Plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl

Abstract

The present invention discloses a plasma waste gas high-temperature treatment system with impingement of flame division and swirl, which includes a combustion cavity and a cooling cavity; there is a flame division cavity in the combustion cavity; a gas mixing cavity is formed by the limitation between the flame division cavity and the combustion cavity; a plasma torch extends into the flame division cavity of the flame division cavity, and a waste gas high-temperature treatment annular cavity is formed by the limitation between the flame division cavity and the combustion cavity. There are flame division holes on the side surface of the flame division cavity, and high-temperature flames are divided through the flame division holes to form plasma fire jets; the flame division cavity is provided with a gas jet head, and the mixed gas in the gas mixing cavity is ejected through the gas jet head to form a swirling flow of the mixed gas that is guided annularly from top to bottom along the annular structure of the waste gas high-temperature treatment annular cavity; the plasma fire jets and the swirling flow of the mixed gas impinge on each other in the waste gas high-temperature treatment annular cavity. The present invention combines the division of plasma flames and the swirl of the mixed gas, making the contact between the mixed gas and the plasma flames more thorough and sufficient, and improving the thoroughness and efficiency of the plasma high-temperature treatment of waste gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of plasma waste gas treatment, and particularly relates to a plasma waste gas high-temperature treatment system with the impact of split fire and swirl flow. Background Art

[0002] In plasma waste gas treatment equipment, a plasma arc flame can treat flammable, toxic, and PFCs gases, and the treatment capacity can reach 3000 - 4000 SLM. The plasma flame is in the middle of the combustion chamber, and the mixed waste gas is introduced into the combustion chamber from top to bottom around the flame. Due to the impact and driving effect of the plasma flame, part of the mixed gas introduced into the combustion chamber is carried out of the combustion chamber and into the cooling chamber before it has time to directly contact the plasma flame. The contact between the mixed gas and the plasma flame is not sufficient, seriously affecting the effect and efficiency of the high-temperature treatment of waste gas by plasma. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a plasma waste gas high-temperature treatment system with the impact of split fire and swirl flow, which combines the split fire of the plasma flame and the swirl flow of the mixed gas, making the contact between the mixed gas and the plasma flame more thorough and sufficient, and improving the thoroughness and efficiency of the high-temperature treatment of waste gas by plasma.

[0004] Technical Solution: To achieve the above object, the plasma waste gas high-temperature treatment system with the impact of split fire and swirl flow of the present invention includes a combustion cavity and a cooling cavity vertically and coaxially docked. The combustion cavity has a plasma torch and an air inlet, and the cooling cavity has a water inlet;

[0005] A split fire cavity is coaxially arranged in the combustion cavity; a gas mixing cavity is formed by the limit between the top of the split fire cavity and the inner top of the combustion cavity, and each gas directly enters the gas mixing cavity through the air inlet and mixes; the plasma torch passes through the gas mixing cavity and extends into the split fire cavity of the split fire cavity. A waste gas high-temperature treatment annular cavity is formed by the limit between the split fire cavity and the combustion cavity. A plurality of split fire holes are evenly arranged on the side surface of the split fire cavity. The split fire cavity communicates with the waste gas high-temperature treatment annular cavity through the split fire holes. The high-temperature flame generated by the plasma torch forms a plasma fire jet that shoots into the waste gas high-temperature treatment annular cavity through each split fire hole; the split fire cavity has a jet head, the gas mixing cavity communicates with the waste gas high-temperature treatment annular cavity through the jet head, and the mixed gas in the gas mixing cavity is ejected along the circumferential direction of the waste gas high-temperature treatment annular cavity through the jet head, forming a swirl flow of the mixed gas that flows downward in a circular structure along the waste gas high-temperature treatment annular cavity; the plasma fire jet and the swirl flow of the mixed gas impact each other in the waste gas high-temperature treatment annular cavity.

[0006] Furthermore, the axial direction of the flame-dividing holes is arranged along the radial direction of the flame-dividing cavity, so that the plasma flame jets formed when the plasma flame ejects from the flame-dividing holes are in a transverse posture, and the transverse plasma flame jets impact the swirling flow of the mixed gas flowing in a circular shape from top to bottom.

[0007] Furthermore, a plurality of the flame-dividing holes are circumferentially arrayed on the side surface of the flame-dividing cavity, so that the plasma flame in the flame-dividing cavity jets into the exhaust gas high-temperature treatment annular cavity in a circumferentially divergent form through each flame-dividing hole.

[0008] Furthermore, the bottom of the flame-dividing cavity has a bottom plug, and an impact body facing the plasma torch is arranged on the plug surface of the bottom plug that faces the plasma flame. When the plasma flame ejected by the plasma torch impacts the impact body, it can diffuse from the center of the flame-dividing cavity to the periphery.

