JP2022165449A - Spray nozzle, gas combustor, boiler and power generating system - Google Patents

Abstract

To provide a spray nozzle which can easily burn ligneous gas in a spray nozzle used in a gas combustor for burning ligneous gas produced from wood chips.SOLUTION: In a spray nozzle 23, a cap member 28 comprises a first cylindrical part 28a arranged on the outer peripheral side of the small diameter cylindrical part 27b of a nozzle body 27, where a toric channel 28d into which compressed air having flowed out of the other end opening of the cannel 27h of the nozzle body 27 and an auxiliary gas flow, and a plurality of channels 28e leading from the channel 28d to the inner peripheral face of the first cylindrical part 28d are formed in the cap member 28. The channel 28d are formed so as to recess from a step face 28c formed at a boundary part between the first cylindrical part 28a and the second cylindrical part 28b on the inner peripheral side of the cap member 28 toward the first cylindrical part 28a side, and one end of the channel 28e is joined with the channel 28d, and the other end of the channel 28e is opened in the inner peripheral face of the first cylindrical part 28a.SELECTED DRAWING: Figure 3

Description

The present invention relates to an injection nozzle used in a gas combustor for burning wood gas produced from wood chips. The present invention also relates to a gas combustor provided with this injection nozzle, a boiler provided with this gas combustor, and a power generation system provided with this boiler.

Conventionally, a fluid nozzle that mixes a plurality of fluids and sprays them onto an object is known (see, for example, Patent Document 1). The fluid nozzle described in Patent Literature 1 includes a body portion having a nozzle portion in which a flow path through which a first fluid flows is formed at the center and whose tip is open, and a cylindrical cap that covers the nozzle portion. A swirling groove for passing the second fluid is formed on the inner peripheral side of the cap. Further, the cap is formed with a through-hole for passing the second fluid that has passed through the turning groove.

JP 2020-78771 A

The inventor of the present application is studying the structure of an injection nozzle (fluid nozzle) used in a gas combustor for burning wood gas generated from wood chips. This injection nozzle injects woody gas. In general, wood gas is difficult to burn because it contains a relatively large amount of moisture. That is, it is not easy to burn woody gas in a gas burner.

Accordingly, an object of the present invention is to provide an injection nozzle for use in a gas combustor for burning wood gas generated from wood chips, which can easily burn wood gas. It is in. Another object of the present invention is to provide a gas combustor including this injection nozzle, a boiler including this gas combustor, and a power generation system including this boiler.

In order to solve the above problems, the injection nozzle of the present invention is an injection nozzle used in a gas combustor for burning wood gas generated from wood chips, the main body side first flow through which the wood gas flows. It comprises a cylindrical nozzle body in which a channel is formed in the center, and a cylindrical cap member fixed to the tip side of the nozzle body, and the nozzle body is a cylindrical small-diameter cylindrical portion that constitutes the tip of the nozzle body. and a cylindrical large-diameter cylinder portion connected to the small-diameter cylinder portion and having an outer diameter larger than that of the small-diameter cylinder portion, and the nozzle body includes a main-body-side second flow passage through which compressed air flows, and an auxiliary fuel gas flows through the nozzle main body. one end of the main body-side second flow channel and one end of the main body-side third flow channel are opened on the outer peripheral surface of the large-diameter cylindrical portion, and the other end of the main body-side second flow channel and the other end of the main-body-side third flow path opens at a stepped surface formed at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion on the outer peripheral side of the nozzle body, and the cap member is located on the outer peripheral side of the small-diameter cylindrical portion. and a cylindrical second cylindrical portion connected to the first cylindrical portion and fixed to the large-diameter cylindrical portion, wherein the inner diameter of the first cylindrical portion is equal to that of the second cylindrical portion The compressed air and auxiliary fuel gas flowing out from the opening at the other end of the second body-side flow path and the opening at the other end of the third body-side flow path flow into the cap member. An annular cap-side first flow channel and a plurality of cap-side second flow channels communicating from the cap-side first flow channel to the inner peripheral surface of the first cylindrical portion are formed, and the cap-side first flow channel is formed in the cap member. The axis of the cap member formed in a cylindrical shape and formed so as to be recessed toward the first cylindrical portion from a stepped surface formed at the boundary portion between the first cylindrical portion and the second cylindrical portion on the inner peripheral side of the The shape of the first cap-side flow path when viewed from the direction is annular, and one end of the second cap-side flow path is connected to the first cap-side flow path, and the other end of the second cap-side flow path is connected to the second cap-side flow path. The end is open on the inner peripheral surface of the first cylindrical portion, and one end of the cap-side second flow channel and the other end of the cap-side second flow channel are displaced in the circumferential direction of the first cylindrical portion, and have a small diameter. Wood gas is injected from an opening at the tip of the cylindrical portion, and compressed air and auxiliary fuel gas are injected from between the outer peripheral surface of the small-diameter cylindrical portion and the inner peripheral surface of the first cylindrical portion on the tip side of the small-diameter cylindrical portion and the first cylindrical portion. and a mixed gas is jetted.

In the injection nozzle of the present invention, the cap member includes the first cylindrical portion arranged on the outer peripheral side of the small-diameter cylindrical portion of the nozzle body, and the cap member includes the body-side second flow path formed in the nozzle body. An annular cap-side first flow path into which the compressed air and the auxiliary fuel gas flowed out from the opening at the other end and the opening at the other end of the main body-side third flow path flow in; A plurality of cap-side second flow paths communicating with the inner peripheral surface of the portion are formed. Further, in the present invention, the cap-side first flow path is recessed toward the first cylindrical portion from the step surface formed at the boundary portion between the first cylindrical portion and the second cylindrical portion on the inner peripheral side of the cap member. One end of the second cap-side flow path is connected to the first cap-side flow path, and the other end of the second cap-side flow path is open on the inner peripheral surface of the first tubular portion.

