Boiler working principleI

　　Boiler working principleI. primary conceptsWhat is a boilerEquipment for the production of steam, hot water or different working media of designated parameters (temperature, pressure) and quality by using heating water or other working media from warmth or other thermal electricity launched from gas combustion.Boiler is a kind of power conversion equipment, the energy input to the boiler has the chemical energy in the fuel, electric energy, excessive temperature flue fuel thermal power and different forms, and after the boiler conversion, the output has a positive warmness strength steam, high temperature water or organic heat carrier. The original that means of the boiler refers to a water container heated over a fire, and the boiler refers to a vicinity the place gas is burned. The hot water or steam generated in the boiler can directly furnish the required warmness energy for industrial production and people's life, and can also be converted into mechanical energy thru the steam power plant, or into electrical electricity via the generator. The boiler that presents warm water is called the hot water boiler. It is in general used for living, but there are also a few functions in industrial production. The boiler that produces steam is called steam boiler, often abbreviation is boiler, use in thermal electricity station, ship, locomotive and industrial and mining enterprise more.Boiler is a kind of thermal equipment that USES the heat power released after fuel combustion or the waste warmth in industrial production to transfer to the water in the container so that the water can reach the required temperature (hot water) or certain strain steam. It is by using "boiler" (namely boiler physique water strain part, warmness absorption part is called A entire unit of attached equipment. For example, water cooling wall, superheater, economizer and different components of the warmness absorption can be considered as a pot; And furnace, burner, fuel pump, feed, triggered fan can be viewed as. Furnace.Boiler in the "pot" and "furnace" two parts at the equal time, water into the boiler, the boiler heating surface in the system will take in the warmth switch to the water supply, so that the water heated to a sure temperature and pressure.wUNBoiler Burner

　　The warm water or generated steam is drawn out for application. In the combustion equipment part, the gas combustion consistently gives off the heat, the combustion of excessive temperature flue fuel via the warmth transmission, the heat switch to the boiler heating surface, and the temperature progressively decreases, eventually via the chimney.Main working system of boiler:1) fuel combustion process: lamination: coal? Coal bucket? Grate 1 (complete combustion)? High temperature flue gas2) warmth transfer method of flue fuel to working medium: excessive temperature flue gas -(radiation)? Water wall -(radiant convection)?Slag tube -(radiation convection)? Overheating, warmness transfer tube -(convection)? Economizer -(dust elimination and desulfurization)? Low temperature smoke is discharged into the atmosphere3) heating and vaporization manner of working medium: water provide (system water provide water)? To the water tank? Pump? Economizer? Pot one (down tube)? Fixation of box? Water-cooled wall tube bundles -(radiant convection soda mixture)? Separator? Saturated vapor? Superheater? Superheated steam? User preferencesIt is the main index that expresses boiler performance, encompass boiler capacity, steam pressure, steam temperature, feed water temperature, boiler potential can be expressed with rated steam potential or most non-stop steam capacity.Rated evaporation is the amount of steam produced consistently per unit of time at distinct outlet pressure, temperature and efficiency. The maximum non-stop steam capacity is the most continuous steam potential per unit time beneath the certain outlet strain and temperature.wUNBoiler Burner

　　Steam parameterIncludes the boiler steam strain and temperature, normally refers to the superheater, reheater outlet superheated steam pressure and temperature, if there is no superheater and reheater, refers to the boiler outlet saturated steam stress and temperature. The feed water temperature refers to the inlet water temperature of the economizer· water temperature.Capacity of the boilerA boiler's capability to furnish heat. Large ability heating capacity, giant output; The opposite is small.wUNBoiler Burner

　　The ability of water to turn out to be saturated vapor at a given pressure.Pressure of workWorking stress refers to the most allowable strain of the boiler. The working pressure is decided according to the layout stress and is typically expressed as MPa.Boiler pressureThe boiler stress (pressure) regularly referred to in the boiler industry refers to the force perpendicular to the unit wall place of the vessel, represented with the aid of "Mpa", the old unit "kg force /cm2" (KGF /cm2). The rated temperature, additionally known as rated temperature. The temperature indicated on the boiler nameplate is the temperature of the medium at the outlet of the boiler (D).The quantity of steam produced through a steam boiler in the long term secure operation, that is, the steam produced by means of the boiler, is expressed as "D" in lots per hour (t/h). The water in the saturated steam boiler is heated at a sure stress by means of the heat launched by using the combustion of gas and boils, vaporizing into steam. The temperature of the boiler water in this boiling country is saturated steam. The higher the strain in the pot, the higher the temperature of saturated steam. Such as 1.0 Mpa saturated steam temperature 184? 1. 25 Mpa.wUNBoiler Burner

　　Superheated steamSteam whose temperature is greater than the saturation temperature at the corresponding strain is called superheated steam. Superheated steam has high enthalpy, high entropy and excessive work capacity. Superheated steam with the same mass as saturated steam can be used as a warmth source to elevate the temperature of the heated medium.Thermal electricity (heat provide Q)When the hot water boiler runs safely for a long length of time, the water comes out with positive warmness per hour. That is, the thermal strength of the boiler, expressed by means of "Q", is megawatt (Mw), the engineering unit is 104 kcal/h(104Kcal/h)。wUNBoiler Burner