JP2009034618A - Numerical analysis method of oil-water separation phenomenon - Google Patents
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Abstract
【課題】油水分離設備のセトラ部において、オイラー法に油水中の水相の体積分率に比例して水滴の粒径を変化させ、その粒径に対する油水相間の相関力を考慮して、油相と水相の各々の局所の流動や体積分率といった分離挙動を予測する数値解析方法を提供する。
【解決手段】油水分離設備のセトラ部１において、油相９を連続相とし、水相８を分散相とした混相流の数値解析に際して、水相８の水滴の粒径を油水７中の水相８の体積分率に比例して変化させ、その粒径に対する油相９と水相８と間の相互相関力を考慮して、油水７の分離現象を予測するか、または水相８を連続相とし、油相９を分散相とした混相流の数値解析に際して、油相９の油滴の粒径を油水７中の油相９の体積分率に比例して変化させ、その粒径に対する油相９と水相８との間の相互相関力を考慮して、油水７の分離現象を予測する。
【選択図】図４[PROBLEMS] To change oil droplet size in proportion to the volume fraction of an aqueous phase in oil water by the Euler method in the Setra section of an oil / water separation facility, and to take into account the correlation force between the oil and water phases with respect to the particle size. A numerical analysis method for predicting separation behavior such as local flow and volume fraction of each phase and water phase is provided.
In a setra section of an oil / water separation facility, in a numerical analysis of a multiphase flow in which an oil phase is a continuous phase and a water phase is a dispersed phase, the particle size of water droplets in the water phase is determined by the water in the oil water. Change in proportion to the volume fraction of the phase 8, and take into account the cross-correlation force between the oil phase 9 and the water phase 8 with respect to the particle size, or predict the separation phenomenon of the oil water 7 or In the numerical analysis of the mixed phase flow in which the oil phase 9 is the dispersed phase, the oil droplet size of the oil phase 9 is changed in proportion to the volume fraction of the oil phase 9 in the water 7 In consideration of the cross-correlation force between the oil phase 9 and the water phase 8 against the oil, the separation phenomenon of the oil water 7 is predicted.
[Selection] Figure 4
Description
本発明は、油水分離設備において、油水分離現象を予測する数値解析方法に関する。 The present invention relates to a numerical analysis method for predicting an oil / water separation phenomenon in an oil / water separation facility.
ミキサセトラで代表されるような油水分離設備において、油水分離設備内のセトラ部や配管等の各パーツ毎に、オブジェクト型ソフトウェアを用い、物質収支計算や平衡濃度計算を行って、各パーツ単位の分離性能をシミュレーションする計算手法、いわゆるプロセスシミュレーションについては、例えば特許文献１に見られるように公知となっているものの、各パーツの内部を要素分割し、流動解析を行い、パーツ内部の油相と水相の局所の流動や、分離挙動を予測するための適切な解析手法は、まだ提案されていない。 In oil-water separation equipment such as mixer-settler, each part of the oil-water separation equipment, such as the setra section and piping, is divided into parts by calculating the material balance and equilibrium concentration using object type software. Although a calculation method for simulating performance, so-called process simulation, is known as shown in, for example, Patent Document 1, the interior of each part is divided into elements, the flow analysis is performed, and the oil phase and water inside the part are analyzed. An appropriate analytical method for predicting the local flow and separation behavior of the phase has not been proposed yet.
