JP4823861B2 - Gas storage and delivery method and apparatus - Google Patents

Description

The present invention relates to a gas storage and delivery method and apparatus, and more particularly to a gas storage and delivery method and apparatus suitable for high-density storage of digestion gas.

  In recent years, due to social demands for effective use of resources and environmental conservation, effective use of digestion gas (biogas) generated with sewage treatment, livestock waste treatment, and the like has been demanded. Regarding this type of technology, a technology for storing digestion gas using an adsorbent after desulfurization, dehumidification, and pressurization is disclosed (for example, Patent Document 1).

  However, in methane (CH4) and carbon dioxide (CO2), which are the main components of digestion gas, CO2 is more easily adsorbed and is less likely to be desorbed, so that there is a problem that the composition of the delivery gas varies according to the pressure in the container. is there. For this reason, Patent Document 1 employs a method of reducing the composition of the desorption gas and the variation in heat quantity by limiting the storage pressure to a certain range, but there is a problem that high-density storage is difficult.

As a technique for eliminating composition fluctuations and achieving both high-density storage, a technique for adjusting the amount of heat by a cascade method when desorbing the digested and stored digestion gas and driving it out of the storage container is disclosed (for example, Patent Documents). 2). FIG. 21 shows a gas storage and delivery device 100 according to this method. That is, the desorption gas from the storage holder 101 filled with the adsorbent and the high calorific gas such as natural gas are mixed and supplied by the mixer 105. In this case, the calorific value is adjusted by adjusting the opening ratio of the orifices 103 and 104 by the flow rate controller 102 based on the output signal from the calorie recording controller 106 and adjusting the mixing ratio of the desorption gas and the high calorific gas. Yes.
JP 2003-240195 A JP 2001-214175 A

    However, according to the method of Patent Document 2, there is a problem that a high calorific gas such as natural gas is essential in addition to digestion gas, and a high calorie adjusting means is necessary, so that an increase in cost cannot be avoided.

The present invention is for solving such problems, and can store digestion gas and the like at a high density without requiring a high calorific gas or a high calorie adjusting means, and can send out the composition with less fluctuation. A gas storage and delivery method and apparatus are provided. The gist of the present invention is as follows. That is,
In the first aspect of the invention, the target gas containing a plurality of components having different amounts of adsorption and desorption with respect to the adsorbent at the same pressure is distributed and stored in a plurality of storage holders filled with the adsorbent, and mixed downstream of the storage holder. The gas storage and delivery method is to control the amount of inflow and delivery to each storage holder, and adjust the storage pressure appropriately to make the gas composition of the delivery gas different for each storage holder. The gas storage and delivery method is characterized in that the physical quantity to be managed of the delivery gas is controlled within a desired range.

In this case, the target gas can be a digestion gas containing CH4 and CO2 as main components (claim 2).
CH4 is hardly adsorbed and is easily desorbed. On the other hand, CO2 is easily adsorbed and difficult to desorb. Accordingly, when the internal pressure of the storage holder decreases, a large amount of CH4 that is easy to desorb is sent out, and then CO2 that is difficult to desorb is sent out, so that the CH4 composition ratio decreases as the pressure decreases. Further, when the internal pressure of the storage holder rises, CO2 that is easily adsorbed is adsorbed more as the pressure rises, so that the CH4 composition ratio of the delivery gas rises.
The present invention utilizes this principle to change the CH4 and CO2 composition ratio of the delivery gas for each storage holder, and to control the management target physical quantity of the delivery gas after mixing to a desired range.

City gas can be used as the target gas (claim 3).
In conventional gas storage and supply systems that adjust the amount of heat with LPG when adsorbing and storing city gas (natural gas, etc.), the amount of heat fluctuates according to the pressure in the gas holder when it is sent. It was necessary to adjust the amount of heat, and there was a problem that ancillary facilities increased.
According to the present invention, it is possible to control the amount of heat within a certain range by sending and mixing gases having different amounts of heat from a plurality of gas tanks, so that the LPG tank and the heat amount regulator are not required. Is possible.

