JP5634100B2 - Fluidized bed drying apparatus and fluidized bed drying equipment - Google Patents

Description

  The present invention relates to a fluidized bed drying apparatus that dries a material to be dried with a fluidized gas, and particularly relates to a fluidized bed drying device and a fluidized bed drying facility that can take measures against poor flow of the material to be dried.

  For example, in a lignite-fired boiler, lignite with a high water content is used as a fuel, and an impact-type pulverizer such as a beater mill is used for drying and pulverizing the lignite. When pulverizing using this beater mill, a part of high-temperature combustion gas of, for example, 1,000 ° C. from the lignite-fired boiler is used as the heat source, so the boiler efficiency is reduced. It is proposed to improve efficiency by using a system that recovers latent heat from the generated steam while drying the lignite in advance using a fluidized bed dryer before it is used and put into an impact crusher. ing.

  Conventionally, such a fluidized bed drying apparatus for drying an object to be dried such as lignite has a drying chamber which is a breathable dispersion plate having a plurality of openings at the bottom, and a chamber chamber located at the lower portion of the drying chamber. ing. That is, in this fluidized bed drying apparatus, fluidized gas (drying gas) is supplied from a wind box to a drying chamber through a perforated plate to dry the material to be dried while flowing (Patent Document 1 or 2). ).

Japanese Patent Laid-Open No. 04-13086 Japanese Patent Laid-Open No. 06-299176

  In the fluidized bed drying apparatus described in Patent Document 1 or 2, a mechanical stirring device is provided or the supply amount of fluidized gas at the inlet portion is adjusted so that the material to be dried does not cause flow failure at the inlet portion. However, in the case of a mechanical stirrer, wear of the stirrer may become a problem. On the other hand, adjustment of fluidized gas In such a case, the effect may be insufficient.

  Therefore, without taking such measures, it is eagerly desired to take measures that can facilitate good fluidization and promote fluidization in a fluidized bed drying apparatus.

  In view of the above problems, the present invention provides a fluidized bed drying device and a fluidized bed drying facility capable of promoting good fluidization and promoting fluidization in a fluidized bed drying device when a material to be dried is supplied. The task is to do.

The first aspect of the present invention to solve the above problems, in a fluidized bed dryer to dry in flowing brown coal supplied to the drying chamber by supplying fluidizing gas to the drying chamber, said drying An inlet portion for introducing lignite formed on the side wall of the chamber, an inclined portion formed on the bottom side surface of the side wall, and a liquefied coal introduction / fluidized bed region and a wake-side dried fluidized bed region in the drying chamber A partition wall having a gap formed by separating and supplying lignite from the upper side of the inclined portion, supplying fluidized gas from the bottom side to a region other than the inclined portion, and introducing / fluidized bed of lignite And the fluidized gas amount in the introduction / fluidized bed region is made larger than the gas amount in the dry fluidized bed region on the downstream side other than the introduction / fluidized bed region. In the device.

  A second invention is the fluidized bed drying apparatus according to the first invention, wherein an inclination angle of the inclined portion is not less than an angle of repose of the particles to be dried and not more than 90 °.

  A third invention is the fluidized bed drying apparatus according to the first or second invention, wherein a supply nozzle for supplying a stirring gas to the inclined portion is provided.

According to a fourth aspect of the present invention, there is provided the fluidized bed drying apparatus according to any one of the first to third aspects for drying an object to be dried having a high water content, and the superheated steam provided in the fluidized bed drying apparatus. A heat transfer member that removes moisture in the object to be dried and a generated steam line that discharges generated steam generated when the object to be dried is dried by the heat transfer member to the outside of the fluidized bed drying device; A dust collector that is interposed in the generated steam line and removes dust in the generated steam; a heat recovery system that is interposed downstream of the dust collector in the generated steam line and recovers the heat of the generated steam; A part of the generated steam from which dust is removed from the dust collector is branched, and a branch line that supplies the fluidized steam as fluidized steam into the fluidized bed drying device, and the material to be dried extracted from the fluidized bed drying device is cooled. Characterized by having a cooler In the drying equipment.

