JP5061265B1

JP5061265B1 - Method and apparatus for controlling the amount of component adjustment gas injected into a city gas conduit in a biogas utilization system

Info

Publication number: JP5061265B1
Application number: JP2012126120A
Authority: JP
Inventors: 暢大中村; 智裕丸山; 博之向; 誠棚橋; 勝生松本; 博司宮本; 豪瀧村; 務長岡
Original assignee: CITY OF KOBE; Kobelco Eco Solutions Co Ltd
Current assignee: CITY OF KOBE; Shinko Pantec Co Ltd
Priority date: 2012-06-01
Filing date: 2012-06-01
Publication date: 2012-10-31
Anticipated expiration: 2032-06-01
Also published as: JP2013249404A

Abstract

【課題】本発明は、中圧ガスホルダーから利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管へ導く場合にも、バイオガス利用システム内の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法及び装置を提供することにある。
【解決手段】圧力計４で測定された圧力と予め求められた貯蔵された精製ガスの圧力と成分調整ガスの都市ガス導管２８へ注入可能な注入量との関係より、前記成分調整ガスの都市ガス導管２８への注入量を注入量調整手段により増減させる注入量制御工程を有している。
【選択図】図１
An object of the present invention is to increase or decrease the amount of purified gas supplied from a medium pressure gas holder to a utilization facility or the like, and to obtain a predetermined composition and concentration required by city gas for purified gas stored in the medium pressure gas holder. Even when the component-adjusted gas, which is the gas obtained by adjusting the gas, is introduced to the city gas conduit, the predetermined flow rate and the predetermined minimum pressure of the purified gas used in the utilization equipment in the biogas utilization system are secured. It is an object of the present invention to provide a method and apparatus for controlling the injection amount of a component adjustment gas into a city gas conduit in a biogas utilization system.
According to the relationship between the pressure measured by the pressure gauge, the pressure of the stored purified gas determined in advance and the injection amount of the component adjustment gas that can be injected into the city gas conduit, the city of the component adjustment gas is obtained. An injection amount control step of increasing or decreasing the injection amount into the gas conduit 28 by the injection amount adjusting means is provided.
[Selection] Figure 1

Description

本発明は、バイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法及び装置に関する。ここで「バイオガス」とは、バイオマス（動植物に由来する有機物であってエネルギー源として利用することができるものであり、原油、天然ガス、可燃性天然ガス及び石炭並びにこれらから製造される製品を除くもの）から発生するまたは由来する可燃性ガスを言う。 The present invention relates to a method and an apparatus for controlling the amount of component adjustment gas injected into a city gas conduit in a biogas utilization system. Here, “biogas” refers to biomass (organic matter derived from animals and plants, which can be used as an energy source, and includes crude oil, natural gas, combustible natural gas, coal, and products produced therefrom. Excludes flammable gas generated or derived from.

下水汚泥や生ごみといった有機性廃棄物や食品工場排水などの有機性排水等のバイオマスをメタン発酵させることにより得られるバイオガスが、新しいエネルギーとして注目されている。このメタン発酵処理され、発生したバイオガスは通常「消化ガス」と呼ばれ、この消化ガス中から少なくとも硫黄系不純物を分離精製した精製ガスを中圧ガスホルダーに貯蔵した後、この精製ガスを各種設備で利用するバイオガス利用システムが知られている（例えば、特許文献１参照）。 Biogas obtained by methane fermentation of biomass such as organic waste such as sewage sludge and garbage and organic wastewater such as food factory effluent is attracting attention as a new energy. The biogas generated by this methane fermentation treatment is usually called “digestion gas”. After storing the purified gas, which has separated and purified at least sulfur impurities from the digested gas, in the medium pressure gas holder, Biogas utilization systems used in facilities are known (for example, see Patent Document 1).

この特許文献１に開示された技術では、中圧ガスホルダーに貯蔵された精製ガスがガスタービンに供給されるとともに、その他の諸利用設備へも送給されるように構成されている。 In the technique disclosed in Patent Document 1, the purified gas stored in the medium pressure gas holder is supplied to the gas turbine and is also supplied to other utilization facilities.

特開２００３−８３０８５号公報JP 2003-83085 A

しかし、上記特許文献１に記載された発明において、中圧ガスホルダーから諸利用設備としてのガス用品に供給するために、中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管へ注入しようとする場合、低圧ガスホルダーの貯留量に従ってガス圧縮機を制御するとともに、ガスを圧縮して供給する必要があるガスタービンやその他の諸利用設備（以下、「利用設備等」という）で消費される（中圧ガスホルダーから供給する）精製ガスの量が例えば日中のように一定の時間帯に増加するにもかかわらず成分調整ガスの都市ガス導管への注入量を一定に制御していると、以下のような問題が生ずる。
（１）中圧ガスホルダーに貯蔵された精製ガスの圧力（以下、「貯蔵された精製ガスの圧力」という）が次第に低下し、前記利用設備等で利用される前記精製ガスの所定の最低圧力が確保できなくなる時間帯が発生するといった問題点を有していた。
（２）また、上述した前記精製ガスの所定の最低圧力が確保できなくなる時間帯が発生するばかりか、翌朝必要な所定の貯蔵された精製ガスの圧力が確保できなくなる場合が発生するといった問題点も有していた。 However, in the invention described in the above-mentioned Patent Document 1, in order to supply gas supplies as various utilization facilities from the intermediate pressure gas holder, a predetermined composition required by the city gas for the purified gas stored in the intermediate pressure gas holder When the component adjustment gas, which is the gas obtained by adjusting the gas concentration, is to be injected into the city gas conduit, it is necessary to control the gas compressor according to the amount stored in the low-pressure gas holder and supply the compressed gas The amount of refined gas (supplied from the medium-pressure gas holder) consumed by a certain gas turbine and other utilization facilities (hereinafter referred to as “utilization facilities”) increases for a certain period of time, such as during the daytime However, if the amount of the component adjustment gas injected into the city gas conduit is controlled to be constant, the following problems occur.
(1) The pressure of the purified gas stored in the medium-pressure gas holder (hereinafter referred to as “the pressure of the stored purified gas”) gradually decreases, and the predetermined minimum pressure of the purified gas used in the use facility or the like However, there is a problem that a time zone that cannot be secured occurs.
(2) Further, there is a problem that not only a time zone in which the above-mentioned predetermined minimum pressure of the purified gas cannot be ensured but also a case in which the pressure of the predetermined stored purified gas necessary for the next morning cannot be secured is generated. Also had.

