CN111998619B - Coal slime drying treatment device - Google Patents
Coal slime drying treatment device Download PDFInfo
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- CN111998619B CN111998619B CN202010896192.4A CN202010896192A CN111998619B CN 111998619 B CN111998619 B CN 111998619B CN 202010896192 A CN202010896192 A CN 202010896192A CN 111998619 B CN111998619 B CN 111998619B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/003—Filters in combination with devices for the removal of liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/24—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by reciprocating plunger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a coal slime drying treatment device, belongs to the field of coal slime drying, and solves the problems of uneven heating of coal slime, overheating decomposition of an outer layer and insufficient drying of an inner layer in the prior art. The device comprises a concentration unit, a filter pressing unit and a strip making drying unit which are sequentially connected, wherein the strip making drying unit comprises an extrusion assembly, a drying assembly positioned below the extrusion assembly and a strip making pore plate positioned between the extrusion assembly and the drying assembly, the extrusion assembly comprises an extrusion barrel and a piston positioned in the extrusion barrel, the drying assembly comprises a drying barrel and a gas supply unit used for providing dry gas for the drying barrel, the space between the piston in the extrusion barrel and the strip making pore plate is an extrusion cavity, the drying barrel is internally provided with a drying cavity, the extrusion cavity is communicated with a feeding pipe, and the drying barrel is communicated with a discharging pipe. The device can be used for concentrating, filter-pressing, strip-making and drying the coal slime.
Description
Technical Field
The invention belongs to the field of coal slime drying, and particularly relates to a coal slime drying treatment device.
Background
In the production of the plant selection, the produced byproduct coal slime has high water content, low heat value and low economic benefit, so the coal slime needs to be dried to improve the heat value, thereby improving the economic benefit.
The conventional drying technology easily causes the coal slime to be heated unevenly, and outer pyrolysis, the insufficient problem of inlayer drying can't realize the abundant drying to the coal slime, cause the heat energy waste easily.
Disclosure of Invention
In view of the above analysis, the invention aims to provide a coal slime drying treatment device, which solves the problems of uneven heating of coal slime, overheating decomposition of an outer layer and insufficient drying of an inner layer in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
the invention provides a coal slime drying treatment device, which comprises a concentration unit, a filter pressing unit and a strip making drying unit which are sequentially connected, wherein the strip making drying unit comprises an extrusion assembly, a drying assembly positioned below the extrusion assembly and a strip making pore plate positioned between the extrusion assembly and the drying assembly, the extrusion assembly comprises an extrusion cylinder and a piston positioned in the extrusion cylinder, the drying assembly comprises a drying cylinder and a gas supply unit used for providing dry gas for the drying cylinder, the space between the piston in the extrusion cylinder and the strip making pore plate is an extrusion cavity, the drying cylinder is a drying cavity, the extrusion cavity is communicated with a feeding pipe, and the drying cylinder is communicated with a discharge pipe; that is, the piston, the extrusion chamber, the orifice plate, and the drying chamber are arranged in this order in the vertical direction.
Furthermore, the coal slime drying treatment device is particularly suitable for low-order coal slime.
Furthermore, in the coal slime drying treatment device, a drying object of the strip making and drying unit is particularly suitable for fine-grained high-viscosity coal slime which flows through a bottom flow of a concentrator and is subjected to pressure filtration, the granularity of the fine-grained high-viscosity coal slime is less than 0.5mm, and the water content of the fine-grained high-viscosity coal slime is 20% -24%; the dry gas is derived from flue gas tail gas obtained by burning a boiler in a power plant.
Further, the concentration unit comprises a concentrator, an underflow pipeline and a concentration underflow pump, wherein a discharge port of the concentrator is connected with a feed port of the filter pressing unit through the underflow pipeline, and the concentration underflow pump is arranged on the underflow pipeline.
Furthermore, the underflow concentration of the thickener is 350 g/L-400 g/L.
Furthermore, the filter pressing unit comprises a filter press and a filter pressing motor for providing power for the filter press, a discharge hole of the filter press is connected with a feed pipe of the strip making drying unit, and the filter pressing motor is fixedly arranged on the mounting surface.
Further, the filter press is a plate and frame filter press.
Furthermore, the feeding pressure of the filter press is 0.11MPa to 0.12MPa, and the filter press pressure of the filter press is 0.10MPa to 0.20 MPa.
