JP5379548B2 - Raw material input device for gasification equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a raw material charging device of gasification equipment by which a raw material is stably charged into a gasification furnace and the back flow of a gasified gas from the gasification furnace to an extracting device side and a raw material storage device side is certainly inhibited. <P>SOLUTION: This raw material charging device includes: a pushing-in ejector 20, which conveys the raw material so as to push the raw material to the gasification furnace 6 side by steam or an inert gas, in the middle of a raw material supply pipe 3 which connects a cutting-out device 2 and the gasification furnace 6; and a suction ejector 30, which sucks the gasified gas according to the ejector effect by the steam or the inert gas to return to the gasification furnace 6 when the gasified gas flows backward from the gasification furnace 6, on an input side of the pushing-in ejector 20. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a raw material charging apparatus for gasification equipment.

  2. Description of the Related Art Conventionally, gasification equipment that generates gasification gas using raw materials such as coal, biomass, and tire chips as fuel has been developed.

  FIG. 4 shows an example of a gasification facility under development. The gasification facility is stored in a raw material storage device 1 such as a hopper in which raw materials are stored and the raw material storage device 1. A cutting device 2 that cuts out the raw material, and the raw material is fed from the cutting device 2 through the raw material supply pipe 3 through the slide gate 4 and forms a fluidized bed 5 of a fluid medium (eg, sand, limestone) by steam. Gasification furnace 6 for gasifying raw materials (coal, biomass, tire chips, etc.) to generate gasification gas and combustible solids, and gasification gas for extracting the gasification gas generated in the gasification furnace 6 A medium separation device 8 such as a spray tower or a hot cyclone that is provided in the middle of the pipe 7 and separates the fluidized medium from the gasified gas, and a flammable solid produced in the gasification furnace 6 together with the fluidized medium is a loop seal 9. Is introduced through A combustion furnace 11 that forms a fluidized bed 10 with a fluid gas such as air or oxygen and burns the combustible solid, and an exhaust gas pipe 12 that extracts combustion exhaust gas from the combustion furnace 11 and that is provided in the middle It has a configuration comprising a medium separation device 15 such as a hot cyclone for separating the fluid medium from the exhaust gas and supplying the separated fluid medium to the gasification furnace 6 through the downcomer 13 and the loop seal 14. .

  In the gasification facility as described above, the fluidized bed 5 is formed by steam in the gasification furnace 6 during normal operation, and raw materials such as coal, biomass, tire chips, etc. stored in the raw material storage device 1 are formed here. When the material is fed from the cutting device 2 through the raw material supply pipe 3 through the slide gate 4, the raw material is vaporized and gasified to produce gasified gas and combustible solids, which are generated in the gasification furnace 6. The combustible solid content is introduced into the combustion furnace 11 in which the fluidized bed 10 is formed with the fluidizing gas through the loop seal 9 together with the fluid medium, and the combustible solid content is combusted and the combustion The combustion exhaust gas from the furnace 11 is introduced into a medium separation device 15 such as a hot cyclone through an exhaust gas pipe 12, and the fluid separation medium is separated from the combustion exhaust gas in the medium separation device 15, and the separation is performed. Bed material is returned to the gasification furnace 6 through the downcomer 13 and loop seal 14, it is circulated.

Here, the fluidized medium that has become high in temperature due to the combustion of combustible solids in the combustion furnace 11 passes through the exhaust gas pipe 12 together with the combustion exhaust gas, and is separated by the medium separation device 15, via the downcomer 13 and the loop seal 14. By supplying the gasification furnace 6 to the gasification furnace 6, the high temperature of the gasification furnace 6 is maintained, and the gas generated by the thermal decomposition of the raw material and the residual raw material react with the vapor, thereby causing a water gasification reaction [ C + H ₂ O = H ₂ + CO] or hydrogen conversion reaction [CO + H ₂ O = H ₂ + CO ₂ ] occurs, and combustible gasification gas such as H ₂ or CO is generated.

  The gasification gas generated in the gasification furnace 6 passes through a gasification gas pipe 7, and dust and the like are separated and removed by a medium separation device 8 such as a spray tower or a hot cyclone. Etc.