  According to the present invention, good mixing in a fluidized bed drying apparatus can be achieved, and fluidization can be promoted. As a result, even when a material to be dried having high adhesion is supplied, poor flow due to adhesion and aggregation of the material to be dried can be prevented.

FIG. 1 is a schematic diagram showing an example of fluidized bed drying equipment to which a fluidized bed drying apparatus according to an embodiment of the present invention is applied. FIG. 2-1 is a schematic diagram illustrating an example of a lignite-fired boiler to which the fluidized bed drying facility illustrated in FIG. 1 is applied. FIG. 2-2 is a schematic diagram illustrating an example of a combined coal gasification combined power generation system to which the fluidized bed drying facility illustrated in FIG. 1 is applied. FIG. 3 is a schematic view showing the fluidized bed drying apparatus of the first embodiment. FIG. 4 is a schematic view showing a fluidized bed drying apparatus according to the second embodiment. FIG. 5 is a schematic view showing a fluidized bed drying apparatus according to the third embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

The present embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of fluidized bed drying equipment to which the fluidized bed drying apparatus according to the present embodiment is applied.
As shown in FIG. 1, a fluidized bed drying facility 100 according to this embodiment includes a fluidized bed drying apparatus 102 that dries lignite coal 101 that is supplied from a supply hopper 120 and has a high moisture content, and fluidized bed drying. A heat transfer member (heating means) 103 that supplies superheated steam (for example, steam at 150 ° C.) A to the inside of the tubular body to remove moisture in the lignite 101, and lignite by the heat transfer member 103. the steam generated 104 generated when the 101 is dried and generated steam line L ₁ discharged to the outside of the fluidized bed dryer 102, is interposed in said generating steam line L _1, for removing dust in the steam generated 104 a dust collector 105, is interposed on the downstream side of the dust collecting apparatus 105 in generating steam line L _1, the heat recovery system 106 for recovering the steam generated 104 heat, dust from the dust collector 105 Tap a portion of the removed steam generation 104, a branch line L ₂ to be supplied to the fluidized bed dryer 102, the dried brown coal 108 withdrawn from the fluidized bed dryer 102 is cooled as a fluidizing steam 107 And a cooler 110 as a product charcoal 109.
Reference numeral 116 denotes a dispersion plate that rectifies the fluidized vapor 107 that is a fluidized gas.

In the fluidized bed drying facility 100, the lignite 101 is introduced into the fluidized bed drying apparatus 102 by the supply hopper 120 via the supply line L ₀ and is fluidized by the fluidized steam 107 separately introduced into the fluidized bed drying apparatus 102. Thus, the fluidized bed 111 is formed.

  The heat transfer member 103 described above is disposed in the fluidized bed 111. In the heat transfer member 103, 150 ° C. superheated steam A is supplied, and the lignite 101 is dried indirectly using the latent heat of the high temperature superheated steam A. The superheated steam A used for drying is discharged to the outside of the fluidized bed drying apparatus 102 as, for example, 150 ° C. condensed water B.

  That is, on the inner surface of the heat transfer member 103 that is a heating means, the superheated steam A condenses into a liquid (moisture), so the condensed latent heat dissipated at this time is effectively used for heating the drying of the lignite 101. . Any heating medium other than the high-temperature superheated steam A may be used as long as it is accompanied by a phase change. Examples thereof include Freon, pentane, and ammonia. In addition to using a heat medium as the heat transfer member 103, an electric heater may be installed.