Therefore, in the present invention, the compressed air and the auxiliary fuel gas that have passed through the cap-side second flow path flow out toward the inner peripheral side of the first cylindrical portion. Therefore, in the present invention, the compressed air and the auxiliary fuel gas that have passed through the cap-side second flow path collide with the outer peripheral surface of the small-diameter cylindrical portion of the nozzle body, and the outer peripheral surface of the small-diameter cylindrical portion and the inner circumference of the first cylindrical portion It is possible to efficiently generate turbulence between the surfaces. As a result, in the present invention, the wood gas injected from the opening at the tip of the small-diameter tubular portion, the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion on the tip side of the small-diameter tubular portion and the first tubular portion. It becomes possible to mix efficiently with the mixed gas injected from between. Therefore, according to the studies of the inventors of the present application, the gas combustor using the injection nozzle of the present invention can easily burn the woody gas.

In the present invention, the other end of the main body-side second flow path and the other end of the main body-side third flow path also directly communicate between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion. , the compressed air and the auxiliary fuel gas flowing out from the opening at the other end of the main-body-side second flow path and the opening at the other end of the main-body-side third flow path flow through the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion. It is preferable to flow directly between With this configuration, the compressed air and the auxiliary fuel gas flowing toward the inner peripheral side of the first tubular portion between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion, the small-diameter tubular portion and Compressed air and auxiliary fuel gas flowing directly between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion toward the distal end side of the first tubular portion cause the outer peripheral surface of the small-diameter tubular portion and the first tubular portion to move. It becomes possible to generate more complicated turbulent flow with the inner peripheral surface of the cylindrical portion. Therefore, the woody gas injected from the opening at the tip of the small-diameter tubular portion and the small-diameter tubular portion and the first tubular portion are injected from between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion on the tip side of the small-diameter tubular portion. It becomes possible to mix with the mixed gas more efficiently.

In the present invention, two body-side second flow paths and two body-side third flow paths are formed in the nozzle body, and the body-side second flow paths and the body-side third flow paths are It is preferable that they are alternately arranged at a pitch of 90° with respect to the axis of the large-diameter cylindrical portion formed in a cylindrical shape. With this configuration, it is possible to suppress unevenness in the circumferential direction of the small-diameter tubular portion of the turbulent flow generated between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion. Therefore, the woody gas injected from the opening at the tip of the small-diameter tubular portion and the small-diameter tubular portion and the first tubular portion are injected from between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion on the tip side of the small-diameter tubular portion. It becomes possible to mix with the mixed gas more efficiently.

In the present invention, the auxiliary fuel gas flowing through one of the main body-side third flow passages of the two main body-side third flow passages is hydrogen gas, and the auxiliary fuel gas flowing through the other main body-side third flow passage is , propane gas. According to studies by the inventors of the present application, such a configuration makes it possible to burn woody gas more easily in a gas combustor using the injection nozzle of the present invention.

The injection nozzle of the present invention can be used in gas combustors. This gas combustor comprises a bottomed metal outer cylinder having a cylindrical outer cylinder portion and an outer bottom portion that closes one end of the outer cylinder portion; A metal inner cylinder arranged inside the outer cylinder formed in a bottomed cylinder shape having an inner bottom closing one end of the part, and a ceramic member arranged inside the inner cylinder, The inner cylinder is inserted inside the outer cylinder so that the inner bottom part is arranged on the outer bottom side, and between the outer cylinder part and the inner cylinder part and between the outer bottom part and the inner bottom part, A gap is formed, and a large number of through holes are formed in the outer cylinder part, the outer bottom part, the inner cylinder part and the inner bottom part, and the injection nozzle injects the wood gas mixed with the mixed gas toward the inside of the inner cylinder. Preferably, the flame is generated at least outside the outer cylinder and outside the outer bottom.

With this gas burner, woody gas can be easily burned. Further, this gas combustor includes an outer cylinder, an inner cylinder arranged inside the outer cylinder, and a ceramic member made of ceramic arranged inside the inner cylinder. and between the outer bottom and the inner bottom. In addition, a large number of through holes are formed in the outer tubular portion, the outer bottom portion, the inner tubular portion, and the inner bottom portion, and flames are generated at least outside the outer tubular portion and outside the outer bottom portion. Therefore, according to the studies of the inventors of the present application, it is possible to burn the woody gas more easily in this gas combustor.

According to the study of the inventor of the present application, in this gas combustor, the moisture content of the woody gas can be reduced inside the inner cylinder by the action of the ceramic member arranged inside the inner cylinder. Since the temperature drop inside the inner cylinder can be suppressed by the action of the ceramic member, the woody gas blown out from the through-holes of the inner cylinder (that is, the through-holes of the inner cylinder and the through-holes of the inner bottom) is retained in the gap between the inner cylinder and the outer cylinder, it is possible to suppress the temperature drop in the gap between the inner cylinder and the outer cylinder. By this action, the wood gas remaining in the gap between the inner cylinder and the outer cylinder is turbulent, and the wood gas remaining in the gap between the inner cylinder and the outer cylinder is agitated and stirred. Since the homogenized woody gas can be ejected from the through-holes of the outer cylinder (that is, the through-holes of the outer cylinder part and the through-holes of the outer bottom part) and burned outside the outer cylinder part and outside the outer bottom part, It is presumed that wood gas can be burned more easily.

In the present invention, the ceramic member is preferably fixed to the inner bottom. With this configuration, it becomes possible to easily position and fix the ceramic member arranged inside the inner cylinder.

Gas combustors with injection nozzles of the invention can be used, for example, in boilers. This boiler produces steam from the heat generated in the gas combustor. Also, this boiler can be used in a power generation system comprising a gasification furnace that generates wood gas supplied to the injection nozzle from wood chips, and a generator having a steam turbine that is rotated by the steam generated by the boiler. can. This boiler and power generation system allows wood gas to be burned more easily in the gas combustor.

As described above, the gas combustor using the injection nozzle of the present invention can easily burn woody gas.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating the structure of the electric power generation system concerning embodiment of this invention. FIG. 2 is a schematic diagram for explaining the configuration of the gas combustor shown in FIG. 1; FIG. 3 is a cross-sectional view of the injection nozzle shown in FIG. 2; (A) is a side view of the nozzle body shown in FIG. 3, and (B) is a cross-sectional view of the EE cross section of (A). (A) is a side view of the cap member shown in FIG. 3, and (B) is a cross-sectional view of the FF cross section of (A). FIG. 5B is a cross-sectional view of the GG cross section of FIG. 5B;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of power generation system, gasification furnace and gas combustor)
FIG. 1 is a schematic diagram for explaining the configuration of a power generation system 1 according to an embodiment of the invention. FIG. 2 is a schematic diagram for explaining the configuration of the gas combustor 5 shown in FIG.