Further, the physical quantity to be managed is the quantity of heat of the delivery gas (claim 4).
Furthermore, the physical quantity to be managed is a variation range of the delivery gas composition (claim 5).
Furthermore, the physical quantity to be managed is one or both of a Wobbbe index and a gas combustion rate index (Claim 6).
Currently, city gas nationwide is classified into 14 types of gas groups based on the Wobbe index and burning rate index, and city gas companies can supply city gas of the specified gas type to consumers in the supply area. As required by the Gas Business Law. Here, the Wobbbe index (WI) is a numerical value obtained by dividing the calorific value H (MJ / m3) of the gas by the square root of the specific gravity s of the gas with respect to air.
WI = H / √s
This is an index of complete combustibility of gas equipment.
The combustion rate index (MCP) is expressed by the following equation.

ここに、Ｓ１、ｆ１はそれぞれ都市ガス中の各可燃性ガスの燃焼速度及び係数、Ａ１は都市ガス中の各可燃性ガスの含有率（体積百分率）、Ｋは減衰係数であって、次式により算出した値である。

Here, S1 and f1 are the burning rate and coefficient of each combustible gas in the city gas, A1 is the content (volume percentage) of each combustible gas in the city gas, and K is the attenuation coefficient. The value calculated by

式中、α１は、各可燃性ガスの補正係数、ＣＯ２、Ｎ２、Ｏ２は、それぞれガス中の二酸化炭素、窒素、酸素の含有量（体積百分率）である。なお、Ｓ１、ｆ１、α１の具体的数値についてはガス事業法に示されているため、ここでは省略する。
例えば、ＣＨ４を主成分とする１３Ａ都市ガスについては、５２．７≦ＷＩ≦５７．８、３５≦ＭＣＰ≦４７と定められている。従って、本発明により混合後ガスのＷＩ及びＭＣＰをこの範囲に制御することにより、供給域内で機器を良好に燃焼させることができる。

In the formula, α1 is a correction coefficient of each combustible gas, and CO2, N2, and O2 are the contents (volume percentage) of carbon dioxide, nitrogen, and oxygen in the gas, respectively. Since specific values of S1, f1, and α1 are shown in the Gas Business Law, they are omitted here.
For example, for 13A city gas mainly composed of CH4, it is determined that 52.7 ≦ WI ≦ 57.8 and 35 ≦ MCP ≦ 47. Therefore, by controlling the WI and MCP of the mixed gas within this range according to the present invention, the equipment can be burned well in the supply area.

  Further, a high calorific gas is added to the mixed delivery gas (Claim 7).

  The invention of claim 8 includes a plurality of storage holders filled with an adsorbent, and means for dispersing and storing target gases containing a plurality of components having different amounts of adsorption and desorption with respect to the adsorbent at the same pressure in each storage holder; Means for mixing and sending downstream of the storage holders, and means for controlling the inflow and delivery amounts to each storage holder so that the physical quantity to be managed of the delivery gas after mixing is within a desired range. A gas storage and delivery device characterized by comprising:

  ADVANTAGE OF THE INVENTION According to this invention, it became possible to implement | achieve high density storage, suppressing a composition fluctuation | variation using the storage holder filled with the adsorbent.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to FIGS. For ease of understanding, the same components are denoted by the same reference numerals in the respective drawings. Needless to say, the scope of the present invention is described in the claims and is not limited to the following embodiments.

(First embodiment)
FIG. 1 is a diagram showing an overall configuration of a gas storage / delivery device 1A according to the present embodiment. FIG. 2 is a diagram showing a digestion gas storage and delivery control flow.
Referring to FIG. 1, gas storage and delivery apparatus 1A includes gas holders H1 and H2 filled with an adsorbent therein, piping groups L1 to L6 for storing and supplying digestion gas in each holder, and holders H1, H1. And a control unit 5 that performs gas inflow / outflow amount control with respect to H2. Activated carbon is used as the filling adsorbent. Mass flow controllers (MFC) 3a and 3b are interposed in the holder upstream pipes L2 and L4. Further, MFCs 4a and 4b are interposed in the holder downstream pipes L3 and L5. Each MFC and the control unit 5 are connected by a signal line, and the inflow / outflow amount can be controlled by a control signal from the control unit 5.
With the above configuration, the desulfurized / dehumidified digested gas (main components CO2, CH4) supplied via the pipe L1 is branched into the pipes L2, L4 and led to the holders H1, H2, and the pressure in the holder The gas amount corresponding to each equilibrium adsorption amount at the temperature is adsorbed. Further, the gas delivered from the holders H1 and H2 joins the pipe L6 via the pipes L3 and L5, and then is supplied to a consumption device (not shown) (for example, a gas engine / heat pump).

