CN114198984B

CN114198984B - Lignite multistage drying system

Info

Publication number: CN114198984B
Application number: CN202111587000.2A
Authority: CN
Inventors: 康健
Original assignee: Hebei GEO University
Current assignee: Hebei GEO University
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-10-04
Anticipated expiration: 2041-12-23
Also published as: CN114198984A

Abstract

The invention belongs to the technical field of lignite drying, and provides a lignite multistage drying system which comprises a rack and a filter box fixed on the rack, wherein a conveying mechanism is arranged in the filter box, a driving piece for driving the conveying mechanism is fixedly connected to the rack, a plurality of filter holes are formed in the bottom of the filter box, a collecting box positioned below the filter box is fixedly connected to the rack, and the collecting box is communicated with the filter box through the filter holes; the filter box is communicated with a drying box, a combustion box is arranged below the drying box, and the combustion box is communicated with a hot air pipe communicated with the drying box; be provided with a plurality of baffles in the drying cabinet, the baffle separates the drying cabinet for a plurality of drying chamber, is provided with the drying board of slope in the drying chamber, is connected with power unit on the drying board, and one side that the hot-air pipe was kept away from to the drying cabinet is provided with the export, and the cyclone who communicates with the drying cabinet is installed to the top of export. The multi-stage drying device is simple in structure, and can be used for drying lignite in multiple stages, improving the drying efficiency of lignite and achieving the purposes of energy conservation and emission reduction.

Description

Lignite multistage drying system

Technical Field

The invention belongs to the technical field of lignite drying, and particularly relates to a lignite multistage drying system.

Background

Lignite, also known as firewood coal (wood coal), is the lowest coalification mineral coal, and is a brownish-black, dull low-rank coal between peat and bituminous coal.

In recent years, as the thermal power generation cost rises year by year, the profit of the whole industry is obviously reduced, and the thermal power plant tries to reduce the power generation cost by using the original unit to mix and burn the low-price lignite, thereby improving the benefit of enterprises. However, high-moisture lignite cannot be co-fired in a boiler equipped with a medium-speed coal mill and a ball mill, and the main problem is that the high-moisture lignite cannot be milled into powder, so that the lignite needs to be dried in order to be utilized.

Disclosure of Invention

The invention aims to provide a multi-stage drying system for lignite, which is used for carrying out multi-stage drying on lignite and improving the drying efficiency of lignite.

In order to achieve the purpose, the invention adopts the following technical scheme: a multi-stage lignite drying system comprises a rack and a filter box fixed on the rack, wherein a conveying mechanism is arranged in the filter box, a driving piece for driving the conveying mechanism is fixedly connected to the rack, a plurality of filter holes are formed in the bottom of the filter box, a collecting box located below the filter box is fixedly connected to the rack, and the collecting box is communicated with the filter box through the filter holes;

the filter box is communicated with a drying box, a combustion box is arranged below the drying box, and the combustion box is communicated with a hot air pipe communicated with the drying box;

be provided with a plurality of baffles in the drying cabinet, the baffle separates the drying cabinet for a plurality of drying chamber, is provided with the drying board of slope in the drying chamber, is connected with power unit on the drying board, and one side that the hot-air pipe was kept away from to the drying cabinet is provided with the export, and the cyclone who communicates with the drying cabinet is installed to the top of export.

In a preferred embodiment of the invention, the conveying mechanism comprises a rotating shaft positioned in the filter box, a helical blade is arranged on the rotating shaft, and the rotating shaft and the helical blade form a packing auger.

In a preferred embodiment of the invention, the power mechanism comprises a power shaft vertically matched with the drying box in a sliding manner, one end of the power shaft, far away from the drying plate, is coaxially and threadedly connected with a sleeve, a driven gear is coaxially and fixedly connected with the sleeve, a power motor is fixedly connected with the rack, a main gear meshed with the driven gear is coaxially and fixedly connected with an output shaft of the power part, sliding blocks are fixedly connected with two sides of the drying plate, and a sliding groove vertically matched with the sliding blocks is formed in the partition plate.

