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| Bottle stopper means for wine bottles |
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Steam generating system including means for reinitiating the operation of a steam bound boiler feed pump
| Details |
Inventors: Norris, Orlin R.;
Assignee:
Primary Examiner: Wayner; William E.
Assistant Examiner: Tapolcai, Jr.; William E.
Attorney, Agent or Firm: Behr & Woodbridge
An improved steam boiler system includes an automatic means for injecting cool water into a steam bound boiler feed pump. In a first embodiment a pressure sensitive check valve detects the drop of pressure in the steam bound pump and in response thereto directs a cool water mist into the high side of the pump, thus reinitiating its operation. According to a second embodiment, cool water is sprayed into the pump in response to a drop of the water level in the boiler. In both embodiments, a vent line is used to bleed the high side of the centrifugal pump to a condensate tank in response to a drop of pressure in the pump. The vent line may be bled through a check valve or directly through a manual valve. Additionally, both embodiments employ a pressure sensitive valve in the boiler feed line, which shuts off the pump flow to the boiler whenever the pressure in the boiler exceeds the pressure at the output of the pump. The invention has the major advantage of reinitiating the operation of a steam bound boiler feed pump but has as an important secondary advantage the ability to keep the pump packing seals under liquid pressure, thereby preventing the packing from burning up in the event that the pump becomes steam bound. |
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DETAILED DESCRIPTION OF THE EMBODIMENTS During the course of this description, like numerals will be used to refer to like elements in the different drawings.
A water feeder type of steam generating system is schematically described in FIG.
1.
According to one embodiment of the present invention, the water feeder system includes the following basic components: A condensate tank 1; a suction line 3; a centrifugal boiler feed pump 5; a boiler feed line 14; a boiler or steam generator 17; and a heat radiating system 32, which returns the steam from the boiler 17 to the condensate tank 1.
The water level in the condensate tank 1 is numerically shown as 2 and this defines the boundry between the liquid and air phase of the reservoir.
In a typical operation, the temperature of the condensate tank is approximately 180.
degree.
F.
This higher temperature is desirable because it increases the overall efficiency of the system due to lower heat loss.
In the context of a steam generating plant it would be desirable to raise the reservoir temperature to 180.
degree.
F or more in order to increase efficiency.
Unfortunately, a steam plant operator has so many other duties that it is difficult for him to maintain such a high temperature.
The reservoir temperature cannot be kept at a higher temperature without constant monitoring of the generating equipment since at elevated temperatures, such as 180.
degree.
F, the water is more likely to flush into steam in the pump.
However, if the self clearing system of the present invention is employed, the condensate tank temperature can safely be raised up to 180.
degree.
F or above without additional supervision.
It is estimated that for each 11.
degree.
F increase in boiler waste or recovered and/or used steam or stack heat there is a 1% increase in overall plant efficiency.
Therefore, an increase of from 140.
degree.
to 180.
degree.
F can improve plant efficiency by about 3.
6%.
The liquid phase of condensate tank 1 is connected via suction line 3 to the low pressure side of centrifugal pump 5
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