あるパーツの内部空間を要素分割して水相および油相の混相流の流動解析をする代表的な方法には、オイラー法（Ｅｕｌｅｒ法）がある。このオイラー法では、パーツ内部を分割した各要素における水相と油相の体積分率、および相間の相互相関力を考慮して、それぞれの相の質量と運動量の保存方程式を解く。ただし、そのオイラー法では、相間の相互相関力として、粒径一定のときの値が用いられるので、油水分離装置で観察されるような粒径が成長しながら分離していく現象では、局所的な相間に作用する相互力に差異が生じ、実際の分離現象とは異なる予測結果となってしまう。
したがって、発明の課題は、上記状況に鑑み、油水分離設備のセトラ部において、上記のオイラー法に、油水中の水相の体積分率に比例して水滴の粒径を変化させ、その粒径に対する油水相間の相関力を考慮して、油相と水相の各々の局所の流動や体積分率といった分離挙動を予測する数値解析方法を提供することである。 Therefore, in view of the above situation, an object of the invention is to change the particle size of water droplets in the settling part of an oil-water separation facility to the Euler method described above in proportion to the volume fraction of the water phase in oil water. It is to provide a numerical analysis method for predicting separation behavior such as local flow and volume fraction of each of the oil phase and the water phase in consideration of the correlation force between the oil phase and the water phase.
上記課題の達成のために、本発明は、油水分離装置のセトラ部において、油水が入口から出口へ向かうにしたがい、比重分離が促進され、局所的に水相の体積分率が上昇すると、水滴どうしの衝突と合体とが起こるとして、水滴の粒径を大きくし、その粒径に対する油相と水相との間の相関力を考慮し、油相と水相との分離挙動、すなわち局所の空間の体積分率を予測する事を特徴とする。 In order to achieve the above object, according to the present invention, in the setra portion of the oil / water separator, when the oil / water is separated from the inlet to the outlet, the specific gravity separation is promoted and the water volume fraction increases locally. As the collision and coalescence occur, the particle size of the water droplet is increased, the correlation force between the oil phase and the water phase with respect to the particle size is considered, and the separation behavior of the oil phase and the aqueous phase, that is, the local It is characterized by predicting the volume fraction of space.
水滴の粒径は、実際の油水分離装置のセトラ部において、入口と出口とでそれぞれ実際に計測される。数値解析に際して、水滴の粒径は、入口と出口とでは計測した各々の値として設定され、その中間の分離過程では、水相の体積分率に比例して入口の粒径の値から出口の粒径の値になるまで、粒径の値を次第に大きくなるように設定している。上記のように体積分率にしたがい粒径を成長させる事によって、出口に向かって油水の分離が助長され、実際の分離挙動に近い予測が可能となる。 The particle size of the water droplet is actually measured at the inlet and the outlet in the actual settling portion of the oil / water separator. In the numerical analysis, the particle size of the water droplet is set as each measured value at the inlet and the outlet.In the intermediate separation process, the particle size of the inlet is proportional to the volume fraction of the water phase. The particle size value is set to gradually increase until the particle size value is reached. By growing the particle size according to the volume fraction as described above, oil / water separation is promoted toward the outlet, and prediction close to the actual separation behavior becomes possible.
本発明は、油水分離設備のセトラ部において、油相を連続相とし、水相を分散相とした混相流の数値解析に際して利用できる他、水相を連続相とし、油相を分散相とした混相流の数値解析に際しても同様に利用できる。 The present invention can be used in the numerical analysis of a mixed phase flow in which the oil phase is a continuous phase and the water phase is a dispersed phase in the setra portion of the oil / water separation facility, and the water phase is a continuous phase and the oil phase is a dispersed phase. It can be used in the same way for numerical analysis of multiphase flow.
具体的に記載すると、請求項１に係る発明は、油水分離設備のセトラ部において、油相を連続相とし、水相を分散相とした混相流の数値解析に際して、水相の水滴の粒径を油水中の水相の体積分率に比例して変化させ、その粒径に対する油相と水相と間の相互相関力を考慮して、油水の分離現象を予測する、ことを特徴とする。 Specifically, the invention according to claim 1 is directed to the particle size of water droplets in the water phase in the numerical analysis of the multiphase flow in which the oil phase is the continuous phase and the water phase is the dispersed phase in the setra portion of the oil / water separation facility. The oil-water separation phenomenon is predicted in consideration of the cross-correlation force between the oil phase and the water phase with respect to the particle size. .
