Secondary reheating million unit high-pressure heater system structure and application method thereof

Abstract

The invention discloses a secondary reheating million unit high-pressure heater system structure. The structure comprises a steam turbine, a high-pressure heater set and an external steam cooler set;the high-pressure heater set comprises a first high-pressure heater, a second high-pressure heater, a third high-pressure heater and a fourth high-pressure heater; single-row coiler vertical high-pressure heaters are adopted; the first high-pressure heater, the second high-pressure heater and the third high-pressure heater are arranged in a zero-meter layer of a steam machine room; the fourth high-pressure heater is arranged in an operation layer of a deaeration room; the external steam cooler set comprises a second external steam cooler and a fourth external steam cooler; U-shaped tube vertical heaters are adopted; the second external steam cooler is arranged in a middle layer of the steam machine room; and the fourth external steam cooler is arranged in the operation layer of the deaeration room. Meanwhile, the invention discloses an application method of the secondary reheating million unit high-pressure heater system structure. The structure has the characteristics of capability ofreducing the manufacturing cost of the steam machine room, simplification of the system, reduction of the engineering quantity, improvement of the unit economy, acceleration of the unit start time and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal power, and in particular relates to a system structure of a high-pressure heater with a double reheating million units and a method for using the same. Background technique [0002] Domestic high-pressure heaters can be divided into U-shaped tube heaters and serpentine tube heaters according to the shape of the heat exchange tubes. The high-pressure heaters of the million-level primary reheat units that have been put into operation include U-shaped tube horizontal high-pressure heaters and double-row U-shaped tube horizontal high-pressure heaters. Due to processing technology, domestic large-scale thermal power plants are also relatively Serpentine tube heaters are rarely used, and vertical heater arrangements are rarely used for large units. With the rapid development of thermal power generation technology, the capacity and parameters of the unit continue to increase, and the capacity and parame...

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Problems solved by technology

However, this layout greatly increases the volume of the turbine room, and it is not conducive to the inspection of personnel in operation, and the steam extraction and high-pressure water supply pipelines are long, and the double-column high-pressure system is complicated, and the steam extraction pipelines, drainage pipelines, system measurement points, etc. It also needs to increase accordingly, which increases the difficulty of unit operation and maintenance

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