Wet and cold steam turbine generator unit lubricating oil heat recovery and utilization method

Abstract

The invention provides a wet and cold steam turbine generator unit lubricating oil heat recovery and utilization method. Lubricating oil return heat is used for preheating condensed water returning a furnace, so that extraction steam of a final-stage low pressure heater is reduced, power output is increased, heat consumption is reduced, and part or all of cooling water of oil coolers can be saved. Meanwhile, scaling of the oil coolers and heat pollution to the environment can be retarded. The condensed water is adopted as the cooling water, and the quality of the condensed water is far superior to open cooling water or closed cooling water, so that pollution and scaling of at the oil coolers are effectively reduced, and the oil coolers are made in an efficient running state for the long term.

Description

technical field [0001] The invention relates to a lubricating oil system of a turbogenerator set, in particular to a method for recovering and utilizing the lubricating oil heat of a wet-cooling turbogenerator set. Background technique [0002] The lubricating oil system of the steam turbine generator set is a forced circulation lubrication system. Its return oil needs to be cooled by water. The cooling water source comes from the open or closed circulation cooling water system of the power plant. The conventional water demand is about 300~1000t / h. The oiler exchanges heat with the lubricating oil, and then the cooling water in the oil cooler transfers the heat to the external environment. The heat returned from the lubricating oil is not recycled, and the lost heat will cause thermal pollution to the external environment. In addition, the water quality of the cooling water is usually poor, and the oil cooler is prone to fouling, which seriously affects the heat exchange and...

AI Technical Summary

Problems solved by technology

[0002] The lubricating oil system of the steam turbine generator set is a forced circulation lubrication system. Its return oil needs to be cooled by water. The cooling water source comes from the open or closed circulation cooling water system of the power plant. The conventional water demand is about 300~1000t / h. The oiler exchanges heat with the lubricating oil, and then the cooling water in the oil cooler transfers the heat to the external environment. The heat returned from the lubricating oil is not recycled, and the lost heat will cause thermal pollution to the external environment.

In addition, the water quality of the cooling water is usually poor, and the oil cooler is prone to fouling, which seriously affects the heat exchange and needs to be cleaned regularly, which increases the maintenance workload of the unit and the operation and maintenance cost

[0003] On the other hand, the exhausted steam condensate of the steam turbine needs to be returned to the boiler to produce steam, and it needs to be preheated. The heat source mainly comes from the recovery and extraction of steam at all levels of the unit, which loses part of the output of the unit and reduces the power generation.

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