WO2013083092A1 - Équipement de séchage du charbon pulvérisé et procédé de séchage associé - Google Patents

Équipement de séchage du charbon pulvérisé et procédé de séchage associé Download PDF

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Publication number
WO2013083092A1
WO2013083092A1 PCT/CN2012/086212 CN2012086212W WO2013083092A1 WO 2013083092 A1 WO2013083092 A1 WO 2013083092A1 CN 2012086212 W CN2012086212 W CN 2012086212W WO 2013083092 A1 WO2013083092 A1 WO 2013083092A1
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WIPO (PCT)
Prior art keywords
pulverized coal
layer
heat exchange
gas
exchange unit
Prior art date
Application number
PCT/CN2012/086212
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English (en)
Chinese (zh)
Inventor
陈华金
Original Assignee
Chen Huajin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2011205114424U external-priority patent/CN202346955U/zh
Priority claimed from CN2011104081998A external-priority patent/CN102492432A/zh
Application filed by Chen Huajin filed Critical Chen Huajin
Publication of WO2013083092A1 publication Critical patent/WO2013083092A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F26B17/1433—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material
    • F26B17/1441—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material the members or bodies being stationary, e.g. fixed panels, baffles, grids, the position of which may be adjustable
    • F26B17/1458—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material the members or bodies being stationary, e.g. fixed panels, baffles, grids, the position of which may be adjustable consisting of perforated panels or baffles; consisting of grids

Definitions

  • the invention relates to the field of coal drying technology, in particular to a pulverized coal drying device and a drying method. Background technique
  • the moisture of coal is the quantity index of coal and the quality index.
  • the moisture of coal is increased and the calorific value is reduced.
  • the calorific value of coal produced by many coal mines, especially lignite, does not meet the quality requirements of users. Some of them have low calorific value.
  • the transportation distance is long, the transportation cost is high, the economic efficiency is low, and the coal mine cannot operate.
  • the technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a pulverized coal drying method for drying pulverized coal having a particle diameter of 20 mm or less to improve the drying efficiency of pulverized coal.
  • Another object of the present invention is to provide a pulverized coal drying apparatus which realizes the above pulverized coal drying method.
  • a pulverized coal drying method comprising the steps of: installing a downwardly inclined pulverized coal carrier plate layer by layer in a pulverized coal drying chamber for pulverized coal drying;
  • the plurality of pulverized coal carrying plates are configured to form a plurality of multi-layer heat exchange units connected to each other, wherein each of the heat exchange units has a pulverized coal accumulation area and a gas flow area based on the pulverized coal carrying plate;
  • Pulverized coal is placed into the heat exchange unit of each layer from top to bottom, so that the pulverized coal layer of each layer of the heat exchange unit is stacked on the pulverized coal layer;
  • the upper and lower layers of pulverized coal in the gas flow region of each layer of the heat exchange unit are heated and dried by the heat carrier gas distributed in the gas flow region of each layer of the heat exchange unit to produce dry pulverized coal.
  • the step of heating and drying the upper and lower layers of pulverized coal in the gas flow region of each layer of the heat exchange unit comprises: burning air and gas into the gas flow region of part or all of the heat exchange unit to generate a heat carrier gas,
  • the hot carrier gas is injected from each layer of the heat exchange unit and passes through the heat exchange unit of each layer from bottom to top, according to The characteristics of different pulverized coals, adjusting the amount of air and gas injected into the gas flow area of each layer, maintaining the temperature of the entire pulverized coal drying chamber between 100 ° C and 300 ° C; the gas flow area of each layer of heat exchange unit
  • the hot carrier gas is heated and dried by the pulverized coal carrier plate and its air gap on the upper layer of the pulverized coal, and the pulverized coal underneath is directly heated and dried to remove water and generate water vapor.
  • the heat carrier gas is produced by combustion of gas and air sprayed into the gas flow regions of the heat exchange units of the various layers.
  • the steps of drying the pulverized coal by the heat exchange unit by using the hot carrier gas include: the heat carrier gas passes through the heat exchange unit of each layer from bottom to top, so that the temperature in the entire drying chamber is maintained at 100 ° C - 300 ° C. between.
