阅读说明：本技术 一种高含水量煤泥干燥提质系统 (Drying and upgrading system for high-water-content coal slime ) 是由 张博 赵跃民 闫光辉 段晨龙 董良 江海深 赵鹏飞 郭梦瑶 高天洋 于 2021-01-08 设计创作，主要内容包括：本发明公开了一种高含水量煤泥干燥提质系统,包括旋翼干燥机,旋翼干燥机下端的第一热风机、第二热风机、第三热风机,旋翼干燥机前部侧壁上设有与第一干燥腔连通的用于将煤泥打散的预处理装置,旋翼干燥机后部侧壁上设有与第三干燥腔连通的排料口；第二干燥腔顶部设有尾气口,尾气处理装置的进口与尾气口连接,尾气处理装置的出口与预处理装置连接。本发明采用预处理装置,将煤泥利用预处理装置机械打散,减弱煤泥的粘性与内部竞争力,防止煤泥团聚,提高后续煤泥干燥效率；在旋翼干燥机底部分段通入热风,增加煤泥与热风接触面积的同时,降低了煤泥黏附在旋翼以及干燥腔的情况,在一定程度上降低了能耗。(The invention discloses a high-water content coal slime drying and upgrading system which comprises a rotor wing dryer, a first air heater, a second air heater and a third air heater which are arranged at the lower end of the rotor wing dryer, wherein a pretreatment device communicated with a first drying cavity and used for scattering coal slime is arranged on the side wall of the front part of the rotor wing dryer, and a discharge port communicated with the third drying cavity is arranged on the side wall of the rear part of the rotor wing dryer; the top of the second drying cavity is provided with a tail gas port, the inlet of the tail gas treatment device is connected with the tail gas port, and the outlet of the tail gas treatment device is connected with the pretreatment device. According to the invention, the pretreatment device is adopted, the coal slime is mechanically scattered by the pretreatment device, the viscosity and the internal competitiveness of the coal slime are weakened, the coal slime agglomeration is prevented, and the subsequent coal slime drying efficiency is improved; the bottom of the rotary wing dryer is provided with hot air in a segmented mode, the contact area of the coal slime and the hot air is increased, the adhesion of the coal slime to a rotary wing and a drying cavity is reduced, and energy consumption is reduced to a certain extent.)

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 tail gas treatment device (13), the import and the tail gas mouth (9) of tail gas treatment device (13) are connected, the export and the preprocessing device (7) of tail gas treatment device (13) are connected.

2. The high water content coal slime drying and upgrading system according to claim 1, characterized in that: the air volume adjusting ranges of the first air heater (10), the second air heater (11) and the third air heater (12) are 8-30 cubic meters per minute, and the temperature adjusting ranges are 230-600 ℃.

3. The high water content coal slime drying and upgrading system according to claim 1, characterized in that: 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.

4. The high water content coal slime drying and upgrading system according to claim 1, characterized in that: 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.

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

Mineral resources in China are relatively rich, but the quantity of all people is small, and the shortage of mineral resources is one of important factors limiting the economic development of China. The development and utilization of mineral resources can cause environmental pollution to a certain extent, along with the vigorous advocation of national policies to environmental protection, need spray water at present in the coal mining process, reduce the raise dust harm, consequently can increase the water content of raw coal to a certain extent. Along with the increase of the coal mining yield and the raw coal washing rate in China, the coal slime yield is increased year by year, so that the problems of coal slime recovery and utilization in a coal preparation plant are timely and effectively solved, and the method has important significance in the aspects of protecting the environment, saving energy, improving benefits and the like.

The coal slime is a byproduct with the granularity of less than 0.5mm after raw coal is washed and selected, has the characteristics of high moisture, high viscosity, high ash content, low calorific value, flying in the wind, loss in the water and the like, is treated by a multi-purpose pressure filter and a plate-and-frame filter press in the prior art, but results show that the calorific value of the coal slime subjected to the pressure filter and the plate-and-frame filter press is not greatly improved, and the coal slime is not only influenced on the integral calorific value of mixed coal after being mixed with the mixed coal, but also causes unstable coal quality, so that the stable, reliable and efficient coal slime drying technology is a difficult problem at present.

Disclosure of Invention

The invention provides a high-water-content coal slime drying and upgrading system, aiming at solving the problems that coal quality is unstable and the like caused by the treatment of a pressurizing filter and a plate-and-frame filter press on coal slime.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

a high water content coal slurry drying and upgrading system comprises:

the rotary wing dryer comprises a rotary wing dryer body, wherein a first drying cavity, a second drying cavity and a third drying cavity are sequentially arranged in the rotary wing dryer body from front to back, the bottoms of the first drying cavity, the second drying cavity and the third drying cavity are respectively provided with a first air duct, a second air duct and a third air duct, the side wall of the front part of the rotary wing dryer is provided with a pretreatment device communicated with the first drying cavity and used for scattering coal slime, and the side wall of the rear part of the rotary wing dryer is provided with a discharge port communicated with the third drying cavity; the top of the second drying cavity is provided with an exhaust port; the first air heater is arranged at the lower end of the first air channel and blows air to the first drying cavity through the first air channel; the second air heater is arranged at the lower end of the second air duct and blows air to the second drying cavity through the second air duct; the third air heater is arranged at the lower end of the third air duct and blows air to the third drying cavity through the third air duct; the inlet of the tail gas treatment device is connected with the tail gas port, and the outlet of the tail gas treatment device is connected with the pretreatment device.

