JP4631019B2 - Gas supply device - Google Patents

Description

Ｄ：ガス器具のノズルの口径、Ｋ：流量係数、ｐ：供給ガス圧、ｄ：ガスの比重であるから、
【数２】

となる。尚、Ｈ／√ｄがウォッベ指数である。
ここで、ＬＰＧとＤＭＥとでＤとＫは等しいので、
ＬＰＧ 比重：ｄ１、発熱量：Ｈ１
ＤＭＥ 比重：ｄ２、発熱量：Ｈ２
とすると、供給ガス圧がｐ１の時のＬＰＧのインプットと等しくなるＤＭＥの供給ガス圧ｐ２は、式（１）より、
【数３】

で求まる。
また、本実施形態では、ＬＰＧとして、計算上、純プロパンを用いており、第一ガスガバナ５で設定される供給ガス圧は２８０ｍｍＨ_２Ｏであるから、Ｈ１、Ｈ２、ｄ１、ｄ２は、それぞれ、Ｈ１＝９１．０（ＭＪ／Ｎｍ^３）、Ｈ２＝５９．３（ＭＪ／Ｎｍ^３）、ｄ１＝１．５２、ｄ２＝１．５９であり、ｐ１＝２８０ｍｍＨ_２Ｏであるから、これらの値を式（２）に代入すると、ｐ２＝６９０ｍｍＨ_２Ｏが求まる。
従って、本実施形態では、ＬＰＧの供給ガス圧は２８０ｍｍＨ_２Ｏに設定され、ＤＭＥの供給ガス圧は６９０ｍｍＨ_２Ｏに設定される。尚、ＬＰＧの供給ガス圧２８０ｍｍＨ_２Ｏというのは、従来からのＬＰＧの供給ガス圧である。
【００１４】
この様に構成されたガス供給装置１では、三方コック１１を切替えることによりガス器具に供給するガス種をＬＰＧとＤＭＥのどちらかに切替える。三方コック１１を、第一ガス配管３と主ガス配管１０とが連通状態となるように切替えてＬＰＧを供給し、第二ガス配管７と主ガス配管１０とが連通状態となるように切替えてＤＭＥを供給する。
この際、ＬＰＧを供給してもＤＭＥを供給してもガス器具へのインプットが等しく、その値は従来のＬＰＧのインプットに等しいので、従来のＬＰＧ用のガス器具をそのまま使用できるため、新たにＤＭＥ用のガス器具を導入する必要がなく経済的である。尚、必要に応じてガス器具の空気供給量を調整するようにしてもよい。
【００１５】
また、三方コック１１を切替えるといった簡単な操作で、ガス器具へのＬＰＧとＤＭＥとの供給を切替えることができるので、通常は値段の安いＤＭＥを使用し、ＤＭＥの供給が滞った際にはＬＰＧを使用するといった、ＤＭＥとＬＰＧとの並行使用を使い勝手良く行うことができる。しかも、ＤＭＥとＬＰＧを供給した場合のインプットが等しいので、ガス器具の燃焼や出力等の性能を良好に維持して、安全に使用することができる。
【００１６】
また、間違ってＬＰＧボンベ２を第二接続口８に、ＤＭＥボンベ６を第一接続口４に接続してしまうと、せっかくガス器具の燃焼や出力等の性能が良好になるように設定している供給ガス圧が変化してしまう。特に、ウォッベ指数の高いＬＰＧを第二接続口８から供給してしまうとインプットが大きくなりすぎて危険である。そこで、このようなボンベのつなぎ間違いを防止するために、本実施形態のガス供給装置１では、第一接続口４と第二接続口８とが径の大きさを変えて形成されており、第一接続口４にはＬＰＧボンベ２のみが接続でき、第二接続口８にはＤＭＥボンベ６のみが接続できるようにしてあるので安全である。
【００１７】
以上本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。
例えば、本実施形態では、ウォッベ指数の異なるガス種としてＬＰＧ（純プロパン）とＤＭＥとが用いられているが、これに限られるものではない。
また、ＬＰＧの供給ガス圧は２８０ｍｍＨ_２Ｏに設定され、ＤＭＥの供給ガス圧は６９０ｍｍＨ_２Ｏに設定されているが、この値に限ったものではなく、異なる２種のガスのインプットが等しくなるような供給ガス圧に設定すればよい。
【００１８】
【発明の効果】
以上詳述したように、本発明の請求項１記載のガス供給装置によれば、簡単な操作で異なるウォッベ指数のガスをガス器具へのインプットを適切に維持したまま並行使用することができる。このため、ガスの価格や市場への供給状態に応じて、使用するガス種を選択することができ経済的である。
【００１９】
更に、本発明の請求項２記載のガス供給装置によれば、第一ガスボンベと第二ガスボンベとの誤接続を防止でき安全である。
【００２０】
更に、本発明の請求項３記載のガス供給装置によれば、ＬＰＧとＤＭＥの並行使用が可能となるので、安いＤＭＥの市場への供給が充分な場合はＤＭＥを使用し、ＤＭＥの供給が滞った際にはＬＰＧを使用することができるので、ＬＰＧからＤＭＥの移行期において非常に有用である。
【図面の簡単な説明】
【図１】本実施形態としてのガス供給装置の概略構成図である。
【符号の説明】
１…ガス供給装置、２…ＬＰＧボンベ、３…第一ガス配管、４…第一接続口、５…第一ガスガバナ、６…ＤＭＥボンベ、７…第二ガス配管、８…第二接続口、９…第二ガスガバナ、１０…主ガス配管、１１…三方コック。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas supply apparatus that switches and supplies a first gas and a second gas having different Wobbe indices.
[0002]
[Prior art]
Currently, city gas and LPG (liquefied petroleum gas) are mainly used as household gas species, but LPG is somewhat expensive. Therefore, recently, the use of DME (dimethyl ether), which is an inexpensive gas, as an alternative fuel for LPG has been studied.
In this case, since the Wobbe index is significantly different between DME and LPG, if DME is supplied to the LPG gas appliance as it is, the calorific value (input) per unit time will change significantly, and the combustion and output of the gas appliance will change. Therefore, it is necessary to develop a new gas appliance for DME.
