Method for conditioning cool water quality in large-sized power generator and monitor control system

Abstract

The invention relates to a method of regulating water quality for internal cold water in large generator and the monitoring and controlling system. It is realized by installing a by-pass water quality regulating system on major closed circuit for internal cold water to treat part of cold water, and controlling every index of cold water in generator and preventing corrosion. The said by-pass system comprises by-pass major conduit and a plurality of water-treating units. The by-pass system can also treat make-up water for cold water and monitor hydrogen content in cold water; and it will fill nitrogen to generator if generator stops work. The invention also discloses a method of regulating pH for cold water by using high pure ammonia gas and a method of keeping high dissolved oxygen amount under neutrality condition of low conductivity.

Description

technical field [0001] The invention relates to a water quality adjustment method and a monitoring control system for internal cooling water of a large-scale generator. By adopting the concept of bypass design and integration of multiple water treatment units, the comprehensive control of various indicators of the internal cooling water of the generator and the role of corrosion protection are realized. The invention can also realize the treatment of supplementary water in the internal cooling water of the generator and the monitoring of the hydrogen content in the internal cooling water. In addition, the invention also relates to a method for using high-purity ammonia to adjust the pH value of the inner cooling water of the generator and a method for maintaining high dissolved oxygen in the generator under the condition of neutral water quality with low conductivity. Background technique [0002] Large-scale generators are used in thermal power plants, hydropower plants, an...

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Problems solved by technology

[0011] The current operation mode and existing problems of the internal cooling water system of generators are: (1) Adding copper corrosion inhibitor method: the pH value and conductivity of the internal cooling water are difficult to meet the standard requirements at the same time, the water quality is unstable, the copper content is high, and the corrosion inhibition The complexation reaction between the agent and copper ions is easy to produce deposition

(2) Small mixed bed treatment method: the effluent has a low pH value and is weakly acidic, failing to meet the standard requirements, causing serious corrosion to copper wires, and corrosion products are easy to deposit

(3) Frequent water change method: a large amount of desalinated water is wasted, and the high dissolved oxygen and low pH of desalinated water make copper wire rods prone to corrosion

(4) Hydrogen type + sodium type double-set small mixed bed bypass treatment, the resin failure period is short, usually several months, the resin is replaced frequently, and it is difficult to achieve quantitative control of conductivity and pH

(5) Slightly alkaline water treatment method: By using different resins for proportioning, the treated water is slightly alkaline water with low conductivity (<0.3μs / cm), but once the resin proportion is determined, it will be determined Quantitative relationship between effluent conductivity and pH value, so the effluent conductivity and pH cannot be adjusted independently, and such a low conductivity of effluent will accelerate the corrosion of copper

(5) Ammonization treatment of condensed water: only for NH 3 The condensate is treated and does not involve the treatment of supplementary desalinated water; due to the NH 3 The conductivity of the condensed water itself is relatively high, usually up to 3us / cm, which leads to a very limited range of water quality for its adjustment of the generator; it is impossible to independently adjust the pH and conductivity of the inner cooling water, and the flexibility and applicability of the control Poor sex

(6) Purification device method composed of (RO+GTM): This method combines RO and GTM as a whole and controls it, so this determines that this system cannot control the conductivity and dissolved oxygen of the cooling water in the generator. for independent control

The hydrogen content detected by this method cannot represent the amount of hydrogen contained in the inner cooling water, but can only qualitatively indicate whether the hydrogen in the generator has leaked into the inner cooling water and how much hydrogen has leaked into the inner cooling water trend of change

The hydrogen content detected by this method is not only greatly affected by the detection cycle and detection instruments, but also related to factors such as the water level of the inner cooling water tank and the hydrogen replenishment operation of the generator. It is difficult to quantitatively express the amount of hydrogen leaked by the generator and the hydrogen gas. Volume fraction in inner cooling water or inner cooling water tank

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