本発明の目的は、中圧ガスホルダーから利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管へ導く場合にも、バイオガス利用システム内の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法及び装置を提供することにある。 The purpose of the present invention is to increase or decrease the amount of purified gas supplied from the intermediate pressure gas holder to the utilization facility, etc., and to obtain the purified gas stored in the intermediate pressure gas holder at a predetermined composition and concentration required by city gas. Even when the component adjustment gas, which is the gas obtained by adjustment, is led to the city gas conduit, ensure the prescribed flow rate and the prescribed minimum pressure of the purified gas used in the equipment used in the biogas utilization system. It is an object of the present invention to provide a method and an apparatus for controlling the amount of component-adjusted gas injected into a city gas conduit in a biogas utilization system capable of performing the above.

この目的を達成するために、本発明の請求項１に記載の発明は、
バイオガス中から少なくとも硫黄系不純物を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置と、このバイオガス精製装置で得られた精製ガスを貯蔵する中圧ガスホルダーと、この中圧ガスホルダーに貯蔵された精製ガスが供給され利用される所定の利用設備と、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整するための成分調整手段と、この成分調整手段により所定の組成と濃度に調整されたガス（以下、「成分調整ガス」という）を都市ガス導管へ導くための配管と、を備えたバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法であって、
前記中圧ガスホルダーに貯蔵された精製ガス（以下、「貯蔵された精製ガス」という）の圧力を測定するための圧力計と、前記配管の途中経路または前記成分調整手段に注入量調整手段とをさらに備え、
（１）前記所定の利用設備で利用される前記精製ガスの所定流量と所定の最低圧力を確保するために、前記圧力計で測定した前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係を予め求めておく工程と、
（２）前記所定の利用設備に前記精製ガスを供給する際に、前記貯蔵された精製ガスの圧力を前記圧力計で測定し、この測定された圧力と前記（１）で求められた前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係より、前記成分調整ガスの前記都市ガス導管への注入量を前記注入量調整手段により増減させる注入量制御工程と、
を有したことを特徴とするバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法である。 In order to achieve this object, the invention according to claim 1 of the present invention provides:
A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. A method for controlling the amount of injection into a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; Further comprising
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A step of determining in advance a relationship with an injection amount that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the storage determined in (1) Injection that increases or decreases the injection amount of the component adjustment gas into the city gas conduit by the injection amount adjusting means based on the relationship between the pressure of the purified gas and the injection amount of the component adjustment gas that can be injected into the city gas conduit A quantity control process;
This is a method for controlling the amount of component-adjusted gas injected into a city gas conduit in a biogas utilization system.

また、本発明の請求項２に記載の発明は、
バイオガス中から少なくとも硫黄系不純物を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置と、このバイオガス精製装置で得られた精製ガスを貯蔵する中圧ガスホルダーと、この中圧ガスホルダーに貯蔵された精製ガスが供給され利用される所定の利用設備と、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整するための成分調整手段と、この成分調整手段により所定の組成と濃度に調整されたガス（以下、「成分調整ガス」という）を都市ガス導管へ導くための配管と、を備えたバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御装置であって、
前記中圧ガスホルダーに貯蔵された精製ガス（以下、「貯蔵された精製ガス」という）の圧力を測定するための圧力計と、前記配管の途中経路または前記成分調整手段に注入量調整手段とを備え、
（１）前記所定の利用設備で利用される前記精製ガスの所定流量と所定の最低圧力を確保するために、前記圧力計で測定した前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係を予め求めたデータが格納された記憶部と、
（２）前記所定の利用設備に前記精製ガスを供給する際に、前記貯蔵された精製ガスの圧力を前記圧力計で測定し、この測定された圧力と前記記憶部に格納された前記データとの関係より、前記注入量調整手段で前記成分調整ガスの前記都市ガス導管へ注入可能な注入量を算出するための注入量算出部と、
を有したことを特徴とするバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御装置である。 The invention according to claim 2 of the present invention is
A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. An injection amount control device for a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; With
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A storage unit storing data obtained in advance for the relationship with the amount of injection that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the data stored in the storage unit From the relationship, an injection amount calculation unit for calculating the injection amount that can be injected into the city gas conduit of the component adjustment gas by the injection amount adjustment means,
An apparatus for controlling the amount of component-adjusted gas injected into a city gas conduit in a biogas utilization system.