Furthermore, a discharge port of the filter press is connected with a feed pipe of the strip making drying unit through a transmission assembly, the transmission assembly comprises a belt, a belt roller, a belt motor and a belt support, two ends of the belt are respectively sleeved on partial peripheral surfaces of the belt roller, two ends of the belt are rotatably connected with the belt through the belt roller, the belt motor is fixedly arranged on a cross beam of the belt support and used for driving the belt roller to rotate, and the discharge port of the filter press is positioned above the belt.
Further, the belt is horizontally placed.
Further, the coal slime drying treatment device also comprises a heat recovery unit connected with the smoke outlet of the drying cylinder.
Further, the heat recovery unit comprises an evaporator, a compressor, a condenser, a liquid storage device and an expansion valve which are connected in sequence, and the evaporator is connected with a smoke outlet of the strip making drying unit.
Further, along vertical direction, piston, extrusion chamber, system orifice plate, dry chamber arrange in proper order.
Further, the strip making and drying unit further comprises a pressure sensor for detecting the pressure of the coal slurry in the extrusion cavity.
Further, the pressure sensor is positioned at the bottom of the extrusion cavity and on the strip making hole plate.
Further, the above-mentioned strip making drying unit also includes a temperature sensor for detecting the temperature of the drying chamber.
Furthermore, the temperature sensor is positioned on the side wall of the drying cavity or is arranged on the axis of the drying cavity in a suspension manner.
Further, the strip making and drying unit also comprises an exciter for driving the extrusion cylinder and the feeding pipe to vibrate.
Further, the vibration exciter is arranged below the feeding pipe and is in contact with the side wall of the feeding pipe.
Furthermore, the strip making drying unit further comprises a distributing assembly located in the extrusion cavity, the distributing assembly comprises a material conveying plate and a distributing plate, one end of the material conveying plate is a connecting end, the other end of the material conveying plate is a hanging end, the hanging end extends to the axis of the extrusion cavity, the connecting end of the material conveying plate is rotatably connected with the side wall of the extrusion cavity, the distributing plate is hung at the hanging end of the material conveying plate, the material conveying plate is shaped like a downward inclined flat plate, and the distributing plate is shaped like an umbrella.
Furthermore, the cloth assembly further comprises a lifting belt, one end of the lifting belt is connected with the suspended end of the material conveying plate, and the other end of the lifting belt penetrates through the feeding pipe to be connected with the upper end face of the piston, so that the suspended end of the material conveying plate is opposite to the movement direction of the piston.
Furthermore, the connecting end of the material conveying plate is rotationally connected with the side wall of the extrusion cavity through a torsion spring; or the suspended end of the material conveying plate faces one side of the strip making hole plate and is connected with the side wall of the extrusion cavity through a spiral tension spring.
Further, the air supply unit comprises a main air pipe and a main air flow disperser communicated with the main air pipe, the main air flow disperser is positioned on one side of the drying cavity, and the main air pipe, the main air flow disperser and the drying cavity are sequentially connected.
Further, the air supply unit further comprises an auxiliary air pipe and an auxiliary air flow disperser communicated with the auxiliary air pipe, and the main air flow disperser and the auxiliary air flow disperser are respectively positioned on two sides of the drying cavity.
Further, the primary air disperser and the secondary air disperser are located on the same horizontal line and are symmetrically arranged with respect to the axis of the drying chamber.
Further, the temperature of the drying gas is less than or equal to 500 ℃.
Further, the temperature of the drying gas is 140 ℃ to 200 ℃.
Further, the temperature of the drying gas provided by the main gas pipe is higher than that of the drying gas provided by the auxiliary gas pipe.
Furthermore, the difference value between the temperature of the drying gas provided by the main gas pipe and the temperature of the drying gas provided by the auxiliary gas pipe is 10-15 ℃.
Further, the strip making and drying unit also comprises a gas-solid separator communicated with the drying cavity.
Further, the gas-solid separator is a bag-type dust collector.
Furthermore, the feeding pipe is arranged on the side wall of the extrusion cavity, and the discharging pipe is positioned at the bottom of the drying cavity.
Furthermore, the strip making and drying unit further comprises a support assembly, the support assembly comprises a square support plate and a foot support, the square support plate is supported on the installation surface through the foot support, and the drying cylinder is erected on the square support plate.