  Incidentally, when heat is insufficient during normal operation in the gasification facility, that is, when sufficient heat for gasification of the raw material cannot be obtained in the gasification furnace 6, the gasification equipment 6 is supplied to the gasification furnace 6. Fuels such as coal, biomass, tire chips, etc., that are the same as the raw material to be supplied are supplementarily charged into the combustion furnace 11 and burned to compensate for the insufficient heat. In addition, during the circulation preheating operation in the previous stage before the normal operation in the gasification facility, the raw material is not charged into the gasification furnace 6, and instead of steam from the bottom of the gasification furnace 6. With the air supplied, the fuel such as coal, biomass, tire chips, etc., was put into the combustion furnace 11 for preheating and burned, and the temperature increased as the fuel burned in the combustion furnace 11 The fluidized medium is separated together with the combustion exhaust gas through the exhaust gas pipe 12 by the medium separation device 15 and supplied to the gasification furnace 6 through the downcomer 13 and the loop seal 14, whereby circulation preheating of the gasification facility is performed. It has come to be.

  For example, Patent Document 1 shows a general technical level related to a gasification facility including a gasification furnace as described above.

JP 2007-112872 A

  By the way, in a boiler or an incinerator that uses coal as fuel, in order to prevent accumulation in the charging chute and backflow of the gas in the furnace, the air is normally pushed in at the charging port, as shown in FIG. In the case of the gasification furnace 6 in such a gasification facility, since the raw material is gasified by steam, the inside of the gasification furnace 6 cannot be made into an air atmosphere, and the raw material is clogged in the raw material supply pipe 3. The gasification gas may flow backward from the gasification furnace to the cutting device 2 or the raw material storage device 1 side.

  In view of such circumstances, the present invention is a gas that can stably feed a raw material into a gasification furnace and can reliably prevent the backflow of the gasification gas from the gasification furnace to the cutting device or the raw material storage device side. It is intended to provide a raw material charging device for the chemical equipment.

The present invention includes a raw material storage device in which raw materials are stored, a cutting device that cuts out raw materials stored in the raw material storage device, and raw materials that are input from the cutting device into a fluidized bed of a fluidized medium through a raw material supply pipe And a raw material charging device of a gasification facility comprising a gasification furnace for gasifying the raw material to generate gasified gas,
In the middle of the raw material supply pipe connecting the cutting device and the gasification furnace, a push ejector that conveys the raw material into the gasification furnace side by steam or inert gas is disposed, and on the entry side of the push ejector A gasification facility comprising a suction ejector for sucking the gasification gas by an ejector effect of steam or an inert gas and returning the gasification gas to the gasification furnace when the gasification gas flows backward from the gasification furnace This is related to the raw material charging apparatus.

  According to the above means, the following operation can be obtained.

  When configured as described above, the raw material stored in the raw material storage device is fed into the gasification furnace from the cutting device through the raw material supply pipe, but is pushed into the gasification furnace side by steam or inert gas by the operation of the push-in ejector. Therefore, it is possible to prevent the raw material from being clogged in the raw material supply pipe without causing the gasification furnace to have an air atmosphere.

  Even if the gasification gas flows backward from the gasification furnace to the raw material supply pipe, the suction gas ejector is provided on the inlet side of the push-in ejector. There is no fear of being sucked back by the ejector effect and returned to the gasification furnace and flowing back to the cutting device or the raw material storage device.

  In the raw material charging device of the gasification facility, in the middle of the raw material supply pipe, a raw material supply chamber to which the raw material is supplied from above is formed, and a push ejector body is provided so as to cover the outer periphery of the raw material supply chamber, A pushing gas supply pipe for supplying steam or an inert gas is connected to the pushing ejector body, and the outer peripheral portion covered with the pushing ejector body in the raw material supply chamber is moved from the pushing gas supply pipe into the pushing ejector body. The pushing ejector can be configured by forming a nozzle hole for injecting the supplied steam or inert gas obliquely downward into the raw material supply chamber.

  Further, in the raw material charging apparatus of the gasification facility, an inlet port to which a suction gas supply pipe for steam or inert gas is connected and a lead-out port to which a gas return pipe leading to the gasification furnace is connected to the same axis. A suction ejector casing is formed by disposing a suction port that extends in a direction and opens in a direction perpendicular to the axis of the introduction port and the discharge port, and introduces the introduction nozzle and the lead-out inside the suction ejector casing. A suction ejector body is constructed by attaching a nozzle to the introduction port and the discharge port at a required interval in the axial direction, and a suction chamber is formed on the inlet side of the push ejector. The suction ejector can be configured by connecting a suction port of the suction ejector body to a suction nozzle protruding from the suction chamber.

