Cross mixed flow superheater

Abstract

The invention discloses a cross mixed flow superheater. A superheater pipe screen comprises two sets of near center pipe screens and two sets of far center pipe screens separately arranged in a boilerin the boiler width direction; the two sets of near center pipe screens and the two sets of far center pipe screens are both connected with a superheater inlet header and a superheater outlet header;the near center pipe screens and the far center pipe screens approaching each other are connected through uniform temperature pipes; and near center pipe screen return headers with higher temperatures at the middle part of a hearth and far center pipe screen return headers with lower temperatures on two sides of the hearth are across connected, so that steam flows from the near center pipe screens to the far center pipe screens or from the far center pipe screens to the near center pipe screens for mixed flowing and mixed heating. The steam temperature of superheater pipe screen outlets separately arranged in the boiler width direction reaches the same parameters, so that the working medium heat deviation caused by different arrangement position temperature fields can be effectively eliminated, the wall temperature of superheated pipe screens in high-temperature areas is lowered, and the high-temperature corrosion in the areas is relieved and improved.

Description

technical field [0001] The invention relates to a panel superheater, in particular to a high-temperature superheater used in a biomass direct-fired boiler with sub-high temperature, sub-high pressure and above parameters, belonging to the technical field of biomass direct-fired boilers. Background technique [0002] The superheater is a part in the boiler that further heats the steam from the saturated temperature to the superheated temperature, also known as the steam superheater. The superheater can be divided into convection type, radiation type and semi-radiation type according to the heat transfer mode; according to the structural characteristics, it can be divided into snake-shaped tube type, screen type, wall type and wall-wrapped type, all of which are composed of several parallel pipes and inlet and outlet Composition of headers. In the waste heat utilization system of dusty hot flue gas, the high steam superheater is the core equipment for effective use of waste h...

AI Technical Summary

Problems solved by technology

Now there is a metal cladding technology that can effectively reduce high overcorrosion, but it is limited by technology and process, and the cost is relatively high

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