Furthermore, the supporting assembly further comprises a sleeve and a fastening plate, the strip making pore plate is fixedly connected with the drying cylinder through the fastening plate, and the sleeve is sleeved on the outer side of the extrusion cylinder and is fixedly connected with the strip making pore plate.
Further, sleeve, mounting plate, time shape backup pad and foot pillar set gradually along vertical direction.
Further, the diameter of the extrusion hole of the strip-making orifice plate is 10mm to 100 mm.
Further, the diameter of the extrusion cylinder is 2m to 5 m.
Further, the diameter of the drying cylinder is 2.5m to 7.5 m.
Further, the piston running distance is 0.5m to 3 m.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) the coal slime drying treatment device provided by the invention is comprehensively provided with the concentration unit, the filter pressing unit and the strip making drying unit, can finish concentration, filter pressing, strip making and drying of coal slime on one production line, and has the advantages of simple structure and high production efficiency.
b) In the coal slime drying treatment device provided by the invention, the strip making and drying unit is an integrated unit of coal slime feeding, strip making and drying, the coal slime is extruded and made into strips through the piston, water in the coal slime can be extruded in the extrusion process, and strip making and primary drying are simultaneously completed; dry gas is introduced into the drying cavity through the gas supply unit, coal slime strips hung below the strip making pore plates are dried for the second time, the coal slime is dried for the second time in the whole strip making drying process, the link difficulty in the middle link is reduced, the structure is simple, the operation is convenient, the operation cost is low, the strip making drying efficiency is high, the energy consumption is low, and the problem that the water content of filter-pressed coal slime is too high is effectively solved.
c) In the coal slime drying treatment device provided by the invention, the coal slime is pressed into a strip shape through the piston, so that not only can the fine particles be prevented from being directly combusted by contacting with high-temperature flue gas, but also the dust pollution caused by the powder phenomenon after the coal slime is dried can be reduced, and the environment is protected.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a schematic structural diagram of a coal slurry drying treatment device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a strip making and drying unit in a coal slime drying and processing device according to an embodiment of the present invention.
Reference numerals:
1-an extrusion cylinder; 2-a piston; 3-drying the cylinder; 4-making a strip hole plate; 5-feeding pipe; 6-a discharge pipe; 7-a vibration exciter; 8-a cloth component; 81-a material conveying plate; 82-a cloth plate; 83-a lifting belt; 9-main trachea; 10-main gas flow disperser; 11-auxiliary trachea; 12-an auxiliary airflow disperser; 13-gas-solid separator; 14-a clip-shaped support plate; 15-a foot prop; 16-a sleeve; 17-a fastening plate; 18-a thickener; 19-an underflow pipe; 20-a filter press; 21-a filter pressing motor; 22-belt rollers; 23-a belt motor; 24-a belt; 25-a belt support; 26-an evaporator; 27-an expansion valve; 28-a reservoir; 29-a condenser; 30-a compressor; 31-concentration underflow pump.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
Example one
The embodiment provides a coal slime drying treatment device, which is shown in fig. 1 to 2 and comprises a concentration unit, a filter pressing unit and a strip making drying unit which are sequentially connected, wherein the strip making drying unit comprises an extrusion assembly, a drying assembly positioned below the extrusion assembly and a strip making pore plate 4 positioned between the extrusion assembly and the drying assembly, the extrusion assembly comprises an extrusion cylinder 1 and a piston 2 positioned in the extrusion cylinder 1, the drying assembly comprises a drying cylinder 3 and a gas supply unit used for providing drying gas for the drying cylinder 3, the space between the piston 2 and the strip making pore plate 4 in the extrusion cylinder 1 is an extrusion cavity, the drying cylinder 3 is internally provided with a drying cavity, the extrusion cavity is communicated with a feeding pipe 5, and the drying cylinder 3 is communicated with a discharging pipe 6; that is, the piston 2, the extrusion chamber, the strip hole plate 4, and the drying chamber are arranged in this order in the vertical direction.
