JP2004131578A - Biomass conversion type gas generator equipped with discharge mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biomass conversion type gas generator equipped with a discharge mechanism which makes it possible to rapidly and safely discharge a material accumulated in an oven body for maintenance or inspection and when an abnormality occurs in a biomass conversion type gas generator wherein an accumulated vegetable fuel comprising e.g. sawdust is subjected to oxidation and pyrolysis reactions in the oven body. <P>SOLUTION: The biomass conversion type gas generator is equipped with: a discharge mechanism 102 having a discharge hole 90 at the lower part of the peripheral wall 14 of an oven body 12, with a screw 90 arranged in the discharge hole 90 and rotated by a screw driving means 94, so as to discharge a material 19 accumulated in the oven into the outside of the oven by the revolving motion of the screw 90; a water storage tank 108 outside the peripheral wall of the oven body 12 to introduce a material discharged by the discharge mechanism 102 from the oven into the tank 108; and means 120, 122, 124 for conveying the discharged material from the inside of the water storage tank 108 to a prescribed place 126. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
【Technical field】
TECHNICAL FIELD The present invention relates to a biomass conversion type gas generator that generates combustible useful gas such as carbon monoxide and hydrogen using plant fuel such as plants and algae as a raw material, and particularly relates to a furnace for maintenance, inspection and emergency. The present invention relates to a biomass conversion type gas generator having a novel structure, which has a discharge mechanism capable of rapidly and safely discharging plant fuel and its residue remaining therein.
[0002]
[Background Art]
Conventionally, biomass conversion, which is one of the energy utilization technologies by gasification of biomass, has been used as a kind of utilization equipment for woody waste such as sawdust, shavings, wood chips, and thinned wood that are generated in large quantities in the wood processing industry. Gas generators of the type are known.
[0003]
In such a gas generator, for example, as shown in Patent Document 1, an air intake port is provided at a lower portion of a vertical hollow furnace body, and a charging pipe extending substantially vertically through an upper wall is provided. Then, while supplying sawdust into the furnace from the fuel tank installed above the furnace body through the input pipe, the sawdust after pyrolysis is oxidized and burned at the bottom of the sawdust accumulated in the furnace, and the heat generated generates By drying and thermally decomposing the sawdust, a pyrolysis gas is generated. The pyrolysis gas generated in the middle to lower layers of the sawdust accumulated in the furnace is cooled and filtered by permeating the accumulated sawdust, and is then sucked through a gas suction pipe opened at the top of the furnace body. After that, dust and tar are removed by an appropriate purification device such as a cyclone to be used as a clean combustible gas. It becomes.
[0004]
[Patent Document 1]
Published Japanese Utility Model Application No. Hei 6-84109
By the way, such a gas generator can theoretically generate no residue after pyrolysis as long as sawdust is used as fuel, and can be operated continuously for a long period of several years or more. It is necessary to interrupt the operation for regular inspection and maintenance, or to cope with any trouble that has occurred. In addition, for inspection, maintenance, troubleshooting, and the like, it is necessary to quickly discharge outside the furnace any sawdust and oxidative and pyrolytic residues remaining in the furnace, such as silicon dioxide contained in bark.
[0006]
However, in order to carry out the pyrolysis reaction stably, in addition to the fact that vegetable fuel is always deposited at a height of several meters in the furnace, in addition to ensuring the heat insulation and airtightness of the furnace to the outside, In order to perform the operation safely and stably, the furnace body is constructed of a thick peripheral wall made of concrete, fire-resistant brick or the like, and only a small discharge port is provided at a lower portion of the furnace body. For this reason, during inspections and the like described above, a large amount of sediment etc. in the furnace must be manually scraped out of the furnace from a small discharge port provided at the bottom of the furnace body using a scoop or the like and discharged to the outside of the furnace. Was required, and the work required a great deal of labor and time.
[0007]
In addition, such a manual discharge operation of the sediment in the furnace must be performed in a poor environment due to generated gas filled in the furnace and dust generated when the sediment in the furnace is discharged. It was cumbersome, requiring recognition and specialized knowledge and experience.
[0008]
In particular, when discharging furnace deposits when dealing with any kind of troubles, since the discharged materials are still in a high temperature state, the work becomes more difficult, and effective and prompt measures are taken for the troubles. There was a problem that it was difficult.
