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Trap selection of important factors
Trap selection must provide the trap hydrophobic capacity, also known as displacement (steam consumption), trap working pressure, operating temperature and other operating parameters, as follows: 1. Trap the amount of hydrophobic: the selection of traps , You must press equipment consumption per hour steam multiplied by the selection rate of 2-3 times the maximum amount of condensate, to select the trap drainage. In order to ensure that the trap drains the condensate as soon as possible while driving, the temperature of the heating device can be rapidly increased. Trap discharge energy is not enough, will result in condensate can not be discharged in time, reducing the thermal efficiency of heating equipment. (When the steam heating equipment just started to send steam, the equipment is cold, the interior is filled with air, the steam valve is needed to discharge the air rapidly, and then a large amount of low-temperature condensing water is discharged to make the equipment heat up gradually and then the equipment enters the normal working state. When a large amount of air and low temperature condensate, the lower the inlet pressure, so that the trap overload operation, when the trap requires a larger displacement than normal work, so the selection of the ratio of 2-3 times to select the trap.) 2 Traps work pressure: use traps, the nominal pressure can not be selected traps, because the nominal pressure can only be said that the trap body pressure level, traps nominal pressure and pressure vary widely. Therefore, according to the work pressure to choose the trap drainage. Working pressure is the working pressure before the trap minus the difference between the outlet pressure of the trap outlet. Trap back pressure calculation is: (When the trap condensate water is discharged into the atmosphere, the trap outlet pressure is zero. If the condensate drain trap drainage concentrated recovery, this time, the trap outlet pressure Is the return pipe resistance, the height of the return pipe, the secondary evaporator (backwater tank) and the pressure of the three.) 3. Mechanical Traps seat number: mechanical trap according to different working pressure, Divided into a variety of valve seat size "seat number", each work pressure difference and the "seat number" form a curve of the displacement, the different "seat number" of the amount of water is very different. Mechanical trap should be based on process conditions, the maximum working pressure and maximum displacement of the corresponding coordinate curve to select the appropriate "seat number." Can not be nominal pressure to set the "seat number", if the wrong "seat number", there may be trap does not work or equipment, water, affecting the normal operation of equipment. 4. Traps operating temperature: Selection of traps, according to the maximum temperature of the pipe steam to choose to meet the process conditions required trap. Pipeline steam maximum temperature exceeds the nominal pressure corresponding to the saturated steam temperature is called superheated steam, superheated steam pipe selection traps, should be selected high temperature and pressure superheated steam traps. 5. Trap connection size: After the trap process conditions are determined, according to the trap before and after the work of pressure, water and "seat number", according to the trap manufacturer's technical parameters to choose the size of traps size. (Not according to the size of the equipment connection optional matching the same size traps, traps the connection diameter can not represent the size of the amount of hydrophobic, with the same caliber traps, hydrophobic capacity may vary widely; so the choice of traps must be based on equipment Process conditions, with reference to the parameters provided by the trap manufacturers to choose the right trap is the right choice.