以上のように、本発明に係るバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法によれば、
バイオガス中から少なくとも硫黄系不純物を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置と、このバイオガス精製装置で得られた精製ガスを貯蔵する中圧ガスホルダーと、この中圧ガスホルダーに貯蔵された精製ガスが供給され利用される所定の利用設備と、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整するための成分調整手段と、この成分調整手段により所定の組成と濃度に調整されたガス（以下、「成分調整ガス」という）を都市ガス導管へ導くための配管と、を備えたバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法であって、
前記中圧ガスホルダーに貯蔵された精製ガス（以下、「貯蔵された精製ガス」という）の圧力を測定するための圧力計と、前記配管の途中経路または前記成分調整手段に注入量調整手段とをさらに備え、
（１）前記所定の利用設備で利用される前記精製ガスの所定流量と所定の最低圧力を確保するために、前記圧力計で測定した前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係を予め求めておく工程と、
（２）前記所定の利用設備に前記精製ガスを供給する際に、前記貯蔵された精製ガスの圧力を前記圧力計で測定し、この測定された圧力と前記（１）で求められた前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係より、前記成分調整ガスの前記都市ガス導管への注入量を前記注入量調整手段により増減させる注入量制御工程と、を有しているため、
中圧ガスホルダーから利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管へ導く場合にも、バイオガス利用システム内の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御方法を実現できる。 As described above, according to the method for controlling the injection amount of the component adjustment gas into the city gas conduit in the biogas utilization system according to the present invention,
A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. A method for controlling the amount of injection into a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; Further comprising
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A step of determining in advance a relationship with an injection amount that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the storage determined in (1) Injection that increases or decreases the injection amount of the component adjustment gas into the city gas conduit by the injection amount adjusting means based on the relationship between the pressure of the purified gas and the injection amount of the component adjustment gas that can be injected into the city gas conduit A quantity control step,
It is obtained by adjusting the amount of purified gas supplied from the medium pressure gas holder to the utilization facility, etc., and adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas. Use of biogas that can ensure the prescribed flow rate and the prescribed minimum pressure of purified gas used in the equipment used in the biogas utilization system, etc. It is possible to realize a method of controlling the injection amount of the component adjustment gas into the city gas conduit in the system.

また、本発明に係るバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御装置によれば、
バイオガス中から少なくとも硫黄系不純物を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置と、このバイオガス精製装置で得られた精製ガスを貯蔵する中圧ガスホルダーと、この中圧ガスホルダーに貯蔵された精製ガスが供給され利用される所定の利用設備と、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整するための成分調整手段と、この成分調整手段により所定の組成と濃度に調整されたガス（以下、「成分調整ガス」という）を都市ガス導管へ導くための配管と、を備えたバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御装置であって、
前記中圧ガスホルダーに貯蔵された精製ガス（以下、「貯蔵された精製ガス」という）の圧力を測定するための圧力計と、前記配管の途中経路または前記成分調整手段に注入量調整手段とを備え、
（１）前記所定の利用設備で利用される前記精製ガスの所定流量と所定の最低圧力を確保するために、前記圧力計で測定した前記貯蔵された精製ガスの圧力と前記成分調整ガスの前記都市ガス導管へ注入可能な注入量との関係を予め求めたデータが格納された記憶部と、
（２）前記所定の利用設備に前記精製ガスを供給する際に、前記貯蔵された精製ガスの圧力を前記圧力計で測定し、この測定された圧力と前記記憶部に格納された前記データとの関係より、前記注入量調整手段で前記成分調整ガスの前記都市ガス導管へ注入可能な注入量を算出するための注入量算出部と、を有しているため、
中圧ガスホルダーから利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダーに貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管へ導く場合にも、バイオガス利用システム内の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管への注入量制御装置を実現できる。 Moreover, according to the injection amount control device to the city gas conduit of the component adjustment gas in the biogas utilization system according to the present invention,
A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. An injection amount control device for a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; With
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A storage unit storing data obtained in advance for the relationship with the amount of injection that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the data stored in the storage unit From the relationship, because there is an injection amount calculation unit for calculating the injection amount that can be injected into the city gas conduit of the component adjustment gas by the injection amount adjustment means,
It is obtained by adjusting the amount of purified gas supplied from the medium pressure gas holder to the utilization facility, etc., and adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas. Use of biogas that can ensure the prescribed flow rate and the prescribed minimum pressure of purified gas used in the equipment used in the biogas utilization system, etc. An apparatus for controlling the injection amount of the component adjustment gas into the city gas conduit in the system can be realized.

本発明に係る注入量制御装置を含むバイオガス利用システムの一実施の形態の全体構成を模式的に説明する説明図である。It is explanatory drawing which illustrates typically the whole structure of one Embodiment of the biogas utilization system containing the injection quantity control apparatus which concerns on this invention. 本発明に係る、中圧ガスホルダーに貯蔵された精製ガスの圧力と成分調整ガスの都市ガス導管へ注入可能な注入量との関係を予め求めたデータの一例を説明する図である。It is a figure explaining an example of the data which calculated | required previously the relationship between the pressure of the refined gas stored in the intermediate pressure gas holder and the injection amount which can be inject | poured into the city gas conduit | pipe of component adjustment gas based on this invention. 本発明に係る、成分調整ガスの都市ガス導管への注入量制御方法を用いた場合の、所定の利用設備で利用される精製ガスの流量と中圧ガスホルダーの圧力の推移の一例を説明する図である。An example of the transition of the flow rate of purified gas and the pressure of the medium pressure gas holder used in a predetermined utilization facility when using the method for controlling the injection amount of the component adjustment gas into the city gas conduit according to the present invention will be described. FIG. 成分調整ガスの都市ガス導管への注入量を一定に制御した場合の、所定の利用設備で利用される精製ガスの流量と中圧ガスホルダーの圧力の推移の一例を説明する図である。It is a figure explaining an example of transition of the flow of the refined gas used with a predetermined utilization facility, and the pressure of an intermediate pressure gas holder when the injection quantity of the component adjustment gas to the city gas conduit is controlled to be constant. 成分調整ガスの都市ガス導管への注入量を一定に制御し、且つ、設定値を誤った場合の、所定の利用設備で利用される精製ガスの流量と中圧ガスホルダーの圧力の推移の一例を説明する図である。Example of changes in the flow rate of purified gas and the pressure in the medium-pressure gas holder when the amount of component adjustment gas injected into the city gas conduit is controlled to a fixed value and the set value is incorrect. FIG.

以下、本発明の一実施の形態について、添付図面を参照しながら説明する。図１は本発明に係る注入量制御装置を含むバイオガス利用システムの一実施の形態の全体構成を模式的に説明する説明図である。 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an explanatory diagram schematically illustrating the overall configuration of an embodiment of a biogas utilization system including an injection amount control device according to the present invention.