In a preferred embodiment of the invention, the air outlet of the cyclone dust collector is communicated with a pump assembly, the pump assembly is communicated with a hot air pipe, the combustion box is communicated with a combustion pipe, and the hot air pipe is spirally arranged on the combustion pipe.

In a preferred embodiment of the invention, the hot air pipe is communicated with a plurality of auxiliary heat pipes, and the plurality of auxiliary heat pipes are respectively and fixedly arranged on the filter box and the collecting box.

In a preferred embodiment of the invention, the dust removal opening of the cyclone is connected to a collection bag.

In a preferred embodiment of the invention, the hot gas pipe is fixedly mounted on the drying box.

The principle and the beneficial effects of the invention are as follows: (1) In this scheme, carry the brown coal to the drying cabinet in through conveying mechanism, in transportation process, carry out moisture through crossing filtration hole and collecting box and filter the brown coal, reduce the moisture in the brown coal to the drying of follow-up brown coal is convenient for.

When carrying out the drying to the brown coal, carry the natural gas burning through the combustion tube in to the combustion box, the produced high temperature of natural gas burning can directly be dried to the brown coal in the drying cabinet, and simultaneously, the high temperature gas of natural gas burning enters into drying cabinet through the steam pipe and dries the brown coal, so reaches the purpose of drying the brown coal.

(2) In the scheme, a plurality of drying cavities are formed in the drying box, so that the lignite is continuously dried when the lignite is transported by utilizing the power mechanism and the drying plate.

(3) In this scheme, with the lignite from being close to the dry intracavity of steam pipe and transporting to the exit, in the transportation, the lignite is slided to next dry chamber on the drying plate for the area of contact of lignite dispersion increase lignite and steam improves the drying effect to the lignite.

(4) In this scheme, steam can contain a large amount of particulate matters behind the brown coal, get rid of through cyclone, then comparatively clean gas passes through the hot-blast main and assists the heat pipe to discharge, in order to reduce gaseous harm nature, steam in the hot-blast main can carry out the heat exchange to the gas in the combustion tube simultaneously, reduce the heat absorption capacity of natural gas to the combustion box in, the natural gas of being convenient for burns, and simultaneously, the steam in assisting the hot-blast main can carry out preliminary preheating drying to the brown coal in the rose box, subsequent drying of being convenient for, reach multistage dry purpose. Therefore, additional heat is not needed to preheat the lignite, and additional heat energy is not needed to preheat the natural gas, so that the aims of energy conservation and emission reduction are achieved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a filter box in an embodiment of the present application.

Fig. 2 is a schematic structural view of a drying box in the embodiment of the present application.

Reference numerals in the drawings of the specification include: the device comprises a combustion box 11, a hot air pipe 12, a feeding pipe 13, a drying box 14, a partition plate 15, an air outlet 16, an outlet 17, a closing plate 21, a sleeve 22, a driven gear 23, a main gear 24, a power motor 25, a power shaft 26, a drying plate 27, a cyclone dust collector 31, a collecting bag 32, an air pump 33, a hot air pipe 34, a filter box 41, an auxiliary hot pipe 42, a rotating shaft 43, a spiral blade 44, a driving motor 45, a filter hole 46 and a collecting box 47.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

Examples

Basically, as shown in fig. 1 and fig. 2, a lignite multistage drying system comprises a frame (not shown in the figure), a filter box 41 is fixedly connected to the frame through bolts, a conveying mechanism is arranged in the filter box 41, the conveying mechanism comprises a rotating shaft 43 rotatably connected with the filter box 41, a helical blade 44 is fixed on the rotating shaft 43, the rotating shaft 43 and the helical blade 44 form a packing auger, a driving part is fixedly connected to the frame, the driving part is a driving motor 45, and an output shaft of the driving motor 45 is coaxially and fixedly connected with the rotating shaft 43. One side that rose box 41 is close to driving motor 45 is provided with into brown coal mouth, and one side that driving motor 45 was kept away from to rose box 41 is provided with out the brown coal mouth, and open the bottom of rose box 41 has a plurality of filtration pores 46, and bolt fixedly connected with collecting box 47 in the frame, collecting box 47 are through filtration pore 46 and rose box 41 intercommunication.

