Treatment process for adding strong base into power station boiler feed water

A power plant boiler and alkali treatment technology, which is applied in the field of boiler feed water treatment, can solve the economic and safety losses of power plants, fail to solve the problems of scale explosion accidents, increase coal consumption due to heat transfer, and avoid thermal system abnormalities and accidents , Guarantee long-term safe and economical operation, and the effect of reducing system corrosion products

Active Publication Date: 2015-07-08
云南聚杰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of adding ammonia to the water supply may cause the water supply pipes, especially the pipes containing copper or copper alloy in the water supply system, to be corroded due to ammonia addition, and the corrosion products enter the steam drum and deposit on the furnace tubes, resulting in fouling of the furnace tubes. On the one hand, it affects heat transfer and increases coal consumption. On the other hand, when there is serious fouling, a tube burst accident will be caused by overheating; after the corrosion products of the feed water enter the boiler or enter the steam turbine with the water vapor, it will cause salt accumulation in the steam turbine to varying degrees; Oxygenation process fails to solve the tube explosion accidents caused by a large number of scale shedding of superheater superheater in many supercritical units at present, and oxygenation process is limited to units whose water supply system is copper-free system
These two processes may bring more serious losses and hidden dangers to the economy and safety of the power plant.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A 600MW coal-fired power unit in Yunnan belongs to a subcritical pressure drum furnace. Before the implementation of the present invention, the qualified condition of the furnace water quality (the qualified standard of the furnace water is that the conductivity of the furnace water is 15μs / cm-25μs / cm, and the boiler water PO 4 3-1.0mg / L~2.0mg / L, silicon in boiler water <80μg / L), the pH value of boiler water is between 9.3~9.5, and when the unit load is above 550MW, the sodium content of the main steam often reaches 30μg / L~50μg / L, the hydrogen conductivity of the main steam is greater than 0.3μs / cm, the pressure of the high-pressure regulating stage of the turbine and the pressure of the first-stage extraction steam have exceeded the specified value, and the pressure of the high-pressure regulating stage of the turbine and the pressure of the first-stage extraction steam increase with the continuous operation time of the unit Increase, under the condition of 548MW load...

Embodiment 2

[0028] A 1000MW ultra-supercritical once-through boiler unit in Zhejiang, before the implementation of the present invention, when the pH value of the feed water was 9.0-9.6, the iron and copper ions in the water supply system often exceeded the standard, sometimes reaching a value as high as 14 μg / L. The choke ring frequently deposits metal corrosion products, and must be shut down for cleaning every quarter. After implementing the present invention, the pH value of the boiler water is between 9.0 and 9.6, the concentration of sodium ions in the main steam is ≤10.0 μg / L, and the long-term stable point of iron ions in the high-pressure water supply system is ≤5.0 μg / L, effectively avoiding the Turbine builds up salt quickly.

[0029] The amount of alkali added during the operation of a once-through boiler unit of a 1000MW ultra-supercritical unit in Zhejiang is:

[0030] In the stage of adding alkali to the water supply system, the amount of alkali added to the outlet of the ...

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PUM

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Abstract

The invention provides a treatment process for adding strong base into power station boiler feed water. The treatment process for adding the strong base into the power station boiler feed water is applicable to a steam pocket furnace and a direct current furnace, a base adding state comprises a water supply system base adding stage and a water supply system base adding and membrane repairing stage, wherein the water supply system base adding system comprises that base is added into the outlet of a condensate polishing system and the inlet of a feed water pump of a high pressure water supply system at the same time, and pH value of feed water and sodium ion concentration in main steam are controlled; the water supply system base adding and membrane repairing stage comprises that base addition amount of the high pressure water supply system is reduced after a protective membrane for a water supply system is formed, so that the added base only can be used for repairing and maintaining the protective membrane; meanwhile, pH value of boiler water and the sodium ion concentration in the main steam are controlled. The treatment process for adding the strong base into the power station boiler feed water has the advantages that corrosion resistance can be realized on the whole thermodynamic system, the salification problem also can be solved, the treatment process for adding the strong base into the power station boiler feed water is applicable to water supply systems made from various materials and a boiler water treatment process does not need to be separately selected any more.

Description

technical field [0001] The invention belongs to the technical field of boiler feed water treatment, and in particular relates to an enhanced alkali treatment process for power plant boiler feed water. Background technique [0002] The traditional water treatment process includes ammonia addition, ammonia addition, hydrazine treatment and oxygenation treatment. The process of adding ammonia to the water supply may cause the water supply pipes, especially the pipes containing copper or copper alloys in the water supply system to be corroded due to ammonia addition, and the corrosion products enter the steam drum and deposit on the furnace tubes, resulting in fouling of the furnace tubes. On the one hand, it affects heat transfer and increases coal consumption. On the other hand, when there is serious fouling, it will cause a pipe burst accident due to overheating; after the corrosion product of the feed water enters the boiler or enters the steam turbine with water vapor, it w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66
Inventor 马祝平
Owner 云南聚杰环保科技有限公司
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