Generating steam 104 generated when the brown coal 101 is dried by the heat transfer member 103 is fluidized in the fluidized bed dryer 102, by generating from the freeboard section F steam line L ₁ formed in the upper space of the fluidized bed 111 It is discharged outside the layer drying apparatus 102. Since the generated steam 104 includes a material obtained by drying and pulverizing the lignite 101, the steam 104 is collected by a dust collector 105 such as a cyclone or an electric dust collector and separated as a solid component 115.
This solid component 115 is mixed with the dry lignite 108 in the product line L ₄ extracted from the fluidized bed drying apparatus 102 via the separation line L ₃ , cooled by the cooler 110, and used as product charcoal 109. This product charcoal 109 is used as a raw material for boilers, gasifiers, and the like.

  On the other hand, since the generated steam 104 after being collected by the dust collector 105 is, for example, steam at 105 to 110 ° C., it is recovered by the heat recovery system 106, processed by the water treatment unit 112, and drained 113. As shown in FIG. Note that the generated steam 104 after being collected by the dust collector 105 may be applied to, for example, a heat exchanger, a steam turbine, or the like to effectively use the heat.

Part of the steam generated 104 after being dust collecting by a dust collector 105, is sent to the fluidized bed dryer 102 by the circulation fan 114 interposed in the branch line L _2, the fluidized bed of lignite 101 It is used as fluidized steam 107 that causes 111 to flow. As a fluidizing medium for fluidizing the fluidized bed 111, a part of the generated steam 104 is reused. However, the fluidizing medium is not limited to this. For example, nitrogen, carbon dioxide, or a low oxygen concentration containing these gases is used. Air may be used.

The fluidized bed drying apparatus 102 described above exemplifies a tube-shaped heat transfer member as the heat transfer member 103, but the present invention is not limited to this, for example, a plate-shaped heat transfer member May be used.
Moreover, although the structure which supplies superheated steam A to the heat-transfer member 103 and dries the lignite 101 indirectly was demonstrated, not only this but the lignite 101 is made into fluidized steam 107 which makes the fluidized bed 111 of the lignite 101 flow. It is good also as a structure dried directly by supplying the fluidizing gas for heating further, and drying.

  In addition, although the brown coal 101 was illustrated as to-be-dried material, as long as it has a high water content, it is good also considering to-be-dried materials, such as low grade coal containing subbituminous coal, sludge, etc., and sludge.

An example in which the product coal 109 dried by the fluidized bed drying apparatus 102 shown in FIG. 1 is applied to a lignite-fired boiler will be described. FIG. 2-1 is a schematic diagram illustrating an example of a lignite-fired boiler to which the fluidized bed drying facility 100 illustrated in FIG. 1 is applied.
In the lignite-fired boiler 150 according to the present embodiment, a furnace 151 installed in a vertical direction, a combustion device 152 installed in a lower part of a furnace wall of the furnace 151, a flue 153 connected to an outlet of the furnace 151, A plurality of superheaters 154 provided in the flue 153, a economizer 155, an induction fan 156 provided on the downstream side of the flue 153, and a chimney 157 are provided.

The combustion device 152 includes a plurality of pulverized coal burners 158 attached to the furnace wall, an impact pulverizer 159 that converts pulverized coal to be supplied to the pulverized coal burner 158, and secondary air as combustion air to the pulverized coal burner 158. And air supply means 160 for supplying (air).
The impact-type pulverizer 159 pulverizes the supplied lignite 101 into pulverized coal having a size suitable for combustion (for example, several μm to several hundred μm). A part of the combustion gas 161 is introduced and dried and pulverized. The impact type pulverizer 159 is supplied with product charcoal 109 previously dried by the fluidized bed drying equipment 100 described above.

  In the air supply means 160, a push ventilator (air supply device) 162 that pressurizes and supplies air, an air box 163 provided on the outer wall of the furnace 151, and air that connects the push ventilator 162 and the air box 163. A tube 164 is provided. A regenerative heat exchanger 165 is installed across the air pipe 164 and the flue 153 so as to exchange heat between the secondary air (air) and the combustion gas.