図１において、１は下水汚泥や生ごみといった有機性廃棄物や食品工場排水などの有機性排水等のバイオマスをメタン発酵させるための消化タンク、２は消化タンク１から発生した消化ガス中から硫黄系不純物と二酸化炭素を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置、３はバイオガス精製装置２で精製された精製ガスが供給され約０．４〜０．９ＭＰａＧの範囲の圧力で貯蔵するための中圧ガスホルダー、４は中圧ガスホルダー３内の精製ガスの圧力を計測するための圧力計、５は利用設備としてのＣＮＧ車へのガス充填設備（図示せず。例えば、所定の最低圧力＝０．５ＭＰａＧ）に精製ガスを供給するために精製ガスに付臭剤（ＴＨＴ）を用いて付臭するための付臭装置、６は減圧弁、７は付臭剤（ＴＨＴ）を用いて付臭された精製ガスが減圧弁６で所定圧力に減圧され供給される利用設備としての消化タンク１の加温用ボイラーである。 In FIG. 1, 1 is a digestion tank for methane fermentation of biomass such as organic waste such as sewage sludge and garbage and organic wastewater such as food factory wastewater, 2 is sulfur from digestion gas generated from the digestion tank 1 A biogas purification device for separating system impurities and carbon dioxide and purifying high-concentration methane gas, 3 is supplied with purified gas purified by the biogas purification device 2, and is in the range of about 0.4 to 0.9 MPaG An intermediate pressure gas holder for storing pressure, 4 is a pressure gauge for measuring the pressure of the purified gas in the intermediate pressure gas holder 3, and 5 is a gas filling facility (not shown) for a CNG vehicle as a utilization facility. For example, in order to supply purified gas to a predetermined minimum pressure = 0.5 MPaG), an odorizing device for odorizing purified gas using an odorant (THT), 6 is a pressure reducing valve, and 7 is an odorant. (THT) There purified gas is odorized with is boiler heating digestion tank 1 as utilization facility supplied is reduced to a predetermined pressure by the pressure reducing valve 6.

また、図１において、１０は精製ガスを都市ガスが要求する所定基準値未満の二酸化炭素濃度（例えば、０．５容量％）まで低減させるための二酸化炭素除去器、１１は二酸化炭素除去器１０で所定値まで二酸化炭素濃度が低減された精製ガスの流量を計測するための流量計、１２は流量計１１で流量が計測された精製ガスの酸素濃度を測定するための酸素計｛例えば、ガスクロマトグラフ（型式：ＧＣ−２０Ｂ−３Ｓ、株式会社島津製作所製）｝、１３は水素供給手段としての水電解式高純度水素酸素発生装置｛株式会社神鋼環境ソリューション製の水電解式高純度水素酸素発生装置（商品名：ＨＨＯＧ）｝、１４は水電解式高純度水素酸素発生装置１３から供給される水素（Ｈ_２）の流量を計測するための流量計、１５は流量制御装置、１６は流量調整弁である。ここで、水素量調整手段は、流量制御装置１５と流量調整弁１６から構成される。 In FIG. 1, reference numeral 10 denotes a carbon dioxide remover for reducing the purified gas to a carbon dioxide concentration (for example, 0.5% by volume) lower than a predetermined reference value required by city gas, and 11 denotes a carbon dioxide remover 10. A flow meter for measuring the flow rate of the purified gas whose carbon dioxide concentration has been reduced to a predetermined value at 12, and an oxygen meter 12 for measuring the oxygen concentration of the purified gas whose flow rate has been measured by the flow meter 11 {for example, gas chroma TOGRAPH (model: GC-20B-3S, manufactured by Shimadzu Corporation)}, 13 is a water electrolysis type high purity hydrogen oxygen generator as a hydrogen supply means {water electrolysis type high purity hydrogen oxygen generation manufactured by Shinko Environmental Solution Co., Ltd. (trade name: HHOG)}, 14 flow meter for measuring the flow rate of hydrogen (H ₂₎ supplied from the water electrolytic high purity hydrogen and oxygen generator 13, 15 is flow control device 16 is a flow control valve. Here, the hydrogen amount adjusting means includes a flow rate control device 15 and a flow rate adjustment valve 16.

また、図１において、２０はパラジウム（Ｐｄ）触媒が充填された酸素除去触媒塔、２１は酸素除去触媒塔２０で酸素が除去された精製ガスの触媒反応熱を取り去るためのガス冷却器、２２はガス冷却器２１で冷却された精製ガス中の水分を除去するための除湿器、２３は除湿器２２で水分が除去された精製ガスに付臭剤（ＴＢＭ＋ＤＭＳ）を用いて都市ガスとしての付臭を行なうための付臭装置、２４は付臭装置２３で付臭された精製ガスの流量を計測するための流量計、２５は流量計２４で流量が計測された精製ガスの流量を調整するための流量調整弁、２６は遮断弁、２７は減圧弁、２８は都市ガス導管である。 In FIG. 1, 20 is an oxygen removal catalyst tower filled with a palladium (Pd) catalyst, 21 is a gas cooler for removing the catalytic reaction heat of the purified gas from which oxygen has been removed by the oxygen removal catalyst tower 20, 22 Is a dehumidifier for removing moisture in the purified gas cooled by the gas cooler 21, and 23 is a city gas attached to the purified gas from which moisture has been removed by the dehumidifier 22, using an odorant (TBM + DMS). An odorizing device for performing odor, 24 is a flow meter for measuring the flow rate of the purified gas odorized by the odorizing device 23, and 25 is a flow rate of the purified gas whose flow rate is measured by the flow meter 24. A flow regulating valve for the above, 26 is a shutoff valve, 27 is a pressure reducing valve, and 28 is a city gas conduit.

また、図１において、３０は精製ガスに高カロリーガスであるＬＰＧを供給して熱量を調整するための熱量調整装置、３１は熱量調整装置３０から出たＬＰＧの流量を計測するための流量計、３２は流量制御装置、３３は流量調整弁である。 In FIG. 1, 30 is a calorie adjusting device for adjusting the amount of heat by supplying LPG, which is a high calorie gas, to the purified gas, and 31 is a flow meter for measuring the flow rate of the LPG emitted from the calorie adjusting device 30. 32 is a flow rate control device, and 33 is a flow rate adjusting valve.

