CN203657355U - Fluidized drying equipment used for mechanically scattering coal slime - Google Patents

Abstract

The utility model relates to a mechanically dispersed fluidized drying equipment for coal slime. The equipment involved includes: a drying box, which is equipped with a material inlet, a material outlet, a gas outlet and a flue gas inlet; a stirring shaft for breaking up the coal slime to be dried, which is installed in the drying box The bottom is located above the flue gas inlet; after the dried coal slime enters the drying box through the feed port, it is broken up into coal slime particles by the stirring shaft, and at the same time, the hot flue gas enters from the flue gas inlet at the bottom of the drying box at a suitable flow rate. , the coal slime particles are fluidized and dried and discharged from the gas outlet, and at the same time, the dried coal slime is output from the discharge port. The equipment has a large contact area between gas and solid drying, long drying time, high heat utilization rate, large output and small footprint.

Description

A mechanically dispersed fluidized drying equipment for coal slime

technical field

The utility model relates to a coal slime drying technology, in particular to a mechanically dispersed fluidized drying equipment for coal slime. the

Background technique

At present, there are many domestic drying processes and equipment. In the field of coal slime drying in the coal industry, there are three main categories: coal slime drum drying process, tunnel drying process (including flap dryer and mesh belt dryer) and airflow drying process. the

(1) Drum drying process

Drum dryer is one of the earliest drying equipment. It is not only used for drying coal, but also widely used in metallurgy, building materials, chemical industry and other fields. The main body of the drum dryer is a cylinder with an inclination (0-5°) and can be rotated. The wet material is fed from the upper part of one side, and the hot drying medium (hot air, flue gas) flows through it concurrently. The slow rotation of the cylinder moves from the higher end to the lower end under the action of gravity. The inner wall of the cylinder is equipped with a forward lifting plate, which continuously lifts and drops the material, so that the thermal contact area of the material increases, so that Improve the thermal efficiency of drying and promote the forward movement of materials. The exhaust gas is discharged after being treated by the dust collector. the

The characteristics of the drum dryer are: large production capacity, continuous production; simple structure, convenient operation, low failure rate; wide application range, large operating flexibility. the

The flue gas temperature of the drum dryer is above 500°C, which is easily higher than the ignition point of coal. The thermal efficiency is low, and the viscous material is easy to stick to the inner wall of the drum. When drying the viscous material, it is easy to block the drum and affect the normal work. the

(2) Tunnel drying process

The tunnel drying process is suitable for drying block and strip materials. There are flap dryers and metal mesh belt dryers. After the slime is extruded into strips, it can be dried on the metal mesh belt dryer. the

The working process is as follows: the wet material enters from one end of the tunnel kiln, spreads a material layer with uniform thickness on the rotating conveyor belt, and moves with the conveyor belt (the wet material and the conveyor belt are relatively stationary), and the hot flue gas flows from the top of the tunnel kiln. Or the bottom enters, passes through the material layer horizontally, and transfers heat to the material. The contact between the hot flue gas and the material can be one pass or multiple passes to improve the thermal efficiency. The material completes the drying and dehydration process while moving with the conveyor belt. the

When the coal slime is drying, there is a extrusion feeding device on the feeding side, the main function is to squeeze the unshaped coal slime into regular strips and rods, and then spread it evenly on the chain flap conveyor belt (is An intermittent conveyor belt with mesh holes on the flaps), by adjusting the conveying speed of the conveyor belt, and passing hot air from the flue gas into the dryer, the hot air flows through and dries , There is a scraper discharge device at the bottom of the dryer, so as to realize the drying of coal slime. the

Since the drying of coal slime is only to remove moisture, the temperature of the hot flue gas is high and the turning speed is fast (otherwise, the thermal efficiency is low), which will cause a high failure rate of the equipment. The processing capacity of the equipment is relatively small (generally about 10t/h); the effective through-flow drying stroke is short, and there is short-circuit wind, so the drying efficiency is low. the