  • the hot carrier gas passes through the air gap of the pulverized coal carrier plate and the heat conduction of the pulverized coal carrier plate to heat and dry the pulverized coal located in the upper layer to generate water vapor, and directly heats and dries the pulverized coal under the water to produce water. Vapor.
  • the gas to be discharged and the water vapor are discharged upward through the upper exhaust port; the pulverized coal enters each layer of the heat exchange unit from top to bottom, is dried and dehydrated, and is discharged from the lower discharge channel to produce dry pulverized coal. .
  • the step of installing the downwardly inclined pulverized coal carrying plate layer by layer comprises: installing a plurality of pulverized coal carrying plates with a shape of a triangular or curved shape with a ventilating air gap layer by layer on the side of the drying chamber;
  • the pulverized coal is placed, the pulverized coal is descended by the pulverized coal bearing plate, and the inclined pulverized coal layer is accumulated on the pulverized coal carrying plate of each layer of the heat exchange unit, thereby forming a gas flow on the inclined pulverized coal layer.
  • the pulverized coal carrier plate has a plurality of ventilating air gaps for pulverized coal pyrolysis from the pulverized coal layer on the pulverized coal carrier plate, and the pulverized coal cannot pass through the air gap during the downward process. And the hot carrier gas flowing from the bottom to the top can go up through the air gap.
  • the step of installing the downwardly inclined pulverized coal carrying plate layer by layer comprises: installing a plurality of pulverized coal carrying plates with ventilating air gaps obliquely downwardly and obliquely on the side of the drying chamber, so that any two The lower end portion of the upper pulverized coal carrier plate of the adjacent pulverized coal carrier plate is adjacent to the upper end portion of the lower pulverized coal carrier plate; wherein, the lower end portion of each pulverized coal carrier plate is provided with an opening for the downward flow of pulverized coal;
  • the angle between the pulverized coal carrier plate and the drying chamber side is between 20 degrees and 70 degrees; wherein, the pulverized coal cannot descend through the air gap during the downward process, and the hot carrier gas flowing from the bottom to the top can pass through Said air gap up.
  • the step of installing the downwardly inclined pulverized coal carrier plate layer by layer comprises: installing a plurality of downwardly inclined pulverized coal carrier plates with ventilated air gaps in a staggered manner on the side of the pulverized coal drying chamber, The lower end portion of the upper pulverized coal carrier plate of any two adjacent pulverized coal carrier plates is adjacent to the upper end portion of the lower pulverized coal carrier plate; wherein the lower end portion of each pulverized coal carrier plate is opened for downward flow of pulverized coal An opening; wherein, the angle between the pulverized coal bearing plate and the pulverized coal drying chamber side is between 20 degrees and 70 degrees; wherein, the pulverized coal cannot descend through the air gap during the descending process, and the heat carrier flowing from the bottom to the top Gas can travel up through the air gap.
  • each layer of the heat exchange unit is surrounded by the upper surface of the upper pulverized coal carrying plate of the two adjacent pulverized coal carrying plates and the surface of the lower pulverized coal carrying plate and the surrounding pulverized coal inner wall Cheng, when pulverized,
  • Each layer of heat exchange unit utilizes its sloping pulverized coal carrier plate to deposit a sloping pulverized coal layer thereon and thereby form a gas flow region above the sloping pulverized coal layer.
  • the pulverized coal carrier plate of each layer of the heat exchange unit is provided with an air passage communicating with the gas flow region, and the gas flow region of each layer of the heat exchange unit is located through the upper air passage located thereon
  • the gas flow region of the upper heat exchange unit is in communication with the lower air passage underneath and the gas flow region of the lower heat exchange unit, wherein the air passage causes the heat carrier gas to rise up to each layer by layer
  • the pulverized coal layer of the unit is heated and dried to produce water vapor, and finally discharged from the upper exhaust port.
  • the air passage of one or more heat exchange units located in the upper part of the pulverized coal drying chamber is provided with an air passage valve, and when the gas to be discharged entrains a lot of dust, one or more air passage valves are closed, forcing The gas passes through the air gap of the pulverized coal carrier plate, and the dust in the gas to be discharged is filtered by the undried pulverized coal layer accumulated on the pulverized coal carrier plate.
