Geothermal heating system based on absorption type large-temperature-difference heat exchange technology

Abstract

The utility model relates to a geothermal heating system based on an absorption type large-temperature-difference heat exchange technology, which comprises a geothermal well, a heating heat user and an absorption type large-temperature-difference heat exchange unit, and the absorption type large-temperature-difference heat exchange unit comprises an absorption type lithium bromide unit and a plate heat exchanger. The absorption type lithium bromide unit comprises a generator, an absorber, a condenser, a first evaporator and a second evaporator, the first evaporator and the second evaporator are independent of each other, and geothermal water pumped out of the geothermal well through the geothermal water circulating pump sequentially enters the generator, the plate heat exchanger and the first evaporator and then is recharged into the geothermal well. Heating heat supply network return water pumped out from a heating heat user through a heat supply network circulating pump is divided into two paths to enter the absorption type large-temperature-difference heat exchange unit, one path sequentially enters the absorber and the condenser, the other path sequentially enters the second evaporator and the plate heat exchanger, and the two paths of heating heat supply network water obtained after temperature rise are converged into the heating heat user. The geothermal water heating system can further reduce the temperature of geothermal water, increase the temperature difference between supply water and return water of the geothermal water and improve the heating efficiency of the geothermal water.

Description

TECHNICAL FIELD

[0001] The utility model relates to geothermal heating technical field, concretely relates to a geothermal heating system based on absorption type big temperature difference heat exchange technology. BACKGROUND

[0002] With the increasing reduction of non-renewable energy such as coal, oil, natural gas, the energy price is increasingly high. And the combustion of fossil fuels releases a large amount of pollutants, air pollution is increasingly serious. Based on the current situation, using geothermal heating to replace fossil fuel heating is an effective method to reduce pollutant emissions.

[0003] The current geothermal heating generally uses geothermal water and heating hot water to directly exchange heat, and the heat exchange equipment is a plate heat exchanger. Limited by the 30-40 DEG C heating hot water return temperature and the plate heat exchanger end difference, the geothermal water of 65-120 DEG C can only be cooled to 35-45 DEG C, and the utilization of geothermal water heat is limited. Therefore, the geothermal heating system based on absorption type big temperature difference heat exchange technology emerges as the times require, which can further reduce the geothermal water temperature, increase the geothermal water supply and return water temperature difference, and improve the heating efficiency of geothermal water. SUMMARY

[0004] The utility model discloses a geothermal heating system based on absorption type big temperature difference heat exchange technology, increases the geothermal water supply and return water temperature difference, and improves the utilization efficiency of geothermal water.

[0005] The utility model discloses a geothermal heating system based on absorption type big temperature difference heat exchange technology, increases the geothermal water supply and return water temperature difference, and improves the utilization efficiency of geothermal water.

[0006] A geothermal heating system based on absorption type big temperature difference heat exchange technology, including geothermal well, heating hot user and absorption type big temperature difference heat exchange unit, absorption type big temperature difference heat exchange unit includes absorption type lithium bromide unit and plate heat exchanger, the absorption type lithium bromide unit includes generator, absorber, condenser, first evaporator and second evaporator that are independent of each other, and the geothermal water that is extracted from geothermal well is entered generator, plate heat exchanger and first evaporator in proper order through geothermal water circulating pump and then is recharged to geothermal well, and the heating hot water return that is extracted from heating hot user is divided into two ways and enters absorption type big temperature difference heat exchange unit, one way enters absorber and condenser in proper order, and the other way enters second evaporator and plate heat exchanger in proper order, and the two-way heating hot water that is obtained after temperature rise is converged into heating hot user.

[0007] Preferably, the geothermal water circulating pump is arranged on the outlet pipeline of the geothermal well.

[0008] Preferably, the heat network circulating pump is arranged on the outlet pipeline of the heating hot user.

[0009] Preferably, the geothermal water from the geothermal well releases heat after driving the lithium bromide absorption heat pump unit, and then enters the plate heat exchanger to exchange heat and cool down, and the cooled geothermal water enters the first evaporator of the lithium bromide absorption heat pump unit to cool down to 10-25 DEG C.

[0010] Preferably, the heating water with a temperature of 40-65 DEG C generated by the absorption large-temperature-difference unit is used to supply heating users, and after the heating water releases heat in the heating users, the temperature of the heating water is reduced, the heat of the heating water is transferred to the heating users, and the cooled heating water becomes heating network return water and enters the absorption large-temperature-difference unit to be reheated by the heat network circulating pump.

[0011] The utility model has the advantages of:

[0012] The heat of the geothermal water from the geothermal well is fully utilized, and the temperature of the geothermal water from the geothermal well can be reduced to 10-25 DEG C.

[0013] The heat of the geothermal water from the geothermal well is fully utilized, and the temperature of the geothermal water from the geothermal well can be reduced to 10-25 DEG C.

[0014] The temperature difference between the supply water and the return water of the geothermal well is increased, the circulation flow of the geothermal water from the geothermal well is reduced under the same heating load, and the operation cost of heating is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model relates to a geothermal heating system based on absorption large-temperature-difference heat exchange technology.