請求項２に係る発明は、油水分離設備のセトラ部において、水相を連続相とし、油相を分散相とした混相流の数値解析に際して、油相の油滴の粒径を油水中の油相の体積分率に比例して変化させ、その粒径に対する油相と水相との間の相互相関力を考慮して、油水の分離現象を予測する、ことを特徴とする。 In the invention according to claim 2, in the setra portion of the oil / water separation facility, in the numerical analysis of the mixed phase flow in which the water phase is the continuous phase and the oil phase is the dispersed phase, the particle size of the oil droplets in the oil phase It is characterized in that the oil-water separation phenomenon is predicted in consideration of the cross-correlation force between the oil phase and the water phase with respect to the particle size, changing in proportion to the volume fraction of the phase.
本発明に係る請求項１の発明によると、油水分離設備のセトラ部において、油相を連続相とし、水相を分散相とした混相流の数値解析に際して、水相の水滴の粒径を油水中の水相の体積分率に比例して変化させ、その粒径に対する油相と水相と間の相互相関力を考慮して、油水の分離現象を予測することによって、セトラ部での入口から出口へ向かって徐々に油水分離していく挙動が実際の分離現象に近い安定な状態として再現できる。 According to the first aspect of the present invention, in the setra portion of the oil / water separation facility, in the numerical analysis of the mixed phase flow in which the oil phase is the continuous phase and the water phase is the dispersed phase, By changing the volume fraction of the water phase in proportion to the volume fraction of the water phase and taking into account the cross-correlation force between the oil phase and the water phase with respect to the particle size, the separation phenomenon of the oil and water is predicted. The behavior of oil-water separation gradually from the outlet to the outlet can be reproduced as a stable state close to the actual separation phenomenon.
本発明に係る請求項２の発明によると、油水分離設備のセトラ部において、水相を連続相とし、油相を分散相とした混相流の数値解析に際して、油相の油滴の粒径を油水中の油相の体積分率に比例して変化させ、その粒径に対する油相と水相との間の相互相関力を考慮して、油水の分離現象を予測することによって、セトラ部での入口から出口へ向かって徐々に油水分離していく挙動が実際の分離現象に近い安定な状態として再現できる。 According to the invention of claim 2 according to the present invention, in the setra portion of the oil / water separation facility, in the numerical analysis of the mixed phase flow in which the water phase is the continuous phase and the oil phase is the dispersed phase, the particle size of the oil droplets in the oil phase is By changing in proportion to the volume fraction of the oil phase in the oil water and taking into account the cross-correlation force between the oil phase and the water phase with respect to the particle size, The behavior of oil-water separation gradually from the inlet to the outlet can be reproduced as a stable state close to the actual separation phenomenon.
図１は、本発明に係る油水分離現象の数値解析方法を実施するために、油水分離設備としてミキサセトラのセトラ部１を対象とした解析モデルを示す。油水７は、図示しないミキサ部で撹拌され、完全混合された状態として、セトラ部１の一端のセトラ入口２からセトラ部１の内部に流入させる。 FIG. 1 shows an analysis model for the setra section 1 of a mixer setra as an oil / water separation facility in order to carry out the numerical analysis method of the oil / water separation phenomenon according to the present invention. The oil water 7 is agitated in a mixer unit (not shown) and flows into the interior of the setra unit 1 from the setra inlet 2 at one end of the setra unit 1 as a state of being completely mixed.
セトラ部１の内部で、油水７は、セトラ部１の水相出口３、油相出口４の方向に向かって移動するが、その過程で、水相８と油相９とに徐々に分離して行く。分離後に、水相８はセトラ部１の底部の連通路５を経て、水相出口３から流出し、また、油相９は、上部の油相出口４からオーバーフローして流出する。 Inside the setra section 1, the oil water 7 moves toward the water phase outlet 3 and the oil phase outlet 4 of the setra section 1, but in the process, it is gradually separated into the water phase 8 and the oil phase 9. Go. After the separation, the aqueous phase 8 flows out from the aqueous phase outlet 3 through the communication passage 5 at the bottom of the setra portion 1, and the oil phase 9 overflows from the upper oil phase outlet 4 and flows out.