[0009]
[Solution]
Here, the present invention has been made in view of the above-described circumstances, and the problem to be solved is to form a large discharge port that impairs the heat insulation and confidentiality of the furnace body. It is another object of the present invention to provide a biomass conversion type gas generator having a novel structure provided with a discharge mechanism capable of discharging the sediment and the like in the furnace easily, safely, and quickly out of the furnace.
[0010]
[Solution]
Hereinafter, embodiments of the present invention made to solve such problems will be described. The components employed in each of the embodiments described below can be employed in any combination as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or based on the invention ideas that can be understood by those skilled in the art from the descriptions. It should be understood that it is recognized on the basis of.
[0011]
(Aspect 1 of the present invention)
In the first aspect of the present invention, the plant fuel is supplied to the inside of the furnace body from an input pipe disposed through the upper wall of a vertical hollow furnace body having a cylindrical peripheral wall portion. In the biomass conversion type gas generator in which the sediment of the vegetable fuel is oxidized and thermally decomposed inside and the generated gas is sucked and collected outside the furnace, a discharge hole is provided at a lower portion of a peripheral wall portion of the furnace body. In addition, a screw driving means for rotating and driving the screw is provided while a screw is inserted and arranged in the discharge hole, and a discharge mechanism for discharging the deposits in the furnace to the outside of the furnace by rotating the screw is configured. On the other hand, a water storage tank is provided outside the peripheral wall portion of the furnace body so that the discharge discharged from the furnace by the discharge mechanism is guided into the water storage tank, and the discharge is stored in the water storage tank. That a transport means for transporting from inside to a predetermined place is provided, And butterflies.
[0012]
In the biomass conversion type gas generator configured as described above according to this aspect, the screw disposed at the lower portion of the peripheral wall of the furnace constitutes a conveyor that discharges deposits in the furnace to the outside through the discharge holes. In particular, since the sediment in the furnace and the residue due to oxidation or thermal decomposition are basically powdery or granular, even if compacted, the screw-type conveyor can reduce the efficiency through small discharge holes. It can be drained out. In addition, since the discharge from the furnace is immediately led to the water storage tank and brought into contact with water, a secondary fire or the like can be avoided. Since the material contains water, the handling becomes easy, and the deterioration of the environment due to the discharge becoming dust and being rolled up can be prevented.
[0013]
Therefore, according to the present invention, deposits and the like in the furnace can be automatically and safely and promptly removed from the furnace without providing a large discharge hole in the furnace body peripheral wall so as to impair the heat insulation and airtightness of the furnace. It is possible to realize a discharge mechanism capable of discharging to the outside, whereby it is possible to easily discharge the sediment in the furnace to the outside of the furnace during maintenance and inspection of the gas generator, and Even if any trouble occurs, it is possible to quickly and safely discharge the furnace deposits safely and promptly.
[0014]
(Aspect 2 of the present invention)
An aspect 2 of the present invention is the biomass conversion type gas generator according to the aspect 1, wherein the discharge hole is formed in the peripheral wall portion so as to be able to be closed, and the discharge hole is opened as necessary. The screw can be inserted and arranged in the discharge hole. In this embodiment, by closing the discharge hole during normal operation, it is possible to prevent gas leakage, inflow of outside air, and the like through the discharge hole. Further, since the screw is also removed during normal operation, damage to the discharge mechanism including the screw can be prevented.
[0015]
However, the biomass conversion type gas generator according to the first aspect of the present invention is not limited to the second aspect, and it is also possible to always open a discharge hole, and to insert a screw into the discharge hole. You may make it always insert and arrange. In such a case, in order to prevent gas leakage from the inside of the furnace to the outside of the furnace or inflow of outside air from outside the furnace into the furnace through the discharge hole, the opening outside the furnace of the discharge hole is used. Is desirably opened in water stored in an external water tank or the like.
[0016]
(Embodiment 3 of the present invention)
A third aspect of the present invention is the biomass conversion type gas generator according to the first or second aspect, wherein a plurality of the discharge holes are provided at a predetermined distance from each other in a circumferential direction of the peripheral wall portion, and each of the discharge holes is provided for each of the discharge holes. The screws are inserted into the holes, respectively, while the water storage tank is provided so as to extend in the circumferential direction outside the peripheral wall portion, and the plurality of screws guide the discharged material into the water storage tank. The feature is that it is. In this aspect, the small discharge holes and the screws allow the deposits in the furnace to be discharged more efficiently. In addition, since the discharged substances respectively discharged by the screws from the plurality of discharge holes are collected in one water storage tank, the handling of the discharged substances does not become complicated. In addition, by providing a plurality of discharge holes and screws, there is an advantage that even if some of them are malfunctioning, the intended discharge of furnace deposits can be executed.
