Gas mixing device of biomass direct combustion furnace

Abstract

The utility model discloses a biomass direct combustion furnace gas mixing device which comprises a shell and a gas inlet pipe, one side of the shell is covered with a cover body, a dispersion cover is installed in the shell, the interior of the shell is divided into a gas inlet cavity and a mixing cavity through the dispersion cover, the dispersion cover comprises a plurality of meshes, the gas inlet cavity is communicated with the mixing cavity through the meshes, the shell comprises a gas inlet, and the gas inlet is communicated with the mixing cavity through the meshes. The cover body comprises an air outlet pipe, the air outlet pipe is communicated with the mixing cavity, and the air inlet pipe is communicated with the mixing cavity. After entering the mixing cavity, air drives the fan to rotate and is mixed with oxygen sprayed out of the second fan blade, and the mixing effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler gas supply technical field more specifically, relate to a kind of biomass direct-fired furnace gas mixing device. BACKGROUND

[0002] The nitrogen content of straw and other biomass agricultural wastes is relatively high. If the combustion is not sufficient, the content of nitrogen oxides produced after combustion will be higher than the emission standard. In order to solve this problem, the current biomass direct-fired furnace will introduce a small amount of oxygen when supplying air (air) to increase the oxygen content entering the biomass direct-fired furnace, thereby improving its combustion effect. However, due to the defects in the structure of the current gas mixing device, the mixing uniformity of oxygen and air is poor, and the gas that has not been fully mixed enters the combustion chamber of the biomass direct-fired furnace, which may cause local insufficient combustion. Therefore, improvement is urgently needed. SUMMARY

[0003] The utility model aims at overcoming the deficiency of prior art, provide a kind of biomass direct-fired furnace gas mixing device, air enters mixing cavity after driving fan rotation, and with the oxygen that is sprayed from second fan blade mixes, and mixing effect is good.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a biomass direct-fired furnace gas mixing device, comprising a shell and an air inlet pipe, the shell is covered with a cover on one side, a dispersion cover is installed inside the shell, the shell is divided into an air inlet cavity and a mixing cavity by the dispersion cover, the dispersion cover comprises a plurality of mesh holes, the air inlet cavity and the mixing cavity are communicated through the mesh holes, the shell comprises an air inlet, the air inlet is communicated with the air inlet cavity, the cover comprises an air outlet pipe, the air outlet pipe is communicated with the mixing cavity, and the air inlet pipe is communicated with the mixing cavity.

[0005] Further, a fan capable of rotating is installed in the mixing cavity.

[0006] Further, the fan comprises a hub, a plurality of first fan blades and at least one second fan blade are arranged on the periphery of the hub, and the first fan blades and the second fan blades are uniformly distributed along the periphery of the hub.

[0007] Further, the second fan blade is provided with a cavity inside, the air inlet pipe is communicated with the cavity, a plurality of air outlet holes are arranged on the surface of the second fan blade, and the air outlet holes are communicated with the cavity.

[0008] Further, a convex column is arranged on one side of the mixing cavity in the middle of the dispersion cover, an installation groove is arranged in the hub, the convex column is inserted into the installation groove, and the convex column and the installation groove are connected through a bearing.

[0009] Further, the convex column is internally provided with a first air passing channel, the air inlet pipe is inserted into the first air passing channel after being penetrated out of the shell, the hub is internally provided with a second air passing channel, and the air inlet pipe, the first air passing channel, the mounting groove, the second air passing channel and the cavity are communicated.

[0010] Further, the air outlet pipe is a spiral pipe, and the inner wall of the air outlet pipe is provided with spiral ribs.

[0011] Further, the inner wall of the shell is provided with a first annular rib, the outer side of the dispersing cover is provided with a second annular rib, the first annular rib abuts against the second annular rib, the first annular rib and the second annular rib are fixed by bolts, the side surface of the second annular rib is provided with an annular cover, the end of the annular cover abuts against the inner side of the cover body, and the mixing cavity is located in the area surrounded by the annular cover.

[0012] Further, the cross section of the dispersing cover is arc-shaped and protrudes towards the air inlet cavity.

[0013] Further, the side of the hub towards the dispersing cover is a conical surface.

[0014] In summary, the utility model has the following beneficial effects:

[0015] 1. The cross section of the dispersing cover is arc-shaped and protrudes towards the air inlet cavity, the arc-shaped surface can guide the air in the air inlet cavity, so that the air is dispersed, the uniformity of the air and oxygen mixed in the mixing cavity is improved, the air outlet pipe is a spiral pipe, the inner wall of the air outlet pipe is provided with spiral ribs, after the air and oxygen are mixed in the mixing cavity, part of the mixed gas in the air outlet pipe can be transported along the spiral ribs, so that the spiral transportation of the gas is realized, the air and oxygen can be mixed again, the uniformity of the gas mixing is improved, and the combustion effect of the biomass direct combustion furnace is improved.

