Method for cleaning condenser of turbine closed-type circulating water system

Abstract

The invention discloses a method for cleaning a condenser of a turbine closed-type circulating water system. The method for cleaning the condenser of the turbine closed-type circulating water system is characterized in that in the turbine closed-type circulating water system which comprises a cooling tower, the condenser and an opened-type water system, the cleaning effect of sand on tube bundles in a turbine opened-type circulating water system is simulated, solid particles are added into circulating water in the turbine closed-type circulating water system to form circulating water containing the solid particles, the continuous cleaning effect on the condenser in the turbine closed-type circulating water system and coolers in the opened-type water system is achieved, and the solid particles are ceramsite sand. According to the closed-type circulating water system, the ceramsite sand which is slightly lighter than water is used for simulating the cleaning effect of the sand on the tube bundles in the opened-type circulating water system, the burden of a rubber ball cleaning device can be greatly relieved, the tube bundles are kept clean, the tube bundles are prevented from being corroded, and even the rubber ball cleaning device can be completely replaced.

Description

Technical field [0001] The invention relates to a cleaning method of a steam turbine condenser in a thermal power unit, which reduces tube bundle scaling and corrosion through cleaning. Background technique [0002] The energy-saving work of thermal power units is of great significance. In the energy-saving work of thermal power units, reducing the back pressure of the steam turbine plays an extremely important role. Generally, for a wet-cooled unit, the back pressure is reduced by 1 kPa, and the energy consumption of the unit is reduced by 0.6 ~ 2%, which is about 2 ~ 6 g / (kW.h ), it is different for random type and load change; if the condenser end difference increases by 1℃, the coal consumption of the unit will increase by 1 g / (kW.h) or more. For a 600MW unit, it can be considered that if the coal consumption increases by 1 g / (kW.h), the annual increase in fuel consumption is worth 2.5 million yuan. [0003] The back pressure of the steam turbine is determined by the circulat...

AI Technical Summary

Problems solved by technology

But in fact, due to design, manufacturing, operation, maintenance and other reasons, a considerable part of the rubber ball cleaning devices of domestic large-scale units is still in an unsatisfactory state

In the condensers of domestic large-scale thermal power units, a considerable proportion of them have low cleanliness coefficients, which have obvious adverse effects on back pressure and unit energy consumption

For copper tube bundles, the general design cleaning factor is 0.8~0.85, and for stainless steel tube bundles, the design cleaning factor is generally 0.85~0.9. A corresponding increase in level up to 1 kPa brings great loss

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