WO2011063610A1

WO2011063610A1 - Anti-wear structure at the joint of coal supply pipe and furnace

Info

Publication number: WO2011063610A1
Application number: PCT/CN2010/001893
Authority: WO
Inventors: 刘义; 刘建斌; 尹双林; 胡明旺
Original assignee: 上海锅炉厂有限公司
Priority date: 2009-11-30
Filing date: 2010-11-26
Publication date: 2011-06-03
Also published as: ZA201105411B; TR201107694T1; CN201547802U

Abstract

An anti-wear structure at the joint of a coal supply pipe and a furnace comprises an anti-wear fireproof material layer (3) and a metallic anti-wear pipe (5). The anti-wear fireproof material layer (3) is built on the inner wall of the coal supply pipe (1) and entirely extends into the furnace (8) from the fuel inlet port of the coal supply pipe (1). The anti-wear fireproof material layer (3) located inside the furnace (8) surrounds water wall tubes (2). The metallic anti-wear pipe (5) is provided on the inner wall of the anti-wear fireproof material layer (3) and extends to the opening of the furnace (8) from the fuel inlet port of the coal supply pipe (1). The anti-wear structure effectively enhances the anti-wear intensity of the materials at the joint of the coal supply pipe and the furnace and prevents the materials from being worn.

Description

Wear-resistant structure at the interface between coal feeding tube and furnace

The invention relates to a wear-resistant structure at the interface between the coal pipe and the furnace, in particular to a wear-resistant structure suitable for the interface between the coal feed pipe and the furnace in the circulating fluidized bed boiler (CFB), belonging to a circulating fluidized bed Boiler technology field. Background technique

In the interface between the coal feeding pipe and the furnace in the circulating fluidized bed boiler, in order to protect the water wall pipe from the direct impact of the fuel particles, it is necessary to build a wear resistant material. Because of the effect of the gravity of the coal pipe here, the wear-resistant material of the masonry is affected by the internal stress, the masonry condition is worse than other parts in the furnace, and the wear-resistant material of the masonry is simultaneously subjected to the downward direction of the coal pipe at high temperature. The impact of the fuel particles and the upward fluidized material in the furnace makes the wear-resistant material here more susceptible to damage, thereby losing the protection of the water-cooled wall tube.

In the current prior art, in order to protect the water wall tube at the interface between the coal pipe and the furnace from direct impact and wear of the fuel particles, a convex refractory material is formed at the interface between the coal pipe and the furnace to form a convexity. It is hoped that it will not be easily damaged by increasing the thickness of the wear resistant material. However, the use of such a solution does not substantially enhance the wear resistance of the wear resistant material herein, and can be considered as merely increasing the margin of the wear layer, and the presence of the boss is also liable to cause the coal pipe The reduction of the internal fuel passage space is prone to the phenomenon that the coal is not smooth and the coal pipe is blocked. Disclosure of invention

The object of the present invention is to provide a wear-resistant structure at the interface between the coal pipe and the furnace, and the wear resistance is effectively enhanced, and the problem that the wear-resistant material at the interface between the coal pipe and the furnace in the circulating fluidized bed boiler is easily worn is solved.

In order to achieve the above object, the technical solution of the present invention provides a wear-resistant structure at the interface between the coal pipe and the furnace, which comprises a wear-resistant refractory layer and a metal wear-resistant pipe, and is characterized by:

The wear-resistant refractory material layer is built on the inner wall of the coal feeding pipe, and is integrally extended from the fuel inlet of the coal feeding pipe into the furnace, and the wear-resistant refractory material layer in the furnace is coated with the water-cooling wall pipe;

1

Confirmation The metal wear tube is disposed on the inner wall of the wear resistant refractory layer and extends from the fuel inlet of the coal feed tube to the opening of the furnace.

The wear resistant refractory layer has a thickness of 30 to 300 mm.

Further, the wear-resistant structure at the interface between the coal feeding tube and the furnace of the present invention further comprises a refractory insulating material layer cast between the inner wall of the coal feeding tube and the outer wall of the wear-resistant refractory layer, the fuel of the coal feeding tube The entrance is extended to the opening of the furnace.

