Multi-layer wall high-parameter main steam pipeline with interlayer fluid cooling
A fluid cooling, multi-layer wall technology, applied in pipeline protection, pipeline heating/cooling, pipeline protection through thermal insulation, etc., can solve the technical difficulties of high cost, low nickel resources, manufacturing and welding of nickel-based alloy main steam pipelines Large and other problems, to achieve the effect of reducing the cost and reducing the consumption
Pending Publication Date: 2019-03-15
SHANGHAI POWER EQUIP RES INST
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[0030] Below in conjunction with specific embodiment, further illustrate the present invention.
[0031] A certain type of 1000MW double reheat generating set, the rated main steam temperature at the turbine inlet is 700°C, the rated main steam pressure is 35MPa, the main steam flow rate is 2402.54t / h, two high parameter main steam pipelines A are arranged as follows figure 1 As shown, the flow rate of a single main steam pipeline is 1201.27t / h.
[0032] The high-parameter main steam pipeline A adopts a multi-layer wall high-parameter main steam pipeline cooled by interlayer fluid, such as figure 2 As shown, the multi-wall high-parameter main steam pipeline cooled by interlayer fluid is composed of pipeline inner wall 1, annular interlayer 2, pipeline outer wall 4, insulation layer 5 and protective layer 6 arranged coaxially from inside to outside in sequence.
[0033] Wherein, the annular interlayer 2 is provided with a non-full-circle annular spacer 3, and the structure of...
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The invention provides a multiple layer wall high-parameter main steam pipeline with interlayer fluid cooling. The multiple layer wall high-parameter main steam pipeline comprises a pipeline inner layer wall made of nickel-based alloy and a pipeline outer layer wall made of austenitic steel, the outer wall of the pipeline is coaxially arranged on the outer side of the inner layer wall of the pipeline, an annular interlayer is formed between the pipeline inner layer wall and the pipeline outer layer wall; and main steam with the temperature of 660-760 DEG C and the pressure of 24 MPa-45 MPa flows in a circular pipeline formed by the pipeline inner layer wall, cooling fluid flows in the annular interlayer, and the flowing direction of the cooling fluid is opposite to the flowing direction ofthe main steam. According to the pipeline, a single-layer wall pipeline of all the nickel-based alloy is replaced with the nickel-based alloy and an austenitic steel multiple layer wall pipeline, thepipeline inner layer wall is made of a small amount of the nickel-based alloy, the pipeline outer layer wall adopts austenitic steel, the annual interlayer in the middle adopts the fluid cooling device, so that the manufacturing cost of the high-parameter main steam pipeline is greatly reduced, and meanwhile the use amount of the nickel-based alloy is reduced.
Description
technical field [0001] The invention relates to a high-parameter main steam pipeline, in particular to a multilayer-wall high-parameter main steam pipeline cooled by an interlayer fluid, and belongs to the technical field of thermal systems of power plants. Background technique [0002] For high-parameter main steam pipelines whose main steam temperature ranges from 660°C to 760°C, main steam pressure ranges from 24MPa to 45MPa, and generator power ranges from 600MW to 1500MW, the operating temperature exceeds 650°C. The upper limit of the working temperature of austenitic steel with good manufacturing and welding performance is 650°C. Therefore, austenitic steel cannot be used in high-parameter main steam pipelines with a main steam temperature of 660°C to 760°C. [0003] The prior art scheme of the high-parameter main steam pipeline adopts a nickel-based alloy single-wall pipeline structure. The use of nickel-based alloys to manufacture high-parameter main steam pipes fac...
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IPC IPC(8): F28D7/10
CPCF16L9/14F16L53/70F16L59/028
Inventor 史进渊徐佳敏赵双群蒋俊邓志成王家鋆王思远林润达
Owner SHANGHAI POWER EQUIP RES INST