Electric compression heat pump combined cascade heat exchange large-temperature-difference pressure isolation unit

Abstract

The invention discloses an electric compression heat pump combined cascade heat exchange large-temperature-difference pressure isolation unit. The problem of how to stably reduce the return water temperature of a primary network under the condition of meeting the pressure isolation function of a pressure isolation station simply and conveniently at low cost is solved; a pressure isolation heat exchange unit formed by sequentially connecting a plate heat exchanger and four electric compression heat pumps in series is arranged in the pressure isolation station between a primary pipe network anda secondary pipe network, high-temperature hot water of the primary pipe network is stably cooled to the design requirement of the return water temperature of the primary network in a stepped manner,and return water of the secondary pipe network is stably heated to the temperature close to the water supply temperature of the secondary pipe network in a stepped manner through replaced heat and issupplied out after being mixed with output water of the plate heat exchanger. According to the electric compression heat pump combined cascade heat exchange large-temperature-difference pressure isolation unit, and large-temperature-difference pressure-isolation heat exchange between the primary pipe network and the secondary pipe network is easily achieved at low cost.

Description

technical field [0001] The invention relates to a centralized heat supply system for cogeneration of heat and power, in particular to a large temperature difference pressure isolation heat exchange unit with a centralized electric compression heat pump combined with cascade heat exchange installed in a long-distance heat supply pipeline when the height difference is large. Background technique [0002] There are more and more long-distance transmission heating projects (hereinafter referred to as long-distance heating supply) in the central hot water heating system of cogeneration. In order to achieve the economy of heat energy transmission and make full use of the waste heat of power plants Thermal requirements The temperature difference between the supply water and the return water of the hot water delivery pipeline is greater than the temperature difference between the supply water and the return water of the conventional centralized hot water heating. When the return wat...

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Problems solved by technology

[0003] The invention provides an electric compression heat pump combination cascade heat exchange large temperature difference pressure isolation unit, which solves the technology of how to realize the stable reduction of the return water temperature of the primary network in a simple and low-cost manner under the condition of satisfying the pressure isolation function of the pressure isolation station question

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