  Next, a digestion gas storage and delivery control flow according to this embodiment will be described with reference to FIG. In stage 1, the inflow amounts to the storage holders are set to V1i = Va and V2i = Vb, respectively. The sending amounts are set to V1o = Vb 'and V2o = Va', respectively (step S101). Here, Va> Vb, Va> Vb ', Va'> Vb '. In this way, continuous operation is performed for a fixed time (for example, 12 hours). During this time, in the holder H1, the inflow amount> the delivery amount, so the holder internal pressure P1 rises. Since CO2 is more easily adsorbed between CO2 and CH4, the CO2 concentration of the delivery gas decreases, and the composition ratio of CH4 increases accordingly. On the other hand, since the amount of inflow is smaller than the amount of delivery in the holder H2, the pressure P2 is reduced and more adsorbed CO2 is delivered, so that the concentration of CO2 in the delivery gas increases. Along with this, the CH4 composition ratio decreases. Since the composition of each holder fluctuates as described above, the composition of the mixed gas after merging cancels both holder gas composition changes, and the fluctuation range is small.

  In stage 2, the inflow amount and the outflow amount for both holders are reversed. That is, the inflow amounts are V1i = Vb and V2i = Va, respectively. Further, the transmission amounts are set to V1o = Va 'and V2o = Vb', respectively (step S102). In this state, the operation is continued for the same time as stage 1. In the meantime, in the holder H2, the inflow amount> the delivery amount, so the holder internal pressure P2 increases, the CO2 concentration decreases, and the CH4 composition ratio increases. On the other hand, in the holder H1, since the inflow amount is smaller than the delivery amount, the pressure P1 decreases, the CO2 concentration increases, and the CH4 composition ratio decreases. Also in this case, as in the case of the stage 1, the composition of the mixed gas after the merging cancels out the changes in the composition of both holder gases and has a small fluctuation range.

FIG. 3 is a diagram showing a temporal transition of the inflow amount and the discharge amount with respect to the gas holders H1 and H2 during this period. In the figure, it can be seen that the integrated value of the inflow amount and the delivery amount in one cycle is equal. FIG. 4 is a diagram conceptually showing temporal transition of CH4, CO2 concentration and mixed gas concentration in the gas holders H1, H2.
Thus, by performing the above-mentioned operation control repeatedly with stage 1 and stage 2 as one cycle, high-density storage is possible while suppressing composition fluctuations using the adsorbent-filled storage holder.

  In the present embodiment, the inflow amount and the delivery amount to each holder are fixed to Va or Vb and switched at regular intervals. However, the present invention is not limited to this, and corresponds to the characteristics / desorption amount and gas composition of the adsorbent. Can be selected as appropriate. The same applies to each of the following embodiments.

  Further, in the present embodiment, the MFC is used for controlling the inflow amount and the sending amount. However, the present invention is not limited to this, and other methods can be adopted. For example, in the gas storage / delivery device 1B of FIG. 5, the pressure (P1 · P2) and temperature (T1 · T2) in the holder are measured, and the opening degree of the orifices 8 to 11 is appropriately adjusted based on this. This makes it possible to perform the same control as in FIG.

  Further, in the gas storage / delivery device 1C of FIG. 6, the upstream side of the holder is the same as the gas storage / delivery device 1A, but the downstream side is replaced with the MFC and regulators R1 and R2, three-way valves 12a and 12b, needle valve 13a.・ 13b is used. The flow rates flowing through the pipes L3 and L5 are controlled to be constant (for example, Va and Vb, respectively) by the regulators R1 and R2. In the stage 1, the delivery gas from the holder H1 passes through the three-way valve 12a → the needle valve 13b, and the delivery gas from the holder H2 passes through the three-way valve 12b → the needle valve 13b, and is merged in the pipe L5. In stage 2, by switching the three-way valves 12a and 12b, the delivery gas from the holder H1 passes through the three-way valve 12a → the pipe L7 → the needle valve 13b, while the delivery gas from the holder H2 is sent to the three-way valve 12b → the pipe L8 → It goes through the needle valve 13a. Then, it merges with the piping L6. Thus, in the gas storage / delivery device 1C, the same control as that of the gas storage / delivery device 1A can be performed without adjusting the needle valve opening on the downstream side of the holder for each stage.

