Air preheating system for tail hearth

Abstract

The air preheating system comprises a preheating pipe body which is detachably connected with a smoke outlet pipe, a preheating cavity is formed in the preheating pipe body, the upper end and the lower end of the preheating pipe body are respectively provided with two air inlet flanges, the outer portions of the air inlet flanges are detachably connected with an air inlet pipe, and a heat exchange pipe set is connected in the preheating cavity in a sliding mode. The heat exchange tube set comprises two mounting plates arranged side by side, the two mounting plates are connected through a plurality of heat exchange tubes, the two ends of each heat exchange tube are communicated with the two air inlet flanges respectively, an opening is formed in one side of the preheating tube body, and a first sealing flange is arranged on the portion, around the opening, of the preheating tube body. The end of the mounting plate extends to the outer side of the opening and is connected with a second sealing flange, and the first sealing flange and the second sealing flange are detachably connected. According to the utility model, the heat exchange tube can be manually disassembled, assembled and cleaned, and the heat exchange stability of the heat exchange tube is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an air preheating system, in particular to an air preheating system for a tail furnace. BACKGROUND

[0002] Since the waste incinerator will discharge the flue gas generated by incineration into the purification system for treatment during use, and at the same time needs to charge external air into the hearth to assist combustion, so that manufacturers generally install an air preheating system at the tail of the hearth to realize heat recovery and energy saving effect, that is, the air preheating system is used to preheat the air entering the hearth during the discharge of the flue gas, thereby cooling the flue gas after discharge on the one hand, and increasing the temperature of the air entering the hearth on the other hand, reducing the energy consumption of combustion.

[0003] On the basis of the above, the existing air preheating system comprises an air inlet pipe and an air outlet pipe connected with each other, the air inlet pipe and the air outlet pipe are separated from each other and are respectively used for guiding the flue gas and the air, and the flue gas flowing in the air outlet pipe will exchange heat with the air in the air inlet pipe, thereby realizing the air preheating function while ensuring the cleanliness of the air. But the defect of this structure is that since the flue gas generated by waste incineration contains a large amount of dust and fly ash, the impurities in this part will adhere to the surface of the air inlet pipe during the flow of the flue gas, thereby reducing the heat exchange efficiency. In view of this defect, for large waste incinerators, manufacturers can use a tubular air preheater to periodically remove the impurities outside the air inlet pipe; but for small waste incinerators, due to the limitation of structure and cost, it is difficult for manufacturers to realize rapid cleaning of the surface of the air inlet pipe through conventional methods, thereby reducing the preheating effect of the air.

[0004] Therefore, the existing air preheating system is difficult to realize the disassembly and cleaning of the air inlet pipe. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an air preheating system for a tail furnace. It can realize manual disassembly and cleaning of the heat exchange pipe, and improve the heat exchange stability of the heat exchange pipe.

[0006] The utility model discloses a technical scheme: an air preheating system for tail furnace, including the detachable connection flue gas outlet pipe of preheating pipe body, form preheating chamber in preheating pipe body, the upper and lower both ends of preheating pipe body are equipped with two air flange respectively, the outside detachable connection air inlet pipe of air flange, the heat exchange pipe group is slidably connected in preheating chamber, the heat exchange pipe group includes the two mounting plates of side -by -side arrangement, and the mutual connection of multiple heat exchange pipes is between two mounting plates, and the both ends of heat exchange pipe are communicated with two air flanges respectively, and one side of preheating pipe body is equipped with opening, and the preheating pipe body on the four around opening is equipped with first sealing flange, the end of mounting plate extends to the outside of opening and is connected with second sealing flange, and the detachable connection between first sealing flange and second sealing flange.

[0007] In the air preheating system for tail furnace, the heat exchange pipe and the mounting plate are connected through the adapter sleeve, and the adapter sleeve is used to make the heat exchange pipe and the mounting plate in a relative sliding state.

[0008] In the air preheating system for tail furnace, a plurality of counterbores are distributed on the mounting plate, one end of the adapter sleeve is connected in the counterbores, and the other end of the adapter sleeve passes through the counterbores and is connected with the heat exchange pipe.

[0009] In the air preheating system for tail furnace, the outer part of the mounting plate is detachably connected with the sealing plate, and the sealing plate is used to axially limit the adapter sleeve.

