SU1285307A1 - Arrangement for ball cleaning of heat exchanger tubes - Google Patents

Abstract

The invention relates to a technique for cleaning equipment from contamination, mainly condensing steam turbines. The purpose of the invention is to reduce the energy consumption and maintain a constant flow of cooling water through the heat exchanger. The ball erecting unit contains a water filter in the form of a perforated cone located in the discharge conduit, a device for cleaning the filter, means for spinning the flow of cooling water, a pipeline for dumping contaminants, a pump for feeding balls into the heat exchanger, a ball-trap mesh. New in the installation is the implementation of the means for swirling the flow in the form of a system of nozzles with a water supply pipe and pump, the installation of nozzles with the possibility of twisting the central part of the flow. The pump has an autonomous water supply. The surface of the filter can be made stepwise. 1 il. with (L S

Description

The invention relates to the cleaning of heat exchange equipment from deposits and can be used to clean steam turbine condensers.

The aim of the invention is to reduce energy consumption and maintain a constant flow of cooling water through the condenser.

The drawing shows the installation, general view.

The installation includes a condenser 1, tubes 2, balls 3, a device for trapping balls 4 and a pump for feeding balls 5. Pressure circulation conduit 6 is intended for supplying cooling water to the condenser, drain conduit 7 for discharging it. The filter 8 with holes 9 is designed to clean the cooling water from contamination. The system of nozzles 10 with a water supply pipe 11 is designed to twist the flow of cooling water, the system of nozzles 12 with a water supply mobile pipe 13 is designed to flush contaminants from the surface of the filter. Pump 14 is designed to supply water to both nozzle systems. The device 15 is designed to move (rotate) the movable supply pipe 13. The coupling 16 is designed to connect the movable 13 and the fixed 17 pipes. Nozzles 18 and pipe 19 are designed to collect and remove contaminants. The pipes 11, 17 and 19 are equipped with automatic shut-off devices 20. The pipe 21 is intended for supplying water to water-jet ejectors that suck the air and the vapor space of the condenser 1.

The installation works as follows.

The cooling water is supplied to the condenser 1 through the pressure circulating conduit 6 and after passing the tubes 2 is discharged through the drain conduit 7. The balls 3 circulate in a closed loop: through the condenser tubes 2 - catching device 4 - pump 5 and again tube 2. When passing of the cooling water through the filter 8, a gradual clogging of the openings 9 occurs with debris and, therefore, its hydraulic resistance increases. When the filter reaches a certain limit of 8

the pressure turns on the pump 14 and opens all three automatic valves 20. Water from the pump 14 flows to the nozzles 10 and at a high speed (15-20 m / s) flows tangentially into the flow of cooling water, ensuring its spin. Filters from the surface of the filter are washed off with high-speed jets.

water flowing out of the nozzles 12 and passing through the opening 9 in the filter 3, clearing them of contaminants adhering under the action of a pressure differential (the longer this period, the greater the force holding the contaminants on the surface of the filter) enter the swirling flow and discharged through line 19 into the circulating drain conduit 7 after the ball-collecting grid 4. The nozzles 10 are arranged so that they twist the central part of the flow of cooling water. During operation, the nozzles 12 are rotated together with the tube 13 relative to the surface of the filter 8 by means of the device 15. After cleaning the filter and reducing the pressure differential, a signal is given to

closing the automatic valves 20 and stopping the pump 14.

For some types of pollution it is very efficient to use the energy of the wall vortices formed when the filter surface is made.

step form.

The advantage of the proposed unit for ball cleaning of capacitors is the reduction of energy consumption per spin of the flow compared to other installations in which the entire flow is twisted, as well as the fact that cleaning the filter does not reduce the flow of cooling water to the condenser, which leads to deterioration of vacuum and power reduction

turbines. This is especially dangerous during the period of a deficiency of the MODIHOCTH in the power system and the carrying of peak loads.

Economic; effect when using the invention is defined in

additional generation of electricity, defined as the difference between the underproduction of electricity that occurs when part of the cooling water is discharged during the washout period, in addition to

condenser, and the cost of power to the pump washing. For example, for a 300 MW power unit, this difference is nN 900-300 600 kW, i.e. 0.2% in specific fuel consumption.

Claims (2)

1. An installation for ball cleaning of heat exchanger tubes, mainly steam turbine condensers, containing deposits in the cooling water conduit of the heat exchanger water filter in the form of a perforated cone with a mechanism for cleaning it during operation, including means for spinning the flow of cooling water, so that, in order to reduce energy consumption for the spin flow and maintaining a constant flow of cooling water through the heat exchanger, the means for swirling the flow is in the form of a system of nozzles with a water pipe and a pump, the nozzles being installed in the conduit with the possibility of twisting the central part of the flow of cooling water and pumping water The nozzle system has an autonomous water supply. 2. Installation under item 1, about t l and h a - y shch and with the fact that the surface of the filter is executed step.