(Second embodiment)
Next, another embodiment of the present invention will be described with reference to FIGS. This embodiment is an operation control method that assumes non-use of consumer equipment at night.
FIG. 7 is a diagram showing a storage and delivery control flow in the present embodiment. FIG. 8 is a diagram showing temporal transition of the inflow amount and the delivery amount of the gas holders H1 and H2. In addition, since the structure of an apparatus is the same as 1st embodiment, illustration and description are abbreviate | omitted.

  Referring to FIG. 7, in stage 1, the inflow amounts to holders H1 and H2 are set to V1i = 0 and V2i = Va, respectively, and the delivery amounts are set to V1o = Vb ′ and V2o = Vc ′, respectively (step S201). . In this case, Vb ′> Va> Vc ′. Under this condition, the operation is continued for a certain time (for example, 12 hours). During this time, since only the delivery is performed in the holder H1, the pressure P1 decreases, the CO2 concentration of the delivery gas increases, and the CH4 concentration decreases. On the other hand, in the holder H2, the inflow amount is greater than the delivery amount, so that the pressure P2 in the holder increases, the CO2 concentration of the delivery gas decreases, and the CH4 concentration increases.

  In stage 2, the inflow amount is maintained at V1i = 0 and V2i = Va, and the delivery amount is changed to V1o = V2o = 0 (step S202). As a result, the gas composition at the time of switching is maintained in the holder H1, while the holder internal pressure P2 further increases in the holder H2.

  In stage 3, the inflow amount and the delivery amount are reversed from those in stage 1. That is, the inflow amounts to the holders H1 and H2 are set to V1i = Va and V2i = 0, respectively, and the delivery amounts from the holders H1 and H2 are set to V1o = Vc ′ and V2o = Vb ′, respectively (step S203). As a result, inflow amount> delivery amount in the holder H1, the holder internal pressure P1 rises, the CO2 concentration of the delivery gas decreases, and the CH4 concentration increases. On the other hand, since only the delivery is performed in the holder H2, the pressure P2 in the holder decreases, the CO2 concentration of the delivery gas increases, and the CH4 concentration decreases.

  In stage 4, the inflow amount is maintained as it is V1i = Va and V2i = 0, and the sending amount is set to V1o = V2o = 0 (step S204). As a result, the holder internal pressure P1 further increases in the holder H1. On the other hand, the gas composition at the time of switching is maintained in the holder H2.

As described above, it is possible to supply the gas with little composition fluctuation by absorbing the composition fluctuation accompanying the adsorption / desorption in each holder through the stages 1 to 4 by mixing.
FIG. 8 shows the temporal transition of the inflow amount and the delivery amount in one cycle. Also in this embodiment, it can be seen that the integrated value of the inflow amount and the delivery amount in one cycle is equal.

(Third embodiment)
Furthermore, another embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a diagram showing an overall configuration of the gas storage / delivery device 20 according to the present embodiment. FIG. 10 is a diagram showing a digestion gas storage and delivery control flow of the present embodiment. FIG. 11 is a diagram showing a temporal transition of the inflow amount and the delivery amount of the gas holders H1 to H3 in one cycle.

  Referring to FIG. 9, the configuration of the gas storage / delivery device 20 according to this embodiment is different from the gas storage / delivery device 1 </ b> A according to the first embodiment in that it further includes an adsorbent-filled gas holder H <b> 3. It is. Further, MFCs 3c and 4c are provided on the upstream side and the downstream side of the gas holder H3. Since the other configuration is the same as that of the gas storage and delivery apparatus 1A, a duplicate description is omitted.

