Condenser cleaning system and cleaning method in steam turbine closed type circulating water system

Abstract

The invention discloses a condenser cleaning system and cleaning method in a steam turbine closed type circulating water system. The condenser cleaning system is characterized in that according to the steam turbine closed type circulating water system with a cooling tower, a condenser and an open type water system, a settling pond is arranged on an outlet of the condenser, water flowing out of the settling pond and water flowing out of the open type water system enter the cooling tower jointly, and solid particles discharged from the bottom of the settling pond enter the condenser again through a water inlet of the condenser; the solid particles are ceramsite sand with the density of 1-2g / cm<3>. According to the condenser cleaning system and cleaning method, aimed at the closed type circulating water system, the ceramsite sand is utilized to simulate a cleaning effect of sand in the open type circulating water system on a tube bundle, burdens of a rubber ball cleaning device can be greatly relieved, tube bundle is kept clean and protected against corrosion, and even the rubber ball cleaning device can be completely replaced.

Description

technical field [0001] The invention relates to a cleaning system and a cleaning method for a steam turbine condenser in a thermal power unit, and the scaling and corrosion of tube bundles are reduced 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, it is extremely important to reduce the back pressure of the steam turbine. Generally, for wet-cooled units, the back pressure is reduced by 1kPa, and the energy consumption of the unit is reduced by 0.6-2%, that is, about 2-6g / (kW.h), The random type and load change are different; if the condenser end difference increases by 1°C, the coal consumption of the unit will increase by 1g / (kW.h) or more. For a 600MW unit, it can be considered that if the coal consumption increases by 1g / (kW.h), the annual increase in fuel consumption is worth 2.5 million yuan. [0003] Turbine back pressure is determined by circula...

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. Correspondingly increase the level up to 1kPa, bringing great loss

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