A waste heat boiler convection zone ash collection device

Abstract

This utility model discloses an ash collection device for the convection zone of a waste heat boiler, including a cold ash hopper. A sealing sand trough is provided above the cold ash hopper, and the two are connected by a flange. A water-cooled wall is provided at the top of the sealing sand trough, and a flexible connection is provided at the bottom of the cold ash hopper. A scraper conveyor is provided below the flexible connection, and the two are fixedly connected. This utility model increases the buffer distance for coke impact on the cold ash hopper by changing the connection method and structure between the cold ash hopper, the upper water-cooled wall, and the lower scraper conveyor, thereby preventing a large amount of coke from impacting the water-cooled fireplace tubes and the scraper conveyor chain, eliminating the risk of deformation and leakage of the water-cooled fireplace tubes or damage to the scraper conveyor. After completion, it can achieve the goal of safe and stable operation of the waste heat boiler scraper conveyor and water-cooled wall. It is easy to operate and highly practical.

Description

Technical Field

[0001] This utility model belongs to the technical field of ash collection devices, specifically relating to an ash collection device for the convection zone of a waste heat boiler. Background Technology

[0002] During the operation of the waste heat boiler, due to furnace conditions and material composition, significant coking occurs at the boiler top. This coking, upon falling, damages the inlet water-cooled wall and ash hopper of the convection zone: water-cooled wall deformation, ash hopper cracking, and scraper conveyor subsidence. Therefore, to ensure the safe and stable operation of the top-blown waste heat boiler, it is necessary to optimize the structure of the convection zone water-cooled wall, ash hopper, and scraper conveyor. Utility Model Content

[0003] This utility model provides an ash collection device for the convection zone of a waste heat boiler, which aims to solve the problem that in the existing ash hopper and water-cooled wall structure, after coke falls from the furnace top, it directly acts on the ash hopper and the scraper conveyor below the ash hopper, causing damage to the scraper conveyor and the water-cooled furnace tubes, resulting in unsafe operation of the waste heat boiler.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] A waste heat boiler convection zone ash collection device includes a cold ash hopper, a sealed sand trough is provided above the cold ash hopper and the two are connected by a flange, a water-cooled wall is provided at the top of the sealed sand trough, a flexible connection is provided at the bottom of the cold ash hopper, and a scraper conveyor is provided below the flexible connection and the two are fixedly connected.

[0006] Furthermore, the flexible connection adopts a sealing ring strip, the sealing ring strip being made of glass fiber and high-temperature refractory cotton, and the two ends of the flexible connection are connected to the cold ash hopper by bolts and pressure strips.

[0007] Furthermore, the sealing sand tank and the water-cooled wall are sealed by filling with sand and silicate coating.

[0008] Furthermore, an expansion distance of 50-80 mm is provided between the flexible connection and the scraper conveyor.

[0009] The beneficial effects of this utility model are as follows:

[0010] This utility model is mainly applied to vertical waste heat boiler systems. It changes the connection method and structure between the cold ash hopper, the upper water-cooled wall, and the lower scraper conveyor, and increases the buffer distance for coke impact on the cold ash hopper to prevent a large number of coke blocks from impacting the water-cooled fireplace tubes and scraper conveyor chains, thus eliminating the risk of deformation and leakage of the water-cooled fireplace tubes or damage to the scraper conveyor. After completion, it can achieve the goal of safe and stable operation of the waste heat boiler scraper conveyor and water-cooled wall. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram: 1-Water-cooled wall, 2-Sealed sand trough, 3-Grid screen beam, 4-Cold ash hopper, 5-Flexible connection, 6-Scraper conveyor. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0014] like Figure 1 As shown, a waste heat boiler convection zone ash collection device includes a cold ash hopper 4, a sealing sand trough 2 above the cold ash hopper 4, and the two are connected by a flange; the top of the sealing sand trough 2 is provided with a water-cooled wall 1 and a grid screen beam 3, the bottom of the cold ash hopper 4 is provided with a flexible connection 5, and a scraper conveyor 6 is provided below the flexible connection 5, and the two are fixedly connected; specifically, the flexible connection 5 adopts a sealing ring belt, and the sealing ring belt is made of glass fiber and high-temperature refractory cotton. The two ends of the flexible connection 5 are connected to the cold ash hopper 4 by bolts and pressure strips.

[0015] In addition, the sealing sand tank 2 and the water-cooled wall 1 are sealed by filling with sand and silicate coating; the flexible connection 5 and the scraper conveyor 6 are provided with an expansion distance of 50-80 mm.

[0016] This invention changes the connection between the ash hopper and the scraper conveyor and water-cooled wall to a flexible connection, and adds a screen beam at the ash hopper inlet. This prevents impact damage to the scraper conveyor and water-cooled wall caused by the ash hopper under stress, and the screen beam, connected to the steel structure of the plant, reduces the probability of coke impacting the equipment, thus improving the safe and stable operation of the waste heat boiler scraper conveyor and water-cooled wall. Furthermore, the ash hopper is made of ordinary carbon steel, facilitating maintenance in case of burn-out or cracking; and the flexible connection effectively mitigates impact during coke shedding, while also increasing its height.

Claims

1. An ash collection device for the convection zone of a waste heat boiler, characterized in that, Includes a cold ash hopper (4), with a sealing sand trough (2) above the cold ash hopper (4) and the two connected by a flange. The top of the sealing sand trough (2) is provided with a water-cooled wall (1); the bottom of the cold ash hopper (4) is provided with a scraper conveyor (6), and a flexible connection (5) is provided between the cold ash hopper (4) and the scraper conveyor (6).

2. The ash collection device for the convection zone of a waste heat boiler according to claim 1, characterized in that, The flexible connection (5) uses a sealing ring belt, and the sealing ring belt is made of glass fiber and high temperature refractory cotton. The two ends of the flexible connection (5) are connected to the cold ash hopper (4) by bolts and pressure strips.

3. The ash collection device for the convection zone of a waste heat boiler according to claim 1, characterized in that, The sealing sand tank (2) and the water-cooled wall (1) are sealed by filling with sand and silicate coating.

4. The ash collection device for the convection zone of a waste heat boiler according to claim 1, characterized in that, It also includes a grid screen beam (3), which is installed at the sealed sand trough (2) to prevent coking from falling directly onto the ash hopper.

5. The ash collection device for the convection zone of a waste heat boiler according to claim 1, characterized in that, An expansion distance of 50-80 mm is provided between the flexible connection (5) and the scraper conveyor (6).

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