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Method for reducing temperature of high-temperature metal piece of gas turbine by ammonia decomposition catalysis reaction

A technology for gas turbines and metal parts, which is applied in the cooling of turbines/propulsion devices, engine components, and engines, and can solve problems such as difficult cooling effects, small adjustability, and small heat capacity

Inactive Publication Date: 2012-07-11
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small heat capacity and low thermal conductivity of air, it is difficult to further greatly improve the cooling effect
The flow rate of cooling air is determined by air pressure difference and air resistance, and the adjustability is also small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A kind of porous α-Al that loads nickel is filled in the nickel tube through the air inlet port 2 o 3 A mixture of 2 grams of catalyst and 3 grams of fine corundum ceramic balls. Catalyst particle size is 20-50 mesh, specific surface area is 15m 2 / g, the nickel loading is 20wt%. Then fill in a section of fine corundum ceramic ball and plug the end with refractory fiber. Under the condition of no ventilation (air atmosphere), pass a large current into the nickel tube to make it red hot. After the temperature of the nickel tube sealed in the ceramic insulation sleeve rises to 1373K, keep the current and voltage stable to keep the temperature constant for half an hour, and pass the current The voltage is used to calculate the heating power. Turn off the power to let the nickel tube slowly cool down to below 473K, feed 25ml / min of ammonia gas, pass a large current to the nickel tube to make it red hot, and the ammonia gas and the hydrogen generated by its...

Embodiment 2

[0026] Embodiment 2: This embodiment detects the components of the airflow sprayed from the small hole, thereby examining the ammonia decomposition effect under different conditions. Connect a Ф3×0.5mm stainless steel pipe to the nitrogen flow path, let the nitrogen fill the pipe and overflow at a low speed, insert the stainless steel pipe into a refractory ceramic pipe with an inner diameter of 3mm, and insert the other end of the ceramic into the small nozzle of the jet flow on the nickel pipe On the hole, stop the nitrogen flow and connect the stainless steel tube gas path to the gas chromatographic gas sampling six-way valve to introduce the gas flow ejected from the small hole on the nickel tube. After a period of stability, the six-way valve injects gas chromatographic samples. Gas chromatography uses hydrogen as carrier gas, thermal conductivity detection, and 5A molecular sieve packed column to separate different gas components. If there is ammonia in the injected gas,...

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PUM

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Abstract

The invention provides a method for reducing temperature of a high-temperature metal piece of a gas turbine by absorbing heat through ammonia decomposition catalysis reaction. The technology comprises the following steps of: (1) providing heat to gasifying liquid ammonia into ammonia gas, and allowing the ammonia gas to enter a fixed or rotary high-temperature metal piece of the gas turbine; and (2) absorbing heat on the surface of a nickel metal catalyst by ammonia and decomposing into hydrogen and nitrogen on the high-temperature metal piece, and taking away heat. The hydrogen and nitrogen flow into a combustion chamber and are used as auxiliary fuels, or are directly sprayed to be combusted on the surface of the turbine so as to increase energy of gas.

Description

technical field [0001] The invention relates to a method for using ammonia flow to decompose in nickel-based high-temperature metal parts of gas turbines to generate nitrogen and hydrogen, while absorbing a large amount of heat to reduce the temperature of the metal parts. In particular, it relates to the method of introducing ammonia flow from the turbine shaft, and the ammonia flow decomposes and absorbs heat inside the hollow nickel-based turbine blade to reduce its temperature. The generated nitrogen and hydrogen are injected from the small holes on the surface of the turbine into the main gas flow, where the hydrogen can be combusted with the excess oxygen in the main gas flow to fully utilize the heat energy contained in it. Therefore, the introduction of ammonia can not only strongly cool the nickel-based metal turbine, but also provide high-quality hydrogen auxiliary fuel for the gas flow. Background technique [0002] Gas turbines include turbojets, turbofans, turb...

Claims

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Application Information

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IPC IPC(8): F02C7/18F02C7/22
Inventor 王洪林
Owner YUNNAN UNIV
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