Return ash cooling system

Abstract

The utility model discloses a return ash cooling system which comprises a horizontally arranged ash cooling shell, and a cooling jacket is arranged outside the ash cooling shell. An ash inlet is formed above one end part of the ash cooling shell, an ash outlet is formed below the other end part of the ash cooling shell, a surge bin and a pneumatic conveying bin are sequentially connected below the ash outlet, a pneumatic conveying pipe is connected to the bottom of the pneumatic conveying bin, and the pneumatic conveying pipe is connected with an ash silo; two screw rods which are opposite in rotation direction and meshed with each other are mounted in the ash cooling shell, each screw rod comprises a hollow main shaft, a hollow spiral blade is mounted on a main body of each hollow main shaft, and an inner cavity for cooling water to spirally flow is formed in each hollow spiral blade. According to the return ash cooling system provided by the utility model, the cooling area of the return ash can be increased, so that the return ash is quickly cooled in a limited space, and the cooling and conveying efficiency of the return ash is improved.

Description

Technical Field

[0001] The utility model relates to a return ash cooling system and belongs to the technical field of return ash cooling. Background Art

[0002] The solid waste generated after the combustion of biomass boilers is the return ash, which needs to be transported to the ash storage through equipment. Since the return ash contains high-temperature physical heat energy, a cooling ash device is needed to cool and transport the return ash.

[0003] At present, most ash cooling devices for return ash adopt a drum structure, and water cooling heat exchange is performed through the tubes on the outer wall of the drum. This method has a small cooling area for the return ash, and the cooling and transportation efficiency are low. In order to quickly and effectively cool the return ash, the volume of the ash cooling device can only be increased. The increase in the volume of the ash cooling device will lead to an increase in energy consumption, which is not conducive to controlling production costs.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] The utility model aims at the deficiencies in the background technology and provides a return ash cooling system, which can increase the cooling area of ​​the return ash, quickly cool the return ash in a limited space, and improve the cooling and conveying efficiency of the return ash.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A return ash cooling system comprises a horizontally arranged ash cooling shell, a cooling jacket is arranged outside the ash cooling shell; an ash inlet is arranged above one end of the ash cooling shell, an ash outlet is arranged below the other end of the ash cooling shell, a buffer bin and a pneumatic conveying bin are connected in sequence below the ash outlet, a pneumatic conveying pipe is connected to the bottom of the pneumatic conveying bin, and the pneumatic conveying pipe is connected to the ash bin;

[0008] Two screws with opposite rotation directions and interlocking with each other are installed inside the cold ash shell. The screw includes a hollow main shaft. Hollow spiral blades are installed on the main body of the hollow main shaft. An inner cavity for the spiral flow of cooling water is provided inside the hollow spiral blades.

[0009] Furthermore, the cold ash shell is installed above the supporting frame.

[0010] Furthermore, a water inlet and a water return port are provided on the side of the cooling jacket, and the water inlet and the water return port are located at both ends of the cooling jacket along the length direction.

[0011] Furthermore, the ends of the two screws pass through the end wall of the cold ash shell and are installed in the bearing seat, and are rotatably supported by the bearing seat.

[0012] Furthermore, two mutually meshing transmission gears are installed on the active ends of the two screw rods, and one of the transmission gears is transmission-connected to the motor.

[0013] Furthermore, a rotary joint is installed on both the driving end and the driven end of the screw rod, and the rotary joints on the driven ends of the two screw rods are connected to the water inlet pipe through a tee.

[0014] Furthermore, the rotary joints on the active ends of the two screws are connected to the return pipe through a tee, and the cooling water after the heat exchange inside the two screws is combined into the return pipe through the tee.

[0015] Furthermore, a circular spoiler is fixedly installed in the driven end of the screw, and a water inlet hole is provided on the side of the spoiler, which connects the inner cavity of the driven end of the screw with the inner cavity of the hollow spiral blade.

[0016] Furthermore, a circular guide plate is fixedly installed in the active end of the screw, and a return hole is provided on the side of the guide plate. The return hole connects the inner cavity of the hollow spiral blade with the inner cavity of the active end of the screw.