The hot gas temperature of this type of drying process is also above 600°C, and the processing capacity of the equipment is too small and the cost is high. the

(3) Airflow drying process

The airflow drying process uses the heating medium (hot air, flue gas, etc.) to directly contact the wet material particles, and suspends the solid particles in the heating medium fluid, which strengthens the mass transfer and heat transfer process. Applied to the drying of bulk materials, such as pellets or powder. the

But for viscous materials, airflow drying cannot be used directly. the

In summary, the existing coal slime drying technology has the disadvantages of low heat utilization rate, high equipment cost and weak applicability. the

Contents of the invention

Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a mechanically dispersed fluidized drying equipment for coal slime. the

For this reason, the equipment provided by the utility model includes:

A drying box, which is provided with a material inlet, a material outlet, a gas outlet and a flue gas inlet;

Stirring shaft, installed at the bottom of the drying box and above the flue gas inlet, is used to break up the coal slime to be dried;

After the dried coal slime enters the drying box through the feed port, it is broken up by the stirring shaft into coal slime particles. At the same time, the hot flue gas enters from the flue gas inlet at the bottom of the drying box at a suitable flow rate to flow the coal slime particles. After state drying, it is discharged from the gas outlet, and at the same time, the dried coal slime is output from the discharge port. the

Preferably, the bottom of the drying box is sequentially installed with at least one partition along the feeding direction to divide the drying box into multiple drying areas, and the bottom of each drying area is provided with a stirring shaft and a flue gas inlet. The at least one partition The height of the plate decreases gradually along the feeding direction. the

Preferably, the bottom of the drying box is sequentially installed with at least two partitions along the feeding direction to divide the drying box into multiple drying areas, and the bottom of each drying area is provided with a stirring shaft and a flue gas inlet, and the at least two The height of each partition gradually decreases along the feeding direction. the

Preferably, a first partition, a second partition and a third partition are sequentially installed in the bottom of the drying box along the feeding direction, and the three partitions divide the drying box into a first drying area, a second drying area, and a second drying area. The drying zone and the third drying zone, the coal slime to be dried first enters the first drying zone through the feed port, and is broken into coal slime particles by the stirring shaft of the first drying zone, and the hot flue gas is blown with a suitable The flow rate enters from the flue gas inlet at the bottom of the first drying zone to fluidize and dry the coal slime particles, and then the coal slime particles are sequentially transported by airflow to the second drying zone and the third drying zone for drying. the

Preferably, the first partition is 0.5-1.0m higher than the stirring shaft of the first drying zone, the second partition is 0.3-0.8m higher than the stirring shaft of the second drying zone, and the third partition is The plate is 0.2-0.6m higher than the stirring shaft of the third drying zone. the

Compared with the existing technology,

The equipment of the utility model has a large drying contact area between gas and materials, a long drying time, a high heat value utilization rate, a high output, stable operation of the equipment, and a high degree of continuous operation. Because the material is thrown up repeatedly in the machine cavity, the airflow fully contacts with the material, so the contact area between gas and solid is large, the contact time is long, the heat transfer rate is fast, and the dry and uniform product can be obtained. the

The equipment of the utility model adopts mechanical force to disperse, and the particle size of the material is not limited. There is no phenomenon of material agglomeration, channeling, short circuit, etc. It is not only suitable for materials with light specific gravity and uniform particles, but also suitable for mixed materials with heavy specific gravity and uneven particles. It is more suitable for large output and a certain amount of residue is allowed. Moisture material is dry. the

The horizontal structure of the equipment of the utility model has small footprint, large processing capacity per unit volume, high drying strength, high heat transfer rate and high thermal efficiency, and the volume heat transfer coefficient is the highest among all kinds of dryers. Up to 5000～10000W/(M ³ .℃), thermal efficiency greater than 50%.

