Geothermal energy usage and application scope -3|Heat pump|heating pump|geothermal ground heat pump|source heat pump|central heating pump|heating air conditioning|water heater

Geothermal energy usage and application scope -3

Regarding the geothermal power generation, if geothermal resource’s temperature is high enough, uses its good way is generates electricity. Sends out the electricity already may supply the public electrical network, may also provide the power for the local industry processing. In the normal condition, it uses in the basic load electricity generation, only in the peculiar circumstance, only then uses in the peak value load electricity generation. Its reason; first, is quite difficult to the peak value load’s control, is again vessel’s scaling and the corrosion question, once in the vessel and turbine’s liquid discontented and lets the air enter, will present the scaling and the corrosion question. Geothermal energy is also kind of energy to supply geothermal heat pump for house heating.

Summarizes above, the geothermal energy use plays the influential role in the following four aspects.

1. geothermal power generation

The geothermal power generation is the geothermy use most important way. The high temperature geothermal fluid should first apply in the electricity generation. The geothermal heating power generation and thermoelectricity generation’s principle is the same, is becomes the mechanical energy using the steam heat energy in the steam turbine relay, then leads the generator electricity generation. What is different, the geothermal power generation does not look like thermoelectricity generation such to have the huge boiler, also does not need to consume the fuel, it uses the energy is a geothermal energy. Geothermal power generation’s process, is first transforms the underground heat energy into the mechanical energy, then transforms again the mechanical energy into the electrical energy process. Must use the underground heat energy, first needs to have “the heat-carrying agent” to come up the underground heat energy belt to the ground. At present can by the geothermal power station use heat-carrying agent, mainly be the underground natural steam and the hot water. According to the heat-carrying agent type, the temperature, the pressure and other characteristic difference, may divide the geothermal power generation way into the steam geothermal power generation and the hot water geothermal power generation two broad headings.

(1) steam geothermal power generation

　The steam geothermal power generation is receives and instructs straight the steam Tanaka’s dry steam the person turboset electricity generation, but before directing the person power set should the rock debris which and the waterdrop contains the steam in separates. This electricity generation way is simplest, but does the steam geothermal resource to be very limited, and saves Yu Jiaoshen the stratum, the mining technology difficulty is big, therefore develops is restricted (to refer to “Resources” column relevant paper). Mainly has the back pressure type and the condensation type two kind of generating systems.

(2) hot water geothermal power generation

　The hot water geothermal power generation is the geothermal power generation fundamental mode. At present the hot water geothermal power station has two kind of circulatory systems: a, flash vaporization system. Flash vaporization system as shown in Figure 1. When the high-pressured hot water from the hot well pulls out to the ground, can seethe with excitement and “the flash vaporization” in the pressure drop partial hot water becomes the steam, the steam delivers to the steam turbine acting; But after separating the hot water may continue using the back row to leave, certainly should better be again the reinjection person stratum. b, dual cycle system. Dual cycle system’s flow as shown in Figure 2. The hot water first flows through the heat interchanger, passes to another kind of low boiling point the geothermal energy the operating fluid, causes it ebullition to produce the steam. The steam enters the person steam turbine acting less advanced person water recovery condenser, completes the electricity generation circulation again through the heat interchanger. Hot water from heat interchanger reinjection person stratum. This kind of system especially qualify is big in the salt content, corrosiveness strong and does not congeal the gas content high geothermal resource. The development dual cycle system’s key technologies is the development highly effective heat interchanger.

How is geothermal power generation’s prospect is decided by develops the use geothermy reserves big dry heat crag resources. Figure 3 is uses the dry heat crag electricity generation the schematic drawing. Whether is its key technologies hits the deep well in the person hot rock layer. American New Mexico’s Lowes the Alamo scientific test chamber is carrying on the prospect experiment to this system.