[0017]
(Embodiment 4 of the present invention)
According to a fourth aspect of the present invention, in the biomass conversion type gas generator according to any one of the first to third aspects, gas supply means for supplying a nitrogen gas and / or a carbon dioxide gas is provided inside the furnace body. Is the feature. In this embodiment, since the oxidation and the thermal decomposition reaction in the furnace can be suppressed by supplying the nitrogen gas or the carbon dioxide gas into the furnace, for example, the deposition in the furnace by the discharge mechanism according to the present invention is performed. Before or during the discharge of materials, the supply of nitrogen gas or carbon dioxide into the furnace by gas supply means to suppress the reaction in the furnace, thereby improving the safety of the discharge operation of sediments in the furnace. It is possible to further improve and to perform the work more quickly.
[0018]
In the fourth aspect, a sensor for detecting at least one of the pressure, temperature, and gas concentration inside the furnace body is provided, and the value of the detection signal of the sensor deviates from a preset allowable range. In such a case, it is also effective to configure an automatic monitoring system for supplying nitrogen gas and / or carbon dioxide gas into the furnace by operating the gas supply means to improve the safety of the operation of the furnace.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
First, FIGS. 1 and 2 schematically show the entire structure of a gas generator 10 as one embodiment of the present invention. The basic structure of the gas generator 10 is known, but will be briefly described first.
[0021]
That is, in FIGS. 1 and 2, reference numeral 12 denotes a furnace body, which is formed by hermetically covering an upper opening of a peripheral wall 14 having a thick large-diameter cylindrical shape with an upper wall 16. The processing chamber 18 is formed in the inside. Then, in the processing chamber 18, strip-like or granular sawdust 19, which is a wood-based fuel as a plant fuel supplied from the outside, is deposited and subjected to treatment such as oxidation and decomposition. Has become. Although not shown in FIG. 1, as shown in FIG. 2, the peripheral wall 14 is, for example, between the inner peripheral wall 11 formed of fire-resistant bricks and the like and the outer peripheral wall 13 formed of reinforced concrete and the like. It is formed with a multi-layered refractory structure filled with sand 15. Further, the inner peripheral surface of the peripheral wall 14 exposed to the processing chamber 18 may have a cylindrical shape extending substantially vertically, or may have a tapered cylindrical shape whose diameter decreases upward. Further, the size of the furnace body 12 is not particularly limited, but in a practical size, the outer diameter dimension and the height dimension of the peripheral wall 14 all reach several meters or more.
[0022]
Further, in the processing chamber 18 formed in the furnace body 12, a roast (grate) 20 is installed at a lower portion, and in the air supply space 22 formed below the roast 20, a furnace body 12 is provided. The inside end of an air supply pipe 24 disposed through the inside and outside of the peripheral wall 14 is opened. The outer end of the air supply pipe 24 is connected to the atmosphere via a control valve 26. By operating the control valve 26, an appropriate amount of air is supplied from the outside through the air supply pipe 24. It is supplied to the processing chamber 18. In addition, an appropriate number of air supply pipes 24 can be provided on the periphery of the furnace body 12. An ignition port 25 for an ignition process is provided at a lower portion of the peripheral wall 14 so as to be able to be closed by a cover member 27.
[0023]
Further, a pressure release device 28 is provided at each of the upper end and the lower end of the peripheral wall 14 of the furnace body 12. In the pressure release device 28, a pressure release pipe 30 is provided so as to penetrate through the peripheral wall 14 in and out, and the inner end of the pressure release pipe 30 is opened to the processing chamber 18, while the outer end is vertically downward. It is constructed by extending the tip part, immersing the tip part in the water 34 stored in the water seal container 32, and opening the water. The level of the water 34 in the water seal container 32 is maintained at a predetermined water level by a leveling means (not shown). In addition, an appropriate number of pressure release pipes 30 and water-sealed containers 32 can be provided on the periphery of the furnace body 12.
