Boiler water circulation device with middle mixing headers and pressure balance pipes

Abstract

The invention discloses a boiler water circulation device with middle mixing headers and pressure balance pipes. High-rib optimization inner thread pipe vertical pipe coils are adopted in lower hearth water walls, the outlet ends of the front wall water wall, the rear wall water wall, the left wall water wall and the right wall water wall of a lower hearth are connected with four transverse middle convergence headers of the lower hearth respectively. The four transverse middle convergence headers of the lower hearth are connected through the pressure balance pipes. Light pipe vertical pipe coils are adopted in upper hearth water cools. The inlet ends of the front wall water wall, the rear wall water wall, the left wall water wall and the right wall water wall of an upper hearth are connected with four transverse middle convergence headers of the upper hearth respectively. The four transverse middle convergence headers of the lower hearth and the four transverse middle convergence headers of the upper hearth are connected with the two vertical middle mixing headers located on the left side and the right side of a boiler through connecting pipes. High-rib optimization inner thread pipes are adopted, the increasing of flow resistance in the pipes is not large, and the heat transfer performance is enhanced. The middle is mixed sufficiently, and the situation that the outlet steam temperature deviation of the water walls of the upper hearth is likely to happen due to the outlet steam temperature deviation of the water walls of all walls of the lower hearth is prevented. By means of the pressure balance pipes, the phenomenon of flowing instability of the water walls of the lower hearth is avoided.

Description

technical field [0001] The invention relates to a steam-water circulation device and a steam-water circulation system of a super-super-superior boiler, in particular to a boiler water circulation device with an intermediate mixing header and a pressure balance pipe. Background technique [0002] The existing ultra-supercritical pulverized coal boiler water circulation system mostly adopts high-quality flow rate or low-quality flow rate. There are two main forms of high-quality flow rate water circulation system: 1. High-quality flow rate vertical tube ring water wall with orifice ring. 2. High-quality flow rate spiral tube coil water wall. These two kinds of water-cooled walls have relatively large resistance and complex structures, making installation inconvenient. The form of the water circulation system with low mass flow rate is mainly: the upper and lower furnace water walls adopt vertical pipe rings. This type of water-cooled wall often has two problems: 1. The devi...

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Problems solved by technology

This form of water wall often has two problems: 1. The deviation of the steam temperature of the water wall of the lower furnace is easy to be brought to the upper furnace, resulting in excessive steam temperature deviation at the horizontal outlet of the upper furnace

2. The problem of flow instability caused by low mass flow rate and uneven distribution of pressure drop on each wall. Flow instability means that the internal heat load disturbance of the boiler causes a large flow deviation in the water-cooled wall tube, and the flow deviation does not change over time. will keep decreasing

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