JPH0522815B2 - - Google Patents
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- Publication number
- JPH0522815B2 JPH0522815B2 JP27767284A JP27767284A JPH0522815B2 JP H0522815 B2 JPH0522815 B2 JP H0522815B2 JP 27767284 A JP27767284 A JP 27767284A JP 27767284 A JP27767284 A JP 27767284A JP H0522815 B2 JPH0522815 B2 JP H0522815B2
- Authority
- JP
- Japan
- Prior art keywords
- natural gas
- calorific value
- hydrometer
- specific gravity
- gas
- Prior art date
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 142
- 239000003345 natural gas Substances 0.000 claims description 72
- 230000005484 gravity Effects 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 23
- 239000003949 liquefied natural gas Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000006200 vaporizer Substances 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 239000001273 butane Substances 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Feeding And Controlling Fuel (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、小規模な液化天然ガスの気化供給所
において用いるに適した天然ガスの発熱量調整装
置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a natural gas calorific value adjustment device suitable for use in a small-scale liquefied natural gas vaporization supply station.
（従来の技術）
天然ガス（略称NG）は、通常は極低温状態で
液化された液化天然ガス（略称LNG）として貯
蔵され、その消費にあたり必要量が気化器により
常温の天然ガスに再気化されて供給される。(Prior art) Natural gas (abbreviated as NG) is normally stored as liquefied natural gas (abbreviated as LNG) that is liquefied at extremely low temperatures, and the required amount is re-vaporized into room-temperature natural gas using a vaporizer before consumption. will be supplied.
しかして天然ガスはそれぞれ固有の発熱量値を
示す主成分メタン、副成分エタン、プロパン等の
主としてパラフイン系同族体から成る多成分系の
ガスであるため、その発熱量は一定していない。
即ち天然ガスの発熱量は、前記各成分の組成の違
いにより9700〜11200Kcal／Nm3の範囲でバラツ
キがある上に、前記の再気化にあたり、各成分の
沸点の相違や気化器の蒸発管内における液相流
（液化天然ガス流）と気相流（天然ガス流）との
相互干渉に基づく複雑な流動現象により、再気化
された天然ガスの組成がある時間的周期を伴つて
変動し、従つてその発熱量も変動するのである。 However, since natural gas is a multicomponent gas consisting mainly of paraffin homologs such as methane as a main component, ethane as a subcomponent, and propane as a subcomponent, each of which has its own calorific value, its calorific value is not constant.
In other words, the calorific value of natural gas varies in the range of 9,700 to 11,200 Kcal/ Nm3 due to the difference in the composition of each component, and in addition, during the revaporization, there are differences in the boiling point of each component and in the evaporation tube of the vaporizer. Due to complex flow phenomena based on mutual interference between liquid phase flow (liquefied natural gas flow) and gas phase flow (natural gas flow), the composition of revaporized natural gas fluctuates with a certain time period and As a result, its calorific value also fluctuates.
然し一方、天然ガスに対しては、消費時の燃焼
性や取引上等の理由から、特定の標準発熱量（例
えば、都市ガスとして天然ガスを供給する場合の
標準発熱量は11000Kcal／Nm3である。）を示す
ことが要求されており、ここに天然ガスの発熱量
調整を行なう必要が生ずる。 However, due to reasons such as combustibility during consumption and trading, natural gas has a certain standard calorific value (for example, the standard calorific value when supplying natural gas as city gas is 11,000 Kcal/ Nm3 ). ), and it becomes necessary to adjust the calorific value of natural gas.
かかる天然ガスの発熱量調整を行なうための従
来の技術は、いわゆるユンカース型熱量計やシグ
マ型熱量計等のガス熱量計により天然ガスの発熱
量を測定することと、この測定値に基づき適当な
発熱量を有する他種のガスを、天然ガスに対して
混合することにより構成されている。 The conventional technology for adjusting the calorific value of natural gas is to measure the calorific value of natural gas using a gas calorimeter such as a so-called Junkers calorimeter or a sigma calorimeter, and to calculate an appropriate calorific value based on this measured value. It is constructed by mixing other types of gases that have a calorific value with natural gas.
