Liquid heaters and vaporizers – Plants – Feed water heaters
Patent
1983-09-21
1985-11-05
Favors, Edward G.
Liquid heaters and vaporizers
Plants
Feed water heaters
122412, 165159, 165163, F22B 3300
Patent
active
045506876
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for operating a high-pressure boiler, in particular for dry-cleaners, laundries or the like, with consuming units which are connected to a high-pressure boiler and the condensate from which is returned to a condensate tank from which, by means of a feed water pump, feed water is fed to the boiler and the condensate and feed water are fed to a heat exchanger upstream of the condensate tank.
The invention also relates to equipment (a heat exchanger) which, in particular, is suitable and intended for carrying out the process.
Any high-pressure boiler installation is provided with a condensate return. The condensate consists of the mixture of wet steam at about 105.degree. C. and a condensed hot water/steam mixture at about 90.degree.-100.degree. C.
The hot condensate is normally collected again in a condensate tank of the boiler installation. The boiler feed water pump then forces this hot water back into the superheated steam boiler, where renewed vaporisation takes place. Since water above 80.degree.-85.degree. C. causes difficulties with the pumps in the boiler, either very large condensate tanks are provided or the condensate is cooled additionally. On the other hand, this leads again to difficulties if the condensate is unduly cold (for example 60.degree. C.), since soot then deposits on the boiler heating surfaces or boiler heating lines. It is also known to provide the condensate tanks with an exit gas branch, through which the wet steam can escape. It is the purpose of all these measures to cool down the very hot condensate, if possible, so that a condensate temperature of 60.degree.-70.degree. C. upstream of the pump is ensured.
High heat losses are incurred in such superheated steam boilers. A boiler unit of this type also requires a long running-up period on start-up, until the superheated steam has reached its necessary temperature.
SUMMARY OF THE INVENTION
It is therefore the object of the invention to improve the operating conditions of such a superheated steam boiler unit in such a way that the heat content of the condensate is utilised, the heating-up period of the boiler is shortened and damage to the lines and the boiler, for example due to precipitating SO.sub.2, is avoided.
According to the invention, this object essentially is achieved when the hot condensate is fed to the free space of the heat exchanger, and the feed water to be heated is pumped into the heat exchanger, passed helically in the heat exchanger from the cold zone to the hot zone and is fed from the heat exchanger into the boiler.
In an advantageous manner, the process is run in such a way that the condensate flowing in at a temperature of about 90.degree.-105.degree. C. is cooled in the heat exchanger to about 50.degree. C. and returned from the feed water tank to the heat exchanger at a temperature of about 40.degree. C. and is fed at a temperature of about 90.degree.-95.degree. C. or higher to the boiler.
It is a further object of the invention to provide equipment, in particular a heat exchanger, by means of which the heat of the condensate from a boiler unit can be utilised in an optimum manner for increasing the temperature of the feed water, the greatest possible energy saving for the operating of the boiler can be achieved and can be adapted in a simple manner to varying operating conditions or varying sizes of the high-pressure boiler, for example, higher output, and the performance of the heat exchanger can also be controlled as a function of the condensate rate.
According to the invention, this object is achieved in a heat exchanger which is particularly suitable for carrying out the process according to the invention and which comprises a vessel with a pipe, disposed therein, for one medium and a connection for the second medium, when connections, ending in the cover of the vessel, for a first condensate line, a feed water feed line and a feed water discharge line as well as a second condensate line are provided, and when a feed water coil arrang
REFERENCES:
patent: 1938072 (1933-12-01), Karlsteen
patent: 1939415 (1933-12-01), Schaub
patent: 2115548 (1938-04-01), Artsay
patent: 3367309 (1968-02-01), Plagman, Jr.
patent: 4202406 (1980-05-01), Avery
LandOfFree
Apparatus for operating a high pressure boiler does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for operating a high pressure boiler, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for operating a high pressure boiler will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-291172