  • the air passage of one or more heat exchange units located in the lower portion of the pulverized coal drying chamber is provided with an air passage valve for opening and closing the air passage valve according to the magnitude of the air pressure entering the drying chamber.
  • the air passage is closed, the hot carrier gas is forced to pass through the ventilating air gap of the pulverized coal carrier plate, so that the heat carrier gas and the pulverized coal are more heat exchanged, and the production efficiency is improved.
  • a pulverized coal drying apparatus comprising a plurality of pulverized coal drying chambers, each pulverized coal drying chamber comprising:
  • An interconnected multi-layer heat exchange unit comprising the plurality of pulverized coal carrier plates, each of which has a pulverized coal accumulation region and a gas flow region on the pulverized coal carrier plate to form pulverized coal and gas Flowable pulverized coal drying environment;
  • a cloth opening disposed at the top of the pulverized coal drying chamber for discharging the pulverized coal into the heat exchange unit of each layer from top to bottom, so that the pulverized coal layer of each layer of the heat exchange unit is stacked with an obliquely distributed pulverized coal layer ;
  • a heat carrier gas generating device for generating a heat carrier gas respectively entering the pulverized coal drying chamber from each layer of the heat exchange unit, the heat carrier gas flowing from the bottom to the top, and adjusting the gas flow region of each layer according to the characteristics of different pulverized coal a quantity of air and gas entering, forming a drying temperature between 100 ° C and 300 ° C in the pulverized coal drying chamber, so that each layer of the heat exchange unit separately performs drying treatment on each of the pulverized coal layers by using the heat carrier gas;
  • a curved discharge channel disposed below the pulverized coal drying chamber.
  • the curved discharge channels between the adjacent two pulverized coal drying chambers are curved gas flow passages, and the gas and air are cooled from the gas flow passages before entering the gas flow regions of the heat exchange units to cool the dry pulverized coal.
  • the gas and air itself were preheated.
  • the pulverized coal carrying plate is provided with a plurality of ventilating air gaps for pulverizing the pulverized coal layer on the pulverized coal carrying plate from below; and each pulverized coal carrying plate is opened at the lower end.
  • the heat exchange unit uses the inclined pulverized coal carrier plate to accumulate the inclined pulverized coal layer thereon, and forms a gas flow region above the inclined pulverized coal layer; wherein, the angle between the pulverized coal carrier plate and the pulverized coal drying chamber side is 20 degrees Between 70 degrees; wherein, the pulverized coal cannot descend through the air gap during the downward process, and the hot carrier gas flowing from the bottom to the upper direction can go up through the air gap.
  • each of the heat exchange units of the layer is surrounded by a lower surface of the upper pulverized coal carrying plate of the two adjacent pulverized coal carrying plates and a pulverized coal drying inner wall of the lower pulverized coal carrying plate surface, and
  • each layer of the heat exchange unit accumulates a sloping pulverized coal layer thereon by its inclined pulverized coal carrier plate, and thereby forms a gas flow region above the sloping pulverized coal layer.
  • the pulverized coal carrier plate of each layer of the heat exchange unit is provided with an air passage communicating with the gas flow region thereof, and the gas flow region of each layer of the heat exchange unit passes through the upper air passage located thereon and the heat exchange unit located at the upper layer thereof
  • the gas flow regions are in communication and communicate with the gas flow region located in the lower heat exchange unit through the lower air passage located thereunder.
  • the air passage of the one or more heat exchange units located in the upper part of the pulverized coal drying chamber is provided with an air passage valve, and when the gas to be discharged entrains a lot of dust, the one or more air passage valves are closed, forcing the gas from the pulverized coal carrying board The air gap passes through, and the dust in the gas to be discharged is filtered by the undried pulverized coal layer accumulated on the pulverized coal carrier board.
  • the air passage of the one or more heat exchange units located in the lower portion of the pulverized coal drying chamber is provided with an air passage valve, and the air passage valve is opened and closed according to the magnitude of the air pressure entering the drying chamber.
  • the air passage is closed, the heat carrier gas is forced to pass through the ventilating air gap of the pulverized coal carrier plate, so that the heat carrier gas and the pulverized coal are more heat exchanged, and the production efficiency is improved.