Steam generated in the lignite-fired boiler 150 is used in the turbine equipment 165. The turbine equipment 165 is provided with a plurality of turbines (for example, high-pressure / medium-pressure / low-pressure turbines). For example, the high-pressure turbine expands superheated steam introduced from the superheater 154 and converts it into rotational energy, and supplies exhaust steam to the primary reheater. In the intermediate pressure turbine, heated steam reheated by the primary reheater and the secondary reheater is introduced from the secondary reheater, and is expanded and converted into rotational energy. The low-pressure turbine introduces the exhaust steam of the intermediate-pressure turbine and further expands it to convert it into rotational energy.
The rotational energy converted by the high-pressure turbine, the intermediate-pressure turbine, and the low-pressure turbine is transmitted to the generator G connected by the shaft to generate electric power.
The exhaust steam that has finished work in the low-pressure turbine is sent to the condenser 166, where it is condensed and returned to water. The water condensed in the condenser 166 is sent to the economizer 155 through the water supply line 167. The water supply line 167 is provided with a condensate pump, a deaerator, a water supply pump water heater, etc. (not shown).

The operation of the lignite-fired boiler 150 described above will be described.
The lignite 101 supplied from a lignite bunker (not shown) is dried by the fluidized bed drying equipment 100 to remove moisture, and then dried and pulverized by a combustion gas 161 of about 1,000 ° C. by an impact pulverizer 150 to burn. It is pulverized into pulverized coal of a size suitable for. Thereafter, the pulverized coal that has been pulverized is mixed with pressurized carrier air to form a pulverized coal mixture, and is sent to the pulverized coal burner 158 through a coal supply pipe.

  On the other hand, the secondary air pressurized and supplied by the forced air blower 162 is supplied with heat from the combustion gas by the rotary regenerative heat exchanger 160, heated, and supplied to the wind box 163 through the air pipe 164. The The secondary air is sent from the wind box 163 to the pulverized coal burner 158. A pulverized coal mixture and secondary air are supplied from the pulverized coal burner 158 into the furnace 151, and when ignited, a flame is generated in the furnace.

When a flame is generated in the lower portion of the furnace 151 in this way, the combustion gas flows from the bottom to the top in the furnace 151 and is discharged to the flue 153. At this time, the water supplied from the water supply pump is preheated by the economizer 155 and then supplied to the water wall pipe. The water supplied to the water wall pipe is heated by the combustion gas while flowing through the water wall pipe from the bottom to the superheated steam, and is sent to the superheater 154. Furthermore, the superheated steam sent to the primary superheater is then sequentially introduced into the secondary superheater, the tertiary superheater, and the fourth superheater, and is superheated by the combustion gas 161. Superheated steam generated by the fourth superheater is supplied to the high-pressure turbine of the turbine equipment 165.
On the other hand, the exhaust steam expanded and worked in the high-pressure turbine is introduced into the primary reheater and then into the secondary reheater, where it is superheated again by the combustion gas. The superheated steam superheated by the secondary reheater is supplied to the intermediate pressure turbine. The steam that has expanded and worked in the medium pressure turbine is supplied to the low pressure turbine. Rotational energy generated by the expansion of steam in the high-pressure turbine, intermediate-pressure turbine, and low-pressure turbine is transmitted to the generator G connected by the shaft to generate electric power.

The exhaust steam that has finished its work in the low-pressure turbine is sent to the condenser 160 where it is condensed and returned to the water. The water condensed in the condenser 160 passes through the water supply line 167 and is sent to the economizer 155 by the water supply pump.
On the other hand, the combustion gas that has passed through the economizer 155 supplies heat to the secondary air that passes through the air pipe 164 in the rotary regenerative heat exchanger 160 and is subjected to purification treatment such as desulfurization, denitration, and dust removal. , Discharged from the chimney 157 into the atmosphere.

According to this lignite-fired boiler 150, even when lignite 101 having high moisture is burned, the lignite 101 is dried by the efficient fluidized bed drying device 102.
A conventional high-temperature (1,000 ° C.) combustion gas is not necessary for the heat source required for the impact type pulverizer 163, and a lower-temperature (200-300 ° C.) combustion gas is sufficient. By using a system that recovers latent heat from water vapor generated in the drying apparatus 102, energy efficiency can be improved, and stable and efficient power generation can be performed over a long period of time.