Referring to FIG. 10, in stage 1, the inflow amounts of the holders are set to V1i = 0, V2i = Va, V3i = Va, and the delivery amounts are set to V1o = Va ′, V2o = Vb ′, and V3o = Vb ′, respectively. (Step S301). In this case, Va> Vb ′,
Va ′> Vb ′. Under this condition, the operation is continued for a certain time (for example, 12 hours). During this time, the pressure in the holder changes at high P2 and P3 and low at P1. Correspondingly, the CH4 concentration (C1n: n = 1-3) of the gas delivered from each holder is high in C12 and C13 and low in C11.

  In stage 2, each holder inflow amount is changed to V1i = Va, V2i = 0, V3i = Va, and the delivery amount is changed to V1o = Vb ', V2o = Va', V3o = Vb '(step S302). By continuing operation under these conditions, the pressure in the holder becomes P3> P1> P2, and the CH4 concentration of the gas sent from each holder corresponding to this becomes C13> C11> C12.

In stage 3, each holder inflow amount is changed to V1i = Va, V2i = 0, V3i = 0, and the delivery amount is changed to V1o = Vb ′, V1o = Vb ′, V2o = Va ′ (step S305). By continuing the operation for a certain time under these conditions, the pressure in the holder becomes P3>P1> P2, and the CH4 concentration of the gas sent from each holder corresponding to this becomes C13>C11> C12.
Operation control is repeatedly performed by setting the above stages 1 to 3 as one cycle. As in the first embodiment, the integrated value of the inflow amount and the delivery amount in one cycle is the same (see FIG. 11).

(Fourth embodiment)
Furthermore, another embodiment of the present invention will be described with reference to FIGS. This embodiment is an operation control method that uses three holders (three towers) as in the third embodiment and assumes that no consumer equipment is used at night as in the second embodiment. Since the apparatus configuration of the present embodiment is the same as that of the third embodiment, illustration and description thereof are omitted.
FIG. 12 is a diagram showing a digestion gas storage and delivery control flow in the present embodiment. FIG. 13 is a diagram showing temporal transition of the inflow amount and the delivery amount in one cycle.

In stage 1, the inflow amounts of the holders are set to V1i = 0, V2i = Va, V3i = 0, and the sending amounts are set to V1o = Va ′, V1o = Vb ′, and V2o = Vc ′, respectively (step S401). In this case, Va> Vb ′> Vc ′,
Va ′> Vb ′> Vc ′. Under this condition, the operation is continued for a certain time (for example, 12 hours). During this time, the pressure inside the holder becomes P2>P3> P1, and the CH4 concentration (C1n: n = 1-3) of the gas sent from each holder corresponding to this becomes C12>C13> C11.

  In stage 2, the inflow amounts are maintained as they are: V1i = 0, V2i = Va, V3i = 0, and the sending amount is set to V1o = V2o = V3o = 0 (step S402). The operation is continued for a certain time under these conditions. As a result, the gas composition at the time of switching is maintained in the holders H1 and H3. On the other hand, since only the inflow occurs in the holder H2, the in-holder pressure P2 further increases.

In stage 3, each holder inflow amount is changed to V1i = 0, V2i = 0, V3i = Va, and the delivery amount is changed to V1o = Vc ′, V1o = Va ′, V2o = Vb ′ (step S403). By continuing the operation for a certain time under these conditions, the pressure in the holder becomes P3>P1> P2, and the CH4 concentration of the gas sent from each holder corresponding to this becomes C13>C11> C12.
In stage 4, the inflow amounts are maintained at V1i = 0, V2i = 0, V3i = Va, and the sending amount is set to V1o = V2o = V3o = 0 (step S404). By continuing the operation for a certain time under these conditions, the gas composition at the time of switching is maintained in the holders H1 and H2, while the holder internal pressure P3 further increases in the holder H3.

  In stage 5, the holder inflow amounts are changed to V1i = Va, V2i = 0, V3i = 0, and the delivery amounts are changed to V1o = Vb ', V1o = Vc', V2o = Va '(step S405). By continuing the operation for a certain time under these conditions, the pressure in the holder becomes P3> P1> P2, and the CH4 concentration of the gas sent from each holder corresponding to this becomes C13> C11> C12.

In stage 6, the inflow amounts are maintained as they are V1i = Va, V2i = 0, V3i = 0, and the sending amount is set to V1o = V2o = V3o = 0 (step S406). By continuing the operation for a certain time under these conditions, the gas composition at the time of switching is maintained in the holders H2 and H3, while the holder internal pressure P1 further increases in the holder H1.
Operation control is repeatedly performed by setting the above-described stage 1 to stage 6 as one cycle.
FIG. 11 is a diagram showing temporal transition of the inflow amount and the delivery amount in one cycle. Also in the figure, the integrated value of the inflow amount and the delivery amount in one cycle is equal.

(Fifth embodiment)
Further, another embodiment of the present invention will be described with reference to FIG. The configuration of the gas storage / delivery device 30 according to the present embodiment is different from the gas storage / delivery method and device 1A according to the first embodiment, in that a high calorific gas supply pipe such as city gas is provided in the pipe L6 route after joining. L9 is provided, and a high calorific gas is added to the delivery gas in the mixer 32 and supplied. The mixing amount can be controlled by measuring the calorific value of the delivery gas with the calorimeter 31 and maintaining a constant calorific value. Thereby, further heat increase and heat quantity stabilization are attained.

Hereinafter, each Example based on this invention is described.
Example 1
A mixed gas (67% CH4-33% CO2) was flowed into a 500 ml storage container filled with activated carbon at 11 ml / min, and the gas was simultaneously sent out from the container at 31 ml / min. FIG. 15A is a diagram showing the relationship between the pressure change and the CH4 concentration when the above operation is performed from a state where the same mixed gas is stored at 0.6 MPa in advance. It can be seen that the CH4 concentration decreases as the pressure decreases. The fluctuation range of the CH4 concentration at this time was 73.8 to 53.8%. FIG. 5B shows the same mixed gas flowing in at 32 ml / min and delivered at 14 ml / min. It can be seen that the CH4 concentration increases with increasing pressure. The fluctuation range of the CH4 concentration at this time was 76.7 to 55.7%. Note that gas chromatography was used for measurement of the CH4 concentration.

(Example 2)
Assuming flow rate control similar to that of the first embodiment by the gas storage and delivery device 1A, the CH4 concentration temporal change was simulated. As the storage container (corresponding to the holder H1 and the like), the same 500 ml as in Example 1 was used. The test conditions are as shown in Table 1. FIG. 16 is a diagram showing a change in the mixed gas concentration in stage 1. The fluctuation range of the CH4 concentration is 69.8 to 59.5%, which is smaller than the fluctuation range of the CH4 concentration when the delivery gas is not mixed.

(Example 3)
The present example is a simulation assuming that the consumer device is not used at night (corresponding to the third embodiment described above). The test conditions are shown in Table 2, and the composition variation of the mixed gas in stage 1 is shown in FIG. The fluctuation range of the CH4 concentration was 70.8 to 60.2%. Also in this case, it was proved that the same CH4 concentration fluctuation suppressing effect as in Example 2 was obtained.

Example 4
Similar to the third embodiment, the present embodiment is also a simulation assuming a transmission suspension time zone. However, the lower limit pressure is set to 0.1 MPa. Table 3 shows the test conditions, and FIG. 18 shows the composition variation of the mixed gas in stage 1. It can be seen that the fluctuation range of the CH4 concentration is 69.1 to 62.1%, and the fluctuation range further decreases. Thereby, it was shown that the CH4 concentration fluctuation can be further suppressed by reducing the pressure swing width.

(Example 5)
In this embodiment, three containers (three towers) are used and there is no delivery pause time. Table 5 shows the test conditions, and FIG. 19 shows the composition variation of the mixed gas in stage 1. The fluctuation range of the CH4 concentration is 70.3 to 65.9%, and it can be seen that the CH4 concentration fluctuation suppressing effect is further increased as compared with Example 2 (two-column type).

(Example 6)
It is the simulation which assumed the sending stop time zone using three containers (three tower type) like Example 5. Table 6 shows the test conditions, and FIG. 20 shows the composition variation of the mixed gas in stage 1. The fluctuation range of the CH4 concentration is 69.5 to 67.2%, and it can be seen that the fluctuation range further decreases.

  The present invention is not limited to digestion gases such as sewage treatment and livestock waste treatment, but can be widely used in systems that store a mixed gas composed of a plurality of gas components at high density.