  • the pulverized coal having a particle size of 20 or less can be dried in a large amount, and the pulverized coal can be uniformly and thoroughly dried, and the drying treatment efficiency can be greatly improved. . DRAWINGS
  • Figure 1 is a schematic view of an internal heat type pulverized coal drying apparatus of the present invention
  • Figure 2 is a schematic view of the pulverized coal drying chamber shown in Figure 1;
  • Figure 3 is a left side view of Figure 2;
  • Figure 4 is a view taken along line C of Figure 2;
  • Figure 5 is a schematic view of the pulverized coal drying chamber after being placed into the pulverized coal;
  • Figure 6a is a schematic view showing a structure and distribution of an air gap on a pulverized coal carrier plate of a pulverized coal drying chamber
  • Figure 6b is another schematic diagram of the structure and distribution of the air gap on the pulverized coal carrier plate of the pulverized coal drying chamber
  • Figure 6c is another schematic diagram of the structure and distribution of the air gap on the pulverized coal carrier plate of the pulverized coal drying chamber.
  • a pulverized coal drying apparatus of the present invention including a pulverized coal drying furnace 1, which is a cloth opening 2, an exhaust port 10, and a plurality of pulverized coal drying chambers from top to bottom. 8 and the coal outlet 9.
  • the top of the pulverized coal drying furnace 1 is the cloth mouth 2, and the cloth feeder 2 has a feeding cart for the cloth.
  • a coal outlet 9 and a coal feeder 19 for collecting and discharging the dried pulverized coal.
  • the pulverized coal drying furnace 1 has an outer partition wall and a plurality of inner partition walls 21, and each pulverized coal drying chamber 8 is surrounded by a partition wall, for example, the outer pulverized coal drying chamber 8 is surrounded by an outer partition wall and an inner partition wall.
  • the pulverized coal drying chamber 8 located inside is enclosed by two inner partition walls.
  • a plurality of pulverized coal bearing plates 18 are alternately arranged one by one in each of the two partition walls in each of the pulverized coal drying chambers 8, thereby forming a multilayer heat exchange unit 81 in the pulverized coal drying chamber 8 (see Fig. 3).
  • each pulverized coal drying chamber 8 a curved discharge passage 5, a gas flow passage 6 between the discharge passages 5, an air and gas inlet port 7, and a heating device are provided, as in the pulverized coal drying chamber 8. It is used to burn the heated burner 16 and the gas passage 15.
  • the present invention mainly develops a pulverized coal drying chamber 8 suitable for pulverized coal drying, and a method for drying the pulverized coal by using the pulverized coal drying chamber 8.
  • the pulverized coal drying apparatus including the plurality of pulverized coal drying chambers 8 of the present invention and the method of pulverizing the pulverized coal in the pulverized coal drying chamber 8 will be described in detail below mainly with reference to Figs. 1 to 6 .
  • Fig. 2 is a view showing the structure of the pulverized coal drying chamber 8 of the present invention shown in Fig. 1.
  • the pulverized coal drying chamber 8 of the present invention comprises:
  • An interconnected multi-layer heat exchange unit 81 composed of a plurality of pulverized coal carrier plates 18 each having a pulverized coal accumulation region on the pulverized coal carrier plate 18 (corresponding to the powder shown in FIG. 5) a coal seam 811 ) and a gas flow region 812 to form a pulverized coal and gas flowable pulverized coal drying environment, wherein the gas flow regions of each layer of the heat exchange unit are in communication with the gas flow regions of the adjacent heat exchange units;
  • a cloth opening 82 disposed at the top of the pulverized coal drying chamber for discharging the pulverized coal into the heat exchange unit 81 of each layer from top to bottom, and when pulverized coal is used, the squeezing support between the pulverized coal is utilized
  • An obliquely distributed pulverized coal layer 811 (shown in FIG. 5) is deposited on the pulverized coal accumulation area of each layer of the heat exchange unit 81, and the pulverized coal seam layer is formed thereby Above the gas flow region 812 (shown in Figure 5);
  • a heat carrier gas generating device such as the burner 16 shown in Fig. 1, for generating a heat carrier gas entering the pulverized coal drying chamber 8 from each layer of the heat exchange unit, the heat carrier gas flowing from the bottom to the top, according to different pulverized coal
  • the characteristics of the air and gas injected into the gas flow regions of each layer are adjusted to form a drying temperature between 100 ° C and 300 ° C in the pulverized coal drying chamber 8 so that the heat exchange units 81 of each layer utilize the heat carrier gas. Drying each pulverized coal layer 811 separately;
  • the curved discharge channel 5 disposed under the pulverized coal drying chamber is provided with a gas flow passage 6 between any two discharge passages 5, and the gas or air passes from the gas flow passage 6 into the gas flow region of each heat exchange unit.
