WO2013145725A1

WO2013145725A1 - Apparatus for supplying fluid particles to fluidized-bed gasification furnace

Info

Publication number: WO2013145725A1
Application number: PCT/JP2013/002060
Authority: WO
Inventors: 博之細田; 卓也河合; 諒早川
Original assignee: 株式会社神鋼環境ソリューション
Priority date: 2012-03-30
Filing date: 2013-03-26
Publication date: 2013-10-03
Also published as: JP5778069B2; JP2013210165A

Abstract

In the present invention, an apparatus for supplying fluid particles is provided with a conveyor casing, a screw shaft, and a fluid particle reservoir. The conveyor casing is provided with a cylindrical peripheral wall extending from an opening to a particle-charging part. The screw shaft is capable of transporting, inside the conveyor casing, fluid particles supplied via an opening by the rotation of the screw shaft. The fluid particle reservoir is arranged above the opening and supplies internally packed fluid particles into the conveyor casing through the opening so as to accumulate the packed fluid particles on the fluid particles inside the conveyor casing. The conveyor casing is slanted so as to be higher toward the particle-charging part than toward the opening.

Description

Fluidized particle feeder for fluidized bed gasifier

The present invention relates to a fluidized particle supply apparatus for supplying the fluidized particles into a fluidized bed gasification furnace that takes out combustible gas from the wastes by heating the wastes in a fluidized bed in which fluidized particles are fluidized. Is.

Conventionally, a gasification system disclosed in Patent Document 1 is known. In this gasification system, as shown in FIG. 3, the fluidized particles discharged together with incombustibles from the fluidized bed gasifier 100 are returned to the fluidized bed gasifier 100. Thereby, the fluidized particles are circulated and used. Specifically, it is as follows.

The fluidized bed gasification furnace 100 has fluidized particles (eg, cinnabar sand) inside the furnace, and heats the waste in the fluidized bed 102 in which the fluidized particles are fluidized. Thereby, the fluidized bed gasification furnace 100 takes out combustible gas (pyrolysis gas) from waste. In the fluidized bed gasifier 100, the waste, incombustibles and the like after the combustible gas is taken out are discharged out of the fluidized bed gasifier 100 together with the fluidized particles. The fluidized particles discharged out of the furnace together with the incombustible material and the like are separated from the incombustible material and the like by the separation device 104. Thereafter, the fluidized particles are returned to the fluidized bed gasification furnace 100 by the fluidized particle circulation elevator 106 or the like, and constitute the fluidized bed 102 again.

Combustible gas is generated in the fluidized bed gasifier 100. For this reason, unnecessary external air (air other than air that is actively supplied into the fluidized bed gasifier 100 for combustion control) is prevented from flowing into the fluidized bed gasifier 100. There is a need. The fluidized bed gasification furnace 100 has a fluidized particle injection valve 108 at a site where the fluidized particles discharged together with incombustibles and the like are returned (input) into the fluidized bed gasification furnace 100 again. Is provided. The fluidized bed gasification furnace 100 prevents the unnecessary air from flowing into the fluidized bed gasification furnace 100 by closing the fluidized particle input valve 108.

However, in the fluidized bed gasification furnace 100, when the discharged fluidized particles are returned to the fluidized bed gasification furnace 100, the fluidized particles are charged with the fluidized particle charging valve 108 open. In some cases, air from the outside flows into the fluidized bed gasification furnace 100 from the fluidized particle injection valve 108 in an open state together with fluidized particles. In addition, it is conceivable to use a double damper in order to prevent air from flowing in in an open state, but it is difficult to ensure sufficient sealing performance.

JP 2004-263886 A

An object of the present invention is to provide a fluidized bed gasifier capable of preventing external air from flowing into the furnace from the fluidized particle injection site when the fluidized particles are charged into the fluidized bed gasifier. It is to provide a fluidized particle supply device.

