JP3118876U - Backfire prevention unit and combustion gas injection device - Google Patents

Abstract

The present invention relates to a backfire prevention unit and a combustion gas injection device capable of reliably preventing a flame from reversing when combustion gas containing oxyhydrogen gas is combusted and reducing the maintenance cost. Provided.
A coupling body 12 having a through hole 15 communicating from one end opening 13 to the other end opening 14 and a mesh body 22 coupled to one end opening 13 side of the coupling body 15 to diffuse inflowing combustion gas. And a permeation permeation heat-resistant body 32 that is connected to the opening 14 side of the other end and increases the jetting speed of the outflowing combustion gas. A backfire prevention unit 11 that can be blocked on the 32 side was formed. Further, the combustion gas injection device 41 is provided by disposing the backfire prevention unit 11 in the gas flow path 52 for supplying the combustion gas to the injection nozzle 42 side so that the permeation and permeation heat-resistant body 32 side is located on the downstream side. Formed.
[Selection] Figure 1

Description

  The present invention relates to a backfire prevention unit and a combustion gas injection device that can reliably prevent a flame reversing from the injection nozzle side during combustion of combustion gas.

  Oxyhydrogen gas, which belongs to the category of combustion gas and is also referred to as brown gas, is a mixed gas having a mixing ratio of hydrogen and oxygen of 2: 1 and is produced by water electrolysis. Moreover, the oxyhydrogen gas containing oxygen can be burned without supplying oxygen separately, and since the combustion product is only water, it does not pollute the environment.

  In addition, since the oxyhydrogen gas satisfies the complete combustion condition and does not need to be ventilated during the combustion, the oxyhydrogen gas can be positioned as a combustion gas having conditions that can be suitably used as heating energy.

  However, since oxyhydrogen gas has a very high burning rate, it has a high possibility of causing a flashback phenomenon, and an explosion sound is generated when the flashback phenomenon occurs. There was an inconvenience.

For such inconveniences observed when oxyhydrogen gas is used as the combustion gas, it is possible to prevent the occurrence of an unpleasant explosion by preventing the occurrence of a flashback phenomenon. A technology such as a brown gas combustion burner has been proposed.
Japanese Patent No. 3627217

  FIG. 4 is a cross-sectional view showing the internal structure of the brown gas combustion burner disclosed in Patent Document 1. According to the figure, the entire brown gas combustion burner 1 is composed of a burner body 2 having a brown gas flow path 3 in which a brown gas inlet 3a and a brown gas injection port 3b communicate with each other, and a porous body having fine pores. The backfire prevention means 4 formed in the brown gas flow path 3 of the burner body 2 and an ignition burner for igniting the brown gas injected through the brown gas injection port 3b are provided outside the burner body 2. It is provided with at least a burner tile 5 that is installed and guides the flame.

  For this reason, since the porous body constituting the backfire prevention means 4 can increase the flow rate of the brown gas by passing through the fine holes, it prevents the flame from moving backward in the fine holes. Backfire can be prevented.

  However, in the case of the disclosed technique shown in FIG. 4, the burner body 2, the backfire prevention means 4, and the burner tile 5 are integrally assembled. In addition to the corresponding member, the entire member must be replaced in a lump, resulting in an inconvenience that maintenance costs increase accordingly.

  In view of the above problems of the prior art including the brown gas combustion burner shown in FIG. 4, the present invention reliably prevents the flame from reversing when burning the combustion gas containing oxyhydrogen gas. An object of the present invention is to provide a backfire prevention unit and a combustion gas injection device that can reduce the maintenance cost.

  The present invention has been made to achieve the above object, and a first device (backfire prevention unit) of the present invention includes a connecting body having a through-hole communicating from one end opening to the other end opening, A mesh body that is connected to the one end opening side of the connecting body to filter and diffuse the inflowing combustion gas, and a permeation permeation heat-resistant body that is connected to the other end opening side to increase the ejection speed of the outflowing combustion gas. The most important feature is that the flame that reversely moves in the gas flow path from the injection nozzle side can be blocked on the permeation and permeation heat-resistant body side.