[0024]
A gas outlet pipe 36 is provided through the upper wall 16 of the furnace body 12, and a lower end of the gas outlet pipe 36 is opened to the processing chamber 18. A gas suction fan 40 is connected to the other end via a cyclone 38. Then, by applying a negative pressure generated by the operation of the gas suction fan 40 to the processing chamber 18 through the gas extraction pipe 36, the generated gas generated in the processing chamber 18 by processing the sawdust 19 is removed from the gas extraction pipe 36. The tar and dust are separated by the cyclone 38 and sent to the subsequent cleaning device.
[0025]
Further, a charging pipe 42 is provided on the upper wall 16 of the furnace body 12 so as to penetrate a central portion thereof. The charging pipe 42 has a cylindrical shape, and is substantially fixedly supported by the furnace body 12 such that the central axis extends in the vertical direction. In addition, in order to prevent clogging of fuel (sawdust), the input pipe 42 may be provided with a taper that gradually expands downward. The input pipe 42 has an upper end protruding upward from the upper wall 16 of the furnace body 12 at a predetermined height, while a lower end thereof is inserted into the processing chamber 18 of the furnace body 12. The opening is located at an intermediate portion in the height direction of the chamber 18.
[0026]
Further, a fuel tank 44 is placed and fixed on the upper wall 16 of the furnace body 12. The fuel tank 44 is a hollow circular container having a circular bottom wall 46 and a cylindrical tube wall 48. A gas-permeable mesh such as a wire mesh is attached to an upper opening of the fuel tank 44. A fuel port 50 is provided on a part of the body. A hopper 52 is disposed above the fuel tank 44, and a discharge port formed at a lower end of the hopper 52 is opened above the fuel receiving port 50 of the fuel tank 44.
[0027]
Then, sawdust is supplied from a not-shown external storage tank to the hopper 52 through the transport pipe 56 by a pneumatic conveyor or the like using the transport fan 54. Further, by opening and closing the discharge port of the hopper 52 with a handle lever or the like, sawdust supplied to the hopper 52 can be guided into the fuel tank 44 as necessary.
[0028]
Further, a circular supply port 64 is provided in the bottom wall 46 of the fuel tank 44 near the outer peripheral edge, and a circular supply port 64 is provided to the supply port 64. The upper end opening of the pipe 42 is mounted. Thus, sawdust in the fuel tank 44 is guided into the charging pipe 42 and supplied to the processing chamber 18 of the furnace body 12 through the charging pipe 42 by the action of gravity. It is desirable that the fuel tank 44 be provided with stirring blades for stirring the sawdust and guiding the sawdust to the supply port 64 and to be driven to rotate.
[0029]
Further, an appropriate number of gas introduction pipes 77 are attached to the furnace body 12 through the peripheral wall 14, and the inner ends of the gas introduction pipes 77 are opened to the processing chamber 18 in the furnace. On the other hand, a cylinder 79 of an inert gas such as nitrogen gas or carbon dioxide gas (carbon dioxide gas) is connected to the outer end of each gas introduction pipe 77 via an electromagnetic valve 75. When an abnormality is detected by the monitoring means for detecting an abnormality in the operation state, the solenoid valve 75 is opened immediately, an inert gas is supplied to the processing chamber 18 in the furnace, and the generated gas is discharged. In addition, reactions such as oxidation in the furnace can be stopped.
[0030]
Monitoring means includes a gas sensor such as a temperature sensor 80 for detecting a temperature at an appropriate portion of the processing chamber 18, a pressure sensor 82 for detecting a pressure in the processing chamber 18, and an O ₂ sensor for detecting a reaction state in the processing chamber 18. It is configured to include a concentration sensor 84 and a gas leak sensor 86 such as a CO sensor installed outside the furnace and detecting gas leak from the processing chamber 18. The detection signals of these sensors 80, 82, 84, 86 are input to control means (not shown), and the control means determines whether each detection signal falls within a preset allowable range. ing. If the detection signal of any of the sensors 80, 82, 84, 86 is out of the allowable range, it is determined that some abnormality has occurred, and a drive signal is sent to the control mechanism of the solenoid valve 75. Then, the electromagnetic valve 75 is opened, and an inert gas is supplied from the gas cylinder 79 to the processing chamber 18 through the gas introduction pipe 77.
