US 2026/0251301 A1Published application

Plant and method for operating plant

AssigneeMitsubishi Heavy Industries, Ltd.

InventorsRei IKEDA, Satoko FUJII, Masahiko NAKAHARA, Takashi SHIRAIWA, Takefumi TAKAHASHI, Shinya UCHIDA, Atsuhiko KANEBAKO, Shinichi YAMAZAKI, Mitsuhiro MORISHITA

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Abstract

A plant including: second gas piping connected to first gas piping for guiding first combustible gas from a first supply source to a gas-using device; two gas cutoff valves positioned in the second gas piping; vent piping connected to a position on the second gas piping between the two gas cutoff valves; a vent valve positioned in the vent piping; and a pressure gauge that reports the pressure within vent pressure control piping in the vent piping. When the two gas cutoff valves are closed, the vent valve operates so that the pressure within the vent pressure control piping is less than the supply pressure of the first combustible gas supplied by the first supply source to the first gas piping and the supply pressure of a second combustible gas supplied by a second supply source to the second gas piping, and is greater than atmospheric pressure.

Claims9

Dependent claims

A plant comprising:

a first gas pipe that is connected to a first supply source and a gas utilization device and that is configured to guide a first combustible gas from the first supply source to the gas utilization device;
a second gas pipe that is connected to a second supply source and the first gas pipe and that is configured to guide a second combustible gas from the second supply source to the gas utilization device through the first gas pipe;
a first gas shut-off valve that is disposed in the second gas pipe and that is configured to perform an opening and closing operation;
a second gas shut-off valve that is disposed on a second supply source side with the first gas shut-off valve as a reference in the second gas pipe and that is configured to perform an opening and closing operation;
a vent pipe that has a first end and a second end, in which the first end is connected to a position of the second gas pipe between the first gas shut-off valve and the second gas shut-off valve, and the second end is open to an atmosphere;
a vent valve that is disposed in the vent pipe and that is configured to perform an opening and closing operation;
and
a pressure gauge that is configured to detect a pressure in a vent pressure control pipe, which is a pipe portion that includes a portion of the vent pipe on a second gas pipe side of the vent valve and a portion of the second gas pipe between the first gas shut-off valve and the second gas shut-off valve,
wherein, when the first gas shut-off valve and the second gas shut-off valve are in a closed state, the vent valve is configured to operate such that a pressure in the vent pressure control pipe is lower than a first supply pressure, which is a supply pressure of the first combustible gas supplied to the first gas pipe by the first supply source, and a second supply pressure, which is a supply pressure of the second combustible gas supplied to the second gas pipe by the second supply source, and higher than an atmospheric pressure, according to the pressure in the vent pressure control pipe detected by the pressure gauge.

6 more elements

A method for operating a plant including

a first gas pipe that is connected to a first supply source and a gas utilization device and that is configured to guide a first combustible gas from the first supply source to the gas utilization device,
a second gas pipe that is connected to a second supply source and the first gas pipe and that is configured to guide a second combustible gas from the second supply source to the gas utilization device through the first gas pipe,
a first gas shut-off valve that is disposed in the second gas pipe and that is configured to perform an opening and closing operation,
a second gas shut-off valve that is disposed on a second supply source side with the first gas shut-off valve as a reference in the second gas pipe and that is configured to perform an opening and closing operation,
a vent pipe that has a first end and a second end, in which the first end is connected to a position of the second gas pipe between the first gas shut-off valve and the second gas shut-off valve, and the second end is open to an atmosphere, and
a vent valve that is disposed in the vent pipe and that is configured to perform an opening and closing operation, the method comprising:
a pressure detection step of detecting a pressure in a vent pressure control pipe, which is a pipe portion that includes a portion of the vent pipe on a second gas pipe side of the vent valve and a portion of the second gas pipe between the first gas shut-off valve and the second gas shut-off valve;
and
a pressure control step of, when the first gas shut-off valve and the second gas shut-off valve are in a closed state, operating the vent valve such that a pressure in the vent pressure control pipe is lower than a first supply pressure, which is a supply pressure of the first combustible gas supplied to the first gas pipe by the first supply source, and a second supply pressure, which is a supply pressure of the second combustible gas supplied to the second gas pipe by the second supply source, and higher than an atmospheric pressure, according to the pressure in the vent pressure control pipe detected in the pressure detection step.

6 more elements

Dependencies are inferred from the claim text.