Water-cooled wall of 700 DEG C twice reheating horizontal side wall opposed firing boiler and working method

Abstract

The invention discloses a water-cooled wall of a 700 DEG C twice reheating horizontal side wall opposed firing boiler and a working method. The water-cooled wall comprises a front wall, a right sidewall, a rear wall and a left side wall. By fully considering the parameter characteristics and the heat absorption distribution ratio of the 700 DEG C twice reheating boiler, perpendicular pipe ring membrane water-cooled walls are arranged on the right side wall and the left side wall, a perpendicular pipe ring once reheating membrane water-cooled wall is arranged on the front wall, and a perpendicular pipe ring twice reheating membrane water-cooled wall is arranged on the rear wall; firstly, the problems of large flow area and low flow rate of a water-cooled wall of a 700 DEG C twice reheating horizontal side wall opposed firing boiler are solved; secondly, the degree of the flow deviation of a water-cooled wall pipe is remarkably reduced, and the problem that the local over temperature of the water-cooled wall is effectively inhibited; in addition, the once reheating water-cooled wall and the twice reheating water-cooled wall are arranged, and the heating surface of the reheating radiation is increased; and the problem of the significant increase in the proportion of the heat absorption of once heating and twice heating of the 700 DEG C twice reheating boiler is effectively solved, and meanwhile, the difficult problem of arranging a wall reheating device on the horizontal side wall opposed firing boiler is avoided.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency power generation, and specifically relates to a water-cooled wall and a working method of a 700°C double-reheated horizontal sidewall-hedging boiler. Background technique [0002] 700℃ ultra-supercritical power generation technology is one of the important technical directions for efficient power generation in the future. In order to pursue higher efficiency, the United States, Japan, and Europe have successively carried out research on ultra-supercritical 700°C power generation technology since the 1980s. Since the end of the 1990s, Europe, Japan, the United States, India and other countries and regions have successively launched 700 ℃ ultra-supercritical power generation technology research programs, such as the European AD-700 and subsequent series programs, and the USC program (Ultra- SupercriticalSteam Project), Japan's A-USC program, India's Adv-USC, etc. In 1998, Europe launched t...

AI Technical Summary

Problems solved by technology

This layout method firstly solves the problem of large flow area and low flow rate of the water-cooled wall of the 700°C double-reheated horizontal side wall confronting boiler; It is relatively close, which significantly reduces the problem of flow deviation of the water-cooled wall tubes, and effectively suppresses the problem of local overheating of the water-cooled wall; in addition, the arrangement of the primary reheating water cooling wall and the secondary reheating water cooling wall increases the reheat radiation heating surface , which effectively solves the problem that the heat absorption ratio of the first reheat and the second reheat of the 700°C double reheat boiler significantly increases, and at the same time avoids the problem of arranging the wall reheater for the horizontal side wall opposed boiler

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