Membrane wall type front-rear arch for large-sized coal-fired boiler

A coal-fired boiler, front and rear arch technology, applied in the combustion chamber, combustion method, combustion equipment and other directions, can solve the problems of large difference in thermal expansion coefficient, easy cracking of the casting layer, low thermal efficiency, etc. Enhanced robustness and energy saving effect

Active Publication Date: 2014-09-10
BEIJING YINGXIANG BORI REFRACTORIES TECH CO LTD
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  • Abstract
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Problems solved by technology

However, since the tube bundle is made of metal materials, and the casting material in the casting layer is an inorganic non-metallic material, the difference in thermal expansion coefficient between the two is large, whi

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  • Membrane wall type front-rear arch for large-sized coal-fired boiler
  • Membrane wall type front-rear arch for large-sized coal-fired boiler
  • Membrane wall type front-rear arch for large-sized coal-fired boiler

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Embodiment Construction

[0027] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 , 2 As shown, the large-scale coal-fired boiler membrane wall type front and rear arches provided by the present invention include tube bundles 1 on the front and rear arches, each tube bundle 1 is arranged in parallel at equal intervals on the front and rear arches, and the tube bundles 1 are connected together by steel plates 2 to form A membrane-like wall structure. Please refer to figure 2 , the tube bundles 1 and steel plates 2 of the front and rear arches are covered with a layer of refractory cast layer 3 only on the surface close to the furnace, and the other side is not covered with the cast layer and is completely exposed. After adopting this design, the temperature of the front and rear arches c...

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Abstract

The invention discloses a membrane wall type front-rear arch for a large-sized coal-fired boiler, which comprises a plurality of boiler front-rear arch tube bundles; two adjacent tube bundles are fixedly connected through a steel plate; sides, close to the boiler furnace, of the tube bundles and the steel plates are covered with casting layers; a plurality of T-shaped dowels are arranged in the casting layers; the T-shaped dowels comprise nail heads and nail caps; the nail heads are fixedly connected onto the steel plates. The front-rear arch can prevent the casting layers from irregular fracturing and falling at a high temperature effectively, and can improve the thermal efficiency of the boiler.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a membrane wall type front and rear arches for large coal-fired boilers. Background technique [0002] The front and rear arches of large coal-fired boilers are the parts of the boiler that withstand higher temperatures. During the working process of large coal-fired boilers, the temperature of the front and rear arches often reaches above 1400 °C. Therefore, it is usually necessary to pour a refractory pouring layer on the front and rear arch tube bundles. However, since the tube bundle is made of metal material, and the casting material in the casting layer is an inorganic non-metallic material, the difference in thermal expansion coefficient between the two is relatively large, which makes the casting layer prone to cracking and falling off. In addition, the thermal efficiency of existing large-scale coal-fired boilers is still not very high, and there is still a lot of room ...

Claims

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Application Information

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IPC IPC(8): F23M5/06C04B35/66
Inventor 裴英翔
Owner BEIJING YINGXIANG BORI REFRACTORIES TECH CO LTD
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