また、図１において、４０は都市ガス導管２８へ供給する精製ガスの酸素濃度を測定するための酸素計｛例えば、ガスクロマトグラフ（型式：ＧＣ−２０Ｂ−３Ｓ、株式会社島津製作所製）｝、４１は都市ガス導管２８へ供給する精製ガスのその他の成分濃度を測定するための分析計、６０は流量制御装置である。 In FIG. 1, reference numeral 40 denotes an oxygen meter for measuring the oxygen concentration of the purified gas supplied to the city gas conduit 28 {e.g., gas chromatograph (model: GC-20B-3S, manufactured by Shimadzu Corporation)}, 41 Is an analyzer for measuring the concentration of other components of the purified gas supplied to the city gas conduit 28, and 60 is a flow control device.

また、図１において、中圧ガスホルダー３に貯蔵された精製ガスを都市ガスが要求する所定成分の組成と濃度に調整するための成分調整手段は、二酸化炭素除去器１０、流量計１１、酸素計１２、水電解式高純度水素酸素発生装置１３、流量計１４、流量制御装置１５、流量調整弁１６、酸素除去触媒塔２０、ガス冷却器２１、除湿器２２、付臭装置２３、熱量調整装置３０、流量計３１、流量制御装置３２、流量調整弁３３、酸素計４０と分析計４１から構成される。また、上記成分調整手段により所定の組成と濃度に調整されたガス（成分調整ガス）を都市ガス導管２８へ導くための配管２９が、付臭装置２３から都市ガス導管２８の間に設置されている。また、７０は圧力計４と二酸化炭素除去器１０との間の配管、７５は流量計１１と酸素除去触媒塔２０との間の配管、８０は除湿器２２と付臭装置２３との間の配管、８５は付臭装置２３と流量計２４との間の配管である。さらに、流量計２４と遮断弁２６の間の配管２９に設置された流量調整弁２５と流量制御装置６０により注入量調整手段が構成されている。このように、図１では注入量調整手段を配管２９の途中経路に備えた例について示したが、必ずしもこれに限定されるものではなく、上記成分調整手段の配管７０から配管８５の間に備えた構成とすることも可能である。 In FIG. 1, the component adjusting means for adjusting the purified gas stored in the medium pressure gas holder 3 to the composition and concentration of the predetermined components required by the city gas includes a carbon dioxide remover 10, a flow meter 11, oxygen Total 12, water electrolysis type high purity hydrogen oxygen generator 13, flow meter 14, flow controller 15, flow control valve 16, oxygen removal catalyst tower 20, gas cooler 21, dehumidifier 22, odor device 23, calorie adjustment The apparatus 30, the flow meter 31, the flow rate control device 32, the flow rate adjustment valve 33, the oxygen meter 40 and the analyzer 41 are configured. In addition, a pipe 29 for guiding the gas (component adjustment gas) adjusted to a predetermined composition and concentration by the component adjusting means to the city gas conduit 28 is installed between the odorizing device 23 and the city gas conduit 28. Yes. Further, 70 is a pipe between the pressure gauge 4 and the carbon dioxide remover 10, 75 is a pipe between the flow meter 11 and the oxygen removing catalyst tower 20, and 80 is between the dehumidifier 22 and the odorizing device 23. A pipe 85 is a pipe between the odorizing device 23 and the flow meter 24. Further, the flow rate adjusting valve 25 and the flow rate control device 60 installed in the pipe 29 between the flow meter 24 and the shutoff valve 26 constitute an injection amount adjusting means. As described above, FIG. 1 shows an example in which the injection amount adjusting means is provided in the middle path of the pipe 29. However, the present invention is not necessarily limited to this, and is provided between the pipe 70 and the pipe 85 of the component adjusting means. It is also possible to adopt a configuration.

また、バイオガス中から少なくとも硫黄系不純物を分離し、高濃度なメタンガスを精製するためのバイオガス精製装置２と、このバイオガス精製装置２で得られた精製ガスを貯蔵する中圧ガスホルダー３と、この中圧ガスホルダー３に貯蔵された精製ガスが供給され利用される所定の利用設備（例えば、上述したＣＮＧ車）と、中圧ガスホルダー３に貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整するための上述した成分調整手段と、成分調整ガスを都市ガス導管２８へ導くための配管２９と、を備えたバイオガス利用システムにおける成分調整ガスの都市ガス導管２８への注入量制御装置は、
圧力計４と、配管２９の途中経路または上記成分調整手段に上述した注入量調整手段とを備え、
（１）前記所定の利用設備で利用される前記精製ガスの所定流量と所定の最低圧力を確保するために、圧力計４で測定した前記貯蔵された精製ガスの圧力と前記成分調整ガスの都市ガス導管２８へ注入可能な注入量との関係を予め求めたデータが格納された流量制御装置６０内に設けられた記憶部（図示せず）と、
（２）前記所定の利用設備に前記精製ガスを供給する際に、前記貯蔵された精製ガスの圧力を圧力計４で測定し、この測定された圧力と前記記憶部に格納された前記データとの関係より、前記注入量調整手段で前記成分調整ガスの都市ガス導管２８へ注入可能な注入量を算出するための流量制御装置６０内に設けられた注入量算出部（図示せず）と、
を有しているため、
中圧ガスホルダー３から前記所定の利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダー３に貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管２８へ導く場合にも、バイオガス利用システム内の前記所定の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管２８への注入量制御装置を実現できる。 In addition, a biogas purification device 2 for separating at least sulfur impurities from the biogas and purifying high-concentration methane gas, and an intermediate pressure gas holder 3 for storing the purified gas obtained by the biogas purification device 2 The city gas demands a predetermined utilization facility (for example, the above-mentioned CNG vehicle) to which the purified gas stored in the intermediate pressure gas holder 3 is supplied and used, and the purified gas stored in the intermediate pressure gas holder 3 The component adjustment means for adjusting to the predetermined composition and concentration, and the piping 29 for guiding the component adjustment gas to the city gas conduit 28, the city gas conduit 28 for component adjustment gas in the biogas utilization system. The injection amount control device to
The pressure gauge 4 and the injection amount adjusting means described above in the middle path of the pipe 29 or the component adjusting means;
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge 4 and the city of the component adjustment gas A storage unit (not shown) provided in the flow control device 60 in which data obtained in advance for the relationship with the injection amount that can be injected into the gas conduit 28 is stored;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with a pressure gauge 4, and the measured pressure and the data stored in the storage unit are measured. From the relationship, an injection amount calculation unit (not shown) provided in the flow rate control device 60 for calculating the injection amount that can be injected into the city gas conduit 28 of the component adjustment gas by the injection amount adjusting means,
Because it has
The amount of purified gas supplied from the intermediate-pressure gas holder 3 to the predetermined use facility is increased and decreased, and the purified gas stored in the intermediate-pressure gas holder 3 is adjusted to a predetermined composition and concentration required by city gas. Even when the component-adjusted gas, which is a gas obtained by the above, is led to the city gas conduit 28, the predetermined flow rate and the predetermined minimum pressure of the purified gas used in the predetermined utilization facility in the biogas utilization system are set. An apparatus for controlling the amount of component adjustment gas injected into the city gas conduit 28 in the biogas utilization system that can be secured can be realized.

