There are three types of flameout protection devices.
1、Thermal-sensitive type: also known as bimetal. The bimetallic strip is used as the sensor of the safety protection device, and the expansion and bending characteristics of the bimetallic strip under the action of temperature are utilized. The device has the advantages of simple structure, low cost. Disadvantages are difficult installation, long starting and shut down time and short service life.
2、Thermoelectric type: Thermoelectric flameout safety protection device is composed of thermocouple and solenoid valve, which uses different thermoelectric potentials generated by different alloy materials under the action of temperature. Thermoelectric safety device has simple structure, convenient installation, low cost and wide application.
3、Photoelectric type: Also known as ion induction type, this device makes use of the ionicity and unilateral conductivity of the flame during gas combustion. This kind of safety protection has developed from DC induction to AC induction.
(1) The unstable gas source causes flame fluctuation. Try adjust the pressure and restart.
(2) When the flame detector fails to run, the flame detection probe is grounded, or when it is too dirty, the normal flame cannot be detected and flameout occurs. Try adjust the probe position, clean the probe surface and restart.
Possible reasons: (The following reasons refer to what happens when the burner is used in the positive pressure furnace of the boiler)
a. It may be that the internal pressure of the furnace itself is too high.
b. It may also be that the diameter of the smoke exhaust pipe is too small or there are too many turns. At the same time, please check whether the smoke exhaust passage is blocked. If a chimney baffle is installed, please pay attention to whether it has been opened. If the resistance in the furnace is too high, it will make a vibration noise when it catches fire. In addition, if the pressure of gas is too high, it will make a special noise when it catches fire.
The structure of scroll vacuum pump is simple, mainly composed of five parts: (1) dynamic scroll disc and base; (2) the crankshaft; ③ seals; (4) anti-rotation mechanism; Motor vortex vacuum pump structure.
The main moving parts of scroll vacuum pump are only moving scroll, simple power transfer, small radius of motion under the same size, so it has the characteristics of simple and compact structure, smooth operation, almost no wear, small power consumption, which is not available in other types of dry vacuum pump.
2.the scope of application
Scroll vacuum pump pumping speed is small, and is not suitable for toxic, flammable and explosive gases, corrosive gases and drugs, solvents, powder and other medium conditions. Therefore, vortex vacuum pump is more used in analytical instruments, semiconductor chip production line, LIQUID crystal display production line and scientific research equipment. Because it can be started directly at atmospheric pressure, it is often used as a precursor of molecular pumps and small cryogenic pumps.
Asphalt smoke is characterized by easy adhesion, easy to ignite above a certain temperature. In the process of the collection, transportation and smoke elimination of asphalt smoke, it is easy to stick to the surface of pipelines and equipment to form liquid to solid asphalt. After consolidation, asphalt is difficult to remove, often resulting in pipeline blockage, equipment damage, so that the system can not run normally.
In addition, the components of bitumen flue gas are very complex and vary with the source of bitumen. There are not only solid and liquid particles condensed from volatile components of asphalt, but also organic matter in vapor state. Some organic matter is polymer polymer, which will cause serious pollution to the environment. Flue gas contains a variety of organic compounds, including carbon cyclic hydrocarbons, cyclic hydrocarbon derivatives and other compounds, many of which are harmful to human health. Asphalt smoke contains benzo pyrene, benzanthracene, carbazole and other polycyclic aromatic hydrocarbons, and most of them are carcinogenic and strong carcinogens, the main way of harm to human health is attached to the dust below 8 um, through the respiratory tract is inhaled into the body. Therefore, it is very necessary to purify the asphalt fume and make the emission meet the standard of atmospheric environment.
Based on the experience of optimization and integration of combustion technology resources in Europe, we have achieved a safe, energy-saving and environmentally friendly burner that can be adapted to all thermal equipment.