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Application of frequency changing air flow calculation method in inaustrial production

A technology of air flow and calculation method, which is applied in the direction of indirect mass flow meter, calculation, mass flow measurement device, etc., and can solve problems such as inability to express the working characteristics of Roots blower intuitively

Inactive Publication Date: 2004-10-06
李洪伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0034] In the existing air mass flow formulas (1), (2), and (3), the flow rate increases with the increase of the fan compensation pressure P parameter due to the flow signal sampling principle, and the mass flow rate M also increases, but cannot Visually express the original working characteristics of Roots blower

Method used

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  • Application of frequency changing air flow calculation method in inaustrial production
  • Application of frequency changing air flow calculation method in inaustrial production
  • Application of frequency changing air flow calculation method in inaustrial production

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Embodiment Construction

[0036] The frequency conversion air mass M flow expression of the present invention is:

[0037]

[0038] In the formula: K --- the flow display proportional coefficient after setting and correction of the intelligent flow totalizer

[0039] ρ 20 ---Air density at 20°C, take 1.205kg / m 3

[0040] T 0 ---273.15℃

[0041] P A --- Atmospheric pressure at the working point, P A ×10 items can directly take the value of about 1.0133Mpa

[0042] P 0 ---Standard atmospheric pressure 0.10133Mpa

[0043] T---actual air temperature

[0044] F --- fan flow frequency linear parameter, taken from the power supply frequency signal of the fan motor given by the inverter

[0045] P---Fan compensation pressure parameter, the greater the pressure, the smaller the air mass flow M

[0046] P max --- The maximum rated pressure of the fan.

[0047] The fan air mass flow expression in the present invention indicates that the larger the co...

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Abstract

An application of frequency-variable air flow calculating method in industrial production is disclosed, which is suitable for the industrial blower to save energy to maximum. Its calculation equation containing the parameters, pressure, temp conpensation and frequency is also disclosed.

Description

Technical field [0001] The invention provides an air mass flow calculation method without a throttling device, which has a wide range of energy-saving effects in industrial applications. Especially for the formaldehyde chemical production system, it can reduce the outlet resistance of the fan and reduce the load of the fan. Background technique [0002] At present, in the production of chemical products that require air as a raw material composition formula, the air flow rate must be throttled and measured. Commonly used air flow detection methods include throttling methods such as vortex flow, target flow, orifice flow and pressure difference. It is the simplest method to observe the orifice plate flow by using the "U" type glass tube differential pressure gauge, but it is not easy to read, and the fluctuation error is large, and the installation of the orifice plate device increases the resistance of the fan pipeline. Installing vortex flow and target flow sensing device...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/86
Inventor 李洪伟
Owner 李洪伟