  • the dry pulverized coal is cooled while the gas or air itself is preheated.
  • each of the pulverized coal carrier plates 18 is provided with a plurality of ventilating air gaps 181 for pulverizing the pulverized coal layer 811 thereon from below.
  • the venting air gap 181 is preferably an elongated through hole penetrating the pulverized coal carrier plate 18, or may be a short strip through hole as shown in FIG. 6b, or may be a tuck as shown in FIG. 6c.
  • the holes, three adjacent through holes as shown in Figs. 6b, 6c, are preferably distributed in a triangular shape on the pulverized coal carrier plate 18 for uniform heat exchange. Among them, the pulverized coal cannot descend through the air gap 181 during the downstream process, and the heat carrier gas flowing from the bottom to the top can travel up through the air gap 181.
  • each of the pulverized coal carrier plates 18 has an opening 182 for downward flow of pulverized coal, and a lower end portion of the upper pulverized coal carrier plate of any two adjacent pulverized coal carrying plates 18. It is close to the upper end of the lower pulverized coal carrier plate, and the angle between the pulverized coal carrier plate 18 and the inner side of the pulverized coal drying chamber 8 is between 20 and 70 degrees.
  • each layer of the heat exchange unit 81 of the present invention is composed of the upper surface of the upper pulverized coal carrying plate of the two adjacent pulverized coal carrying plates 18 and the pulverized coal on the surface of the lower pulverized coal carrying plate and its surroundings.
  • the inner wall of the drying chamber is surrounded; when the pulverized coal is disposed, each layer of the heat exchange unit 81 accumulates the inclined pulverized coal layer 811 thereon by its inclined pulverized coal carrier plate 18, and forms a gas flow region 812 located above the inclined pulverized coal layer. .
  • the pulverized coal carrier plate 18 of each layer of the heat exchange unit 81 of the present invention is provided with a gas flow region thereof.
  • the gas flow region 812 of each layer of the heat exchange unit 81 of the present invention communicates with the gas flow region of the upper heat exchange unit through the upper air passage located thereon, through the lower air passage located therebelow It is in communication with a gas flow region located in its lower heat exchange unit.
  • the present invention may be provided with a plurality of air passages passing through the respective pulverized coal carrying plates 18 in order from top to bottom, and the air passage portions between adjacent pulverized coal carrying plates 18
  • Each of the air passages communicating with the gas flow region 812 of the layer heat exchange unit 81 is opened, through which the heat carrier gas flows from the bottom to the heat exchange unit of each layer.
  • the pulverized coal layer flowing from top to bottom of each heat exchange unit is dried and heated by the air passage.
  • the air passage of one or more heat exchange units 81 located at the upper portion of the pulverized coal drying chamber 8 is provided with an air passage valve, and when the gas to be discharged entrains a lot of dust, one or more air passage valves are closed to force the gas to be carried from the pulverized coal.
  • the air gap 181 of the plate 18 passes through, and the dust in the gas to be discharged is filtered by the undried pulverized coal layer 811 deposited on the pulverized coal carrier plate 18.
  • an air passage valve is provided in the air passage of one or more heat exchange units 81 located at the lower portion of the pulverized coal drying chamber 8, and the air passage valve is opened and closed according to the magnitude of the air pressure entering the drying chamber.
  • the air passage is closed, the heat carrier gas is forced to pass through the venting air gap 181 of the pulverized coal carrying plate 18, so that the heat carrier gas and the pulverized coal are more heat exchanged, and the production efficiency is improved.