[0010] In the air preheating system for tail furnace, a plurality of counterbores are distributed on the mounting plate, one end of the adapter sleeve is connected in the counterbores, and the other end of the adapter sleeve passes through the counterbores and is connected with the heat exchange pipe, a limiting hole is arranged on the side wall of the adapter sleeve, a clamping screw is arranged in the limiting hole, and the end of the clamping screw passes through the limiting hole and is connected with the heat exchange pipe.

[0011] In the air preheating system for tail furnace, the front and rear ends of the preheating pipe body are connected with the flue gas outlet pipe through the air outlet flange, the air outlet flange and the air inlet flange are perpendicular to each other, and the heat exchange pipe and the air outlet flange are perpendicular to each other.

[0012] In the air preheating system for tail furnace, the outer shape of the flue gas outlet pipe is U-shaped, two preheating chambers are formed in the preheating pipe body in an upper and lower side-by-side manner, the two ends of each preheating chamber are connected with the flue gas outlet pipe through the air outlet flange, the heat exchange pipe group is connected in each preheating chamber, the two preheating chambers are communicated with each other through the intermediate pipe, and one end of each preheating chamber is communicated with the air inlet pipe through the air inlet flange.

[0013] Compared with the prior art, the utility model has the following characteristics:

[0014] (1) The utility model discloses a structure limitation to preheating pipe body makes that external air can pass through the heat exchange pipe of heat exchange pipe group middle part and flow into the hearth, and simultaneously flue gas can pass through preheating cavity from the periphery of heat exchange pipe and discharge outward, thereby realizing heat exchange function, on this basis, through the structure limitation of heat exchange pipe group, heat exchange pipe group can detachable connection on preheating pipe body, and can be taken by operating personnel, thereby when heat exchange pipe attaches a large amount of impurity, operating personnel can take out heat exchange pipe group and remove the impurity on heat exchange pipe surface, improve the preheating stability of the utility model after long -term use.

[0015] (2) Through the limitation of heat exchange pipe group installation structure, on one hand, the mutual separation of air in heat exchange pipe and flue gas in preheating cavity can be ensured, and the sealing effect inside and outside preheating cavity is ensured, on the other hand, operating personnel can directly pull out heat exchange pipe group from one side of preheating pipe body when loading and taking, that is, the hindrance of air into pipe and flue gas out of pipe is eliminated, and the operation convenience of operating personnel is ensured.

[0016] (3) Through the limitation of connecting structure between heat exchange pipe and mounting plate, the sliding connection between heat exchange pipe and mounting plate can be realized while keeping the sealing effect, thereby when heat exchange pipe forms size change under the influence of temperature, the deformation and cracking of its connecting part will not be caused, and the structural stability of the utility model is improved.

[0017] Therefore, the utility model can realize the manual dismounting and cleaning of heat exchange pipe, and improve the heat exchange stability of heat exchange pipe. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural schematic diagram of example 1.

[0019] Figure 2 It is the A direction enlarged view of Figure 1 .

[0020] Figure 3 It is the structural schematic diagram of example 2.

[0021] Figure 4 It is the B direction sectional view of Figure 3 .

[0022] The marks in the drawing are: 1-preheating pipe body, 2-preheating cavity, 3-gas inlet flange, 4-mounting plate, 5-heat exchange pipe, 6-sealing groove, 7-first sealing flange, 8-second sealing flange, 9-adapting sleeve, 10-counterbore, 11-plate, 12-tightening screw, 13-gas outlet flange, 14-intermediate pipe. DETAILED DESCRIPTION

[0023] The utility model will be further explained in connection with the drawings and examples, but not as the basis for the limitation of the utility model.

[0024] Embodiment 1. An air preheating system for a tail furnace, comprising a preheating pipe body 1 detachably connected with a flue gas outlet pipe, a preheating cavity 2 formed in the preheating pipe body 1, two air inlet flanges 3 respectively arranged at the upper and lower ends of the preheating pipe body 1, the outer portions of the air inlet flanges 3 being detachably connected with air inlet pipes, and a heat exchange pipe group slidably connected in the preheating cavity 2. Figures 1-2 The heat exchange pipe group comprises two mounting plates 4 arranged side by side, the two mounting plates 4 being connected with each other through a plurality of heat exchange pipes 5, the two ends of the heat exchange pipes 5 being respectively connected with the two air inlet flanges 3, the inner wall of the preheating pipe body 1 being buckled and connected with the mounting plates 4 through sealing grooves 6, one side of the preheating pipe body 1 being provided with an opening, and the preheating pipe body 1 around the opening being provided with a first sealing flange 7.

