Stop protection agent and stop protection method for waste heat boiler of gas turbine power plant

The technology of waste heat boiler and protective agent is applied in the field of deactivation protective agent of waste heat boiler of gas turbine power station and its protection, and achieves the effects of non-toxicity, high stability and easy operation during operation.

Active Publication Date: 2014-10-01
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, at present, there is no protective agent and protection method for waste heat boiler decommissioning of gas turbine power plant with good anticorrosion effect, high stability, long storage time, non-toxicity, safety and environmental protection, and low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The protective agent for waste heat boiler in this embodiment includes water, carbohydrazide used to reduce dissolved oxygen in water and promote the formation of a complete and dense protective film on the metal surface, ammonia water used to adjust the pH value, and, An imidazoline quaternary ammonium salt used to form a protective hydrophobic film over the entire metal surface. Among them, the concentration of carbohydrazide is 300-400mg / L, the concentration of imidazoline quaternary ammonium salt is 100-200mg / L; the pH value of the disabled protective agent is 9.5-10.0, which is used to provide an atmosphere for carbon steel surface passivation .

[0017] The shutdown protection method for waste heat boilers in gas turbine power plants in this embodiment is carried out in two steps: the first step is to stop adding phosphate one hour before sliding to stop, and add carbohydrazide until the concentration of carbohydrazide is 300-400mg / L, adjust the pH value to 9.5-...

Embodiment 2

[0020] The composition of the inactive protective agent: the concentration of carbohydrazide is 300-400mg / L, the pH value is 9.5-10.0; the concentration of imidazoline quaternary ammonium salt is 100-200mg / L, the temperature is 100-300°C, and the time is more than 30min.

[0021] The concentration of carbohydrazide is 300-400mg / L (non-toxic. It can reduce the dissolved oxygen in water and has the function of removing oxygen. In addition, it can also reduce high-valent metal oxides to low-valent metal oxides (such as Fe 3 o 4 ), to promote the formation of a complete and dense protective film on the metal surface, so it has a passivation effect); imidazoline quaternary ammonium salt 100-200mg / L (non-toxic. The molecules of the film-forming corrosion inhibitor are based on the relatively large electronegativity The N atom is the center of the polar group (hydrophilic group) and the hydrocarbon group of the non-polar group (hydrophobic group). When they enter the corrosive medium...

Embodiment 3

[0024] The protective agent for waste heat boiler in this embodiment includes water, carbohydrazide used to reduce dissolved oxygen in water and promote the formation of a complete and dense protective film on the metal surface, ammonia water used to adjust the pH value, and, An imidazoline quaternary ammonium salt used to form a hydrophobic protective film on the entire metal surface; wherein, the concentration of carbohydrazide is 300 mg / L, and the concentration of imidazoline quaternary ammonium salt is 120 mg / L; the pH of the deactivated protective agent A value of 10.0 is used to provide an atmosphere for passivation of carbon steel surfaces.

[0025] In this embodiment, the shutdown protection method for waste heat boilers in gas turbine power plants is carried out in two steps: the first step is to stop adding phosphate one hour before the sliding stop, and add carbohydrazide until the concentration of carbohydrazide is 300 mg / L. Use ammonia water to adjust the pH value...

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PUM

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Abstract

The invention relates to a stop protection agent and a stop protection method for the waste heat boiler of a gas turbine power plant. The stop protection agent for the waste heat boiler of the gas turbine power plant comprises water, carbohydrazide used for reducing dissolved oxygen in water and promoting the formation of a complete compact protection film on a metal surface, ammonia water used for adjusting the pH value, and imidazoline-ammonium-salt, wherein the concentration of carbohydrazide is 300-400mg / L, and the concentration of imidazoline-ammonium-salt is 100-200mg / L; the pH value of the stop protection agent is 9.5-10.0. The stop protection method for the waste heat boiler of the gas turbine power plant comprises the following steps of: 1 hour before slide stop, stopping adding phosphate, adding carbohydrazide until the concentration of carbohydrazide is 300-400mg / L, adjusting the pH value to 9.5-10.0 by using ammonia water, and uniformly circulating; when the temperature of main steam is lowered to be below 300 DEG C, adding imidazoline-ammonium-salt in a system, and circulating for more than half an hour. The stop protection agent is good in preservative effect, non-toxic, safe and environment-friendly.

Description

technical field [0001] The invention relates to a protective agent for out-of-service waste heat boilers in a gas turbine power station and a protection method thereof, which are used for protecting the out-of-service waste heat boilers and preventing the waste heat boilers from being corroded. Background technique [0002] Gas-steam combined cycle power station is currently the fastest-growing form of power generation in the world. It has the advantages of high power generation efficiency, short construction period, convenient operation and strong peak regulation ability, etc., which is of great significance to my country's power supply. Because gas turbines have strong peak-shaving capabilities, frequent start and stop, and sometimes need to be shut down for a long time, higher requirements are put forward for the shutdown protection of waste heat boilers. [0003] For a long time, most power plants have been decommissioned according to the ammonia water + hydrazine recomm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/06
Inventor 衡世权常浩陈光刘朝辉
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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