Efficient environment-friendly tunnel kiln

Abstract

The utility model relates to an efficient environment-friendly tunnel kiln, which belongs to the technical field of tunnel kilns and comprises a tunnel kiln body, the tunnel kiln body is divided into a preheating zone, a firing zone and a cooling zone, a plurality of denitration agent spray headers are arranged on the top and two side walls of the tunnel kiln body at the joint of the preheating zone and the firing zone, and the denitration agent spray headers are connected with spray pipes. A plurality of waste heat suction openings are formed in the top and the two side walls of the joint of the firing zone and the cooling zone, the waste heat suction openings are connected with waste heat exhaust pipes, and the waste heat exhaust pipes are connected with waste heat exhaust fans. The plurality of denitration agent spray headers are arranged at the top and on the two side walls of the tunnel kiln body at the joint of the preheating zone and the firing zone, flue gas nitric oxide can be treated in the kiln, the cost is lower, the plurality of waste heat suction openings are arranged at the top and on the two side walls at the joint of the firing zone and the cooling zone, and the waste heat of the flue gas nitric oxide can be recycled. The waste heat suction opening is connected with a waste heat exhaust fan, waste heat can be pumped out and reused, and the waste heat utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to a high-efficiency and environment-friendly tunnel kiln, belonging to the technical field of tunnel kilns. Background Art

[0002] In the process of refractory material production, tunnel kiln is used. Tunnel kiln is a modern continuous firing heat processing equipment. Due to its continuous operation, flue gas and waste heat are well utilized, with high thermal efficiency and good working conditions. It has been widely used in the refractory industry.

[0003] The flue gas denitrification of traditional tunnel kilns is carried out by exhausting the flue gas through the exhaust fan and then passing it into a denitrification tower, resulting in high processing costs and low waste heat utilization. Utility Model Content

[0004] The utility model provides a high-efficiency and environment-friendly tunnel kiln, which solves the problems in the above-mentioned background technology.

[0005] The utility model relates to a high-efficiency and environmentally friendly tunnel kiln, comprising a tunnel kiln body, which is divided into a preheating zone, a burning zone and a cooling zone in sequence from an inlet to an outlet, a plurality of smoke extraction ports are arranged on the top of the preheating zone, the smoke extraction ports are fixedly connected with a smoke extraction pipe, the smoke extraction pipe is connected with a smoke extraction fan, a plurality of cooling air jet ports are arranged on the top of the cooling zone, the cold spray seal is connected with a cooling pipe, the cooling pipe is connected with a cooling blower, a plurality of denitrification agent spray heads are arranged on the top and two side walls of the tunnel kiln body at the connection between the preheating zone and the burning zone, the denitrification agent spray heads are connected with the spray pipe, a plurality of corresponding burners are arranged on both sides of the tunnel kiln body, the burners are connected with a natural gas pipe and a combustion-supporting air pipe, the combustion-supporting air pipe is connected with a combustion-supporting fan, a plurality of waste heat exhaust ports are arranged on the top and two side walls of the junction between the burning zone and the cooling zone, the waste heat exhaust ports are connected with a waste heat exhaust pipe, and the waste heat exhaust pipe is connected with a waste heat exhaust fan.

[0006] As a preferred embodiment, a bottom exhaust pipe is provided at the bottom of the preheating zone, the bottom exhaust pipe is connected to a bottom exhaust fan, the outlet of the bottom exhaust fan is connected to the inlet of the combustion-supporting fan through a pipeline, and a bottom blast pipe is provided at the bottom of the burning zone and at the bottom of the junction of the burning zone and the cooling zone, the bottom blast pipe is connected to a bottom blower. The bottom exhaust pipe of the preheating zone can increase the air flow in the lower part of the preheating zone, so that the heat energy of the upper part of the preheating zone kiln car flows to the lower part, reducing the temperature difference, and the bottom blast pipe of the burning zone can prevent the temperature at the bottom of the kiln car from being too high, causing damage to the kiln car.

[0007] As a preferred embodiment, a plurality of air suction ports are provided on one side of the waste heat exhaust port close to the firing zone. The air suction ports are arranged on the top of the tunnel kiln body. The air suction ports are connected to return air ducts. The other end of the return air duct is connected to the inlet of the combustion-supporting fan, which can increase the recycling of heat energy and ensure the temperature of the combustion-supporting air entering the burner.

[0008] As a preferred embodiment, the multiple burners on the same side of the tunnel kiln body are arranged in a staggered manner, and the central axes of the corresponding burners on both sides are not in the same plane, thereby improving the problem of under-firing of products at the bottom of the kiln car and improving the firing quality.

[0009] As a preferred embodiment, burner mounting holes are provided on both side walls of the tunnel kiln body, and the burners are fixedly installed in the burner mounting holes.

[0010] As a preferred embodiment, inner pull steel is provided on the inner walls of both sides of the tunnel kiln body, and outer pull steel is provided on the outer walls of both sides of the tunnel kiln body, the inner pull steel and the outer pull steel are connected by a tension screw rod 1, and the upper parts of the outer pull steels on both sides are connected by a tension screw rod 2. The structure of the tunnel kiln body is more stable, and deformation of the tunnel kiln body during thermal expansion and contraction is prevented.

