JP2016138695A - Surplus gas combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surplus gas combustion apparatus capable of making a size of a surplus gas combustion part in a flowing direction of the surplus gas shorter than that of the prior art and subsequently restricting a large-sized formation of the apparatus.SOLUTION: A surplus gas combustion apparatus for igniting, at a surplus gas combustion part, surplus gas surplus segment of fuel gas generated by a gasification furnace for generating fuel gas is operated to discharge surplus gas from a discharging port of a surplus gas supply pipe for supplying surplus gas to the surplus gas combustion part to ignite it. There is provided ignition means for igniting surplus gas discharged out of the discharging port of the surplus gas supply pipe at a downstream side of the discharging port of the surplus gas supply pipe in a flowing direction of surplus gas, one or a plurality of helical fins more than one circumference are arranged inside the surplus gas supply pipe at an upstream side than the igniting means or/further one or the plurality of helical fins less than one circumference are arranged.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a surplus gas combustion apparatus that burns surplus gas of a fuel gas generated in a gasification furnace that generates fuel gas in a surplus gas combustion section.

  In a gas engine system that drives an engine using fuel gas generated in a gasification furnace as a raw material using a solid carbonaceous material such as biomass, surplus gas other than that consumed for engine driving is burned in the surplus gas combustion unit A surplus gas combustion apparatus is conventionally known (see, for example, Patent Document 1).

  In such a surplus gas combustion apparatus, when surplus gas is burned in the surplus gas combustion part, the flame does not develop to the peripheral wall of the surplus gas combustion part or the vicinity of the peripheral wall, and the combustion proceeds near the center of the inner periphery. In addition, it is necessary to increase the distance of the combustion volume of the flame in the direction of surplus gas flow in the surplus gas combustion section.

JP 2011-225684 A

  If it does so, the dimension in the flow direction of the surplus gas of the surplus gas combustion part in a surplus gas combustion apparatus will become long, and will cause the enlargement of an apparatus structure accordingly.

  Therefore, the present invention is an excess gas combustion device that burns excess gas in a surplus gas combustion section that is generated in a gasification furnace that generates fuel gas, in the surplus gas combustion section. It is an object of the present invention to provide a surplus gas combustion apparatus that can make the dimension in the direction shorter than before, and that can suppress an increase in the size of the apparatus.

  In order to achieve the above object, the present inventors have obtained the following knowledge. That is, in the surplus gas combustion device that burns surplus gas of surplus fuel gas generated in the gasification furnace that generates fuel gas in the surplus gas combustion unit, flame is burned when surplus gas is burned in the surplus gas combustion unit. The surplus gas combustion part is developed to the peripheral wall of the flue or in the vicinity of the peripheral wall to increase the area where the flame on the inner peripheral surface of the flue contacts or is close to the surplus gas combustion part while ensuring the necessary combustion volume of the flame The size of the flue in the flow direction of excess gas can be suppressed. As a configuration for realizing this, the present inventors set the surplus gas discharged from the discharge port of the surplus gas supply pipe that supplies surplus gas to the surplus gas combustion unit along the peripheral wall of the flue in the surplus gas combustion unit. By adopting a swirl configuration, after the surplus gas is ignited, a flame can be developed to the peripheral wall of the flue or the vicinity of the peripheral wall to increase the area of contact or proximity of the flame on the inner peripheral surface of the flue. Therefore, it is possible to suppress the size of the flue in the surplus gas flow direction of the surplus gas combustion portion while securing the necessary combustion volume of the flame, and accordingly, the size of the surplus gas combustion portion in the surplus gas flow direction is conventionally reduced. The present invention has been completed.

  The present invention is based on such knowledge, and is a surplus gas combustion apparatus that burns surplus gas of surplus fuel gas generated in a gasification furnace that generates fuel gas in an surplus gas combustion unit, the surplus gas combustion device The surplus gas is discharged from a discharge port of a surplus gas supply pipe for supplying the surplus gas to a gas combustion section and burned, and the discharge port of the surplus gas supply pipe in the flow direction of the surplus gas An ignition means for igniting the surplus gas discharged from the discharge port of the surplus gas supply pipe is provided on the downstream side of the surplus gas supply pipe, and one turn is provided inside the surplus gas supply pipe on the upstream side of the ignition means. One or more of the above-described spiral fins are provided, and / or one or more spiral fins of less than one turn are provided.