In the equipment of the utility model, the heights of the plurality of partitions decrease successively along the feeding direction, which can effectively avoid material blockage and ensure smooth feeding in the drying box. the

The height of each partition in the equipment of the utility model is equivalent to the thickness of the material layer in each drying zone in the drying process, and adopting a suitable partition height can simultaneously ensure a high utilization rate of the calorific value of the equipment and smooth feeding. the

Description of drawings

The technical solution of the utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. the

Fig. 1 is the structural reference schematic diagram of the mechanical dispersion fluidized drying equipment of coal slime of embodiment;

Fig. 2 is a reference schematic diagram of the overall structure of the device of the embodiment. the

Detailed ways

When using the equipment of the utility model to dry the coal slime, the coal slime to be dried is dispersed into coal slime particles, and at the same time, the hot flue gas is used to fluidize the coal slime particles, wherein the particle size of the coal slime particles is not larger than 10 mm, the flow rate of the hot flue gas and the mass ratio of the coal slime to be dried are: 50-200 standard cubic meters per ton, and the temperature of the hot flue gas is 400-500°C. The preferred process is: the temperature of the first drying zone is: 350-450 degrees, the temperature of the second drying zone is: 250-350 degrees, the temperature of the third drying zone is: 120-250 degrees, the bottom of the first drying zone The velocity of the hot flue gas at the section is: 2-5 m/s, the rotation speed of the stirring shaft in the first drying zone is: 200-400 rpm, and the coal slime to be dried stays in the drying box for 15-40 minutes. the

Example:

This embodiment provides a set of integral coal slime drying equipment utilizing the mechanically dispersed fluidized drying equipment for coal slime of the utility model. the

With reference to Fig. 2, the drying device of this embodiment comprises coal slime feeding scraper 19, coal slime silo 18, the machinery of coal slime breaks up fluidized drying equipment 14, hot blast stove 22, finished product storehouse 21, cyclone dust collector 17 , Bag filter 16, tail gas chimney 15, dry product conveyor 20. the

The coal slime 23 to be dried with a water content of 15%-30% is transported into the mechanically dispersed fluidized drying equipment 14 of the coal slime through the slime feeding scraper 19 and the coal slime silo 18, and the dried product is passed through the coal slime The discharge port 6 of the mechanically dispersed fluidized drying equipment 14 is directly transported into the finished product warehouse 21, and some small particles of coal slime pass through the gas outlet 5 in turn through the cyclone dust collector 17 and the bag filter 16, and then pass through the finished product conveyor 20. Transported into the finished product warehouse 20; during the process, the hot blast stove 22 transports the hot flue gas to the mechanically dispersed fluidized drying equipment 14 of the coal slime through the flue gas inlets (41, 42, 43). the

As shown in Figure 1, this is the mechanical dispersion fluidized drying equipment 14 of the coal slime of embodiment and comprises drying cabinet 1 and the stirring shaft 2 that is installed in drying cabinet 1 bottom, is provided with feeding material on drying cabinet 1 Port 3, material outlet 6, gas outlet 5, flue gas inlet (41, 42, 43), explosion-proof opening 13 and manhole door 11; wherein the material inlet 3 is equipped with a coal slime feeding reamer 12, and the material outlet 6 is equipped with a dry pellet discharge air locker 8;

The bottom of the drying box 1 is sequentially installed with a first partition 7, a second partition 8 and a third partition 9 along the feeding direction, and the three partitions divide the drying box 1 into a first drying area, a second In the second drying zone and the third drying zone, the coal slime to be dried first enters the first drying zone from the feed port 3 and is broken up into coal slime particles by the stirring shaft 2 of the first drying zone, and the hot flue gas flows with a suitable The flow rate enters from the flue gas inlet at the bottom of the first drying zone to fluidize the coal slime particles, and then the coal slime particles are transported by the airflow to the second drying zone and the third drying zone for drying, so that the coal slime particles After fluidized drying, the pellets are discharged from the gas outlet, and at the same time, the dried coal slime is output from the discharge port. Among them: the first partition is 0.7m higher than the stirring shaft of the first drying zone, the second partition is 0.5m higher than the stirring shaft of the second drying zone, and the third partition is higher than the stirring shaft of the third drying zone 0.4m. the