[0011] The utility model has the following beneficial effects:

[0012] There are multiple denitrification agent spray heads on the top and both side walls of the tunnel kiln body at the connection between the preheating zone and the firing zone, which can achieve in-kiln treatment of flue gas nitrogen oxides with lower cost, and there are multiple waste heat exhaust ports on the top and both side walls at the junction of the firing zone and the cooling zone. The waste heat exhaust ports are connected to waste heat exhaust fans, which can extract waste heat for reuse and improve the waste heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the top view structure of the utility model;

[0014] Figure 2 for Figure 1 Partial structure diagram Figure 1 ;

[0015] Figure 3 for Figure 1 Partial structure diagram Figure 2 ;

[0016] Figure 4 for Figure 1 Partial structure diagram Figure 3 ;

[0017] Figure 5 It is a side cross-sectional structural diagram of the firing zone of the tunnel kiln body;

[0018] In the figure: 1. Smoke extraction pipe; 2. Bottom exhaust pipe; 3. Preheating zone; 4. Denitrification agent spray head; 5. Firing zone; 6. Burner; 7. Bottom blast pipe; 8. Waste heat exhaust pipe; 9. Cooling zone; 10. Cooling pipe; 11. Cooling blower; 12. Bottom blower; 13. Waste heat exhaust fan; 14. Return air pipe; 15. Combustion-supporting fan; 16. Bottom exhaust fan; 17. Smoke extraction fan; 18. Externally pulled steel; 19. Burner mounting hole; 20. Two tension screws; 21. One tension screw; 22. Internally pulled steel. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with embodiments.

[0020] Embodiment 1, as Figures 1 to 5 As shown, the utility model is a high-efficiency and environmentally friendly tunnel kiln, including a tunnel kiln body, which is divided into a preheating zone 3, a firing zone 5 and a cooling zone 9 in sequence from the inlet to the outlet. The top of the preheating zone 3 is provided with a plurality of smoke extraction ports, the smoke extraction ports are fixedly connected with a smoke extraction pipe 1, the smoke extraction pipe 1 is connected with a smoke extraction fan 17, the top of the cooling zone 9 is provided with a plurality of cooling air jet ports, the cold spray sealing port is connected with a cooling pipe 10, the cooling pipe 10 is connected with a cooling blower 11, the connection between the preheating zone 3 and the firing zone 5 is A plurality of denitrification agent spray heads 4 are provided on the top and both side walls of the tunnel kiln body, the denitrification agent spray heads 4 are connected to spray pipes, a plurality of corresponding burners 6 are provided on both sides of the tunnel kiln body, the burners 6 are connected to natural gas pipes and combustion-supporting air ducts, the combustion-supporting air ducts are connected to combustion-supporting fans 15, a plurality of waste heat exhaust ports are provided on the top and both side walls of the junction of the firing zone 5 and the cooling zone 9, the waste heat exhaust ports are connected to waste heat exhaust ducts 8, and the waste heat exhaust ducts 8 are connected to waste heat exhaust fans 13.

[0021] During operation, the kiln car carrying the bricks enters from the inlet end of the tunnel kiln body, then enters the preheating zone 3 for preheating, then enters the firing zone 5 for sintering, and then enters the cooling zone 9 for cooling and is discharged from the outlet. In this process, the smoke exhaust fan 17 will draw the smoke in the firing zone 5 into the smoke exhaust port of the preheating zone 3, and when the smoke passes through the position of the denitrification agent spray head 4, it is sprayed with the denitrification agent sprayed by the denitrification agent spray head 4 for denitrification, and then the denitrified smoke enters the smoke exhaust fan 17 from the smoke pipe 1, and the waste heat exhaust fan 13 will extract heat energy from the waste heat exhaust port, and then transport it to the brick drying room or heat exchanger for heat exchange and heating.

[0022] Embodiment 2, on the basis of embodiment 1, a bottom exhaust pipe 2 is provided at the bottom of the preheating zone 3, a plurality of exhaust ports are evenly arranged along the axial direction, a bottom exhaust fan 16 is connected to the bottom exhaust pipe 2, the outlet of the bottom exhaust fan 16 is connected to the inlet of the combustion-supporting fan 15 through a pipeline, a bottom blast pipe 7 is provided at the bottom of the burning zone 5 and the bottom of the junction of the burning zone 5 and the cooling zone 9, a plurality of blast ports are evenly arranged along the axial direction at the top of the bottom blast pipe 7, and a bottom blast fan 12 is connected to the bottom blast pipe 7. When working, the bottom exhaust fan 16 will start, extract the air from the lower part of the kiln car of the preheating zone 3 through the bottom exhaust pipe 2, and then send it to the combustion-supporting fan 15 for recycling, and increase the air flow in the preheating zone 3, reducing the temperature difference between the upper and lower parts. The bottom blast pipe 7 will also start to blow air to the bottom of the burning zone 5, so that the temperature at the bottom of the kiln car will not be too high, the pressure will be more balanced, and the kiln car will be protected.

