CN206269549U - A kind of low-order coal vibration separation drying equipment - Google Patents

Abstract

The utility model discloses a low-rank coal vibration grading drying equipment, which belongs to the technical field of drying equipment. Connecting shaft, large sieve plate, medium sieve plate, small sieve plate, suspension spring, discharge port, degassing and dust removal negative pressure device, gas-solid separator. Raw coal enters the box from the feed port and falls on the screen surface, where the screen surface is set at an inclination angle of 5°-15° and the hole diameter increases from the feed port to the discharge port, and vibrates under the action of the exciter. The raw coal above is mixed and classified. At the same time, the hot flue gas enters the inside of the box after passing through the air diffuser, and dries the raw coal of different particle sizes. The completely dried raw coal enters the discharge port after passing through the sieve, and the gas and dust enter the gas-solid Separator, so as to realize the graded drying of particles with different particle sizes, and avoid the problem of insufficient drying of coarse particles and excessive drying of fine particles.

Description

A low-rank coal vibration classification drying equipment

technical field

The utility model relates to a low-rank coal drying equipment method, in particular to a low-rank coal vibration classification drying equipment suitable for improving the combustion of low-rank coal in a boiler.

Background technique

Low-rank coal is cheap, but the water content is usually between 30% and 60%. When low-rank coal with high water content is burned in the boiler, 20% to 25% of the combustion heat is used to evaporate the moisture in the coal, resulting in low thermal efficiency of the boiler. In addition, coal with high water content will freeze due to low temperature during transportation. Therefore, in order to improve the utilization efficiency of low-rank coal and expand its application, various research institutions have devoted themselves to the research of low-rank coal drying equipment. Conventional drying equipment directly mixes low-rank coal with different particle sizes and drying gas at a certain temperature for drying. The particle size of rank coal varies greatly, and the drying time varies, which leads to insufficient drying of coarse particles, over-drying of fine particles and even pyrolysis, and causes system safety hazards.

Utility model content

Technical problem: The purpose of this utility model is to overcome the deficiencies in the prior art and provide a low-rank coal with simple structure, convenient operation, improved boiler thermal efficiency, low drying rate of low-rank coal, and uneven heating of samples. Vibration grading drying equipment.

Technical solution: In order to achieve the above purpose, the low-rank coal vibration classification drying equipment of the utility model includes a frame, a box body, a feed inlet, a hot flue gas inlet, an air diffuser, a vibrator, a motor, and a connecting shaft , sieve plate, suspension spring, discharge port, degassing and dust removal negative pressure device, gas-solid separator; Air inlet and air diffuser; there is a sieve plate fixed by suspension springs in the box, and a vibrator is installed in the middle space of the box above the sieve plate, and the vibrator is connected to the motor on the frame , the motor drives the exciter to generate an exciting force, and a connecting shaft is provided between the exciter and the sieve plate; the sieve plate is connected by a large sieve plate, a medium sieve plate and a small sieve plate It is formed; under different sieve plates, there are discharge ports for collecting dry raw coal of different particle sizes, and a degassing and dust removal negative pressure device is installed on one side of the discharge port. Gas and dust particles are preliminarily separated from dry raw coal and gas dust under the action of negative pressure, and then enter the gas-solid separator for treatment and then discharge.

The pore diameters of the large sieve plate, the medium sieve plate and the small sieve plate are respectively: 25mm, 13mm and 6mm.

The large sieve plate, the medium sieve plate and the small sieve plate are welded together. The inclination angle of different sieve plates is between 5° and 15°, and the inclination angle of the sieve plate is from the feeding port to the discharge The inclination angle of the mouth decreases.

The sieve plate with large sieve holes, the sieve plate with medium sieve holes and the sieve plate with small sieve holes are provided with slots of different heights for easy replacement of the sieve surface.

There are multiple hot flue gas inlets.

A filter screen is installed between the degassing and dust removal negative pressure device and the discharge port to avoid affecting the discharge of large particles of raw coal.

Beneficial effects, due to the adoption of the above technical scheme, the utility model dries the raw coal of low-rank coal, realizes continuous drying, improves drying efficiency, and avoids insufficient drying time due to high-temperature gas and coarse particles, and excessive drying time of fine particles. long-term problems. As the inclination angle of the screen surface decreases from the feed port to the discharge port, the movement of the particles gradually slows down, fully making the coarse particle raw materials contact with the hot flue gas, and ensuring the complete drying of the coarse particle raw materials. Low-rank coal vibration classification drying equipment that solves the problems of low drying rate of traditional low-rank coal and uneven heating of samples. Its main advantages are:

1. Under the action of the exciting force, the particles present a mixed flow state, and the full contact between the particles and the hot flue gas ensures the uniform heating of the particles, and the fine particles are discharged through different sieve holes, avoiding the overheating of the fine particles Drying, which improves the safety during the drying process;

2. Realize the continuity of feed during the drying process of low-rank coal, and classify the dried raw coal, increase the processing capacity of the equipment and improve the quality of raw coal at the same time;

3. There are multiple hot flue gas inlets on the top of the equipment box, so that the inlet temperature and flow rate of the flue gas can be adjusted according to the drying condition of the raw coal, so as to improve the utilization rate of energy and reduce the waste in the drying process. energy consumption;

4. The material flow velocity of low-rank coal in the box is mainly determined by the exciting force, the direction of the exciting force and the angle of the sieve plate. Therefore, the complete drying of coarse particles can be ensured by adjusting the material flow velocity.