[0025] The mounting plates 4 are connected with the heat exchange pipes 5 through adapter sleeves 9, and the adapter sleeves 9 are used to make the mounting plates 4 and the heat exchange pipes 5 in a relative sliding state.

[0026] A plurality of counterbores 10 are distributed on the mounting plates 4, one end of the adapter sleeves 9 being buckled and connected in the counterbores 10, and the other end of the adapter sleeves 9 penetrating through the counterbores 10 and being buckled and connected with the heat exchange pipes 5.

[0027] The outer portions of the mounting plates 4 are detachably connected with sealing plates 11, the sealing plates 11 being used to axially limit the adapter sleeves 9 so that the adapter sleeves 9 are in the counterbores 10, and the sealing plates 11 being provided with circular holes for air passage.

[0028] The front and rear ends of the preheating pipe body 1 are connected with flue gas outlet pipes through air outlet flanges 13, the flue gas outlet pipes and the air outlet flanges 13 being bolted and sealed with each other through gaskets, the air outlet flanges 13 and the air inlet flanges 3 being perpendicular to each other, and the heat exchange pipes 5 and the air outlet flanges 13 being perpendicular to each other.

[0029] In use, the furnace flue gas is discharged outward from the flue gas outlet pipe and passes through the preheating cavity 2 in the process of discharge, and the external air enters the furnace through the air inlet pipes and passes through the heat exchange pipe group in the process of flow, so that the air in the heat exchange pipes 5 is preheated by the flue gas, and the functions of heat utilization and preheating are realized. When impurities are attached to the surfaces of the heat exchange pipes 5 after long-term use, the heat exchange pipe group can be pulled out through the second sealing flanges 8 after the bolts are removed, so that the surfaces of the heat exchange pipes 5 are cleaned, and the heat exchange stability is improved.

[0030] The connection structure of the adapter sleeve 9, the heat exchange pipe 5 and the mounting plate 4 is limited, so that the sliding connection between the heat exchange pipe 5 and the adapter sleeve 9 can be formed, and when the heat exchange pipe 5 is expanded and elongated due to heat, the mounting plate 4 on both sides will not be extruded, thereby ensuring the stability of the mounting plate 4 and the preheating pipe body 1, and the structural stability of the preheating pipe body 1.

[0031] Embodiment 2. An air preheating system for a tail furnace, comprising a preheating pipe body 1 detachably connected with a flue gas outlet pipe, a preheating cavity 2 formed in the preheating pipe body 1, two air inlet flanges 3 respectively arranged at the upper and lower ends of the preheating pipe body 1, the air inlet flanges 3 being detachably connected with air inlet pipes, and a heat exchange pipe group slidingly connected in the preheating cavity 2. Figures 3-4 The heat exchange pipe group comprises two mounting plates 4 arranged side by side, the two mounting plates 4 being connected with each other through a plurality of heat exchange pipes 5, the two ends of the heat exchange pipes 5 being communicated with the two air inlet flanges 3, respectively, the inner wall of the preheating pipe body 1 being detachably connected with the mounting plate 4 through a sealing groove 6, one side of the preheating pipe body 1 being provided with an opening, a first sealing flange 7 being arranged on the preheating pipe body 1 around the opening, the end of the mounting plate 4 extending to the outside of the opening and being connected with a second sealing flange 8, the first sealing flange 7 and the second sealing flange 8 being bolted and sealed with each other through a gasket.

[0032] The heat exchange pipe 5 and the mounting plate 4 are connected with each other through an adapter sleeve 9, the adapter sleeve 9 being used to make the heat exchange pipe 5 and the mounting plate 4 in a relative sliding state.

[0033] A plurality of counterbores 10 are arranged on the mounting plate 4, one end of the adapter sleeve 9 being detachably connected in the counterbores 10, the other end of the adapter sleeve 9 penetrating through the counterbores 10 and being detachably connected with the heat exchange pipe 5, a limiting hole being arranged on the side wall of the adapter sleeve 9, a set screw 12 being threadedly connected in the limiting hole, the end of the set screw 12 penetrating through the limiting hole and being detachably connected with the heat exchange pipe 5, and a long hole being arranged on the heat exchange pipe 5 to cooperate with the set screw 12.

[0034] The front and rear ends of the preheating pipe body 1 are connected with flue gas outlet pipes through air outlet flanges 13, the flue gas outlet pipes and the air outlet flanges 13 being bolted and sealed with each other through gaskets, the air outlet flanges 13 and the air inlet flanges 3 being perpendicular to each other, and the heat exchange pipes 5 and the air outlet flanges 13 being perpendicular to each other.