[0016] Wherein: geothermal well 1;Heating user 2;Absorption lithium bromide unit 3;Generator 3.1;Absorber 3.2;Condenser 3.3;First evaporator 3.4;Second evaporator 3.5;Plate heat exchanger 4;Geothermal water circulating pump 5;Heat network circulating pump 6. DETAILED DESCRIPTION

[0017] Reference Figure 1The utility model relates to a kind of geothermal heating system based on absorption large temperature difference heat exchange technology, including geothermal well 1, heating hot user 2 and absorption large temperature difference heat exchange unit, absorption large temperature difference heat exchange unit includes absorption lithium bromide unit 3 and plate heat exchanger 4, the absorption lithium bromide unit 3 includes generator 3.1, absorber 3.2, condenser 3.3, first evaporator 3.4 and second evaporator 3.5 independent of each other, geothermal water extracted from geothermal well 1 by geothermal water circulating pump 5 enters generator 3.1, plate heat exchanger 3.2 and first evaporator 3.4 in turn and then recharges to geothermal well 1, heating hot net return water extracted from heating hot user 2 by heat net circulating pump 6 enters absorption large temperature difference heat exchange unit in two ways, one enters absorber 3.2 and condenser 3.3 in turn, the other enters second evaporator 3.5 and plate heat exchanger 4 in turn, and two routes of heating hot net water obtained after temperature rise converge in heating hot user 2.

[0018] The geothermal well 1, generator 3.1, plate heat exchanger 3.2 and first evaporator 3.4 are connected in sequence by pipelines to form a geothermal water circulation loop. The geothermal water circulating pump is arranged on the outlet pipeline of the geothermal well to provide circulating power for the geothermal water.

[0019] The geothermal water circulates as follows:

[0020] The geothermal water in the geothermal well enters the absorption large temperature difference heat exchange unit under the action of the geothermal water circulating pump, and is recharged to the geothermal well after being cooled multiple times to 10-25℃.

[0021] The heating hot user 2, absorber 3.2, condenser 3.3, second evaporator 3.5 and plate heat exchanger 4 are connected in sequence by pipelines to form a heating hot net water circulation loop, and the heat net circulating pump is arranged on the outlet pipeline of the heating hot user.

[0022] The heating hot net water circulates as follows:

[0023] The heating water with a temperature of 40-65℃ generated by the absorption large temperature difference unit is used to supply the heating hot user, and the heating water temperature decreases after releasing heat in the heating hot user, so that the heating water heat is transferred to the heating hot user, and the cooling heating water becomes heating hot net return water, which enters the absorption large temperature difference unit for reheat through the heat net circulating pump, so as to realize the heat net water circulation.

[0024] Working principle:

[0025] The geothermal water with a temperature of 65-120℃ is first used as a driving heat source of the lithium bromide absorption heat pump unit to release heat, and then enters the plate heat exchanger for heat exchange and cooling, and the geothermal water after being cooled again enters the first evaporator of the lithium bromide absorption heat pump unit to be cooled to 10-25℃.

[0026] The heating network return water at 30-40 DEG C enters the lithium bromide absorption heat pump unit in two ways, the first way of heating network return water enters the absorber and the condenser of the lithium bromide absorption heat pump unit in turn to absorb heat and warm up, the second way of heating network return water enters the second evaporator of the lithium bromide absorption heat pump unit to release heat and then enters the plate heat exchanger to exchange heat with the geothermal water and warm up, and the two ways of heating network return water are mixed to become 40-65 DEG C heating network supply water and supplied out.

[0027] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by using equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claim.

Claims

1. A geothermal heating system based on absorption large temperature difference heat exchange technology, comprising a geothermal well, a heating heat user and an absorption large temperature difference heat exchange unit, the absorption large temperature difference heat exchange unit comprising an absorption lithium bromide unit and a plate heat exchanger, the absorption lithium bromide unit comprising a generator, an absorber, a condenser, a first evaporator and a second evaporator independent of each other, characterized in that: The geothermal water pumped out from the geothermal well by the geothermal water circulating pump enters the generator, the plate heat exchanger and the first evaporator in turn and is then recharged into the geothermal well, and the heating network return water pumped out from the heating users by the heating network circulating pump enters the absorption large-temperature-difference heat exchange unit in two ways, one of which enters the absorber and the condenser in turn and the other of which enters the second evaporator and the plate heat exchanger in turn, and the two ways of heating network water obtained after being warmed up are merged into the heating users.

2. The geothermal heating system based on the absorption-based large temperature difference heat exchange technology according to claim 1, characterized in that: The geothermal water circulating pump is arranged on the water outlet pipeline of the geothermal well.

3. The geothermal heating system based on absorption-based large temperature difference heat exchange technology according to claim 1, characterized in that: The heating network circulating pump is arranged on the water outlet pipeline of the heating users.

4. The geothermal heating system based on the absorption-based large temperature difference heat exchange technology according to claim 1, characterized in that: After the geothermal water pumped out from the geothermal well releases heat as the driving heat source of the lithium bromide absorption heat pump unit, the geothermal water enters the plate heat exchanger to exchange heat and be cooled down, and the geothermal water cooled down again enters the first evaporator of the lithium bromide absorption heat pump unit to be cooled down to 10-25℃.

5. The geothermal heating system based on absorption-based large temperature difference heat exchange technology according to claim 1, characterized in that: The heating water with a temperature of 40-65℃ generated by the absorption large-temperature-difference heat exchange unit is used to supply the heating users, the temperature of the heating water is lowered after the heating water releases heat in the heating users, the heat of the heating water is transferred to the heating users, and the heating water cooled down becomes the heating network return water which enters the absorption large-temperature-difference heat exchange unit to be re-exchanged by the heating network circulating pump.

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