[0031]
The thermal decomposition of the sawdust 19 by the gas generator 10 having the above-described structure is executed as follows. That is, the sawdust 19 stored in the fuel tank 44 falls through the charging pipe 42 and is supplied to the processing chamber 18 in the furnace body 12. In the processing chamber 18, sawdust 19 is deposited until it is balanced at such a height as to cover the lower end opening of the input pipe 42, and the lowermost portion of the deposit is ignited. The ignition is performed through the ignition port 25, and thereafter, the ignition port 25 is closed with a refractory brick or the like. When the air is sucked into the processing chamber 18 from the air supply pipe 24 at the lower part of the processing chamber 18 by the suction of the gas suction fan 40 and the air rises in the deposits of the sawdust 19 from the roaster 20, the sawdust 19 is oxidized and burned. As a result, a glowing portion is generated in the lower core of the processing chamber 18. Then, the sawdust 19 deposited in the processing chamber 18 is oxidized and reduced (thermally decomposed) one after another by continuously supplying the sawdust 19 above the deposit of the sawdust 19 through the input pipe 42 to generate a furnace. Generates gas (combustible useful gas) and tar content. The generated high-temperature furnace gas and tar content are subjected to heat exchange and filtration by relatively low-temperature sawdust 19 which is filled in the ascending process. Then, the generated furnace gas is suctioned and taken out from the upper part of the processing chamber 18 through the gas take-out pipe 36, and dust removal or tar separation is performed by a cyclone 38 or the like to perform a cleaning treatment so that a desired effective gas is taken out. To
[0032]
Here, in the gas generator 10 of the present embodiment, three discharge holes 90 penetrating inward and outward are provided in the lower part of the peripheral wall 15 of the furnace body 12. In the present embodiment, one discharge hole 90 is formed to penetrate the lid member 27 that closes the ignition port 25 for ignition. A cylindrical sleeve 92 is fitted into each discharge hole 90 and penetrates the peripheral wall 15 substantially horizontally, and is opened in the processing chamber 18 on the upper surface of the roaster 20. Further, although not explicitly shown in the drawings, each discharge hole 90 can be hermetically covered by using a lid formed of a refractory material and filling mortar as necessary. During the normal operation as described above, each of the discharge holes 90 is maintained in a cover state.
[0033]
Further, a gantry 94 is installed outside the furnace body 12 at a position outside the discharge holes 90 and on an extension of the discharge holes 90 in the tube axis direction. A screw conveyor 102 having a screw 98 and a driving means 100 is supported by the gantry 94 and the outer retaining wall 96. The screw conveyor 102 has a structure in which the screw 98 and the driving means 100 are supported as a whole in a reciprocating manner on the pipe axis of the discharge hole 90 by a guide rail (not shown) provided on the gantry 94 and the retaining wall 96. When the screw conveyor 102 is retracted, the screw 98 is completely pulled out from the discharge hole 90 and held as shown by the phantom line in FIG. The hole 90 can be hermetically covered with a lid (not shown). On the other hand, when the screw conveyor 102 is in the forward state, as shown in FIGS. 2 and 3, the screw 98 is inserted into the discharge hole 90 to be in the inserted state, and the leading end portion is in the processing chamber 18 in the furnace. To reach the approximate center.
[0034]
In addition, when the screw conveyor 102 is in the advanced state, the external cylinder 104 externally mounted on the base end of the screw 98 is positioned at the outer opening of the sleeve 92 provided through the peripheral wall 14 of the furnace body 12. The sleeve 92 and the outer cylinder 104 constitute a transport sleeve for the screw conveyor 102 by being abutted on the same central axis and connected in the axial direction. Note that a discharge port 106 that opens downward is provided on the base end side (the right side in FIG. 3) of the outer cylinder 104.
[0035]
When the screw 98 is rotated by the driving means 100, the sawdust 19 and the deposits of the reaction residue deposited in the processing chamber 18 of the furnace body 12 are sequentially transferred by the screw 98 to the transfer sleeve 92, It is guided into 104, discharged from the processing chamber 18, and sent outside (to the right in FIG. 3) inside the transfer sleeves 92 and 104. In-furnace sediments sent in the axial direction in the transfer sleeves 92 and 104 are transferred from the transfer sleeves 92 and 104 to the outside of the furnace body 12 through the discharge port 106 formed at the base end of the outer cylinder 104. It is being discharged.