  An example applied to an integrated coal gasification combined cycle (IGCC) system using product coal 109 dried by the fluidized bed drying apparatus 102 shown in FIG. 1 will be described. FIG. 2-2 is a schematic diagram illustrating an example of a coal gasification combined power generation system to which the fluidized bed drying facility 100 illustrated in FIG. 1 is applied.

  As shown in FIG. 2-2, the coal gasification combined power generation system 200 is a coal in which product coal (dry lignite) 109 as fuel is processed into pulverized coal 201 a pulverized by a mill 210 and converted into gasification gas 202. A gasification furnace 203, a gas turbine (GT) 204 that is operated using the gasification gas 202 as a fuel, and a heat recovery steam generator (HRSG) 206 that introduces turbine exhaust gas 205 from the gas turbine 204. A steam turbine (ST) 208 that is operated by the steam 207 generated in the above, and a generator (G) 209 connected to the gas turbine 204 and / or the steam turbine 208.

The coal gasification combined power generation system 200 gasifies pulverized coal 201a pulverized by a mill 210 in a coal gasification furnace 203 to obtain a gasified gas 202 which is a generated gas. The gasified gas 202 is dust-removed and gas-purified by a cyclone 211 and a gas purifier 212, and then supplied to a combustor 213 of a gas turbine 204, which is a power generation means. Is generated. The gas turbine 204 is driven by the combustion gas 214. The gas turbine 204 is connected to a generator 209, and the generator 209 generates electric power when the gas turbine 204 is driven. Since the turbine exhaust gas 205 after driving the gas turbine 204 still has a temperature of about 500 to 600 ° C., it is sent to an exhaust heat recovery boiler (HRSG) 206, where thermal energy is recovered. In the exhaust heat recovery boiler (HRSG) 206, steam 207 is generated by the thermal energy of the turbine exhaust gas 205, and the steam turbine 208 is driven by the steam 207. The exhaust gas 215 from which heat energy has been recovered by the exhaust heat recovery boiler (HRSG) 206 is released into the atmosphere via the chimney 217 after the NOx and SOx components in the exhaust gas 215 are removed by the gas purification device 216. . In the figure, reference numeral 218 denotes a condenser, 219 denotes air, 220 denotes a compressor, and 221 denotes an air separation device (ASU) that separates air into nitrogen (N ₂ ) and oxygen (O ₂ ). .

  According to this coal gasification combined cycle power generation system 200, even when gasifying using lignite 101 having a high moisture content, since the lignite 101 is dried by the efficient fluidized bed drying apparatus 102, the gasification efficiency is high. The power generation can be improved stably over a long period of time.

Moreover, in the coal gasification combined cycle power generation system 200, the efficiency of the coal-fired power plant, which has been about 40% in the past, can be improved to about 46% by combining the gas turbine and the steam turbine. By improving the plant efficiency, CO ₂ emissions can be reduced by about 13% compared to conventional coal fired boilers.

[First Embodiment]
The fluidized bed drying apparatus according to the first aspect of the present invention will be described below with reference to FIG.
As shown in FIG. 3, the fluidized bed drying apparatus 102 </ b> A of this embodiment is a fluidized bed drying apparatus that dries a granular material such as lignite 101 having high moisture, adhesion, and high condensability. An inclined portion 130 having an inclination angle (θ) of 90 ° or less, more preferably about 60 to 80 °, is formed on the bottom side wall surface on the supply port side of the inlet portion 102a of the apparatus 102A. Yes.
The lignite 101 is supplied from the upper part of the inclined part 130 or along the inclined part 103.

  Further, the inclined portion 130 to which the lignite 101 is supplied is not supplied with the fluidized steam 107 which is a fluidized gas, and is provided on the bottom side after the lignite 101 flows down along the inclined portion 130 to the bottom side. From the dispersion plate 116, fluidized vapors 107a and 107b, which are fluidized gases, are supplied and fluidized.