[0023] The effective height of the tunnel kiln body is 2092mm, the width inside the kiln is 2180mm, and the aspect ratio is about 1.04, which breaks the current flat kiln design concept. It increases the brick loading capacity of the kiln car and improves the firing output, thus effectively reducing the energy consumption per ton of bricks.

[0024] A plurality of air suction ports are provided on one side of the waste heat exhaust port close to the burning zone 5 . The air suction ports are arranged on the top of the tunnel kiln body. The air suction ports are connected to a return air duct 14 , and the other end of the return air duct 14 is connected to the inlet of a combustion-supporting fan 15 .

[0025] The multiple burners 6 on the same side of the tunnel kiln body are arranged in a staggered manner, and the central axes of the corresponding burners 6 on both sides are not in the same plane. The kiln wall refractory material of the tunnel kiln body around the denitrification agent spray head 4 is selected to be resistant to ammonia corrosion. The tunnel kiln body is designed with a working layer and lightweight insulation bricks, and the outermost layer is laid with insulation cotton to reduce heat loss.

[0026] Burner mounting holes 19 are provided on both side walls of the tunnel kiln body, and the burner nozzles 6 are fixedly installed in the burner mounting holes 19 .

[0027] Inner pull steel 22 is provided on the inner walls on both sides of the tunnel kiln body, and outer pull steel 18 is provided on the outer walls on both sides of the tunnel kiln body. The inner pull steel 22 and the outer pull steel 18 are connected by a tension screw 21, and the upper parts of the outer pull steel 18 on both sides are connected by a tension screw 20.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0029] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A high-efficiency and environmentally friendly tunnel kiln, comprising a tunnel kiln body, the tunnel kiln body being divided into a preheating zone (3), a firing zone (5) and a cooling zone (9) in sequence from the inlet to the outlet, a plurality of smoke extraction ports being provided at the top of the preheating zone (3), a smoke extraction pipe (1) being fixedly connected to the smoke extraction port, a smoke extraction fan (17) being connected to the smoke extraction pipe (1), a plurality of cooling air jet ports being provided at the top of the cooling zone (9), a cooling air jet sealing port being connected to a cooling pipe (10), a cooling air blower (11) being connected to the cooling air blower (11), characterized in that: A plurality of denitrification agent spray heads (4) are provided on the top and both side walls of the tunnel kiln body at the connection between the preheating zone (3) and the firing zone (5), and the denitrification agent spray heads (4) are connected to spray pipes. A plurality of corresponding burners (6) are provided on both sides of the tunnel kiln body, and the burners (6) are connected to natural gas pipes and combustion-supporting air ducts, and the combustion-supporting air ducts are connected to combustion-supporting fans (15). A plurality of waste heat exhaust ports are provided on the top and both side walls of the junction between the firing zone (5) and the cooling zone (9), and the waste heat exhaust ports are connected to waste heat exhaust ducts (8), and the waste heat exhaust ducts (8) are connected to waste heat exhaust fans (13).

2. The high-efficiency and environmentally friendly tunnel kiln according to claim 1, characterized in that: A bottom exhaust pipe (2) is provided at the bottom of the preheating zone (3), the bottom exhaust pipe (2) is connected to a bottom exhaust fan (16), the outlet of the bottom exhaust fan (16) is connected to the inlet of a combustion-supporting fan (15) via a pipeline, and a bottom blast pipe (7) is provided at the bottom of the burning zone (5) and at the bottom of the junction of the burning zone (5) and the cooling zone (9), the bottom blast pipe (7) is connected to a bottom blower (12).

3. The high-efficiency and environmentally friendly tunnel kiln according to claim 2, characterized in that: A plurality of air suction ports are provided on one side of the waste heat exhaust port close to the burning zone (5), the air suction ports are arranged on the top of the tunnel kiln body, the air suction ports are connected to return air ducts (14), and the other end of the return air duct (14) is connected to the inlet of the combustion-supporting fan (15).

4. The high-efficiency and environmentally friendly tunnel kiln according to claim 1, characterized in that: The plurality of burner nozzles (6) on the same side of the tunnel kiln body are arranged in a staggered manner, and the central axes of the corresponding burner nozzles (6) on both sides are not in the same plane.

5. The high-efficiency and environmentally friendly tunnel kiln according to claim 4, characterized in that: Burner mounting holes (19) are provided on both side walls of the tunnel kiln body, and the burner nozzles (6) are fixedly mounted in the burner mounting holes (19).

6. The high-efficiency and environmentally friendly tunnel kiln according to claim 1, characterized in that: Inner pull steel (22) is provided on the inner walls of both sides of the tunnel kiln body, and outer pull steel (18) is provided on the outer walls of both sides of the tunnel kiln body. The inner pull steel (22) and the outer pull steel (18) are connected by a first tension screw (21), and the upper parts of the outer pull steel (18) on both sides are connected by a second tension screw (20).

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