According to one aspect of the present invention, there is provided a fluidized particle supply device for supplying fluidized particles into a fluidized bed gasification furnace from a particle input unit provided in the fluidized bed gasification furnace, wherein the fluidized particles are A conveyor casing having an opening for receiving and having a cylindrical peripheral wall extending to the particle input portion at a position horizontally separated from the opening; and rotatably accommodated in the conveyor casing; A screw shaft capable of transporting the fluidized particles supplied from the opening into the conveyor casing through the rotation to the particle charging unit, and disposed above the opening, and can be filled with the fluidized particles therein. A fluidized particle reservoir that feeds the filled fluidized particles from the opening into the conveyor casing so as to be stacked on the fluidized particles in the conveyor casing; Equipped with a. And the said conveyor casing inclines so that the said particle insertion part side may become an upper position rather than the said opening part side.

FIG. 1 is a block diagram of a gasification system according to the present embodiment. FIG. 2 is a schematic configuration diagram of the fluidized particle supply device according to the present embodiment. FIG. 3 is a block diagram of a conventional gasification and melting system.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

The fluidized particle supply apparatus of the present embodiment supplies fluidized particles to, for example, a fluidized bed gasification furnace used in a gasification system that extracts combustible gas from waste. In the following, first, the gasification system 10 will be described with reference to FIG. Thereafter, the fluidized particle supply apparatus will be described.

The gasification system 10 includes a fluidized bed type gasification furnace 11, a fluidized particle circulation unit 20, and a gas processing unit 30.

A fluidized bed gasification furnace (hereinafter, also simply referred to as “gasification furnace”) 11 heats waste by a fluidized bed 18 in which fluidized particles are fluidized, and combustible gas (pyrolysis gas) from the waste. ). The gasification furnace 11 includes a furnace main body 12 having fluidized particles therein, a waste supply unit 13 for introducing waste into the furnace main body 12, fluidized particles in the furnace main body 12, and waste And an air supply unit 14 for supplying air for burning an object. A discharge part 15 for discharging a mixture such as waste after the flowing particles, incombustibles, and combustible gas are taken out is provided in the lower part of the furnace body 12. An exhaust part 16 for discharging the combustible gas generated from the waste is provided at the upper part of the furnace body 12. In addition, a particle introduction portion 17 for introducing fluidized particles from above the fluidized bed 18 is provided at an intermediate portion in the height direction of the furnace body 12.

The fluidized particles are particles for forming the fluidized bed 18 inside the furnace body 12 and heating the waste. That is, the fluidized particles are heated by the combustion of a part of the waste and become high temperature, and the fluidized particles at the high temperature are mixed with the waste, thereby gasifying the waste and generating combustible gas. . The fluidized particles of this embodiment are, for example, silica sand. More specifically, the fluidized particles are, for example, cinnabar No. 4 or cinnabar No. 5. Here, the cinnabar No. 4 is, for example, a particle having a particle size distribution and mainly containing particles having a particle diameter of 0.425 mm to 1.2 mm (mainly composed of silica). Specifically, for example, the particle size of 0.425 mm to 0.60 mm is 8.0%, the particle size of 0.60 mm to 0.85 mm is 71.7%, and the particle size is 0.85 mm. Those with ˜1.00 mm are 15.1% and those with 1.00 mm to 1.2 mm are 4.7%. The cinnabar No. 5 is, for example, a particle (contaminated sand) mainly composed of silica having a particle size distribution mainly including a particle size of 0.30 mm to 0.8 mm. Specifically, for example, the particle size of 0.30 mm to 0.425 mm is 18.6%, the particle size of 0.425 mm to 0.60 mm is 54.2%, and the particle size is 0.60 mm. It is 19.7% for ˜0.80 mm.

The fluidized particle circulation unit 20 includes an incombustible material discharge device 21, a fluidized particle circulation elevator 22, a fluidized particle storage tank 23, and a fluidized particle supply device 40. The fluidized particle circulation unit 20 returns the fluidized particles discharged from the furnace body 12 to the furnace body 12 again.

