Tower-type boiler with primary reheater and secondary reheater

Abstract

The invention discloses a tower-type boiler with a primary reheater and a secondary reheater. A superheater of the boiler comprises a low-temperature superheater and a high-temperature superheater; a technological process of a main steam system comprises the following steps that: feeding water enters a front flue coal economizer and a rear flue coal economizer which are arranged in parallel; water from outlets of the coal economizers enters water-cooling walls from the lower part of a hearth; outlets of the water-cooling walls are connected with a separator; and steam of an outlet of the separator enters the low-temperature superheater and the high-temperature superheater sequentially. According to a low-to-high flow direction of temperatures on a steam side, the primary reheater sequentially comprises primary reheating low-temperature reheaters and a primary reheating high-temperature reheater, the secondary reheater sequentially comprises secondary reheating low-temperature reheaters and a secondary reheating high-temperature reheater, and the primary reheater and the secondary reheater are connected with each other in parallel in a perpendicular flue.

Description

technical field [0001] The invention relates to a boiler with a double reheater for the power industry. Background technique [0002] In a power plant, the steam becomes relatively low pressure after doing work in the high-pressure cylinder of the steam turbine, is discharged from the high-pressure cylinder, enters the primary reheater of the boiler to be heated, and is supplied to the steam turbine for a reheating medium-pressure cylinder to perform work, then is discharged and enters the boiler It is heated in the secondary reheater and supplied to the secondary reheating intermediate pressure cylinder and low pressure cylinder of the steam turbine to do work. Such a thermodynamic cycle with two reheats is more efficient than a one-reheat thermodynamic cycle. The boilers with double reheat described above are used in power plants. [0003] The main factors affecting the efficiency of the thermodynamic cycle are the steam pressure used for work, the steam temperature and ...

AI Technical Summary

Problems solved by technology

The heat absorption ratio of the reheater is relatively large, and there are two reheating outlet temperatures above 600°C. Due to the heat transfer, there must be sufficient heat transfer temperature difference, otherwise a large number of heat transfer areas need to be arranged, which not only increases the cost, but also requires a limited space. Difficult to arrange inside, increase boiler size

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