[0009] Furthermore, the impact body is composed of a circular top and a frustum of a cone that are integrally formed up and down, and the circular top and the frustum of the cone are tangentially connected at the connection part.

[0010] Furthermore, the top of the flame-dividing cavity has a flame-dividing cavity connecting plate, and the flame-dividing cavity connecting plate is connected to the top of the combustion cavity with an interval of the mixing cavity in between; the jet head is arranged on the flame-dividing cavity connecting plate, and a plurality of the jet heads are circumferentially arrayed in a circular annular profile of the exhaust gas high-temperature treatment annular cavity.

[0011] Furthermore, the jet head is a jet bent pipe, the intake end of the jet bent pipe vertically communicates with the mixing cavity, and the orientation of the outlet end of the jet bent pipe is tangentially arranged with respect to the radial direction of the exhaust gas high-temperature treatment annular cavity.

[0012] Furthermore, the top plate of the cooling cavity is butt-jointed with the bottom opening of the combustion cavity, a plurality of evenly distributed air holes are formed in the top plate, and a baffle bucket surrounding the air holes is arranged at the bottom of the top plate; the cooling cavity has a cooling sandwich cavity, the water inlet communicates with the bottom of the cooling sandwich cavity, a water diversion notch is formed between the top of the cooling sandwich cavity and the top plate, and the baffle bucket is located at the center of the combustion cavity and its air outlet end is lower than the water diversion notch; the water diverted by the water diversion notch forms an annular water curtain that keeps flowing from top to bottom to surround the mixed gas that has been treated by the plasma flame at high temperature under the baffle action of the baffle bucket.

[0013] Beneficial effects: The present invention combines the plasma flame split-fire with the swirling flow of the mixed gas. The plasma fire jet and the swirling flow of the mixed gas impact each other in the exhaust gas high-temperature treatment cavity. The axial direction of the split-fire holes is arranged along the radial direction of the split-fire cavity, so that the plasma fire jet formed when the plasma flame jets out from the split-fire holes is in a transverse posture. The plasma fire jet in the transverse posture impacts the swirling flow of the mixed gas that is annularly guided from top to bottom, that is, the direction of the plasma flame is changed. In order to fully contact with numerous plasma fire jets, the mixed gas is correspondingly changed into a swirling flow guiding form, so that the contact between the mixed gas and the plasma flame is more thorough and sufficient, avoiding the situation that part of the mixed gas is carried out of the combustion chamber before it has time to contact the flame, and improving the thoroughness and efficiency of the exhaust gas plasma high-temperature treatment. Brief Description of the Drawings

[0014] Appendix Figure 1 is the overall structural schematic diagram of the present invention;

[0015] Appendix Figure 2 is the semi-sectional structural schematic diagram of the present invention;

[0016] Appendix Figure 3 is the semi-sectional structural schematic diagram of the combustion cavity. Detailed Embodiment

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] As shown in Appendix Figure 1 , Appendix Figure 2 and Appendix Figure 3As shown, a high-temperature plasma waste gas treatment system where the split fire impacts the swirl includes a combustion cavity 1 and a cooling cavity 2 vertically and coaxially docked. The combustion cavity 1 has a plasma torch 3 and an air inlet 4, and the cooling cavity 2 has a water inlet 5. A split fire cavity 6 is coaxially arranged inside the combustion cavity 1. A gas mixing cavity 7 is formed by the limit between the top of the split fire cavity 6 and the inner top of the combustion cavity 1, and each gas directly enters the gas mixing cavity 7 through the air inlet 4 for mixing. The plasma torch 3 passes through the gas mixing cavity 7 and extends into the split fire cavity 8 of the split fire cavity 6. A high-temperature waste gas treatment annular cavity 9 is formed by the limit between the split fire cavity 6 and the combustion cavity 1. A number of split fire holes 60 are evenly arranged on the side surface of the split fire cavity 6. The split fire cavity 8 communicates with the high-temperature waste gas treatment annular cavity 9 through the split fire holes 60. The high-temperature flame generated by the plasma torch 3 is split through each split fire hole 60 to form a plasma fire jet 100 that shoots into the high-temperature waste gas treatment annular cavity 9. The split fire cavity 6 has a jet head 10. The gas mixing cavity 7 communicates with the high-temperature waste gas treatment annular cavity 9 through the jet head 10, and the mixed gas in the gas mixing cavity 7 is ejected along the circumferential direction of the high-temperature waste gas treatment annular cavity 9 through the jet head 10 to form a swirling flow 200 of the mixed gas that flows in a top-down annular structure and is annularly guided. In the present invention, the split fire of the plasma flame is combined with the swirling flow of the mixed gas. The plasma fire jet 100 and the swirling flow 200 of the mixed gas impact each other in the high-temperature waste gas treatment annular cavity 9. More specifically, the axial direction of the split fire hole 60 is arranged along the radial direction of the split fire cavity 6, so that the plasma fire jet 100 formed when the plasma flame is ejected from the split fire hole 60 is in a horizontal posture. The horizontal plasma fire jet 100 impacts the swirling flow 200 of the mixed gas that is annularly guided from top to bottom, that is, a redirection operation is performed on the plasma flame. In order to fully contact with a large number of plasma fire jets 100, the mixed gas is correspondingly changed into a swirling flow guiding form, so that the mixed gas contacts the plasma flame more thoroughly and fully, avoiding the situation where some mixed gas is taken out of the combustion chamber before it has time to contact the flame, and improving the thoroughness and efficiency of the high-temperature plasma treatment of waste gas.