  According to the raw material input device of the gasification facility of the present invention, the raw material can be stably supplied to the gasification furnace, and the backflow of the gasification gas from the gasification furnace to the cutting device or the raw material storage device can be ensured. An excellent effect that it can be prevented can be achieved.

1 is an overall schematic configuration diagram showing an embodiment of the present invention. It is a principal part expanded sectional view which shows the pushing ejector in the Example of this invention, Comprising: It is the II section equivalent figure of FIG. FIG. 3 is an enlarged cross-sectional view showing a main part of a suction ejector according to an embodiment of the present invention, corresponding to a part III in FIG. 1. It is a whole schematic block diagram which shows an example of the gasification equipment provided with the gasification furnace and combustion furnace which are being developed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same components, and the basic configuration is the same as the conventional one shown in FIG. However, as shown in FIGS. 1 to 3, this embodiment is characterized by steam or inert gas (nitrogen or the like) in the middle of the raw material supply pipe 3 that connects the cutting device 2 and the gasification furnace 6. ) To push the raw material into the gasification furnace 6 side, and when the gasification gas flows backward from the gasification furnace 6 to the inlet side of the pusher ejector 20, the gasification is performed. A suction ejector 30 is provided in which the gas is sucked by the ejector effect of steam or inert gas and returned to the gasification furnace 6.

  As shown in FIG. 2, the push ejector 20 forms a raw material supply chamber 21 to which a raw material is supplied from above in the middle of the raw material supply pipe 3 and pushes the ejector so as to cover the outer periphery of the raw material supply chamber 21. A main body 22 is provided, a push gas supply pipe 23 for supplying steam or an inert gas is connected to the push ejector main body 22, and the outer peripheral portion covered with the push ejector main body 22 of the raw material supply chamber 21 is pushed into the required portion. A nozzle hole for injecting the vapor or inert gas supplied from the gas supply pipe 23 into the push-in ejector body 22 into the raw material supply chamber 21 obliquely downward; By injecting steam or inert gas supplied from the pipe 23 into the raw material supply chamber 21 from the nozzle hole 24 through the push ejector body 22, the raw material is pushed into the gasification furnace 6 side. Some as a possible transport way.

  As shown in FIG. 2, a drain discharge pipe 25 is connected to the lower portion of the push ejector body 22, and a steam trap 26 (see FIG. 1) is provided in the middle of the drain discharge pipe 25, and the outer periphery of the push ejector 20. Is provided with a heat insulating material 27.

  Further, as shown in FIG. 3, the introduction port 32 to which the suction gas supply pipe 31 for steam or inert gas is connected and the outlet 34 to which the gas return pipe 33 leading to the gasification furnace 6 is connected are on the same axis. A suction ejector casing 36 is formed by disposing a suction port 35 that extends in the direction and opens in a direction perpendicular to the axis of the inlet port 32 and the outlet port 34, and the inside of the suction ejector casing 36. A suction ejector body 39 is constructed by attaching the introduction nozzle 37 and the discharge nozzle 38 to the introduction port 32 and the discharge port 34 at a required interval in the axial direction, and the suction side of the push-in ejector 20 is suctioned. A suction chamber 41 having a nozzle 40 protruding therefrom is formed, and the suction port 35 of the suction ejector body 39 is connected to the suction nozzle 40 protruding from the suction chamber 41. More, it has configured the suction ejector 30. In addition, the introduction nozzle 37 has the same flow path cross-sectional area from the inlet side to the outlet side, and the introduction reduced taper pipe part 37a in which the flow path sectional area is gradually reduced from the inlet side to the outlet side. An introduction straight pipe part 37b and an introduction expansion taper pipe part 37c whose flow passage cross-sectional area is gradually expanded from the inlet side to the outlet side are formed. Inside the outlet nozzle 38, the inlet side to the outlet side are formed. The outlet reduced tapered pipe line portion 38a in which the flow passage cross-sectional area is gradually reduced, the outlet straight pipe portion 38b having the same flow passage cross-sectional area from the inlet side to the outlet side, and the flow from the inlet side to the outlet side A lead-out expanded tapered pipe section 38c is formed in which the road cross-sectional area is gradually expanded.

  Next, the operation of the above embodiment will be described.

