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Centrifugal compressor variable speed energy conservation control method based on generalized flow-speed mathematical model

A technology of centrifugal compressors and mathematical models, applied in pump control, mechanical equipment, non-variable pumps, etc.

Active Publication Date: 2017-12-08
北京凯德中天科技发展有限公司
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  • Description
  • Claims
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Problems solved by technology

[0008] There are no published publications, documents or information on the centrifugal compressor variable speed energy-saving control method based on the general flow-speed mathematical model

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  • Centrifugal compressor variable speed energy conservation control method based on generalized flow-speed mathematical model
  • Centrifugal compressor variable speed energy conservation control method based on generalized flow-speed mathematical model
  • Centrifugal compressor variable speed energy conservation control method based on generalized flow-speed mathematical model

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Embodiment Construction

[0029] At present, in the application of variable speed operation of the compressor, the main theoretical basis is the compressor characteristic curve equation (2), the pipe network characteristic curve equation (3) and the proportional law equation (4), (5), (6).

[0030]

[0031]

[0032]

[0033]

[0034]

[0035] In the formula:

[0036] h 1 : current pressure of the compressor system, kPa

[0037] a, b, c: constants

[0038] S e : pipe network friction at rated flow

[0039] no 1 : compressor speed target value, rpm or Hz

[0040] Q 1 : current flow rate of compressor, m 3 / s

[0041] Q e : Compressor rated flow, m 3 / s

[0042] h e : Compressor system rated pressure, kPa

[0043] no e : Compressor rated speed, rpm or Hz

[0044] h st : Net pressure of the compressor system, kPa

[0045] N 1 : Operating power, kW

[0046] N e : rated power, kW

[0047] For a specific compressor, a, b, and c are constants obtained after fitting according...

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Abstract

The invention relates to a centrifugal compressor variable speed energy conservation control method based on a generalized flow-speed mathematical model, and belongs to the field of compressor variable speed energy conservation and related technologies. The flow-speed mathematical model matched with the operation condition of a compressor is researched and developed according to the operation characteristics of the compressor, so that the control over the dynamic speed of the compressor. The key points of the invention lie in that the influence of static pressure variation on the relationship between the flow and the revolving speed is researched, the variable speed range of the compressor is researched, the generalized flow-speed mathematical model of the compressor is established according to the physical characteristics of the variable speed operation condition of the compressor, the problem that the variable speed control of the compressor is short of theoretical foundation is solved, a compressor system variable speed dynamic controller and a speed regulation device are utilized, so that a compressor variable speed energy conservation control system is constructed, deep-layer and fine closed-loop dynamic energy conservation control is realized, and the variable speed energy conservation control method can be extensively applied to various newly constructed or reconstructed centrifugal compressor variable speed control systems.

Description

technical field [0001] The invention belongs to variable speed energy saving of compressors and related technologies. Background technique [0002] Centrifugal compressors belong to square torque load equipment, but they are also somewhat different from ordinary fan equipment. Since the centrifugal compressor system is usually equipped with an air storage tank or operates under the pressure of the main pipe, there is back pressure. Its status is like the net head of the pump system, which is collectively referred to as the net pressure below. In this case, variable speed energy saving control is more complicated than fan system. Especially due to the existence of the net pressure of the centrifugal compressor system, the proportional law that is also applicable to the power frequency operation of the fan and compressor is not applicable to the variable speed operation of the compressor. However, there is still a lack of necessary theoretical basis and related application t...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/001F04D27/004
Inventor 高毅夫
Owner 北京凯德中天科技发展有限公司
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