When the method is implemented, the coal slime is concentrated through a concentration unit; conveying the concentrated coal slime to a filter pressing unit for filter pressing and dehydration to obtain a blocky coal slime filter cake; conveying the filter-pressed coal slime filter cake to a strip making drying unit, feeding the coal slime into an extrusion cavity from a feeding pipe 5, closing the feeding pipe 5 when the coal slime in the extrusion cavity reaches a certain amount, opening a piston 2, enabling the piston 2 to move towards a strip making pore plate 4, gradually reducing the volume of the extrusion cavity, enabling the piston 2 to extrude the coal slime, enabling the coal slime to pass through a strip making pore of the strip making pore plate 4 under the action of pressure, completing compression cutting and extrusion drying of the coal slime, stopping compression after the piston 2 is compressed to a certain distance, and resetting the piston 2; the coal slime strips formed by extrusion are vertically suspended below the strip making pore plates 4 and in the drying cavity, the air supply unit supplies dry gas into the drying cavity, the dry gas and the coal slime strips carry out mass and heat transfer, and the coal slime strips are dried to obtain dried coal slime strips, so that the strip making drying by concentration and pressure filtration of the coal slime is completed.
It should be noted that the coal slime drying treatment device provided by the embodiment is particularly suitable for low-order coal slime. In the coal slime drying treatment device, a drying object of the strip making and drying unit is particularly suitable for fine-grained high-viscosity coal slime which flows through a concentrating machine and is subjected to filter pressing, the granularity of the fine-grained high-viscosity coal slime is less than 0.5mm, and the water content of the fine-grained high-viscosity coal slime is 20-24%; the dry gas is derived from flue gas tail gas obtained by burning a power plant boiler, so that energy can be saved, and the environment is protected.
Compared with the prior art, the coal slime drying treatment device that this embodiment provided sets up concentration unit, filter pressing unit and system strip drying unit comprehensively, can accomplish the concentration, filter pressing, system strip and the drying of coal slime on a production line, simple structure, and production efficiency is high.
Meanwhile, in the coal slime drying treatment device, the strip making and drying unit is an integrated unit of coal slime feeding, strip making and drying, the coal slime is extruded and made into strips through the piston 2, water in the coal slime can be extruded in the extrusion process, and strip making and primary drying are completed simultaneously; dry gas is introduced into the drying cavity through the gas supply unit, coal slime strips hung below the strip making pore plate 4 are dried for the second time, the coal slime is dried for the second time in the whole strip making drying process, the link difficulty in the middle link is reduced, the structure is simple, the operation is convenient, the operation cost is low, the strip making drying efficiency is high, the energy consumption is low, and the problem of overhigh water content of filter-pressed coal slime is effectively solved.
In addition, press into the strip through piston 2 with the coal slime, not only can prevent that the fine particle from contacting high temperature flue gas direct combustion, can also reduce the dust pollution that the dry back powder phenomenon of coal slime caused, the environmental protection.
As for the structure of the concentration unit, specifically, it includes a thickener 18, an underflow pipe 19 and a concentration underflow pump 31, wherein the discharge port of the thickener 18 is connected to the feed port of the filter press unit (i.e., the feed port of the filter press 20 described below) through the underflow pipe 19, and the concentration underflow pump 31 is provided on the underflow pipe 19. The coal slime is concentrated by a thickener 18 and then is pumped into a filter pressing unit through a bottom flow pipeline 19 for filter pressing dehydration. Illustratively, the underflow concentration of the thickener 18 is 350-400 g/L.
As for the structure of the filter press unit, specifically, it includes a filter press 20 (for example, a plate and frame filter press 20) and a filter press motor 21 for powering the filter press 20, the discharge port of the filter press 20 is connected to the feed pipe 5 of the rod making drying unit, and the filter press motor 21 is fixedly installed on the installation surface (for example, a supporting civil engineering). The coal slurry concentrated by the concentration unit is subjected to filter pressing and dehydration by a filter press 20.
Since an excessively high feed pressure is likely to cause damage to the equipment and the filter chamber of the filter press 20 is not closed at the initial stage of the feed, the pressure of the filter press 20 is 0.11 to 0.12MPa in the feed stage and the pressure of the filter press 20 is 0.10 to 0.20MPa (e.g., 0.15MPa) in the filter press stage, and the moisture content of the coal slurry cake obtained by the filter press 20 using the above pressures is 20 to 30% (e.g., 25%).