The wet material passes through the screw feeding reamer from one end of the dryer. After the material enters the drying box, it is thrown up and scattered by the lifting teeth on the stirring shaft, and the hot smoke is sucked into the dryer from the bottom of the drying box by the induced draft fan. The dispersed coal slime particles are fluidized and dried, and the dried coal slime particles are conveyed by the induced draft fan to the dry pellet discharge air locker 8 to discharge the materials, and a small part of the fine particle materials enter the dust collector with the air flow, and the dust collector is separated The output material is recycled as a product, and the exhaust gas is discharged through the exhaust fan. The mechanical dispersion fluidization drying process can process powdery or lumpy wet materials mixed with materials of different particle sizes. the

During the process, the flow rate of the hot flue gas and the mass ratio of the coal slime to be dried are controlled to be 50-200 standard cubic meters per ton, and the flow rate of the hot flue gas at the bottom section of the first drying zone is 2-5 m/s. The rotating speed of the stirring shaft is: 200-400 rpm, the temperature of the first drying zone is: 350-450 degrees, the temperature of the second drying zone is: 250-350 degrees, and the temperature of the third drying zone is : 120-250 degrees. the

The device is equipped with a cyclone dust collector and a bag filter, and the dust concentration of the exhaust gas is low, meeting the emission standards of air pollutants. the

An explosion-proof door is installed on the top of the dryer, and the manhole doors on other floors are all designed as manhole doors with the function of explosion-proof doors. the

Claims (5)

1. A mechanically dispersed fluidized drying equipment for coal slime, characterized in that the equipment comprises: A drying box, which is provided with a material inlet, a material outlet, a gas outlet and a flue gas inlet; The stirring shaft, installed at the bottom of the drying box and above the flue gas inlet, is used to break up the coal slime to be dried; after the dried coal slime enters the drying box through the feed port, it is broken into coal slime particles by the stirring shaft, and at the same time The hot flue gas enters from the flue gas inlet at the bottom of the drying box at a suitable flow rate, and the coal slime particles are fluidized and dried and then discharged from the gas outlet. At the same time, the dried coal slime is output from the discharge port. the 2. The mechanical dispersion fluidized drying equipment of coal slime as claimed in claim 1 is characterized in that, at least one partition is installed successively along the feeding direction at the bottom of the drying box to separate the drying box into a plurality of In the drying zone, a stirring shaft and a flue gas inlet are arranged at the bottom of each drying zone, and the height of the at least one partition gradually decreases along the feeding direction. the 3. the machinery of coal slime as claimed in claim 1 breaks up the fluidized drying equipment, is characterized in that, described drying cabinet bottom is successively installed with at least two dividing plates along the feeding direction to separate the drying cabinet into multiple parts. There are three drying areas, each drying area is provided with a stirring shaft and a flue gas inlet at the bottom, and the height of the at least two partitions gradually decreases along the feeding direction. the 4. The mechanical dispersion fluidized drying equipment of coal slime as claimed in claim 3 is characterized in that, the first dividing plate, the second dividing plate and the second dividing plate are successively installed in the bottom of the drying box along the feeding direction. Three partitions, the three partitions divide the drying box into the first drying area, the second drying area and the third drying area, and the coal slime to be dried first enters the first drying area through the feed port and is then dried by the second drying area. The stirring shaft in the first drying zone breaks up the coal slime particles, and at the same time, the hot flue gas enters from the flue gas inlet at the bottom of the first drying zone at a suitable flow rate to fluidize and dry the coal slime particles, and then the coal slime particles are sequentially It is transported into the second drying zone and the third drying zone by airflow for drying. the 5. The machinery of coal slime as claimed in claim 4 breaks up the fluidized drying equipment, it is characterized in that, the stirring shaft of the first partition is higher than the first drying zone by 0.5-1.0m, and the second The partition is 0.3-0.8m higher than the stirring shaft of the second drying zone, and the third partition is 0.2-0.6m higher than the stirring shaft of the third drying zone. the

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