Flue suitable for coke oven synthesis gas waste heat boiler

Abstract

The utility model discloses a flue suitable for a coke oven synthesis gas waste heat boiler, which comprises a vertically arranged flue shell, the flue shell is of a cylindrical structure, a plurality of heating surface modules are arranged in the flue shell, each heating surface module is supported in the flue shell in a sliding mode, and the heating surface modules are arranged in the flue shell. The connecting structure between the end of the heat exchange pipe of each heating surface module and the flue shell comprises a connecting arc-shaped plate, a plurality of connecting sleeves in one-to-one correspondence with the end of the heat exchange pipe of the corresponding heating surface module are welded to the connecting arc-shaped plate in a sealed mode, and the end of each heat exchange pipe in the heating surface module penetrates through the corresponding sleeve to stretch out of the flue shell. Each heat exchange pipe and the corresponding sleeve are fixed in a sealed welding mode, and the connecting arc-shaped plates and the flue shell are fixed in a sealed welding mode. The waste heat boiler flue has the advantages that the waste heat boiler flue is provided for the coke oven synthesis gas, the coke oven synthesis gas fully exchanges heat in the waste heat boiler flue, and the waste heat recovery efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat boilers, in particular to a coke oven synthesis gas waste heat boiler. Background Art

[0002] Coke oven gas is a by-product of the coking industry, and its main components are hydrogen and methane, as well as a small amount of carbon monoxide, unsaturated hydrocarbons above C2, carbon dioxide, oxygen, nitrogen, etc. There are few ways to recycle and process coke oven gas, and many coke oven plants directly discharge or burn a large amount of coke oven gas, which pollutes the atmosphere and increases greenhouse gases.

[0003] The coke oven gas is converted into coke oven synthesis gas by reforming and other methods, so that the coke oven gas can be used more efficiently, waste can be reduced, efficiency can be improved, and the environment can be protected. Therefore, it is necessary to develop a corresponding boiler suitable for recovering coke oven synthesis gas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a flue suitable for a coke oven synthesis gas waste heat boiler, which has good heat exchange efficiency, is easy to install and has a long service life.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is: it is suitable for the flue of the coke oven synthesis gas waste heat boiler, including a vertically arranged flue shell, the upper end of the flue shell is the flue gas inlet end, and the lower end of the flue shell is provided with a flue gas outlet, the flue shell adopts a cylindrical structure, and a plurality of heating surface modules are arranged in the flue shell from top to bottom at intervals, each heating surface module is supported in the flue shell by a sliding support structure, and the end of the heat exchange tube of each heating surface module passes through the flue shell, and the connection structure between the end of the heat exchange tube of each heating surface module and the flue shell includes: a connecting arc plate, and a plurality of connecting sleeves corresponding to the ends of the heat exchange tubes of the corresponding heating surface modules are sealed and welded on the connecting arc plate, and the end of each heat exchange tube in the heating surface module passes through the corresponding sleeve and extends out of the flue shell, each heat exchange tube is sealed and welded to the corresponding sleeve, and the connecting arc plate is sealed and welded to the flue shell.

[0006] Furthermore, the aforementioned flue is suitable for a coke oven synthesis gas waste heat boiler, wherein the heating surface modules arranged from top to bottom in the flue shell are, in sequence, a slag prevention pipe group module, a three-stage evaporator module, a high-temperature superheater module, a low-temperature superheater module, a second-stage evaporator module, a first-stage evaporator module, a second-stage economizer module, and a first-stage economizer module.

[0007] Furthermore, the aforementioned flue is applicable to a coke oven synthesis gas waste heat boiler, wherein the flue shell is lined with a refractory material layer.

[0008] Furthermore, in the aforementioned flue applicable to a coke oven synthesis gas waste heat boiler, the thickness of the refractory material layer gradually increases from bottom to top.

[0009] Furthermore, the aforementioned flue is suitable for a coke oven synthesis gas waste heat boiler, wherein the sliding support structure of each heating surface module includes: a pulley is arranged on the bottom bracket of the heating surface module, the pulley is supported on a support beam, the support beam is supported in the flue shell, and the bottom brackets of the heating surface module on both sides of the pulley above the support beam are recessed upward to form guide grooves, and the guide grooves are clamped on both sides of the support beam.

[0010] Furthermore, in the aforementioned flue applicable to the coke oven synthesis gas waste heat boiler, an ash hopper is arranged at the bottom of the flue shell, and the flue gas outlet is arranged on the side wall of the flue.

[0011] Furthermore, the aforementioned flue applicable to the coke oven synthesis gas waste heat boiler, wherein the flue gas inlet end is provided with an arc-shaped transition section flue for connection.

[0012] The advantages of the utility model are as follows: 1. It provides a waste heat boiler flue for coke oven synthesis gas, in which the coke oven synthesis gas fully exchanges heat with each heating surface module, and the waste heat recovery efficiency is high. 2. The heating surface module adopts a sliding support structure, which greatly facilitates installation and is also conducive to the timely expansion and deformation of the heating surface module, thereby effectively extending the service life of the waste heat boiler. 3. The cylindrical structure of the flue shell can greatly reduce flushing, thereby further extending the service life of the flue and achieving better sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a flue suitable for a coke oven synthesis gas waste heat boiler according to the utility model.

[0014] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure.

[0015] Figure 3 It is a schematic diagram of the connection structure between the end of the heat exchange tube of each heating surface module and the flue shell.

[0016] Figure 4 It is a structural schematic diagram of the sliding support structure of each heating surface module. DETAILED DESCRIPTION

[0017] The flue applicable to the coke oven synthesis gas waste heat boiler described in the utility model is further described in detail below in conjunction with the preferred embodiments.