Illustratively, the discharge port of the filter press 20 is connected to the feeding pipe 5 of the strip making drying unit through a transmission assembly, the transmission assembly includes a belt 24, a belt roller 22, a belt motor 23 and a belt support 25, two ends of the belt 24 are respectively sleeved on a part of the outer circumferential surface of the belt roller 22, the belt 24 is horizontally placed, two ends of the belt 24 are rotatably connected to the belt 24 through the belt roller 22, the belt motor 23 is fixedly arranged on a cross beam of the belt support 25 and is used for driving the belt roller 22 to rotate and further driving the belt 24 to operate, the discharge port of the filter press 20 is located above the belt 24, a coal slurry filter cake is discharged from the discharge port of the filter press 20 and falls on the belt 24, and filter press tail coal is conveniently transported to the feeding pipe 5 of the strip making drying unit through the belt 24.
In order to recover the redundant heat of the coal slime drying treatment device, the device also comprises a heat recovery unit connected with the smoke outlet of the strip making drying unit, and the redundant heat is recycled.
Specifically, the heat recovery unit includes an evaporator 26, a compressor 30, a condenser 29, an accumulator 28, and an expansion valve 27, which are connected in this order, and the evaporator 26 is connected to the flue gas outlet of the rod making and drying unit. The excessive heat in the flue gas discharged by the strip making drying unit is collected through an evaporator 26 in the heat pump, the collected hot gas is compressed through a compressor 30, the compressed hot gas is introduced into a condenser 29 and then sequentially passes through a liquid storage device 28 and an expansion valve 27 to be used for further heating the dried gas of the strip making drying unit, and therefore the recycling of the excessive heat is completed.
Considering that the pressure in the extrusion chamber affects the extrusion efficiency of the coal slime strips, the strip making drying unit further comprises a pressure sensor (not shown in the figure) for detecting the pressure of the coal slime in the extrusion chamber, and the pressure sensor is exemplarily positioned at the bottom of the extrusion chamber and on the strip making orifice plate 4. The pressure of the coal slime in the extrusion cavity can be monitored in real time through the pressure sensor, and the running distance of the piston 2 is adjusted according to the pressure of the coal slime, so that the extrusion efficiency is regulated and controlled.
Considering that the temperature in the drying chamber affects the drying efficiency of the coal slurry strips, the strip making drying unit further comprises a temperature sensor (not shown in the figure) for detecting the temperature of the drying chamber, and the temperature sensor is exemplarily positioned on the side wall of the drying chamber or suspended on the axis of the drying chamber. The temperature in the drying cavity can be monitored in real time through the temperature sensor, and the temperature and the gas supply quantity of the drying gas are adjusted according to the temperature in the drying cavity, so that the drying efficiency is regulated and controlled.
In order to promote the dispersion and filling of the coal slurry in the extrusion chamber, the rod making and drying unit further comprises an exciter 7 for driving the extrusion cylinder 1 and the feeding pipe 5 to vibrate, and the exciter 7 is exemplarily arranged below the feeding pipe 5 and is in contact with the side wall of the feeding pipe 5. Under the effect of vibration exciter 7, the coal slime is automatic to be got into the extrusion chamber from inlet pipe 5 to the dispersion is filled in the bottom in extrusion chamber, also be exactly on system strip orifice plate 4, after the further vibration of vibration exciter 7, the coal slime volume in the extrusion chamber reaches certain thickness and degree of fullness, and the thickness homogeneity improves to some extent, realizes even pan feeding, extrudees the coal slime in-process at piston 2, and the coal slime atress is even, is favorable to the extrusion of piston 2 to the coal slime more.
Similarly, in order to promote the dispersion of the coal slurry in the extrusion chamber, the strip making and drying unit further comprises a material distribution assembly 8 located in the extrusion chamber, and for the structure of the material distribution assembly 8, specifically, the strip making and drying unit comprises a material conveying plate 81 and a material distribution plate 82, one end of the material conveying plate 81 is a connecting end, the other end is a free end, exemplarily, the free end extends to the axis of the extrusion chamber, the connecting end is rotatably connected with the side wall of the extrusion chamber (i.e., the side wall of the extrusion barrel 1 located below the piston 2), the material distribution plate 82 is hung at the free end of the material conveying plate 81, the material conveying plate 81 is in a downward inclined flat plate shape, and the material distribution plate 82 is in an umbrella shape. Thus, after the coal slurry enters the extrusion chamber from the feeding pipe 5, the coal slurry firstly falls on the material conveying plate 81, then moves downwards along the material conveying plate 81 to the material distributing plate 82, and is uniformly dispersed to the bottom of the extrusion chamber along the umbrella-shaped material distributing plate 82, so that the dispersion uniformity of the coal slurry in the extrusion chamber is improved.