  Further, in a second device (combustion gas injection device), the backfire prevention unit is disposed in the gas flow path for supplying the combustion gas to the injection nozzle side so that the permeation permeation heat-resistant body side is located on the downstream side. The most important feature is that

  In this case, the spray nozzle is separated from the backfire prevention unit positioned upstream thereof via a pipe line, or is detachably connected via the connecting body constituting the backfire prevention unit. can do.

  Among the present inventions, according to the first invention, the mesh body disposed on the upstream side of the gas flow path and the permeation heat-resistant body disposed on the downstream side are integrally coupled via the coupling body. Since it is unitized, it can be placed in the gas flow path at an appropriate position unrelated to the injection nozzle side, and the maintenance cost can be repaired and replaced separately from the injection nozzle as necessary. Can also be reduced.

  Further, according to the second invention, the backfire prevention unit is disposed in the gas flow path for supplying the combustion gas to the injection nozzle side so that the permeation permeation heat-resistant body side is located on the downstream side. By increasing the ejection speed of the combustion gas flowing out from the heat-resistant body side, it is possible to reliably prevent the flame from going backward in the gas flow path from the injection nozzle side. In addition, since the backfire prevention unit can be repaired and replaced separately from the injection nozzle, the maintenance cost can be reliably reduced.

  FIG. 1 is an explanatory view showing a cross-sectional structure of an example of a combustion gas injection device according to a second device of the present invention. The backfire prevention unit according to the first device is connected to the injection nozzle side through a pipe line. It is formed by connecting.

  According to the figure, the flashback prevention unit 11 according to the first device includes a connecting body 12 having a through hole 15 communicating from one end opening 13 to the other end opening 14, and one end opening of the connecting body 12. The mesh body 22 is connected to the 13 side, and the permeation and permeation heat-resistant body 32 is connected to the other end opening 14 side.

  Among these, the connecting body 12 made of an appropriate metal material has a large-diameter portion 16 having a thick outer peripheral surface located at the center portion in the hole direction of the through-hole 15, and the large-diameter portion. The two sides partitioned by 16 are formed as small diameter portions 17 and 18 which are thin.

  The mesh body 22 includes a bottomed hollow cylindrical body portion 23 made of an appropriate metal material that is screwed and connected to the one end opening portion 13 side of the coupling body 12, and an outer peripheral side of the cylindrical body portion 23. And a cylindrical mesh portion 25 made of a metal material covering the flow, and a flow from the through hole 26 provided in the peripheral wall portion 25 of the hollow cylindrical body portion 23 to the through hole 15 of the connected body 12 at the time of the connection. Roads are secured. In addition, the cylindrical mesh part 25 is formed in the arrangement | positioning relationship which can be extracted from the hollow cylinder part 23 side when the hollow cylinder part 23 is made to detach | leave from the connection body 12 side.

  Further, the permeation heat-resistant body 32 having a bottomed cylindrical shape is formed of a suitable heat-resistant member such as ceramics, and the opening 33 side of the connection body 12 is screwed and connected to the other end opening portion 14 side. It is formed by providing air permeability that can increase the jetting speed of the outflowing combustion gas on the peripheral surface 34 side including the peripheral side surface and the top surface. For this reason, at the time of the connection, the flow path which passes the peripheral surface 34 side of the osmosis | permeation permeation | transmission heat-resistant body 32 from the through-hole 15 of the connection body 12 is ensured. That is, the combustion gas flowing out from the other end opening 14 side can pass through the peripheral surface 34 side of the permeation and permeation heat-resistant body 32 to increase the jetting speed and jet out to the downstream side.

  In this case, as shown in FIG. 3, the connecting body 12 can be formed by providing a structure in which the connecting nozzle 12 can be freely attached to and detached from the injection nozzle 42 side. That is, unlike the example shown in FIG. 1, the connecting body 12 is formed to have a large-diameter portion 16 whose entire thickness is uniform, and on the other end opening 14 side. An annular projecting portion 19 is provided on the open end surface 14 a, and the annular projecting portion 19 is interposed so as to be fitted or screwed to the injection nozzle 42 side.

