Difference of Safety Valve for Steam, Hot Water and Gas heating Boiler
Difference of Safety Valve for Steam, Hot Water and Gas heating Boiler
The working temperature of the safety valve of hot water gas heating boiler is low. Steam gas heating boiler has high pressure and high temperature, which requires high temperature resistance.
Safety valves are divided into two types: full start and micro start. The opening height of the full open safety valve is 1 4 of the throat diameter, which is a kind of safety valve with large flow discharge medium (generally used in steam or compressed gas). The opening height of the micro-opening safety valve is 1 20 or 1 / 40 of the throat diameter, and it is a kind of safety valve with small flow discharge medium (generally used in incompressible media such as water).
Full open safety valve: when used in steam medium, there is a sudden full open action, and the pressure when this sudden opening action is set pressure (sudden jump pressure); When used in air medium, the opening and opening height of the inlet pressure increase in proportion to that of the inlet pressure, and then the sudden take-off is fully open, which is called two-stage opening. Generally speaking, it can not be used in liquid media.
Micro-opening safety valve: the opening and opening height increases proportionately with the increase of inlet pressure, and the pressure decreases proportionately with the decrease of inlet pressure, which is generally used in liquid medium (or compressed gas when protecting pipe).
272, what is the function of gas heating boiler drum, do you have it, its material is generally what?
1. The main function of the drum is to accept the water from the economizer, to separate the steam and water and supply water to the circulation loop, and to transport saturated steam to the superheater. There is a certain amount of water in the drum, which has a certain amount of heat and working fluid savings, which can slow down the change rate of steam pressure when the working conditions change, and play a certain buffering role when the water supply and load are not coordinated for a short time. The drum is equipped with internal devices to carry out steam-water separation, steam cleaning, pot drug addition and continuous discharge to ensure steam quality.
2, not all gas heating boilers have drum, DC gas heating boiler does not have drum.
3. 12Mn steel, 16Mn steel, 19Mn6 steel, 15MnV steel, 14MnMoV steel and 13MnNiMoNb steel are commonly used in drum. The common gas heating boiler pipe steel is 12CrMo steel, 12Cr1MoV steel, 12MoVWBSiRE steel, 12Cr2MoWVB steel and 12Cr3MoVSiTiB steel.
