Remote steam system having common recirculation of condensate an

Heating systems – Steam

Patent

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Details

137892, 122407, F24D 102

Patent

active

044796064

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method for condensate recirculation of at least two condensate flows, which are at different pressures and temperatures, in a closed circuit of a remote steam system. The invention is also based on a remote steam system having common recirculation of at least two condensate flows, at different pressures and temperatures, in a common condensate recirculation conduit.


BACKGROUND

In remote systems having heat consumers which operate at different temperatures and pressures, problems in recirculating the condensate frequently arise. The goal is to use one common collection conduit or main conduit for recirculating the condensate from all the consumers. However, when a common condensate conduit is used, the different pressures and the resultant different boiling temperatures cause condensate backups, evaporation and banging. These undesirable effects impair the functioning of the remote steam system.
It is therefore known in practice to provide devices for equalizing the temperatures of the different condensate flows, using condensate coolers or injection coolers, which may under some circumstances also be suitable for simultaneously recovering heat.
For pressure equalization between the various condensate flows, it is known to provide relief means or special fixtures for reducing pressure. However, these devices have the disadvantage that pressure equalization is attained at the cost of a substantial loss in energy.


THE INVENTION

It is an object to provide a method in which condensate flows at different pressures and temperatures can be fed into a common condensate recirculation conduit without externally supplied auxiliary energy and without any loss of energy. It is a further object of the invention to create a steam supply system in which condensate flows at different pressures and temperatures can be fed into a common condensate recirculation conduit without externally supplied auxiliary energy and without any loss of energy.
Briefly, condensate at the higher pressure is used to pump condensate at a lower pressure into a common condensation recirculation conduit, while at the same time the higher pressure and lower pressure condensates are mixed together. In accordance with a preferred feature of the invention, the pumping and mixing operation is carried out, simultaneously, in a single step and by a single element, namely by a jet, or injection pump. The method becomes very simple and the steam supply system becomes generally maintenance-free where the jet pump is used for pumping and mixing the various condensate flows.
In accordance with a feature of the invention, and in pressure and in sufficient quantity to effect pumping, the drainage condensate from the remote high-pressure steam conduit which has been collected in a container can be used as the pumping condensate, while in the steam supply system a container or vessel for collecting the drainage condensate is connected to the remote high-pressure steam conduit, and the drive mechanism of the pumping device is connected to this container or vessel.
Depending upon the outlet temperature of the mixing device, it may be efficacious to adapt the temperature of the intermixed condensate flows further to the temperature in the condensate recirculation conduit; to this end, the steam supply system is provided with a heat exchanger, which is disposed ahead of the pumping device in the flow direction.
If there is a further condensate flow which is at a pressure and temperature lower than those of the condensate flow exiting from the mixing device, then the further condensate flow can be pumped with a similar pumping and mixing device into the condensate recirculation conduit.


DRAWINGS

FIG. 1 shows a detail of a steam supply system according to the invention in schematic form; and
FIG. 1a is a fragmentary drawing of another embodiment.


DETAILED DESCRIPTION

The closed steam supply system 1 of the illustration, in which two schematically illustrated heat consumers 2 and 3 are provided with steam heat, includes a high-press

REFERENCES:
patent: 1046303 (1912-12-01), Josse et al.
patent: 1758295 (1930-05-01), Rosenblad
patent: 1916073 (1933-06-01), Rosenblad
patent: 1987883 (1935-01-01), White et al.
patent: 2484086 (1949-10-01), Harrison
patent: 2614543 (1952-10-01), Hood
patent: 3304006 (1967-02-01), Adams
patent: 3478726 (1969-11-01), Kikinis
patent: 3567589 (1971-03-01), Javet
patent: 3934799 (1976-01-01), Hull

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