A power generation system 1 of this embodiment includes a gasification furnace 2 , a boiler 3 , and a generator 4 . The gasification furnace 2 carbonizes the wood chips to generate wood gas from the wood chips. The wood chips of this embodiment are wood chips made of wood pulverized into chips. The size of the wood chip is about several millimeters. The boiler 3 is supplied with woody gas produced in the gasification furnace 2 . Specifically, the woody gas generated in the gasification furnace 2 is directly supplied to the boiler 3 . The boiler 3 burns woody gas to generate steam. The boiler 3 includes a gas combustor 5 and the like for burning wood gas. Steam generated in the boiler 3 is supplied to the generator 4 . The power generator 4 includes a steam turbine 6 and the like that are rotated by steam generated by the boiler 3 .

The gasification furnace 2 includes a gasification furnace body 12 inside which a primary combustion chamber 10 and a secondary combustion chamber 11 are formed, and a partition member 13 arranged inside the gasification furnace body 12 . The partition member 13 partitions the interior of the gasification furnace body 12 in the vertical direction. In the gasifier main body 12, the upper side of the partition member 13 inside the gasifier main body 12 is the primary combustion chamber 10, and the lower side of the partition member 13 inside the gasifier main body 12 is the secondary combustion chamber. Room 11. Wood chips are supplied to the primary combustion chamber 10 from above. In the primary combustion chamber 10, the wood chips are heated, for example, at about 300 to 600° C. to produce a carbonized material of the carbonized wood chips and a primary product gas.

The partition member 13 is, for example, punched metal, and has a plurality of passage holes through which the carbide produced in the primary combustion chamber 10 passes toward the secondary combustion chamber 11 . Charcoal produced in the primary combustion chamber 10 passes through the passage hole of the partition member 13 by its own weight and falls into the secondary combustion chamber 11 . In the secondary combustion chamber 11, the carbide produced in the primary combustion chamber 10 is heated, for example, to about 1000-1200.degree. A primary product gas produced in the primary combustion chamber 10 is supplied to the secondary combustion chamber 11 . In the secondary combustion chamber 11, woody gas is produced using the carbide and the primary produced gas. Compressed air may be supplied to the secondary combustion chamber 11 .

The gasification furnace 2 also includes a chip storage section 14 that stores wood chips to be supplied to the gasification furnace main body 12, a take-out pipe 15 for taking out the wood gas generated in the secondary combustion chamber 11, A supply pipe 16 for supplying the primary product gas produced in the primary combustion chamber 10 to the secondary combustion chamber 11 is provided. The chip accommodating portion 14 is arranged above the gasification furnace main body 12 . Wood chips are supplied to the chip storage portion 14 from above. Specifically, wood chips pulverized by a pulverizer are supplied to the chip storage section 14 from above by a conveyor or the like. The wood chips stored in the chip storage portion 14 are sequentially supplied to the gasification furnace main body 12 by their own weight.

The extraction pipe 15 is arranged between the secondary combustion chamber 11 and the gas combustor 5 . One end of the extraction pipe 15 is connected to the upper surface side of the secondary combustion chamber 11 . The extraction pipe 15 is routed upward from the secondary combustion chamber 11 , and part of the extraction pipe 15 is arranged inside the primary combustion chamber 10 and inside the chip storage section 14 . . The woody gas extracted from the secondary combustion chamber 11 passes through a part of the extraction pipe 15 arranged inside the primary combustion chamber 10 and inside the chip storage section 14 . A blower is arranged in the middle of the extraction pipe 15 to send the woody gas generated in the secondary combustion chamber 11 to the gas burner 5 .

The supply pipe 16 is arranged between the primary combustion chamber 10 and the secondary combustion chamber 11 . An air blower 17 that sends the primary gas generated in the primary combustion chamber 10 to the secondary combustion chamber 11 is arranged in the middle of the supply pipe 16 . One end of the supply pipe 16 is connected to the secondary combustion chamber 11 from the outer peripheral side of the secondary combustion chamber 11 so that the primary generated gas is supplied in the tangential direction of the inner wall of the secondary combustion chamber 11 . Therefore, in the secondary combustion chamber 11, the carbide and the primary produced gas swirl. That is, in the secondary combustion chamber 11, the carbide and the primary produced gas are swirled and burned.

As mentioned above, the boiler 3 is equipped with a gas combustor 5 . The gas combustor 5 is installed in the combustion chamber of the boiler 3 , and the boiler 3 uses the heat generated by the gas combustor 5 to generate steam. The gas combustor 5 includes a metal outer cylinder 20 formed in a cylindrical shape with a bottom, a metal inner cylinder 21 formed in a cylindrical shape with a bottom and disposed inside the outer cylinder 20, and an inner cylinder A ceramic member 22 made of ceramic arranged inside the cylinder 21 and an injection nozzle for injecting wood gas supplied from the gasification furnace 2 (that is, wood gas generated from wood chips) toward the inside of the inner cylinder 21. 23. The outer cylinder 20 and the injection nozzle 23 are fixed to a frame (not shown) of the gas combustor 5 . The gas burner 5 also has an ignition mechanism (not shown) for igniting the woody gas.

Outer cylinder 20 is made of, for example, stainless steel. The outer cylinder 20 includes a tubular outer tubular portion 20a and an outer bottom portion 20b that closes one end of the outer tubular portion 20a. The outer cylinder 20 of this embodiment is formed in a cylindrical shape with a bottom. That is, the outer tubular portion 20a is formed in a cylindrical shape, and the outer bottom portion 20b is formed in a disk shape. A large number of through holes 20c are formed in the outer tubular portion 20a and the outer bottom portion 20b. That is, the outer cylinder 20 is formed with a large number of through holes 20c. Through hole 20c is, for example, a round hole.