  According to the present invention, the surplus gas combustion device burns the surplus gas of the fuel gas generated in the gasification furnace that generates the fuel gas in the surplus gas combustion section, and the flow direction of the surplus gas in the surplus gas combustion section Therefore, it is possible to provide a surplus gas combustion apparatus capable of reducing the size of the apparatus in comparison with the prior art, and consequently suppressing an increase in the size of the apparatus configuration.

It is a schematic block diagram which shows the whole structure of the gas engine provided with the surplus gas combustion apparatus which concerns on embodiment of this invention. It is sectional drawing which shows schematic structure of the surplus gas combustion apparatus in the gas engine shown in FIG. It is explanatory drawing for demonstrating the various aspects of the helical fin provided inside an excess gas supply pipe, Comprising: (a) is a figure which shows the example which provides one helical fin more than 1 round. Yes, (b) is a diagram showing an example in which one spiral fin of less than one round is provided, and (c) is a diagram showing an example in which a plurality of spiral fins of one round or more is provided. (D) is a figure which shows the example which provides multiple helical fins for less than one round. It is a schematic block diagram which shows the gas turning part provided with the helical fin shown in FIG. 2, Comprising: (a) is the perspective view which looked at the gas turning part from right above, (b) is a gas It is the perspective view which looked at the turning part from diagonally upward.

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

  First, the overall configuration of a gas engine 100 (gas engine system) including an excess gas combustion device 113 according to an embodiment of the present invention will be described.

  FIG. 1 is a schematic configuration diagram showing an overall configuration of a gas engine 100 including an excess gas combustion device 113 according to an embodiment of the present invention.

  As shown in FIG. 1, the gas engine 100 includes a raw material supply device 101, a gasification furnace 102, a cyclone 103, a gas cooler 104, a scrubber 105, a circulating water tank 106 (water tank), and a cooling tower 107. A gas filter 108, an induction blower 109, a pretreatment unit 110, an engine device (engine power generator 111 in this example), a water sealing tank 112, and a surplus gas combustion device 113 (flare stack). Yes.

  The raw material supply apparatus 101 includes an input hopper 101a that stores a solid carbonaceous material (biomass B in this example) that is a raw material of combustible gas (biogas G in this example), and a biomass B that is stored in the input hopper 101a. And a raw material charging unit 101b for charging the gasification furnace 102 to the gasification furnace 102.

  Here, solid carbonaceous materials include livestock excrement, food waste, paper, black liquor, sewage sludge, wood waste such as wood chips, unused materials, non-food crops such as rice husks, resource crops, etc. Biomass can be exemplified. In addition to biomass, fossil fuels such as coal can be used as the solid carbonaceous material. In this example, the solid carbonaceous material is biomass, and the combustible gas is biogas. Therefore, the gas engine 100 is a biogas engine.

  In this example, the raw material charging unit 101b includes a charging conveyor 101b1 and a charging feeder 101b2. The input conveyor 101b1 conveys the biomass B stored in the input hopper 101a to the input feeder 101b2. The input feeder 101b2 inputs the biomass B conveyed by the input conveyor 101b1 into the gasification furnace 102.

  The gasification furnace 102 generates biogas G from the biomass B input by the raw material supply apparatus 101. The cyclone 103 removes unnecessary substances such as relatively large dust contained in the biogas G generated in the gasification furnace 102.

  The gas cooler 104 is provided in the biogas supply path from the gasifier 102 to the engine power generator 111. The gas cooler 104 cleans the biogas G from which unnecessary substances have been removed by the cyclone 103 with the cleaning water WW, and further cools it with the cooling water CW. The scrubber 105 is further washed by letting the biogas G washed and cooled by the gas cooler 104 submerge in the washing water WW. Circulating water tank 106 stores cleaning water WW supplied to gas cooler 104 and scrubber 105. The cooling tower 107 stores the cooling water CW supplied to the gas cooler 104.

  The gas filter 108 removes unnecessary substances such as relatively small dust contained in the biogas G washed by the scrubber 105 by filtration. The induction blower 109 sucks the biogas G in the biogas supply path on the gasification furnace 102 side and discharges it to the biogas supply path on the engine power generation apparatus 111 side and the biogas supply path on the surplus gas combustion apparatus 113 side.