[0036]
On the other hand, outside the peripheral wall 14 of the furnace body 12, a water storage tank 108 extending so as to surround the peripheral wall 14 is formed. As shown in FIG. 4, the water storage tank 108 has a water channel 110 having a shallow bottom rectangular cross section supported by a gantry, and a deep water collecting reservoir 112 formed at one end of the water channel 110. It is constituted by. The water channel 110 extends around the circumference of the peripheral wall 14 with a length of less than one round. The discharge ports 106 of the above-described three screw conveyors 102 are respectively opened on the water channel 110. In short, the in-furnace sediment carried out of the processing chamber 18 by the screw conveyor 102 is discharged from the discharge port 106, immediately drops into the water channel 110, and is guided.
[0037]
An electric pump 116 is installed in the water storage tank 108 so as to connect a water collecting basin 112 formed at one end of the water channel 110 to the other end 114 of the water channel 110. Then, the electric pump 116 discharges the water absorbed from the water collecting basin 112 to the other end 114 of the water channel 110 through a filter or the like as necessary, thereby collecting water over the entire length of the water channel 110. The water flow toward the water basin 112 is always generated.
[0038]
Furthermore, a water wheel 118 is installed in the water channel 110 at an appropriate location, preferably slightly downstream of the opening of the discharge port 106 of the screw conveyor 102, and the water channel 110 is rotated by rotating the water wheel 118. The falling material (discharge of sediment in the furnace) floating on the surface layer of the water that is caused to flow is forcedly settled and submerged by the blades of the water wheel 118.
[0039]
Further, conveyors 120 and 122 are installed in the water collecting box 112 as transporting means. In particular, in the present embodiment, the net conveyor 120 is installed at the bottom of the water collecting basin 112, and the scraping conveyor 122 is installed near the water surface of the water collecting basin 112, and the water is circulated in the waterway 110 and the water collecting basin 112. Among the out-of-furnace discharge collected in the water collecting basin 112 by the water flow being squeezed, the sediment in the water collecting basin 112 is collected by the net conveyor 120 and is carried out from the water collecting basin 112, The floating material in the water collecting basin 112 is collected by the scraping conveyor 122 and is carried out from the water collecting basin 112. Then, the out-of-furnace discharge collected from the water collecting box 112 by these two conveyors 120 and 122 is placed on an external unloading conveyor 124 and conveyed to an appropriate storage 126 provided in advance to be collected. I have. The storage 126 is desirably provided outside the building where the furnace body 12 is installed. Further, the storage 126 is constituted by, for example, a hole dug down in the ground, and is filled and filled with sand during a normal operation, and is used by removing sand when necessary. It is desirable to ensure safety by immediately putting sand on the top after all the waste has been thrown in. Further, the out-of-furnace effluent collected in the storage 126 can be reused as fuel at a later date.
[0040]
The net conveyor 120 and the scraping conveyor 122 each have a net-shaped or plate-shaped fin mounted on the outer peripheral surface of an endless belt that is driven to circulate. Conventionally known ones adopted in the above-mentioned and the like can be appropriately adopted, so that detailed description is omitted here. However, any device can be used as long as it can take out the out-of-furnace waste from the water collecting reservoir 112 to the outside, and a scraping device or the like using a net-like bucket can also be appropriately employed.
[0041]
In the gas generator 10 having the above-described structure, each of the discharge holes 90 provided in the peripheral wall 14 of the furnace body 12 is opened at the time of periodic maintenance, management, or the like, or when any abnormality occurs. By installing the screw conveyor 102 therein, the screw conveyor 102 allows the deposit (19) in the furnace to be quickly discharged to the outside of the furnace without manual operation. The fired sediment (19) is immediately brought into contact with the water stored in the water storage tank 108 to extinguish and lower the temperature, so that secondary disasters such as fire can be advantageously prevented. Excellent safety can be ensured.
[0042]
Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention is not to be construed as being limited in any way by the specific description in such embodiments. Based on the knowledge of the present invention, various changes, modifications, improvements, and the like can be carried out, and any of such embodiments does not depart from the spirit of the present invention. It goes without saying that it is included within.
