Novel energy-saving kiln tail burner

Abstract

A novel energy-saving kiln tail burner comprises a spray head, a spray pipe and a protective sleeve, the spray head and the spray pipe are integrally connected, the protective sleeve is arranged on the outer sides of the spray head and the spray pipe in a sleeving mode, and a heat insulation layer is arranged between the protective sleeve and the spray pipe. The nozzle comprises a flow expanding section and an outlet section which are sequentially connected outwards in the axial direction of the spray pipe, the flow expanding section is a conical pipe, the small-pipe-diameter end of the flow expanding section is connected with the spray pipe, the large-pipe-diameter end of the flow expanding section is connected with the outlet section, the spray pipe extends through the flow expanding section, the pipe diameter of the flow expanding section is expanded, fuel is fully mixed with oxygen in the flow expanding section, and therefore the fuel is fully combusted; flow deflectors are arranged in the outlet section and evenly distributed in the circumferential direction of the inner wall of the outlet section at intervals. And the fuel can be fully combusted, so that the fuel consumption is reduced, and an energy-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement calcining equipment technical field, concretely relates to a novel energy -conserving kiln tail combustor. BACKGROUND

[0002] In the cement production process, need to use cement kiln to carry out production, usually the material (such as limestone, clay and other raw materials) in cement kiln is heated to high temperature and melts together, this process is called calcination. After calcination, the material is cooled and broken into small pieces, then ground into fine powder, finally made into cement.

[0003] In the cement kiln production process, generally use coal powder combustor to burn coal powder to provide heat to the cement kiln, but the coal powder combustor of the present coal powder mixes unevenly, and the coal powder is not fully combusted, so further improvement is needed. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems and deficiencies in the prior art, the utility model provides a novel energy -conserving kiln tail combustor.

[0005] The utility model technical scheme is as follows:

[0006] A novel energy -conserving kiln tail combustor, including spray head, spray pipe and sheath, spray head and spray pipe integral connection, sheath is set outside spray head and spray pipe, and is equipped with heat insulating layer between sheath and spray pipe.

[0007] Specifically, spray head and spray pipe are connected together by welding. One end of the spray pipe is provided with a coal pipe connecting flange for connecting with the coal pipe. The middle part of the spray pipe is provided with a spray pipe flange. The end of the sheath towards the coal pipe flange is provided with a sheath flange. The sheath flange is used to connect with the spray pipe flange, so that the sheath is sleeved outside the spray pipe and is detachably connected with the spray pipe through the sheath flange. This facilitates the installation, disassembly and replacement of the sheath for maintenance operations. In addition, a heat insulating layer is provided between the sheath and the spray pipe. The heat insulating layer can be made of rock wool to achieve heat insulation, reduce heat loss inside the spray pipe and improve the efficiency of the combustor, thereby achieving energy saving.

[0008] The spray head includes a diffuser section and an outlet section connected in sequence along the axial direction of the spray pipe. The diffuser section is a conical pipe with one end connected to the spray pipe and the other end connected to the outlet section. The diffuser section extends the spray pipe and increases the pipe diameter, allowing the fuel to mix with oxygen sufficiently in the diffuser section, thereby allowing the fuel to burn fully. In addition, the outlet section is provided with guide vanes, which are arranged in a circumferential direction along the inner wall of the outlet section. This allows the flame to be concentrated and ejected, increases the ejection speed of the flame, and concentrates the energy of the flame, thereby reducing heat loss caused by heat overflow.

[0009] According to one specific embodiment, the outlet section is a circular tube, and the tube diameter is equal to that of the diffuser section. The purpose is to improve the concentration of the jet flame.

[0010] According to one specific embodiment, the cone angle of the diffuser section is 13°-15°, preferably 13°-14°.

[0011] According to one specific embodiment, the length ratio of the diffuser section to the outlet section is 1.25-2. Preferably, it is 1.3-1.5.

[0012] According to one specific embodiment, the guide vane is a spiral guide vane. The spiral wind is formed by the spiral guide vane, so that the fuel and oxygen are fully mixed in the nozzle, and the fuel is fully burned.

[0013] Further, for the convenience of functional effect and manufacturing cost, preferably, five guide vanes are arranged at intervals.

[0014] According to one specific embodiment, the sheath is sleeved on part of the nozzle, and the length of the sheath sleeved on the nozzle section is not less than 380 mm. This ensures that the fuel reaches the combustion temperature in the nozzle and the nozzle before the flame is sprayed out, and reduces the heat loss caused by heat exchange.

[0015] The beneficial effects of the present utility model are:

[0016] 1) The present utility model has the characteristics of simple structure, convenient use, and low manufacturing cost.

[0017] 2) The burner sheath shell is detachably connected, which facilitates installation and maintenance.

[0018] 3) The guide vanes are arranged in the air outlet section, so that the coal powder airflow is diffused outward and generates a cyclone, thereby ensuring that the coal powder is more uniformly mixed and diffused when sprayed out, fully burning the fuel, thereby reducing fuel consumption and achieving the effect of energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the front view of the embodiment;

[0020] Figure 2 It is a left view of Figure 1 ; and

[0021] 1, nozzle; 11, diffuser section; 12, outlet section; 13, guide vane; 2, nozzle; 3, sheath; 4, rock wool; 5, sheath flange; 6, nozzle flange; 7, sealing element; 8, coal pipe connecting flange. DETAILED DESCRIPTION

[0022] The technical means adopted to achieve the predetermined invention purpose of the present utility model will be further described below in combination with the drawings in the embodiment of the present utility model.