The incombustible discharge device 21 separates fluid particles and noncombustibles from the mixture discharged from the discharge section 15 of the furnace body 12. The fluid particle conveyor 24 conveys the fluid particles separated from the mixture by the incombustible discharge device 21 to the fluid particle circulation elevator 22. The incombustible material conveyor 25 conveys the incombustible material or the like separated from the mixture by the incombustible material discharge device 21 to the incombustible material yard 26.

The fluidized particle circulation elevator 22 transports the fluidized particles separated by the incombustible discharge device 21 to a position above the particle charging unit 17 of the furnace body 12. The fluid particle circulating elevator 22 switches the first damper 22a and the second damper 22b so that the fluid particles conveyed to the upper position are fluidized particle supply device 40, fluid particle storage tank 23, or incombustible material yard 26. To supply. Specifically, the fluid particle circulating elevator 22 normally supplies fluid particles to the fluid particle supply device 40. Then, when the fluidized particles stored in the fluidized particle storage unit in the fluidized particle supply device 40 reach a predetermined amount, the fluidized particle circulating elevator 22 is stopped or the conveying speed of the fluidized particle conveyor 24 is decreased. Thus, the balance of the amount of fluid particles at the storage site is maintained.

If the fluidized particles continue to be used in the gasification furnace 11, the fluidized particles having a larger particle size due to the adhesion of incombustibles and ash increase, thereby deteriorating the fluidized state of the fluidized bed 18. For this reason, the fluidized particles having a particle size larger than a predetermined value are sieved in the incombustible discharge device 21 and supplied to the incombustible yard 26.

The fluidized particle storage tank 23 stores a predetermined amount of fluidized particles. And at the time of starting of the furnace main body 12, when the quantity of the fluid particle | grains circulated between the furnace main body 12 and the fluid particle | grain circulation part 20 reduces significantly, or the quantity of the fluid particle | grains in the furnace body 12 is increased. Sometimes, the fluidized particle reservoir 23 supplies fluidized particles to the fluidized particle circulation elevator 22.

The gas processing unit 30 includes a gas reforming furnace 31, a gas cooler 32, a bag filter 33, and an induction fan 34. The gas processing unit 30 performs a reforming process on the pyrolysis gas (a gas containing a combustible gas) discharged from the gasification furnace 11.

The gas reforming furnace 31 reforms (cracks) the pyrolysis gas discharged from the gasification furnace 11 to decompose tar and the like contained in the pyrolysis gas. Thereby, the gas reforming furnace 31 is made into a property (combustible gas) that allows the pyrolysis gas to be reused as fuel gas or raw material gas. The gas cooler 32 cools the combustible gas reformed in the gas reforming furnace 31. The bag filter 33 removes dust, dust and the like from the combustible gas after cooling. The induction fan 34 attracts the pyrolysis gas generated in the gasification furnace 11 to the gas processing unit 30. When the pyrolysis gas is attracted from the gasification furnace 11 (furnace main body 12) by the induction fan 34, the pressure in the gasification furnace 11 becomes atmospheric pressure or less.

The combustible gas reformed in the above gas processing unit 30 is supplied as fuel to a gas turbine, a gas engine, a gas boiler, or the like at the subsequent stage.

Next, the fluidized particle supply device 40 will be described with reference to FIG.

The fluidized particle supply device 40 includes a fluidized particle storage unit 42, a fluidized particle transport unit 44, and a control unit 46.

The fluid particle storage unit 42 stores the fluid particles supplied from the fluid particle circulation elevator 22 and supplies the stored fluid particles to the fluid particle transport unit 44. The fluidized particle reservoir 42 is provided on the reservoir main body 421, the connection part 422 connecting the reservoir main body 421 and the fluidized particle transport unit 44, and the upper part of the reservoir main body 421, and flows into the reservoir main body 421. A charging unit 423 capable of charging particles and a plurality (four in this embodiment) of

level meters

424a, 424b, 424c, 424d attached to the storage unit main body 421 are provided.

The storage unit main body 421 has a hollow column shape extending vertically, and stores fluid particles inside the storage unit main body 421.

