reach the reaction temperature and improve efficiency.

After the high-temperature reaction of the spherical material, it is output to the low end, enters the thermal insulation reaction tank, and continues to carry out the follow-up reaction at high temperature with waste heat. There is a discharge belt in the quenching liquid pool, and the reaction liquid can be used in the quenching pool. The movement of the discharge belt is controlled to output from the bottom of the thermal insulation reaction tank into the quenching liquid pool. The idler roller can effectively improve the carrying capacity of the discharge belt, and the output of the solid-liquid mixture in the tank can enter the next step of processing.

The exhaust gas passes through the dryer and is output from the left end to the cyclone separator to complete the dust removal and output. The central pipe outputs the dust removal gas to connect to the induced draft fan, and the outlet of the induced draft fan is connected to the bag filter to realize the secondary dust removal.

Compared with prior art, the beneficial effect of the present invention also lies in:

The raised refractory plate increases the heat transfer area of the rotary kiln, promotes the turning of the material, is conducive to quickly reaching the reaction temperature, and improves the thermal efficiency; the dryer realizes the utilization of tail heat, which is conducive to the forming and drying of spherical materials; the utilization of tail heat and The follow-up reaction of hot material insulation has the characteristics of significant energy saving. The quenching liquid pool rapidly cools the ball material, and the reaction can evaporate a large amount of water, which can effectively relieve the environmental protection pressure of the expansion of the production liquid. It is especially suitable for the burning process of vanadium ore, and has broad application prospects.

Description of drawings

Fig. 1 is a schematic plan view of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of a rotary kiln.

Each label in the figure means:

A. Induced fan; 1. Rotary kiln; 2. Thermal insulation reaction barrel; 3. Discharge belt; 4. Quenching liquid pool; 5. Raised refractory plate (trapezoidal); 6. Burner; 7. Flame; 8. Cyclone dust collector; 9. Air duct; 10. Bag filter; 11. Air locker; 12. Ball disc; 13. Mixer; 14. Conveyor belt; 15. Fan; 16. Dryer; 17. Air pipe; 18, drop pipe; 19, air control valve; 20, fuel control valve; 21, spherical material; 22, idler roller; 23, dust collection bucket.

Detailed ways

Now in conjunction with accompanying drawing, the present invention is described in further detail.

The rotary kiln for exhaust heat drying shown in Figure 1 and Figure 2 includes a rotary kiln 1, which is arranged obliquely and has a built-in burner 6. The pipe 17 is bidirectionally connected, the dryer 16 is provided with a conveyer belt 14 connected to the drop pipe 18, and the other end of the dryer 16 is provided with an air lock 11; the rotary kiln 1 is provided with a raised refractory board 5.

The burner 6 is connected with an air control valve 19 and a fuel control valve 20 .

The dryer 16 is provided with a fan 15, which is beneficial to the drying of materials.

The air locker 11 is connected into a spherical disc 12, and the spherical disc 12 is connected with a mixer 13.

The lower end of the rotary kiln 1 is connected to the heat preservation reaction barrel 2, and the heat preservation reaction barrel 2 is connected to the quenching liquid pool 4, and a discharge belt 3 is arranged in the quench liquid pool 4, and the discharge belt 3 is supported 22 by rollers.

The dryer 16 is connected to the induced draft fan A through the cyclone dust collector 8, the exhaust port of the induced draft fan A is connected to the bag filter 10, the lower side of the cyclone dust collector 8 is connected to the air locker 11, and a dust collection bucket is arranged below the air locker 11 twenty three.

The raised fire-resistant plate is trapezoidal or rectangular or triangular.

The rotary kiln 1 is the core component of the system. The general structure is to fix the refractory insulation layer in the steel cylinder. In this design, the raised refractory board 5 can be combined in various forms such as continuous, intermittent, long and short, and evenly distributed to form a solid steel The whole refractory material in the cylinder.

A burner 6 is arranged in the rotary kiln 1 , and the burner 6 is connected to an air control valve 19 and a fuel control valve 20 .

Mineral powder is mixed evenly in the mixer 13, and the output is granulated in the pelletizing disc 12, and enters the dryer 16 through the air locker 11, and the material in the dryer is conveyed from left to right through the conveyor belt 14, and is separated from the The right-to-left exhaust air flow performs countercurrent drying and preheating treatment. The fan 15 can strengthen the air flow to penetrate the material and enhance the drying and preheating effect. The drop pipe 18 can drop the preheated spherical material 21 into the rotary kiln 1. Realize 17 air flow conduction; the gas moves from left to right in the rotary kiln 1, and the material moves from right to left to form a countercurrent heat exchange to realize high temperature treatment.

The rotary kiln 1 has an appropriate inclination angle, controls the rotation at a certain speed, and the material can move from the high end to the low end in a controlled manner, and at the same time complete the reaction operation. The raised refractory plate 5 can handle the material, promote the turning of the material, and greatly increase the flame heating area , which is conducive to quickly reaching the reaction temperature and improving efficiency.

After the high-temperature reaction of the spherical material 21, it is output to the low end, enters the heat preservation reaction tank 2, and continues to carry out the follow-up reaction at high temperature with residual heat. A discharge belt 3 is arranged in the quenching liquid pool 4. The reaction liquid can be used in the quenching pool 4, and the spherical material is rapidly Cooling and reaction, by controlling the movement of the discharge belt 3, output from the bottom of the heat preservation reaction tank 2 into the quenching liquid pool 4, the idler 22 can effectively improve the carrying capacity of the discharge belt 3, and the output of the solid-liquid mixture in the pool can enter the lower step processing.

The tail gas passes through the dryer 16 and is output from the left end to the cyclone separator 8 to complete dust removal and output. The dust removal gas output from the central pipe is connected to the induced draft fan A, and the outlet of the induced draft fan A is connected to the bag filter 10 to realize secondary dust removal.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (7)

1. A rotary kiln for tail heat drying, including a rotary kiln, characterized in that: the rotary kiln is arranged obliquely, with a built-in burner, and the high end of the rotary kiln is connected to one end of the dryer in two directions through a drop pipe and an air pipe, and the drying There is a conveyor belt in the machine to connect the discharge pipe, and the other end of the dryer is equipped with an air lock; the rotary kiln is equipped with a raised refractory board. 2. The rotary kiln for exhaust heat drying according to claim 1, wherein the burner is connected with an air control valve and a fuel control valve. 3. The rotary kiln for exhaust heat drying according to claim 1, characterized in that: said dryer is provided with a fan, which is beneficial to the drying of materials. 4. The rotary kiln for exhaust heat drying according to claim 1, characterized in that: the air locker is connected to form a spherical disc, and the spherical disc is connected to a mixer. 5. The rotary kiln for tail heat drying according to claim 1, characterized in that: the low end of the rotary kiln is connected to the heat preservation reaction barrel, the heat preservation reaction barrel is connected to the quenching liquid pool, and a discharge belt is arranged in the quenching liquid pool, The discharge belt is supported by rollers. 6. The rotary kiln for tail heat drying according to claim 1, characterized in that: the dryer is connected to the induced draft fan through the cyclone dust collector, the exhaust port of the induced draft fan is connected to the bag filter, and the bottom of the cyclone dust collector is connected to a closed There is a dust collection bucket under the air locker. 7. The rotary kiln for exhaust heat drying according to claim 1, characterized in that: the raised refractory plate is trapezoidal or rectangular or triangular.