CN112779071B - A kind of high water content coal slime drying and upgrading system - Google Patents

Abstract

The invention discloses a high-water content coal slime drying and upgrading system, comprising a rotor dryer, a first hot air blower, a second hot air blower and a third hot air blower at the lower end of the rotor dryer, and a front side wall of the rotor dryer is provided with a There is a pretreatment device connected with the first drying chamber for dispersing the coal slime, a discharge port connected with the third drying chamber is arranged on the side wall of the rear part of the rotor dryer; a tail gas port is arranged on the top of the second drying chamber , the inlet of the exhaust gas treatment device is connected with the exhaust gas outlet, and the outlet of the exhaust gas treatment device is connected with the pretreatment device. The invention adopts a pretreatment device to mechanically disperse the coal slime by the pretreatment device, so as to weaken the viscosity and internal competitiveness of the coal slime, prevent the coal slime from agglomeration, and improve the subsequent drying efficiency of the coal slime; , while increasing the contact area between the slime and the hot air, it reduces the adhesion of the slime to the rotor and the drying cavity, and reduces the energy consumption to a certain extent.

Description

A kind of high water content coal slime drying and upgrading system

technical field

The invention relates to the technical field of mineral drying and sorting, in particular to a high-water content coal slime drying and upgrading system.

Background technique

my country's mineral resources are relatively rich, but the per capita possession is small, and the shortage of mineral resources is one of the important factors restricting my country's economic development. The development and utilization of mineral resources will cause environmental pollution to a certain extent. With the vigorous promotion of environmental protection by national policies, water spraying is currently required in the process of coal mining to reduce dust hazards. Therefore, to a certain extent, the content of raw coal will be increased. water volume. With the increase of coal mining output and the washing rate of raw coal in my country, the output of coal slime is also increasing year by year. Therefore, timely and effective solution to the problem of recovery and utilization of coal slime in coal preparation plants is important for protecting the environment, saving energy, and improving efficiency. are all significant.

Coal slime is a by-product of raw coal with a particle size of less than 0.5mm after washing. It has the characteristics of high moisture, high viscosity, high ash content, low calorific value, flying in the wind, and water loss. At present, pressure filters and The plate and frame filter press processes the coal slime, but the results show that the calorific value of the coal slime through the pressure filter and the plate and frame filter press has not been greatly improved, and the addition of the mixed coal will not only affect the overall calorific value of the mixed coal. , and lead to unstable coal quality, so stable, reliable and efficient coal slime drying technology is currently a difficult problem.

SUMMARY OF THE INVENTION

In order to solve the problem of unstable coal quality caused by the treatment of coal slime by a pressure filter and a plate-and-frame filter press, the present invention proposes a high-water content coal slime drying and upgrading system.

In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:

A high-water content coal slime drying and upgrading system, comprising:

Rotor dryer, the interior of the rotor dryer cavity is a first drying chamber, a second drying chamber, and a third drying chamber in order from front to back. duct, the second air duct, the third air duct, the front side wall of the rotor dryer is provided with a pretreatment device that is connected to the first drying chamber for dispersing the coal slime, and the rear side wall of the rotor dryer is provided with There is a discharge port communicated with the third drying chamber; the top of the second drying chamber is provided with a tail gas port; the first hot air blower is arranged at the lower end of the first air duct, and the first hot air blower blows air to the first drying chamber through the first air duct The second hot air blower is arranged at the lower end of the second air duct, and the second hot air blower blows through the second air duct to the second drying chamber; the third hot air blower is arranged at the lower end of the third air duct, and the third hot air blower passes through the third The air duct blows air to the third drying chamber; the inlet of the exhaust gas treatment device is connected with the exhaust gas outlet, and the outlet of the exhaust gas treatment device is connected with the pretreatment device.

Preferably, the air volume adjustment ranges of the first hot air blower, the second hot air blower and the third hot air blower are all 8-30 cubic meters per minute, and the temperature adjustment ranges are all 230-600°C.

Preferably, the first hot air blower and the second hot air blower are air hot air blowers, and the third hot air blower is a carbon dioxide hot air blower.

Preferably, the pretreatment device includes a casing, and a rotating shaft is disposed at a central position inside the casing, and a plurality of rotating blades are evenly distributed in the axial direction of the rotating shaft.

Compared with the prior art, the beneficial effects of the present invention:

Using a pretreatment device, the coal slime is mechanically dispersed by the pretreatment device, which weakens the viscosity and internal competitiveness of the coal slime, prevents the coal slime from agglomeration, and improves the subsequent coal slime drying efficiency. The hot air is introduced into the bottom of the rotor dryer in sections, which increases the contact area between the slime and the hot air, reduces the adhesion of the slime to the rotor and the drying cavity, and reduces the energy consumption to a certain extent; the rotor dryer occupies a small area. The structure is compact, and the coal slime is forced to disperse in the drying chamber, so that the coal slime is fluidized and suspended with high surface renewal frequency, and it is fully in contact with the hot air. ; The carbon dioxide protective gas is introduced into the third drying chamber of the rotor dryer to increase the contact surface between the slime and the gas, and at the same time effectively prevent the slime from burning due to drying and heating up, which is very necessary to ensure the drying effect of the slime; The purified exhaust gas is passed into the pretreatment device, making full use of the waste heat and reducing the energy consumption. The invention has a wide range of adaptation to coal slime, can completely process high-moisture and high-viscosity materials, and has strong product moisture controllability. The invention is stable and reliable, simple in operation, high in drying efficiency, has wide practicability, is especially suitable for coal preparation plants with high coal slime content, and improves economic and environmental benefits.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention or the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Figure 1 is a schematic structural diagram of the high-water content coal slime drying and upgrading system of the present invention.

