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今日新聞            日期：2022/9/17

燃?xì)鉄嶂捣譃?span style="font-size: 16px; color: rgb(204, 0, 0);">高位熱值和低位熱值：

1）高位熱值是指規(guī)定量的氣體燃燒，所生成的水蒸汽冷凝成水而釋放出的熱量。

2）低位熱值是指規(guī)定量的氣體燃燒，燃燒產(chǎn)物的溫度與天然氣初始溫度相同，所生成的水蒸汽保持氣相，而釋放出的熱量。

燃?xì)獾母摺⒌臀粺嶂低ǔＯ嗖顬?0%左右。燃?xì)馊紵龝r(shí)要產(chǎn)生水蒸氣，這些水蒸氣要冷卻到燃燒前的燃?xì)鉁囟葧r(shí)，不但要放出溫差間的熱量，而且要放出水蒸氣的冷凝熱，所以，高位熱值減去水蒸氣的冷凝熱就是低位熱值。在實(shí)際燃燒時(shí)，水蒸氣并沒(méi)有冷凝，冷凝熱得不到利用，這是影響通過(guò)實(shí)驗(yàn)的形式測(cè)定熱值的重要因素。

日本和大多數(shù)北美國(guó)家習(xí)慣于使用燃?xì)獾母呶粺嶂?，我?guó)和大多數(shù)歐洲國(guó)家習(xí)慣于用低位熱值。

燃?xì)鉄嶂道碚撋峡梢杂糜谒械目扇細(xì)怏w，但實(shí)際上更多地用于人工煤氣、天然氣和管道液化石油氣領(lǐng)域，是城市燃?xì)夥治鲋械闹匾笜?biāo)。隨著西氣東輸工程的快速拓展，燃?xì)鉄嶂抵笜?biāo)也正在成為重要的民生指標(biāo)。

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英文翻譯：

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The heating value of gas is divded into high heating value and low heating value:

1)The high calorific value refers to the heat released when the specified gas is completely burned and the generated water vapor is completely condensed into water.

2)Low calorific value refers to the total combustion of specified gas, the temperature of combustion products is the same as the initial temperature of natural gas, the generated water vapor remains in the gas phase,ａnd the heat released.

The difference between high and low heating value of gas is usually about 10%.Gas combustion to produce water vapor,these water vapor to cool to the temperature of the gas before combustion, not only to release the heat between the temperature difference, but also to release the condensation heat of water vapor,therefore,the high calorific value minus the condensation heat of water vapor is the low calorific value.In the actual combustion,water vapor does not condense,condensing heat can not be used, which is an important factor affecting the calorific value measured in the form of experiments.

Japan and most North American countries are used to using high calorific value of gas,ａnd our country and most European countries are used to using low calorific value.

Calorific value of gas can be used for all combustible gases in theory, but in practice it is more used in artificaial gas, natural gas and pipeline liquefied petroleum gas, which is an importat index in urban gas analysis.With the rapid expansion of the West-east gas transmission project, the calorific value index of gas is becoming an important livelihood index.