Inner cylinder 21 is made of, for example, stainless steel. The inner cylinder 21 includes a tubular inner tubular portion 21a and an inner bottom portion 21b that closes one end of the inner tubular portion 21a. The inner cylinder 21 of this embodiment is formed in a bottomed cylindrical shape, the inner cylindrical portion 21a is formed in a cylindrical shape, and the inner bottom portion 21b is formed in a disk shape. The outer diameter of the inner tubular portion 21a is smaller than the inner diameter of the outer tubular portion 20a. A large number of through holes 21c are formed in the inner tubular portion 21a and the inner bottom portion 21b. That is, the inner cylinder 21 is formed with a large number of through holes 21c. Through hole 21c is, for example, a round hole. The inner cylinder 21 is fixed to the frame (not shown) of the gas combustor 5 via the outer cylinder 20 .

The inner cylinder 21 is inserted inside the outer cylinder 20 so that the inner bottom portion 21b is arranged on the outer bottom portion 20b side. That is, the opening of the inner cylinder 21 is arranged on the opening side of the outer cylinder 20 . In this embodiment, the entire inner cylinder 21 is arranged inside the outer cylinder 20 . A gap is formed between the outer tubular portion 20a and the inner tubular portion 21a. That is, a gap is formed between the inner peripheral surface of the outer tubular portion 20a and the outer peripheral surface of the inner tubular portion 21a. A gap is also formed between the outer bottom portion 20b and the inner bottom portion 21b. The ceramic member 22 is formed in a disc shape. A gap of a predetermined size is formed in the ceramic member 22 . The ceramic member 22 is fixed to the inner bottom portion 21b. The ceramic member 22 is arranged at a position where the woody gas injected from the injection nozzle 23 collides.

The injection nozzle 23 is arranged on the opening side of the outer cylinder 20 and the inner cylinder 21 . Also, the injection nozzle 23 is arranged outside the outer cylinder 20 and the inner cylinder 21 . The injection nozzle 23 is connected to the extraction pipe 15 and supplied with the woody gas produced in the gasification furnace 2 . The injection nozzle 23 injects woody gas toward the inner side of the inner cylinder 21 as described above. A specific configuration of the injection nozzle 23 will be described later.

The woody gas injected from the injection nozzle 23 collides with the ceramic member 22 arranged inside the inner cylinder 21, and then is ejected from the through hole 21c of the inner cylinder 21 into the gap between the inner cylinder 21 and the outer cylinder 20. . The woody gas spouted into the gap between the inner cylinder 21 and the outer cylinder 20 is then spouted out of the outer cylinder 20 from the through hole 20c of the outer cylinder 20 . The wood gas burns at least outside the outer tubular portion 20a and outside the outer bottom portion 20b. That is, in the gas combustor 5, the flame B is generated at least outside the outer tubular portion 20a and outside the outer bottom portion 20b. Note that the flame B may also be generated inside the outer cylinder 20 .

(Structure of injection nozzle)
FIG. 3 is a cross-sectional view of the injection nozzle 23 shown in FIG. 4(A) is a side view of the nozzle body 27 shown in FIG. 3, and FIG. 4(B) is a cross-sectional view of the EE cross section of FIG. 4(A). 5(A) is a side view of the cap member 28 shown in FIG. 3, and FIG. 5(B) is a sectional view taken along the line FF of FIG. 5(A). FIG. 6 is a cross-sectional view taken along line GG in FIG. 5(B).

As mentioned above, the gas combustor 5 is equipped with injection nozzles 23 . That is, the injection nozzle 23 is used with the gas combustor 5 . The injection nozzle 23 is a multi-fluid nozzle. Compressed air and auxiliary fuel gas are supplied to the injection nozzle 23 in addition to the woody gas. In this embodiment, hydrogen gas and propane gas are supplied to the injection nozzle 23 as auxiliary fuel gas. The injection nozzle 23 injects woody gas mixed with a mixed gas of auxiliary fuel gas and compressed air toward the inside of the inner cylinder 21 . That is, the injection nozzle 23 injects a gas containing a mixture of hydrogen gas, propane gas, and compressed air into the woody gas, which is the main component, toward the inside of the inner cylinder 21 .

The injection nozzle 23 includes a cylindrical nozzle body 27 in which a flow path 27a through which woody gas flows is formed at the center, a cylindrical cap member 28 fixed to the tip side of the nozzle body 27, and a cylindrical cap member 28 fixed to the nozzle body 27. and a ring-shaped fixing member 29 . The axial center of the tubular nozzle body 27, the axial center of the tubular cap member 28, and the axial center of the annular fixing member 29 are aligned.

In the following description, the axial direction of the injection nozzle 23 is defined as the lateral direction. In addition, the X1 direction side in FIG. 3 etc., which is one side in the horizontal direction, is the "left" side, and the opposite side, the X2 direction side in FIG. 3 etc., is the "right" side. The left-right direction is the axial direction of the tubular nozzle body 27 and the axial direction of the tubular cap member 28 . In this embodiment, the left end of the injection nozzle 23 is the tip of the injection nozzle 23 . Also, the left end of the nozzle body 27 is the tip of the nozzle body 27 and the left end of the cap member 28 is the tip of the cap member 28 .

Further, in the following description, the radial direction of the injection nozzle 23 is defined as "radial direction", and the circumferential direction of the injection nozzle 23 is defined as "circumferential direction". The radial direction of the injection nozzle 23 is also the radial direction of the nozzle body 27 and the cap member 28 . In the radial direction of the injection nozzle 23, a small-diameter cylindrical portion 27b and a large-diameter cylindrical portion 27c, which constitute a part of the nozzle main body 27, and a first cylindrical portion 28a, which constitutes a part of the cap member 28, are described below. , is also the radial direction of the second tubular portion 28b. The circumferential direction of the injection nozzle 23 is the circumferential direction of the nozzle main body 27 and the cap member 28, and the circumferential direction of the small-diameter cylindrical portion 27b, the large-diameter cylindrical portion 27c, the first cylindrical portion 28a, and the second cylindrical portion 28b. be.

The nozzle main body 27 includes a cylindrical small-diameter cylindrical portion 27b forming a tip (left end) of the nozzle main body 27, a cylindrical large-diameter cylindrical portion 27c having an outer diameter larger than that of the small-diameter cylindrical portion 27b, and a gas combustor. 5 and a fixed portion 27d in the shape of a square tube fixed to a frame (not shown). The large-diameter tubular portion 27c is connected to the right end of the small-diameter tubular portion 27b. The fixed portion 27d is connected to the right end of the large-diameter cylindrical portion 27c. The nozzle body 27 of this embodiment is composed of a small-diameter cylindrical portion 27b, a large-diameter cylindrical portion 27c, and a fixed portion 27d. The axial center of the small-diameter cylindrical portion 27b, the axial center of the large-diameter cylindrical portion 27c, and the axial center of the fixed portion 27d are aligned.