[0019] More specifically, as shown in the attached Figure 2 or the attached Figure 3 figure, a number of the split fire holes 60 are arranged in a circumferential array on the side surface of the split fire cavity 6, so that the plasma flame in the split fire cavity 8 shoots into the high-temperature waste gas treatment annular cavity 9 in a circumferentially divergent form through each split fire hole 60, which can better utilize the space of the high-temperature waste gas treatment annular cavity 9, and make more, evenly distributed and extensive plasma fire jets 100 fill the high-temperature waste gas treatment annular cavity 9 more regularly and efficiently.

[0020] If the plasma flame generated by the plasma torch 3 directly impacts the plane, the effect of the flame diverging and filling the entire flame distribution cavity 8 is not good. There is a situation where the bottom flame is sufficient while the top flame is missing or insufficient, thereby affecting the distribution uniformity and force uniformity of the plasma fire jets 100 formed by the flames ejected from each flame distribution hole 60. Based on this, in the present invention, the bottom of the flame distribution cavity body 6 is provided with a bottom plug 11, and an impact body 12 facing the plasma torch 3 is arranged on the plug surface of the bottom plug 11 that faces the plasma flame. When the plasma flame ejected by the plasma torch 3 impacts the impact body 12, it can diffuse from the center of the flame distribution cavity 8 to the periphery, so that the plasma flame can fill the entire flame distribution cavity 8 as much as possible, enabling each flame distribution hole 60 to obtain the plasma flame as much as possible and with a stronger flame force. Furthermore, the distribution uniformity and force uniformity of the plasma fire jets 100 in the exhaust gas high-temperature treatment annular cavity 9 are improved, and it is further ensured that the mixed gas contacts the plasma flame more thoroughly and sufficiently.

[0021] As shown in the attached Figure 3 figure, the impact body 12 is composed of a circular top part 12.1 and a frustum part 12.2 that are integrally formed up and down, and the circular top part 12.1 and the frustum part 12.2 are tangentially connected at the connection part. The plasma flame has less resistance when impacting the circular top part 12.1, and the divergence effect will be better. Moreover, the diverged flame can continue to diffuse along the surface of the frustum part 12.2, so that the flame is better and more evenly distributed and filled in the flame distribution cavity 8.

[0022] As shown in the attached Figure 2 and attached Figure 3 figure, the top of the flame distribution cavity body 6 is provided with a flame distribution cavity connecting plate 13, and the flame distribution cavity connecting plate 13 is connected to the top of the combustion cavity body 1 with an interval of the mixing cavity 7 therebetween; the jet heads 10 are arranged on the flame distribution cavity connecting plate 13, and a plurality of the jet heads 10 are arranged in a circumferential array along the circular contour of the exhaust gas high-temperature treatment annular cavity 9. The jet head 10 is a jet bent pipe, the intake end of the jet bent pipe is vertically communicated with the mixing cavity 7, and the outlet end of the jet bent pipe is arranged tangentially to the radial direction of the exhaust gas high-temperature treatment annular cavity 9.

[0023] As shown in the attached Figure 2As described above, the top plate 14 of the cooling cavity 2 is butted against the bottom opening of the combustion cavity 1. The top plate 14 is provided with evenly distributed air holes 15, and a baffle bucket 16 that encloses the air holes 15 is arranged at the bottom of the top plate 14. The cooling cavity 2 has a cooling sandwich cavity 17. The water inlet 5 communicates with the bottom of the cooling sandwich cavity 17. There is a water diversion notch 18 between the top of the cooling sandwich cavity 17 and the top plate 14. The baffle bucket 16 is located at the center of the combustion cavity 1 and its gas outlet end is lower than the water diversion notch 18. The water diverted by the water diversion notch 18 forms an annular water curtain that keeps flowing from top to bottom under the baffle action of the baffle bucket 16 to surround the mixed gas that has been treated at high temperature by the plasma flame. During the water curtain cooling process, when the mixed gas after the plasma high-temperature treatment passes through the annular water curtain, on the one hand, it is cooled, and on the other hand, dust is removed.

