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Method for inhibiting operation corrosion of air cooling island of direct air cooling unit based on oxidizing agent

A technology for operating corrosion and air-cooled units, which is applied in steam/steam condensers, damage protection, lighting and heating equipment, etc., and can solve problems such as the influence of the operating cycle of the condensate polishing system, the influence of design temperature and humidity, and high system pressure

Pending Publication Date: 2022-06-24
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application number is 201310193365.6, and the title of the invention is: a method for inhibiting the corrosion of direct air-cooled condensers in power plants, which simply uses low-molecular organic amines as alkalizing agents for anti-corrosion of air-cooled islands, and the dosing points are in the medium-pressure cylinder and low-pressure cylinder On the connecting pipe, the system pressure at the dosing point is relatively high. Although it can increase the pH of the initial condensate water and reduce the content of corrosion products, it still has a great impact on the operation cycle of the condensate polishing system, and the anti-corrosion effect needs to be further improved. At the same time It has an influence on the design temperature and humidity of the blades at all levels of the low-pressure cylinder

Method used

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  • Method for inhibiting operation corrosion of air cooling island of direct air cooling unit based on oxidizing agent
  • Method for inhibiting operation corrosion of air cooling island of direct air cooling unit based on oxidizing agent

Examples

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Embodiment 1

[0034] like figure 1 As shown, this embodiment is a method for inhibiting the operation corrosion of the air-cooling island of the direct air-cooling unit based on the oxidant, and the dosing position is selected on the steam turbine exhaust pipe.

[0035] The oxidant containing stabilizer is added as a chemical agent to the steam turbine exhaust pipe or the steam distribution pipe of the air-cooled island, which can inhibit the operation corrosion of the air-cooled island.

[0036] The stabilizer is urea.

[0037] The oxidant is hydrogen peroxide.

[0038] The mass ratio of the stabilizer to the oxidant is 0.1:1000.

[0039] The dosage of oxidant containing stabilizer is 30μg / L.

[0040]The oxidant added by the invention works together with the original ammonia water with a large vapor-liquid distribution coefficient in the system, and simultaneously suppresses the accelerated corrosion of the gas-liquid two-phase flow carbon steel of the air-cooled island, and can reduce ...

Embodiment 2

[0042] like figure 2 As shown, in this embodiment, a method for inhibiting the running corrosion of the air-cooling island of a direct air-cooling unit based on an oxidant is selected, and the dosing position is selected on the steam distribution pipe of the air-cooling island.

[0043] The oxidant containing stabilizer is added as a chemical agent to the steam turbine exhaust pipe or the steam distribution pipe of the air-cooled island, which can inhibit the operation corrosion of the air-cooled island.

[0044] The stabilizer is barbiturate.

[0045] The oxidant is cumene hydrogen peroxide.

[0046] The mass ratio of the stabilizer to the oxidant is 100:1000.

[0047] The dosage of oxidant containing stabilizer is 400μg / L.

[0048] The oxidant added by the invention works together with the original ammonia water with a large vapor-liquid distribution coefficient in the system, and simultaneously suppresses the accelerated corrosion of the gas-liquid two-phase flow carbon...

Embodiment 3

[0050] The oxidant containing stabilizer is added as a chemical agent to the steam turbine exhaust pipe or the steam distribution pipe of the air-cooled island, which can inhibit the operation corrosion of the air-cooled island.

[0051] The stabilizer is urotropine.

[0052] The oxidant is a mixture of hydrogen peroxide and sodium peroxide.

[0053] The mass ratio of the stabilizer to the oxidant is 1:1000.

[0054] The dosage of oxidant containing stabilizer is 500μg / L.

[0055] The oxidant added by the invention works together with the original ammonia water with a large vapor-liquid distribution coefficient in the system, and simultaneously suppresses the accelerated corrosion of the gas-liquid two-phase flow carbon steel of the air-cooled island, and can reduce the iron content of the condensed water at the outlet of the air-cooled island from 10 ~20μg / L is reduced to below 3μg / L to reduce the secondary damage of corrosion products to the water vapor system.

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Abstract

A method for inhibiting operation corrosion of an air cooling island of a direct air cooling unit based on an oxidizing agent comprises the steps that the oxidizing agent containing a stabilizer is adopted as an agent, and the agent is added into an exhaust pipeline of a steam turbine or a steam distribution pipe of the air cooling island through a special agent adding device. Operation corrosion of the air cooling island can be effectively inhibited, the iron content of condensed water is reduced, the operation burden of a precision processing system is relieved, the risk that corrosion products are transferred to a water vapor system is reduced, then the water vapor quality is improved, and great significance is achieved for protecting the air cooling island and improving the operation economical efficiency and safety of a direct air cooling unit.

Description

technical field [0001] The invention belongs to the technical field of air-cooling islands of direct air-cooling units, and in particular relates to a method for inhibiting operation corrosion of the air-cooling islands of direct air-cooling units based on an oxidant. Background technique [0002] The heat exchange components of the direct air-cooled condenser have a huge area. In order to reduce the cost, most of them are made of carbon steel. During the operation of the generator set, when the exhaust steam from the low-pressure cylinder of the steam turbine enters the condenser, the volatile alkalizing agent (ammonia) in the steam It is difficult to enter the liquid film. At this time, the ammonia content of the initial condensed water is much lower than that of steam, and the exhaust temperature of the low-pressure cylinder of the air-cooled unit is about 50 °C, and the water temperature is low, so a dense protective film cannot be formed on the surface of carbon steel. ...

Claims

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Application Information

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IPC IPC(8): F28B9/00F28F19/00
CPCF28B9/00F28F19/002
Inventor 胡振华曹杰玉李俊菀姬定西李健博孟龙
Owner XIAN THERMAL POWER RES INST CO LTD