It should be noted that, in order to complete the extrusion of the coal slurry, the piston 2 needs to reciprocate in the extrusion cylinder 1, and the existence of the distribution assembly 8 should not affect the reciprocating motion of the piston 2, therefore, the distribution assembly 8 further includes a lifting belt 83, one end of the lifting belt 83 is connected with the free end of the material conveying plate 81, and the other end of the lifting belt 83 passes through the feeding pipe 5 to be connected with the upper end face of the piston 2, so that the free end of the material conveying plate 81 is opposite to the moving direction of the piston 2. Specifically, when the piston 2 moves towards the direction close to the strip making orifice plate 4, the part of the lifting belt 83 connected with the piston 2 is extended, and the part of the lifting belt 83 connected with the suspended end of the material conveying plate 81 is shortened, so that the suspended end of the material conveying plate 81 moves towards the direction far away from the strip making orifice plate 4, that is, the material conveying plate 81 rotates clockwise by taking the connected end of the material conveying plate 81 as a rotating shaft, and the suspended end of the material conveying plate 81 and the material distributing plate 82 enter the material feeding pipe 5 and leave the extrusion cavity, so that the reciprocating motion of the piston 2 is not interfered; when the piston 2 moves in the direction away from the strip making hole plate 4, the part of the lifting belt 83 connected with the piston 2 is shortened, the part of the lifting belt 83 connected with the suspension end of the material conveying plate 81 is prolonged, so that the suspension end of the material conveying plate 81 moves in the direction close to the strip making hole plate 4, namely, the connecting end of the material conveying plate 81 is used as a rotating shaft of the material conveying plate 81 to rotate anticlockwise, the suspension end of the material conveying plate 81 and the material distributing plate 82 enter the extrusion cavity, and material distribution is continued. It should be noted that when the material transfer plate 81 and the material distribution plate 82 enter the material feeding pipe 5, the material feeding pipe 5 can be closed, so as to further ensure that no coal slurry enters the extrusion chamber during the extrusion process of the piston 2.
It should be noted that, in order to ensure that the material conveying plate 81 and the material distributing plate 82 can return to the extrusion cavity again, the connecting end of the material conveying plate 81 may be rotationally connected to the side wall of the extrusion cavity through a torsion spring, and the material conveying plate 81 and the material distributing plate 82 are urged to return to the extrusion cavity again through the torsional force of the torsion spring; alternatively, the free end of the material transfer plate 81 is connected to the side wall of the extrusion chamber by a tension spring toward the strip hole plate 4, and the material transfer plate 81 and the material distribution plate 82 can be restored to the extrusion chamber again by the tension of the tension spring.
Specifically, the air supply unit includes a main air pipe 9 and a main air flow disperser 10 communicating with the main air pipe 9, the main air flow disperser 10 is located on one side of the drying chamber, and the main air pipe 9, the main air flow disperser 10, and the drying chamber are connected in this order. The dry gas gets into the air current deconcentrator through main trachea 9, and the even distribution board through the air current deconcentrator forms even stable dry gas, blows in the drying chamber, dries the coal slime strip that hangs perpendicularly in the drying chamber.
In order to ensure the drying uniformity of the coal slime strips in the drying cylinder 3, the gas supply unit further comprises an auxiliary gas pipe 11 and an auxiliary gas flow disperser 12 communicated with the auxiliary gas pipe 11, the main gas flow disperser 10 and the auxiliary gas flow disperser 12 are respectively positioned at two sides of the drying cavity, illustratively, the main gas flow disperser 10 and the auxiliary gas flow disperser 12 are positioned on the same horizontal line, and the two are symmetrically arranged relative to the axis of the drying cavity. This is because the main air disperser 10 is located at one side of the drying chamber, and blows in the drying gas from the side, the coal slime strips close to the main air disperser 10 firstly carry out mass transfer and heat transfer with the drying gas, the temperature of the drying gas after the mass transfer and heat transfer is reduced, the drying capacity is gradually reduced, and the coal slime strips far away from the main air disperser 10 are not thoroughly dried, and the auxiliary air pipe 11 and the auxiliary air flow disperser 12 are arranged at the other side of the drying chamber, so that the coal slime strips far away from the main air disperser 10 can be further dried, and the drying uniformity of the coal slime strips in the drying cylinder 3 is ensured.
