Cylinders for motor transport
Set to run on liquefied natural gas "Helium-SAGA"
Set to run on liquefied natural gas "Helium-SAGA"
Implementing new technology solutions for liquefied natural gas methane (CNG) as motor fuel gives a significant economic effect due to the reduction of operating costs (ordinary "Gazelle" when filling the gas fuel rides of 200 km, as is commonly believed, and 450), as well as create an energy bridge in an environmentally prosperous society. The main feature of automotive systems for CNG - the presence of a vessel with high vacuum and thermal insulating properties for gas storage. Cooled to a temperature of -160 ° C methane becomes a liquid state even at atmospheric pressure and significantly reduced in volume. Scientific-production firm "SAGA" together with the NGO Geliymash "developed gas-fueled equipment for the storage and supply of CNG in motor vehicles" Gazel ". Layout AGTS "Helium-SAGA" car is shown in Fig. 21. The gas container 4 is provided with two brackets on the right longeron automobile transport frame behind the cab driver. Filling devices and measuring instruments installed in the cabinet reinforcement 5, posted on the vessel. The drain pipe 6 is intended to drain into the atmosphere vaporized gas, released from the safety valves located in reinforcing the closet, as well as for emergency relief for damage to gas valve. The drain pipe launched up over the tent body and is attached to the body clamps. Emergency discharge of gas from the vessel through a speed valve, also located in reinforcing the closet. The instrument panel 7, located in the cab, provides control of gas appliances and control its operation. In reinforcing the closet of the vessel, painted in red, white painted inscription: "Meta".
Receptacle 4 is a double cylindrical tank (Fig. 22) made of stainless steel. The inner vessel 2 is calculated on the excess pressure of working pressure of 0,5 MPa. To maintain the desired vacuum in the insulating space between the vessel 2 and the casing 1 and the thermal insulation outer surface of the inner vessel is covered with a highly absorbent material (vacuum-shirt 3), forming a layered insulation. The vessel is fixed in a housing with two cylindrical bearing bush 4 out of fiberglass. In the upper part of the cavity inner vessel installed trap 5, prevent the emission of gas in the liquid phase drainage pipe while driving on rough roads. At the bottom of the casing 1 is the vacuum valve 6, through which you can create and maintain long in the insulating vacuum space required. Capacity 100 liters of gas vessel. The vessel is filled with gas is not more than 90%. Store gas in the vessel provides roughly the same mileage as gasoline. The car can be operated in a radius of about 450 km from the gas-filling station. In the vessel the gas is stored without loss in three days - so-called without drainage storage. Heat flow from the atmosphere heats the vessel, and after about 72 hours the pressure in it may increase. This triggered the safety valves and vapor phase gas is released into the environment through the drainage pipe. Reset gas from the vessel to lower the pressure can also be a ball valve (see below) in the drainage pipe. When charging the level of LNG in the vessel to monitor the pressure gauge in reinforcing the closet, and when the motion - the sign of the gas level, which is in the driver's cab. Valve box (Fig. 23) is mounted directly on the vessel. It consists of two compartments: a filling and functional 4. Each compartment is equipped with self-opening lid with a lock. In refueling compartment on the special panel placed gauges 3 and filler 2. In filler combines two lines - filling and bleed. In functional compartment are safety valves, 7-speed valve 5, valve 6 switching phases and ball valves 8.
Safety valves set the working pressure of 0,5
MPa. With an increase in working pressure from 0,54 to 0,57 MPa, the valve
opens and resets the methane vapor in the drainage pipe. High-speed valve is
used to disable the vessel and stop the flow of gas in case of damage or
breakage of the main pipeline. The valve switching phase has two functions
depending on the value of the gas pressure in the vessel. At a pressure of up
to 0.4 MPa in the heat exchanger 2 (see Fig. 21) is fed the liquid phase, more
than 0,4 MPa - vapor phase. The heat exchanger is designed for the evaporation
of the liquid phase and heating the LNG to the engine. Piping systems are
manufactured from stainless steel with a flow area of 8 mm and have thin walls,
since the entire system operates under low pressure from 0,15 to 0,55 MPa. AGTS
"Helium-SAGA" works as follows. The gas in liquid form is fed by line
in the heat exchanger, where the heated liquid from the engine cooling system.
In the gaseous form of natural gas goes directly into the gas system of the
Saga-6. Next, a gas injection is carried out on the traditional circuit-reducer
vaporizer Saga-6, where the pressure is reduced to a value close to
atmospheric. Then, under the influence of dilution in the intake tract of an
engine fed into a mixer, which mixes with air passing through the air filter.
The formed gas mixture through the carburetor is directed into the inlet pipe
and into the engine cylinders.