Optimization arrangement mode of high-temperature heating surface

Abstract

The invention discloses an optimization arrangement mode of a high-temperature heating surface. The arrangement mode is suitable for the high-temperature heating surface involving a high-temperature last-stage superheater and a high-temperature last-stage reheater of a tangential firing II-type arranging coal-fired boiler; the arrangement process of a high-temperature steam system comprises the following steps that steam to be heated is led from an inlet connecting pipeline (1) of a same-level heating surface to an inlet large collecting box (2) of the same-level heating surface, and then is led from each region leading-in pipeline (3) to each inlet small collecting box (4); after being heated through a high-temperature heating surface (5), the steam enters each outlet small collecting box(6), and then is led from each region leading-out pipeline (7) to an outlet large collecting box (8); and finally, the steam is led out from an outlet connecting pipeline (9) to a next system. According to the optimization arrangement mode, the steam flow entering each region tube panel is changed, so that the side distribution characteristic of the steam of each region tube panel is matched withthe non-uniform characteristic of the flue gas side heating powder born by each region tube panel.

Description

technical field [0001] The invention relates to an optimal layout method of a high-temperature heating surface. Background technique [0002] For large coal-fired power plant boilers with type II layout, the high-temperature convective heating surface is arranged behind the panel superheater and near the furnace outlet, which are respectively high-temperature superheaters or high-temperature reheaters. Because the rotating rising flame formed by tangential combustion still has residual rotation at the exit of the furnace, the flue gas flow rate is unevenly distributed along the height and width of the furnace. For vertically arranged high-temperature superheaters and reheaters, although there are uneven velocity and temperature phenomena in the height direction of the flue gas, there is no thermal unevenness in the height direction of the vertically arranged serpentine tubes, because each tube is in the height direction It has passed both the area with high smoke temperatur...

AI Technical Summary

Problems solved by technology

However, the actual application results show that the effect of various measures to eliminate residual rotation to reduce the thermal unevenness of the flue gas side is not ideal, and to some extent also affects the clean and efficient combustion of pulverized coal in the furnace.

Images