[0035] The flue gas outlet pipes are in a U-shaped structure, two preheating cavities 2 being arranged side by side in the preheating pipe body 1, the two ends of each preheating cavity 2 being connected with flue gas outlet pipes through air outlet flanges 13, a heat exchange pipe group being connected in each preheating cavity 2, the two preheating cavities 2 being communicated with each other through a middle pipe 14, and one end of each preheating cavity 2 being communicated with an air inlet pipe through an air inlet flange 3.

[0036] Compared with the embodiment 1, the connecting structure of the heat exchange pipe 5 and the adapter sleeve 9 is adjusted, so that the heat exchange pipe 5 can slide in the adapter sleeve 9 when it is elongated by heat, and no extrusion is formed on the mounting plate 4, which ensures the structural stability of the heat exchange pipe group.

[0037] Through the limitation of the installation structure of the flue gas outlet pipe and the preheating pipe body 1, the flue gas can also preheat the air in the preheating pipe body 1 twice when it is discharged, which further improves the preheating effect of the embodiment.

Claims

1. An air preheating system for a tail furnace, characterized by: The application relates to a preheating pipe body (1) detachably connected with flue gas outlet pipes, a preheating cavity (2) is formed in the preheating pipe body (1), two air inlet flanges (3) are arranged at the upper and lower ends of the preheating pipe body (1) respectively, air inlet pipes are detachably connected with the outer portions of the air inlet flanges (3), a heat exchange pipe group is slidably connected in the preheating cavity (2); the heat exchange pipe group comprises two mounting plates (4) arranged side by side, the two mounting plates (4) are connected with each other through a plurality of heat exchange pipes (5), the two ends of the heat exchange pipes (5) are communicated with the two air inlet flanges (3) respectively, an opening is arranged on one side of the preheating pipe body (1), a first sealing flange (7) is arranged on the preheating pipe body (1) around the opening, the end portion of the mounting plate (4) extends to the outside of the opening and is connected with a second sealing flange (8), and the first sealing flange (7) and the second sealing flange (8) are detachably connected.

2. An air preheating system for a tail furnace as claimed in claim 1, characterized in that: The heat exchange pipes (5) and the mounting plates (4) are connected with each other through adapter sleeves (9), and the adapter sleeves (9) are used for enabling the heat exchange pipes (5) and the mounting plates (4) to be in a relative sliding state.

3. An air preheating system for a tail furnace as claimed in claim 2, characterized in that: A plurality of counterbores (10) are distributed on the mounting plate (4), one end of the adapter sleeve (9) is buckled and connected in the counterbores (10), and the other end of the adapter sleeve (9) passes through the counterbores (10) and is buckled and connected with the heat exchange pipes (5).

4. An air preheating system for a tail furnace as claimed in claim 3, characterized in that: An enclosing plate (11) is detachably connected with the outer portion of the mounting plate (4), and the enclosing plate (11) is used for axially limiting the adapter sleeve (9).

5. An air preheating system for a tail furnace as claimed in claim 2, wherein: A plurality of counterbores (10) are distributed on the mounting plate (4), one end of the adapter sleeve (9) is buckled and connected in the counterbores (10), the other end of the adapter sleeve (9) passes through the counterbores (10) and is buckled and connected with the heat exchange pipes (5), a limiting hole is arranged on the side wall of the adapter sleeve (9), a clamping screw (12) is arranged in the limiting hole, and the end portion of the clamping screw (12) passes through the limiting hole and is buckled and connected with the heat exchange pipes (5).

6. An air preheating system for a tail furnace as claimed in claim 1, wherein: The front and rear ends of the preheating pipe body (1) are connected with flue gas outlet pipes through air outlet flanges (13), the air outlet flanges (13) and the air inlet flanges (3) are perpendicular to each other, and the heat exchange pipes (5) and the air outlet flanges (13) are perpendicular to each other.

7. An air preheating system for a tail furnace as claimed in claim 6, characterized in that: The outer shape of the flue gas outlet pipe is U-shaped, two preheating cavities (2) are formed in the preheating pipe body (1) in a side-by-side manner, the two ends of each preheating cavity (2) are connected with flue gas outlet pipes through air outlet flanges (13), a heat exchange pipe group is connected in each preheating cavity (2), the two preheating cavities (2) are communicated with each other through a middle pipe (14), and one end of each preheating cavity (2) is communicated with an air inlet pipe through an air inlet flange (3).

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