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

A technology for steam turbine generator set and heat recovery, applied in the field of lubricating oil system, can solve the problems of increasing the maintenance workload of the unit, easy scaling of the oil cooler, and unrecovered heat of the lubricating oil return.

Active Publication Date: 2015-03-25
DONGFANG TURBINE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment Construction

[0010] see figure 1 , The circulating lubricating oil system is usually equipped with two oil coolers 5 (5A, 5B), one for use and one for standby, switched by switching valve 6, and one of them is used.

[0011] The oil cooler 5B on the right is an unmodified cooling oil system. The oil return temperature of lubricating oil is usually 60-65°C, and it is cooled to 40-45°C by circulating cooling water. The conventional water demand is about 300~1000t / h.

[0012] The oil cooler 5A on the left is a modified cooling oil system, including a wet condenser 1, a condensate pump 2, a steam seal heater 3, and a low-pressure heater 4 at the end. The implementation is: a branch is drawn from the outlet of the condensate pump 2, and part or all of the condensate in the wet condenser 1 is introduced into the oil cooler 5A to replace the conventional circulating cooling water. The temperature of the condensate is usually controlled at 39°C Next, adjust the flow rate of the condensed water by...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/00
CPCY02P80/15
Inventor 史宣平薛军张志勇方宇刘金芳王文中罗方魏小龙朱志坚郑建
Owner DONGFANG TURBINE CO LTD
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