I want to introduct something about micro pump. www.alldoo.com www.chinamicropump.com www.usmicropump.com Alldoo Micropump Co.,Ltd is a sci-tech enterprise which is specially engaged in the designing and production of various diaphragm micropumps,including diaphragm vacuum pumps,gas pumps,and liquid pumps with low flow range and small size.   It’s a new company located in Yueqing City,Zhengjiang, China,Shanghai is the nearest big city,transport is convenient.  The company takes a broad and long view. Relying on abundant technical strength,we devotes ourselves to the sci-tech development and design the micro pump series with reliable quality and reasonable price, suitable for the fields of gas or liquid transferring, cooling systems,sampling, medical or chemical analysis,blood pressure measuring,home appliance,toys and many other areas of industry applications.  We also design and produce micropumps according to the requirements of customers and accept OEM orders.micro pumps,micro pump,micro diaphragm p A Deareating Feed Tank (DFT), often found in steam plants that propel ships, is located after the main condensate pump and before the main feed booster pump.From the theoretical Rankine cycle diagram, there are four main processes, or steps:1 to 2 Water is raised from a low pressure to a high pressure (Pump work in) (feedwater pump)2 to 3 Water is heated to boiling (Heat input) (steam generator)3 to 4 Steam is expanded in a turbine (Work out) (turbine)4 to 1 Wet vapor is condensed (condensing) (surface condenser)In the practical implementation of a Rankine cycle, it is common to break the single pump (process 1 to 2) into three pumps: (in water flow order: condensate pump, feed booster pump and then feedwater pump). The DFT has three purposes:1. Remove dissolved oxygen (ir) from the condensate2. Pre-heat the feedwater3. Provide a storage/surge volumeDiscussion:1. Dissolved oxygen is removed by injecting auxiliary exhaust steam into the upper portion of the tank (above the feed water level) in roughly the same location (elevation) as the condensate is brought in at. The two are put in close physical contact over a large surface area to maximize heat transfer. As the condensate is heated the steam drives off any dissolved gasses. Since the steam is injected above the feed water level a steam blanket forms above the water to keep the non-condensable gasses from re-entering the feed water. There is a connection to the gland exhaust system on the upper portion of the DFT that withdraws the oxygen and other non-condensable gasses as they are driven from the condensate. The reason from removing the oxygen is to minimize corrosion and improve the vacuum quality.2. The steam heats the water in the tank3. The water in the tank serves as a surge volume within the steam plant.Why a surge volume?This allows for the plant to change bells (power output level) without running the feed pump dry or flooding the turbines. Consider the plant running in a steady state condition.The bell is increased, more power output demanded, the rate of feed is increased. This draws more water from the condenser, perhaps to the point of being dry and starving the boiler and causing a loss of propulsion. This is until the water is converted to steam, provides its energy to the turbine and then is condensed in the condenser.The bell is decreased, less power output demanded, the rate of feed is decreased. Since less water is drawn from the condenser the condensate level rises, covering more condenser tubes, reducing the ability of the condenser to maintain vacuum and if the level is allowed to go high enough vacuum could be lost and/or water could impinge (and damage) the turbine blades as the turbine normally sits directly above the condenser.Categories: Steam powerHidden categories: Orphaned articles from February 2009 | All orphaned articles | All pages needing to be wikified | Wikify from February 2009(and so on) To get More information , you can visit some products about discounted snow blower, glass bottle manufactory, . The micro pump products should be show more here!
Tags: Deareating, feed, tank