（発明が解決しようとする問題点）
しかし、上記の従来技術では、熱量計の応答速
度が遅く、通常３〜10分間の測定遅れを生ずるた
め、天然ガスの再気化の際の発熱量変動が激しい
ときは、発熱量の調整を追従させることができな
いという問題があつた。そしてこの様な問題は、
大規模な液化天然ガスの気化供給プラントにおい
ては、気化器の運転台数が多いことや、大容量の
プラント内部で組成の異なる天然ガスが混合、平
均されることより、さしたる不都合を生じない
が、この様なスケール・メリツトを期待できない
小規模な液化天然ガスの気化供給プラントにおい
ては、供給される天然ガスの発熱量が標準発熱量
と大きく食い違うという不都合を生じる恐れがあ
つた。(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, the response speed of the calorimeter is slow, resulting in a measurement delay of usually 3 to 10 minutes, resulting in fluctuations in calorific value during revaporization of natural gas. There was a problem that when the temperature was too high, the amount of heat generated could not be adjusted accordingly. And such problems are
In large-scale liquefied natural gas vaporization supply plants, this does not cause any major inconvenience because there are many vaporizers in operation and natural gases with different compositions are mixed and averaged inside the large-capacity plant. In small-scale liquefied natural gas vaporization supply plants where such merits of scale cannot be expected, there is a risk that the calorific value of the supplied natural gas may differ greatly from the standard calorific value.
ところで、天然ガスにおいては、前記の組成上
の特徴より、その発熱量（高位発熱量Kcal／
Nm3）をＨ、その比重（空気の比重を１とした
場合。本明細書において、以下同じ）をρとする
と、第４図に示す様に、Ｈ＝14559×ρ＋1473（第
一式）で示される相関性が成立することが知られ
ており、又、ガス体の比重を測定するための比重
計、例えばいわゆるラウター比重計においては、
その応答性が熱量計に比し良好で、サンプリング
タイムも含めて通常数十秒の遅れで連続的に測定
を行なうことができることも知られている。 By the way, due to the above-mentioned compositional characteristics of natural gas, its calorific value (higher calorific value Kcal/
Nm 3 ) is H, and its specific gravity (assuming the specific gravity of air is 1; hereinafter the same) is ρ, then as shown in Figure 4, H = 14559 x ρ + 1473 (Equation 1). It is known that the following correlation holds true, and in a hydrometer for measuring the specific gravity of a gas, such as a so-called Lauter hydrometer,
It is also known that its responsiveness is better than that of a calorimeter, and that measurements can be carried out continuously with a delay of usually several tens of seconds, including the sampling time.
従つて、比重計により天然ガスの比重を測定し
て、この測定値を指標として天然ガスの発熱量を
調整する方式とすれば、天然ガスの発熱量変動に
対する追従性をある程度向上させることができる
が、この場合でも、前記の様に比重計における数
十秒程度の測定遅れに基づく調整の誤差を生ずる
ことを避け得ない。 Therefore, if the specific gravity of natural gas is measured using a hydrometer and the calorific value of natural gas is adjusted using this measured value as an index, it is possible to improve the ability to follow fluctuations in the calorific value of natural gas to some extent. However, even in this case, it is unavoidable that an adjustment error will occur due to the measurement delay of several tens of seconds in the hydrometer as described above.
そこで本発明は、比重計により比重を測定され
た天然ガスが比重計の測定遅れに対応する時間だ
け待機させられた後、発熱量の調整を受けるよう
にすることと、更に、待機中の相異なる組成の天
然ガスを混合、平均化して、調整すべき発熱量の
変動幅を少なくしておくことを、その解決すべき
技術的課題とする。 Accordingly, the present invention provides that the natural gas whose specific gravity is measured by a hydrometer is made to stand by for a time corresponding to the measurement delay of the hydrometer, and then undergoes adjustment of the calorific value, and furthermore, The technical problem to be solved is to mix and average natural gases of different compositions to reduce the fluctuation range of the calorific value to be adjusted.
（問題点を解決するための手段）
上記課題を解決するための技術的手段は、天然
ガスの流路に設けた比重計により該天然ガスの発
熱量に対応する天然ガスの比重を測定し、この測
定値に基づいて、標準発熱量に対する天然ガスの
発熱量の過不足を、天然ガスの流路に設けた発熱
量調整手段を有する調整部において調整する発熱
量調整装置において、前記比重計と調整部との間
の流路に天然ガスの撹拌手段を備えた所定容量の
ミキシングタンクを設けると共に、比重計に接続
された演算器には比重計から順次入力される比重
測定値に基づきミキシングタンク内で撹拌、混合
された天然ガスの比重を予測演算するシミユレー
シヨンプログラムを設定し、この予測演算値に基
づいて調整部を制御するようにしたことである。(Means for solving the problem) A technical means for solving the above problem is to measure the specific gravity of natural gas corresponding to the calorific value of the natural gas using a hydrometer installed in the natural gas flow path, Based on this measured value, the calorific value adjusting device adjusts the excess or deficiency of the calorific value of natural gas with respect to the standard calorific value in an adjustment section having a calorific value adjusting means provided in the natural gas flow path. A mixing tank with a predetermined capacity equipped with a natural gas stirring means is installed in the flow path between the adjustment unit and the mixing tank is connected to a calculator connected to the hydrometer based on the specific gravity measurement values sequentially input from the hydrometer. A simulation program is set up to predict and calculate the specific gravity of the natural gas that is stirred and mixed inside, and the adjustment section is controlled based on this predicted calculation value.
（作 用）
気化器により気化された、発熱量の変動に対応
する比重の変動を伴つた天然ガスが、その流路に
設けられた比重計により連続的にその比重を測定
された後、順次ミキシングタンクに流入して撹
拌、混合される。そして、ミキシングタンクに流
入した前記天然ガスは、ミキシングタンクが所定
の容量を有するために、少なくとも前記比重計の
測定遅れに対応する時間だけ、ミキシングタンク
内に滞留する。(Function) After the specific gravity of the natural gas, which is vaporized by the vaporizer and whose specific gravity fluctuates corresponding to the variation in calorific value, is continuously measured by a hydrometer installed in the flow path, the natural gas is It flows into the mixing tank and is stirred and mixed. Since the mixing tank has a predetermined capacity, the natural gas that has flowed into the mixing tank remains in the mixing tank for at least a time corresponding to the measurement delay of the hydrometer.
この間、比重計による比重測定値は一定時間の
測定遅れを伴つて演算器に連続的に入力される。
そして演算器はこれらの比重測定値に基づいて、
ミキシングタンク内で混合された後の天然ガスの
比重を予測演算すると共に、この演算値に基づい
て調整部に対して制御指令を送る。 During this time, the specific gravity measured by the hydrometer is continuously input to the calculator with a measurement delay of a certain period of time.
Then, the calculator calculates based on these specific gravity measurements,
The specific gravity of the natural gas after being mixed in the mixing tank is predicted and calculated, and a control command is sent to the adjustment unit based on this calculated value.
すると、ちようどこの時点で、前記演算値に対
応する天然ガスがミキシングタンクより流出して
調整部に到達しているので、この天然ガスに対し
演算値に基づく発熱量調整が行なわれるのであ
る。 Then, at this point, the natural gas corresponding to the calculated value has just flowed out of the mixing tank and reached the adjustment section, so the calorific value adjustment is performed for this natural gas based on the calculated value. .
（実施例）
次に、本発明の実施例を第１図乃至第３図に基
づいて説明する。(Example) Next, an example of the present invention will be described based on FIGS. 1 to 3.
タンク１に貯蔵された液化天然ガスは、ポンプ
２によつて気化器３に送られると共に、ここで気
化された後、供給管４を通つてミキシングタンク
５に流入するようになつている。 The liquefied natural gas stored in the tank 1 is sent to a vaporizer 3 by a pump 2, and after being vaporized there, flows into a mixing tank 5 through a supply pipe 4.
ミキシングタンク５は所定の容量、即ち、少な
くとも後述する比重計１９の測定遅れに対応する
時間だけ、流入した天然ガスを滞留させることが
できる容量を有している。ミキシングタンク５の
内部に導入された前記供給管４は単数又は複数の
分枝管６に接続され、分枝管６はミキシングタン
ク５内部のガス体に対し均一に撹拌作用を及ぼす
に適当な位置まで延設されている。そして分枝管
６の先端部には、該分枝管６を小口径に絞り込ん
で形成したノズル７と、該ノズル７の開口縁部を
一定の間隔を保つて包囲するように設けられた先
細状のミキシングリング８とより構成されるエジ
エクター９を形成している。又、エジエクター９
によるガス体の導入方向から外れた部位におい
て、ミキシングタンク５に導出口１０を設けてい
る。 The mixing tank 5 has a predetermined capacity, that is, a capacity capable of retaining the inflowing natural gas for at least a time corresponding to a measurement delay of the hydrometer 19, which will be described later. The supply pipe 4 introduced into the mixing tank 5 is connected to one or more branch pipes 6, and the branch pipes 6 are located at appropriate positions to uniformly stir the gas inside the mixing tank 5. It has been extended to At the tip of the branch pipe 6, there is a nozzle 7 formed by narrowing the branch pipe 6 to a small diameter, and a tapered part provided so as to surround the opening edge of the nozzle 7 at a constant interval. An ejector 9 is formed with a mixing ring 8 having a shape of 1. Also, ejector 9
An outlet port 10 is provided in the mixing tank 5 at a location away from the direction in which the gas body is introduced.
