Fuel gas and air gas mixing structure and combustion machine

Abstract

The present invention provides a gas mixing structure for fuel gas and air and a combustor. The present invention includes an external support structure installed on a housing and a fuel gas array pipe connected to the external support structure, an air inlet is connected to one end of the housing, a gas mixing flow path is provided between the fuel gas array pipe and a mixture outlet, the fuel gas array pipe is composed of a plurality of fuel gas pipes arranged in an array, and the fuel gas pipe is provided with a fuel gas inlet and an exhaust hole provided on the leeward side of the fuel gas pipe. In the present invention, the fuel gas intake pipe is provided in the air flow path, and exhaust holes are provided at intervals on the leeward side of the pipe, and the air is uniformly mixed with the fuel gas ejected from the exhaust hole due to the Coanda effect of the air on the circular pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion devices, and particularly to a fuel gas mixing structure and a combustor.

Background Art

[0002] In the gas mixing structure of a conventional combustor, specifically, fresh air is sucked in from an air intake by a fan, accelerated by the impeller of the fan, and then enters the air duct of the combustor head. Fuel gas enters the fuel gas pipe in the combustor head through a fuel gas pipeline, enters the gas mixing disk holes at the tip of the combustor head through the fuel gas pipe, and the initial mixing of fresh air and fuel gas is completed by the gas mixing disk and ignition occurs. In the combustion process, the fuel gas and air are further mixed and burned out. The gas mixing structure of a conventional combustor has a simple configuration, but the mixing is uneven. It is initially mixed before combustion and mixed while burning, so it becomes locally high-temperature and a large amount of NO x (>150 mg / Nm 3 ) and CO are generated, polluting the environment.

[0003] A staged combustor includes a fuel gas stage and an air stage. Taking the air stage as an example, primary air and fuel gas are mixed to form a primary premixed gas. Since the fuel gas becomes excessive, an over-rich fuel gas is formed. The primary premixed gas reaches the combustion disk through the primary premixed gas flow path and is ignited to form a multi-fuel flame in the center. Secondary air directly mixes around the flame through the secondary air flow path, forming a lean-fuel flame with excess air around the flame. A staged combustor can complete mixing while burning and can solve the pollution problems of NO x (>150 mg / Nm 3 ) and CO to a certain extent, but its structure is complex and there is a problem that the combustion flame becomes intense turbulent flow.

[0004] Currently, full / front premixed combustors with a venturi structure are commercially available. Specifically, air is drawn into the fan through a venturi air intake, and fuel gas is drawn into the fan through a venturi air intake. The fuel gas and air are mixed within the fan (explosion-proof) by high-speed agitation by an impeller. The mixed premix enters the inner cylinder of the combustor head with a metal surface, and the premix reaches the surface of the combustor head through a micro-gap of metal fibers, where it is ignited, forming a surface combustion flame. While this combustor can achieve low CO and NOx emissions, it requires a combination of special fans, valve sets, and venturi intake structures, resulting in a complex structure and control system. Furthermore, because the combustor is a metal surface combustor, it is prone to clogging, tempering, and explosion, posing significant safety risks and requiring frequent maintenance. [Overview of the project] [Problems that the invention aims to solve]

[0005] This invention has been made in view of the above technical problems, and provides a gas mixing structure for fuel gas and a combustor. [Means for solving the problem]

[0006] The technical means of the present invention are as follows:

[0007] The gas mixing structure includes an external support structure installed on a housing and a fuel gas array pipe connected to the external support structure, wherein an air intake port is connected to one end of the housing, a gas mixing passage is provided between the fuel gas array pipe and the mixed gas outlet, the fuel gas array pipe consists of a plurality of fuel gas pipes arranged in an array, and the fuel gas pipe is provided with a fuel gas intake port and an exhaust port provided on the leeward side of the fuel gas pipe.

[0008] Furthermore, the exhaust port is provided on the leeward side of the fuel gas pipe and is formed as a circular hole or a slit.

[0009] Furthermore, the cross-sectional area of ​​a single exhaust port is 1 / 20 to 1 / 2 of the cross-sectional area of ​​the fuel gas pipe.

[0010] Furthermore, multiple circular holes, each with a cross-sectional area 1 / 10th that of the fuel gas pipe, are uniformly arranged in the center of the downwind side of the fuel gas pipe at intervals of five times the hole diameter.

[0011] Furthermore, the arrayed fuel gas pipes are arranged in at least one row.

[0012] Furthermore, if the fuel gas pipes are arranged in multiple rows, the upper and lower rows should be offset from each other.

[0013] Furthermore, the external support structure includes a fuel gas distribution chamber surrounding the fuel gas array pipes, an intake manifold is installed in the fuel gas distribution chamber, one end of each fuel gas pipe is connected to the fuel gas distribution chamber, or both ends of each fuel gas pipe are connected to the fuel gas distribution chamber.