The connection part 422 connects the lower end part of the storage part main body 421 and the screw conveyor 441. Thereby, the inside of the storage unit main body 421 communicates with the inside of the screw conveyor 441 in the fluid particle transport unit 44.

Each

level meter

424a, 424b, 424c, 424d is in contact with the upper end position (the height position of the boundary surface between the stored flow particle and the space above it) of the flow particle stored in the storage unit main body 421. Detect without contact. As

such level meters

424a, 424b, 424c, and 424d, for example, a capacitance type level meter, a paddle type level meter, a laser type level meter, or the like is used.

Each

level meter

424a, 424b, 424c, 424d outputs a detection signal when it detects the upper end position. In the present embodiment, four level meters (a first level meter 424a, a second level meter 424b, a third level meter 424c, and a fourth level meter 424d) are attached to the storage unit main body 421. Specifically, the four

level meters

424a, 424b, 424c, 424d are arranged in a line at intervals in the vertical direction.

In addition, although only one

level meter

424a, 424b, 424c, 424d of this embodiment is provided in the horizontal plane direction (same height position), it is not limited to this arrangement. That is, a plurality of level meters may be provided in the horizontal plane direction (same height position). Thereby, the misdetection of the level meter due to the deviation of the flowing particles in the reservoir main body 421 can be prevented. In particular, it is preferable that a plurality of level meters are provided at the same height position (in this embodiment, for example, the height positions of the

level meters

424a and 424b) in the lower stage (lower part of the storage unit main body 421). According to such a configuration, erroneous detection of the level meter is effectively prevented.

The fluid particle transport unit 44 includes a screw conveyor 441 and a drive unit 442 that drives the screw conveyor 441.

The screw conveyor 441 includes a conveyor casing 443, a screw shaft 444 accommodated inside the conveyor casing 443, and a plurality of support portions 448.

The conveyor casing 443 includes a casing main body 445, an inspection port portion 446, and a fluid particle discharge portion 447.

The casing body 445 has a cylindrical peripheral wall. Both ends of the peripheral wall are closed. The connection part 422 of the fluidized particle storage part 42 is connected to an opening 445 a provided at the upper end part of one end part (the left end part in FIG. 2) of the casing body 445. As a result, the inside of the storage unit main body 421 and the inside of the casing main body 445 communicate with each other through the connection unit 422.

The inspection opening 446 is an opening provided at the upper end of the other end of the casing body 445 (the end opposite to the one end: the right end in FIG. 2). A lid 446 a is attached to the inspection port portion 446. When the lid 446a is removed, the inside of the casing body 445 can be inspected from the inspection port portion 446.

The fluidized particle discharge unit 447 discharges the fluidized particles in the casing body 445 into the particle input unit 17 of the furnace body 12. Specifically, the fluidized particle discharger 447 connects the lower end of the other end of the casing body 445 and the particle charging part 17 of the furnace body 12. Thereby, the inside of the casing body 445 communicates with the inside of the furnace body 12. The fluid particle discharge unit 447 is connected to the particle input unit 17 in an airtight state. Thereby, the inside of the fluid particle storage part 42 communicates with the inside of the casing main body 445 and the inside of the fluid particle discharge part 447 in an airtight state through the inside of the fluid particle discharge part 447.

The plurality of support portions 448 have the casing main body 445 arranged so that the end on the fluid particle discharge portion 447 side (particle input portion 17 side) is positioned above the end on the connection portion 422 side of the fluid particle storage portion 42. Support in an inclined position. Specifically, the plurality of support portions 448 support the casing body 445 such that the central axis of the casing body 445 is, for example, 15 ° with respect to the horizontal. The angle of the central axis of the casing body 445 with respect to the horizontal is preferably 10 ° to 45 °. When the angle of the central axis is 10 ° to 45 °, there is no significant difference in the material sealing effect due to the compaction of the flowing particles in the casing body 445. On the other hand, when the angle of the central axis is less than 10 °, the material sealing effect due to the compaction of the fluidized particles in the casing body 445 is reduced, and air flows in the casing body 445.