液物性は、水相８の密度を１．０９〔ｇ／ｃｍ３〕、粘度１．９〔ｍＰａ・ｓ〕とし、油相９の密度を０．９９〔ｇ／ｃｍ３〕、粘度１１〔ｍＰａ・ｓ〕とし、セトラ入口２から水：油比＝１：２の割合とした油水７の流量１５０（Ｌ／ｍｉｎ〕を流入した際の混相流の解析を実施した。なお、上記の大かっこ中の「ｃｍ３」は、「立方センチメートル」を表す。 The liquid properties are as follows: the density of the aqueous phase 8 is 1.09 [g / cm3] and the viscosity is 1.9 [mPa · s], the density of the oil phase 9 is 0.99 [g / cm3], and the viscosity is 11 [mPa · s]. s], and the analysis of the multiphase flow when the flow rate 150 (L / min) of the oil / water 7 at a ratio of water: oil ratio = 1: 2 was flowed from the setra inlet 2 was carried out. “Cm3” of “Cubic centimeter”.
図２は、図１の解析モデルを利用して、上記の液物性のもとで、油相９を連続相とし、水相８を分散相とした油水７の完全混合状態の混相流について、水滴の粒径１．０〔ｍｍ〕を一定として、混相流の油水分離を解析したときの水相８の体積分率を示す。ここで用いた水相８の水滴の粒径１．０〔ｍｍ〕は、セトラ入口２で計測された値である。セトラ部１の水相８の体積分率は、鉛直方向では底部ほど大きい分布となっているが、セトラ入口２から水相出口３、油相出口４の方向では水相８の体積分率の変化が見られない。また、絶対値としても水相出口３、油相出口４では、油水７が完全に分離されておらず、実際の分離現象を予測できていない。 FIG. 2 shows a mixed phase flow of a completely mixed state of oil water 7 in which the oil phase 9 is a continuous phase and the water phase 8 is a dispersed phase using the analysis model of FIG. The volume fraction of the aqueous phase 8 when analyzing the oil-water separation of the multiphase flow with the water droplet diameter 1.0 [mm] being constant is shown. The particle diameter 1.0 [mm] of the water droplet of the water phase 8 used here is a value measured at the setra inlet 2. The volume fraction of the water phase 8 in the setra portion 1 has a distribution that increases toward the bottom in the vertical direction, but the volume fraction of the water phase 8 in the direction from the setra inlet 2 to the water phase outlet 3 and the oil phase outlet 4 There is no change. Further, even as absolute values, the oil water 7 is not completely separated at the water phase outlet 3 and the oil phase outlet 4, and the actual separation phenomenon cannot be predicted.
図３は、図１の解析モデルを利用して、上記の液物性のもとで、油相９を連続相とし、水相８を分散相とした油水７の完全混合状態の混相流について、水滴の粒径２．５〔ｍｍ〕を一定として、混相流の油水分離を解析したときの水相８の体積分率を示す。ここで用いた水相８の水滴の粒径２．５〔ｍｍ〕は、セトラ入口２で計測された値である。 FIG. 3 shows a mixed phase flow of the oil-water 7 in which the oil phase 9 is a continuous phase and the water phase 8 is a dispersed phase using the analytical model of FIG. The volume fraction of the water phase 8 when analyzing the oil-water separation of the multiphase flow with the water droplet diameter of 2.5 [mm] being constant is shown. The particle diameter 2.5 [mm] of the water droplet of the aqueous phase 8 used here is a value measured at the setra inlet 2.