  Further, as the supply amount of the fluidized steam 107, the gas supply amount of the fluidized steam 107a in the introduction / fluidized bed zone X in the vicinity of the inclined portion 130 where the lignite 101 flows down, and the fluidized steam in the other dry fluidized bed zone Y are used. The fluidization of the lignite 101 in the introduction / fluidized bed zone X may be promoted by increasing the amount of gas compared to the amount of gas 107b.

  As a result, in the introduction / fluidized bed zone X of the inlet portion 102a of the fluidized bed drying apparatus 102A, the supplied lignite 101 is mixed with the surrounding granular material, and the fluidized bed along the inclined portion 130. It moves to the bottom side of 111, fluidizes, mixing with the granular material which the surrounding drying advanced again by the upward flow from the fluidization vapor | steam 107a supplied from the dispersion plate 116 of the bottom side, and starts drying. It becomes.

  As described above, according to the present invention, by providing the inclined portion 130, the high quality of the lignite 101, which is the high-moisture supplied to the fluidized bed drying apparatus 102 </ b> A and has high adhesion and condensability. Mixing can be promoted and fluidization can be promoted. Therefore, even when lignite 101 with high adhesion is supplied, poor flow due to adhesion and aggregation can be prevented.

In this embodiment, the inlet portion 102a for supplying the lignite 101 is formed on the side wall 102b. However, the present invention is not limited to this, and the inlet portion is formed on the top portion 102c side. Also good.
Moreover, in this embodiment, although the heat-transfer member as shown in FIG. 1 is abbreviate | omitted, it cannot be overemphasized that it is applicable also to the fluidization drying apparatus which dries directly, without providing a heat-transfer member.

[Second Embodiment]
A fluidized bed drying apparatus according to a second aspect of the present invention will be described with reference to FIG.
As shown in FIG. 4, the fluidized bed drying apparatus 102B of the 2nd aspect of a present Example is demonstrated with reference to FIG. As shown in FIG. 4, a supply nozzle 132 that ejects a stirring gas 131 laterally into the fluidized bed 111 is provided in the inclined portion 130 on the inlet portion 102 a side of the fluidized bed drying apparatus 102 </ b> B.
The supply nozzle 132 is preferably installed at a location near the bottom of the fluidized bed 111 because fluidization is promoted.

  Further, the installation direction of the supply nozzle 132 is preferably set to be horizontal or slightly downward from the horizontal in order to stir the fluidized steam 107 from the bottom side and promote fluidization.

  And in the inlet part 102a of the fluidized bed drying apparatus 102B, when the supplied lignite 101 moves to the bottom part of a fluidized bed along an inclination, mixing with the surrounding granular material which dried, it is for stirring Stirring in the lateral direction is promoted by the gas 131 and further fluidized while being mixed with the dry lignite that has been dried around, thereby promoting drying.

[Third Embodiment]
A fluidized bed drying apparatus according to a third aspect of the present invention will be described with reference to FIG.
As shown in FIG. 5, a fluidized bed drying apparatus 102 </ b> C according to a third aspect of the present embodiment will be described with reference to FIG. 5. As shown in FIG. 5, in the fluidized bed drying apparatus 102 </ b> C, partition walls 133 having gaps 132 a and 132 b are provided in the fluidized bed 111 so as to introduce the material to be dried / fluidized bed zone X and the dried fluidized bed on the downstream side. The area Y is separated. In this embodiment, the gap portion is provided above and below, but in order to make it easier to move the dry coal on the downstream side to the introduction portion of the material to be dried and mix it, at least a gap is formed at the lower portion of the partition wall. It is desirable to provide.