The refractory insulating material layer has a thickness of 20 to 200 mm.

A plurality of first metal pins are disposed on the inner wall of the coal feeding pipe, and the first metal pin connects and fixes the wear-resistant refractory material layer, the refractory heat insulating material layer and the coal feeding pipe.

A plurality of second metal pins are disposed on a side of the water wall tube facing the furnace, and the second metal pin connects and fixes the wear resistant refractory layer and the water wall tube.

The wear-resistant structure at the interface between the coal feeding tube and the furnace provided by the invention has the following advantages compared with the prior art:

1. The metal wear-resistant tube is used as the inner lining of the whole wear-resistant structure. Under normal use, the high-temperature and high-density fuel particles only scouring and wearing the metal wear-resistant tube when passing through the channel of the coal feeding tube, ensuring The coal pipe is unobstructed and no coal plugging occurs. At the same time, if the metal wear-resistant tube is worn out during the routine maintenance of the equipment, only the metal wear-resistant tube can be replaced, saving maintenance costs and maintenance time.

2. A wear-resistant refractory layer is arranged under the metal wear-resistant tube. When the metal wear-resistant tube is not properly damaged due to excessive wear, the wear-resistant refractory layer acts as a second wear protection layer to protect the coal pipe and The water wall tube is not directly washed by high temperature and high density fuel particles.

3. The wear-resistant refractory material layer extending from the fuel inlet of the coal feeding pipe to the furnace is integrally built. There is no working seam formed by the original separate masonry, which effectively improves the resistance of the wear-resistant refractory layer 3. Grinding strength, reliable quality and long service life.

The wear-resistant structure at the interface between the coal feeding tube and the furnace provided by the invention effectively enhances the wear resistance, and solves the problem that the wear-resistant material at the interface between the coal feeding tube and the furnace in the circulating fluidized bed boiler is easy to wear. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic view of the wear resistant structure at the interface between the coal feeding tube and the furnace provided by the present invention. The best way to implement the invention Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic diagram of the wear-resistant structure at the interface between the coal feeding tube and the furnace provided by the present invention. At the interface between the coal feeding pipe 1 and the furnace 8, the water wall pipe 2 is opened to the coal pipe opening through the jump pipe, thereby forming a passage for the fuel pipe 1 to enter the furnace 8 of the fuel pipe 1.

The wear-resistant structure at the interface between the coal feeding pipe and the furnace includes a wear-resistant refractory material layer 3 laid on the inner wall of the coal feeding pipe 1, which is extended from the fuel inlet of the coal feeding pipe 1 into the furnace 8 The wear-resistant refractory layer 3 located in the furnace 8 coats the water-cooled wall pipe 2; not only effectively prevents the water-cooled wall pipe 2 at the interface between the coal pipe 1 and the furnace 8 from being directly washed and worn by the granules, and Since the wear-resistant refractory material layer 3 is integrally built into the furnace 8 from the fuel inlet of the coal feeding pipe 1, the primary wear-resistant refractory material layer 3 has no working seam, and the wear-resistant refractory material layer 3 is prevented from working seams. The cause is insufficient strength, which affects the service life.

The thickness of the wear-resistant refractory material layer 3 of the masonry is 30 to 300 mm in combination with the actual boiler condition. The «" grinding refractory material layer 3 adopts a casting material with good wear resistance, and the anti-wear coefficient generally requires less than 8 cm ³ , which means that the material loss of the wear-resistant material is less than 8 cm under the standard specified abrasion test condition. ³ o

The wear-resistant structure at the interface between the coal feeding tube and the furnace further comprises a metal wear-resistant tube 5 disposed on the inner wall of the wear-resistant refractory material layer 3 as a lining of the entire wear-resistant structure, which is fueled by the coal feeding tube 1. The entrance extends to the opening of the furnace 8 .