  The pretreatment unit 110 removes impurities in the biogas G discharged to the biogas supply path on the engine power generation device 111 side by the induction blower 109. The engine power generator 111 burns the biogas G from which impurities have been removed by the pretreatment unit 110.

  The water sealing tank 112 controls the pressure of the biogas G discharged to the biogas supply path on the engine power generation device 111 side by the induction blower 109. The surplus gas combustion device 113 burns surplus biogas SG (an example of surplus gas) that has not been supplied to the engine power generation device 111 and flows when the pressure of the biogas G exceeds the pressure of the water sealing tank 112. It should be noted that a small amount of biogas G as a fuel for the surplus gas combustion device 113 always flows to the surplus gas combustion device 113 via a path (not shown) that bypasses the water sealing tank 112.

  In the gas engine 100 described above, biomass B, which is a solid carbonaceous material, is charged into the gasification furnace 102 by the raw material supply apparatus 101, and combustible biogas G is generated in the gasification furnace 102. The biogas G generated in the gasification furnace 102 flows in the order of the cyclone 103, the gas cooler 104, the scrubber 105, the gas filter 108, and the induction blower 109, and the engine generator 111 side and the surplus gas downstream of the induction blower 109. The gas flows in a branching direction to the combustion device 113 side, the surplus gas combustion device 113 burns surplus biogas SG, and the engine power generation device 111 burns biogas G.

  Specifically, biomass B is stored in the charging hopper 101a, and the biomass B in the charging hopper 101a is charged into the gasifier 102 by the charging conveyor 101b1 and the charging feeder 101b2 in the raw material charging unit 101b.

  In the gasification furnace 102, the biomass B is incompletely burned to generate biogas G. The biogas G generated in the gasification furnace 102 is introduced into the cyclone 103 through the gas pipe 201. Here, the biogas G is a fuel gas containing carbon monoxide as a main component, and the biogas G contains unnecessary substances such as soot, tar, and dust.

  In the cyclone 103, unnecessary substances such as relatively large dust contained in the biogas G are removed by centrifugation. The biogas G from which unnecessary substances such as relatively large dust are removed by the cyclone 103 is introduced into the gas cooler 104 through the gas pipe 202.

  A gas pipe (not shown) through which the biogas G flows is provided in the gas cooler 104. The biogas G in the gas pipe is cleaned with the cleaning water WW and the cooling water that flows around the gas pipe. Cooled with CW. The biogas G cleaned and cooled by the gas cooler 104 is introduced into the scrubber 105 through the gas pipe 203.

  The cooling water CW supplied to the gas cooler 104 is stored in the cooling tower 107, and the cooling water CW in the cooling tower 107 is introduced into the gas cooler 104 through the water distribution pipe 204. The cooling water CW in the distribution pipe 204 is pumped to the gas cooler 104 side by the pump 205, and the biogas G is cooled by the gas cooler 104. The cooling water CW that has cooled the biogas G is led to the cooling tower 107 through the water distribution pipe 206.

  Washing water WW is stored in the scrubber 105, and the biogas G is washed by diving in the washing water WW in the scrubber 105. The biogas G cleaned by the scrubber 105 is introduced into the gas filter 108 through the gas pipe 207.

  The cleaning water WW supplied to the gas cooler 104 and the scrubber 105 is stored in the circulating water tank 106. The cleaning water WW in the circulating water tank 106 is introduced into the gas cooler 104 through the water distribution pipe 209 and is introduced into the scrubber 105 through the water distribution pipe 210 branched from the water distribution pipe 209. The cleaning water WW in the water distribution pipes 209 and 210 is pumped to the gas cooler 104 side and the scrubber 105 side by the pump 211, and the biogas G is cleaned by the gas cooler 104 and the scrubber 105. The cleaning water WW cleaned with the biogas G by the gas cooler 104 is led to the circulating water tank 106 through the water distribution pipe 212, while the cleaning water WW cleaned with the biogas G by the scrubber 105 circulates through the water distribution pipe 213. It is led out to the water tank 106.

  In the gas filter 108, unnecessary substances such as relatively small dust contained in the biogas G are removed by filtration. The biogas G from which unnecessary substances such as relatively small dust are removed by the gas filter 108 is introduced into the induction blower 109 through the gas pipe 214.