[0024] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. Plasma waste gas high-temperature treatment system with the impact of flame splitting and swirling, including a vertically coaxially docked combustion cavity (1) and a cooling cavity (2). The combustion cavity (1) has a plasma torch (3) and an air inlet (4), and the cooling cavity (2) has a water inlet (5). It is characterized in that: A flame splitting cavity (6) is coaxially arranged in the combustion cavity (1); a gas mixing cavity (7) is formed by limiting between the top of the flame splitting cavity (6) and the inner top of the combustion cavity (1). Each gas directly enters the gas mixing cavity (7) through the air inlet (4) and mixes; the plasma torch (3) passes through the gas mixing cavity (7) and extends into the flame splitting cavity (8) of the flame splitting cavity (6). A waste gas high-temperature treatment annular cavity (9) is formed by limiting between the flame splitting cavity (6) and the combustion cavity (1). A number of flame splitting holes (60) are evenly arranged on the side surface of the flame splitting cavity (6). The flame splitting cavity (8) communicates with the waste gas high-temperature treatment annular cavity (9) through the flame splitting holes (60). The high-temperature flame generated by the plasma torch (3) forms a plasma fire jet (100) that shoots into the waste gas high-temperature treatment annular cavity (9) through each flame splitting hole (60); the flame splitting cavity (6) has a jet head (10). The gas mixing cavity (7) communicates with the waste gas high-temperature treatment annular cavity (9) through the jet head (10). The mixed gas in the gas mixing cavity (7) is ejected along the circumference of the waste gas high-temperature treatment annular cavity (9) through the jet head (10) to form a mixed gas swirl (200) that flows in a circular structure from top to bottom along the waste gas high-temperature treatment annular cavity (9); the plasma fire jet (100) and the mixed gas swirl (200) impact each other in the waste gas high-temperature treatment annular cavity (9).

2. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 1, characterized in that: The axial direction of the hole of the flame splitting hole (60) is opened along the radial direction of the flame splitting cavity (6), so that the plasma fire jet (100) formed when the plasma flame is ejected from the flame splitting hole (60) is in a horizontal posture, and the horizontal plasma fire jet (100) impacts the mixed gas swirl (200) flowing in a circular structure from top to bottom.

3. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 1, wherein: A number of the flame splitting holes (60) are arranged in a circumferential array on the side surface of the flame splitting cavity (6), so that the plasma flame in the flame splitting cavity (8) shoots into the waste gas high-temperature treatment annular cavity (9) in a circumferentially divergent form through each flame splitting hole (60).

4. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 1, characterized in that: The bottom of the flame splitting cavity (6) has a bottom plug (11). An impact body (12) facing the plasma torch (3) is arranged on the plug surface of the bottom plug (11) that faces the plasma flame. When the plasma flame ejected by the plasma torch (3) impacts the impact body (12), it can diffuse from the center to the periphery of the flame splitting cavity (8).

5. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 4, characterized in that: The impact body (12) is composed of a circular top (12.1) and a frustum (12.2) that are integrally formed up and down. The circular top (12.1) and the frustum (12.2) are tangentially connected at the connection.

6. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 1, characterized in that: The top of the flame dividing cavity (6) is provided with a flame dividing cavity connecting plate (13), and the flame dividing cavity connecting plate (13) is connected to the top of the combustion cavity (1) with an interval of the air mixing cavity (7) therebetween; the jet nozzles (10) are arranged on the flame dividing cavity connecting plate (13), and a plurality of the jet nozzles (10) are distributed in a circumferential array along the circular contour of the exhaust gas high-temperature treatment annular cavity (9).

7. The plasma waste gas high-temperature treatment system with the impact of flame splitting and swirl according to claim 6, characterized in that: The jet nozzle (10) is a jet bent pipe, the intake end of the jet bent pipe is vertically communicated with the air mixing cavity (7), and the orientation of the outlet end of the jet bent pipe is tangential to the radial direction of the exhaust gas high-temperature treatment annular cavity (9).

8. The plasma waste gas high-temperature treatment system with impact between flame splitting and swirl, according to claim 1, is characterized in that: The top plate (14) of the cooling cavity (2) is butt-jointed with the bottom opening of the combustion cavity (1), uniformly distributed air holes (15) are formed in the top plate (14), and a baffle hopper (16) surrounding the air holes (15) is arranged at the bottom of the top plate (14); the cooling cavity (2) has a cooling sandwich cavity (17), the water inlet (5) is communicated with the bottom of the cooling sandwich cavity (17), a water diversion notch (18) is formed between the top of the cooling sandwich cavity (17) and the top plate (14), the baffle hopper (16) is located at the center of the combustion cavity (1) and its air outlet end is lower than the water diversion notch (18); the water diverted by the water diversion notch (18) forms an annular water curtain flowing downward from top to bottom to surround the mixed gas treated by the plasma flame under the baffle action of the baffle hopper (16).

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