[0017] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0018] The high-temperature return ash enters the cold ash housing and is transported horizontally under the synchronous reverse rotation of the two screws. It is cooled by two cooling water channels during the transportation process.

[0019] The first cooling water enters the cooling jacket outside the ash cooling shell, and the cooling water exchanges heat and cools the return ash during the flow. The second cooling water is divided into the hollow spiral blades of the two screws through the water inlet pipe, and the return ash exchanges heat and cools in the spiral gap. The cooling water after heat exchange merges and flows out through the return pipe;

[0020] Through the internal and external coordination of two cooling water lines, the cooling area of ​​the return ash is increased, so that the return ash can be quickly cooled in a limited space, improving the cooling efficiency, and the return ash can be efficiently transported through the synchronous reversal of the twin screws.

[0021] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the structural front view of the utility model;

[0023] Figure 2 It is a structural side view of the utility model;

[0024] Figure 3 It is a top view of the structure of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure of a twin screw.

[0026] In the figure, 1-cold ash shell, 2-support frame, 3-water inlet, 4-water return port, 5-ash inlet, 6-screw, 61-hollow main shaft, 62-hollow spiral blade, 63-baffle, 64-drainage plate, 65-water inlet hole, 66-water return hole, 7-bearing seat, 8-transmission gear, 9-motor, 10-rotating joint, 11-water inlet pipe, 12-water return pipe, 13-ash outlet, 14-buffer bin, 15-pneumatic conveying bin, 16-pneumatic conveying pipe. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0028] like Figure 1-Figure 4 As shown together, the utility model provides a return ash cooling system, comprising a horizontally arranged ash cooling shell 1 , wherein the ash cooling shell 1 is installed above a supporting frame 2 .

[0029] The outside of the cold ash shell 1 is provided with a cooling jacket, and the side of the cooling jacket is provided with a water inlet 3 and a water return port 4. The water inlet 3 and the water return port 4 are located at both ends of the cooling jacket along the length direction. The cooling jacket cools the return ash in the cold ash shell 1 from the outside.

[0030] An ash inlet 5 is provided above one end of the cold ash shell 1, and an ash outlet 13 is provided below the other end of the cold ash shell 1. A buffer bin 14 and a pneumatic conveying bin 15 are connected in sequence below the ash outlet 13. A pneumatic conveying pipe 16 is connected to the bottom of the pneumatic conveying bin 15, and the pneumatic conveying pipe 16 is connected to the ash bin.

[0031] Two screw rods 6 with opposite rotation directions and interlocking with each other are installed inside the cold ash shell 1. The ends of the two screw rods 6 pass through the end wall of the cold ash shell 1 and are installed in the bearing seat 7, which supports them for rotation.

[0032] Two mutually meshing transmission gears 8 are installed on the active ends of the two screw rods 6. The two transmission gears 8 mesh with each other to enable the two screw rods 6 to achieve synchronous reverse rotation. One of the transmission gears 8 is connected to the motor 9 for transmission, and the motor 9 provides power for the synchronous reverse rotation of the two screw rods 6.

[0033] A rotary joint 10 is installed on both the active end and the driven end of the screw 6. The rotary joints 10 on the driven ends of the two screws 6 are connected to the water inlet pipe 11 through a tee. The cooling water in the water inlet pipe 11 is diverted to the inside of the two screws 6 through the tee.

[0034] The rotary joints 10 on the active ends of the two screws 6 are connected to the return pipe 12 through a tee, and the cooling water after the heat exchange in the two screws 6 is combined into the return pipe 12 through the tee.

[0035] The screw 6 comprises a hollow main shaft 61 , on the main body of which a hollow spiral blade 62 is mounted, and inside the hollow spiral blade 62 an inner cavity for the spiral flow of cooling water is provided.

[0036] A circular spoiler 63 is fixedly installed in the driven end of the screw 6 , and a water inlet hole 65 is provided on the side of the spoiler 63 . The water inlet hole 65 connects the inner cavity of the driven end of the screw 6 with the inner cavity of the hollow spiral blade 62 .