The amount of fluidized steam 107a in the introduction / fluidized bed zone X is made larger than the amount of fluidized steam 107b in the dry fluidized bed zone Y on the downstream side.
As a result, at the inlet portion 102a of the fluidized bed drying apparatus 102C, the supplied lignite 101 moves to the bottom side of the fluidized bed 111 along the inclined portion 130 while being mixed with the surrounding granular powder that has been dried. Then, after being reliably mixed with the dry lignite that has already been dried, it passes through the upper and lower gaps 132a, 132b of the partition wall 133 and moves to the dry fluidized bed region Y side on the downstream side, and fluidization for drying is performed. I try to do it enough. Thereby, drying of lignite progresses favorably and the further improvement of drying efficiency can be aimed at.

  As described above, the fluidized bed drying apparatus and equipment according to the present invention are suitable for implementing measures that can achieve good mixing in the fluidized bed drying apparatus and promote fluidization.

DESCRIPTION OF SYMBOLS 100 Fluidized bed drying equipment 101 Brown coal 102, 102A-102C Fluidized bed drying device 103 Heat transfer member 104 Generated steam 105 Dust collector 106 Heat recovery system 107, 107a, 107b Fluidized steam 108 Dry brown coal 109 Product coal 110 Cooler 111 Flow Layer 112 Water treatment unit 113 Drainage 114 Circulation fan 115 Solid component 116 Dispersion plate 130 Inclination part 131 Stirring gas 132 Supply nozzle 133 Partition 150 Brown coal fired boiler 151 Furnace 152 Combustion device 153 Flue 154 Superheater 159 Impact type crusher 165 Turbine Equipment 200 Coal gasification combined cycle system 201 Coal 201a Pulverized coal 202 Gasification gas 203 Coal gasification furnace 204 Gas turbine (GT)
205 Turbine exhaust gas 206 Waste heat recovery boiler (HRSG)
207 Steam 208 Steam turbine (ST)
209 Generator (G)
210 Mil 211 Cyclone 212 Gas purification device 213 Combustor 214 Combustion gas 215 Exhaust gas 217 Chimney 218 Condenser 219 Air 220 Compressor 221 Air separation device (ASU)
A Superheated steam B Condensate F Free board

Claims (4)

In the fluidized bed drying apparatus for flowing and drying the lignite supplied to the drying chamber by supplying fluidizing gas to the drying chamber,
An inlet for charging lignite formed on the side wall of the drying chamber;
An inclined portion formed on the bottom side surface of the side wall;
In the drying chamber, provided with a partition wall having a gap formed by separating the introduction / fluidized bed region of lignite and the dried fluidized bed region on the downstream side,
With supply lignite from the upper side of the inclined portion, the fluidizing gas is supplied from the bottom side in the area other than the inclined portion, to form the introduction and fluidized bed of brown coal,
A fluidized bed drying apparatus characterized in that the amount of fluidized gas in the introduction / fluidized bed region is made larger than the amount of gas in the dry fluidized bed region on the downstream side other than the introduction / fluidized bed region . In claim 1,
The fluidized bed drying apparatus according to claim 1, wherein an inclination angle of the inclined portion is not less than an angle of repose of the particles to be dried and not more than 90 °. In claim 1 or 2,
A fluidized bed drying apparatus comprising a supply nozzle for supplying a stirring gas to the inclined portion. The fluidized bed drying apparatus according to any one of claims 1 to 3 , which dries an object to be dried having a high water content;
A heat transfer member that is provided in the fluidized bed drying apparatus, supplies superheated steam to the inside of the tubular or plate shape, and removes moisture in the material to be dried;
A generated steam line for discharging generated steam generated when the material to be dried is dried by the heat transfer member to the outside of the fluidized bed drying device;
A dust collector interposed in the generated steam line to remove dust in the generated steam;
A heat recovery system that is interposed downstream of the dust collector in the generated steam line and recovers the heat of the generated steam;
A branch line for branching a part of the generated steam from which dust is removed from the dust collector, and supplying the fluidized steam into the fluidized bed drying device;
A fluidized-bed drying facility comprising: a cooler that cools an object to be dried extracted from the fluidized-bed drying device.

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