In this embodiment, the lignite is put into the filter box 41 through the lignite inlet, and then the driving motor 45 drives the rotating shaft 43 and the helical blade 44 to rotate, so as to convey the lignite to the lignite outlet, and water in the lignite enters the collecting box 47 through the filtering of the filtering holes 46, thereby reducing water in the lignite.

As shown in fig. 2, in this embodiment, a combustion box 11 is mounted on a rack, a combustion pipe is communicated with one side of the combustion box 11, a hot air pipe 12 is communicated with the other side of the combustion box 11, a drying box 14 is fixedly connected to the combustion box 11 through a bolt, the right side of the drying box 14 is communicated with the hot air pipe 12, the hot air pipe 12 is fixedly mounted on the drying box 14, a lignite outlet of a filter box 41 is communicated with a feeding pipe 13, the feeding pipe 13 is communicated with the right side of the drying box 14, that is, the communicating position of the feeding pipe 13 is the same as the hot air pipe 12. In this embodiment, the combustion pipe sends the mixed gas of natural gas and air into combustion box 11 and burns, and the high temperature high fever that the natural gas burning produced directly heats drying cabinet 14, and then carries out the drying to the brown coal in drying cabinet 14, and the high temperature gas who produces passes through hot-blast main 12 and enters into drying cabinet 14 in, further dries the brown coal to take away moisture. Because the hot air pipe 12 is fixedly connected to the drying box 14, the hot air pipe 12 can keep the drying box 14 warm to some extent.

In this embodiment, be fixed with a plurality of baffles 15 in drying cabinet 14, a plurality of baffles 15 divide drying cabinet 14 into a plurality of drying chamber, and the drying chamber on the leftmost is ejection of compact chamber to it has the export 17 with ejection of compact chamber intercommunication to open on the drying cabinet 14. All be provided with the drying board 27 of slope in other drying chamber, the low right-hand member height of the 27 left ends of drying board, the equal fixedly connected with slider in both sides of drying board 27, all open on the baffle 15 have with the vertical sliding connection's of slider spout. A power shaft 26 is fixedly connected to the drying plate 27 through a bolt, the upper end of the power shaft 26 penetrates through the drying box 14, a closing plate 21 is rotatably matched to the upper portion of the power shaft 26, the closing plate 21 can reduce a gap between the power shaft 26 and the drying box 14, a sleeve 22 rotatably matched with the closing plate 21 is sleeved on the upper end of the power shaft 26, the sleeve 22 is in threaded connection with the power shaft 26, a driven gear 23 is coaxially and fixedly connected to the sleeve 22, a main gear 24 is meshed with the driven gear 23, a power motor 25 fixed to the rack is arranged on the main gear 24, and an output shaft of the power motor 25 is coaxially and fixedly connected with the main gear 24.

In this embodiment, the lignite in the drying box 14 is conveyed in the following manner: from right to left, the power motor 25 drives the main gear 24 and the secondary gear 23 to rotate, the secondary gear 23 drives the sleeve 22 to rotate, the drying plate 27 is limited by the sliding chute and the sliding block, the power shaft 26 only can drive the drying plate 27 to move upwards, and the lignite on the drying plate 27 falls towards the next drying cavity under the action of gravity due to the inclination of the drying plate 27, so that transportation is achieved, and the lignite is conveyed into the discharging cavity. In the conveying process, the lignite falls into the next drying cavity, so that the lignite is dispersed and fully contacted with hot air in the drying box 14, the drying effect is improved, the lignite is repeatedly conveyed, the continuous drying purpose is achieved, and the lignite drying efficiency is improved.

In this embodiment, a cyclone dust collector 31 is fixedly connected to the drying box 14 through a bolt, the cyclone dust collector 31 is located above the outlet 17, an air outlet of the cyclone dust collector 31 is communicated with an air pump 33 fixed on the frame, a dust removing opening of the cyclone dust collector 31 is communicated with a collecting cloth bag, the air pump 33 is communicated with a hot air pipe 34, the hot air pipe 34 is spirally arranged along the combustion pipe, the hot air pipe 12 is communicated with a plurality of auxiliary heat pipes 42, parts of the auxiliary heat pipes 42 are fixedly installed on the filtering box 41, and parts of the auxiliary heat pipes 42 are fixedly installed on the collecting box 47.