[0016] 2. The oxygen in the air inlet pipe sequentially passes through the first air passing channel, the mounting groove, the second air passing channel and the cavity, and finally flows into the mixing cavity from the air outlet hole, in the process of inputting into the mixing cavity, the air synchronously drives the fan to rotate, so that the rotational air outlet of the oxygen is realized, the oxygen is distributed and mixed in the mixing cavity more uniformly through the dynamic air outlet mode, and the mixing effect with the air is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the embodiment;

[0018] Figure 2 It is a partial structural schematic view of the embodiment;

[0019] Figure 3 It is a structural schematic view of the fan.

[0020] Reference numerals: 1. Shell; 11. Air inlet; 12. First annular rib; 2. Cover; 21. Air outlet pipe; 3. Dispersion cover; 31. Mesh; 32. Protrusion; 33. First air passage; 34. Second annular rib; 35. Annular cover; 4. Fan; 41. Hub; 42. First fan blade; 43. Mounting groove; 44. Second air passage; 5. Second fan blade; 51. Cavity; 52. Air outlet; 6. Air inlet pipe; 7. Bearing; 8. Air inlet chamber; 9. Mixing chamber. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 3 As shown, this embodiment discloses a gas mixing device for a biomass direct-fired furnace, including a shell 1 and an inlet pipe 6. A cover 2 is fitted onto one side of the shell 1, and the shell 1 and the cover 2 are fixed together by bolts. A dispersion hood 3 is installed inside the shell 1. A first annular rib 12 is provided on the inner wall of the shell 1, and a second annular rib 34 is provided on the outer side of the dispersion hood 3. The first annular rib 12 abuts against the second annular rib 34, and the first annular rib 12 and the second annular rib 34 are fixed together by bolts. Multiple bolts are used to fix the shell 1 and the dispersion hood 3, ensuring good fixing reliability. An annular cover 35 is provided on the side of the second annular rib 34, and the end of the annular cover 35 abuts against the inner side of the cover 2. By providing the annular cover 35, the cover 2 can be supported, improving the installation strength of the cover 2. The shell 1, the cover 2, and the dispersion hood 3 are all made of metal, providing good strength.

[0023] like Figure 1 As shown, the interior of the housing 1 is divided into an air intake chamber 8 and a mixing chamber 9 by a dispersion cover 3. The mixing chamber 9 is located in the area enclosed by an annular cover 35. The dispersion cover 3 includes a plurality of mesh holes 31. The air intake chamber 8 and the mixing chamber 9 are connected through the mesh holes 31. The housing 1 includes an air inlet 11, which is connected to the air intake chamber 8. The cover 2 includes an air outlet pipe 21, which is connected to the mixing chamber 9. The air inlet pipe 6 is connected to the mixing chamber 9.

[0024] The air inlet 11 is connected with an air supply mechanism (not shown in the figure), through which the air outside is compressed and delivered into the air inlet 11, and then into the air inlet cavity 8, and then dispersed into the mixing cavity 9 through the plurality of mesh holes 31. One end of the air inlet pipe 6 is connected with an external oxygen supply mechanism (not shown in the figure), through which the oxygen is delivered into the mixing cavity 9 from the air inlet pipe 6. The other end of the air outlet pipe 21 is connected with the biomass direct combustion furnace. The air and oxygen mixed in the mixing cavity 9 enter the biomass direct combustion furnace through the air outlet pipe 21 for air supply of the biomass direct combustion furnace.

[0025] The dispersion cover 3 is arc-shaped in cross section and protrudes towards the air inlet cavity 8. By arranging the arc-shaped surface, the air in the air inlet cavity 8 can be guided, so that the air is dispersed, thereby improving the uniformity of the mixing of the air and oxygen in the mixing cavity 9. The air outlet pipe 21 is a spiral pipe, and the inner wall of the air outlet pipe 21 is provided with a spiral rib. After the air and oxygen are mixed in the mixing cavity 9, part of the mixed gas entering the air outlet pipe 21 can be delivered along the spiral rib, thereby realizing spiral delivery of the gas, so that the air and oxygen can be mixed again, improving the uniformity of the gas mixing, thereby being beneficial to improving the combustion effect of the biomass direct combustion furnace.

[0026] The mixing cavity 9 is provided with a rotatable fan 4. Specifically, the fan 4 includes a hub 41, the middle part of the dispersion cover 3 towards one side of the mixing cavity 9 is provided with a protruding column 32, the hub 41 is provided with a mounting groove 43, the protruding column 32 is inserted into the mounting groove 43, and the protruding column 32 and the mounting groove 43 are connected through a bearing 7. The air after passing through the mesh holes 31 still has a certain flow rate, which can drive the fan 4 to rotate. Through the rotation of the fan 4, the gas in the mixing cavity 9 can be stirred, thereby facilitating the mixing of the air and oxygen.

[0027] As shown in Figure 3 The hub 41 is provided with a plurality of first blades 42 and at least one second blade 5 around the side. The first blades 42 and the second blade 5 are uniformly distributed around the side of the hub 41. In the embodiment, the number of the second blade 5 is one. The first blades 42 and the second blade 5 are both welded and fixed with the hub 41. The first blades 42 and the second blade 5 form a spiral blade structure, which is beneficial to the rotation of the fan 4 driven by the air.

