A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

Systems, apparatuses, and methods for making content liquid foamy for discharge are described herein. A dispenser for making content liquid discharge foamy by mixing air flow from an air chamber with the content liquid flow from a liquid chamber can be provided. The dispenser can include a mixing chamber configured to mix air and content liquid; a porous member between an air passage from the air chamber and the mixing chamber; and a liquid passage from the liquid chamber to the mixing chamber. The liquid passage can have a first liquid passage and a plurality of second liquid passages. The liquid passage can be configured such that content liquid flows from the first liquid passage to the second liquid passages to the mixing chamber. The second liquid passages can be configured to provide flow of the content liquid in at least two directions.

A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

The present invention provides a foam supply device in which water is not stirred in a chassis and therefore, resistance in the water pipe can be reduced, and foam can stably be radiated without deteriorating momentum of radiation.

The foam supply device includes a water supply port 11, a water pipe 13 for introducing water from the water supply port 11, a drug supply pipe 14, a drug supply section 15, a gas supply pipe 17, a gas mixing section 19, a stirring section 60, a water pipe discharge port 12 and a radiation pipe 40. The water supply port 11 and the water pipe discharge port 12 are provided in the chassis 10. The water pipe 13, the drug supply pipe 14 and the drug supply section 15 are placed in the chassis 10. The stirring section 60 is placed downstream from the water pipe discharge port 12. Water which is not stirred by a stirring section 60 flows through the water pipe 13 placed in the chassis 10.

Embodiments described herein relate to firefighting foam generators. The generators may include a receptacle for receiving liquid. A gas supply may be provided for supplying gas into the liquid to create foam. At least one turbulence creator may be provided for creating turbulence in the receptacle. Advantageously, the firefighting foam generators create turbulence to assist with mixing the gas and liquid when creating the foam. The embodiments provide for improved mixing and evenness of foam, without foam flooding, when compared with known foam generators. The embodiments are also simple to manufacture when compared with known foam generators.

A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

Various embodiments herein pertain to apparatus and methods that utilize the water and existing chemicals to generate a foam. The foam can be introduced at that gas-path entrance of the equipment, where it contacts the stages and internal surfaces, to contact, scrub, carry, and remove fouling away from equipment to restore performance. Some embodiments include mixing gas with liquid to create a supply of foam, streaming the foam into a gas turbine engine installed on an airplane, rotating the spools of the engine while streaming, and re-rotating the spools of the engine after a spool has stopped. In yet other embodiments there is a method that includes streaming the foam into an engine installed on an airplane, quantifying an improvement to a family of engines achievable by foam washing, operating a specific engine, determining that the specific engine should be washed, and scheduling a foam washing of the specific engine.

Systems, apparatuses, and methods for making content liquid foamy for discharge are described herein. A dispenser for making content liquid discharge foamy by mixing air flow from an air chamber with the content liquid flow from a liquid chamber can be provided. The dispenser can comprise a mixing chamber configured to mix air and content liquid; a porous member between an air passage from the air chamber and the mixing chamber; and a liquid passage from the liquid chamber to the mixing chamber. The liquid passage can have a first liquid passage and a plurality of second liquid passages. The liquid passage can be configured such that content liquid flows from the first liquid passage to the second liquid passages to the mixing chamber. The second liquid passages can be configured to provide flow of the content liquid in at least two directions.

The present invention is a mixing device for producing compressed foam for an extinguishing device for firefighting comprising a foam solution inlet that is operatively connected to a foam solution mixture area that is operatively connected to a compressed air inlet that is operatively connected to a compressed air injection manifold that is operatively connected to a mixing chamber. The compressed air injection manifold having a plurality of lateral sides that have a plurality of holes distributed across at least one of the lateral sides. A scrubbing collector pipe that extends into the mixing chamber to form an annular flow area within the mixing chamber. The scrubbing collector pipe having a plurality of holes distributed around an outer periphery of the scrubbing collector pipe. An inner collector pipe within the scrubbing collector pipe. A compressed air foam outlet operatively connected to the scrubbing collector pipe.