  • a plurality of pulverized coal bearing plates with ventilated air gaps installed in layers in the pulverized coal drying chamber 8 may also be triangular or curved.
  • the pulverized coal is descended by the pulverized coal bearing plate, and the inclined pulverized coal layer is accumulated on the pulverized coal carrying plate of each layer of the heat exchange unit, thereby forming a stratified pulverized coal layer a gas flow region; wherein the pulverized coal carrier plate has a plurality of ventilation air gaps for drying and heating the pulverized coal layer on the pulverized coal carrier plate from below, and the pulverized coal cannot pass through the air gap during the downward process And the hot carrier gas flowing from the bottom to the top can go up through the air gap.
  • the pulverized coal drying method of the present invention will be described in detail below with reference to Fig. 5.
  • the pulverized coal drying method of the present invention comprises the following steps:
  • a downwardly inclined pulverized coal carrier plate 18 is installed layer by layer;
  • a plurality of pulverized coal carrier plates 18 are used to form interconnected multi-layer heat exchange units 81 each having a pulverized coal accumulation region on the pulverized coal carrier plate 18 (corresponding to the pulverized coal layer shown in Fig. 6) 811) and a gas flow region 812 to form a pulverized coal and gas flowable pulverized coal drying environment;
  • the pulverized coal is placed into the heat exchange unit 81 from the top to the bottom, so that the pulverized coal layer 811 is stacked on the pulverized coal accumulation area of each layer of the heat exchange unit 81;
  • the upper and lower pulverized coal layers 811 located in the gas flow region 812 of each layer of the heat exchange unit 81 are heated and dried by the heat carrier gas distributed in the gas flow regions of the plurality of heat exchange units, and dehydrated to generate water vapor to produce Dry pulverized coal;
  • the dry pulverized coal is cooled, and the cooled pulverized coal is pushed out from the bottom of the pulverized coal drying chamber by a pusher; and the gas to be discharged and the water vapor are discharged upward through the upper exhaust port.
  • the steps of performing heat drying treatment on the upper and lower pulverized coal layers 811 of the gas flow region 812 of each layer heat exchange unit 81 include: The hot carrier gas is injected from each layer of the heat exchange unit, and passes through the heat exchange unit 81 from bottom to top.
  • the amount of air and gas injected into the gas flow regions of each layer is adjusted, and the whole powder is
  • the temperature in the coal drying chamber 8 is maintained between 100 ° C and 300 ° C; the conduction of the hot carrier gas of the gas flow region 812 of each layer of the heat exchange unit 81 through the pulverized coal carrier plate 18 and its air gap 181
  • the pulverized coal located in the upper layer is heated and dried, and the pulverized coal located in the lower layer is directly heated and dried to remove water and generate water vapor.
  • the heat carrier gas is produced by combustion of gas and air which are injected into the gas flow region 812 of each layer of the heat exchange unit 81.
  • the step of drying the pulverized coal by the heat exchange unit 81 by using the hot carrier gas includes: the hot carrier gas passes through the heat exchange unit 81 of each layer from bottom to top, so that the temperature in the entire drying chamber is maintained at 100 ° C. Between TC (TC), the heat carrier gas passes through the air gap 181 of the pulverized coal carrier plate 18 and the heat transfer of the pulverized coal carrier plate 18 to heat and dry the pulverized coal located in the upper layer to generate water vapor, and directly The pulverized coal is directly heated and dried to produce water vapor.
  • TC TC
  • the gas to be discharged and the water vapor are discharged upward through the upper exhaust port 10; the pulverized coal enters each layer of the heat exchange unit 81 from top to bottom, and is baked. After dry dehydration, it is discharged from the lower discharge passage 5 to produce dry pulverized coal.
  • the step of installing the downwardly inclined pulverized coal carrier layer layer by layer comprises: installing a plurality of downwardly inclined ventilated air gaps 181 in a layered manner on the inner side of the pulverized coal drying chamber 8
  • the pulverized coal carrier plate 18 is such that the lower end portion of the upper pulverized coal carrier plate of any two adjacent pulverized coal carrier plates 18 is adjacent to the upper end portion of the lower pulverized coal carrier plate; wherein the lower end portion of each pulverized coal carrier plate 18 is There is an opening for the downward flow of pulverized coal.
