Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Steam boilers economizer

For some applications, either steam or electricity is simply not available and this makes the decision. It is rarely economic to install a steam boiler just for tracing. Steam tracing is generally considered only when a boiler already exists or is going to be installed for some other primary purpose. Additional electric capacity can be provided in most situations for reasonable costs. It is considerably more expensive to supply steam from a long distance than it is to provide electricity. Unless steam is available close to the pipes being traced, the automatic choice is usually electric tracing. [Pg.1013]

Section 38 of the Factories Act 1961 defines a steam boiler as a any closed vessel in which for any purpose steam is generated under pressure greater than atmospheric pressure . Economizers used to heat water being fed to such a vessel and superheater for heating steam are also included. Every boiler must be fitted with the recommended safety measures (e.g. safety valve, stop valve, water gauge, low-water alarms, pressure gages, etc.). [Pg.1064]

There are various WT and FT boiler economizer designs, classified as either steaming economizer and nonsteaming economizer types according to thermal performance. These economizers are constructed in either bare tube or finned tube (extended surface) patterns. They may be positioned horizontally or vertically within the boiler system, in either cross-flow or counterflow arrangements. [Pg.86]

Economizers improve boiler thermal efficiency by recovering heat from the combustion flue gases exhausted from the steam boiler section. The recovered heat is used to heat colder streams (heat sinks), before ultimate discharge of the waste gas to atmosphere. This recovered heat displaces the need to bum additional fuel to heat these same streams. [Pg.51]

Incorporating an air heater (to utilise low-level heat) on a steam boiler can be more economic than using a hot-oil system which is designed for high-level heat only. [Pg.149]

Figure 8.1 BKZ-320-140GM impinging stream steam boiler. 1 burner 2 combustion space 3 secondary combustion space 4 steam superheating 5 water economizer. Figure 8.1 BKZ-320-140GM impinging stream steam boiler. 1 burner 2 combustion space 3 secondary combustion space 4 steam superheating 5 water economizer.
Gas cooling between catalyst beds is done in water-to-steam boilers, superheaters, economizers and gas-to-gas heat exchangers. Gas composition doesn t change in these cooling devices because they don t contain catalyst. [Pg.163]

Fire 1.4. Steam boiler and furnace arrangements. [Steam, Babcock and Wilcox, Barberton, OH, 1972, pp. 3.14, 12.2 (Fig. 2), and 25.7 (Fig. 5)]. (a) Natural circulation of water in a two-drum boiler. Upper drum is for steam disengagement the lower one for accumulation and eventual blowdown of sediment, (b) A two-drum boiler. Preheat tubes along the Roor and walls are cormected to heaters that feed into the upper drum, (c) Cross section of a Stirling-type steam boiler with provisions for superheating, air preheating, and flue gas economizing for maximum production of 550,000 Ib/hr of steam at 1575 psia and 900°F. [Pg.10]

In order to use the steam most economically, it is necessary to take care that no more steam is used than will conveniently condense, so that only hot water may leave the apparatus. This may be either used for feeding the boiler or for other purposes where hot water is required, or it may be taken through suitable coils placed in the liquid which feeds the boiling-down pan, and thus serve to give that liquid a preliminary heating. [Pg.17]

In the production of steam in a steam boiler, in the evaporation of liquids, in the carrying out of melting processes, everything depends upon the economical utilisation of fuel and although, in practical work, the results obtained are often very different from those which would be expected from theoretical considerations, yet it is necessary to understand the theory of the subject. As the chief material used as fuel in this country is coal, we will confine our remarks to a short consideration of the utilisation of that material. [Pg.71]

While the above options consider use of large amount of North Slope gas there are other options which use small amounts of North Slope gas and should also be considered. One such option Is utilizing natural gas in the form of utilities for local usage. Gas turbine and steam boiler co-generator technolgies to convert natural gas into electricity are conventional and well proven commercially. The size of power plant facilities will be dictated by the local Alaskan market and economics. For large metropolitan areas like Fairbanks and Anchorage, utilization of North Slope gas by utilities does not look economical especially due to the fact that much closer Cook Inlet gas and Kenai gas fields can serve the same purpose for next 20-25 years. Other option that does not look economically attractive at the present Is the use of natural gas In the form of fuel cells. [Pg.152]

It is essential to have services available in sufficient quantities and of the correct quality to meet all production requirements. Many services are required by more than one process plant and it is, therefore, often economical to produce the service required at a central point in the factory and distribute it. There may be more than one source of the same service for example, two or more steam boilers, when it is usual to interconnect the distribution so that a more reliable supply is provided. It is clearly essential that the services must be maintained to a high standard, as their failure will affect many, or possibly all, process plants. [Pg.124]

A new method of utilization of waste gas heat is provided by precalcining systems with bypass, in which up to 100 per cent of the kiln exit gases can be economically bypassed arrd be utilized in a steam boiler, without reqttiring arty eooling. [Pg.52]

The boiler feed water is condensed steam after electricity generation that has been conditioned in a deaerator. The boiler feed water is preheated in economizers prior to entering the heat recovery boiler. Economizers are heat exchangers that transfer heat to boiler feed water while cooling gases entering intermediate and final absorption towers (Chapter 9). [Pg.28]


See other pages where Steam boilers economizer is mentioned: [Pg.270]    [Pg.390]    [Pg.1035]    [Pg.818]    [Pg.10]    [Pg.55]    [Pg.60]    [Pg.2772]    [Pg.10]    [Pg.358]    [Pg.292]    [Pg.412]    [Pg.418]    [Pg.183]    [Pg.125]    [Pg.354]    [Pg.1068]    [Pg.46]    [Pg.120]    [Pg.71]    [Pg.413]    [Pg.58]   
See also in sourсe #XX -- [ Pg.469 ]




SEARCH



Boilers economics

Economizers boilers

Steam boilers

© 2024 chempedia.info