In this embodiment, under the action of the air pump 33, the hot air after drying the lignite enters the cyclone 31, the particulate matters in the air are removed by the cyclone 31, and then the hot air is conveyed to the hot air pipe 34 through the air pump 33, the hot air in the hot air pipe 34 heats the air (natural gas) in the combustion pipe, so that the heat absorption caused by combustion of the natural gas is reduced, that is, the heat energy consumption in the combustion box 11 can be reduced, then the air in the hot air pipe 34 enters the auxiliary heat pipe 42 on the filter box 41, and the lignite in the filter box 41 is preheated by the auxiliary heat pipe 42. The gas in the auxiliary heat pipe 42, which is treated by the cyclone 31 to reduce the particles therein, can be discharged into the existing air cleaning equipment for treatment and then discharged into the air.

In this embodiment, because the lignite is dried and then discharged from the outlet 17, and the cyclone 31 performs gas and particulate matter separation, the separated particulate matter falls from the collection bag 32 to the outlet 17, and is mixed with the lignite discharged from the outlet 17, and the lignite is transported away while being transported away together with the particulate matter, thereby avoiding the treatment of the particulate matter.

In this embodiment, the lignite is dried by the heat generated by burning the natural gas, and compared with coal burning, combustion pollutants are reduced, and the cost is reduced. Meanwhile, the waste heat of the combustion gas is utilized for multiple times, so that the purposes of energy conservation and emission reduction are achieved.

In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-stage lignite drying system is characterized by comprising a rack and a filter box fixed on the rack, wherein a conveying mechanism is arranged in the filter box, a driving piece for driving the conveying mechanism is fixedly connected to the rack, a plurality of filter holes are formed in the bottom of the filter box, a collecting box located below the filter box is fixedly connected to the rack, and the collecting box is communicated with the filter box through the filter holes;

the filter box is communicated with a drying box, a combustion box is arranged below the drying box, the combustion box is communicated with a hot air pipe communicated with the drying box, and the hot air pipe is arranged at the same side of the filter box;

a plurality of clapboards are arranged in the drying box, the drying box is divided into a plurality of drying cavities by the clapboards, the drying cavity on the leftmost side is a discharging cavity, an inclined drying plate is arranged in the drying cavity, the left end of the drying plate is low, the right end of the drying plate is high, a power mechanism is connected to the drying plate, an outlet and an air outlet are arranged on one side of the drying box, which is far away from the hot air pipe, and a cyclone dust collector communicated with the air outlet of the drying box is arranged above the outlet;

the conveying mechanism comprises a rotating shaft positioned in the filter box, a helical blade is arranged on the rotating shaft, and the rotating shaft and the helical blade form a packing auger;

the power mechanism comprises a power shaft which is vertically matched with the drying box in a sliding manner, one end of the power shaft, far away from the drying plate, is coaxially and threadedly connected with a sleeve, a driven gear is coaxially and fixedly connected onto the sleeve, a power motor is fixedly connected onto the rack, a main gear meshed with the driven gear is coaxially and fixedly connected onto an output shaft of the power part, sliding blocks are fixedly connected onto two sides of the drying plate, and sliding grooves which are vertically matched with the sliding blocks in a sliding manner are formed in the partition plate;

a gas outlet of the cyclone dust collector is communicated with a pump assembly, the pump assembly is communicated with a hot air pipe, a combustion box is communicated with a gas pipe, and the hot air pipe is spirally arranged on the combustion pipe;

the hot-blast main is connected with several auxiliary heat pipes, which are fixed on the filter box and the collecting box.

2. The lignite multistage drying system of claim 1, wherein a dust removal port of the cyclone dust collector is communicated with a collection bag.

3. The lignite multi-stage drying system of claim 2, wherein the hot air pipe is fixedly installed on the drying box.