  Next, the combustion gas injection device according to the second device will be described with reference to FIG. 1. The backfire prevention unit 11 according to the first device is provided in the gas passage 52 for supplying the combustion gas to the injection nozzle 42 side. The combustion gas injection device 41 as a whole is configured.

  In this case, the combustion gas injection device 41 is formed by disposing the injection nozzle 42 and the backfire prevention unit 11 arranged upstream thereof from each other via the pipe line 53. This will be described in more detail with reference to FIG. 1. The injection nozzle 42 made of an appropriate metal material has a space portion 43 inside, and combustion gas is contained in the space portion 43 on an appropriate side surface 44 thereof. A large-diameter inlet 45 for introducing gas, and a plurality of small-diameter injection holes directed to a direction perpendicular to the direction of introduction of the combustion gas from the inlet 45 on the other side surface 46 adjacent thereto. 47 are formed.

  In addition, the injection nozzle 42 is connected to the permeation and permeation heat-resistant body 32 side that is spaced from the other end opening 14 side of the flashback prevention unit 11 via a connection pipe 54 that forms a pipe line 53. In this case, the one end opening 13 side in the backfire prevention unit 11 is connected to one end side of the elbow pipe 55, and the other end side is secured by a combustion gas supply source side (not shown), a straight pipe 56, and the like arranged on the upstream side. The gas channel 52 communicates with each other.

  FIG. 2 is an explanatory diagram showing a combustion gas injection device 41 formed with a different piping configuration from the example shown in FIG. 1 under a corresponding relationship with FIG. In this example, the combustion gas injection device 41 includes a connection pipe 52 having one end directly connected to an introduction port 45 on one side 44 of the injection nozzle 42, and the other end opening 14 side of the connection body 12 in the backfire prevention unit 11. By arranging an elbow pipe 55 between the small diameter portion 18 and the connecting pipe 47 directly connected at one end thereof, the injection nozzle 42 and the backfire prevention unit 11 side are spaced apart from each other. Is formed.

  FIG. 3 is an explanatory view showing a cross-sectional structure of another example of the combustion gas injection device according to the second invention, and the combustion gas injection device 41 has a large overall wall thickness. A backfire prevention unit 11 having a connecting body 12 having a diameter portion 16 and having an annular protrusion 19 on an open end surface 14a on the other end opening 14 side, and an annular protrusion provided on the open end surface 14a of the connection body 12 It is formed by an injection nozzle 42 that is connected through a portion 19 so as to be fitted or screwed together.

  In this case, the injection nozzle 42 has an introduction port 45 formed on the side of the surface facing the injection port 47, and the permeation and permeation heat-resistant body 32 side in the flashback prevention unit 11 is passed through the introduction port 45. It can be arranged in the space 43.

  Next, the operation and effect of the present invention having the above configuration will be described while correlating the backfire prevention unit 11 as the first idea and the combustion gas injection device 41 as the second idea.

  That is, in the combustion gas injection device 41 shown in FIGS. 1 and 2, the backfire prevention unit 11 is positioned on the downstream side in the permeation permeation heat-resistant body 32 in the gas flow path 52 that supplies the combustion gas to the injection nozzle 42 side. In this way, it is formed by interposing.

  That is, the backfire prevention unit 11 can be disposed in the gas flow path 52 at an appropriate position unrelated to the injection nozzle 42 side, and therefore repaired and replaced separately from the injection nozzle 42 as necessary. Therefore, the maintenance cost can be reduced.

  Further, the backfire prevention unit 11 itself integrally connects the mesh body 22 disposed on the upstream side of the gas flow path 52 and the permeation and permeation heat-resistant body 32 disposed on the downstream side via the coupling body 12. Since it is unitized, it can be easily removed and repaired or replaced.