A channel 27a is formed on the inner peripheral sides of the small-diameter cylindrical portion 27b, the large-diameter cylindrical portion 27c, and the fixed portion 27d. The flow path 27a penetrates the nozzle body 27 in the left-right direction. One end of the flow path 27a opens at the left end (tip) of the small-diameter cylindrical portion 27b, and the other end of the flow path 27a opens at the right end of the fixed portion 27d. Woody gas generated in the gasification furnace 2 flows into the flow path 27a from the right side. That is, the wood gas flows into the injection nozzle 23 from the opening at the right end of the fixed portion 27d. The opening at the left end of the small-diameter cylindrical portion 27b serves as an injection port for injecting woody gas. That is, the injection nozzle 23 injects the woody gas from the opening at the tip of the small-diameter cylindrical portion 27b. The channel 27a of this embodiment is the main body side first channel.

The outer diameter of the small-diameter cylindrical portion 27b is constant. On the other hand, the large-diameter tubular portion 27c is formed in a stepped cylindrical shape, and the outer diameter of the large-diameter tubular portion 27c is not constant. The large-diameter tubular portion 27c includes a first large-diameter tubular portion 27e forming a left end portion of the large-diameter tubular portion 27c and a second large-diameter tubular portion 27e having an outer diameter larger than that of the first large-diameter tubular portion 27e. It is composed of a tubular portion 27f and a cylindrical third large-diameter tubular portion 27g having an outer diameter larger than that of the second large-diameter tubular portion 27f. The first large-diameter tubular portion 27e is connected to the right end of the small-diameter tubular portion 27b. The second large-diameter tubular portion 27f is connected to the right end of the first large-diameter tubular portion 27e, and the third large-diameter tubular portion 27g is connected to the right end of the second large-diameter tubular portion 27f.

A male thread is formed on the outer peripheral surface of the first large-diameter cylindrical portion 27e with which a female thread formed on the inner peripheral surface of the cap member 28 engages. A male thread is formed on the outer peripheral surface of the second large-diameter cylindrical portion 27f with which a female thread formed on the inner peripheral surface of the fixing member 29 engages. The inner diameter of the large-diameter cylindrical portion 27c is constant. Further, the inner diameter of the small-diameter cylindrical portion 27b is constant. The inner diameter of the large-diameter tubular portion 27c is equal to the inner diameter of the small-diameter tubular portion 27b.

The nozzle body 27 is formed with two flow paths 27h through which compressed air flows, one flow path 27j through which hydrogen gas flows, and one flow path 27j through which propane gas flows. That is, the nozzle body 27 is formed with two flow paths 27h through which the compressed air flows and two flow paths 27j through which the auxiliary fuel gas flows. 27 h of flow paths of this form are main body side 2nd flow paths. Further, the flow path 27j of this embodiment is the main body side third flow path, and the auxiliary fuel gas flowing through one of the main body side third flow paths of the two main body side third flow paths becomes hydrogen gas. The auxiliary fuel gas flowing through the other body-side third flow path is propane gas.

The flow paths 27h and 27j are formed outside the flow path 27a in the radial direction. One ends of the flow paths 27h and 27j are open on the outer peripheral surface of the large-diameter cylindrical portion 27c. Specifically, one ends of the flow paths 27h and 27j are opened at the outer peripheral surface of the third large-diameter cylindrical portion 27g. The other ends of the flow paths 27h and 27j are located on the outer peripheral side of the nozzle body 27 at the boundaries between the small-diameter tubular portion 27b and the large-diameter tubular portion 27c (more specifically, the small-diameter tubular portion 27b and the first large-diameter tubular portion 27e). The stepped surface 27k formed in the boundary portion between the . The flow channels 27h and the flow channels 27j are alternately arranged at a pitch of 90° with respect to the axial center of the cylindrical large-diameter portion 27c.

The flow paths 27h and 27j are composed of a straight radial flow path 27p extending radially inward from the outer peripheral surface of the third large-diameter tubular portion 27g, and a straight radial flow path 27p extending leftward from the radially inner end of the radial flow path 27p. It is composed of a linear axial flow path 27r extending toward the flow path. That is, one end of the flow paths 27h and 27j and the other end of the flow paths 27h and 27j are arranged at the same position in the circumferential direction, and the cross-sectional shapes of the flow paths 27h and 27j are shown in FIG. As shown, it has an L shape. The radial channel 27p and the axial channel 27r are round holes. In this embodiment, the inner diameter of the radial flow passage 27p is larger than the inner diameter of the axial flow passage 27r.

A compressed air supply device (not shown) is connected via a pipe to an opening at one end of the flow path 27h formed on the outer peripheral surface of the third large-diameter cylindrical portion 27g. The compressed air supplied to the flow path 27h flows out from an opening at the other end of the flow path 27h formed in the step surface 27k. A hydrogen gas supply device (not shown) is connected via a pipe to an opening at one end of one flow path 27j formed on the outer peripheral surface of the third large-diameter tubular portion 27g. A propane gas supply device (not shown) is connected via a pipe to an opening at one end of the other flow path 27j formed on the outer peripheral surface of the . The hydrogen gas or propane gas supplied to the flow path 27j flows out from an opening at the other end of the flow path 27j formed in the step surface 27k.

The cap member 28 includes a cylindrical first cylindrical portion 28a arranged on the outer peripheral side of the small-diameter cylindrical portion 27b of the nozzle body 27, and a cylindrical second cylindrical portion 28b fixed to the large-diameter cylindrical portion 27c. ing. The first tubular portion 28 a constitutes the left end (tip) of the cap member 28 . The second tubular portion 28b is connected to the right end of the first tubular portion 28a. The cap member 28 of this embodiment is composed of a first tubular portion 28a and a second tubular portion 28b. The axis of the first cylindrical portion 28a and the axis of the second cylindrical portion 28b are aligned. The inner diameter of the first tubular portion 28a is smaller than the inner diameter of the second tubular portion 28b.

