Three-factor matching method for improving energy efficiency for blade type fluid machinery
A technology of fluid machinery and matching method, which is applied to components of pumping devices for elastic fluids, mechanical equipment, liquid fuel engines, etc., and can solve problems such as reduced operating efficiency and low design efficiency
Inactive Publication Date: 2008-11-26
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
[0004] 1. At present, the product design efficiency of more than 80% of my country's fluid machinery is 2%-4% lower than the international advanced level, and the actual operating efficiency is 20-30% lower than the highest efficiency point of the unit. It is extremely common
[0005] 2. In actual operation, according to the actual requirements of the fluid delivery system, the compressor machinery often works in a non-design state. In this operating situation, the operating efficiency will be greatly reduced under the condition that the pressure ratio remains unchanged.
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[0042] In order to clearly state the core content of the present invention, now with the characteristic curve of a certain axial flow compressor (see figure 1 )Be explained.
[0043] The left end of the surge line is the area where the original unit cannot work. Once the system enters this area, strong fluid oscillation will occur, and in severe cases, catastrophic accidents will occur, and the actual operation is matched with surge prediction and anti-surge measure. The dotted line is the operating point where the efficiency is equal, and the efficiency will increase as the area enclosed by the ellipse decreases. figure 1 The n1, n2, n3, n4, n5, n6 curves in the figure are the characteristic lines of the compressor operating at different speeds. Taking n5 as the design speed, the characteristic line shows the corresponding relationship between the unit pressure ratio and the flow rate. When the fixed installation angle of guide vane and stationary vane remains unchanged, un...
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The invention relates to a vane type fluid mechanical energy-saving effect-improving three-factor matching method which relates to the technology of fluid conveying. The invention is used for a universal vane type fluid compressing mechanical system; the running of the whole system is carried out under the control of a computer; the air inlet attack angles of each vane circulating part are all kept within a range that Delta is equal to 2 to 5 degrees and the floating loss of the inside of a vane channel is led to the minimum by changing the rotating speed of a compressor by frequency conversion technology and carrying out adjusting on the guide vane of an inlet and a downstream still vane by a controllable adjusting device under the working situation of a new rotating speed; simultaneously, the compressing system can run stably at low flow rate range under the condition that a pressure ratio is maintained to be unchanged; besides, the area for stable running of a machine set is expanded by the diagnosing and capturing measures on a surge inception.
Description
technical field [0001] The invention relates to the technical field of fluid transportation, and is a new energy-saving and efficiency-enhancing method for blade-type fluid machinery, which is used in industries such as chemical industry, power generation, metallurgy, electric power, transportation, and textiles. Background technique [0002] As we all know, in my country's basic industrial fields (chemical industry, power generation, metallurgy, electric power, transportation, textile, etc.), there are a large number of fluid conveying machines with blades (axial flow, centrifugal, and a mixture of the two) as the aerodynamic structural elements. Includes gas compressors, ventilators, blowers, and compressors. The power, pressure ratio, and flow coverage of this type of gas delivery device basically cover the entire industrial application field. From computer chip fans to multi-stage compressor groups in large steelmaking enterprises is a strong evidence, and most of them di...
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IPC IPC(8): F04D29/66F04D27/00F04D29/46
Inventor 聂超群朱俊强张宏武
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI