孔板流量計量表在瓦斯混合氣體中的應用

發布：2018-12-18 | 點擊：人次

摘要：孔板流量計量表在瓦斯混合氣體中的應用資訊由優秀的流量計、流量儀生產報價廠家為您提供。ZK標準孔板是測量流量的差壓發生裝置，配合各種差壓計或差壓變送器可測量管道中各種流體的流量。孔板流量計節流裝置包括環室孔板，噴嘴等。孔板流量計節流裝置與差壓變送器或。更多的流量計廠家選型號價格報價歡迎您來電咨詢，下面是孔板流量計量表在瓦斯混合氣體中的應用文章詳情。

ZK標準孔板是測量流量的差壓發生裝置，配合各種差壓計或差壓變送器可測量管道中各種流體的流量。孔板流量計節流裝置包括環室孔板，噴嘴等。孔板流量計節流裝置與差壓變送器或者U型壓力計配套使用，可測量液體、蒸汽、氣體的流量，因此孔板流量計廣泛應用于石油、化工、冶金、電力、輕工等部門。

充滿管道的流體，當它們流經管道內的節流裝置時，流束將在節流裝置的節流件處形成局部收縮，從而使流速增加，靜壓力低，于是在節流件前后便產生了壓力降，即壓差，介質流動的流量越大，在節流件前后產生的壓差就越大，所以孔板流量計可以通過測量壓差來衡量流體流量的大小。這種測量方法是以能量守衡定律和流動連續性定律為基準的。

智能節流裝置（孔板流量計）是集流量、溫度、壓力檢測功能于一體，并能進行溫度、壓力自動補償的新一代流量計，該孔板流量計采用先進的微機技術與微功耗新技術，功能強，結構緊湊，操作簡單，使用方便。

二、特點

▲孔板流量計節流裝置結構易于復制，簡單、牢固，性能穩定可靠，使用期限長，價格低廉。

▲孔板計算采用國際標準與加工

▲孔板流量計應用范圍廣，全部單相流皆可測量，部分混相流亦可應用。

▲標準型節流裝置無須實流校準，即可投用。

▲一體型孔板流量計安裝更簡單，無須引壓管，可直接接差壓變送器和壓力變送器。

智能型孔板流量計特點

▲采用進口單晶硅智能差壓傳感器

▲高精度，完善的自診斷功能

▲智能孔板流量計智能孔板流量計其量程可自編程調整。

▲智能孔板流量計可同時顯示累計流量、瞬時流量、壓力、溫度。

▲具有在線、動態全補償功能外，智能孔板流量計還具有自診斷、自行設定量程。

▲配有多種通訊接口

▲穩定性高

▲量程范圍寬、大于10：1

智能型孔板流量計技術指標

▲高精度：±0.075%

▲高穩定性：優于0.1%FS/年

▲高靜壓：40MPa

▲連續工作5年不需調校

▲可忽略溫度、靜壓影響

▲抗高過壓

“瓦斯”是一種有毒的混合氣體，主要含有甲烷和一氧化碳兩種氣體，常產生在礦井之中，如遇明火，即可燃燒，發生“瓦斯”爆炸，直接威脅著礦工的生命安全。因此，礦井工作對“瓦斯”十分重視，除去采取一些必要的安全措施外，有的礦工會提著一個裝有金絲雀的鳥籠下到礦井，把鳥籠掛在工作區內。原來，金絲雀對“瓦斯”或其他毒氣特別敏感，只要有非常淡薄的“瓦斯”產生，對人體還遠不能有致命作用時，金絲雀就已經失去知覺而昏倒。礦工們察覺到達種情景后，可立即撤出礦井，避免傷亡事故的發生。

在測量瓦斯混合氣體的流量時不能用帶電源的流量儀表測量，因此在選擇流量計測量時就必須了解瓦斯混合氣體的特性。

什么是瓦斯？

瓦斯，說起它的另外一個名稱沼氣，可能大多數人就會明白許多。其實它是來自英文和俄文的不規范發音。Gas的原意就是氣體，包括各種可燃和不可燃氣體。瓦斯的主要成分是甲烷，它的化學元素符號是CH4，一種無毒、無味、無顏色，可以燃燒的氣體。生活中廣泛用來燒水，做飯，也可以用作照明。

在煤礦里它從煤巖裂縫中噴出。礦井瓦斯爆炸是一種熱一鏈式反應（也叫鏈鎖反應）。當爆炸混合物吸收一定能量（通常是引火源給予的熱能）后，反應分子的鏈即行斷裂，離解成兩個或兩個以上的游離基（也叫自由基）。這類游離基具有很大的化學活性，成為反應連續進行的活化中心。在適合的條件下，每一個游離基又可以進一步分解，再產生兩個或兩上以上的游離基。這樣循環不已，游離基越來越多，化學反應速度也越來越快，zui后就可以發展為燃燒或爆炸式的氧化反應。所以，瓦斯爆炸就其本質來說，是一定濃度的甲烷和空氣中度作用下產生的激烈氧化反應。的氧氣在一定溫度作用下產生的激烈氧化反應。

瓦斯爆炸產生的高溫高壓，促使爆源附近的氣體以極大的速度向外沖擊，造成人員傷亡，破壞巷道和器材設施，揚起大量煤塵并使之參與爆炸，產生更大的破壞力。另外，爆炸后生成大量的有害氣體，造成人員中毒死亡。

用LG系列孔板流量計在測量瓦斯混合氣體時它的差壓通常是用“U”型管壓力計引出瓦斯混合氣體的壓差，再通過人工計算的方法將它的流量計算出來。這是當今國內測量瓦斯呵呵氣體的zui安全zui有效zui常用的方法。因此在選擇孔板流量計時要知道所測量的瓦斯混合氣體的比重，工作溫度，工作壓力，zui大流量，zui小流量等參數。

英文版本：

ZK standard orifice plate is measured flow differential pressure generator, cooperate with all sorts of differential pressure gauge or differential pressure transmitter to measure all kinds of fluid flow in pipes. Orifice flowmeter throttle device including the ring chamber orifice, nozzle, etc. Orifice flowmeter throttle device with differential pressure transmitter or u-shaped pressure gage, can measure the rate of flow of liquid, steam, gas, so the orifice meter is widely used in petroleum, chemical, metallurgical, power, light industry and other departments.