次に、前記導出口１０に一端を接続した供給管
１１の他端部には天然ガスの発熱量を調整するた
めの調整部１２を設けている。この調整部１２
は、流量調節弁１３を介して増熱用ガスを送る供
給管１４と、流量調節弁１５を介して希釈用ガス
を送る供給管１６とを混合部１７において前記供
給管１２に接続して成つている。そして混合部１
７からは、熱量調整済の天然ガスを図示省略の供
給口へ送るための供給管１８を延設している。 Next, an adjustment section 12 for adjusting the calorific value of natural gas is provided at the other end of the supply pipe 11, one end of which is connected to the outlet 10. This adjustment section 12
is formed by connecting a supply pipe 14 that sends heating gas through a flow rate control valve 13 and a supply pipe 16 that sends dilution gas through a flow rate control valve 15 to the supply pipe 12 in a mixing section 17. It's on. and mixing section 1
A supply pipe 18 extends from 7 for sending natural gas whose calorific value has been adjusted to a supply port (not shown).
しかして、上記の増熱用ガスとは、天然ガスよ
り高い一定の発熱量を示すガス、例えばプロパン
ガス或いはブタンガスである。因みに、ブタンガ
スにおいては、その発熱量は31920Kcal／Nm3で
ある。又、希釈用ガスとは、天然ガスより低い一
定の発熱量を示し、若しくは発熱量ゼロであるガ
ス、例えば空気或いは水素ガスである。 The heating gas mentioned above is a gas that exhibits a certain calorific value higher than that of natural gas, such as propane gas or butane gas. Incidentally, the calorific value of butane gas is 31,920 Kcal/ Nm3 . Further, the diluting gas is a gas that exhibits a certain calorific value lower than that of natural gas, or has no calorific value, such as air or hydrogen gas.
前記天然ガスの供給管４には比重計１９が、又
供給管１１には流量計２０が設けられ、これらの
測定値が入力される演算器２１により前記流量調
節弁１３，１５の開度が制御される様になつてい
る。又、演算器２１には比重計１９より順次入力
される比重測定値に基づき、ミキシングタンク５
内部で撹拌混合された天然ガスの比重を予測演算
するシユミレーシヨンプログラムが入れてある。 The natural gas supply pipe 4 is provided with a hydrometer 19, and the supply pipe 11 is provided with a flowmeter 20, and the opening degrees of the flow rate control valves 13, 15 are determined by a calculator 21 into which these measured values are input. It's starting to be controlled. Further, the mixing tank 5
A simulation program is included to predict and calculate the specific gravity of the natural gas that is stirred and mixed inside.
尚、ミキシングタンク５における撹拌手段とし
て、前記エジエクター９に代えて撹拌用のプロペ
ラを備えていても良い。又、前記比重計１９は、
熱量計に比し測定遅れが少ないガス比重計であれ
ば、その機構、種類を問わない。 Incidentally, as the stirring means in the mixing tank 5, a propeller for stirring may be provided instead of the ejector 9. Further, the hydrometer 19 is
As long as the gas hydrometer has less measurement delay than a calorimeter, its mechanism and type do not matter.
本実施例は以上の様に構成されるので、以下の
作用を有する。 Since this embodiment is configured as described above, it has the following effects.
タンク１に貯蔵された液化天然ガスはポンプ２
により気化器３に送られ、ここで気化されて天然
ガスとなる。この天然ガスは供給管４を通過中に
比重計１９によりその比重を連続的に測定され、
次いで分枝管６を通過してノズル７よりミキシン
グタンク５内部に噴出する。そして、この様な天
然ガスの噴出がミキシングリング８の内部に負圧
を生じさせるため、エジエクター９の近傍部の、
既にミキシングタンク５に導入されていた天然ガ
スが第３図の矢印Ａで示す方向よりエジエクター
９に吸引され、ノズル７より噴出する前記天然ガ
スと混合されながら第３図の矢印Ｂで示す方向へ
吹出される。又、この様な天然ガスの流れがミキ
シングタンク５の内部における天然ガスの対流、
混合を引き起し、この結果天然ガスの組成が平均
化される。 The liquefied natural gas stored in tank 1 is pumped to pump 2.