Further, in order to prevent overheating of the coal pipe 1, the wear resistant structure of the present invention further comprises a refractory insulating material layer 4 cast between the inner wall of the coal feeding pipe 1 and the outer wall of the wear resistant refractory material layer 3, which is fed coal. The fuel inlet of the tube 1 is extended to the furnace opening. In combination with the actual boiler condition, the thickness of the cast refractory insulating material layer 4 is 20 to 200 mm, which can effectively reduce the heat loss of the coal pipe 1.

On the inner wall of the coal feeding pipe 1, a plurality of first metal pins 6 are provided for connecting and fixing the wear-resistant and fire-resistant material layer 3, the refractory heat insulating material layer 4 and the coal feeding pipe 1.

On the side of the water wall tube 2 facing the inside of the furnace 8, a plurality of second metal pins 7 are provided for connecting and fixing the wear resistant refractory material layer 3 and the water wall tube 2.

The function of the first metal pin 6 and the second metal pin 7 is to further securely set the wear resistant refractory layer 3 to improve its service life.

The wear-resistant structure at the interface between the coal feeding tube and the furnace provided by the invention has the following advantages compared with the prior art: 1. The metal wear-resistant tube is used as the inner lining of the wear-resistant joint. Under normal use conditions, the high-temperature and high-density fuel particles only scouring and wearing the metal wear-resistant tube when passing through the channel of the coal feeding tube, ensuring The coal pipe is unobstructed and no coal plugging occurs. At the same time, if the metal wear-resistant tube is excessively worn during the routine maintenance of the equipment, only the metal wear-resistant tube can be replaced, thereby saving maintenance costs and maintenance time.

• The wear-resistant structure at the interface between the coal feeding tube and the furnace provided by the invention effectively enhances the wear resistance, and solves the problem that the wear-resistant material at the interface between the coal feeding tube and the furnace in the circulating fluidized bed boiler is easily worn.

Although the present invention has been described in detail by the preferred embodiments thereof, it should be understood that the description is not to be construed as limiting. Various modifications and alterations of the present invention will be apparent to those skilled in the art. Therefore, the scope of the invention should be limited by the appended claims.

Claims

Rights request

1. A wear-resistant structure at the interface between the coal pipe and the furnace, characterized in that it comprises a wear-resistant refractory layer

(3) and metal wear-resistant tubes (5);

The wear-resistant refractory layer (3) is built on the inner wall of the coal feeding pipe (1), and is integrally extended from the fuel inlet of the coal feeding pipe (1) into the furnace (8), located in the furnace ( 8) Wear-resistant refractory layer (3) inside the water-cooled wall tube (2);

The metal wear-resistant tube (5) is disposed on the inner wall of the wear-resistant refractory layer (3), which extends from the fuel inlet of the coal feed pipe (1) to the opening of the furnace (8).

2. The wear-resistant structure at the interface between the coal feeding tube and the furnace according to claim 1, wherein the wear-resistant refractory material layer (3) has a thickness of 30 to 300 mm.

3. The wear resistant structure at the interface between the coal feed pipe and the furnace according to claim 1, further comprising pouring between the inner wall of the coal feed pipe (1) and the outer wall of the wear resistant refractory material layer (3) The refractory insulation layer (4) is cast from the fuel inlet of the coal feed pipe (1) to the furnace opening.

4. The wear-resistant structure at the interface between the coal feeding tube and the furnace according to claim 3, wherein the refractory insulating material layer (4) has a thickness of 20 to 200 mm.

5. The wear-resistant structure at the interface between the coal feed pipe and the furnace according to claim 3, wherein a plurality of first metal pins (6) are provided on an inner wall of the coal feed pipe (1), First metal pin

(6) Connecting and fixing the wear-resistant refractory material layer (3), the refractory heat insulating material layer (4) and the coal feeding pipe (1).

6. The wear resistant structure at the interface between the coal feed tube and the furnace according to claim 1, wherein said water wall tube

(2) on the side facing the furnace (8), a plurality of second metal pins (7) are provided, the second metal pins (7) facing the wear-resistant refractory layer (3) and the water-cooled wall tube ( 2) The connection is fixed.