Fossil fuels refer to coal, oil, natural gas and other non-renewable fuel resources buried under the ground and in the ocean. The fossil fuels are classified into coal, oil, oil shale, natural gas, oil sands, and flammable ice under the sea in the order of the amount of buried energy.
Fossil fuel coal is a plant buried in the ground that is affected by underground and geothermal heat. After tens of millions of years or even hundreds of millions of years of carbonization, the water, carbon dioxide, methane and other gases are released, and the oxygen content is reduced. The amount of charcoal is very rich. Due to different geological conditions and degrees of evolution, the amount of carbon is different, so the calorific value is different. It is divided into anthracite, bituminous coal and lignite according to the order of calorific value. Coal is widely distributed on the earth and does not concentrate on a certain place of origin.
Petroleum is a microbial residue accumulated in water, a hydrocarbon formed under the action of high pressure. After the oil is refined, it can be obtained from gasoline, kerosene, diesel and heavy oil. Oil is unevenly distributed on the planet, with 54% in the Middle East, 12% in North America, and 9% in South America, accounting for almost three-quarters of the identifiable burial.
Oil shale is formed after carbonization of algae, and contains too much ash, most of which cannot be self-ene. Oil sands are sands containing 4 to 20% of heavy oil. Oil shale and oil sands are more common in the American continent.
Natural gas is directly mined underground and contains methane. It is cooled at 162 degrees Celsius and liquefied and transported as a large dedicated sea vessel or tank for LNG. The distribution of natural gas is also very biased in the Middle East, the Americas and the European continent.
Combustible ice is a recently discovered flammable substance that exists in the form of a solid form of methane that is stored in the deep ocean.
Door Accessories
Door accessories include Automatic Door Kits , High Speed Door Motor And Control Box, High Speed Door Accessories, Other Door Accessories. We can sell any parts of these accessories.
Automatic door kits: Our automatic door kits include 1 motor+gear reducer, 1 belt,7 meter, 1 idle pulley, Microprocessor, 4 sets of carriage blue wheels, 2 sets of floor guides,2pcs remote control, 2 sets belt clamp mounting brackets, 1 power supply harness and cable connectors, 2 locator, Aluminum track whose length is 2.08 meter, 3 meter, or 4 meter. We are a manufacturer of automatic door openers that are designed to provide people convenience. Automatic Door Systems` drive to provide that level of service is but one of the reasons why automatic doors are becoming more and more popular. Our Automatic Sliding Door systems are modern, space-saving and elegant. Automatic sliding doors have many basic functions some of which include: automatic mode with full opening width and/or reduced opening width, and exit only for traffic control. The opening of automatic doors can also be adjustable to make the opening width smaller or larger. Important safety functions such as safety sensors prevent the door from shutting if persons or objects are in the detection zone. If the door leaves are inhibited when closing, they are immediately re-opened or if the door leaves are hindered when opening, they are immediately stopped by a safety automatic reversing mechanism.
High Speed Door motor and control box: Our company have German SEW Motor, Japan Mitsubishi Controller. Our own brand Hofic servo motor and controller. Chinese famous brand SEJ motor and Holip controller. German SEW Motor and Japan Mitsubishi Controller: It is easy to find the ideal energy-efficient motor for your application at SEW. Our rolling gate servo control system is suitable for high speed and high usage soft and hard rolling gate. The whole system is in a small and light package, it has high torque and high operating speed, lower noise, high reliability, smooth and soft operating curves, it`s suitable for high speed and usage environment. SEJ motor and Holip controller: Three-phase asynchronous motor with magnetic brake has broad uses, It is suitable for various mechanical main drive and auxiliary drive, and it is also used for various required rapid stopping and correct positioning.
high speed door accessories: Driving system: High speed door Servo System motor and control, motor SNMA / SEJ +reducer+flang+encoder+control box. Other accessories: Middle aluminium bar, bottom aluminium bar, aluminium vertical track, stainless steel vertical track, brushes,round nylon strip, PVC roll, rolling steel tube complete, drum be;;s for rolling tube, side end covers, stainless steel cover, steel tubes, air bag sensor system, safety light beam, Microwave sensor 24 Gigahertz,PVC welding machine, smoke and fire sensors, PVC transparent window, magnetic loop, photocell, remote control, manual push button, sound warning alarm Led lamp traffic light.
Other door accessories: Sectional door accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
For accessories detail information, please kindly check our detail classify.
Door Accessories,Automatic Door Kits,High Speed Door Accessories,Sliding Door Operator
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfautodoors.com