SU1416853A2 - Method of cleaning inner surface of reservoirs - Google Patents

Abstract

This invention relates to the cleaning of internal surfaces of containers, mainly heat exchanger tubes, in particular steam turbine condenser tubes, from deposits of biological and mineral origin. The invention makes it possible to increase the cleaning efficiency of heat exchanger tubes with ice balls of increased diameter and mass. The method of cleaning internal surfaces involves pumping water through a tube with a filler in the form of ice balls of increased diameter and mass. Ice balls are produced by supplying water through a tube which expands at the outlet to an air stream cooled below minus 5 ° C to a narrowed section of the nozzle through which air is supplied. 1 il.

Description

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The invention relates to methods for cleaning the inner surface of containers from deposits of mineral and biological origin and can be used in heat and power engineering, for example, to clean the tubes of steam turbine condensers.

The purpose of the invention is to increase the cleaning efficiency by using ice balls of increased diameter.

The drawing schematically shows a device for drying, testing the proposed method.

A device for cleaning the inner surface of containers, for example, a condenser 1 with tubes 2, contains an air pipe 3 with an adjustable valve 4 for supplying air to the cold generator 5, a pressure pipe 6 for supplying cooling water to a condenser equipped with a valve 7. To the main pipeline b a bypass pipeline 8 is connected with a ventilator 9. The cold generator 5 by the nozzle 10 is connected to the inlet chamber of the condenser 1. The pipeline 8 is connected to the pipe 11, which is rigidly mounted in the water-air nozzle 10 on its axis. Pipeline 11 has an extension 12 at the outlet, before expansion, a calibrated ring (not shown) can be mounted in it. The pipe 10 has a smooth narrowing 13, and the output of the pipeline 11 is installed in the narrowing 13 at the site with the smallest flow area.

The proposed method of drying is as follows.

Chilled water with a temperature of 5-25 ° C through the pressure pipeline 6 through the valve 7 is fed to the tubes 2 of the condenser 1. Part of the cooling water is discharged through the valve 9 to the bypass pipeline 8 and through the pipe 11 to the water inlet pipe 10.

Air is supplied to cold generator 5 by regulating its flow with valve 4. Air cooled to minus temperature is supplied to parasail 10. Passage through constriction 13, the air flow is accelerated, a reduced pressure is created in it, which is transmitted to expansion 12 of conduit 11. through pipeline 11, water through expansion 12 passes through enlarged droplets, which enter the stream of expanded cold air and freeze to form ice balls with a diameter of 3–

4 mm, determined by the degree of expansion of the air in the narrowing of the 13 nozzle 10. Formed ice balls together with water and air enter the receiving chamber of the condenser 1 and its tube 2.

The cleaning of the inner surfaces of the tubes occurs due to the friction of ice balls of increased diameter against the walls of the tubes, as well as the impact on the deposition of turbulent water-air flow. The destruction of sediments also occurs due to temperature deformations due to rapid cooling upon contact with ice balls. Destroyed deposits are removed from the heat exchanger by air-flow.

The flow of water through conduit 6 is determined depending on the type of steam turbine and the mode of its operation. For example, for a T-100-130 turbine with a KG2- 6200 condenser, the maximum flow rate of cooling water is 16,000. The flow of water taken through pipeline 8 to form ice balls of increased diameter is up to 0.5% of the flow of water through pipeline 6.

The volume flow rate of the cooled air entering the nozzle 10 is 8-10 m per 1 kg of water supplied to the nozzle 10, its temperature is from -5 to -10 ° C. The number of ice balls of increased diameter is determined by the flow of water through pipe 8 and cold air Q through pipe 10.

The production and use of ice balls of increased diameter according to the proposed method increases the cleaning efficiency of the tubes of heat exchangers, since each of the balls has a larger mass, several times larger surface and duration of contact with deposits on the walls of the tubes.

Claims (1)

Invention Formula 0 The method of cleaning the inner surface of the containers by author. St. No. 1221476, characterized in that, in order to increase the cleaning efficiency, water is mixed with air under reduced pressure by supplying water to the air flow in the section of the air nozzle with a reduced flow area through the bypass conduit having an expansion outlet.