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Method and device for light hydrocarbon gas calorific-value on-line analysis

An analysis method and technology of light hydrocarbons, applied in thermal analysis of materials, analysis materials, measuring devices, etc., can solve the problems of poor adaptability, low precision, high cost, etc., and achieve the effects of low production cost, stable operation, and accurate analysis

Inactive Publication Date: 2009-11-04
刘庆杰
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Their common disadvantages are: 1) the cost is high, the spare parts are expensive, and most of them are imported and introduced from abroad
2) The installation, commissioning, operation and maintenance of the system are complicated and require high requirements for technicians and users
3) The requirements for the application environment are harsh, the explosion-proof and explosion-proof measures are complicated, and it is difficult to ensure safety
4) Analyzing mixed gas containing hydrocarbons by electrochemistry, zirconia and other methods, although the price is low, but the accuracy is low, the adaptability is poor, the operation is unstable, and the sensor probe is easily poisoned and damaged

Method used

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  • Method and device for light hydrocarbon gas calorific-value on-line analysis
  • Method and device for light hydrocarbon gas calorific-value on-line analysis

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Embodiment Construction

[0039]The on-line calorific value analysis method of light hydrocarbon gas is based on a mathematical model in which the density of the mixed gas is equal to the sum of the product of the density of each gas component in the mixed gas and its percentage in the mixed gas. Under the premise of the gas density, according to the known gas density, calculate the mixing ratio of the measured component gas and other component gases in the mixed gas, and calculate the calorific value of light hydrocarbon gas, Wobbe index, specific gravity, density, Oxygen content, mixing ratio value, described mathematical model formula is:

[0040] ρ H = ρ x V x +ρ 1 V 1 +ρ 2 V 2 +...ρ n V n

[0041] If: ρ y = ρ 1 V 1 +ρ 2 V 2 +...ρ n V n

[0042] V y =V 1 +V 2 +...V n

[0043] Then: ρ H = ρ x V x +ρ y V y

[0044] Order: V y = 1-V x

[0045] If: ρ x ρ 1 ρ 2 ……ρ n Known, ρ H Measured.

[0046] Then: V x =(ρ H -ρ y ) / (ρ x -ρ y )

[0047] In the formula: ...

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Abstract

The invention relates to a method and a device for light hydrocarbon gas calorific-value on-line analysis. The method is based on a mathematical model that the density of a mixed gas is equal to the sum of the densities of all gas components in the mixed gas and the percent content of the all gas components in the mixed gas, on the premise that the density of the mixed gas is measured, the mixing ratio between the measured gas components and other gas components in the mixed gas is calculated according to the known gas density, then the light hydrocarbon gas calorific value, the Wobbe-index, the specific weight, the density, the oxygen content and the mixing ratio value are deduced according to the mixing ratio, and the gas density can be accurately measured through a gas density transducing unit; the device has the advantages of stable running, accurate measurement, easy and convenient operation, good security and intelligent measurement; and the method can be applied to an automatic light hydrocarbon gas control system and a portable light hydrocarbon gas calorific-value off-line analysis device and also can perform on-line analysis to the related parameters of the mixed gas of which one component parameter is taken as the variable and other component parameters are taken as the constant.

Description

technical field [0001] The invention relates to an online calorific value analysis method and device for gas, in particular to an online calorific value analysis device for light hydrocarbon gas, which is applied to the calorific value, Wobbe index, specific gravity, density, oxygen content, On-line analysis of mixing ratio. Applying the principle of the invention, it is also possible to conduct on-line analysis of relevant parameters for some mixed gases (such as: LPG+AIR, biogas, coal-derived gas, etc.) in which one component parameter is a variable and the other component parameters are constant. Background technique [0002] The gas calorific value online analysis device is usually called a calorific value meter, which is used in the production, storage, distribution and use of various gases. It is an indispensable device for dynamic evaluation of gas quality, energy measurement and accounting, mixing ratio control, and automatic process control. Generally, calorific v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01N9/36G01N9/24G06F19/00
Inventor 刘庆杰
Owner 刘庆杰
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