[0043]
For example, in the above-described embodiment, a specific example in which the present invention is applied to a biomass conversion type gas generator using sawdust as a fuel has been described, but other examples include, for example, `` okara '' and The present invention can be applied to various biomass conversion type gas generators using various plant fuels such as coffee bean scum, straw waste, dried laver, algal chips, and the like, or a mixture thereof.
[0044]
Further, in the above-described embodiment, the screw conveyor 102 is provided so as to be retractable, and the discharge hole 90 is closed with the refractory except at the time of discharging the in-furnace deposits. It is also possible to keep the screw hole 102 open at all times and the screw conveyor 102 is always located there. In this case, it is needless to say that the screw conveyor 102 has sufficient heat resistance and the like. In addition, the external opening of the discharge port 106 of the outer cylinder 104 is opened in the water of the water channel 110. In this case, it is desirable to keep the discharge hole 90 in an airtightly sealed state.
[0045]
Furthermore, the number and positions of the screw conveyors 102 are not limited to those in the embodiment. For example, the screw conveyors 102 may be mounted at different positions in the peripheral wall 14 of the furnace body 12 in the height direction. You may do it.
[0046]
【The invention's effect】
As is apparent from the above description, in the biomass conversion type gas generator having the structure according to the present invention, a screw conveyor is formed at the lower portion of the furnace body peripheral wall portion, and sediments in the furnace are discharged from small discharge holes. It can be discharged quickly and safely to the outside. In addition, since the discharge from the furnace is immediately led to the water storage tank and brought into contact with water, secondary fires and other problems are also effective. Can be prevented. Therefore, work such as maintenance and inspection of the gas generator becomes easy, and even in case of any trouble, by quickly and safely discharging the deposits in the furnace, quick response becomes possible. The safety of the gas generator can be greatly improved.
[Brief description of the drawings]
FIG. 1 is an explanatory longitudinal sectional view showing a schematic structure of a gas generator as one embodiment of the present invention.
FIG. 2 is an explanatory cross-sectional view of the gas generator shown in FIG.
FIG. 3 is an explanatory longitudinal sectional view showing an enlarged main part of a screw conveyor in the gas generator shown in FIG. 1;
FIG. 4 is an explanatory longitudinal sectional view showing a main part of a water storage tank in the gas generator shown in FIG. 1 in an enlarged manner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Gas generator 12 Furnace body 18 Processing chamber 19 Sawdust 24 Air supply pipe 36 Gas extraction pipe 42 Input pipe 44 Fuel tank 90 Drainage hole 102 Screw conveyor 106 Discharge port 108 Reservoir layer 110 Waterway 112 Water collecting section 116 Electric pump 118 Waterwheel 120 Net Conveyor 122 Raising Conveyor 124 External Conveyor

Claims (4)

Vegetable fuel is supplied into the inside of the furnace body from an input pipe disposed through the upper wall of a vertical hollow furnace body having a cylindrical peripheral wall portion, while the plant fuel is supplied inside the furnace body. In a biomass conversion type gas generator that oxidized and thermally decomposed the sediment and collected the generated gas by suction outside the furnace,
A discharge hole is provided at a lower portion of a peripheral wall portion of the furnace body, a screw is inserted and arranged in the discharge hole, and screw driving means for rotating the screw is provided. While forming a discharge mechanism for discharging the sediment in the furnace outside the furnace, a water storage tank is provided outside the peripheral wall of the furnace body, and the discharge discharged from the furnace by the discharge mechanism is stored in the water storage tank. A biomass conversion type gas generator equipped with a discharge mechanism, characterized in that the discharge means is provided with a transfer means for transferring the discharged material from the inside of the water storage tank to a predetermined location. 2. The screw according to claim 1, wherein the discharge hole is formed in the peripheral wall so as to be able to be closed, the discharge hole is opened as required, and the screw can be inserted into the discharge hole. 3. Biomass conversion type gas generator. A plurality of the discharge holes are provided at a predetermined distance from each other in the circumferential direction of the peripheral wall portion, and the screws are inserted and arranged in the respective discharge holes, while the water storage tank is circumferentially arranged outside the peripheral wall portion. The biomass conversion type gas generator according to claim 1, wherein the plurality of screws are provided so as to extend in the direction, and the plurality of screws guide the discharged material into the water storage tank. The biomass conversion type gas generator according to any one of claims 1 to 3, wherein gas supply means for supplying nitrogen gas and / or carbon dioxide gas is provided inside the furnace body.

Images