[0014] Furthermore, the fuel gas distribution chamber includes ring-type, C-type, return-type, and single-ended intakes.

[0015] The present invention further provides a combustion machine, which includes a gas mixing structure of the fuel gas and air. [Effects of the Invention]

[0016] This invention utilizes the Coanda effect to uniformly mix air with fuel gas ejected from exhaust ports by providing a fuel gas intake pipe (vertically) in the airflow path and spaced exhaust ports on the leeward side of the pipe. This method of mixing air and fuel gas at the back of the fan eliminates the need to draw fuel gas into the fan and mix it with the impeller inside the fan, thus avoiding the risk of deflagration of the fuel gas-air mixture due to electrostatic discharge caused by mechanical friction generated by the fan's rotation, and thus improving safety. [Brief explanation of the drawing]

[0017] To more clearly explain the technical means in the embodiments of the present invention or the prior art, the drawings related to the embodiments or the prior art will be briefly introduced below. However, the following drawings are only some embodiments of the present invention. It is needless to say that those skilled in the art can obtain other drawings based on these drawings without creative labor.

[0018] [Figure 1] It is a side sectional view of the present invention. [Figure 2] It is a top sectional view of the present invention. [Figure 3] It is a sectional view facing the exhaust port of the present invention. [Figure 4] It is a sectional view facing the air intake port of the present invention. [Figure 5] It is a diagram showing the gas mixing of the present invention. [Figure 6a] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (a) is type a of the return air intake. [Figure 6b] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (b) is type b of the return air intake. [Figure 6c] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (c) is type C air intake. [Figure 6d] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (d) is the single-end type air intake. [Figure 6e] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (e) is type a of the ring type air intake. [Figure 6f] It is a diagram showing an embodiment of the fuel gas distribution chamber in an embodiment of the present invention, where (f) is type b of the ring type air intake.

Modes for Carrying Out the Invention

[0019] To further clarify the objectives, technical means, and merits of the embodiments of the present invention, the technical means in the embodiments of the present invention will be described clearly and completely below with reference to the drawings of the embodiments, and it goes without saying that the embodiments described are not all embodiments but only a selection of embodiments of the present invention. Any other embodiments that a person skilled in the art could obtain without creative work based on the embodiments of the present invention shall all be included within the scope of the present invention.

[0020] As shown in Figures 1 to 4, an embodiment of the present invention is a gas mixing structure for fuel gas and air, comprising an external support structure 2 installed on a housing 1 and a fuel gas array pipe connected to the external support structure 2, wherein an air intake port (i.e., an air intake port) is connected to one end of the housing, a gas mixing passage is provided between the fuel gas array pipe and the mixed gas outlet (i.e., an exhaust port), the fuel gas array pipe consists of a plurality of fuel gas pipes arranged in an array, the fuel gas pipe is provided with a fuel gas intake port and an exhaust port provided on the leeward side of the fuel gas pipe, and the fuel gas discharged from the exhaust port is mixed with air to produce the mixed gas.

[0021] The exhaust vents are located on the leeward side of the fuel gas pipe and are formed as circular or slit-shaped holes. Specifically, a single exhaust vent has a cross-sectional area of ​​1 / 20 to 1 / 2 of the cross-sectional area of ​​the fuel gas pipe. Multiple circular vents, each with a cross-sectional area of ​​1 / 10 of the cross-sectional area of ​​the fuel gas pipe, are distributed uniformly in the center of the leeward side of the fuel gas pipe at intervals of five times the diameter of the vents.

[0022] The aforementioned array of fuel gas pipes is arranged in at least one row. As shown in Figure 5, if there are multiple rows of fuel gas pipes, two adjacent rows are offset from each other.

[0023] The external support structure and housing constitute a fuel gas distribution chamber, and an intake manifold is provided in the housing of the fuel gas distribution chamber, with one end of each fuel gas pipe communicating with the fuel gas distribution chamber or both ends of each fuel gas pipe communicating with the fuel gas distribution chamber. Specific embodiments are shown in Figures 6a to 6f, and the fuel gas distribution chamber includes ring-type, C-type, return-type, and single-ended intakes. Specifically, in the return-type intake shown in Figure 6a, each fuel gas pipe is kept parallel to the intake manifold; in the return-type intake shown in Figure 6b, each fuel gas pipe is kept perpendicular to the intake manifold, and the fuel gas is returned and circulated; in the C-type intake shown in Figure 6c, the end is closed, and each fuel gas pipe is kept parallel to the intake manifold; in the single-ended intake shown in Figure 6d, each fuel gas pipe is kept perpendicular to the intake manifold, both the left and right ends are closed, and the fuel gas that passes through flows through each fuel gas pipe; and in the ring-type intake shown in Figures 6e and 6f, it is the same as the return-type intake shown in Figures 6a and 6b, differing in that the circulation path is ring-shaped.