Fluid filled with pipes, when they flow through the pipe of the throttle device, a beam to local contraction at the throttling of the throttle device, so that the flow velocity increases, the static pressure is low, so the throttling parts before and after the pressure drop is produced, the pressure difference, the greater the flow of medium flow, in the front and rear of the throttling parts the greater the pressure difference, so the orifice meter can be measured by the size of the pressure difference to measure fluid flow. This kind of measurement method based on the energy conservation law and the law of flow continuity as a benchmark.

Inligent throttling device （orifice meter） is integrating flow, temperature and pressure detection, temperature, pressure, and can automatically compensate a new generation of flowmeter, the orifice meter adopts the new technology of advanced computer technology and micro power consumption, strong function, compact structure, simple operation, easy to use.

Second, the characteristics of

Bring orifice flowmeter throttle device structure easy to copy, simple, firm, stable and reliable performance, long service life, low price.

Bring orifice calculation adopt international standards and processing

Bring orifice meter wide scope of application, all the single phase flow are measured, partially miscible flow can also be applied.

Bring about standard throttle device without real flow calibration, putting-in-service proactively.

Bring a body orifice meter installation is more simple, do not need to bring pressure tube, can be directly answering the differential pressure transmitter and pressure transmitter.

Inligent orifice meter

Bring imported monocrystalline silicon inligent differential pressure sensor

Bring about high precision, perfect the self-diagnosis function

Bring about inligent orifice plate flowmeter inligent orifice meter range can be adjusted from the programming.

Bring about inligent orifice meter can display at the same time the cumulative flow and transient flow, pressure, temperature.

Bring about have the functions of online, dynamic full compensation, inligent orifice plate flowmeter has since diagnosis, set range.

Bring is equipped with a variety of communication interface

Bring high stability

Bring about wide range range, greater than 10:1

Inligent orifice meter technical indicators

Bring about high precision: plus or minus 0.075%

Bring high stability, better than 0.1% FS/year

Bring high static pressure: 40 mpa

Bring work five years in a row without calibration

Bring negligible temperature, static pressure influence

Bring high resistance overvoltage

"Gas" is a toxic mixture of gases, mainly contain two kinds of methane and carbon monoxide gas, often produced in the mine, in case of fire, burning, can be an explosion, "gas" directly threatened the life safety of the miners. As a result, the mine work to attach great importance to "gas", to remove some necessary security measures, some men carrying a cage with a canary down to the pit, hang cage in the workspace. It turns out that the canary particularly sensitive to "gas" or other gases, as long as there is very weak "gas", is far from a deadly effect to human body, the canary is unconscious but faint. The miners notice arrived at the kind of situation, can immediay withdraw from the mine, avoid the happening of casualty accidents.

When measuring the flow of gas mixture can't use with power flow meter, so when choosing flowmeter measurement must understand the characteristics of the gas mixture.

What is the gas?

Gas, talking about it another name of biogas, probably most people will understand many. Actually it is from English and Russian is not standard pronunciation. Original intention is the Gas Gas, including various combustible and flammable. Gas of main composition is methane, and its chemical element symbol is CH4, a kind of non-toxic, tasess, no color, can burn gas. Life is widely used to boil water, cooking, can also be used for lighting.

It spewed from cracks in coal and rock in coal mine. Mine gas explosion is a kind of hot a chain reaction （also called chain reaction）. When explosive mixture to absorb a certain energy （usually leads from the fire source heat）, after the reaction of molecular chain is broken, dissociation into two or more than two free radicals （also known as free radicals）. This kind of free radical has a lot of chemical activity, become the reaction continuous activation center. Under suitable conditions, each free radicals can be further broken down again, to produce two or more than two free radicals. So circulates, more and more free radicals, chemical reaction rate is becoming more and more fast, finally can develop into the combustion or explosion of oxidation reaction. So, gas explosion in terms of its essence, is a certain concentration of methane and air medium under the action of intense oxidation reaction. Under a certain temperature to produce oxygen oxidation reaction.

Explosive source of high temperature and high pressure gas explosion, prompting nearby gas outward impact at great speed, causing casualties and damage of roadway facilities and equipment, raise a lot of coal dust and participate in the explosion, greater destructive power. In addition, after the explosion to generate a large number of harmful gas, killing people poisoning.

With LG series orifice meter in its differential pressure measurement of a gas mixture is usually use "U" type tube manometer leads to the pressure difference of gas mixture, and its flow calculation by using the method of manual calculation. This is today's domestic measurement of gas well gas of the safest and most effective method of the most commonly used. So when choosing orifice flow timing to know the measured gas mixture proportion, operating temperature, pressure, maximum flow and minimum flow parameters, such as.

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孔板流量計量表在瓦斯混合氣體中的應用