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Apparatus and method for measuring calorific value

A measurement method and a technology of a measurement device, which are applied in the field of calorific value measurement devices, can solve problems such as the reduction in the accuracy of the calorific value of fuel gas, and achieve the effect of accurate calorific value

Active Publication Date: 2021-10-22
YAMATAKE HONEYWELL CO LTD
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Problems solved by technology

[0008] However, in the technique for calculating the calorific value from the thermal conductivity described above, if the composition ratio of the fuel gas changes, the accuracy of the calorific value of the fuel gas obtained from the measurement result of the thermal conductivity decreases.

Method used

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  • Apparatus and method for measuring calorific value
  • Apparatus and method for measuring calorific value
  • Apparatus and method for measuring calorific value

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Embodiment Construction

[0025] As a result of intensive research, the inventors conceived of using the change rate of the physical quantity of the fuel gas obtained when the temperature changes to obtain the calorific value with high accuracy because it is necessary to further improve the measurement accuracy. The inventors have found that the rate of change of the first value and the second value due to temperature change is less affected by measurement accuracy and the like, and is useful for improving the accuracy of calorific value estimation. In addition, in the present invention, each measured value is used as an explanatory variable, and the calorific value is used as a target variable to create a calorific value calculation formula. Therefore, in the present invention, it is not necessarily necessary to measure the actual thermal conductivity and thermal diffusivity, and it is sufficient to obtain an index (value) reflecting the actual thermal conductivity and thermal diffusivity with good rep...

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Abstract

Obtain a first value as an index of thermal conductivity and a second value as an index of thermal diffusivity of the fuel gas to be measured at a first temperature, a second temperature, and a third temperature that are different from each other by the measurement unit (101). , use the rate of change calculating part (102) to obtain the temperature change rate κ of the first value between the first temperature and the second temperature measured by the measuring part (101) 1 , the temperature change rate κ of the first value between the second temperature and the third temperature 2 , the temperature change rate α of the second value between the first temperature and the second temperature 1 , the temperature change rate α of the second value between the second temperature and the third temperature 2 , using the calorific value calculation unit (103) to pass κ 1 , κ 2 、α 1 、α 2 As an explanatory variable, the calorific value calculation formula using the calorific value as the target variable calculates the calorific value of the fuel gas.

Description

technical field [0001] The present invention relates to a calorific value measuring device and method, and more particularly to a calorific value measuring device and method for measuring the calorific value of city gas or the like using natural gas as a main raw material. Background technique [0002] For example, city gas is supplied by mixing petroleum gas (PG: Petroleum Gas) with natural gas (NG: Natural Gas) as a raw material and adjusting to a predetermined heat (calorific value). In order to measure the calorific value of such a fuel gas, the most basic method is to burn the fuel gas to measure the calorific value. In addition, the calorie measurement of fuel gas has a method of measuring the calorific value using the relationship between the gas density and the calorific value. In addition, a method of obtaining the calorific value from the thermal conductivity of the fuel gas has also been proposed (see Patent Document 1). [0003] First, the calorific value of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/18
CPCG01N25/18G01N33/225G01N25/20
Inventor 茂木贵弘
Owner YAMATAKE HONEYWELL CO LTD
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