It is a figure showing the whole gas storage delivery device 1A composition concerning a first embodiment. It is a figure which shows the storage delivery control flow of the digestive gas in 1st embodiment. It is a figure which shows the time transition of the inflow amount of gas holders H1 and H2 in 1st embodiment, and the sending-out amount. It is a figure which shows notionally time transition of CH4 concentration in gas holders H1 and H2. It is a figure which shows the gas storage delivery apparatus 1B which is a variation of 1st embodiment. It is a figure showing gas storage and delivery device 1C which is a variation of a first embodiment. It is a figure which shows the storage transmission control flow in 2nd embodiment. It is a figure which shows the time transition of the inflow amount of gas holders H1 and H2 in 2nd embodiment, and the sending-out amount. It is a figure which shows the whole structure of the gas storage delivery apparatus 20 which concerns on 3rd embodiment. It is a figure which shows the storage delivery control flow of the digestive gas in 3rd embodiment. It is a figure which shows the time transition of the inflow amount of gas holder H1 thru | or H3 in 3rd embodiment, and the sending-out amount. It is a figure which shows the storage delivery control flow of the digestive gas in 4th embodiment. It is a figure which shows the time transition of the inflow amount of gas holder H1 thru | or H3 in 4th embodiment, and the sending-out amount. It is a figure which shows the whole structure of the gas storage delivery apparatus 30 which concerns on 5th embodiment. It is a figure which shows the relationship between the pressure change in the container in Example 1, and CH4 density | concentration. It is a figure which shows the CH4 density | concentration fluctuation | variation in the container in Example 2, and mixed gas. It is a figure which shows the CH4 density | concentration fluctuation | variation in the container in Example 3, and mixed gas. It is a figure which shows the CH4 density | concentration fluctuation | variation in the container in Example 4, and mixed gas. It is a figure which shows the CH4 density | concentration fluctuation | variation in the container in Example 5, and mixed gas. It is a figure which shows the CH4 density | concentration fluctuation | variation in the container in Example 6, and mixed gas. It is a figure which shows the whole structure of the conventional gas storage delivery apparatus 100. FIG.

Explanation of symbols

1, 1A, 1B, 1C, 20, 30 Gas storage and delivery device 3a, 3b, 4a, 4b Mass flow controller (MFC)
8-11 Orifice 12a, 12b Three-way valve 13a, 13b Needle valve H1-H3 Adsorbent filled gas holder L1-L8 Pipe L9 High calorific gas supply pipe R1, R2 Regulator CU Control unit T1, T2 Gas holder internal temperature P1, P2 Gas Holder internal pressure

Claims (8)

A gas storage and delivery method in which a target gas containing a plurality of components having different amounts of adsorption and desorption with respect to an adsorbent at the same pressure is distributed and stored in a plurality of storage holders filled with the adsorbent, and mixed and sent downstream of the storage holder. Because
By controlling the amount of inflow and delivery to each storage holder and adjusting the storage pressure as appropriate, the gas composition of the delivery gas differs for each storage holder,
A gas storage and delivery method characterized by controlling a physical quantity to be managed of a delivery gas after mixing within a desired range. The gas storage and delivery method according to claim 1, wherein the target gas is a digestion gas mainly composed of methane (CH 4) and carbon dioxide (CO 2). The gas storage and delivery method according to claim 1, wherein the target gas is city gas. The gas storage and delivery method according to claim 1, wherein the management target physical quantity is a delivery gas heat quantity. 4. The gas storage and delivery method according to claim 1, wherein the managed physical quantity is a delivery gas composition fluctuation range. The gas storage and delivery method according to claim 1, wherein the physical quantity to be managed is one or both of a Wobbe index and a gas combustion rate index. The gas storage and delivery method according to claim 1, wherein a high calorific gas is further added to the delivery gas after mixing. A plurality of storage holders filled with adsorbents;
Means for distributing and storing target gases containing a plurality of components having different amounts of adsorption and desorption with respect to the adsorbent at the same pressure in each storage holder;
Means for mixing and feeding downstream of the storage holder;
Means for controlling the inflow amount and the delivery amount for each storage holder so that the physical quantity to be managed of the delivery gas after mixing is within a desired range;
A gas storage and delivery device comprising:

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