CN212537909U

CN212537909U - Improved water wall tube with fusion coating

Info

Publication number: CN212537909U
Application number: CN202021139228.6U
Authority: CN
Inventors: 郑伟德; 宋友亚; 丁磊; 雷中辉; 钟强; 王鹏; 付亮
Original assignee: Huaneng Hunan Yueyang Power Generation Co Ltd
Current assignee: Huaneng Hunan Yueyang Power Generation Co Ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-02-12
Anticipated expiration: 2030-06-18

Abstract

The utility model provides an improved water wall tube with a cladding layer, which comprises a water wall tube and a cladding layer; the water wall pipe is divided into a fire facing side and a back fire side; a cladding layer is laid on the fire side of the water wall pipe, and the thickness of the cladding layer is 2.5 mm; welding grooves are arranged at pipe orifices at two ends of the water wall pipe; the two ends of the water-cooled wall pipe are provided with parts which are not spliced and welded and are not deposited, so that the butt joint and welding during the pipeline installation are facilitated; the material of the water wall tube is 15CrMoG, the diameter is 28.6mm, and the thickness is 6.4 mm; 11 pieces of flat steel which is made of 15CrMoG are distributed in each group of water wall tubes at equal intervals and are welded to form a membrane type water wall tube panel, the pitch is 44.5mm, and the length is 6 meters or 2 meters. The utility model has convenient construction, the pipe panel manufacturing and deposition construction can be carried out in a workshop, and the work can be completed only by carrying out conventional pipeline welding construction on the spot; the tube panel is used for the water wall of the coal-fired boiler, and leakage accidents caused by thinning of the water wall tube due to high-temperature corrosion are effectively prevented.

Description

Improved water wall tube with fusion coating

Technical Field

The utility model particularly relates to a modified water wall tube with fusion coating.

Background

With the development of power technology, a plurality of large-capacity and high-parameter coal-fired thermal power generating units are built and put into operation successively, and the following power generating equipment also faces some problems. Wherein, the problem of high-temperature corrosion of the boiler water wall pipe troubles many coal-fired thermal power plants. Meanwhile, due to the situation of short supply and low price of the coal market and the high price of the water-rising ship, a plurality of coal-fired boilers are forced to burn non-designed coal types with higher sulfur content, the high-temperature corrosion of the water-cooled wall tubes of the boilers is further aggravated, the safe and stable operation of the unit is seriously influenced, the unsafe event of pipe explosion and shutdown caused by serious reduction of the high-temperature corrosion of the water-cooled wall tubes occurs in a plurality of power plants, the economic loss is huge, and large-area water-cooled wall tube panels have to be replaced every year.

Disclosure of Invention

To the weak point among the prior art, the utility model provides a modified water wall tube with fusion coating. The utility model has the characteristics of high temperature corrosion resistance.

In order to achieve the above purpose, the utility model discloses technical scheme as follows:

an improved water wall tube with a fused coating includes a water wall tube and a fused coating; the water wall tube is divided into a fire facing side and a back fire side; a fusion coating layer is laid on the fire side of the water wall pipe, the thickness of the fusion coating layer is 2.5mm, and stainless steel materials are adopted; welding grooves are formed in pipe orifices at two ends of the water wall pipe; the two ends of the water-cooled wall pipe are provided with parts which are not spliced and welded and are not deposited, so that the butt joint and welding during the pipeline installation are facilitated;

the water wall tube is made of 15CrMoG, the diameter of the water wall tube is 28.6mm, and the thickness of the water wall tube is 6.4 mm; and each group of 11 water wall tubes are distributed at equal intervals and spliced and welded with flat steel made of 15CrMoG to form a membrane type water wall tube panel, the pitch is 44.5mm, and the length is 6 meters or 2 meters.

Furthermore, the material that the cladding layer adopted combines closely with the material that the water wall pipe used, can prevent that the cladding layer from droing, and the tube panel deflection is little, is used for coal fired boiler water wall, can effectively prevent that the water wall pipe from causing the leakage accident because of the high temperature corrodes the attenuate. The pipe panel manufacturing and deposition construction can be carried out in a workshop, and the work can be finished only by carrying out conventional pipeline welding construction on the spot, so that the construction is convenient.

Has the advantages that: the utility model provides a modified water wall pipe with fusion coating, after boiler water wall pipe attenuate volume exceeds standard, common method is to change the tube panel, replaces according to the specification model of original water wall pipe. In order to better deal with the problem of high-temperature corrosion thinning of the water wall, a layer of stainless steel material with the thickness of 2.5mm is laid on the fire side of the original tube panel by a professional manufacturer in a fusion welding mode, and after the tube panel is replaced and operated by a novel tube panel, the inspection shows that no obvious corrosion thinning trace is seen on the surface of the tube panel, the tube panel is not obviously deformed, and the fusion welding tube panel has obvious effect of preventing the high-temperature corrosion thinning of the boiler water wall tube.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure, 1-water wall tube, 2-fused layer, 3-unfused layer, 4-welding groove.

Detailed Description

The present invention is described below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.

An improved water wall tube with a fused coating, as shown in FIG. 1, includes a water wall tube (1) and a fused coating (2); the water wall tubes (1) are distributed at equal intervals, each group of water wall tubes is unified into 11 water wall tubes, the water wall tubes and flat steel are welded to form a membrane water wall tube panel, and the water wall tubes are divided into a fire facing side and a back fire side; a layer of fusion coating (2) is laid on the fire side of the water wall tube (1), the thickness of the fusion coating is 2.5mm, stainless steel materials are adopted, the water wall tube (1) is cylindrical, the diameter is 28.6mm, and the length is 6 meters or 2 meters; the pipe orifices at the two ends of the water wall pipe (1) are provided with welding grooves (4); the two ends of the water wall pipe are provided with parts without tailor welding and fusion coatings (3), which is convenient for butt welding and welding during pipeline installation. The material used for the cladding layer (2) is tightly combined with the material used for the water wall pipe, so that the cladding layer (2) can be prevented from falling off.

The utility model discloses construction convenience, the preparation of water wall pipe and deposit the construction and can go on in the workshop, and the scene only needs to carry out conventional pipeline welding construction to it is obvious at the high temperature resistant corrosion effect of fire prevention coal boiler water wall pipe, and the tube panel deflection is little.

Claims

1. An improved water wall tube having a fusion coating, comprising: comprises a water wall tube and a cladding layer; the water wall tube is divided into a fire facing side and a back fire side; a fusion coating layer is laid on the fire side of the water wall pipe, the thickness of the fusion coating layer is 2.5mm, and stainless steel materials are adopted; welding grooves are formed in pipe orifices at two ends of the water wall pipe; the two ends of the water-cooled wall pipe are provided with parts which are not spliced and welded and are not deposited, so that the butt joint and welding during the pipeline installation are facilitated;

the water wall tube is made of 15CrMoG, the diameter of the water wall tube is 28.6mm, and the thickness of the water wall tube is 6.4 mm; 11 pieces of water wall tubes in each group are distributed at equal intervals and are welded with flat steel made of 15CrMoG in a splicing mode to form a membrane type water wall tube panel, and the pitch of the membrane type water wall tube panel is 44.5 mm.

2. The improved water wall tube with a cladding layer as recited in claim 1 wherein the cladding layer is made of a material that bonds tightly to the material used for the water wall tube to prevent the cladding layer from falling off, and wherein the tube panel has a low deflection during operation, and is used for a water wall of a coal fired boiler to prevent a leak due to thinning of the water wall tube due to high temperature corrosion.