The vacuum boiler mainly refers to the micro-negative pressure boiler whose internal gas pressure is lower than the external atmospheric pressure. The lower the gas pressure, the lower the boiling point, so that the water boils at low temperature and generates steam, and the overall efficiency of the boiler is higher.
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Vacuum boilers on the market today can be divided into two categories according to fuel.
First, electric heating vacuum boiler.
When the electric heating vacuum boiler is operated, its internal environment is in a vacuum state. At this time, the oxygen in the intermediate medium water is discharged to the outside of the electrothermal vacuum phase change boiler, so that oxidative corrosion is not caused in the boiler, which may cause damage to the equipment. At the same time, the material of the heat exchanger part of the electric vacuum hot water boiler is made of stainless steel and will not corrode. In addition, the electric vacuum hot water boiler only needs to add a small amount of heat medium water at a time, and it will not increase or decrease during operation, so there is no scale inside.
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Second, fuel (gas / coal) vacuum boiler.
Most of these vacuum boilers use imported burners, which have high combustion efficiency and extremely low noise and exhaust emissions. Internally, an exchanger made of stainless steel is used to ensure high heat exchange efficiency and to ensure clean water quality. At the same time, its smoke pipe is equipped with a spiral spoiler to improve heat transfer efficiency and reduce operating costs. In addition, it adopts a square structure as a whole, and the boiler and the heat exchanger are designed in one piece, which makes the structure compact and small in appearance.
Through the above classification of vacuum boilers, and to illustrate the characteristics of different categories, so that everyone knows their relevant knowledge. This part of the knowledge is the basic knowledge of the purchase of vacuum phase change boilers, we need to keep in mind, in order to make the most suitable choice when choosing the purchase, choose the boiler equipment.
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How do they create a Vacuum on a boiler to reduce the boiling temperature? Water will Boil at a lower temperature than 212F (100C) if the atmospheric pressure is reduced. Some recipies for food actually had special instructions for "Baking at higher altitudes". Well, I don't want to bake a cake. Frank Schuman developed some type of special steam engines that somehow ran off steam generated at a lower temperature. I found references to them using this process on ships engines as well. How does this work? Somehow you create a vacuum on a boiler? Then how does it produce pressure? What's the deal?
Thanks, Bewildered.
Vaccuum is created on condensing engines where the exhaust steam is condensed back to water for the boiler. the act of condensing steam causes a bit of vacuum, but they also have a pump that is either driven off from the engine, or a separate steam powered pump, which serves to pump the condensate from the condenser to the hotwell, as well as removing any air that might also accumilate. The whole idea is that by pulling a vaccuum on the exhaust side of an engine. the engine is able to produce more power with less steam. it eliminates any back pressure where the piston has to push the exhaust steam out of the passages. It is a very commonpractice on marine engines, as well as stationary.
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I should add that producing a vaccuum on a boiler to get the water to boil at a lower temperature would be self defeating. as soon as steam pressure is raised, vaccuum goes away. the only practical use of this principal that I know of is to use produce a vaccuum using a pump to remove any moisture from a refrigeration system before charging it with refrigerant.
Hi Lyndon
It sounds to me like you are describing an evaporator. We used to use them to make additional feed water for our boilers. They generate steam under a 30" or so vacuum and so this might be what you are looking for. They also make a version of this for diesel power plants where excess heat from the jacket water system (which is usually below atmospheric boiling point of 100 deg c) is used to boil water under a vacuum. The vacuum is created by using an ejector which receives is water supply used for both condensing and initial feed to the unit. Hope this helps
Cheers Al
Actually they did use it in a steam heating system, one trade name was the "vapor-vac" system. After the air was released through the mechanical air vents they would remain closed, it took special radiator valves and the system had to be keep tight. Worked better with the old coal firing. In milder weather the system heated while it was still in a vacuum, on sever cold in would be more in the vapor mode just barely. Have one left still operating, but with modern boiler just runs in the vapor mode and sizzles along in the vacuum untill the next call for heat. Dad said they started to use it somewhat in larger commercail such as schools, but the pipe sizes began to get pretty big with it. At that time they started to fully pressurize so they could have zoning with pneumatic controls, even in the early days, as well as vacuum pumps in the return.