  In the attraction blower 109, the biogas G sucked from the biogas supply path on the upstream side of the attraction blower 109 is discharged to the biogas supply path on the downstream side of the attraction blower 109. In other words, the biogas supply path upstream of the induction blower 109 has a negative pressure, while the biogas supply path downstream of the induction blower 109 has a positive pressure. The biogas G is attracted to the downstream biogas supply path by the attracting blower 109.

  The biogas G attracted by the attracting blower 109 is introduced into the engine power generator 111 via the gas supply pipe 215 and the pretreatment unit 110 provided in the gas supply pipe 215. The bioelectric gas G from which impurities have been removed by the pretreatment unit 110 is supplied to the engine power generator 111. In this example, the engine power generation device 111 includes a power generation device (not shown) driven by a gas engine unit (not shown), generates power with the power generation device, and uses exhaust heat of the gas engine unit to supply hot water or air conditioning. It is a cogeneration system used for

  On the other hand, surplus biogas SG that has not been supplied to the engine power generator 111 among the biogas G generated in the gasification furnace 102 is a gas supply pipe that supplies the biogas G from the induction blower 109 to the engine power generator 111 side. The surplus gas is supplied to the surplus gas combustion device 113 through the surplus gas supply pipe 216 branched from the 215 and the water-sealed tank 112 provided in the surplus gas supply pipe 216.

  The surplus gas supply pipe 216 is provided on the upstream side of the water sealing tank 112 and is provided on the downstream side of the water sealing tank 112 and the upstream gas supply pipe 216 a that connects the induction blower 109 and the water sealing tank 112. A downstream gas supply pipe 216b that connects the sealing tank 112 and the surplus gas combustion device 113 is provided.

  In the water sealing tank 112, water is sealed up to a predetermined water level. The water-sealed tank 112 applies surplus biogas SG discharged from the upstream gas supply pipe 216a to apply surplus biogas in the downstream gas supply pipe 216b from the water-sealed tank 112 to the surplus gas combustion apparatus 113. The supply amount of SG is controlled. Thereby, the water sealing tank 112 can control the pressure of the biogas G in the gas supply pipe 215.

  In the surplus gas combustion device 113, surplus biogas SG sent through the upstream gas supply pipe 216a, the water sealing tank 112, and the downstream gas supply pipe 216b is burned in the surplus gas combustion section 113a.

  Next, the surplus gas combustion device 113 in the gas engine 100 will be described below with reference to FIGS. 1 and 2.

  FIG. 2 is a cross-sectional view showing a schematic configuration of the surplus gas combustion device 113 in the gas engine 100 shown in FIG.

  As shown in FIGS. 1 and 2, the surplus gas combustion device 113 has a surplus gas combustion section 113a (in this example, a surplus gas combustion tower) that combusts surplus biogas SG. The surplus gas combustion part 113a is installed so that the longitudinal direction H faces a predetermined direction (the vertical direction Y in this example). The end of the downstream gas supply pipe 216b on the surplus gas combustion device 113 side is inserted into one end (the lower end in this example) of the surplus gas combustion unit 113a. The surplus gas combustion device 113 discharges surplus biogas SG from the discharge port 216c of the surplus gas supply pipe 216 (specifically, the downstream gas supply pipe 216b) that supplies surplus biogas SG to the surplus gas combustion section 113a. It is designed to burn. In this example, the surplus gas combustion device 113 further includes a burner portion 217 (flame holding plate). The burner portion 217 is provided inside one end portion (the lower end portion in this example) of the surplus gas combustion portion 113a. An end portion of the downstream gas supply pipe 216b on the surplus gas combustion device 113 side in the surplus gas combustion portion 113a communicates with a burner portion 217 provided in the surplus gas combustion portion 113a.

