JP2011117481A - Method and device of filling control in high pressure hydrogen test equipment and high pressure hydrogen filling equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of filling control in high pressure hydrogen test equipment and high pressure hydrogen filling equipment capable of applying pressure at a constant pressure rising rate without an excessive rise in temperature of an object to be tested, with a simple structure. <P>SOLUTION: A high pressure compressor 1, a cooling part 2, the object to be tested 3, and a high pressure buffer tank 4 are connected by a gas supply passage 5 to form a closed circuit. A discharge port 1a and a suction port 1b of the high pressure compressor 1 are connected by a bypass passage 8 with a pressure adjusting valve 7 interposed therein. A flow passage opening/closing valve 9 is arranged on a downstream side relative to a bypass passage branch part 8a on the discharge side of the high pressure compressor 1. A pressure adjusting valve 10 is arranged on an upstream side relative to an inflow port to the object to be tested 3. The opening of the pressure adjusting valve 10 is controlled so as to make the pressure rising rate constant. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a test facility for grasping durability associated with a pressure change of equipment and piping constituting a high-pressure hydrogen use facility, a filling control method in a facility for filling high-pressure hydrogen, and an apparatus therefor.

  Conventionally, in order to inspect the durability accompanying the pressure change of the components that make up the equipment that uses high-pressure gas, a so-called impulse test that checks the durability by repeatedly changing the pressure from the atmospheric pressure to the set pressure has been imposed. . In this case, pressure is generally applied by an incompressible fluid such as oil.

  When a high-pressure hose for high-pressure gas equipment is used as a test specimen, not only an impulse test using an incompressible fluid but also a test using an actually used gas is desirable to evaluate the effect. If pressure is applied rapidly by opening and closing, the temperature rises inside the specimen due to adiabatic compression, so it is not possible to accurately assess which pressure cycle or temperature cycle affects the durability of the high-pressure hose. There is a problem. For this reason, it is required to apply pressure at a constant pressure increase rate so that the temperature of the specimen does not rise excessively.

  Also in hydrogen filling equipment for fuel cell vehicles, etc., filling at a constant pressure increase rate has been proposed in order to prevent the temperature rise of the vehicle-mounted container. As a method of filling at this constant pressure increase rate, for example, a patent As shown in Document 1, a method has been proposed in which a filling flow rate at which a constant pressure increase rate is obtained is calculated from the internal volume of a filling object (on-vehicle container) and the flow rate is controlled.

  In addition, a method of setting a target filling flow rate within the next fixed time from the filling flow rate within a fixed time and the pressure increase width during that time without knowing the internal volume of the filling object has also been proposed.

JP 2005-98474 A

  However, in any of the above-mentioned methods, it is necessary to measure the flow rate during filling with a flow meter, and there is a problem that the installation of a flow meter for high-pressure hydrogen increases the cost of test equipment. There is a problem that a flow meter cannot be used in a higher pressure test that cannot be handled by a flow meter.

  If the internal volume of the specimen is always constant, the filling flow rate may be determined from the internal volume, but if the internal volume of the specimen is not specified, the filling flow rate should be set from the internal volume each time. There is also a problem that the work becomes complicated.

  Although the present invention has been made paying attention to such points, a high-pressure hydrogen test that can apply pressure at a constant pressure increase rate with a simple configuration without excessively increasing the temperature of the specimen. It aims at providing the filling control method in an installation or a high-pressure hydrogen filling installation.

  In order to achieve the above-mentioned object, the present invention according to claim 1 is provided with a cooling unit and a pressure regulating valve in a high-pressure hydrogen supply passage for charging and supplying a test body when charging high-pressure hydrogen into a high-pressure hydrogen test facility. By interposing and adjusting the opening of the pressure regulating valve, the test body is characterized in that a constant pressure increase rate is set so as not to be thermally affected by the temperature rise.

  The present invention according to claim 3 forms a closed circuit by connecting an apparatus for charging high-pressure hydrogen to a high-pressure hydrogen test facility with a high-pressure compressor, a cooling unit, a test body, and a high-pressure buffer tank through a gas supply path, The discharge port and suction port of the high-pressure compressor are connected by a bypass passage with a pressure control valve, and a flow path opening / closing valve is placed downstream of the bypass passage branch on the discharge side of the high-pressure compressor. A pressure regulating valve is arranged upstream of the inlet to the body, and the opening degree of the pressure regulating valve is controlled so that the pressure increase rate is constant.