なお、前記記憶部と前記注入量算出部は、流量制御装置６０内にそれぞれ設けられた例について説明したが、必ずしもこれに限定されるものではない。前記記憶部と前記注入量算出部は、流量制御装置６０外に別設されていても構わない。前記記憶部と前記注入量算出部は、少なくとも注入量制御装置内にありさえすればよい。 In addition, although the said memory | storage part and the said injection amount calculation part demonstrated the example each provided in the flow control apparatus 60, it is not necessarily limited to this. The storage unit and the injection amount calculation unit may be separately provided outside the flow rate control device 60. The storage unit and the injection amount calculation unit need only be at least in the injection amount control apparatus.

以下に、本発明の作用効果を検証するための試験（発明例）および比較試験（比較例１、比較例２）を実施した結果について述べる。 Below, the result of having implemented the test (invention example) and the comparative test (comparative example 1 and comparative example 2) for verifying the effect of this invention is described.

最初に、１日を通してのバイオガス精製装置２で精製され得られる精製ガスの流量、所定の利用設備等（例えば、ＣＮＧ車へ所定ガスを供給するためのガス充填設備）で利用される増減する精製ガスの流量を把握した。 First, increase or decrease the flow rate of purified gas that can be purified by the biogas purification device 2 throughout the day, and use in a predetermined use facility (for example, a gas filling facility for supplying a predetermined gas to a CNG vehicle). The flow rate of purified gas was grasped.

次に、上記所定の利用設備等で利用される精製ガスの所定流量と所定の最低圧力を確保するために必要な中圧ガスホルダー３に貯蔵された精製ガスの（圧力計４で測定した）圧力と上述した成分調整ガスの都市ガス導管２８へ注入可能な注入量との関係を予め求め（図２参照）、この図２に示すデータを記憶部へ格納した。 Next, the purified gas stored in the medium pressure gas holder 3 necessary for ensuring the predetermined flow rate and the predetermined minimum pressure of the purified gas used in the predetermined utilization facility (measured with the pressure gauge 4). The relationship between the pressure and the amount of the component adjustment gas that can be injected into the city gas conduit 28 was obtained in advance (see FIG. 2), and the data shown in FIG. 2 was stored in the storage unit.

次に、図３に示すような、バイオガス精製装置２で得られた精製ガスの流量（符号ア）と上記所定の利用設備等で利用される精製ガスの流量（符号ウ）である場合に、中圧ガスホルダー３に貯蔵された精製ガスの圧力を圧力計４で測定し、この測定された圧力（符号エ）と上記記憶部に格納されたデータとの関係より、都市ガス導管２８へ注入可能な上述した成分調整ガスの流量（符号イ）を上記注入量算出部で算出し、この算出したガス流量（符号イ）になるように、上記注入量調整手段で上述した成分調整ガスの流量を制御した（図３参照、発明例）。このように、中圧ガスホルダー３から所定の利用設備等へ供給される精製ガスの量が増減するとともに、前記中圧ガスホルダー３に貯蔵された精製ガスを都市ガスが要求する所定の組成と濃度に調整することにより得られたガスである成分調整ガスを都市ガス導管２８へ導く場合にも、バイオガス利用システム内の所定の利用設備等で利用される精製ガスの増減する所定流量（符号ウ参照）と所定の最低圧力（例えば、０．５ＭＰａＧ）以上を確保することが可能なバイオガス利用システムにおける成分調整ガスの都市ガス導管２８への注入量制御装置を実現できることが分かる。 Next, when the flow rate (symbol A) of the purified gas obtained by the biogas purification apparatus 2 and the flow rate (symbol C) of the purified gas used in the predetermined utilization facility or the like as shown in FIG. Then, the pressure of the purified gas stored in the intermediate pressure gas holder 3 is measured by the pressure gauge 4, and the relationship between the measured pressure (symbol D) and the data stored in the storage unit is sent to the city gas conduit 28. The flow rate (symbol A) of the above-described component adjustment gas that can be injected is calculated by the injection amount calculation unit, and the above-described component adjustment gas flow rate (symbol A) is calculated by the injection amount adjusting unit. The flow rate was controlled (see FIG. 3, invention example). As described above, the amount of the purified gas supplied from the intermediate pressure gas holder 3 to the predetermined utilization facility or the like increases and decreases, and the predetermined composition requested by the city gas for the purified gas stored in the intermediate pressure gas holder 3 is obtained. Even when the component-adjusted gas, which is a gas obtained by adjusting the concentration, is led to the city gas conduit 28, a predetermined flow rate (symbol) of the purified gas used in a predetermined utilization facility in the biogas utilization system is increased or decreased. It can be seen that an apparatus for controlling the injection amount of the component adjustment gas into the city gas conduit 28 in the biogas utilization system capable of ensuring a predetermined minimum pressure (for example, 0.5 MPaG) or more can be realized.

