Efficient heat exchanger for medium-deep geothermal energy

Abstract

The invention discloses an efficient heat exchanger for medium-deep geothermal energy, belongs to the technical field of terrestrial heat, and aims to solve the problems of high development and utilization cost, large heat loss in a heat exchange link, poor system stability and low continuous heat extraction capacity of a heat exchanger. The heat exchanger comprises an outer pipe, a central pipe and a flow control liquid separator, and the flow control liquid separator is arranged on the central pipe; the central pipe is coaxially arranged in the outer pipe, the outer pipe is divided into an upper section, a middle section and a lower section and sequentially comprises a heat preservation pipe, a conversion pipe and a heat exchange pipe from top to bottom, and the conversion pipe is in a circular truncated cone shape. On the basis of an original straight-up and straight-down inner and outer pipe structure, the outer pipe structure is divided into three sections, the operation flow state of a heat exchange medium is changed, and the heat taking capacity of a single well is improved; the upper heat preservation pipe is externally insulated and internally insulated, downward fluid passes through at a high flow speed, heat exchange between a heat exchange medium and a rock-soil body outside the pipe is prevented, and heat loss is reduced. And in the conversion pipe section and the heat exchange pipe section, the maximum heat exchange with geothermal energy in the stratum temperature increasing section is realized by changing the flow state characteristic of a heat exchange medium and increasing the heat exchange area.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy, and in particular relates to a high-efficiency heat exchanger for mid-deep geothermal energy. Background technique [0002] As a kind of clean energy, geothermal energy is a renewable clean energy that originates from the decay of molten magma and radioactive substances inside the earth and exists in the rock in the form of heat. It is more and more favored by people because of its clean and environmental protection, large reserves and renewable advantages. At present, the middle and deep geothermal energy heating technology used in clean heating is relatively mature, but there are still problems such as high development and utilization costs, large heat loss in heat exchange, poor system stability, and low continuous heat extraction capacity, all of which limit the middle and deep layers. Development and utilization of geothermal energy. [0003] The reason is concentrated on the hea...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-efficiency heat exchanger for mid-deep geothermal energy to solve the problems of high development and utilization costs of the heat exchanger, large heat loss in the heat exchange link, poor system stability, and low continuous heat extraction capacity

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