In the figure: 1, the first drying chamber; 2, the second drying chamber; 3, the third drying chamber; 4, the first air duct; 5, the second air duct; 6, the third air duct; 7, the pretreatment device ;7-1, shell; 7-2, rotating shaft; 7-3, rotating blade; 8, discharge port; 9, exhaust port; 10, first hot air blower; 11, second hot air blower; 12, third Hot air blower; 13. Exhaust gas treatment device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, a high-water content coal slime drying and upgrading system includes: a rotor dryer, and the interior of the rotor dryer cavity is a first drying chamber 1, a second drying chamber 2, and a third drying chamber from front to back. Cavity 3, the bottom of the first drying chamber 1, the second drying chamber 2, and the third drying chamber 3 are respectively provided with a first air duct 4, a second air duct 5, and a third air duct 6. There is a pretreatment device 7 communicating with the first drying chamber 1 for dispersing the coal slime. The pretreatment device 7 includes a casing 7-1. The inner center of the casing 7-1 is provided with a rotating shaft 7-2. The rotating shaft 7 -2 A number of rotating blades 7-3 are evenly distributed in the axial direction. The pretreatment device 7 drives the rotating shaft 7-2 and the rotating blade 7-3 to rotate through its internal motor, and uses high-speed mechanical rotation to break up the slime that needs to be dried, reducing its viscosity and internal competitiveness, and improving the subsequent drying efficiency. A discharge port 8 communicating with the third drying chamber 3 is provided on the side wall at the rear of the rotor dryer; an exhaust port 9 is provided on the top of the second drying chamber 2 .

The first hot air blower 10 is arranged at the lower end of the first air duct 4, and the first hot air blower 10 blows air to the first drying chamber 1 through the first air duct 4; the second hot air blower 11 is arranged at the lower end of the second air duct 5, The fan 11 blows air to the second drying chamber 2 through the second air duct 5; the third hot air blower 12 is arranged at the lower end of the third air duct 6, and the third hot air blower 12 blows air to the third drying chamber 3 through the third air duct 6; The air volume adjustment range of the first hot air blower 10, the second hot air blower 11, and the third hot air blower 12 are all 8-30 cubic meters per minute, and the temperature adjustment ranges are all 230-600 °C. Hot air is introduced into the bottom of the rotor dryer to increase the contact area during the drying process of the slime, avoid the influence of the stickiness of the slime on the drying effect, and improve the drying efficiency. The first hot air blower 10 and the second hot air blower 11 are air hot air blowers, and the third hot air blower 12 is a carbon dioxide hot air blower. Carbon dioxide is introduced into the third drying chamber 3 of the rotor dryer as a protective gas to prevent the coal slime from burning during the drying process and fully protect the smooth operation of the drying process. According to the level of slime water, hot air with different temperatures is introduced into the first hot air blower 10, the second hot air blower 11, and the third hot air blower 12 respectively, so as to fully ensure the drying effect.

The inlet of the exhaust gas treatment device 13 is connected to the exhaust gas port 9 , and the outlet of the exhaust gas treatment device 13 is connected to the pretreatment device 7 . The exhaust gas treatment device 7 treats the exhaust gas with heat discharged from the rotor dryer, and after purification, the exhaust gas is passed into the pretreatment device 7, and the waste heat of the exhaust gas is rationally utilized, saving energy and improving drying efficiency.

Claims (1)

1. The utility model provides a high water content coal slime is dry to be upgraded system which characterized in that: the method comprises the following steps:

the drying device comprises a rotor wing dryer, wherein a first drying cavity (1), a second drying cavity (2) and a third drying cavity (3) are sequentially arranged in the cavity of the rotor wing dryer from front to back, the bottoms of the first drying cavity (1), the second drying cavity (2) and the third drying cavity (3) are respectively provided with a first air duct (4), a second air duct (5) and a third air duct (6), the side wall of the front part of the rotor wing dryer is provided with a pretreatment device (7) communicated with the first drying cavity (1) and used for scattering coal slime, and the side wall of the rear part of the rotor wing dryer is provided with a discharge hole (8) communicated with the third drying cavity (3); the top of the second drying cavity (2) is provided with an exhaust port (9);

the first air heater (10) is arranged at the lower end of the first air channel (4), and the first air heater (10) blows air to the first drying cavity (1) through the first air channel (4);

the second air heater (11) is arranged at the lower end of the second air channel (5), and the second air heater (11) blows air to the second drying cavity (2) through the second air channel (5);

the third air heater (12) is arranged at the lower end of the third air duct (6), and the third air heater (12) blows air to the third drying cavity (3) through the third air duct (6);

the inlet of the tail gas treatment device (13) is connected with the tail gas port (9), and the outlet of the tail gas treatment device (13) is connected with the pretreatment device (7);

the air volume adjusting ranges of the first air heater (10), the second air heater (11) and the third air heater (12) are respectively 8-30 cubic meters per minute, and the temperature adjusting ranges are respectively 230-600 ℃;

the first air heater (10) and the second air heater (11) are air heat blowers, and the third air heater (12) is a carbon dioxide air heater;

the pretreatment device (7) comprises a shell (7-1), a rotating shaft (7-2) is arranged at the center of the interior of the shell (7-1), and a plurality of rotating blades (7-3) are uniformly distributed on the rotating shaft (7-2) in the axial direction.

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