[0003]
[Problems to be solved by the invention]
However, since the supply of DME is not sufficient at present, there is no guarantee that DME can always be used, and even if LPG is used when DME supply is stagnant, LPG may be replaced with DME. For the time being, we must consider the parallel use of DME and LPG.
For this reason, even if it replaces with the gas appliance for DME, performance, such as combustion of a gas appliance and an output, will deteriorate this time at the time of use of LPG.
The gas supply device of the present invention has an object to solve the above problems and maintain good performances such as combustion and output of gas appliances even when LPG and DME are used in parallel.
[0004]
[Means for Solving the Problems]
The gas supply apparatus according to claim 1 of the present invention for solving the above-described problems is
A gas supply device that switches between a first gas and a second gas having different Wobbe indices and supplies them to a household gas appliance,
A first gas flow path connecting a first gas cylinder filled with liquefied first gas;
A second gas flow path connecting a second gas cylinder in which the second gas is liquefied and sealed;
A gas channel switching means for selectively switching the first gas channel and the second gas channel to communicate with the main gas channel leading to the gas appliance;
A first governor for setting a supply gas pressure of the first gas supplied from the first gas flow path;
A second governor for setting a supply gas pressure of the second gas supplied from the second gas flow path,
The gist is that the supply gas pressure of the first gas and the supply gas pressure of the second gas are set so that the calorific values per unit time of the supplied first gas and the second gas are equal.
[0005]
A gas supply device according to claim 2 of the present invention is the gas supply device according to claim 1,
The gist is that the first connection port of the first gas passage connected to the first gas cylinder and the second connection port of the second gas passage connected to the second gas cylinder are provided with different diameters.
[0006]
A gas supply device according to claim 3 of the present invention is the gas supply device according to claim 1 or 2,
The gist is that the first gas is LPG and the second gas is DME.
[0007]
The gas supply apparatus according to claim 1 of the present invention having the above-described configuration switches the gas flow path by the gas flow path switching means, selects the first gas and the second gas, and supplies them to the main gas flow path. In this case, since the supply gas pressure is set so that the calorific value per unit time is the same for both types of gas, gases with different Wobbe indices can be used without adjusting the input on the gas appliance side. Even when used in parallel, the gas appliance can be used well.