The gas is sent to the vaporizer 3, where it is vaporized and becomes natural gas. The specific gravity of this natural gas is continuously measured by a hydrometer 19 while passing through the supply pipe 4,
Then, it passes through the branch pipe 6 and is ejected from the nozzle 7 into the mixing tank 5 . Since such a jet of natural gas generates negative pressure inside the mixing ring 8, the area near the ejector 9,
The natural gas that has already been introduced into the mixing tank 5 is sucked into the ejector 9 in the direction shown by arrow A in FIG. 3, and is mixed with the natural gas jetted from the nozzle 7 in the direction shown by arrow B in FIG. 3. It's blown out. Moreover, such a flow of natural gas causes convection of natural gas inside the mixing tank 5,
This causes mixing so that the composition of the natural gas is averaged.
又、エジエクター９と導出口１０との前記の位
置関係から、ノズル７より噴出した天然ガスは、
直ちに導出口１０へ向うことはなく、ミキシング
タンク５の容量に対応する所定の時間だけミキシ
ングタンク５の内部に滞留する。 Also, from the above-mentioned positional relationship between the ejector 9 and the outlet 10, the natural gas ejected from the nozzle 7 is
It does not immediately go to the outlet 10, but stays inside the mixing tank 5 for a predetermined time corresponding to the capacity of the mixing tank 5.
一方演算器２１は、比重計１９より順次入力さ
れる天然ガスの比重測定値に基づいて、前記のシ
ミユレーシヨンプログラムにより、ミキシングタ
ンク５の内部で組成が平均化された天然ガスの比
重を予測演算し、この演算値に基づく制御指令を
調整部１２に送る。この制御指令の内容は、天然
ガスの標準発熱量に対応する比重値に対する前記
演算値の過不足に応じて、流量調節弁１５或いは
１３を所要時間、所要の開度だけ開かせ、増熱用
ガス或いは希釈用ガスを混合部１７に択一的に所
要量供給することより成つている。 On the other hand, the calculator 21 calculates the specific gravity of the natural gas whose composition has been averaged inside the mixing tank 5 by the simulation program, based on the measured specific gravity values of the natural gas sequentially inputted from the hydrometer 19. A predictive calculation is performed, and a control command based on this calculated value is sent to the adjustment section 12. The content of this control command is to open the flow control valve 15 or 13 by the required opening degree for the required time, depending on whether the calculated value is over or under the specific gravity value corresponding to the standard calorific value of natural gas. This consists of supplying a required amount of gas or diluting gas to the mixing section 17 alternatively.
然るに、前記の様に、比重計１９における測定
遅れの時間と、ミキシングタンク５における天然
ガスの滞留時間とが対応する様に設計されている
ので、ミキシングタンク５において組成を平均化
された天然ガスが供給管１１より混合部１７に到
達した時点で、この天然ガスに対応する比重の演
算値に基づく制御指令により混合部１７に増熱用
ガス或いは希釈用ガスが供給されて天然ガスに混
合されるので、比重計１９の測定遅れに伴う誤差
を生ずることなく、天然ガスの発熱量調整が行な
われるのである。 However, as described above, since the design is such that the measurement delay time in the hydrometer 19 corresponds to the residence time of natural gas in the mixing tank 5, the natural gas whose composition has been averaged in the mixing tank 5 is When the natural gas reaches the mixing section 17 from the supply pipe 11, heat-increasing gas or dilution gas is supplied to the mixing section 17 according to a control command based on the calculated value of the specific gravity corresponding to this natural gas, and is mixed with the natural gas. Therefore, the calorific value of natural gas can be adjusted without causing errors due to measurement delays of the hydrometer 19.
尚、供給管１１に設けられた流量計２０により
天然ガスの流量、換言すれば、その移動速度が検
出され、この測定値が演算器２１に入力されて、
調整部への前記制御指令を発するタイミングの微
調整が行なわれる。 Incidentally, the flow rate of natural gas, in other words, its movement speed is detected by a flow meter 20 provided in the supply pipe 11, and this measured value is inputted to a calculator 21,
The timing of issuing the control command to the adjustment section is finely adjusted.