  • each layer of the heat exchange unit 81 is composed of the upper surface of the upper pulverized coal carrying plate of the two adjacent pulverized coal carrying plates 18 and the pulverized coal on the surface of the lower pulverized coal carrying plate and its surroundings.
  • the inner wall of the drying chamber is surrounded.
  • each layer of the heat exchange unit 81 accumulates the inclined pulverized coal layer 811 thereon by its inclined pulverized coal carrying plate, and forms a gas flow region 812 located above the inclined pulverized coal layer.
  • the gas flow region 812 of each layer of the heat exchange unit 81 communicates with the gas flow region located in the upper heat exchange unit through the upper air passage located thereon, through the lower air passage located thereunder
  • the gas flow regions located in the lower heat exchange unit are in communication.
  • the air passage of the one or more heat exchange units 81 located at the upper portion of the pulverized coal drying chamber 8 is provided with an air passage valve, and when the gas to be discharged entrains a lot of dust, the one or more air passage valves are closed, The forced gas is passed through the air gap 181 of the pulverized coal carrier plate 18, and the dust in the gas to be discharged is filtered by the undried pulverized coal layer 811 deposited on the pulverized coal carrier plate 18.
  • the gas of one or more heat exchange units 81 located in the lower portion of the pulverized coal drying chamber 8 The airway valve is set to open and close the airway valve according to the size of the air pressure entering the drying chamber.
  • the air passage is closed, the heat carrier gas is forced to pass through the venting air gap 181 of the pulverized coal carrier plate 18, so that the heat carrier gas and the pulverized coal are more heat exchanged, and the production efficiency is improved.
  • the invention can carry out large-scale drying treatment of the pulverized coal having a particle diameter of less than 20 liters, can realize uniform and thorough drying of the pulverized coal, and can greatly improve the drying treatment efficiency.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

Fait l'objet de cette invention un équipement de séchage du charbon pulvérisé comprenant une pluralité de chambres de séchage (8) qui comprennent une pluralité de plaques porteuses de charbon pulvérisé (18), une ouverture en tissu (82), un générateur de gaz caloporteur et un canal de décharge de semi-coke en zigzag (5). Fait aussi l'objet de cette invention un procédé de séchage du charbon pulvérisé selon lequel les plaques porteuses de charbon pulvérisé (18) sont disposées inclinées vers le bas en couches superposées dans la chambre de séchage; la pluralité de plaques porteuses de charbon pulvérisé (18) constituent des unités d'échangeur de chaleur multicouche (81) en connexion mutuelle, chaque unité d'échangeur de chaleur multicouche (81) présente une zone d'accumulation de charbon pulvérisé (811) et une zone d'écoulement d'air (812) sur la plaque porteuse de charbon pulvérisé (18) ; le charbon pulvérisé pénètre, après avoir suivi un va-et-vient de haut en bas sur le tissu, l'unité d'échangeur de chaleur multicouche (81) ; grâce au tissu, la zone d'écoulement d'air (812) de chaque couche assure l'écoulement du gaz caloporteur de manière à sécher les couches de charbon pulvérisé.
PCT/CN2012/086212 2011-12-09 2012-12-07 Équipement de séchage du charbon pulvérisé et procédé de séchage associé WO2013083092A1 (fr)

Applications Claiming Priority (6)

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CN109307422A (zh) * 2018-10-15 2019-02-05 陈祖友 一种回流式颗粒物质烘干装置
CN110394226A (zh) * 2019-07-29 2019-11-01 沛县祥龙矿山机械配件有限公司 一种烟气预干燥褐煤钢球磨直吹式制粉系统
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CN102492432A (zh) * 2011-12-09 2012-06-13 新疆美特镁业有限公司 粉煤制焦设备及制焦方法
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CN109307422B (zh) * 2018-10-15 2020-10-13 江苏鑫世丰技术产权交易有限公司 一种回流式颗粒物质烘干装置
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US20220226889A1 (en) * 2021-01-21 2022-07-21 Toyota Jidosha Kabushiki Kaisha Fluid heating furnace and heating method

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