A closed circulation heating system

Abstract

A closed circulation heating system comprises a liquid storage tank and a circulation water tank communicated with the liquid storage tank. An electric heating pipe is arranged in the circulation water tank, the circulation water tank is communicated with a plurality of horizontal branched boreholes through a central main borehole, a heat insulating pipe going down from the central main borehole is arranged in each horizontal branched borehole, inlets of the heat insulating pipes are communicated with the horizontal branched boreholes, outlets of the heat insulating pipes are connected with a heat exchanger and then go back to the circulation water tank, and the heat exchanger and a heating pipe network of users form a circulation loop. Well drilling cost is lowered, heat exchange power is increased, pollution to strata during operating of the system is avoided, the closed circulation heating system belongs to an environmental-friendly system, and the problems of poor stability in system operating and relatively short equipment service life caused by adoption of geothermal water are solved. In addition, the closed circulation heating system is high in applicability, free of limitation of geographical positions and geothermal resources, capable of being established at any place and low in operating expense.

Description

technical field [0001] The invention relates to a geothermal heating system, in particular to a closed circulation heating system. Background technique [0002] Geothermal resources are clean and renewable resources, and have the advantages of easy development, low cost, clean, constant temperature, etc., and have been widely used in heating, bathing, etc. The traditional method of water source heat exchange is to set up multiple geothermal wells on the surface , which are used to collect geothermal heat and recharge respectively. There are some problems in this development and utilization method. Due to the high salinity of geothermal water, the main mineral types are calcium carbonate, silicon dioxide, silicate, etc. Calcium carbonate and silicate The precipitation of silicon oxide is particularly sensitive to the pressure and temperature of the working medium. During the process of power generation or heat exchange and heating, the temperature and pressure of geothermal w...

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Problems solved by technology

[0002] Geothermal resources are clean and renewable resources, and have the advantages of easy development, low cost, clean, constant temperature, etc., and have been widely used in heating, bathing, etc. The traditional method of water source heat exchange is to set up multiple geothermal wells on the surface , which are used to collect geothermal heat and recharge respectively. There are some problems in this development and utilization method. Due to the high salinity of geothermal water, the main mineral types are calcium carbonate, silicon dioxide, silicate, etc. Calcium carbonate and silicate The precipitation of silicon oxide is particularly sensitive to the pressure and temperature of the working medium. During the process of power generation or heat exchange and heating, the temperature and pressure of geothermal water will change greatly, which will affect the solubility of various minerals, resulting in Precipitation and scaling from water will affect the stability of system operation; geothermal fluid also contains some corrosive media (including dissolved oxygen (O 2 ), H + , Cl - 、H 2 S, CO 2 , NH 3 and SO 2 ), coupled with the influence of fluid temperature, flow rate, pressure and other factors, geothermal fluids will corrode various metal surfaces to varying degrees, which directly affects the service life of equipment; in addition, due to this structure, multiple geothermal wells need to be built , not only wastes a lot of manpower and material resources, but also takes up valuable urban space. The traditional geothermal well heating system is also limited by the geographical location of geothermal resources. Geothermal wells cannot be built anywhere.

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