In order to ensure the drying effect of the coal slime strips, the temperature of the drying gas is less than or equal to 500 ℃, illustratively, the temperature of the drying gas is 140-200 ℃, and in practical application, the temperature can be properly adjusted according to the granularity and the water content of the coal slime, the diameter of the coal slime strips and the like.
In consideration of drying the coal slime strips, the drying gas provided by the main gas pipe 9 is mainly used as the drying gas provided by the auxiliary gas pipe 11, so that the temperature of the drying gas provided by the main gas pipe 9 is higher than that of the drying gas provided by the auxiliary gas pipe 11, and exemplarily, the temperature difference between the two is 10 ℃ to 15 ℃. Like this, to the coal slime strip of keeping away from main air disperser 10, be equivalent to earlier carry out preliminary drying through the dry gas that main trachea 9 provided, then carry out secondary drying through the dry gas that supplementary trachea 11 provided again, the stack of two drying effect can basically with the drying effect of the coal slime strip that is close to main air disperser 10 to the whole dry homogeneity of coal slime strip has been guaranteed.
It should be noted that the dry gas and the coal slurry undergo heat and mass transfer to become low-temperature flue gas, the low-temperature flue gas contains solid dust (for example, small-particle coal slurry), and the low-temperature flue gas is directly discharged to the atmosphere to cause environmental pollution, therefore, the strip making drying unit further comprises a gas-solid separator 13 (for example, a bag-type dust remover) communicated with the drying chamber, the low-temperature flue gas obtained after the mass transfer and the heat transfer with the coal slurry strips enters the gas-solid separator 13 to remove the solid dust in the low-temperature flue gas, and then the low-temperature flue gas is discharged to the atmosphere, so that the environmental pollution of the strip making drying unit is reduced.
Illustratively, the coal slurry is fed without interfering with the movement of the piston 2, and the feeding pipe 5 is arranged on the side wall of the extrusion cavity; in order to facilitate the discharge of the coal slime blocks, the discharge pipe 6 is positioned at the bottom of the drying cavity, and the discharge is realized by utilizing the self gravity of the coal slime blocks.
In order to achieve a stable installation of the above-described strip making drying unit, it further includes a support assembly, specifically, the support assembly includes a square support plate 14 and a foot prop 15, the square support plate 14 is supported on a mounting surface (e.g., the ground) by the foot prop 15, and the drying drum 3 is erected on the square support plate 14.
Similarly, in order to realize stable installation between the extrusion container 1 and the strip making hole plate 4, and between the strip making hole plate 4 and the drying container 3, the support assembly further comprises a sleeve 16 and a fastening plate 17, the strip making hole plate 4 is fixedly connected with the drying container 3 through the fastening plate 17, and the sleeve 16 is sleeved outside the extrusion container 1 and is fixedly connected with the strip making hole plate 4.
Illustratively, the sleeve 16, the fastening plate 17, the clip support plate 14, and the foot support 15 are arranged in this order in the vertical direction.
In order to ensure that the coal slime strips can not self-ignite in the drying and drying process, the aperture of the extrusion holes of the strip-making perforated plate 4 is controlled to be 10 mm-100 mm. The reason is that the aperture of the extrusion hole is too small, the coal slime strips are easy to spontaneously combust in the drying and drying process, and the extrusion of the coal slime is not facilitated, so that the pressure in the extrusion cavity is too large; the aperture in extrusion hole is too big, can reduce the extrusion force of piston 2 to the coal slime, leads to extrusion drying effect relatively poor, and thick coal slime strip is unfavorable for drying.
In order to ensure the extrusion efficiency and the charging quantity of the extrusion container 1, the diameter of the extrusion container 1 is 2 m-5 m, and in practical application, the diameter can be properly adjusted according to the requirements of users and the treatment capacity.
The diameter of the drying cylinder 3 is controlled within the range of 2.5 m-7.5 m in order to ensure the drying uniformity of the whole coal slime strip. The diameter of the drying cylinder 3 is controlled within the range, so that the single treatment capacity of the drying cylinder 3 can be properly improved on the basis of ensuring the integral drying uniformity of the mud strips.