  Further, according to the fifth aspect of the present invention, when the high-pressure hydrogen filling facility is filled with high-pressure hydrogen, a pressure regulating valve is interposed in the supply path of the high-pressure hydrogen gas filled and supplied to the filling container, and the pressure regulating valve is opened. By adjusting the degree, the filling container is set to have a pressurization rate that is not affected by the thermal rise of the temperature rise.

  Furthermore, the present invention as set forth in claim 7 forms a gas filling circuit by connecting a high-pressure hydrogen storage tank, a high-pressure compressor, and a filling container with a gas supply path, and has a discharge port and a suction port of the high-pressure compressor. Connected by a bypass line with a pressure regulating valve, a flow path opening / closing valve is arranged downstream of the bypass line branch on the discharge side of the high-pressure compressor, and the pressure is upstream of the inlet to the specimen. An adjustment valve is disposed, and the opening degree of the pressure adjustment valve is controlled so as to keep the pressure increase rate constant.

  In the present invention, the filling of the test specimen or the filling container is started, and thereafter, the opening degree of the pressure regulating valve is directly controlled based on the pressure increase width in a predetermined time (for example, 1 second), and a constant pressure increasing rate is obtained. The pressure can be adjusted so that even if the internal volume of the specimen or filling container changes, high-pressure hydrogen can be filled at a constant pressure increase rate without using an expensive flow meter. .

It is a figure which shows the general | schematic flow of an impulse test equipment. It is a figure which shows the relationship between the pressure and time in an impulse test. It is a pressure change figure which shows an example of filling control of hydrogen gas. It is a figure which shows the schematic flow of a hydrogen filling equipment.

FIG. 1 is a configuration diagram showing an outline of a test facility for performing an impulse test by using high-pressure hydrogen by using containers, piping, and fittings as test bodies.
In this test facility, a high-pressure compressor (1), a cooling section (2), a test body (3), and a high-pressure buffer tank (4) are connected by a gas supply path (5), respectively, to form a closed circuit. Bypass passage (7) between the outlet (6a) of the cooler (6) arranged at the discharge port (1a) of the machine (1) and the suction port (1b) of the high-pressure compressor (1) 8), and the flow path opening / closing valve (9) is arranged in the gas supply path (5) located downstream of the bypass path branching section (8a) on the outlet (6a) side of the cooler (6). is there.

  The gas supply path (5) between the cooling part (2) and the test body (3) is provided with a pressure regulating valve (10), and this pressure regulating valve (10) is a control device (11). The opening degree is adjusted by a control signal from. The temperature and pressure detected at the inlet (3a) of the specimen (3) and the temperature detected at the outlet (3b) of the specimen (3) are input to the control device (11) as detection data. ing.

  The gas supply path (5) between the test body (3) and the high-pressure buffer tank (4) includes a flow path opening / closing valve (12), and a suction port (1) for the high-pressure buffer tank (4) and the high-pressure compressor (1). The gas supply path (5) between 1b) is provided with a flow path opening / closing valve (13) and a pressure regulating valve (14), respectively.

  Next, a procedure for performing an impulse test using the test equipment having the above-described configuration will be described. With a test body (for example, a high pressure hose) (3) connected to the gas supply path (5), the flow path opening / closing valve (13) between the test body (3) and the high pressure buffer tank (4) is closed. The flow path opening / closing valve (9) disposed between the high pressure compressor (1) and the cooling section (2) is opened, and the high pressure hydrogen gas pressurized by the high pressure compressor (1) is cooled by the cooling section. In this state, it is supplied to the test body (3). At this time, the hydrogen gas pressurized to a pressure of about 90 MPa by the high pressure compressor (1) is cooled to about 40 ° C. by the cooler (6) disposed at the discharge port (1a) of the high pressure compressor (1). Further, heat is exchanged with a refrigerant such as liquid nitrogen in the cooling section (2), the temperature is cooled to about 233 K (−40 ° C.), and the specimen (3) is supplied.