[0008]
Moreover, since the 1st connection port and the 2nd connection port have a different diameter, the gas supply apparatus of Claim 2 of this invention can prevent connecting a 1st gas cylinder and a 2nd gas cylinder and making a mistake.
[0009]
Moreover, the gas supply apparatus according to claim 3 of the present invention can use LPG and DME in parallel.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the gas supply apparatus of the present invention will be described below.
[0011]
FIG. 1 is a schematic configuration diagram of a gas supply apparatus 1 as an embodiment of the present invention.
The gas supply device 1 includes a first gas pipe 3 connected to the LPG cylinder 2 and a second gas pipe 7 connected to the DME cylinder 6. In the present embodiment, pure propane, which is 100% propane, is used as the LPG for calculation. In the first gas pipe 3, the first connection port 4 connected to the connection port of the LPG cylinder 2 and the supply gas pressure of the LPG flowing through the first gas pipe 3 are set to a constant magnitude in order from the upstream side. The gas governor 5 is provided, and the second gas pipe 7 has, in order from the upstream side, a second connection port 8 connected to the connection port of the DME cylinder 6 and a supply gas pressure of DME flowing through the second gas pipe 7 is constant. A second gas governor 9 set to a size is provided.
The first connection port 4 and the second connection port 8 are formed to have different diameters. That is, each connection port is formed in the connection diameter with the corresponding cylinder, and cannot be connected in reverse.
[0012]
The home gas inlet 12 is provided with a three-way cock 11 as a gas flow path switching means. The first gas pipe 3 and the second gas pipe 7 are provided at the first and second inlets of the three-way cock 11. Are connected to each other. Therefore, the gas from one gas pipe selected by the switching operation of the three-way cock 11 is supplied from the gas inlet 12 to the main gas pipe 10 in the home. The main gas pipe 10 is branched into a plurality of gas pipes on the downstream side thereof and connected to gas appliances.
[0013]
Further, the supply gas pressures of LPG and DME are respectively set in the first gas governor 5 and the second gas governor 9 so that the input to the gas appliance is equal between when LPG is supplied and when DME is supplied. The
Here, a method of calculating the supply gas pressure in this case will be described.
I = Q × H
I: input, Q: gas flow rate, H: calorific value of gas,
[Expression 1]