The outer diameter and inner diameter of the second cylindrical portion 28b are constant. A female thread that engages with a male thread formed on the outer peripheral surface of the first large-diameter tubular portion 27e is formed on the inner peripheral surface of the second tubular portion 28b. The cap member 28 is fixed to the nozzle body 27 by engaging the female thread on the inner peripheral surface of the second cylindrical portion 28b and the male thread on the outer peripheral surface of the first large-diameter cylindrical portion 27e. A stepped surface 28c formed at the boundary between the first cylindrical portion 28a and the second cylindrical portion 28b on the inner peripheral side of the cap member 28 contacts the stepped surface 27k of the nozzle body 27 with a predetermined contact pressure.

The cap member 28 has an annular channel 28d into which the compressed air and the auxiliary fuel gas (that is, the compressed air, the hydrogen gas and the propane gas) flowing out from the openings at the other ends of the channels 27h and 27j of the nozzle body 27 flow. , a plurality of flow paths 28e are formed that extend from the flow path 28d to the inner peripheral surface of the first tubular portion 28a. In this embodiment, the cap member 28 is formed with eight flow paths 28e. 28 d of flow paths of this form are a cap side 1st flow paths, and the flow path 28e is a cap side 2nd flow path.

28 d of flow paths are formed so that it may become depressed toward the left from the level|step difference surface 28c. That is, the flow path 28d is formed so as to be recessed from the stepped surface 28c toward the first cylindrical portion 28a. 28 d of flow paths are formed from the right end of the 1st cylinder part 28a to the intermediate position of the left-right direction of the 1st cylinder part 28a. The shape of the flow path 28d when viewed from the left-right direction (that is, the shape of the flow path 28d when viewed from the axial direction of the cylindrically formed cap member 28) is annular. The center of curvature of the flow path 28 d when viewed from the left-right direction coincides with the axial center of the cap member 28 .

The radially outer surface of the flow path 28d is arranged radially inward of the radially outer end of the axial flow path 27r, and the radially inner surface of the flow path 28d is arranged radially inside the axial flow path. It is arranged radially outward of the inner end of 27r. A portion of the first cylindrical portion 28a that is arranged radially inside the flow path 28d is a cylindrical inner first cylindrical portion 28f. The right end surface of the inner first tubular portion 28f is arranged on the left side of the stepped surface 28c.

The outer peripheral surface of the first tubular portion 28a is an inclined surface that is inclined radially inward toward the left side (that is, toward the tip side of the cap member 28). The left end portion of the inner peripheral surface of the first cylindrical portion 28a forms an inclined surface 28g that inclines outward in the radial direction toward the left side. The inner diameter of the portion of the first cylinder portion 28a excluding the inclined surface 28g is constant. The inner diameter of the first cylindrical portion 28a is larger than the outer diameter of the small-diameter cylindrical portion 27b. A gap is formed in the entire circumferential direction between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. The inner peripheral surface of the first cylindrical portion 28a is arranged slightly radially outside the inner end of the axial flow path 27r in the radial direction. The left end surface of the first cylindrical portion 28a is arranged at the same position in the left-right direction as the left end surface of the small-diameter cylindrical portion 27b, or is arranged slightly to the left of the left end surface of the small-diameter cylindrical portion 27b.

The channel 28e is a round hole. One end of the channel 28e is connected to the channel 28d. The other end of the flow path 28e is open on the inner peripheral surface of the first tubular portion 28a. Specifically, the other end of the flow path 28e is open on the inner peripheral surface of the inner first tubular portion 28f. One end of the flow path 28e and the other end of the flow path 28e are arranged at the same position in the horizontal direction. Also, one end of the flow path 28e and the other end of the flow path 28e are displaced in the circumferential direction. The flow path 28e of this embodiment is formed in a spiral shape, and the shape of the flow path 28e when viewed in the left-right direction is curved. The eight flow paths 28e are arranged at a constant pitch in the circumferential direction. That is, the eight flow paths 28e are arranged at a pitch of 45° with respect to the axial center of the first tubular portion 28a.

In the injection nozzle 23, the compressed air, hydrogen gas, and propane gas that flow out from the openings at the other ends of the flow paths 27h and 27j of the nozzle body 27 pass through the flow path 28d and then the flow path 28e to the small-diameter cylinder. It flows into between the outer peripheral surface of the portion 27b and the inner peripheral surface of the first cylindrical portion 28a. In this embodiment, the compressed air, hydrogen gas, and propane gas flowing out from the openings at the other ends of the flow paths 27h and 27j flow into the annular flow path 28d. can be mixed.

In addition, as described above, the right end surface of the inner first tubular portion 28f is arranged on the left side of the stepped surface 28c, and there is a gap between the right end surface of the inner first tubular portion 28f and the stepped surface 27k. Therefore, the other ends of the flow paths 27h and 27j also directly communicate between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. Therefore, the compressed air, hydrogen gas, and propane gas that flow out from the openings at the other ends of the flow paths 27h and 27j directly flow between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. do.

Compressed air, hydrogen gas, and propane gas that flowed between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a spread between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. and is injected from between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a on the left end side of the small-diameter tubular portion 27b and the first tubular portion 28a. That is, in the injection nozzle 23, compressed air, hydrogen gas, and propane gas are injected from between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a on the tip side of the small-diameter tubular portion 27b and the first tubular portion 28a. is injected, and an injection port for injecting the mixed gas is provided between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a at the tip of the injection nozzle 23. is formed.

As described above, one end of the flow path 28e and the other end of the flow path 28e are displaced in the circumferential direction. The mixed gas jetted from between the surfaces swirls in a generally spiral shape. The mixed gas injected from between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a at the tip of the injection nozzle 23 passes through the opening at the tip of the small-diameter cylindrical portion 27b at the tip of the injection nozzle 23. mixed with woody gas emitted from The gas injected from the injection nozzle 23 (that is, the woody gas mixed with the mixed gas) is finely atomized by the action of the compressed air. Further, the gas injected from the injection nozzle 23 is swirling in a generally spiral shape. That is, the flow of gas injected from the injection nozzle 23 is a swirling flow.