図２に示した油水分離の状況と、図３に示した油水分離の状況とを比較すると、水相８の水滴の粒径を大きくすることによって、鉛直方向の体積分率の差が大きくなり、油水７の分離が促進されるというセトラ部１に必要な本質的な機能に矛盾しない結果となった。 Comparing the situation of oil / water separation shown in FIG. 2 with the situation of oil / water separation shown in FIG. 3, the difference in the volume fraction in the vertical direction increases by increasing the particle size of the water droplets in the aqueous phase 8. As a result, the separation of the oily water 7 was promoted, and the results were consistent with the essential function required for the setra section 1.
また、図３に示した油水分離によると、水相８の水滴の粒径２．５〔ｍｍ〕で一定の場合に、水相８と油相９とがクリアーに分離され、セトラ部１の上部では体積分率０．０の水相８が見られ、一方、その底部では体積分率１．０の水相８が見られる。ただし、この場合も、セトラ入口２から水相出口３、油相出口４の方向において、水相８の体積分率の鉛直方向の分布の変化がほとんど見られず、実現象の予測再現はされていない。 Further, according to the oil-water separation shown in FIG. 3, the water phase 8 and the oil phase 9 are clearly separated when the particle size of the water droplets of the water phase 8 is constant at 2.5 [mm]. An aqueous phase 8 with a volume fraction of 0.0 is seen at the top, while an aqueous phase 8 with a volume fraction of 1.0 is seen at the bottom. However, in this case as well, there is almost no change in the vertical distribution of the volume fraction of the water phase 8 in the direction from the setra inlet 2 to the water phase outlet 3 and the oil phase outlet 4, and the actual phenomenon is predicted and reproduced. Not.
次に、図４は、本発明に係る油水分離現象の数値解析方法にもとづいて、図１の解析モデルを利用し、上記の液物性のもとで、油相９を連続相とし、水相８を分散相とするとともに、水相８の水滴の粒径を水相８の体積分率に比例して変化させ、油水７の完全混合状態の混相流について、油水分離を解析したときの水相８の体積分率の分布を示す。 Next, FIG. 4 is based on the numerical analysis method of the oil-water separation phenomenon according to the present invention, and uses the analysis model of FIG. 8 is a dispersed phase, and the water droplet size of the water phase 8 is changed in proportion to the volume fraction of the water phase 8, and the water when the oil-water separation is analyzed for the mixed-phase flow of the oil-water 7 in a completely mixed state. The volume fraction distribution of phase 8 is shown.
この場合、水相８の水滴の粒径は、初期条件としてセトラ入口２で計測された１．０〔ｍｍ〕とし、水相８の体積分率が１．０のときに、水相出口３で計測された２．５〔ｍｍ〕となるように、下記の関係式（１）を用いて設定する。この関係式（１）は、セトラ入口２での初期の水相８の水滴の粒径を１．０〔ｍｍ〕とし、油水７の油水分離の進行にともなって、水相８の体積分率に比例して水滴の粒径を次第に大きくし、水相出口３で最終的に粒径を２．５〔ｍｍ〕として設定する。 In this case, the water droplet diameter of the water phase 8 is 1.0 [mm] measured at the setra inlet 2 as an initial condition, and when the volume fraction of the water phase 8 is 1.0, the water phase outlet 3 Is set using the following relational expression (1) so as to be 2.5 [mm] measured in (1). This relational expression (1) indicates that the initial water phase 8 water droplet diameter at the setra inlet 2 is 1.0 [mm], and the volume fraction of the water phase 8 is increased as the oil water 7 is separated. The particle diameter of the water droplets is gradually increased in proportion to the water droplet diameter, and finally the particle diameter is set to 2.5 [mm] at the water phase outlet 3.
