Oxygenation method of a liquid constant value oxygenation system

Abstract

The invention discloses a liquid-state constant-value oxygenation system and method. The liquid-state constant-value oxygenation system comprises an oxygen bottle and an oxygen-enriched water generator communicated with the oxygen bottle, a depressurizer is arranged on a pipeline communicating the oxygen bottle with the oxygen-enriched water generator, desalted water is fed in the oxygen-enriched water generator which is communicated with an oxygenation point of a water feeding or condensing system through a delivery device and an oxygenation pipeline, oxygen and the desalted water are mixed in the oxygen-enriched water generator, and oxygen-enriched water is delivered to the oxygenation point through an original oxygenation pipeline. Rigid liquid feeding is adopted, so that a series of technical problems, which cannot be solved at this stage, caused by gas adjusting are avoided; mature process and technology are used ingeniously, so that fluctuation of dissolved oxygen value is eliminated thoroughly, completeness and fixity of a double-layer compact oxidation film on the inner wall of a main water pipeline are guaranteed, and probability of oxidation scale shedding is reduced; manual operation adjusting is not needed, so that oxygenation automation is realized completely.

Description

technical field [0001] The invention relates to the technical field of water supply treatment in the electric power industry, in particular to a liquid constant-value oxygenation system and an oxygenation method. Background technique [0002] Oxygen in high-purity water has a passivation effect on the inner wall of the metal, and can form a dense double-layer passivation protective film. Utilizing this principle, oxygenation treatment is carried out in high-parameter units of thermal power plants, which can effectively inhibit the flow-accelerated corrosion of the feed water system in front of the furnace, reduce the content of corrosion products in the feed water, and avoid the deposition of a large amount of corrosion products in the boiler economizer and boiler due to the feed water. Secondary hazards caused by the water wall; at the same time, oxygenation treatment can slow down the scaling rate of the heating surface of the boiler, suppress the rise of the pressure diff...

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Problems solved by technology

[0004] However, due to the great compressibility of the gas itself, the adjustment of the gas flow is affected by many aspects such as the opening of the regulating valve, the delivery pressure difference, and the diameter of the pipeline, so that the process of regulating the flow of the gas is very complicated and cannot be done with the regulating valve. to linear regulation

For the current power system, the direct oxygen supply technology is used for oxygenation treatment. Since the pressure and flow of the oxygenation point are constantly changing with the load of the unit, it is difficult to control the dissolved oxygen value in water by adjusting the opening of the flow regulating valve of the oxygenation system. Realized, resulting in a large fluctuation range of oxygen in the feed water

On the other hand, during the process of adding oxygen to the power system, the oxygen required is extremely small and the pressure is high. In the case of large fluctuations in the load of the operating unit in the power plant, the flow control valve is required to meet the high-precision control requirements of the extremely small flow. In order to timely and accurately track changes in water supply flow, so far, there are no products that can fully meet these requirements at home and abroad.

[0005] Due to the above reasons, the current power system oxygen direct supply and oxygenation technology has poor operation effect and large fluctuations in oxygen content, which makes many high-parameter thermal power generation units have to give up the advanced treatment method of oxygenation treatment. This caused a huge loss of economic benefits, and also seriously affected the safe operation of the unit.

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