  Specifically, the surplus gas combustion unit 113a has a long cylindrical shape (cylindrical shape in this example). The surplus gas combustion unit 113a may be installed in a direction other than the vertical direction Y (for example, the horizontal direction X) in the longitudinal direction H, but is installed along the vertical direction Y in this example. The surplus gas combustion device 113 further includes an installation table 113b. The surplus gas combustion part 113a is installed in the installation stand 113b. The burner part 217 has a hollow shape (in this example, a circular dish shape or a bowl shape in plan view). The burner portion 217 is disposed so that the front side (concave surface side) faces the smoke exhaust port 113c side of the surplus gas combustion portion 113a (in this example, the upper side), and the downstream side gas supply pipe at the center portion The end of 216b is connected from the back side (the side opposite to the concave side). A plurality of air holes 217 a to 217 a are provided in the outer peripheral edge portion of the burner portion 217 along the circumferential direction.

  Further, the surplus gas combustion device 113 ignites ignition means (in this example, the pilot burner 218) that ignites the surplus biogas SG discharged from the discharge port 216c of the surplus gas supply pipe 216 (specifically, the downstream gas supply pipe 216b). ). The pilot burner 218 is provided on the downstream side of the discharge port 216c of the surplus gas supply pipe 216 in the flow direction W of the surplus biogas SG. In this example, the pilot burner 218 is provided on the side surface of the surplus gas combustion unit 113a. The pilot burner 218 supplies a combustible gas g (propane gas in this example) as fuel for igniting the surplus biogas SG into the surplus gas combustion unit 113a from the outside of the surplus gas combustion unit 113a. Yes. A gas cylinder 218a (not shown in FIG. 2, see FIG. 1) is connected to the pilot burner 218. The gas cylinder 218 a supplies the combustible gas g to the pilot burner 218.

  In the surplus gas combustion apparatus 113 having such a configuration, surplus biogas SG that has flowed from the upstream gas supply pipe 216 a to the downstream gas supply pipe 216 b through the water sealing tank 112 is introduced into the surplus gas combustion apparatus 113. Then, the gas is discharged from a burner portion 217 provided at one end portion (the lower end portion in this example) of the surplus gas combustion portion 113a. The surplus biogas SG discharged from the burner unit 217 is ignited and burned by a pilot flame by the combustible gas g supplied from the gas cylinder 218a in the pilot burner 218 provided on the side surface of the surplus gas combustion unit 113a.

(About spiral fins)
By the way, in the conventional configuration of the surplus gas combustion device 113, when surplus biogas SG is burned in the surplus gas combustion unit 113a, the flame does not develop to the peripheral wall 113a1 of the flue in the surplus gas combustion unit 113a or the vicinity of the peripheral wall 113a1. In order for combustion to proceed in the vicinity of the center of the inner periphery, it is necessary to increase the distance of the combustion volume of the flame in the flow direction W (in this example, the height direction) of the surplus biogas SG in the surplus gas combustion section 113a.

  Then, the dimension L (length) in the flow direction W (height direction in this example) of the surplus biogas SG of the surplus gas combustion unit 113a in the surplus gas combustion apparatus 113 is increased, and thus the apparatus configuration is increased in size. .

  In this regard, in the surplus gas combustion device 113 according to the present embodiment, the surplus gas supply pipe 216 (specifically, the downstream gas supply pipe 216b) on the upstream side of the pilot burner 218 (specifically, the inner peripheral wall 216b1 in this example). ) Is provided with one or a plurality of spiral fins 301 for one or more rounds, and / or is further provided with one or a plurality of spiral fins 301 for less than one round (FIG. 2). And see FIGS. 3 and 4 to be described later). Specifically, the spiral fin 301 has a spiral shape centered on an axis along the flow direction W of the surplus biogas SG, and proceeds in the flow direction W while drawing a circle around the axis. Is formed. Here, the axis along the flow direction W of the surplus biogas SG can be, for example, the central axis of the surplus gas supply pipe 216.

  The spiral fin 301 provided inside the surplus gas supply pipe 216 swirls the surplus biogas SG discharged from the discharge port 216c of the surplus gas supply pipe 216 along the peripheral wall 113a1 of the flue in the surplus gas combustion section 113a. As long as it can be made, it may be any aspect, for example, the following aspects (a) to (g) can be exemplified.

