Heating systems – Steam
Patent
1982-01-28
1984-10-16
Makay, Albert J.
Heating systems
Steam
237 59, 237 6, F25C 118
Patent
active
044770219
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the regulated transfer of heat from a primary steam network to a heat consumer in which steam flow is supplied at a predetermined excess pressure and return flow is at a relatively low pressure. The invention furthermore relates to an apparatus for performing this method, having a heat exchanger which is regulated on the steam side in accordance with the consumption of heat by the heat consumer.
BACKGROUND
In supplying heat to a heat consumer from a steam network, it is known to provide a heat exchanger between the steam network and the heat consumer, the heat exchanger being regulated on either the steam or the condensate side and the heat consumer being located in the secondary circuit of the heat exchanger. A pump is required in the secondary circuit in order to generate the required operating pressure.
The pressure difference prevailing on the primary side, between the steam supply line and the condensate return line, is utilized solely to assure a flow through the heat exchanger on the primary side; it necessitates a corresponding expenditure for pipes and fittings, in which energy losses occur.
THE INVENTION
It is the object to point the way to utilizing the existing steam pressure of the steam network, when effecting heat transfer from a primary network to a heat consumer, in such a manner that the operating energy for the flow of the heat consumer can be derived from the primary steam network.
Briefly, according to the invention the steam drawn from the steam network in accordance with the heat consumption by the heat consumer is cooled to the point of condensation by the removal of heat in a heat exchanger using a secondary medium. A predetermined excess pressure relative to the circulating pressure of a secondary heat carrying medium supplying the consumer is maintained. The excess pressure is used in an injector pump and there reduced to the circulating pressure of the medium for the heat consumer, generating a corresponding operating energy for the flow system therein. The secondary medium, which has been heated in the heat exchanger as the steam cools, is admixed to the flow.
The cold secondary medium may efficaciously be diverted from the cooled return flow from the heat consumer.
In this method, the vapor pressure of the steam network can be utilized directly for generating operating energy for the flow of steam to the heat consumer, so that a separate circulation pump for the heat consumer can either be eliminated or, should such a pump be required anyway because of the network resistance, it may be designed for a substantially smaller output.
The apparatus includes, in accordance with the invention, the heat exchanger, which is connected to the steam network via a regulating valve and which cools the supplied steam down to the condensation point. It is connected to the condensate side with the operating nozzle of an injector pump located in the flow line of the heat consumer. The operating nozzle of this pump is exposed to the condensate, which is at a predetermined excess pressure, and on its intake side the pump is disposed in a secondary circuit of the heat exchanger in which secondary medium flows which has been heated by the steam, this secondary medium can be mixed by the injection pump in predetermined proportions with the steam flow in the heat consumer network.
The apparatus is efficaciously disposed such that the secondary circuit of the heat exchanger branches off from the return flow line of the heat consumer, the return flow line being connected directly to the condensate line of the steam network via appropriate regulating devices.
The injector pump is advantageously of the type which can be regulated, so as to enable adaptation to heat exchanger conditions.
Should the operating energy generated by the injector pump be insufficient, then an additional pressure-elevating pump can be located in the flow line of the heat consumer, behind the injector pump in terms of the direction of flow. However, this pressure-elevating pump needs to
Bennett Henry
Makay Albert J.
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