Preferably, the air volume adjusting ranges of the first air heater, the second air heater and the third air heater are 8-30 cubic meters per minute, and the temperature adjusting ranges are 230-600 ℃.

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 comprises a shell, a rotating shaft is arranged in the center of the inside of the shell, and a plurality of rotating blades are axially and uniformly distributed on the rotating shaft.

Compared with the prior art, the invention has the beneficial effects that:

the pretreatment device is adopted to mechanically break up the coal slime, so that the viscosity and the internal competitiveness of the coal slime are weakened, the coal slime agglomeration is prevented, and the subsequent coal slime drying efficiency is improved. Hot air is introduced into the bottom section of the rotary wing dryer, so that the contact area of the coal slime and the hot air is increased, the condition that the coal slime is adhered to the rotary wing and a drying cavity is reduced, and the energy consumption is reduced to a certain extent; the rotary wing dryer occupies a small area and has a compact structure, the coal slime is forced to disperse in the drying cavity, the surface of the fluidized and suspended coal slime has high updating frequency and is fully contacted with hot air, and the heat and mass transfer effect of the coal slime and the hot air is good, the efficiency is high, and the energy consumption is low; carbon dioxide protective gas is introduced into a third drying cavity of the rotor wing dryer, so that the contact surface of the coal slime and gas is increased, and the coal slime is effectively prevented from being burnt due to drying and temperature rise, and the drying effect of the coal slime is very necessary to be ensured; the tail gas purified by the tail gas treatment device is introduced into the pretreatment device, so that the waste heat is fully utilized, and the energy consumption is reduced. The invention has wide application range to coal slime, can completely treat high-moisture and high-viscosity materials, and has strong product moisture controllability. The invention has the advantages of stability, reliability, simple operation, high drying efficiency and wide practicability, is particularly suitable for coal preparation plants with high coal slime content, and improves the economic and environmental benefits.

Drawings

For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a high water content coal slurry drying and upgrading system according to the present invention.

In the figure: 1. a first drying chamber; 2. a second drying chamber; 3. a third drying chamber; 4. a first air duct; 5. a second air duct; 6. a third air duct; 7. a pretreatment device; 7-1, a shell; 7-2, a rotating shaft; 7-3, rotating blades; 8. a discharge outlet; 9. a tail gas port; 10. a first air heater; 11. a second air heater; 12. a third air heater; 13. an exhaust gas treatment device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a high water content coal slurry drying and upgrading system comprises: a first drying cavity 1, a second drying cavity 2 and a third drying cavity 3 are sequentially arranged in a cavity of the rotor wing dryer from front to back, a first air duct 4, a second air duct 5 and a third air duct 6 are respectively arranged at the bottoms of the first drying cavity 1, the second drying cavity 2 and the third drying cavity 3, a pretreatment device 7 which is communicated with the first drying cavity 1 and used for scattering coal slime is arranged on the side wall of the front portion of the rotor wing dryer, the pretreatment device 7 comprises a shell 7-1, a rotating shaft 7-2 is arranged in the shell 7-1 at the inner center position, and a plurality of rotating blades 7-3 are axially and uniformly distributed on the rotating shaft 7-2. The pretreatment device 7 drives the rotating shaft 7-2 and the rotating blades 7-3 to rotate through a motor inside the pretreatment device, coal slime to be dried is scattered by high-speed mechanical rotation, the viscosity and the internal competitiveness of the coal slime are reduced, and the subsequent drying efficiency is improved. A discharge port 8 communicated with the third drying cavity 3 is arranged on the side wall of the rear part of the rotor wing dryer; the top of the second drying chamber 2 is provided with an exhaust port 9.

The first air heater 10 is arranged at the lower end of the first air duct 4, and the first air heater 10 blows air to the first drying cavity 1 through the first air duct 4; the second air heater 11 is arranged at the lower end of the second air duct 5, and the second air heater 11 blows air to the second drying cavity 2 through the second air duct 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 air volume adjusting ranges of the first air heater 10, the second air heater 11 and the third air heater 12 are 8-30 cubic meters per minute, and the temperature adjusting ranges are 230-600 ℃. The bottom of the rotor wing dryer is filled with hot air, so that the contact area of the coal slime in the drying process is increased, the influence on the drying effect due to the viscosity of the coal slime is avoided, and the drying efficiency is improved. The first air heater 10, the second air heater 11 are air heating fans, and the third air heater 12 is a carbon dioxide air heater. Carbon dioxide is introduced into the third drying cavity 3 of the rotor wing dryer and serves as protective gas, so that combustion of coal slime in the drying process is prevented, and the stable operation of the drying process is fully protected. Hot air with different temperatures is respectively introduced into the first air heater 10, the second air heater 11 and the third air heater 12 according to the water volume of the coal slime, so that the drying effect is fully ensured.

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. Exhaust tail gas that has heat among the rotor desiccator is handled to tail gas processing apparatus 7, lets in preprocessing device 7 with tail gas after the purification, and the drying efficiency is improved to rational utilization tail gas waste heat when the energy saving.