FIG. 3 is an explanatory diagram for explaining various aspects of the spiral fin 301 provided inside the surplus gas supply pipe 216.
(A) A mode in which one spiral fin 301 having one or more rounds is provided (see FIG. 3A).
(B) A mode in which one spiral fin 301 of less than one round is provided (see FIG. 3B).
(C) A mode in which a plurality of spiral fins 301 of one or more rounds are provided (see FIG. 3C).
(D) A mode in which a plurality of spiral fins 301 of less than one round are provided (see FIG. 3D).
(E) A mode in which one spiral fin 301 is provided for one or more rounds (mode (a)) and a mode in which one spiral fin 301 is provided for less than one round (mode (b) ) In combination (not shown).
(F) A mode in which one spiral fin 301 having one or more rounds is provided (the mode (a)) and a mode in which a plurality of spiral fins 301 having less than one round are provided (the mode (d). ) In combination (not shown).
(G) A mode of providing one spiral fin 301 less than one turn (the mode of (b)) and a mode of providing a plurality of spiral fins 301 of one round or more (the mode of (c) above) ) In combination (not shown).

  In the case where a plurality of spiral fins 301 are provided as in the above-described aspect (g) to the above-described aspect (c), the pitches in the flow direction W of the surplus biogas SG are set to the spiral fins 301 to 301. (Period) may be provided (that is, the periods may coincide) (see FIGS. 3C and 3D) or may be provided so as to be shifted (see FIG. 4). May be combined.

  In the case where a plurality of spiral fins 301 are provided so that the pitch (period) in the flow direction W of the surplus biogas SG is shifted, the spiral fins 301 and 301 adjacent in the flow direction W of the surplus biogas SG are surplus. It may be provided so as to overlap when viewed from the flow direction W of the biogas SG (see FIG. 4), or may be provided so as not to overlap (see FIG. 3 (c) and FIG. 3 (d)). These may be combined.

  For example, in an embodiment in which three or more spiral fins 301 are provided, at least one set of adjacent ones of a plurality of adjacent spiral fins (301, 301) to (301, 301) in the flow direction W of the surplus biogas SG. The matching spiral fins may be provided so as to overlap when viewed from the flow direction W of the surplus biogas SG. When n (n is an integer of 2 or more) spiral fins 301 are provided so that the pitch (period) in the flow direction W of the surplus biogas SG is shifted, n (for example, 3) spirals 301 are provided. The fins 301 to 301 may be provided in a state where the period is shifted by an angle (360 degrees / n) (for example, 120 degrees) obtained by dividing 360 degrees by n (for example, 3) (see FIG. 4).

  The spiral fin 301 may have a pitch (period) in the flow direction W of the surplus biogas SG that is constant or substantially constant in the flow direction W (see FIGS. 3 and 4), but is not limited thereto. Instead, it may become smaller or larger as it proceeds in the flow direction W of the surplus biogas SG.

  The spiral fin 301 may be formed so that a space extending along the flow direction W of the surplus biogas SG is provided at the center in the circumferential direction (see FIGS. 3 and 4). It may be formed so as to block the center. When the spiral fin 301 is formed so that a space extending along the flow direction W of the surplus biogas SG is provided at the center in the circumferential direction, the inner diameter (the diameter of the space) is constant or substantially constant in the flow direction W. Although it may be constant, it is not limited to it, It may become small and may become large as it goes to the flow direction W of the surplus biogas SG.

  In the present embodiment, as shown in FIG. 2, the spiral fin 301 is located near the position of the discharge port 216 c of the surplus gas supply pipe 216 or the downstream side of the discharge port 216 c in the flow direction W of the surplus biogas SG. (A position a predetermined distance upstream from the discharge port 216c). Further, the spiral fin 301 is provided in a predetermined region in the flow direction W of the surplus biogas SG. Specifically, the spiral fin 301 is located at the position of the discharge port 216c of the surplus gas supply pipe 216 in the surplus biogas SG in the flow direction W or near the discharge port 216c (upstream a predetermined distance from the discharge port 216c). The gas swivel unit 300 is provided at a position on the side.

  FIG. 4 is a schematic configuration diagram illustrating the gas swirl unit 300 provided with the spiral fins 301 illustrated in FIG. 2. FIG. 4A is a perspective view of the gas swirling unit 300 viewed from almost directly above, and FIG. 4B is a perspective view of the gas swirling unit 300 viewed from obliquely above.

  As shown in FIG. 4, the gas swirl unit 300 has a cylindrical (in this example, cylindrical) gas swirl unit main body 302. The gas swirl unit main body 302 has a predetermined length in the longitudinal direction H. The gas swirl unit main body 302 constitutes a part of the surplus gas supply pipe 216 (specifically, the downstream gas supply pipe 216b).