The screw shaft 444 includes a shaft main body 444a extending in the same direction as the casing main body 445, and screw (spiral) blades 444b provided on the peripheral surface of the shaft main body 444a. The screw shaft 444 is housed inside the casing body 445 so as to be rotatable around the central axis of the shaft body 444a.

The driving unit 442 is connected to a screw shaft 444 (shaft body 444a) housed in the casing body 445. The drive unit 442 rotates the screw shaft 444 based on the instruction signal from the control unit 46. When the drive unit 442 rotates the screw shaft 444, the fluidized particles are conveyed inside the casing body 445 from the end on the fluidized particle storage unit 42 side toward the end on the fluidized particle discharge unit 447 side.

The control unit 46 is connected to each

level meter

424a, 424b, 424c, 424d and the drive unit 442. The control unit 46 outputs an instruction signal to the drive unit 442, the fluidized particle circulating elevator 22, the waste supply unit 13, and the like based on the detection signals from the

level meters

424a, 424b, 424c, 424d. Specifically, it is as follows.

An amount of fluidized particles is stored in the fluidized particle storage unit 42 at the start of operation of the fluidized bed gasifier 11 so that the upper end position of the fluidized particles is between the second level meter 424b and the third level meter 424c. Has been. And the control part 46 drives the fluid particle supply apparatus 40 and the elevator 22 for fluid particle circulation.

When the supply amount of the fluid particles from the fluid particle supply device 40 to the furnace body 12 is larger than the fluid particle supply amount from the fluid particle circulation elevator 22 to the reservoir body 421, the upper end of the fluid particles in the reservoir body 421 The position gradually decreases. When the upper end position reaches the position of the second level meter 424b, the control unit 46 receives a detection signal from the second level meter 424b. Then, the control unit 46 outputs an instruction signal for stopping the driving unit 442 (that is, stopping the fluidized particle supply device 40) toward the driving unit 442. Thereby, the fall of the upper end position of the fluidized particle in the storage part main body 421 stops, and the material seal effect by the fluidized particle from the fluidized particle storage part 42 to the casing main body 445 is maintained.

Temporarily, the difference between the supply amount of the fluid particles from the fluid particle supply device 40 to the furnace body 12 and the supply amount of the fluid particles from the fluid particle circulation elevator 22 to the reservoir main body 421 is very large. When the upper end position of the flowing particles in the main body 421 is lowered to the first level meter 424a, the control unit 46 receives the detection signal from the first level meter 424a, and then receives an instruction signal for stopping the waste supply unit 13. Output to the waste supply unit 13 to stop the supply of waste into the furnace body 12. Thereby, the production amount of the combustible gas in the furnace body 12 is reduced. For this reason, even if external air flows into the furnace body 12 through the fluidized particle supply device 40 because the amount of fluidized particles in the reservoir main body 421 is reduced and the material sealing effect by the fluidized particles is reduced, the furnace The reaction between the combustible gas and the air in the main body 12 is suppressed.

When the upper end position of the flowing particles is lower than the second level meter 424b, the flowing particle supply device 40 is stopped. For this reason, when the fluid particle circulation elevator 22 supplies the fluid particles to the reservoir main body 421, the upper end position of the fluid particles in the reservoir main body 421 gradually rises. When the upper end position rises to the third level meter 424c, the control unit 46 receives a detection signal from the third level meter 424c. Then, the control unit 46 outputs an instruction signal for driving the drive unit 442 (that is, operating the fluidized particle supply device 40) to the drive unit 442.