[0023] Referring to Figure 1 and Figure 2 As shown in the figure, a new energy-saving kiln tail burner includes a spray head 1, a spray pipe 2 and a sheath 3, the spray head 1 is integrally connected with the spray pipe 2, the sheath 3 is sleeved outside the spray head 1 and the spray pipe 2, and an insulating layer is arranged between the sheath 3 and the spray pipe 2.

[0024] Specifically, the spray head 1 and the spray pipe 2 are connected together by welding. One end of the spray pipe 2 is provided with a coal pipe connecting flange 8 for connecting with a coal pipe. A spray pipe flange 6 is arranged in the middle of the spray pipe 2. One end of the sheath 3 towards the coal pipe flange is provided with a sheath flange 5 for connecting with the spray pipe flange 6, so that the sheath 3 is sleeved outside the spray pipe 2 and detachably connected with the spray pipe 2 through the sheath flange 5. This facilitates the installation, dismounting and replacement of the sheath 3 and other maintenance operations. In addition, an insulating layer is arranged between the sheath 3 and the spray pipe 2. The insulating layer can be made of rock wool 4 to play an insulating role, reduce the heat loss inside the spray pipe 2 and improve the efficiency of the burner, thereby achieving the purpose of energy saving.

[0025] The spray head 1 includes a diffuser section 11 and an outlet section 12 connected in sequence along the axial direction of the spray pipe 2. The diffuser section 11 is a conical pipe, one end with a small diameter is connected with the spray pipe 2, and the other end with a large diameter is connected with the outlet section 12. The diffuser section 11 extends the spray pipe 2 and enlarges the pipe diameter, so that the fuel is fully mixed with oxygen in the diffuser section 11, thereby making the fuel fully burn. In addition, guide vanes 13 are arranged in the outlet section 12 and are evenly distributed along the inner wall of the outlet section 12 in the circumferential direction, so that the flame can be concentratedly sprayed out and the spraying speed of the flame is improved, the energy of the flame is more concentrated, thereby reducing the heat loss caused by heat overflow.

[0026] According to a specific embodiment, the outlet section 12 is a circular pipe with a diameter equal to that of the diffuser section 11. The purpose is to improve the concentration of the sprayed flame.

[0027] In order to improve the mixing degree of the mixed fuel, the taper angle of the diffuser section 11 is 13°-15°, preferably 13°-14°.

[0028] Further, the length ratio of the diffuser section 11 to the outlet section 12 is 1.25-2. Preferably, the length ratio is 1.3-1.5. In a specific embodiment, the length ratio of the diffuser section 11 to the outlet section 12 is 1.47.

[0029] According to a specific embodiment, the guide vanes 13 are spiral guide vanes 13. The spiral guide vanes 13 form a spiral wind, so that the fuel and oxygen are fully mixed in the nozzle, thereby making the fuel fully burn.

[0030] Further, from the functional effect and the manufacturing cost, five pieces of the guide vanes 13 are preferably arranged at intervals.

[0031] According to a specific embodiment, the sheath 3 is sleeved on the part of the nozzle 1, which extends to the joint of the outlet section 12 and the diffuser section 11, or extends to the middle of the outlet section 12. The length of the nozzle 2 sleeved by the sheath 3 is not less than 380 mm, which aims to ensure the temperature in the nozzle 2. The fuel in the nozzle 2 and the nozzle reaches the combustion temperature before the flame is sprayed, and the heat loss caused by heat exchange is reduced.

[0032] The above is the preferred embodiment of the present application, but the present application is not limited to the above embodiment and example. Various changes, equivalent replacements, improvements and the like made within the knowledge range of those skilled in the art without departing from the concept of the present application should be included in the protection scope of the present application.

Claims

1. A novel energy efficient kiln tail burner characterized in that, The device comprises a nozzle (1), a spray pipe (2) and a sheath (3), the nozzle (1) is integrally connected with the spray pipe (2), the sheath (3) is sleeved outside the nozzle (1) and the spray pipe (2), and an insulating layer is arranged between the sheath (3) and the spray pipe (2); The nozzle (1) comprises a flow expansion section (11) and an outlet section (12) which are connected in sequence along the axial direction of the spray pipe (2), the flow expansion section (11) is a conical pipe, one end with a small diameter is connected with the spray pipe (2), and the other end with a large diameter is connected with the outlet section (12), the outlet section (12) is provided with a flow guide vane (13), and the flow guide vane (13) is arranged on the inner wall of the outlet section (12) in a circumferential direction.

2. The kiln tail burner of claim 1, wherein, The outlet section (12) is a circular pipe with a diameter equal to that of the flow expansion section (11).

3. The kiln tail burner of claim 2, wherein, The taper angle of the flow expansion section (11) is 13-15°.

4. The kiln tail burner of claim 3, wherein, The length ratio of the flow expansion section (11) to the outlet section (12) is 1.25-2.

5. The kiln burner according to any one of claims 1-4, characterized in that, The flow guide vane (13) is a spiral flow guide vane (13).

6. The kiln tail burner of claim 5, wherein, Five flow guide vanes (13) are arranged at intervals.

7. The kiln tail burner of claim 5, wherein, One end of the spray pipe (2) is provided with a coal pipe connecting flange (8).

8. The kiln tail burner of claim 7, wherein, A spray pipe flange (6) is arranged in the middle of the spray pipe (2), one end of the sheath (3) towards the coal pipe flange is provided with a sheath flange (5), and the sheath flange (5) is used to connect with the spray pipe flange (6).

9. The kiln tail burner of claim 8, wherein, The sheath (3) is sleeved on part of the nozzle (1) and extends to at least the joint of the outlet section (12) and the flow expansion section (11), and the length of the sheath (3) sleeved on the spray pipe (2) is not less than 380mm.

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