上記関係式（１）は、水相８の水滴の粒径をｄ〔ｍｍ〕、水相８の体積分率をＶｆを用いて下記のように表される。
ｄ＝２．１４×Ｖｆ＋０．３６
The relational expression (1) is expressed as follows by using d [mm] as the particle diameter of water droplets in the water phase 8 and Vf as the volume fraction of the water phase 8.
d = 2.14 × Vf + 0.36
上記関係式（１）で計算すると、下記のように、セトラ入口２での水相８の水滴の粒径は１．０〔ｍｍ〕となり、水相出口３での水相８の水滴の粒径は２．５〔ｍｍ〕となる。
セトラ入口２での水相８の水滴の粒径：１．０＝２．１４×０．３＋０．３６
水相出口３での水相８の水滴の粒径 ：２．５＝２．１４×１．０＋０．３６
When calculated by the above relational expression (1), the water droplet size of the water phase 8 at the setra inlet 2 is 1.0 [mm] as shown below, and the water droplet particles of the water phase 8 at the water phase outlet 3 are as follows. The diameter is 2.5 [mm].
Particle size of water droplets of aqueous phase 8 at Setra inlet 2: 1.0 = 2.14 × 0.3 + 0.36
Particle size of water droplets in water phase 8 at water phase outlet 3: 2.5 = 2.14 × 1.0 + 0.36
図４の水相８の体積分率の分布によると、油水７は、セトラ入口２から出口方向にも徐々に分離していき、水相出口３ででは完全に分離する。このようにして、実現象に類似の予測結果が得られた。 According to the volume fraction distribution of the water phase 8 in FIG. 4, the oil water 7 gradually separates from the setra inlet 2 toward the outlet, and is completely separated at the water phase outlet 3. In this way, a prediction result similar to the actual phenomenon was obtained.
本発明は、以上の説明のように、油水分離設備のセトラ部１において、油水７中の油相９を連続相とし、水相８を分散相とした混相流の数値解析に際して利用できる他、油水中の連続相、分散相の対象を逆として、油水７中の水相８を連続相とし、油相９を分散相とした混相流について油水分離の数値解析に際しても同様に利用できる。 As described above, the present invention can be used in the numerical analysis of a multiphase flow in which the oil phase 9 in the oil water 7 is a continuous phase and the water phase 8 is a dispersed phase in the setra portion 1 of the oil / water separation facility. The same applies to the numerical analysis of the oil / water separation for the mixed phase flow in which the water phase 8 in the oil water 7 is the continuous phase and the oil phase 9 is the dispersed phase, with the targets of the continuous phase and the dispersed phase in the oil water reversed.
１：セトラ部
２：セトラ入口
３：水相出口
４：油相出口
５：連通路
７：油水
８：水相
９：油相
1: Setra part 2: Setra inlet 3: Water phase outlet 4: Oil phase outlet 5: Communication path 7: Oil water 8: Water phase 9: Oil phase
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| JP2007202015A JP2009034618A (en) | 2007-08-02 | 2007-08-02 | Numerical analysis method of oil-water separation phenomenon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593190A (en) * | 2018-06-25 | 2018-09-28 | 青岛科技大学 | A kind of new method determining CO2/ oil-based system minimum miscibility pressures using oil phase hanging drop volume change |
| JP2019520188A (en) * | 2016-05-03 | 2019-07-18 | サウジ アラビアン オイル カンパニー | Process for analysis and optimization of multiphase separators, with particular emphasis on simulated gravity separation of the dispersion of immiscible liquids |
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2007
- 2007-08-02 JP JP2007202015A patent/JP2009034618A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019520188A (en) * | 2016-05-03 | 2019-07-18 | サウジ アラビアン オイル カンパニー | Process for analysis and optimization of multiphase separators, with particular emphasis on simulated gravity separation of the dispersion of immiscible liquids |
| CN108593190A (en) * | 2018-06-25 | 2018-09-28 | 青岛科技大学 | A kind of new method determining CO2/ oil-based system minimum miscibility pressures using oil phase hanging drop volume change |
| CN108593190B (en) * | 2018-06-25 | 2023-12-19 | 青岛科技大学 | Novel method for determining minimum miscible pressure of CO 2/oil phase system by utilizing oil phase hanging drop volume change |
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