[0018] like Figure 1As shown, the flue suitable for the coke oven synthesis gas waste heat boiler includes a vertically arranged flue shell 1, the upper end of the flue shell 1 is a flue gas inlet end, and in this embodiment, the flue gas inlet end is provided with a circular arc transition section flue 11 for connection. The lower end of the flue shell 1 is provided with a flue gas outlet 121. The bottom of the flue shell 1 is provided with an ash hopper 12, and the flue gas outlet 121 is provided on the side wall of the hopper 12.

[0019] The flue shell 1 adopts a cylindrical structure. Figure 2 As shown, the advantages of the cylindrical flue shell 1 are: it can greatly reduce flushing and achieve better sealing. The flue shell 1 is lined with a refractory material layer 101, and the thickness of the refractory material layer 101 gradually increases from bottom to top, thereby improving not only the thermal insulation performance but also the sealing performance.

[0020] Several heating surface modules are arranged from top to bottom in the flue shell 1. Specifically, the heating surface modules arranged from top to bottom in the flue shell 1 are the anti-slag pipe group module 3, the third-stage evaporator module 4, the high-temperature superheater module 5, the low-temperature superheater module 6, the second-stage evaporator module 7, the first-stage evaporator module 8, the second-stage economizer module 9, and the first-stage economizer module 10.

[0021] like Figure 3 As shown, in this embodiment, the end of the heat exchange tube 100 of each heating surface module passes through the flue shell 1, and the connection structure between the end of the heat exchange tube 100 of each heating surface module and the flue shell 1 includes: a connecting arc plate 13, on which a plurality of connecting sleeves 14 corresponding to the ends of the heat exchange tubes 100 of the corresponding heating surface modules are sealed and welded, and the end of each heat exchange tube 100 in the heating surface module passes through the corresponding sleeve 14 and extends out of the flue shell 1, and each heat exchange tube 100 is sealed and fixed to the corresponding sleeve 14, and the connecting arc plate 13 is also sealed and fixed to the flue shell 1. The above connection structure effectively ensures the seal between the end of the heat exchange tube 100 and the flue shell 1.

[0022] Each heating surface module is supported in the flue casing 1 by a sliding support structure. Figure 4 As shown, in this embodiment, the sliding support structure of each heating surface module includes: the bottom bracket of the heating surface module is provided with a pulley 15, the pulley 15 is supported on a support beam 16, the support beam 16 is supported in the flue shell 1, and the bottom brackets of the heating surface module on both sides of the pulley 15 above the support beam 16 are recessed upward to form guide grooves 17, and the guide grooves 17 are clamped on both sides of the support beam 16.

[0023] The above-mentioned sliding support structure is simple, and each heating surface module adopts the above-mentioned sliding support structure. Firstly, it greatly facilitates installation. During installation, it only needs to slide the heating surface module onto the support beam 16 at the corresponding position; secondly, the heating surface module can slide when it expands due to heat, thereby avoiding damage to the heating module due to thermal expansion and contraction.

[0024] The advantages of the utility model are as follows: 1. It provides a waste heat boiler flue for coke oven synthesis gas, in which the coke oven synthesis gas fully exchanges heat with each heating surface module, and the waste heat recovery efficiency is high. 2. The heating surface module adopts a sliding support structure, which greatly facilitates installation and is also conducive to the timely expansion and deformation of the heating surface module, thereby effectively extending the service life of the waste heat boiler. 3. The cylindrical structure of the flue shell 1 can greatly reduce flushing, thereby further extending the service life of the flue and achieving better sealing.

Claims

1. A flue suitable for a coke oven synthesis gas waste heat boiler, comprising a vertically arranged flue shell, the upper end of the flue shell being a flue gas inlet end, and the lower end of the flue shell being provided with a flue gas outlet, characterized in that: The flue shell adopts a cylindrical structure, and a plurality of heating surface modules are arranged at intervals from top to bottom in the flue shell. Each heating surface module is supported in the flue shell by a sliding support structure. The end of the heat exchange tube of each heating surface module passes through the flue shell. The connection structure between the end of the heat exchange tube of each heating surface module and the flue shell includes: a connecting arc plate, and a plurality of connecting sleeves corresponding to the ends of the heat exchange tubes of the corresponding heating surface modules are sealed and welded on the connecting arc plate. The end of each heat exchange tube in the heating surface module passes through the corresponding sleeve and extends out of the flue shell. Each heat exchange tube is sealed and welded to the corresponding sleeve, and the connecting arc plate is sealed and welded to the flue shell.

2. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 1, characterized in that: The heating surface modules arranged from top to bottom in the flue shell are, in sequence, a slag prevention pipe group module, a three-stage evaporator module, a high-temperature superheater module, a low-temperature superheater module, a second-stage evaporator module, a first-stage evaporator module, a second-stage economizer module, and a first-stage economizer module.

3. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 1, characterized in that: The flue shell is lined with a refractory material layer.

4. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 2, characterized in that: The thickness of the refractory material layer gradually increases from bottom to top.

5. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 1, characterized in that: The sliding support structure of each heating surface module includes: a pulley is arranged on the bottom bracket of the heating surface module, the pulley is supported on a support beam, the support beam is supported in the flue shell, the bottom bracket of the heating surface module on both sides of the pulley above the support beam is recessed upward to form a guide groove, and the guide groove is clamped on both sides of the support beam.

6. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 1, characterized in that: An ash hopper is arranged at the bottom of the flue shell, and the smoke outlet is arranged on the side wall of the ash hopper.

7. The flue suitable for a coke oven synthesis gas waste heat boiler according to claim 1, characterized in that: The smoke inlet end is provided with an arc-shaped transition section smoke duct for connection.

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