[0024] Finally, the following should be explained: The above embodiments are merely for illustrating, and not limiting, the technical means of the present invention. Although the present invention has been described in detail with reference to the embodiments described above, it is possible to modify the technical means described in the embodiments above, or to make equivalent substitutions to some or all of their technical features, and it will be understood by those skilled in the art that such modifications or substitutions do not cause the essence of the corresponding technical means to deviate from the scope of the technical means of the embodiments of the present invention.

[0025] (Note) (Note 1) It includes an external support structure installed on the housing and fuel gas array pipes connected to the external support structure, The air intake is connected to one end of the housing. A gas mixing passage is provided between the fuel gas array pipe and the mixed gas outlet. The aforementioned fuel gas array pipe consists of a plurality of fuel gas pipes arranged in an array. A fuel gas and air gas mixing structure characterized in that the fuel gas pipe is provided with a fuel gas intake port and an exhaust port located on the leeward side of the fuel gas pipe.

[0026] (Note 2) The fuel gas and air gas mixing structure according to Appendix 1, characterized in that the exhaust port is provided on the leeward side of the fuel gas pipe and is formed in the shape of a circular hole or a slit.

[0027] (Note 3) The fuel gas and air gas mixing structure according to Appendix 1, characterized in that the cross-sectional area of ​​a single exhaust port is 1 / 20 to 1 / 2 of the cross-sectional area of ​​the fuel gas pipe.

[0028] (Note 4) The fuel gas and air gas mixing structure according to Appendix 1, characterized in that the exhaust port is arranged such that a plurality of circular holes, each with a cross-sectional area of ​​1 / 10 of the cross-sectional area of ​​the fuel gas pipe, are uniformly arranged at intervals of five times the diameter of the holes in the center of the downwind side of the fuel gas pipe.

[0029] (Note 5) The fuel gas and air gas mixing structure according to Appendix 1, characterized in that the arrayed fuel gas pipes are in at least one row.

[0030] (Note 6) The fuel gas and air gas mixing structure according to Appendix 5, characterized in that, when there are multiple rows of fuel gas pipes, two adjacent rows are arranged with a staggered arrangement.

[0031] (Note 7) The fuel gas and air gas mixing structure according to Appendix 1, characterized in that the external support structure and housing constitute a fuel gas distribution chamber, an intake manifold is provided in the housing of the fuel gas distribution chamber, and one end of each fuel gas pipe communicates with the fuel gas distribution chamber or both ends of each fuel gas pipe communicate with the fuel gas distribution chamber.

[0032] (Note 8) The fuel gas and air gas mixing structure according to Appendix 7, characterized in that the fuel gas distribution chamber includes ring-type, C-type, return-type, and single-ended intakes.

[0033] (Note 9) A combustion machine having a gas mixing structure of fuel gas and air as described in any one of the appendices 1 to 8. [Explanation of Symbols]

[0034] 1 cabinet 2 External support structure 3 Fuel gas pipe 4 exhaust ports 5. Intake Manifold

Claims

1. It includes an external support structure installed on the housing and fuel gas array pipes connected to the external support structure, The air intake is connected to one end of the housing. A gas mixing passage is provided between the fuel gas array pipe and the mixed gas outlet. The aforementioned fuel gas array pipe consists of a plurality of fuel gas pipes arranged in an array. The fuel gas pipe is provided with a fuel gas intake port and an exhaust port located on the leeward side of the fuel gas pipe. The external support structure and the housing constitute a fuel gas distribution chamber, an intake manifold is provided in the housing of the fuel gas distribution chamber, and both ends of each fuel gas pipe are connected to the fuel gas distribution chamber. The fuel gas distribution chamber includes a ring-type, return-type intake structure. In the aforementioned ring-shaped intake structure, each fuel gas pipe is kept parallel or perpendicular to the intake manifold, and the fuel gas circulation path is ring-shaped. In the aforementioned return-type intake structure, each fuel gas pipe is kept parallel or perpendicular to the intake manifold, and the fuel gas circulation path is of the return type. The exhaust hole is formed in the shape of a circular hole, The exhaust port is arranged such that a plurality of circular holes, each with a cross-sectional area of ​​1 / 10 of the cross-sectional area of ​​the fuel gas pipe, are uniformly arranged at intervals of five times the diameter of the holes in the center of the leeward side of the fuel gas pipe. A gas mixing structure of fuel gas and air, characterized by the following features.

2. The fuel gas and air gas mixing structure according to claim 1, characterized in that the arrayed fuel gas pipes are in at least one row.

3. The fuel gas and air gas mixing structure according to claim 2, characterized in that, when there are multiple rows of fuel gas pipes, two adjacent rows are arranged with a staggered arrangement.

4. A combustion machine comprising a gas mixing structure of fuel gas and air as described in any one of claims 1 to 3.

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