What is a diference between Steam boiler Vs Thermic fluid heater?

Question

1.0 Plz tell us heat content in thermic fluid as comapred with steam & also recommoned velocity.
2.0 We want to heat the water upto 90deg C is thermic fluid heater is good OR steam is good.?
3.0 What is a econmics of thermic fluid heater Vs steam on kcal heat energy produced?

Answer 1

Steam boilers raise the water beyond its boiling point, thereby adding much, much more heat energy (in the form of latent heat of vaporization) to the water. It takes roughly five times as much energy to convert saturated water (at 100°C, for example) into saturated vapor at the same temperature, than it does to take water at freezing point and bring it to the lower edge of the boiling point. So by using a steam boiler, you are not only not limited in upper temperature limit; you also have a thermal medium which carries many times more energy than hot water does. (Whether this is an advantage or a disadvantage, of course, depends on the details of your application).

Answer 2

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RE:
What is a diference between Steam boiler Vs Thermic fluid heater?
1.0 Plz tell us heat content in thermic fluid as comapred with steam & also recommoned velocity.
2.0 We want to heat the water upto 90deg C is thermic fluid heater is good OR steam is good.?
3.0 What is a econmics of thermic fluid heater Vs steam on kcal heat energy produced?

Answer 3

i'm a heat-process and thermodynamics engineer, and i work for a company which produces steam boilers and thermic fluid heaters.

1.
steam is the best fluid to transport heat. but in some situations thermic fluid should be prefered to steam. the temperature of saturated steam is determined by its pressure. for example if the demanded fluid temperature is 250 degC, the operation pressure of the steam boiler must be 39 bar-gauge. that's pretty dangerous. in this case, using a thermic fluid heater is better, because a thermic fluid heater operates at atmospheric pressure. but at lower temperatures, steam is the best option.

the recommended velocity of thermic fluid is 1,5 - 5 m/s (2 m/s is the optimum)

the recommended velocity of steam varies according to the pipe diameter (d)
if d < DN40, velocity should be 15 m/s
if DN40 < d < DN125 then 25 m/s
if DN125 < d then 40 m/s

2.
since you dont need high temperature (like 250 degC), i strongly recommend steam

3.
thermic fluid systems are expensive and the fluid in the system should be changed once in 5 years. the valves in this system must be sphero cast and the pressure norm should be PN25. those valves are much more expensive than cast iron valves (PN16). circulation pumps are needed in those systems; the electricity consumption of the pumps vary according to the heating capacity of the boiler (5 - 75 kW). an expansion (which should be installed at least 4m high) tank is needed in these systems.
Steam at 6 bar-gauge will work good in your process. circulation pumps are not needed to transport steam. the only pump needed is feed-water pump (0,15 - 11 kW). installation costs of steam boilers are lower than thermic oil boilers. PN16 cast iron valves (cheaper) are used in the system.

both systems consume the same amount of fuel.

IF I WERE YOU, I WOULD ABSOLUTELY PREFER A STEAM BOILER.

Answer 4

What Is Thermic Fluid

Answer 5

1. steam is more depending on the degree of superheat.
2. for 90 deg c thermic fluid heater is better.
3. depends on application and degree of superheat

Answer 6

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There is no difference some religions call them one or the other.

Answer 7

A boiler is a closed vessel in which water or other fluid is heated under pressure. The fluid is then circulated out of the boiler for use in various process or heating applications.

Construction of boilers is mainly limited to copper, steel and cast iron. In live steam toys, brass is often used.

Sources of heat for the boiler can be combustion of fuels such as wood, coal, oil, or natural gas. Electric boilers use resistance or immersion type heating elements. Nuclear fission is also used as a heat source for generating steam. Heat recovery steam generators, or HRSGs use the heat rejected from other processes such as gas turbines.

Boilers can also be classified into:-

Fire-tube boilers. Here, the heat source is inside the tubes and the water to be heated is outside.
Water-tube boilers. Here the heat source is outside the tubes and the water to be heated is inside.
A primitive, inefficient type where there are no tubes and the fire heats one side of the water container.
The goal is to make the heat flow as completely as possible from the heat source to the water. For example, steam locomotives have fire-tube boilers, where the fire is inside the tube and the water on the outside. These usually take the form of a set of straight tubes passing through the boiler through which hot combustion gases flow.


Diagram of a water-tube boiler.In water-tube boilers the water flows through a large number of narrow tubes around the fire. The tubes frequently have a large number of bends and sometimes fins to maximize the surface area. This type of boiler is generally preferred in high pressure applications since the high pressure water/steam is contained within narrow pipes which can contain the pressure with a thinner wall.

In a cast iron sectional boiler, sometimes called a "pork chop boiler" the water is contained inside cast iron sections. These sections are mechanically assembled on site to create the finished boiler.


Diagram of a Cornish Boiler.There are other types of boilers, largely of historical interest. For example, the Cornish boiler developed around 1812 by Richard Trevithick for generating steam for steam engines. This was both stronger and more efficient than the simple boilers which preceded it. It was a cylindrical water tank around 27 feet long and 7 feet in diameter, and had a coal furnace placed in a single cylindrical tube about three feet wide which passed centrally along the long axis of the tank. The fire was tended from one end and the hot gases from it travelled along the tube and out of the other end, to be circulated back along flues running along the outside of the boiler before being expelled via the chimney. This was later improved upon in the Lancashire boiler which had a pair of furnaces in separate tubes side-by-side. This was an important improvement since each furnace could be stoked at different times, allowing one to be cleaned while the other was operating. These designs are really primitive fire tube boilers, and led on to the Scotch boiler which remains a popular fire tube design.


