Analysis of Trap Selection Method

Traps and Selection Method Traps are devices that automatically exclude steam condensate, air, and other non-condensable gases from heating equipment or steam pipes, while not leaking steam. As the steam trap has the role of gas drainage, steam heating equipment can make uniform heat, make full use of latent heat of steam to prevent steam pipe in the water hammer. It is to ensure that a variety of heating process equipment required temperature and heat and can work a kind of energy-saving products. 2.1 Traps classification Traps many varieties, each with different properties. Traps to be able to "identify" steam and condensate in order to play the role of gas blocking drainage. "Identifying" steam and condensate is based on three principles: density difference, temperature difference and phase transition. Three types of traps are made according to three principles: mechanical, thermostatic and thermodynamic. ① mechanical trap, also known as the float trap, is the use of condensed water and steam density difference, through the condensate level changes, so that the float (spherical or barrel) lift valve disc to open or close, to block the water drainage purpose. Mechanical type of small degree of supercooling traps, not subject to changes in pressure and temperature, the water that is row, no water heating equipment, heating equipment can achieve the best heat transfer efficiency. Mechanical traps are free float, lever float, float bucket, inverted bucket bucket, etc .; ② thermostatic steam trap is the use of steam and condensate temperature difference caused by the temperature change of components or expansion drive valve Heart opening and closing valve. The thermal underfill trap has a large degree of subcooling, generally ranging from 15 degrees to 40 degrees. It can make use of part of the heat in the condensate water. There is always high temperature condensate in front of the valve, without steam leakage, and the energy-saving effect is remarkable . Thermostatic trap with a bellows, steam pressure or pressure balanced, bimetallic, liquid expansion; ③ thermodynamic trap is based on the principle of phase change, by the flow of steam and condensate flow and Different thermodynamic principles of volume change, the pressure difference up and down the valve, drive the valve switch valve. Due to the work force of the thermodynamic steam trap is derived from the steam, the steam is wasted. Thermodynamic steam trap is divided into disc type, pulse type, labyrinth or micro-hole type. 2.2 Trap Selection Description steam in the transport, steam separation, heating, drying, insulation, heating, disinfection, distillation, concentration, cooking, heat transfer, heating, air conditioning and other heating process, in order to ensure that all kinds of equipment and processes required The temperature and heat, timely discharge of condensate to prevent steam leakage, trap must be installed. For the selection of steam traps, requiring high sensitivity, accurate blocking steam drainage, no leakage of steam, can improve steam utilization, reliable performance, high back pressure, long life, easy maintenance and other conditions. Steam traps selection principle: ① If the equipment requires the fastest heating rate, heating temperature control strictly, and keep in the heating equipment can not be stored in the condensate, you should choose a row of saturated water mechanical trap; ② If the heating Equipment has a larger heating area, does not require heating as soon as possible, the heating temperature is not strict, and can require the accumulation of a certain amount of condensate, the choice of thermostatic steam trap; ③ According to the amount of equipment used to drain, use the trap Be sure to consider the safety factor; ④ trap pressure to determine the displacement. Specific selection instructions are as follows: ① mechanical trap the maximum back pressure of 80%, high-quality workmanship, the production process is the ideal heating equipment traps. Small diameter valve sensitivity of the larger diameter of the door. In addition to inverted bucket traps can exclude a small amount of hot and cold air, such valves can not rule out the air. Free float structure is simple, high sensitivity, can be drained of water, water resistance, anti-fouling ability, suitable for large diameter and large displacement, but the manufacturing process is complex. ② Thermostatic trap can be installed in the upper part of the steam equipment, simply for exhaust air valve use. Liquid Expansion For the requirements of the heat tracing temperature with lower condensate and heating pipelines. Vapor pressure or balance pressure type structure is simple, action sensitive, continuous drainage, exhaust air, good performance, small amount of leakage, but resistance to water hammer and anti-fouling ability, wide range of applications, can be used as the steam system of the air valve . Bellows is widely used as a hydrophobic heating system can also be used as the steam system of the exhaust valve. Bimetal action is not high sensitivity, continuous drainage, drainage performance is good, large and adjustable subcooling, from low to high pressure are applicable, the maximum temperature up to 550 ℃. Anti-dirt, anti-water-resistant strong. ③ thermodynamic steam trap condensate treatment of high sensitivity, opening and closing pieces of small inertia is small, the switching speed. Disc traps for high temperature and pressure steam lines, dryers, heaters and superheated steam equipment. Pulse trap back pressure is low, suitable for rotary drying drum siphon drainage, can exclude a certain amount of hot and cold air. Labyrinth or microporous traps have a simple structure and can continuously drain and discharge air. Micro-hole for small displacement, labyrinth for large displacement. More Search Keywords: Traps

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