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What are the basic parameters of steam boiler?

Source: unknown popularity: Time of publication: 15:49, July 18, 2020
 Basic parameters of steam boiler
 

   Steam boiler Basic parameters

Evaporation capacity: the amount of steam produced by the boiler per hour is called evaporation capacity t / h, which is indicated by the symbol D. There are three kinds of boiler evaporation capacity: rated evaporation capacity, maximum evaporation capacity and economic evaporation capacity.

Rated evaporation capacity: the value indicated on the boiler product name plate indicates the evaporation capacity per hour of the boiler under the original design fuel type and long-term continuous operation under the original design working pressure and temperature.

Maximum evaporation: refers to the maximum amount of steam produced per hour in the actual operation of the boiler. At this time, the boiler efficiency will be reduced, so long-term operation under the maximum evaporation capacity should be avoided as far as possible.

Economic evaporation: when the boiler is in continuous operation, the evaporation when the efficiency reaches the highest is called economic evaporation, which is generally about 80% of the maximum evaporation.

Pressure: in the international system of units, the unit of pressure is expressed in Newton per square meter (n / C m2) symbol PA, which is called "Pascal" for short.

Definition: the pressure formed by the uniform distribution of 1n force on 1cm2 area.

One newton is equivalent to 0.102 kg, that is, 0.204 kg, and 1 kg is equal to 9.8 n.

The pressure unit commonly used in boilers is MPa, which means million PA, 1MPa = 1000kPa = 1000000pa

In engineering, the atmospheric pressure of a project is usually written as 0.098 MPa;

A standard atmospheric pressure is approximately written as 0.1MPa

Negative pressure is higher than the absolute pressure of atmospheric pressure and called the pressure gauge. The pressure is divided into absolute pressure and gauge pressure according to different pressure standards. Absolute pressure refers to the pressure from which there is no pressure in the vessel as the starting point, which is recorded as PJ; while the gauge pressure is the pressure from atmospheric pressure, which is recorded as Pb. Therefore, the pressure gauge pressure refers to the pressure higher or lower than the atmospheric pressure. The above pressure relationship is: absolute pressure PJ = atmospheric pressure PA + gauge pressure Pb.

Temperature: refers to the physical quantity of the cold and hot temperature of the object. From the microscopic point of view, it is the quantity that explains the thermal movement intensity of the object molecules.

Specific heat of a body: specific heat refers to the heat absorbed (or released) when the temperature of a unit mass material increases (or decreases) by 1 ℃.

Water steam: boiler is the equipment for generating steam. Under constant pressure, water is heated in the boiler to produce steam, which generally goes through the following three stages.

Water heating stage: the water fed into the boiler at a certain temperature is heated by constant pressure in the boiler. When the temperature rises to a certain value, the water begins to boil. The temperature of water boiling is called saturation temperature, and the corresponding pressure is called saturation pressure. The saturation temperature and saturation pressure are one-to-one, that is, a saturation temperature corresponds to a saturation pressure; the higher the saturation temperature, the higher the corresponding saturation pressure.

Generation of saturated steam: when the water is heated to the saturation temperature, if the constant pressure heating is continued, the saturated water will continuously generate saturated steam, and the steam volume will increase, and the water volume will decrease until it is completely vaporized. In the whole process, its temperature will not change.

Latent heat of vaporization: the heat required for heating 1kg saturated water to completely vaporize into saturated steam at the same temperature under constant pressure, or the heat released by condensing the saturated steam into saturated water at the same temperature is called latent heat of vaporization. The higher the saturation pressure, the smaller the latent heat of vaporization.

Generation of superheated steam: if the dry saturated steam is heated at constant pressure, the steam temperature will rise and exceed the saturated temperature. Such steam is called superheated steam.
 

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