When the supply amount of the fluid particles from the fluid particle supply device 40 to the furnace body 12 is smaller than the fluid particle supply amount from the fluid particle circulation elevator 22 to the reservoir body 421, the upper end of the fluid particles in the reservoir body 421 The position gradually rises. When the upper end position rises to the fourth level meter 424d, the control unit 46 outputs an instruction signal for stopping the fluidized particle circulating elevator 22 to the fluidized particle circulating elevator 22. As a result, the supply of fluid particles from the fluid particle circulation elevator 22 to the reservoir main body 421 is stopped. On the other hand, since the drive unit 442 continues to drive, the supply of fluidized particles into the furnace body 12 is maintained, and thereby the upper end position of the fluidized particles in the reservoir body 421 gradually decreases. When the upper end position is lowered to the third level meter 424c, the control unit 46 receives the detection signal from the third level meter 424c and sends an instruction signal for driving the fluid particle circulation elevator 22 to the fluid particle circulation elevator. Output to 22

The control unit 46 may switch the first damper 22a in place of the on / off of the fluid particle circulating elevator 22. In this case, since the fluidized particle circulation elevator 22 continues to operate, the amount of fluidized particles supplied to the storage unit main body 421 can be controlled without stopping the extraction of the incombustible material from the furnace main body 12.

According to the above fluidized particle supply apparatus 40, fluidized particles in the reservoir main body 421 and the casing main body 445 function as a material seal. Thereby, it is possible to prevent external air from flowing into the furnace main body 12 from the particle input unit 17 through the fluidized particle supply device 40 when the flowing particles are introduced into the furnace main body 12. Specifically, when the fluid particles are filled into the reservoir main body 421, the reservoir main body 421 supplies the filled fluid particles so as to be stacked on the fluid particles in the casing body 445 through the opening 445a. . As a result, at least the inside of the casing body 445 around the opening 445a is filled with the fluidized particles, and is densely packed by the weight of the fluidized particles in the reservoir body 421 stacked on the upper side. In addition, the flowing particles are also densely packed by the weight of the upper flowing particles at the bottom of the reservoir main body 421. As a result, the fluidized particles act as a material seal, and the flow of air from the fluidized particle reservoir 42 to the particle inlet 17 through the casing body 445 is prevented. In addition, even when the screw shaft 444 rotates and the fluidized particles are transported toward the particle charging unit 17 through the casing body 445, the force directed toward the opening 445a acts on the fluidized particles due to the inclination of the casing body 445. . For this reason, the dense state of the fluidized particles at least around the opening 445a of the casing main body 445 is maintained, thereby maintaining the function of the fluidized particles as a material seal. Accordingly, it is possible to prevent external air from flowing from the particle input unit 17 into the furnace body 12 through the fluidized particle supply device 40 while supplying the flowing particles from the particle input unit 17 into the furnace main body 12.

Further, in the fluidized particle supply device 40 of the present embodiment, when the second level meter 424b detects that the fluidized particles stored in the storage unit main body 421 has decreased, the control unit 46 controls the screw conveyor 441 (drive unit 442). Stop. Thereby, before the flowing particles in the storage unit main body 421 and the casing main body 445 decrease and the flowing particles do not function as a material seal, the supply of the flowing particles into the furnace main body 12 can be automatically stopped. it can.

In addition, the fluid particle supply apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

In the above embodiment, a plurality of level meters (first to

fourth level meters

424a, 424b, 424c, 424d) are provided in the fluidized particle reservoir 42, but only one may be used. In this case, if the first level meter 424a is provided, before the fluidized particles function as a material seal due to the decrease of the fluidized particles in the reservoir main body 421 and the casing main body 445, The supply of fluidized particles can be automatically stopped.

Further, the upper end position of the fluidized particles stored in the fluidized particle reservoir 42 is measured from the upper surface in the fluidized particle reservoir 42 by one level meter, and the drive unit 442 or the fluidized particle circulation elevator is measured based on the measurement result. The upper end position may be kept constant by controlling the conveyance speed of 22.

[Outline of the embodiment]
The above embodiment is summarized as follows.

That is, in the fluidized particle supply apparatus to the fluidized bed gasification furnace according to the above embodiment, the fluidized particles are supplied into the fluidized bed gasification furnace from the particle input unit provided in the fluidized bed gasification furnace. A fluidized particle supply device, comprising an opening for receiving the fluidized particles, and a conveyor casing provided with a cylindrical peripheral wall extending from the opening to the particle charging portion at a position separated in the horizontal direction; A screw shaft that is rotatably accommodated inside the conveyor casing, and is capable of conveying the flowing particles supplied into the conveyor casing from the opening by the rotation to the particle charging unit, and is disposed above the opening. The conveyor casing is configured so that the fluidized particles can be filled therein and the filled fluidized particles are stacked on the fluidized particles in the conveyor casing. And a flow particle storage unit for supplying from said openings. And the said conveyor casing inclines so that the said particle insertion part side may become an upper position rather than the said opening part side.