[edit] Superheated Steam Boilers

A superheated boiler on a steam locomotive.Most boilers heat water until it boils, and then the steam is used at saturation temperature (i.e., saturated steam). Superheated steam boilers boil the water and then further heat the steam in a superheater. This provides steam at much higher temperature, and can decrease the overall thermal efficiency of the steam plant due to the fact that the higher steam temperature requires a higher flue gas exhaust temperature. However, there are advantages to superheated steam. For example, useful heat can be extracted from the steam without causing condensation, which could damage piping and turbine blades.

Superheated steam presents unique safety concerns, however, if there is a leak in the steam piping, steam at such high pressure/temperature can cause serious, instantaneous harm to anyone entering its flow. Since the escaping steam will initially be completely superheated vapor, it is not easy to see the leak, although the intense heat and sound from such a leak clearly indicates its presence.


[edit] Supercritical Steam Generators

Steam generation power plant.Supercritical steam generators are frequently used for the production of electric power. They operate at "supercritical pressure". In contrast to a "subcritical boiler", a supercritical steam generator operates at such a high pressure (over 3200 PSI, 22 MPa, 220 bar) that actual boiling ceases to occur, the boiler has no water - steam separation. There is no generation of steam bubbles within the water, because the pressure is above the "critical pressure" at which steam bubbles can form. It passes below the critical point as it does work in the high pressure turbine and enters the generator's condenser. This is more efficient resulting in slightly less fuel use and therefore less greenhouse gas production. The term "boiler" should not be used for a supercritical pressure steam generator, as no "boiling" actually occurs in this device.


[edit] Hydronic boilers
Hydronic boilers are used in generating heat typically for residential uses. They are the typical power plant for central heating systems fitted to houses in northern Europe (where they are commonly combined with domestic water heating), as opposed to the forced-air furnaces or wood burning stoves more common in North America. The hydronic boiler operates by way of heating water/fluid to a preset temperature (or sometimes in the case of single pipe systems, until it boils and turns to steam) and circulating that fluid throughout the home typically by way of radiators, baseboard heaters or through the floors. The fluid can be heated by any means....gas, wood, fuel oil, etc, but in built-up areas where piped gas is available, natural gas is currently the most economical and therefore the usual choice. The fluid is in an enclosed system and circulated throughout by means of a motorized pump. Most new systems are fitted with condensing boilers for greater efficiency.

Hydronic systems are being used more and more in new construction in North America for several reasons. Among the reasons are:

They are more efficient and more economical than forced-air systems (although initial installation can be more expensive, because of the cost of the copper and aluminum).
The baseboard copper pipes and aluminum fins take up less room and use less metal than the bulky steel ductwork required for forced-air systems.
They provide more even, less fluctuating temperatures than forced-air systems. The copper baseboard pipes hold and release heat over a longer period of time than air does, so the furnace does not have to switch off and on as much. (Copper heats mostly through conduction and radiation, whereas forced-air heats mostly through forced convection. Air has much lower thermal conductivity and higher specific heat than copper; however, convection results in faster heat loss of air compared to copper. See also thermal mass.)
They do not dry out the interior air as much.
They do not introduce any dust, allergens, mold, or (in the case of a faulty heat exchanger) combustion byproducts into the living space.
Forced-air heating does have some advantages, however. See forced-air heating.


[edit] Accessories

[edit] Boiler fittings
Safety valve: used to relieve pressure and prevent possible explosion of a boiler.
Water column: to show the operator the level of fluid in the boiler, a water gauge or water column is provided.
Bottom blowdown valves
Surface blowdown line
Circulating pump
Check valve or clack valve: a nonreturn stop valve by which water enters the boiler

[edit] Steam accessories
Main steam stop valve
Steam traps
Main steam stop/Check valve used on multiple boiler installations

[edit] Combustion accessories
Fuel oil system
Gas system
Coal system
Automatic combustion systems

[edit] Controlling draft
Most boilers now depend on mechanical draft equipment rather than natural draft. This is because natural draft is subject to outside air conditions and temperature of flue gases leaving the furnace, as well as the chimney height. All these factors make proper draft hard to attain and therefore make mechanical draft equipment much more economical.

There are three types of mechanical draft:

1) Induced draft: This is obtained one of three ways, the first being the "stack effect" of a heated chimney, in which the flue gas is less dense than the ambient air surrounding the boiler. The more dense column of ambient air forces combustion air into and through the boiler. The second method is through use of a steam jet. The steam jet oriented in the direction of flue gas flow induces flue gasses into the stack and allows for a greater flue gas velocity increasing the overall draft in the furnace. This method was common on steam driven locomotives which could not have tall chimneys. The third method is by simply using an induced draft fan (ID fan) which sucks flue gases out of the furnace and up the stack. Almost all induced draft furnaces have a negative pressure.

2) Forced draft: With this method draft is obtained by forcing air into the furnace by means of a fan (FD fan) and ductwork. Air is often passed through an air heater; which, as the name suggests, heats the air going into the furnace in order to increase the overall efficiency of the boiler. Dampers are used to control the quantity of air admitted to the furnace. Forced draft furnaces usually have a positive pressure.

3) Balanced draft: Balanced draft is obtained through use of both induced and forced draft. This is more common with larger boilers where the flue gases have to travel a long distance through many boiler passes. The induced draft fan works in conjunction with the forced draft fan allowing the furnace pressure to be maintained slightly below atmospheric.


Thermic reactions are chemical reactions which are thermic: either highly exothermic (producing heat) or endothermic (absorbing heat). Thermic reactions are often high temperature redox reactions, which either liberate tremendous amounts of heat, or require a massive amount of heat to proceed.