(Main effects of this form)
As described above, in the injection nozzle 23 of this embodiment, the cap member 28 includes the first cylindrical portion 28a arranged on the outer peripheral side of the small-diameter cylindrical portion 27b of the nozzle body 27. The cap member 28 includes: An annular channel 28d into which the compressed air, hydrogen gas and propane gas flowed out from the openings at the other ends of the channels 27h and 27j formed in the nozzle body 27, and the inside of the first cylindrical portion 28a from the channel 28d. Eight flow paths 28e are formed to communicate with the peripheral surface. Moreover, in this embodiment, one end of the flow path 28e is connected to the flow path 28d, and the other end of the flow path 28e is open on the inner peripheral surface of the first cylindrical portion 28a.

Therefore, in this embodiment, the compressed air, hydrogen gas, and propane gas that have passed through the flow path 28e flow out toward the inner peripheral side of the first tubular portion 28a. Therefore, in this embodiment, the compressed air, hydrogen gas, and propane gas that have passed through the flow path 28e collide with the outer peripheral surface of the small-diameter cylindrical portion 27b, and the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a It is possible to efficiently generate turbulence between As a result, in this embodiment, the wood gas injected from the opening at the tip of the small-diameter tubular portion 27b and the tip of the injection nozzle 23, between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. It becomes possible to mix efficiently with the mixed gas injected from. Therefore, according to the studies of the inventors of the present application, the gas combustor 5 using the injection nozzle 23 of this embodiment can easily burn the woody gas.

In this embodiment, the other ends of the flow paths 27h and 27j also directly communicate between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a. Compressed air, hydrogen gas, and propane gas that flow out from the openings also directly flow between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a. Therefore, in this embodiment, compressed air, hydrogen gas, and propane gas flow toward the inner peripheral side of the first cylindrical portion 28a between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a. , compressed air, hydrogen gas, and propane gas flowing directly between the outer peripheral surface of the small-diameter cylindrical portion 27b and the inner peripheral surface of the first cylindrical portion 28a toward the tip side of the injection nozzle 23, causing the small-diameter cylindrical portion 27b to be A more complex turbulent flow can be generated between the outer peripheral surface and the inner peripheral surface of the first cylindrical portion 28a. Therefore, in this embodiment, the woody gas injected from the opening at the tip of the small-diameter tubular portion 27b is injected from the tip of the injection nozzle 23 between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. It becomes possible to mix the injected mixed gas more efficiently.

In this embodiment, in the nozzle body 27, the flow paths 27h through which compressed air flows and the flow paths 27j through which hydrogen gas or propane gas flows are alternately arranged at a pitch of 90° with respect to the axis of the large-diameter cylindrical portion 27c. there is Therefore, in this embodiment, it is possible to suppress unevenness in the circumferential direction of the turbulent flow generated between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. Therefore, in this embodiment, the woody gas injected from the opening at the tip of the small-diameter tubular portion 27b is injected from the tip of the injection nozzle 23 between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a. It becomes possible to mix the injected mixed gas more efficiently.

In this embodiment, the gas combustor 5 includes an outer cylinder 20 , an inner cylinder 21 arranged inside the outer cylinder 20 , and a ceramic member 22 arranged inside the inner cylinder 21 . Further, in this embodiment, gaps are formed between the outer tubular portion 20a and the inner tubular portion 21a and between the outer bottom portion 20b and the inner bottom portion 21b. Furthermore, in this embodiment, a large number of through holes 20c are formed in the outer cylindrical portion 20a and the outer bottom portion 20b, and a large number of through holes 21c are formed in the inner cylindrical portion 21a and the inner bottom portion 21b. A flame B is generated outside 20a and outside the outer bottom 20b. Therefore, according to the studies of the inventors of the present application, the gas burner 5 of the present embodiment can burn the woody gas more easily.

In this embodiment, it is possible to reduce the water content of the woody gas inside the inner cylinder 21 by the action of the ceramic member 22 arranged inside the inner cylinder 21 . Further, in this embodiment, the effect of the heated ceramic member 22 makes it possible to suppress the temperature drop inside the inner cylinder 21 . Furthermore, in this embodiment, the woody gas spouted from the through hole 21c of the inner cylinder 21 is retained in the gap between the inner cylinder 21 and the outer cylinder 20, so that the gap between the inner cylinder 21 and the outer cylinder 20 is reduced. It becomes possible to suppress the temperature drop.

Further, in this embodiment, the action of the woody gas spouting out from the through hole 21c of the inner cylinder 21 causes the woody gas remaining in the gap between the inner cylinder 21 and the outer cylinder 20 to generate turbulent flow. The woody gas remaining in the gap between the outer cylinder 20 and the outer cylinder 20 is stirred, and the stirred and homogenized woody gas is ejected from the through hole 20c of the outer cylinder 20 to the outside of the outer cylinder part 20a and the outer bottom part 20b. can be burned outside the In this embodiment, it is presumed that the wood gas can be burned more easily in the gas combustor 5 due to the combination of these factors.

In this embodiment, hydrogen gas and propane gas are supplied to the injection nozzle 23 as auxiliary fuel gas. Therefore, according to the studies of the inventors of the present application, in this embodiment, the gas combustor 5 using the injection nozzle 23 can more easily burn the woody gas. Further, in this embodiment, since the ceramic member 22 is fixed to the inner bottom portion 21b, it is possible to easily position and fix the ceramic member 22 arranged inside the inner cylinder 21. become.

(Other embodiments)
In the form mentioned above, the outer diameter of the large diameter cylinder part 27c of the nozzle main body 27 may be constant. Moreover, in the above-described embodiment, one end of the channel 28e of the cap member 28 and the other end of the channel 28e may be shifted in the left-right direction. Moreover, in the form mentioned above, the flow path 28e may be formed linearly. Furthermore, in the embodiment described above, the number of flow paths 28e formed in the cap member 28 may be seven or less, or may be nine or more. In the above-described embodiment, the other ends of the flow paths 27h and 27j do not have to communicate directly between the outer peripheral surface of the small-diameter tubular portion 27b and the inner peripheral surface of the first tubular portion 28a.

In the form mentioned above, the one end of flow-path 27h, 27j and the other end of flow-path 27h, 27j may shift|deviate in the circumferential direction. Further, in the embodiment described above, the nozzle body 27 may be formed with three or more flow paths 27h through which the compressed air flows. In the above-described embodiment, the nozzle body 27 may have two or more flow paths 27j through which hydrogen gas flows, or two or more flow paths 27j through which propane gas may flow. can be Furthermore, in the embodiment described above, either hydrogen gas or propane gas may not be supplied to the injection nozzle 23 .