[0037] A circular guide plate 64 is fixedly installed in the active end of the screw 6 , and a water return hole 66 is provided on the side of the guide plate 64 . The water return hole 66 connects the inner cavity of the hollow spiral blade 62 with the inner cavity of the active end of the screw 6 .

[0038] The specific working principle of this utility model:

[0039] The high-temperature return ash enters the cold ash housing 1 from the ash inlet 5 and is transported horizontally under the synchronous reverse rotation of the two screws 6. During the transportation process, it is cooled by two cooling waters.

[0040] The first cooling water enters the cooling jacket outside the cooling ash shell 1 from the water inlet 3. The cooling water exchanges heat with the return ash during the flow of the cooling jacket. The cooling water after heat exchange flows out from the return water port 4.

[0041] The second cooling water is diverted to the driven ends of the two screws 6 through the water inlet pipe 11, and enters the hollow spiral blade 62 under the action of the baffle plate 63 and the water inlet hole 65, and heat-exchanges and cools the return ash in the spiral gap. The cooling water after heat exchange enters the active ends of the two screws 6 under the action of the guide plate 64 and the return hole 66, and finally merges and flows out through the return pipe 12;

[0042] The cooled return ash enters the buffer bin 14 and the pneumatic conveying bin 15 in sequence through the ash outlet 13 under the action of gravity, and is finally transported to the ash storage through the pneumatic conveying pipe 16.

[0043] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A return ash cooling system, characterized in that: It comprises a horizontally arranged ash cooling shell (1), wherein a cooling jacket is arranged outside the ash cooling shell (1); An ash inlet (5) is provided above one end of the ash cooling shell (1), and an ash outlet (13) is provided below the other end of the ash cooling shell (1). A buffer bin (14) and a pneumatic conveying bin (15) are connected in sequence below the ash outlet (13). A pneumatic conveying pipe (16) is connected to the bottom of the pneumatic conveying bin (15), and the pneumatic conveying pipe (16) is connected to the ash bin; Two screws (6) with opposite rotation directions and interlocking with each other are installed inside the cooling ash housing (1), the screw (6) comprising a hollow main shaft (61), a hollow spiral blade (62) being installed on the main body of the hollow main shaft (61), and an inner cavity for spiral flow of cooling water is provided inside the hollow spiral blade (62).

2. A return ash cooling system according to claim 1, characterized in that: The cold ash shell (1) is installed above the supporting frame (2).

3. A return ash cooling system according to claim 1, characterized in that: A water inlet (3) and a water return port (4) are provided on the side of the cooling jacket, and the water inlet (3) and the water return port (4) are located at two ends of the cooling jacket along the length direction.

4. The return ash cooling system according to claim 1, characterized in that: The ends of the two screw rods (6) pass through the end wall of the cold ash housing (1) and are installed in the bearing seat (7), and are rotatably supported by the bearing seat (7).

5. The return ash cooling system according to claim 1, characterized in that: Two mutually meshing transmission gears (8) are mounted on the active ends of the two screw rods (6), one of the transmission gears (8) being transmission-connected to the motor (9).

6. The return ash cooling system according to claim 1, characterized in that: A rotating joint (10) is installed on both the driving end and the driven end of the screw rod (6), and the rotating joints (10) on the driven ends of the two screw rods (6) are connected to the water inlet pipe (11) through a tee.

7. A return ash cooling system as claimed in claim 6, characterized in that: The rotary joints (10) on the active ends of the two screw rods (6) are connected to the return pipe (12) via a tee, and the cooling water after the heat exchange in the two screw rods (6) is combined into the return pipe (12) via the tee.

8. The return ash cooling system according to claim 1, characterized in that: A circular spoiler (63) is fixedly installed in the driven end of the screw rod (6), and a water inlet hole (65) is provided on the side of the spoiler (63). The water inlet hole (65) connects the inner cavity of the driven end of the screw rod (6) with the inner cavity of the hollow spiral blade (62).

9. A return ash cooling system as claimed in claim 8, characterized in that: A circular guide plate (64) is fixedly installed in the active end of the screw rod (6), and a water return hole (66) is provided on the side of the guide plate (64). The water return hole (66) connects the inner cavity of the hollow spiral blade (62) with the inner cavity of the active end of the screw rod (6).

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