High-capacity circulating fluidized bed boiler

Abstract

The invention provides a high-capacity circulating fluidized bed boiler. The high-capacity circulating fluidized bed boiler comprises a water-cooled wall hearth, a cyclone separator and a rear smoke well, a high-temperature smoke outlet of the water-cooled wall hearth communicates with an inlet of the cyclone separator, a solid material outlet of the cyclone separator communicates with a materialreturn opening of the water-cooled wall hearth, a steam-state material outlet of the cyclone separator communicates with the rear smoke well for heating feed water, and the water-cooled wall hearth, the cyclone separator and the rear smoke well are connected to provide a steam-water main circulation loop. The high-capacity circulating fluidized bed boiler is characterized in that a heating surfaceof the steam-water main circulation loop only comprises a screen structure arranged in the water-cooled wall hearth. The high-capacity circulating fluidized bed boiler can meet the capacity requirement of the high-capacity circulating fluidized bed boiler, is flexible in design and good in adjusting performance and can adapt to different fuel, and safe and stable operation of the boiler is ensured.

Description

technical field [0001] The invention relates to a high-efficiency ultra-supercritical circulating fluidized bed boiler, in particular to the overall layout of a large-capacity circulating fluidized bed boiler and the design of its steam-water flow. Background technique [0002] Circulating fluidized bed boilers have the characteristics of a wide range of applicable fuels and low pollution emissions, and are widely used in various industries. In order to obtain a higher energy utilization rate, the design of circulating fluidized bed boilers continues to develop in the direction of large capacity and high parameters. In order to meet this requirement, a structural layout of a large-capacity circulating fluidized bed boiler and its steam-water flow design are now provided. [0003] Such as figure 1 As shown, it is a simplified structural diagram of a traditional circulating fluidized bed boiler, which is an M-shaped structure with a single furnace. Furnace 1 is a membrane-t...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: as the capacity of the traditional circulating fluidized bed boiler increases, it cannot effectively cope with the larger increase in the heat absorption of the superheater than that of the evaporation, and cannot solve the problem of insufficient placement of the heating surface of the reheater. Cannot meet the requirement for more cyclones to be added to the system

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