Description of drawings

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

Fig. 2 is a schematic diagram of the sieve plate structure of the present invention.

In the figure: 1-frame; 2-box; 3-feed inlet; 4-hot gas inlet; 5-air diffuser; 6-vibrator; 7-motor; 8-connecting shaft; 9 - large sieve plate; 10 - medium sieve plate; 11 - small sieve plate; 12 - suspension spring; 13 - discharge port; 14 - degassing and dust removal negative pressure device; 15 - gas-solid separator.

detailed description

The utility model will be further described below in conjunction with the implementation examples in the accompanying drawings:

The low-rank coal vibration grading drying equipment of the utility model is mainly composed of a frame 1, a box body 2, a feed port 3, a hot flue gas inlet 4, an air diffuser 5, an exciter 6, a motor 7, and a connecting shaft 8. It consists of a sieve plate, a suspension spring 12, a discharge port 13, a degassing and dedusting negative pressure device 14, and a gas-solid separator 15; Raw coal feed port 3 for rank coal, hot flue gas inlet 4 and air diffuser 5; there are multiple hot flue gas inlets 4, 5 as shown in the figure, and the number can be determined according to needs. According to the condition of dry raw coal, the temperature of the hot flue gas passing through each hot flue gas inlet can be adjusted. The box body 2 is provided with a sieve plate fixed by a suspension spring 12, and an exciter 6 is arranged in the middle space of the box body 2 on the top of the sieve plate, and the exciter 6 is connected with the motor 7 arranged on the frame, and the motor 7 is driven by the motor 7 drives the exciter 6 to generate an exciting force, and a connecting shaft 8 is arranged between the exciter 6 and the sieve plate; The sieve plates 11 are welded, and the inclination angles of different sieve plates are between 5° and 15°, and the inclination angles of the sieve plates decrease gradually from the feed port to the discharge port. The apertures of the large sieve sieve 9, the middle sieve 10 and the small sieve 11 are respectively: 25mm, 13mm and 6mm, the large sieve 9, the middle sieve 10 and the small sieve The hole sieve plate 11 is provided with slots of different heights for easy replacement of the sieve surface. The discharge ports 13 for collecting dry raw coal of different particle sizes are arranged under the sieve plates of different sieve holes, and a degassing and dust removal negative pressure device 14 is installed on one side of the discharge port 13. The degassing and dust removal negative pressure device 14 is connected with the discharge port. A filter screen is installed between the material openings 13 to avoid affecting the discharge of large particles of raw coal. Gas and dust particles are preliminarily separated from dry raw coal and gas dust under negative pressure, and then enter the gas-solid separator 15 for treatment before being discharged.

Claims (6)

1. A low-rank coal vibration classification drying equipment, characterized in that it includes a frame (1), a box (2), a feed inlet (3), a hot flue gas inlet (4), and an air diffuser (5), vibrator (6), motor (7), connecting shaft (8), sieve plate, suspension spring (12), discharge port (13), degassing and dust removal negative pressure device (14), gas-solid Separator (15); the box (2) is set on the frame (1), and the upper part of the box (2) is successively provided with a low-rank coal raw coal inlet (3), a hot flue gas inlet ( 4) and the air diffuser (5); the box body (2) is provided with a sieve plate fixed by a suspension spring (12), and an exciter (6) is provided in the middle space of the box body (2) above the sieve plate, The exciter (6) is connected with the motor (7) installed on the frame (1), and the motor (7) drives the exciter (6) to generate an exciting force. The gap between the exciter (6) and the sieve plate A connecting shaft (8) is provided; the sieve plate is sequentially connected by a large sieve plate (9), a medium sieve plate (10) and a small sieve plate (11); The bottom of the plate is respectively equipped with a discharge port (13) for collecting dry raw coal of different particle sizes, and a degassing and dust removal negative pressure device (14) is installed on one side of the discharge port (13). After preliminary completion of the separation of dry raw coal and gas dust, it enters the gas-solid separator (15) for treatment and then discharges. 2. A low-rank coal vibration classification and drying equipment according to claim 1, characterized in that: the large sieve hole sieve plate (9), the medium sieve hole sieve plate (10) and the small sieve hole sieve plate ( 11) The apertures are: 25mm, 13mm and 6mm. 3. A low-rank coal vibration classification drying equipment according to claim 1 or 2, characterized in that: the large sieve sieve (9), the medium sieve (10) and the small sieve (11) Welded between them, the inclination angle of different sieve plates is between 5° and 15°, and the inclination angle of the sieve plate decreases gradually from the feed port to the discharge port. 4. A low-rank coal vibration classification drying equipment according to claim 1 or 2, characterized in that: the large sieve sieve (9), the medium sieve (10) and the small sieve (11) There are slots of different heights for easy replacement of the screen surface. 5. A low-rank coal vibration classification drying equipment according to claim 1, characterized in that there are multiple hot flue gas inlets (4). 6. A low-rank coal vibration classification drying equipment according to claim 1, characterized in that: a filter screen is installed between the degassing and dust removal negative pressure device (14) and the discharge port (13), so as to Avoid affecting the discharge of large particles of raw coal.