D: the diameter of the nozzle of the gas appliance, K: the flow coefficient, p: the supply gas pressure, d: the specific gravity of the gas,
[Expression 2]

It becomes. H / √d is the Wobbe index.
Here, since D and K are equal in LPG and DME,
LPG Specific gravity: d1, calorific value: H1
DME Specific gravity: d2, calorific value: H2
Then, the supply gas pressure p2 of DME, which is equal to the input of LPG when the supply gas pressure is p1, is given by
[Equation 3]

It is obtained by
In the present embodiment, pure propane is used as the LPG in calculation, and the supply gas pressure set in the first gas governor 5 is 280 mmH ₂ O. Therefore, H1, H2, d1, and d2 are respectively Since H1 = 91.0 (MJ / Nm ³ ), H2 = 59.3 (MJ / Nm ³ ), d1 = 1.52, d2 = 1.59, and p1 = 280 mmH ₂ O, these values Is substituted into equation (2), p2 = 690 mmH ₂ O is obtained.
Therefore, in this embodiment, the supply gas pressure of LPG is set to 280 mmH ₂ O, and the supply gas pressure of DME is set to 690 mmH ₂ O. The LPG supply gas pressure of 280 mmH ₂ O is a conventional LPG supply gas pressure.
[0014]
In the gas supply device 1 configured in this way, the gas type supplied to the gas appliance is switched to either LPG or DME by switching the three-way cock 11. Switch the three-way cock 11 so that the first gas pipe 3 and the main gas pipe 10 are in communication with each other, supply LPG, and switch the second gas pipe 7 and the main gas pipe 10 in communication with each other. Supply DME.
At this time, the input to the gas appliance is the same regardless of whether the LPG is supplied or the DME is supplied, and the value is equal to the input of the conventional LPG. Therefore, the conventional gas appliance for LPG can be used as it is. It is economical because it is not necessary to introduce gas equipment for DME. In addition, you may make it adjust the air supply amount of a gas appliance as needed.
[0015]
In addition, since the supply of LPG and DME to the gas appliance can be switched by a simple operation such as switching the three-way cock 11, normally, a low-priced DME is used, and when the supply of DME is delayed, the LPG The parallel use of DME and LPG, such as using, can be performed conveniently. Moreover, since the inputs when DME and LPG are supplied are equal, the performance of the gas appliance such as combustion and output can be maintained well and used safely.
[0016]
Also, if the LPG cylinder 2 is mistakenly connected to the second connection port 8 and the DME cylinder 6 is connected to the first connection port 4, it is set so that the performance of the gas appliance such as combustion and output is improved. The supply gas pressure is changed. In particular, if LPG having a high Wobbe index is supplied from the second connection port 8, the input becomes too large, which is dangerous. Therefore, in order to prevent such a cylinder connection error, in the gas supply device 1 of the present embodiment, the first connection port 4 and the second connection port 8 are formed with different diameters, Since only the LPG cylinder 2 can be connected to the first connection port 4 and only the DME cylinder 6 can be connected to the second connection port 8, it is safe.
[0017]
Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
For example, in the present embodiment, LPG (pure propane) and DME are used as gas types having different Wobbe indices, but the present invention is not limited to this.
Further, the supply gas pressure of LPG is set to 280 mmH ₂ O and the supply gas pressure of DME is set to 690 mmH ₂ O. However, the present invention is not limited to this value, and the inputs of two different types of gases are equal. What is necessary is just to set to such supply gas pressure.
[0018]
【The invention's effect】
As described above in detail, according to the gas supply device of the first aspect of the present invention, gases having different Wobbe indices can be used in parallel with a simple operation while appropriately maintaining the input to the gas appliance. For this reason, the gas type to be used can be selected according to the price of the gas and the supply state to the market, which is economical.
[0019]
Furthermore, according to the gas supply apparatus of the second aspect of the present invention, it is possible to prevent erroneous connection between the first gas cylinder and the second gas cylinder, which is safe.
[0020]
Furthermore, according to the gas supply device of the third aspect of the present invention, since LPG and DME can be used in parallel, DME is used when supply of cheap DME to the market is sufficient. Since LPG can be used when stagnated, it is very useful in the transition phase from LPG to DME.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas supply apparatus according to an embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas supply apparatus, 2 ... LPG cylinder, 3 ... 1st gas piping, 4 ... 1st connection port, 5 ... 1st gas governor, 6 ... DME cylinder, 7 ... 2nd gas piping, 8 ... 2nd connection port, 9 ... Second gas governor, 10 ... Main gas piping, 11 ... Three-way cock.

Claims (3)

A gas supply device that switches between a first gas and a second gas having different Wobbe indices and supplies them to a household gas appliance,
A first gas flow path connecting a first gas cylinder filled with liquefied first gas;
A second gas flow path connecting a second gas cylinder in which the second gas is liquefied and sealed;
A gas channel switching means for selectively switching the first gas channel and the second gas channel to communicate with the main gas channel leading to the gas appliance;
A first governor for setting a supply gas pressure of the first gas supplied from the first gas flow path;
A second governor for setting a supply gas pressure of the second gas supplied from the second gas flow path,
A gas characterized in that the supply gas pressure of the first gas and the supply gas pressure of the second gas are set so that the calorific values per unit time of the supplied first gas and the second gas are equal. Feeding device.   The first connection port of the first gas channel connected to the first gas cylinder and the second connection port of the second gas channel connected to the second gas cylinder are provided with different diameters. Item 2. A gas supply device according to Item 1.   The gas supply apparatus according to claim 1 or 2, wherein the first gas is LPG, and the second gas is DME.

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