  When configured as described above, raw materials such as coal, biomass, tire chips and the like stored in the raw material storage device 1 are fed from the cutting device 2 to the gasification furnace 6 via the slide gate 4 through the raw material supply pipe 3. In the push ejector 20, the steam or inert gas supplied from the push gas supply pipe 23 into the push ejector body 22 is injected obliquely downward into the raw material supply chamber 21 from the nozzle hole 24, whereby the raw material is injected. Since it is conveyed so as to be pushed into the gasification furnace 6, it is possible to prevent the raw material from being clogged in the raw material supply pipe 3 without making the gasification furnace 6 an air atmosphere. Become.

  Here, since a heat insulating material 27 is provided on the outer periphery of the pushing ejector 20, particularly when steam is supplied from the pushing gas supply pipe 23 as a gas for conveying the raw material to the gasification furnace 6 side, While the steam is difficult to cool and the generation of drain is suppressed, even if the drain is generated, the drain is reliably recovered from the drain discharge pipe 25 through the steam trap 26 and is effective.

  Even if the gasification gas flows backward from the gasification furnace 6 to the raw material supply pipe 3, the suction ejector 30 is provided on the inlet side of the pushing ejector 20. Alternatively, when an inert gas is supplied to the inlet 32 of the suction ejector casing 36 of the suction ejector main body 39 and is circulated from the inlet nozzle 37 to the outlet nozzle 38, the gasified gas flows from the suction chamber 41 to the suction nozzle 40 and the suction nozzle 38. A suction ejector body 39 is sucked through the port 35 by the ejector effect of the steam or the inert gas, is returned to the gasification furnace 6 through the gas return pipe 33 from the outlet 34, and is connected to the cutting device 2 and the raw material storage device 1 side. There is no worry of backflow.

  In this way, the raw material can be stably charged into the gasification furnace 6, and the backflow of the gasification gas from the gasification furnace 6 to the cutting device 2 or the raw material storage device 1 can be reliably prevented.

  In addition, the raw material input device of the gasification facility 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.

DESCRIPTION OF SYMBOLS 1 Raw material storage apparatus 2 Cutting apparatus 3 Raw material supply pipe 5 Fluidized bed 6 Gasification furnace 20 Pushing ejector 21 Raw material supply chamber 22 Pushing ejector main body 23 Pushing gas supply pipe 24 Nozzle hole 30 Suction ejector 31 Suction gas supply pipe 32 Inlet 33 Gas return pipe 34 Outlet port 35 Suction port 36 Suction ejector casing 37 Introducing nozzle 38 Outlet nozzle 39 Suction ejector body 40 Suction nozzle 41 Suction chamber

Claims (3)

A raw material storage device in which the raw material is stored, a cutting device for cutting out the raw material stored in the raw material storage device, and a raw material is fed from the cutting device into a fluidized bed of a fluidized medium through a raw material supply pipe A gasification facility raw material charging device including a gasification furnace that generates gasification gas by gasification of
In the middle of the raw material supply pipe connecting the cutting device and the gasification furnace, a push ejector that conveys the raw material into the gasification furnace side by steam or inert gas is disposed, and on the entry side of the push ejector A gasification facility comprising a suction ejector for sucking the gasification gas by an ejector effect of steam or an inert gas and returning the gasification gas to the gasification furnace when the gasification gas flows backward from the gasification furnace Raw material input device.   In the middle of the raw material supply pipe, a raw material supply chamber for supplying the raw material from above is formed, and a push ejector body is provided so as to cover the outer periphery of the raw material supply chamber, and steam or an inert gas is provided in the push ejector main body. Connect the push gas supply pipe that supplies the raw material, and supply the raw material with the steam or inert gas supplied from the push gas supply pipe into the push ejector body to the outer peripheral part of the raw material supply chamber covered by the push ejector body The raw material charging device for a gasification facility according to claim 1, wherein the pushing ejector is configured by forming a nozzle hole for injecting obliquely downward into the indoor portion.   An inlet port to which a suction gas supply pipe for steam or inert gas is connected and an outlet port to which a gas return pipe leading to the gasification furnace is connected so as to extend in the same axial direction. A suction ejector casing is formed by disposing a suction port that opens to extend in a direction orthogonal to the axis of the outlet, and an introduction nozzle and a discharge nozzle are arranged inside the suction ejector casing, and the axial direction of the introduction port and the discharge port The suction ejector main body is configured by attaching to the suction ejector at a required interval, and a suction chamber with a suction nozzle projecting is formed on the entry side of the push ejector, and the suction nozzle projecting from the suction chamber The raw material charging device for a gasification facility according to claim 1 or 2, wherein the suction ejector is configured by connecting a suction port of a suction ejector body.

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