Steam exhausting cooling method and device of condensing steam turbine of auxiliary thermal power station

Abstract

The invention relates to steam exhausting cooling method and device of a condensing steam turbine of an auxiliary thermal power station, belonging to the technical field of power generation and solving the defects existing in the traditional cooling system of the condensing steam equipment. The technical scheme is achieved as follows: a mixed cooling mode is adopted in a process of exhausting steam of the turbine, condensed water in a hot well of a condenser is divided into two paths, one path of the condensed water sequentially enters an air-cooled heat radiator and a refrigeration equipment evaporator for cooling, and then is sprayed into the condenser by a condenser water spraying mechanism to be mixed with exhausted steam of the turbine for heat transmission, condensation heat of the exhausted steam of the turbine is absorbed, condensation equipment is kept vacuum; and the other path of the condensed water passes through a refrigeration equipment condenser, and enters a low-pressure heater after the temperature is raised so as to realize the heat transfer. The invention can flexibly adjust the refrigerating capacity of the cooling system so as to enable the condensing steam equipment to reach an appropriate vacuum and strength the economical efficiency of thermodynamic system; can reduce the climatic environmental influence degree on machine sets and strength the output stability of the device; and also can enable partial condensation heat and the transition heat of power consumption of a refrigeration compressor and the like to be recovered by the condenser for heating and water supply, thereby reducing the loss of the low-temperature end heat.

Description

technical field [0001] The invention relates to an exhaust steam cooling technology for a condensing steam turbine in an auxiliary thermal power station, in particular to a cooling method and device for exhaust cooling of a condensing steam turbine in an auxiliary thermal power station capable of improving the vacuum of the condensing equipment and ensuring stable unit output, and belongs to the technical field of power generation. Background technique [0002] The basic cycle of a steam power plant is the Rankine cycle, and the working medium of this cycle is water vapor. The water is first heated into saturated steam, and then heated into superheated steam through the heater. This process is a constant pressure endothermic process. The superheated steam is introduced into the steam turbine and expands to do work. This work process is generally regarded as an adiabatic expansion process. The exhausted steam that has done work in the steam turbine is discharged into the con...

AI Technical Summary

Problems solved by technology

To sum up, although the air-cooling system can greatly reduce the loss of water resources in thermal power plants, the one-time investment of the air-cooling unit equipped with the air-cooling system is relatively high, the standard coal consumption of power generation is relatively large, and the output of the unit must be limited in the short period of summer. There are problems such as land occupation and noise, which have affected the promotion and development of air cooling systems

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