Steam-water system arrangement structure of deep peak regulation double-hearth power station pulverized coal boiler

Abstract

The invention discloses a steam-water system arrangement structure of a deep peak regulation double-hearth power station pulverized coal boiler. The structure comprises a first hearth water-cooling wall (1) and a second hearth water-cooling wall (2) which are coupled with a hearth structure, and economizers (4) at the upstream of inlet headers of the first hearth water-cooling wall (1) and the second hearth water-cooling wall (2) are arranged in a combined manner; and superheaters (5) at the downstream of outlet headers of the first hearth water-cooling wall (1) and the second hearth water-cooling wall (2) are arranged in a combined manner. Aiming at different systems in a steam-water flow, a manner of combining split parallel arrangement and a combined structure is adopted, meanwhile, isolation valves are arranged to ensure that all the systems are independent and communicated, the operation manner is flexible, the hydrodynamic characteristics in a low-load interval are stable, and the steam-water system arrangement manner is closely attached to the design concept of a double-hearth boiler; and the deep peak regulation capability of the double-hearth boiler can be better exerted.

Description

technical field [0001] The invention belongs to the technical field of deep peak shaving of coal-fired power plant units, and in particular relates to an arrangement structure of a steam-water system for a power plant with double furnaces for deep peak shaving. Background technique [0002] With the sharp increase in the installed capacity of new energy such as wind power and photovoltaics, in order to improve the capacity of new energy consumption and ensure the safety, reliability and stability of power grid operation, all coal-fired units need to have higher wide load capacity. Adjustment ability, the minimum need to reach 20% ~ 30% load stable operation. [0003] Affected by the coal quality and equipment conditions of power plants, the current peak-shaving capacity of thermal power units in my country is generally only 50% of the rated capacity under pure condensing conditions, which cannot meet the consumption of new energy that continues to grow in installed capacity....

AI Technical Summary

Problems solved by technology

At present, all power generation boilers are designed according to the base load. Even if certain peak-shaving requirements and various design optimizations are considered, except for some boilers that burn high-quality bituminous coal, it is still difficult to achieve a minimum output of 20% to 30% of the rated power. Deep peak shaving target of load

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