  In the example shown in FIG. 4, a plurality of spiral fins 301 (three in this example) are provided on the inner peripheral wall 216 b 1 of the gas swirl unit main body 302.

  Specifically, the spiral fins 301 and 301 adjacent in the flow direction W of the surplus biogas SG are provided so as to overlap when viewed from the flow direction W of the surplus biogas SG (FIG. 4A). )reference). The n (three in this example) spiral fins 301-301 are provided with a period shifted by an angle (120 degrees in this example) obtained by dividing 360 degrees by n (3 in this example). Yes.

  In the spiral fin 301, the pitch (period) in the flow direction W of the surplus biogas SG is constant or substantially constant in the flow direction W.

  Further, the spiral fin 301 is formed so that a space SP extending along the flow direction W of the surplus biogas SG is provided at the center in the circumferential direction, and the inner diameter (the diameter of the space SP) is in the flow direction W. It is constant or substantially constant.

  According to the present embodiment, one or more rounds are provided on the inner side (in this example, the inner peripheral wall 216b1) of the surplus gas supply pipe 216 (specifically, the downstream gas supply pipe 216b) on the upstream side of the pilot burner 218. One or more spiral fins 301 are provided, and / or one or more spiral fins 301 of less than one turn are provided (see FIGS. 2, 3 and 4), so that excess gas The surplus biogas SG discharged from the discharge port 216c of the supply pipe 216 can be swung along the flue peripheral wall 113a1 in the surplus gas combustion section 113a, and therefore the flue reaches the peripheral wall 113a1 or near the peripheral wall 113a1. By developing F (see FIG. 2), the area of the flue inner peripheral surface (peripheral wall 113a1) where the flame F contacts or approaches can be increased. Accordingly, the size of the flue in the flow direction W of the surplus gas combustion portion 113a in the surplus gas combustion portion 113a can be suppressed while ensuring the necessary combustion volume of the flame F. Therefore, the surplus biogas SG in the surplus gas combustion portion 113a can be suppressed. The dimension L (see FIG. 2) (length) in the flow direction W (height direction in this example) can be made shorter than before, and as a result, it is possible to suppress an increase in the size of the apparatus configuration.

  The present invention is not limited to the embodiment described above, and can be implemented in various other forms. Therefore, such an embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Gas engine 101 Raw material supply apparatus 101a Input hopper 101b Raw material input part 101b1 Input conveyor 101b2 Input feeder 102 Gasification furnace 103 Cyclone 104 Gas cooler 105 Scrubber 106 Circulating water tank 107 Cooling tower 108 Gas filter 109 Induction blower 110 Pretreatment unit 111 Engine Power generation device 112 Water-sealed tank 113 Surplus gas combustion device 113a Surplus gas combustion section 113a1 Perimeter wall 113b Installation base 113c Smoke outlet 216 Excess gas supply pipe 216a Upstream gas supply pipe 216b Downstream gas supply pipe 216b1 Inner circumference wall 216c Discharge port 217 Burner Portion 217a Air hole 218 Pilot burner (an example of ignition means)
218a Gas cylinder 300 Gas swirl part 301 Spiral fin 302 Gas swirl part main body B Biomass CW Cooling water G Biogas F Flame H Longitudinal direction L Dimensions (length) of surplus gas combustion part
SG Surplus biogas (an example of surplus gas)
SP space W Flow direction of surplus biogas WW Washing water X Horizontal direction Y Vertical direction

Claims (1)

A surplus gas combustion device for combusting surplus gas of surplus fuel gas generated in a gasification furnace that generates fuel gas in an surplus gas combustion unit,
The surplus gas is discharged from a discharge port of a surplus gas supply pipe that supplies the surplus gas to the surplus gas combustion section and burned,
In the flow direction of the surplus gas, an ignition means for igniting the surplus gas discharged from the discharge port of the surplus gas supply pipe is provided downstream of the discharge port of the surplus gas supply pipe, and the ignition means One or more spiral fins of one or more rounds are provided inside the surplus gas supply pipe on the upstream side, or / and one or more spiral fins of less than one round are provided. The surplus gas combustion apparatus characterized by providing one piece.

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