  In the test body (3), when high-pressure hydrogen gas flows in rapidly, the temperature rises due to adiabatic compression, so that the temperature of the test body (3) does not rise excessively, so that the pressure increase rate is constant. Then, the opening of the pressure regulating valve (10) is adjusted and filled with high-pressure hydrogen gas. When the internal pressure of the test body (3) reaches a predetermined pressure (for example, 70 MPa), the flow path opening / closing valve (9) disposed between the high pressure compressor (1) and the cooling unit (2) is closed. At the same time, by opening the flow path opening / closing valve (13) between the test body (3) and the high pressure buffer tank (4), the test body (3) and the high pressure buffer tank (4) are communicated with each other, By transferring the high-pressure hydrogen gas in the test body (3) into the high-pressure buffer tank (4), the test body (3) is depressurized to about atmospheric pressure. The total time required for one cycle of this gas filling-gas depressurization is about 5 minutes. In the impulse test, this gas filling-gas depressurization cycle is repeated several thousand times continuously at a short pitch as shown in FIG.

  The high-pressure buffer tank (4) and the high-pressure compressor (1) are basically always in communication with each other via the pressure regulating valve (14). Further, the high pressure compressor (1) is always rotating, and when the flow path opening / closing valve (9) disposed between the high pressure compressor (1) and the cooling section (2) is closed, a bypass passage is provided. It is configured to circulate through (8). The pressure regulating valve (7) disposed in the bypass path (8) and the pressure regulating valve (14) disposed in the gas supply path (5) between the high pressure buffer tank (4) and the high pressure compressor (1) are: In either case, the secondary pressure is set to a pressure of about 0.7 to 0.8 MPa.

  The flow rate of the high-pressure hydrogen gas supplied to the test body (3) is performed by controlling the opening degree of the pressure regulating valve (10). This high-pressure hydrogen gas flow rate control is performed from the thermometer (15a) (15b) placed at the entrance and exit of the test body (3) and the pressure gauge (16) that detects the pressure of the test body (3) to the control device (11). The pressure increase rate is calculated from the input temperature and pressure, and the opening of the pressure control valve (10) is controlled so that the pressure increase per hour that changes every moment matches the preset pressure increase rate. It is.

  In this embodiment, the preset step-up rate refers to a step-up rate that is not thermally affected by temperature rise. For example, in the case of hydrogen gas, the step-up rate is in the range of 17 to 18 MPa / min.

  When the impulse test is performed in this way, the high-pressure hydrogen gas supplied to the specimen is cooled, thereby reducing the temperature rise of the filling object (test specimen) and suppressing the influence of the temperature rise on the detection result. I can do it.

  In addition, hydrogen gas filled in the test body (3) is collected in the high-pressure buffer tank (4) and returned to the compressor suction line, so that hydrogen gas is not released into the atmosphere and the test cost can be reduced. become. Further, the recovery enables the hydrogen depressurization in the test body to be performed in a short time, and the impulse test in which the entire gas filling-gas depressurization cycle is repeated at a short time pitch becomes easy.

  In addition, by arranging a pressure regulating valve (7) in the discharge line of the high-pressure compressor that is always in operation, surplus hydrogen is released to the atmosphere during the depressurization process in which no pressure is applied to the specimen (3) in the impulse test. It can be recovered to the suction side of the high-pressure compressor without any waste, and the waste of test hydrogen can be eliminated.

FIG. 4 is a configuration diagram showing an outline of equipment for charging high-pressure hydrogen.
In this high-pressure hydrogen filling facility, the hydrogen supply source (17) is connected to the suction port (1b) of the high-pressure compressor (1) through the pressure regulating valve (14) and the discharge port of the high-pressure compressor (1). (1a) is connected to the filling container (18) through a cooler (6), a flow path opening / closing valve (9), and a pressure regulating valve (10), and the cooler (6) and the flow path opening / closing valve (9 ) Is connected to the suction port (1b) of the high-pressure compressor (1) through the pressure regulating valve (7).

  As the hydrogen supply source (17), a tank for storing high-pressure hydrogen, a hydrogen generator for generating hydrogen by reforming natural gas, LPG, kerosene, or the like is used.