In order to ensure that the piston 2 fully extrudes the coal slime, the running distance of the piston 2 is controlled to be 0.5-3 m, the running distance of the piston 2 is limited in the range, the coal slime strips extruded by the strip making pore plate 4 have enough length, and meanwhile, the feeding of the coal slime can be met.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The coal slime drying treatment device is characterized by comprising a concentration unit, a filter pressing unit and a strip making drying unit which are sequentially connected, wherein the strip making drying unit comprises an extrusion assembly, a drying assembly positioned below the extrusion assembly and a strip making pore plate positioned between the extrusion assembly and the drying assembly;
the extrusion assembly comprises an extrusion cylinder and a piston positioned in the extrusion cylinder, and the drying assembly comprises a drying cylinder and a gas supply unit for supplying drying gas into the drying cylinder;
a space between a piston and a strip making hole plate in the extrusion cylinder is an extrusion cavity, a drying cavity is arranged in the drying cylinder, the extrusion cavity is communicated with a feeding pipe, and the drying cylinder is communicated with a discharging pipe;
the strip making and drying unit further comprises a material distribution assembly positioned in the extrusion cavity, the material distribution assembly comprises a material conveying plate and a material distribution plate, the free end of the material conveying plate extends to the axis of the extrusion cavity, the connecting end of the material conveying plate is rotatably connected with the side wall of the extrusion cavity, and the material distribution plate is hung at the free end of the material conveying plate;
the material distribution assembly further comprises a lifting belt, one end of the lifting belt is connected with the suspended end of the material conveying plate, and the other end of the lifting belt penetrates through the material inlet pipe to be connected with the upper end face of the piston, so that the suspended end of the material conveying plate is opposite to the movement direction of the piston;
the air supply unit comprises a main air pipe and a main air flow disperser communicated with the main air pipe, the main air flow disperser is positioned on one side of the drying cavity, and the main air pipe, the main air flow disperser and the drying cavity are sequentially connected;
the air supply unit also comprises an auxiliary air pipe and an auxiliary air flow disperser communicated with the auxiliary air pipe, and the main air flow disperser and the auxiliary air flow disperser are respectively positioned at two sides of the drying cavity;
the temperature of the drying gas provided by the main gas pipe is greater than that of the drying gas provided by the auxiliary gas pipe.
2. The coal slurry drying treatment device as recited in claim 1, wherein the coal slurry drying treatment device is adapted for low-rank coal slurry.
3. The coal slime drying treatment device according to claim 1, wherein the concentration unit comprises a thickener, an underflow pipe and a concentration underflow pump, a discharge port of the thickener is connected with a feed port of the filter pressing unit through the underflow pipe, and the concentration underflow pump is arranged on the underflow pipe.
4. The coal slime drying treatment device according to claim 3, wherein the underflow concentration of the thickener is 350 g/L-400 g/L.
5. The coal slime drying treatment device according to claim 1, wherein the filter pressing unit comprises a filter press and a filter pressing motor for providing power for the filter press, and the discharge port of the filter press is connected with the feeding pipe of the strip making drying unit.
6. The coal slime drying device as set forth in claim 5, wherein the feeding pressure of the filter press is 0.11 MPa-0.12 MPa, and the filter press pressure of the filter press is 0.10 MPa-0.20 MPa.
7. The coal slime drying device of claim 5, wherein the discharge port of the filter press is connected with the feeding pipe of the strip making and drying unit through a transmission assembly.
8. The coal slime drying device of claim 7, wherein the transmission assembly comprises a belt, a belt roller, a belt motor and a belt bracket, the two ends of the belt are respectively sleeved on the partial outer peripheral surface of the belt roller, the two ends of the belt are rotatably connected with the belt through the belt roller, the belt motor is used for driving the belt roller to rotate, and the discharge hole of the filter press is located above the belt.
9. The coal slime drying processing device as set forth in any one of claims 1 to 8, further comprising a heat recovery unit connected to the flue gas outlet of the drying cylinder.
10. The coal slime drying device of claim 9, wherein the heat recovery unit comprises an evaporator, a compressor, a condenser, a liquid storage device and an expansion valve which are connected in sequence, and the evaporator is connected with the smoke outlet of the strip making drying unit.
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