[0028] As shown in Figure 1 and Figure 2As shown, the second fan blade 5 is a hollow structure, specifically, a cavity 51 is arranged inside the second fan blade 5, the air inlet pipe 6 is communicated with the cavity 51, a plurality of air outlet holes 52 are arranged on the surface of the second fan blade 5, the air outlet holes 52 are communicated with the cavity 51, a first air passing channel 33 is arranged inside the convex column 32, one end of the air inlet pipe 6 is arranged outside the shell 1 and the other end is inserted into the first air passing channel 33, a second air passing channel 44 is arranged inside the wheel hub 41, the air inlet pipe 6, the first air passing channel 33, the mounting groove 43, the second air passing channel 44 and the cavity 51 are communicated;

[0029] The oxygen in the air inlet pipe 6 passes through the first air passing channel 33, the mounting groove 43, the second air passing channel 44 and the cavity 51 in sequence and finally flows into the mixing cavity 9 from the air outlet hole 52, in the process of inputting into the mixing cavity 9, the air synchronously drives the fan 4 to rotate, so that the rotational air outlet of the oxygen can be realized, and the oxygen can be more uniformly distributed and mixed in the mixing cavity 9 through the dynamic air outlet mode, so that the mixing effect with the air can be greatly improved.

[0030] The wheel hub 41 is a conical surface towards one side of the dispersion cover 3, through the arrangement of the conical surface, the air can be guided, the rotating resistance of the fan 4 is reduced, and the rotation of the fan 4 is facilitated.

[0031] The above only is the preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present application belong to the protection scope of the present application. It should be pointed out that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application, these improvements and decorations should also be regarded as the protection scope of the present application.

Claims

1. A biomass direct combustion boiler gas mixing device, characterized in that, The utility model provides a kind of air mixing device, including shell (1) and intake pipe (6), the shell (1) one side is covered with cover (2), the shell (1) inside is equipped with dispersion cover (3), the shell (1) inside is divided into intake cavity (8) and mixing cavity (9) by dispersion cover (3), the dispersion cover (3) includes multiple mesh (31), the intake cavity (8) and mixing cavity (9) are communicated by mesh (31), the shell (1) includes air inlet (11), the air inlet (11) is communicated with intake cavity (8), the cover (2) includes air outlet pipe (21), the air outlet pipe (21) is communicated with mixing cavity (9), the intake pipe (6) is communicated with mixing cavity (9).

2. The biomass direct combustion boiler gas mixing device according to claim 1, characterized in that, A rotatable fan (4) is installed in the mixing cavity (9).

3. The biomass direct combustion boiler gas mixing device according to claim 2, wherein, The fan (4) includes a hub (41), a plurality of first blades (42) and at least one second blade (5) are arranged on the periphery of the hub (41), and the first blades (42) and the second blade (5) are uniformly distributed along the periphery of the hub (41).

4. The biomass direct combustion boiler gas mixing device according to claim 3, characterized in that, The second blade (5) is internally provided with a cavity (51), the intake pipe (6) is communicated with the cavity (51), and a plurality of air outlet holes (52) are arranged on the surface of the second blade (5), and the air outlet holes (52) are communicated with the cavity (51).

5. The biomass direct combustion boiler gas mixing device according to claim 4, wherein, A convex column (32) is arranged on one side of the dispersion cover (3) towards the mixing cavity (9), a mounting groove (43) is arranged in the hub (41), the convex column (32) is inserted into the mounting groove (43), and the convex column (32) and the mounting groove (43) are connected through a bearing (7).

6. The biomass direct combustion boiler gas mixing device according to claim 5, wherein, The convex column (32) is internally provided with a first air passage (33), one end of the intake pipe (6) is arranged outside the shell (1) and the other end is inserted into the first air passage (33), and a second air passage (44) is arranged in the hub (41), and the intake pipe (6), the first air passage (33), the mounting groove (43), the second air passage (44) and the cavity (51) are communicated.

7. The biomass direct combustion boiler gas mixing device of claim 1, wherein, The air outlet pipe (21) is a spiral pipe, and the inner wall of the air outlet pipe (21) is provided with a spiral rib.

8. The biomass direct combustion boiler gas mixing device of claim 1, wherein, A first annular rib (12) is arranged on the inner wall of the shell (1), a second annular rib (34) is arranged on the outer side of the dispersion cover (3), the first annular rib (12) abuts against the second annular rib (34), the first annular rib (12) and the second annular rib (34) are fixed through bolts, a ring cover (35) is arranged on the side surface of the second annular rib (34), the end of the ring cover (35) abuts against the inner side of the cover (2), and the mixing cavity (9) is located in the area surrounded by the ring cover (35).

9. The biomass direct combustion boiler gas mixing device of claim 1, wherein, The cross section of the dispersion cover (3) is arc-shaped and protrudes towards the intake cavity (8).

10. The biomass direct combustion boiler gas mixing device of claim 3, wherein, The side of the hub (41) towards the dispersion cover (3) is a conical surface.

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