次に、図４において、図３に示すバイオガス精製装置２で得られた精製ガスの流量と同じ精製ガスの流量（符号ア）が得られ、かつ、本発明のような注入量制御装置を有さず、上述した成分調整ガスを都市ガス導管２８へ日量時間平均一律（例えば、８０ｍ^３Ｎ）の流量（符号イ）を供給した（図４参照、比較例１）。このような場合に、上記所定の利用設備等で利用される精製ガスの流量と同じ精製ガスの流量（符号ウ）を利用すると、１８時頃に、圧力計４で測定した中圧ガスホルダー３に貯蔵された精製ガスの圧力（符号エ）が０．４９ＭＰａＧとなってしまい、所定の最低圧力である０．５ＭＰａＧを確保できなくなってしまうため、所定の最低圧力以上へ回復するまで一時的に所定の利用設備等で精製ガスを利用することができない（図４参照、比較例１）。 Next, in FIG. 4, the same purified gas flow rate (symbol A) as the purified gas flow rate obtained by the biogas purification device 2 shown in FIG. Without having the above, the above-mentioned component adjustment gas was supplied to the city gas conduit 28 at a daily flow rate average (for example, 80 m ³ N) (symbol A) (see FIG. 4, Comparative Example 1). In such a case, if the same purified gas flow rate (symbol C) as the purified gas flow rate used in the predetermined utilization facility is used, the medium pressure gas holder 3 measured by the pressure gauge 4 at about 18:00. Since the pressure (symbol D) of the purified gas stored in the tank becomes 0.49 MPaG and the predetermined minimum pressure of 0.5 MPaG cannot be secured, it is temporarily until the pressure recovers to the predetermined minimum pressure or higher. The purified gas cannot be used in a predetermined use facility or the like (see FIG. 4, Comparative Example 1).

また、図５において、図３に示すバイオガス精製装置２で得られた精製ガスの流量と同じ精製ガスの流量（符号ア）が得られ、かつ、本発明のような注入量制御装置を有さず、かつ、誤操作により上述した成分調整ガスを都市ガス導管２８へ日量時間平均一律（例えば、１００ｍ^３Ｎ）の流量（符号イ）を供給してしまった（図５参照、比較例２）。このような場合に、上記所定の利用設備等で利用される精製ガスの流量と同じ精製ガスの流量（符号ウ）を利用すると、１６時前頃から１８時過ぎ頃の間において、圧力計４で測定した中圧ガスホルダー３に貯蔵された精製ガスの圧力（符号エ）が所定の最低圧力である０．５ＭＰａＧを確保できず一時的に所定の利用設備等で精製ガスを利用できなくなってしまうばかりか、翌朝の朝８時には、圧力計４で測定した中圧ガスホルダー３に貯蔵された精製ガスの圧力（符号エ）が約０．６５ＭＰａＧまでしか回復せず、８時から再び図３に示す上記所定の利用設備等で利用される精製ガスの流量（符号ウ）を供給することが出来なくなってしまう（図５参照、比較例２）。 Further, in FIG. 5, the same purified gas flow rate (symbol A) as the purified gas flow rate obtained by the biogas purification device 2 shown in FIG. 3 is obtained, and the injection amount control device of the present invention is provided. In addition, the above-mentioned component adjustment gas was supplied to the city gas conduit 28 at a daily flow rate average (for example, 100 m ³ N) due to an erroneous operation (see FIG. 5, see Comparative Example 2). ). In such a case, if the purified gas flow rate (symbol C) that is the same as the purified gas flow rate used in the predetermined utilization facility or the like is used, the pressure gauge 4 can be used between about before 16:00 and after about 18:00. The pressure of the refined gas stored in the medium pressure gas holder 3 measured in step (symbol d) cannot be ensured at a predetermined minimum pressure of 0.5 MPaG, and the refined gas cannot be used temporarily at a prescribed use facility. In addition, at 8 am the next morning, the pressure (symbol d) of the purified gas stored in the medium pressure gas holder 3 measured with the pressure gauge 4 recovers only to about 0.65 MPaG, and again from FIG. It becomes impossible to supply the flow rate (symbol c) of the purified gas used in the predetermined utilization facility shown in FIG. 5 (see FIG. 5, Comparative Example 2).

なお、本実施の形態においては、二酸化炭素除去器１０、流量計１１、酸素計１２、水電解式高純度水素酸素発生装置１３、流量計１４、流量制御装置１５、流量調整弁１６、酸素除去触媒塔２０、ガス冷却器２１、除湿器２２、付臭装置２３、熱量調整装置３０、流量計３１、流量制御装置３２、流量調整弁３３、酸素計４０と分析計４１から構成された成分調整手段の例について説明したが、必ずしもこれに限定されるものではなく、様々な形態の成分調整手段を用いることが可能である。 In the present embodiment, the carbon dioxide remover 10, the flow meter 11, the oxygen meter 12, the water electrolysis high-purity hydrogen oxygen generator 13, the flow meter 14, the flow control device 15, the flow control valve 16, the oxygen removal Component adjustment composed of a catalyst tower 20, a gas cooler 21, a dehumidifier 22, an odor device 23, a calorific value adjustment device 30, a flow meter 31, a flow rate control device 32, a flow rate adjustment valve 33, an oxygen meter 40 and an analyzer 41. Although an example of the means has been described, the present invention is not necessarily limited thereto, and various forms of component adjustment means can be used.

