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Mar 04, 2019 · the boiler should get good fuel efficiency, and, based on both makeup and treatment dissolved solids, the total boiler water dissolved solids should not go so high that carryover, scaling and corrosion are a potential problem. Chlorides may be maintained in the 60-200 range. The chloride concentration is controlled by boiler blowdown.
Advantages of water-tube boilers: They have a small water content, and therefore respond rapidly to load change and heat input. The small diameter tubes and steam drum mean that much higher steam pressures can be tolerated, and up to 160 bar may be used in power stations.
• The Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. • Lochinvar should be consulted before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive
3.Two types of high pressure water tube boilers are specified, flex tube and D-type. The two boiler types are significantly different, and only one of the two types should typically be specified if all new boilers in a given project are similar. 4.Flex tube boilers: a)Primarily for non-critical service firing gas fuel and with stable steam demands.
Boiler Tube Brushes: Furnish hand brushes of sizes, and with handle lengths, to clean full length of all tubes in boiler. Provide handle and extension sections 1800 mm (6 feet) long or less to permit storage. Coupled lengths shall be suitable for use from front of boiler.
Consulting - Specifying Engineer | Boilers: Types, applications, and
tube by creep rupture. Overall efficiency can be defined as the ratio of steam output to the fuel consumption ratio. Again, since scaling impedes heat transfer, more fuel is required to produce a given amount of steam, thus reducing overall efficiency and loss of energy. Eventually, removal of scale from the boiler becomes essential if damage to the boiler is to be prevented.
water to prepare a consistent, satisfactory quality boiler feedwater. x Internal treatment: Chemical treatment of the boiler water to control mineral scaling, corrosion and general deposition in the boiler drums and boiler tubes. x Condensate treatment: Chemical treatment of …
Apr 14, 2014 · A well-designed economizer can reduce flue gas temperatures to 170 F. As a rule of thumb, every 40 F reduction in flue gas temperature increases boiler efficiency by 1%. In a fire-tube boiler, hot combustion gases enter the tubes in a turbulent flow …
tube boilers, typically have a lower initial cost, are more fuel efficient and easier to operate, but they are limited generally to capacities of 25 tons/hr and pressures of 17.5 kg/cm2. Water tube or "water in tube" boilers in which the conditions are reversed with the water passing through the tubes and the hot gasses passing outside the tubes (see figure 2.3). These boilers can be of single- or multiple-drum type.
Superheater—tubes located near the boiler outlet that increase (superheat) the temperature of the steam, p. 297. Waste heat boiler—a device that uses waste heat from a process to produce steam, p. 297. Water tube boiler—a type of boiler that contains water-filled tubes that allow water to circulate through a …
Problems in Boilers – Marine Study
improving the efficiency of a high pressure steam boiler is to install an economizer on the boiler. Typically, on a high pressure water tube boiler, the efficiency improvement with an economizer is 2 to 4%, depending on firing rate. On a high pressure fire tube boiler, the improvement is 2 to 3.5%, depending on boiler size and firing rate.
Water-tube boilers tend to be higher rated, perhaps over 1 000 tonnes/h of steam. This means that even a small percentage blowdown can represent a high mass to be blown down. Water-tube boilers tend to operate at higher pressures, usually up to 150 bar g. The higher the pressure, the greater the energy contained in the blowdown water.
Blowdown of boiler water is adjusted to prevent undesirably high levels of dissolved solids and suspended solids that are circulated in the boiler water. III.B.3 Chelation. Metal cations found in boiler water, such as calcium, magnesium, iron, and copper, can be solubilized to prevent deposition and scale formation. The functional agents in
Mar 12, 2016 · It makes the boiler material. softer and Weaker. This causes distortion of boiler tube and also makes the boiler unsafe to bear the pressure of the steam, especially in high-pressure boilers. (iii) Decrease in efficiency : Deposition of scales in the valves and condensers of the boiler, choke them partially. The removal of foaming agent
Jul 02, 2019 · A water tube boiler produces steam in as little as five minutes, compared to an hour or more for fire tube boilers. As a result, fuel savings costs can be significant over time. Water-tube boilers require less water.
How To Find The Most Efficient Industrial Steam Boiler. The merits of efficiency are immense. That's especially true when it comes to industrial boilers.Considering that many companies, plants, and campuses use their boilers for a variety of purposes (i.e., heating systems, hot water, cleaning, production, etc.), an efficient boiler room can save a multitude of costs over its lifetime.
Boiler water carry-over is the contamination of the steam with boiler-water solids. Bubbles or froth actually build up on the surface of the boiler water and pass out with the steam. This is called foaming and it is caused by high concentration of any solids in the boiler water. It is generally believed, however, that specific substances such as alkalis, oils, fats, greases, certain types of
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