Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system

Abstract

The invention discloses a method for slow released regulating and controlling internal cooling type of water microcirculation in large electrical generator as well as monitoring system. When PH value of internal cooling water in circulation system and electric conductivity are less than a certain value, the inlet and outlet valves of small mixing bed are started, making part of internal cooling water pass through a bypass circulation system go along a microcirculation. Thus alkaline matter in microscale slow released is carried in certain range. When PH value of internal cooling water in circulation system and electric conductivity reach a certain value, the inlet and outlet valves are closed. When said values are in certain value, the drainage valve and water compensation valve of demineralized water is opened till electric conductivity of internal cooling water is less than a certain value. The alkaline matter includes negative type of resin and positve type of resin. The monitoring system is composed of water quality monitor and control system, bypass circulation processing control system and water compensation pollution discharge controlling system. The invention can effectively prevent water quality of internal cooling water from deterioration, restrain copper conductor from corrupt. It can be used in large type of generator group in thermal power stations, nuclear powre station and hydroelectric power station.

Description

technical field [0001] The invention relates to a slow-release control method and a monitoring system for the internal cooling water microcirculation of a large generator, belonging to the technical field of electrical engineering. Background technique [0002] The stator windings of large generators such as thermal power plants, nuclear power plant turbine generators, and hydroelectric power plant turbine generators, and the rotor windings of dual-water internally cooled generators are cooled by high-purity water circulation, and the quality of the cooling water is affected by the pollution of oxygen and carbon dioxide in the air. Deterioration, thus causing corrosion of hollow copper conductors. At present, the usual protective method is to seal the cooling water tank with nitrogen or hydrogen and add corrosion inhibitors such as MBT or BTA and its derivatives to the inner cooling water (see "Generator Cooling Medium", Water Resources and Electri...

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Problems solved by technology

Since the airtightness of the internal cooling water circulation system and its supply water pipeline is difficult to be guaranteed, the method of gas sealing with nitrogen or hydrogen is rarely used in engineering practice, and the use of hydrogen has potential safety hazards

The method of adding corrosion inhibitors such as BTA is more commonly used, but there are still many shortcomings. The main problems are: 1. The residual concentration in the system is detected by manual addition and manual sampling analysis; 2. The corrosion inhibitor used is a weak electrolyte , there is no characteristic parameter suitable for on-line detection, and it is not suitable for automatic control; 3. The corrosion inhibitor used is an organic substance containing a benzene ring structure, and the protective film formed has a large thermal resistance, which is not conducive to the cooling of the copper wire winding of the generator Heat dissipation; 4. It is often necessary to manually add agents to repair the protective film

In fact, at present, many power plants have not adopted any adjustment and control measures for the internal cooling water of the generator. The pH value of the internal cooling water has been low for a long time, and the Cu content often exceeds the standard. Therefore, the method of frequent water changes is used to maintain the conductivity. This method has neither Solve the corrosion problem of copper wires, and at the same time waste a lot of high-purity water

The water quality of the internal cooling water has become one of the potential safety hazards of the generator and limits the output of the generator

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