According to such a configuration, the fluid particles in the fluid particle reservoir and the conveyor casing function as a material seal. Thereby, when the fluidized particles are charged into the fluidized bed gasifier, it is possible to prevent external air from flowing into the fluidized bed gasifier through the fluidized particle supply device. Specifically, it is as follows.

When the fluidized particles are filled in the fluidized particle reservoir, the fluidized particle reservoir supplies the filled fluidized particles so as to be stacked on the fluidized particles in the conveyor casing through the opening. Thereby, at least the inside of the conveyor casing around the opening is filled with the fluidized particles. Further, the fluid particles around the opening are in a dense state due to the weight of the fluid particles in the fluid particle reservoir stacked on the upper side. Furthermore, the fluid particles at the bottom of the fluid particle reservoir are also densely packed by the weight of the fluid particles on the upper side. As a result, the fluidized particles act as a material seal, preventing the flow of air from the fluidized particle reservoir to the particle inlet through the conveyor casing. Moreover, even when the fluid particles are transported through the conveyor shaft toward the particle input portion by the rotation of the screw shaft, the force directed toward the opening acts on the fluid particles due to the inclination of the conveyor casing. For this reason, the dense state of the fluid particles at least around the opening of the conveyor casing is maintained, and the function of the fluid particles as a material seal is maintained. As a result, while supplying fluidized particles into the fluidized bed gasification furnace from the particle charging unit, it is possible to prevent external air from flowing into the fluidized bed gasification furnace through the fluidized particle supply device. Can do.

The fluidized particle supply device includes a drive unit that rotationally drives the screw shaft, and a control unit that controls the drive unit. And the said fluid particle storage part has a level meter which can detect the upper end position of the fluid particle stored inside the said fluid particle storage part, The said control part is the said fluid particle detected by the said level meter When the upper end position of the head becomes lower than a predetermined height position, the driving unit is stopped.

According to such a configuration, the level meter detects that the number of fluid particles stored in the fluid particle reservoir has decreased (the upper end position of the fluid particles has become lower than the predetermined height position), and the control unit can Stop the conveyor. As a result, the supply of fluidized particles into the fluidized bed gasifier can be automatically stopped before the fluidized particles no longer function as a material seal due to the decrease in fluidized particles in the fluidized particle storage unit and the conveyor casing. it can.

The present invention provides a fluidized particle supply device for a fluidized bed gasifier.

Claims

A fluidized particle supply device for supplying fluidized particles into a fluidized bed gasification furnace from a particle input unit provided in the fluidized bed gasification furnace,
A conveyor casing having an opening for receiving the fluidized particles and having a cylindrical peripheral wall extending from the opening to the particle input portion at a position away from the opening in the horizontal direction;
A screw shaft that is rotatably accommodated in the conveyor casing, and is capable of conveying the fluidized particles supplied from the opening to the conveyor casing by the rotation;
Located above the opening, the fluidized particles can be filled therein, and the filled fluidized particles are supplied from the opening into the conveyor casing so as to be stacked on the fluidized particles in the conveyor casing. A fluidized particle storage unit that
The said conveyor casing is a fluid particle supply apparatus which inclines so that the said particle input part side may become an upper position rather than the said opening part side.
The fluidized particle supply device according to claim 1,
A drive unit for rotationally driving the screw shaft;
A control unit for controlling the drive unit,
The fluidized particle reservoir has a level meter capable of detecting the upper end position of fluidized particles stored inside the fluidized particle reservoir.
The said control part is a fluid particle supply apparatus which stops the said drive part, if the upper end position of the said fluid particle detected by the said level meter becomes lower than predetermined | prescribed height position.