Multi-cavity heat insulation flow guide pipe with heat insulation structure and preparation method thereof

Abstract

The invention relates to a multi-cavity heat insulation flow guide pipe with a heat insulation structure and a preparation method thereof, and belongs to the related technical field of heat insulation flow guide. The multi-cavity heat insulation flow guide pipe comprises an outer pipe and an inner pipe, the bottom of the outer pipe is of a sealed structure, and the top and the bottom of the inner pipe are of open structures; a first cavity is formed between the inner pipe and the outer pipe, the middle of the inner pipe is provided with an axially-through second cavity, the inner pipe is arranged in the outer pipe in a sleeved mode, a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area; and a third cavity is formed between the inner side wall and the outer side wall of the inner pipe, the third cavity is a vacuum cavity, and a heat preservation material is sealed in the third cavity. The multi-cavity heat insulation flow guide pipe can be used for a medium-deep geothermal energy utilization system, the comprehensive utilization effects of small occupied area, low geothermal energy loss and zero influence on the ecological environment are achieved, the heating requirements of buildings and agriculture can be met without using high-grade energy for heat compensation, and the maximum utilization efficiency of geothermal energy is achieved.

Description

technical field [0001] The invention relates to the technical field related to heat insulation and flow diversion, in particular to a multi-cavity heat insulation flow diversion pipe with a heat insulation structure and a preparation method thereof. Background technique [0002] At present, conventional geothermal energy utilization generally adopts heat pump systems, which are divided into the following main methods: 1. Utilization of surface water sources, using surface water as a cold and heat source; 2. Utilization of soil sources, using soil energy storage as a cooling 3. Shallow ground energy utilization, a water source heat pump system that uses shallow groundwater as a cold and heat source. These three technical forms are basically shallow or surface ground energy utilization, combined with heat pump technology to form a new energy utilization system. [0003] The existing conventional geothermal energy utilization has the following disadvantages: 1. Utilization of ...

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Problems solved by technology

[0003] The existing conventional geothermal energy utilization has the following disadvantages: 1. Utilization of water that exists on the surface of the earth’s crust and is exposed to the atmosphere, such as river water, river water, lake water, reservoir water, etc., has relatively large constraints on the location of utilization; extract hot water and discharge it into cold water It will cause the temperature of the local water body to rise or fall, which will affect the distribution of the temperature field of the water body in a specific area, and then cause certain pollution to the water environment.

The temperature of the hydrothermal resources existing on the surface is relatively low, and the traditional diversion pipe has a large heat loss, so the heat utilization value of the surface water source system is low, and other energy sources are needed to assist the work

2. The heat energy temperature of the shallow soil is low, so in order to provide a certain amount of heat energy, a large area of ​​pipelines needs to be buried; the soil source heat pump occupies a large area, the amount of engineering is large, the investment is large and the benefit is low; the heating process will lead to regional thermal imbalance; The shallow soil temperature is relatively low, and the traditional diversion pipe has a large heat loss, so the heat utilization value of the surface water source system is low, and other energy sources are required to assist the work

3. Due to the limitation of underground heat resources, the application is limited; most of them use extraction, extraction, and recharge methods. It is an open system for the utilization of groundwater sources. The utilization rate is not high, and it will cause the problem of groundwater oxidation and affect the underground ecology. environment, it is easy to cause pollution of groundwater resources; due to the inability to achieve complete recharge of groundwater, the amount of water collected is greater than the amount of recharge, causing problems such as land subsidence; the temperature of shallow groundwater cannot meet the requirements of domestic hot water, and the traditional diversion pipe has a large heat loss, so the heat utilization value of the surface water source system is low, and other energy sources are required for auxiliary work

Generally, only the pipes in the permafrost layer are insulated and wrapped, but in fact, geothermal heat gradually cools down from deep to shallow, and the heat loss continues during the lifting process of deep geothermal heat below the permafrost layer.

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