  Further, the backfire prevention unit 11 introduces the combustion gas into the through-hole 15 of the connecting body 12 while filtering and diffusing the gas through the mesh body 22 arranged on the upstream side of the gas flow path 52, and the injection nozzle 42. Can be sent to the side. In this case, the combustion gas introduced into the space 43 of the injection nozzle 42 is injected under uniform injection pressure from each injection port 47 while swirling in the space 43. .

  Moreover, the combustion gas introduced into the through hole 15 of the connecting body 12 passes through the peripheral surface 34 of the permeation permeation heat-resistant body 32 arranged on the downstream side thereof, so that the ejection speed is increased when the combustion gas passes therethrough. Under the state, it will be ejected from the permeation and transmission heat-resistant body 32 side.

  Accordingly, the permeation and permeation heat-resistant body 32 surely prevents the flame from reversing in the gas flow path 52 from the injection nozzle 42 side by ejecting the combustion gas at a particularly high ejection speed. Can be prevented.

  In addition, according to the present invention, since the occurrence of flashback can be reliably prevented in this way, an explosion sound is generated when a flashback phenomenon occurs, causing anxiety and discomfort to workers. Generation can also be wiped out.

  On the other hand, in the case of the combustion gas injection device 41 shown in FIG. 3, in addition to the above-described operation and effect, the backfire prevention unit 11 and the injection nozzle 42 are detachably directly connected, so that the connecting pipe 54 and the elbow pipe It is possible to simplify the structure of the apparatus by eliminating the interposition of 55.

  Moreover, since the permeation | transmission heat-resistant body 32 side in the backfire prevention unit 11 will be arrange | positioned in the space part 43 of the injection nozzle 42, generation | occurrence | production of a backfire can be prevented more reliably.

  The above is the description of the present invention based on the drawings, and the specific content is not limited to this. For example, as the combustion gas, various flammable gases other than oxyhydrogen gas can be used, and the structure of the backfire prevention unit 11 and the structure of the injection nozzle 42 can be appropriately changed according to the properties of the flammable gas. it can.

Explanatory drawing which shows the cross-sectional structure about an example of the combustion gas injection apparatus which concerns on the 2nd invention in this invention. FIG. 2 is an explanatory diagram showing a combustion gas injection device formed with a pipe configuration different from that of the example shown in FIG. Explanatory drawing which shows the cross-section about the other example of the combustion gas injection apparatus which concerns on a 2nd invention. Sectional drawing which shows the internal structure of the burner for brown gas combustion shown by patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Backfire prevention unit 12 Connection body 13 One end opening part 14 Other end opening part 14a Open end surface 15 Through-hole 16 Large diameter part 17, 18 Small diameter part 19 Annular protrusion part 22 Mesh body 23 Hollow cylinder part 24 Opening 25 Perimeter wall part 26 Through-hole 27 Cylindrical mesh part 32 Permeation permeation heat-resistant body 33 Opening 34 Circumferential surface 41 Combustion gas injection device 42 Injection nozzle 43 Space part 44 One side 45 Introduction port 46 Other side 47 Injection port 52 Gas flow path 53 Pipe line 54 Connection pipe 55 Elbow pipe 56 Straight pipe

Claims (4)

  A connecting body having a through hole leading from the one end opening to the other end opening; a mesh body connected to the one end opening side of the connecting body for filtering and diffusing inflowing combustion gas; and the other end opening A permeation heat-resistant body that is connected to the side to increase the ejection speed of the outflowing combustion gas, and the flame that reversely moves in the gas flow path from the injection nozzle side can be freely blocked on the permeation-permeation heat resistance side. A backfire prevention unit.   Combustion gas injection, characterized in that a backfire prevention unit according to claim 1 is disposed in a gas flow path for supplying combustion gas to the injection nozzle side so that the permeation and permeation heat-resistant body side is located on the downstream side. apparatus.   The combustion gas injection device according to claim 2, wherein the injection nozzle is separated from the flashback prevention unit located upstream of the injection nozzle via a pipe line. The combustion gas injection apparatus according to claim 2, wherein the injection nozzle is detachably connected via the connection body that is positioned upstream of the injection nozzle and forms a backfire prevention unit.

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