  Although not shown in the drawings, in the present embodiment, the gas supply path (5) between the flow path opening / closing valve (9) and the pressure adjustment (10) is supplied from a cooling unit for cooling hydrogen gas or a high pressure compressor (1). You may provide the high pressure buffer tank which stores the high pressure hydrogen discharged via a cooler (6) individually or both, respectively.

  In this embodiment as well, as in the above-described embodiment, the opening degree of the pressure regulating valve (10) is controlled so that the increase in internal pressure in the filling container (18) matches the preset pressure increase rate. It is. The pressurization rate varies depending on the internal volume of the filling container and the initial temperature and initial pressure of the gas in the filling container. For example, in the case of hydrogen gas, the pressurization rate is in the range of 1 to 30 MPa / min.

  INDUSTRIAL APPLICABILITY The present invention can be used for hydrogen filling in a hydrogen gas filling facility or a test facility that uses an actual gas used in equipment or piping constituting a high-pressure hydrogen facility.

  DESCRIPTION OF SYMBOLS 1 ... High pressure compressor (1a ... Discharge port, 1b ... Suction port) 2 ... Cooling part, 3 ... Test body (3a ... Inlet), 4 ... High pressure buffer tank, 5 ... Gas supply path, 7 ... Pressure control valve , 8 ... Bypass passage (8a ... Bypass passage branching portion), 9 ... Flow path opening / closing valve, 10 ... Pressure regulating valve, 17 ... Hydrogen supply source, 18 ... Filling container.

Claims (8)

  When charging high-pressure hydrogen into the high-pressure hydrogen test facility, a cooling part (2) and a pressure regulating valve (10) are interposed in the high-pressure hydrogen supply passage (5) for filling and supplying the test body (3). A filling control method in a high-pressure hydrogen test facility, characterized in that, by adjusting the opening degree of (10), the pressure increase rate is set so that the test body (3) is not thermally affected by the temperature rise.   The filling control method in the high-pressure hydrogen test facility according to claim 1, wherein the constant pressure increase rate not affected by the thermal rise of the temperature is 17 to 18 MPa / min.   The high pressure compressor (1), the cooling section (2), the test body (3), and the high pressure buffer tank (4) are connected by a gas supply path (5) to form a closed circuit, and the discharge of the high pressure compressor (1) The outlet (1a) and the suction port (1b) are connected by a bypass passage (8) with a pressure regulating valve (7) interposed, and from the bypass passage branch (8a) on the discharge side of the high-pressure compressor (1) In addition, a flow path opening / closing valve (9) is disposed on the downstream side, a pressure regulating valve (10) is disposed on the upstream side of the inlet (3a) to the test body (3), and the pressure regulating valve (10) A filling control apparatus in a high-pressure hydrogen test facility, characterized in that the opening degree is controlled so that the pressurization rate is constant.   The filling control apparatus for a high-pressure hydrogen test facility according to claim 3, wherein the pressure increase rate in the test body (3) is 17 to 18 MPa / min.   When filling high-pressure hydrogen in the high-pressure hydrogen filling facility, a pressure regulating valve (10) is interposed in the high pressure hydrogen supply path (5) for filling and supplying the filling container (18), and the opening of the pressure regulating valve (10) The filling control method in the high-pressure hydrogen filling facility is characterized in that the pressure is increased so that the filling container (18) is not affected by the temperature rise by adjusting the pressure.   The filling control method in the high-pressure hydrogen filling equipment according to claim 5, wherein the pressure increase rate not affected by the thermal rise of the temperature is 1 to 30 MPa / min.   A hydrogen supply source (17), a high pressure compressor (1), and a filling container (18) are connected by a gas supply path (5) to form a gas filling circuit, and a discharge port (1a) of the high pressure compressor (1) The suction port (1b) is connected by a bypass passage (8) with a pressure regulating valve (7) interposed, and flows downstream from the bypass passage branch (8a) on the discharge side of the high-pressure compressor (1). A road opening / closing valve (9) is arranged, a pressure regulating valve (10) is arranged upstream of the inlet to the filling container (18), and the opening rate of the pressure regulating valve (10) is set to be constant. A filling control apparatus in a high-pressure hydrogen filling facility, wherein the filling control apparatus is configured so as to be controlled. 4. The filling control apparatus for a high-pressure hydrogen test facility according to claim 3, wherein the pressurization rate in the filling container (18) is 1 to 30 MPa / min.

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