（効 果）
本発明は、天然ガスの発熱量の変動に対する発
熱量調整の追従性を向上させると共に比重計の測
定遅れに基づく調整の誤差を解消でき、又、予め
天然ガスの組成が平均化されるため発熱量の変動
幅が少なく、よつて正確な調整を行ない易いとい
う効果がある。(Effects) The present invention improves the followability of the calorific value adjustment to fluctuations in the calorific value of natural gas, eliminates adjustment errors due to measurement delays of hydrometers, and also enables the composition of natural gas to be averaged in advance. Therefore, there is an effect that the range of variation in the amount of heat generated is small, and therefore accurate adjustment is easy to perform.
第１図は本発明の概念図、第２図はミキシング
タンクの様式図、第３図はその要部拡大図、第４
図は天然ガスにおける発熱量と比重との相関性を
示すグラフである。
５…ミキシングタンク、１２…調整部、１９…
比重計、２１…演算器。
Figure 1 is a conceptual diagram of the present invention, Figure 2 is a style diagram of the mixing tank, Figure 3 is an enlarged view of its main parts, and Figure 4 is a conceptual diagram of the present invention.
The figure is a graph showing the correlation between calorific value and specific gravity in natural gas. 5...Mixing tank, 12...Adjustment section, 19...
Hydrometer, 21...Arithmetic unit.
Claims (1)
ガスの発熱量に対応する天然ガスの比重を測定
し、この測定値に基づいて、標準発熱量に対する
天然ガスの発熱量の過不足を、天然ガスの流路に
設けた発熱量調整手段を有する調整部において調
整する発熱量調整装置において、前記比重計と調
整部との間の流路に天然ガスの撹拌手段を備えた
所定容量のミキシングタンクを設けると共に、比
重計に接続された演算器には比重計から順次入力
される比重測定値に基づきミキシングタンク内で
撹拌、混合された天然ガスの比重を予測演算する
シミユレーシヨンプログラムを設定し、この予測
演算値に基づいて調整部を制御するようにしたこ
とを特徴とする天然ガスの発熱量調整装置。1. Measure the specific gravity of natural gas corresponding to the calorific value of the natural gas with a hydrometer installed in the natural gas flow path, and based on this measurement, determine whether the calorific value of natural gas is excessive or insufficient relative to the standard calorific value. In a calorific value adjustment device that adjusts in an adjustment section having a calorific value adjustment means provided in a natural gas flow path, a predetermined capacity mixing device is provided with a natural gas stirring means in the flow path between the hydrometer and the adjustment section. In addition to installing a tank, a calculation unit connected to the hydrometer is equipped with a simulation program that predicts and calculates the specific gravity of the natural gas stirred and mixed in the mixing tank based on the specific gravity measurements sequentially input from the hydrometer. A calorific value adjusting device for natural gas, characterized in that the adjustment unit is controlled based on the predicted calculated value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27767284A JPS61159143A (en) | 1984-12-29 | 1984-12-29 | Adjusting device for calorific value of natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27767284A JPS61159143A (en) | 1984-12-29 | 1984-12-29 | Adjusting device for calorific value of natural gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61159143A JPS61159143A (en) | 1986-07-18 |
| JPH0522815B2 true JPH0522815B2 (en) | 1993-03-30 |
Family
ID=17586689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27767284A Granted JPS61159143A (en) | 1984-12-29 | 1984-12-29 | Adjusting device for calorific value of natural gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61159143A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012021837A (en) * | 2010-07-13 | 2012-02-02 | Yokogawa Electric Corp | Liquefaction natural gas heat quantity calculation system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4890874B2 (en) * | 2006-02-10 | 2012-03-07 | 株式会社山武 | Calorie measurement system |
| JP2007277346A (en) * | 2006-04-04 | 2007-10-25 | Ishikawajima Plant Construction Co Ltd | City gas supply equipment |
| GB0823168D0 (en) * | 2008-12-18 | 2009-01-28 | Bp Exploration Operating | Fluid transmission control system and method |
| JP6845413B2 (en) * | 2016-08-23 | 2021-03-17 | 東京電力ホールディングス株式会社 | Combustion control method |
| CN108253294A (en) * | 2017-12-29 | 2018-07-06 | 上海新奥新能源技术有限公司 | A kind of liquefied natural gas supplying system |
-
1984
- 1984-12-29 JP JP27767284A patent/JPS61159143A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012021837A (en) * | 2010-07-13 | 2012-02-02 | Yokogawa Electric Corp | Liquefaction natural gas heat quantity calculation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61159143A (en) | 1986-07-18 |
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