In the form mentioned above, the ceramic member 22 may be fixed to the inner cylindrical portion 21a directly or via a predetermined member. In this case, a gap may be formed between the ceramic member 22 and the inner bottom portion 21b. Moreover, in the above-described embodiment, a portion of the inner cylinder 21 may be arranged outside the outer cylinder 20 . Furthermore, in the embodiment described above, one end of the extraction pipe 15 may be connected to the side surface of the secondary combustion chamber 11, or only one combustion chamber may be formed inside the gasifier main body 12. .

Reference Signs List 1 power generation system 2 gasification furnace 3 boiler 4 generator 5 gas combustor 6 steam turbine 20 outer cylinder 20a outer cylinder 20b outer bottom 20c through hole 21 inner cylinder 21a inner cylinder 21b inner bottom 21c through hole 22 ceramic member 23 injection Nozzle 27 Nozzle body 27a Channel (main body side first channel)
27b Small-diameter cylindrical portion 27c Large-diameter cylindrical portion 27h Flow path (main body-side second flow path)
27j channel (main body side third channel)
27k stepped surface 28 cap member 28a first cylindrical portion 28b second cylindrical portion 28c stepped surface 28d flow path (first flow path on the cap side)
28e channel (cap-side second channel)

Claims (8)

An injection nozzle used in a gas combustor for burning wood gas produced from wood chips,
a tubular nozzle body in which a main body-side first channel through which the woody gas flows is formed at the center; and a tubular cap member fixed to the tip side of the nozzle body,
The nozzle body includes a cylindrical small-diameter cylindrical portion forming a tip portion of the nozzle body, and a cylindrical large-diameter cylindrical portion connected to the small-diameter cylindrical portion and having an outer diameter larger than that of the small-diameter cylindrical portion,
The nozzle body is formed with a body-side second flow path through which compressed air flows and a body-side third flow path through which auxiliary fuel gas flows,
One end of the main-body-side second flow path and one end of the main-body-side third flow path are opened at the outer peripheral surface of the large-diameter cylindrical portion, and the other end of the main-body-side second flow path and the main-body-side third flow path are opened. the other end of the passage opens at a step surface formed at the boundary between the small-diameter cylindrical portion and the large-diameter cylindrical portion on the outer peripheral side of the nozzle body;
The cap member includes a cylindrical first cylindrical portion disposed on the outer peripheral side of the small-diameter cylindrical portion, and a cylindrical second cylindrical portion connected to the first cylindrical portion and fixed to the large-diameter cylindrical portion. with
The inner diameter of the first cylindrical portion is smaller than the inner diameter of the second cylindrical portion,
The cap member has an annular cap-side fuel gas into which the compressed air and the auxiliary fuel gas flowing out from the opening at the other end of the second body-side flow path and the opening at the other end of the third body-side flow path flow. 1 channel and a plurality of cap-side second channels communicating from the cap-side first channel to the inner peripheral surface of the first cylindrical portion are formed,
The cap-side first flow path is recessed toward the first cylindrical portion from a step surface formed at the boundary portion between the first cylindrical portion and the second cylindrical portion on the inner peripheral side of the cap member. The shape of the cap-side first flow path when viewed from the axial direction of the cap member formed in a cylindrical shape is annular,
One end of the second cap-side flow path is connected to the first cap-side flow path, and the other end of the second cap-side flow path is open on the inner peripheral surface of the first tubular portion, one end of the second flow path and the other end of the cap-side second flow path are displaced in the circumferential direction of the first cylinder,
The woody gas is injected from an opening at the tip of the small-diameter cylindrical portion,
Mixed gas in which the compressed air and the auxiliary fuel gas are mixed from between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion on the distal end side of the small-diameter tubular portion and the first tubular portion. An injection nozzle characterized in that the is injected. The other end of the main-body-side second flow path and the other end of the main-body-side third flow path also directly communicate between the outer peripheral surface of the small-diameter tubular portion and the inner peripheral surface of the first tubular portion. ,
The compressed air and the auxiliary fuel gas flowing out from the opening at the other end of the second body-side flow path and the opening at the other end of the third body-side flow path flow through the outer peripheral surface of the small-diameter cylindrical portion and the first cylinder. 2. The injection nozzle according to claim 1, characterized in that it also directly flows into a space between the portion and the inner peripheral surface of the portion. Two body-side second flow paths and two body-side third flow paths are formed in the nozzle body,
The main-body-side second flow path and the main-body-side third flow path are alternately arranged at a pitch of 90° with respect to the axis of the large-diameter cylindrical portion formed in a cylindrical shape. 3. The injection nozzle according to claim 1 or 2. The auxiliary fuel gas flowing through one of the main body-side third flow passages of the two main body-side third flow passages is hydrogen gas, and the auxiliary fuel gas flowing through the other main body-side third flow passage. is propane gas. The injection nozzle according to any one of claims 1 to 4, and a metal outer cylinder formed in a bottomed cylindrical shape having a cylindrical outer cylinder portion and an outer bottom portion closing one end of the outer cylinder portion. a metal inner cylinder formed in a bottomed cylindrical shape having a cylindrical inner cylinder part and an inner bottom part closing one end of the inner cylinder part and arranged inside the outer cylinder; A ceramic member made of ceramic disposed in
The inner cylinder is inserted inside the outer cylinder so that the inner bottom portion is arranged on the outer bottom side,
A gap is formed between the outer tubular portion and the inner tubular portion and between the outer bottom portion and the inner bottom portion,
A large number of through holes are formed in the outer cylindrical portion, the outer bottom portion, the inner cylindrical portion and the inner bottom portion,
The injection nozzle injects the woody gas mixed with the mixed gas toward the inside of the inner cylinder,
A gas combustor, wherein flames are generated at least outside the outer tubular portion and outside the outer bottom portion. 6. The gas combustor according to claim 5, wherein said ceramic member is fixed to said inner bottom. A gas combustor according to claim 5 or 6,
A boiler, wherein steam is generated by heat generated in the gas combustor. A gasification furnace for generating the wood gas supplied to the injection nozzle from the wood chips, and a generator having a steam turbine rotated by the steam generated by the boiler. A power generation system characterized by:

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