また、本実施の形態においては、都市ガス導管２８への注入量調整手段を配管２９の途中経路に備えた構成とし、予め求めた中圧ガスホルダー３の圧力と都市ガス導管２８へ注入可能な成分調整ガスの流量との関係を用いて成分調整ガスの流量を増減させる例について説明したが、必ずしもこれに限定されるものではなく、例えば、都市ガス導管２８への注入量調整手段を配管７０の途中経路に備えた構成とし、予め求めた中圧ガスホルダー３の圧力と都市ガス導管２８へ注入可能な成分調整ガスの流量との関係から、さらに、中圧ガスホルダー３の圧力と成分調整前の精製ガスの流量との関係を求め、成分調整前の精製ガスの流量を増減させることによって成分調整ガスの都市ガス導管２８への注入量を増減させることも可能である。 In the present embodiment, the means for adjusting the amount of injection into the city gas conduit 28 is provided in the middle path of the pipe 29 so that the pressure of the intermediate pressure gas holder 3 determined in advance and the gas can be injected into the city gas conduit 28. The example in which the flow rate of the component adjustment gas is increased or decreased using the relationship with the flow rate of the component adjustment gas has been described, but the present invention is not necessarily limited thereto. In addition, the pressure of the intermediate pressure gas holder 3 and the component adjustment are further determined from the relationship between the previously determined pressure of the intermediate pressure gas holder 3 and the flow rate of the component adjustment gas that can be injected into the city gas conduit 28. It is also possible to increase or decrease the injection amount of the component adjustment gas into the city gas conduit 28 by obtaining the relationship with the flow rate of the previous purified gas and increasing or decreasing the flow rate of the purified gas before component adjustment.

また、本実施の形態においては、所定の利用設備等として、ＣＮＧ車へ所定ガスを供給するためのガス充填設備を例に説明したが、必ずしもこれに限定されるものではなく、バイオガス利用システムにおける様々な所定の利用設備を用いることが可能である。このバイオガス利用システム内の様々な所定の利用設備等で利用される精製ガスの増減する所定流量と所定の最低圧力を確保するために、本願発明の技術思想を適用することができる。 In the present embodiment, the gas filling facility for supplying the predetermined gas to the CNG vehicle has been described as an example of the predetermined utilization facility. However, the present invention is not necessarily limited thereto, and the biogas utilization system is not necessarily limited thereto. It is possible to use various predetermined utilization facilities in The technical idea of the present invention can be applied to secure a predetermined flow rate and a predetermined minimum pressure of purified gas used in various predetermined utilization facilities in the biogas utilization system.

１消化タンク
２バイオガス精製装置
３中圧ガスホルダー
４圧力計
５付臭装置
６減圧弁
７加温用ボイラー
１０二酸化炭素除去器
１１流量計
１２酸素計
１３水電解式高純度水素酸素発生装置
１４流量計
１５流量制御装置
１６流量調整弁
２０酸素除去触媒塔
２１ガス冷却器
２２除湿器
２３付臭装置
２４流量計
２５流量調整弁
２６遮断弁
２７減圧弁
２８都市ガス導管
２９、７０、７５、８０、８５配管
３０熱量調整装置
３１流量計
３２流量制御装置
３３流量調整弁
４０酸素計
４１分析計
６０流量制御装置 DESCRIPTION OF SYMBOLS 1 Digestion tank 2 Biogas refiner 3 Medium pressure gas holder 4 Pressure gauge 5 Odor device 6 Pressure reducing valve 7 Heating boiler 10 Carbon dioxide remover 11 Flow meter 12 Oxygen meter 13 Water electrolysis type high purity hydrogen oxygen generator 14 Flow meter 15 Flow control device 16 Flow control valve 20 Oxygen removal catalyst tower 21 Gas cooler 22 Dehumidifier 23 Odor device 24 Flow meter 25 Flow control valve 26 Shut-off valve 27 Pressure reducing valve 28 City gas conduits 29, 70, 75, 80 85 Piping 30 Calorific value adjustment device 31 Flow meter 32 Flow rate control device 33 Flow rate adjustment valve 40 Oxygen meter 41 Analyzer 60 Flow rate control device

Claims

A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. A method for controlling the amount of injection into a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; Further comprising
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A step of determining in advance a relationship with an injection amount that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the storage determined in (1) Injection that increases or decreases the injection amount of the component adjustment gas into the city gas conduit by the injection amount adjusting means based on the relationship between the pressure of the purified gas and the injection amount of the component adjustment gas that can be injected into the city gas conduit A quantity control process;
A method for controlling the injection amount of the component adjustment gas into the city gas conduit in the biogas utilization system.

A biogas purification device for separating at least sulfur impurities from biogas and purifying high-concentration methane gas, an intermediate-pressure gas holder for storing purified gas obtained by this biogas purification device, and this intermediate pressure Predetermined equipment for supplying and using purified gas stored in the gas holder, and component adjusting means for adjusting the purified gas stored in the medium pressure gas holder to a predetermined composition and concentration required by city gas And a pipe for guiding a gas adjusted to a predetermined composition and concentration by the component adjusting means (hereinafter referred to as “component adjusting gas”) to a city gas conduit. An injection amount control device for a city gas conduit,
A pressure gauge for measuring the pressure of the refined gas stored in the intermediate pressure gas holder (hereinafter referred to as “stored refined gas”), and an injection amount adjusting means in the middle of the pipe or in the component adjusting means; With
(1) In order to ensure a predetermined flow rate and a predetermined minimum pressure of the purified gas used in the predetermined utilization facility, the pressure of the stored purified gas measured by the pressure gauge and the component adjustment gas A storage unit storing data obtained in advance for the relationship with the amount of injection that can be injected into the city gas conduit;
(2) When supplying the purified gas to the predetermined utilization facility, the pressure of the stored purified gas is measured with the pressure gauge, and the measured pressure and the data stored in the storage unit From the relationship, an injection amount calculation unit for calculating the injection amount that can be injected into the city gas conduit of the component adjustment gas by the injection amount adjustment means,
A device for controlling the amount of component-adjusted gas injected into a city gas conduit in a biogas utilization system.