Thermoelectric helium trigeneration system based on medium-deep geothermal energy ORC power generation

Abstract

The invention provides a thermoelectric helium trigeneration system based on medium-deep geothermal energy ORC power generation. Comprising a modular integrated straight ORC generator set, a heating system, a helium separation pressure storage system, an air cooling / ground cooling composite system and a recharge system. According to the system, a modular integrated direct ORC generator set is adopted, geothermal water directly enters the generator set, an air cooling / geothermal cooling composite cooling cost-reducing and efficiency-increasing technology is arranged, part of heat which is originally lost through an air cooling system is stored underground, cross-seasonal heat storage is achieved, and the energy efficiency and economical efficiency of the system are remarkably improved; and a geothermal helium extraction process system is integrated, so that diversified and efficient utilization of geothermal energy is realized. The system is a poly-generation process technology integrating heat supply, helium extraction and geothermal power generation, and application of geothermal power generation and helium extraction is achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy circulation, and in particular to a thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation. Background Art

[0002] The current mainstream technologies for geothermal power generation are: (1) steam Rankine cycle, (2) flash cycle, (3) organic Rankine cycle, and (4) Kalina cycle power generation system; among them, the organic Rankine cycle is a technology used to convert low-grade thermal energy into electrical energy, especially for medium and low-temperature geothermal resources.

[0003] Among them, (1) Steam Rankine cycle: The advantages are mature technology, simple system, and low investment cost; the disadvantages are high requirements for geothermal fields, few applicable occasions, and heavy corrosion and scaling; it is suitable for steam-type geothermal with high dryness.

[0004] (2) Flash cycle: Advantages are simplicity, reliability, low investment cost, and easy maintenance; disadvantages are large turbine size, easy corrosion and scaling, high energy loss, and low power generation efficiency; it is suitable for steam-type geothermal and high-temperature dry hot rock geothermal;

[0005] (3) Organic Rankine cycle: Advantages include long operating life, low heat source temperature requirements, and wide capacity range; disadvantages include two sets of working fluid cycles, high manufacturing technology requirements, and high investment; it is suitable for medium and low temperature hydrothermal geothermal power generation;

[0006] (4) Kalina cycle power generation system: The advantage is that it has a variable temperature heat absorption and heat release process and better temperature matching; the disadvantage is that it has two sets of working fluid cycles, the system is complex, the investment is high, and the working fluid sealing requirements are high; it is suitable for geothermal power generation with variable working conditions.

[0007] With the continuous improvement of geothermal power generation technology, the geothermal conversion rate will be improved, the geothermal conversion equipment will be optimized, and there will be reports on a system that converts geothermal heat into a three-in-one thermoelectric helium system. Summary of the Invention

[0008] In view of the defects of the prior art such as low utilization rate of geothermal water and large condensation heat (water) loss, the purpose of the present invention is to provide a thermoelectric helium trigeneration system based on medium-deep geothermal energy ORC power generation.

[0009] The technical solutions of the present invention are as follows:

[0010] The present invention relates to a thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation, comprising: a modular integrated direct-flow ORC generator set, a heating system, a helium separation and pressure storage system, an air cooling / ground cooling composite system, and a recharge system;

[0011] Among them, the geothermal wells are regulated by the heating season and are connected to the modular integrated direct-flow ORC generator set and heating system respectively;

[0012] The evaporation side of the modular integrated direct-flow ORC generator set is connected to the heating system and the helium separation and pressure storage system respectively;

[0013] The condensing side of the modular integrated direct-flow ORC generator set is connected to the air-cooling / floor-cooling composite system;

[0014] The helium separation and pressure storage system is connected to the recharging system;

[0015] The recharge system is connected to the recharge well;

[0016] The geothermal wells are connected to modular integrated direct-flow ORC generator sets and heating systems respectively. Non-heating geothermal well water is used to generate electricity through modular integrated direct-flow ORC generator sets. After power generation during the heating season, the geothermal tail water is connected to the heating system to provide heating for residential buildings.

[0017] After power generation or heating, the geothermal tail water is connected to the helium separation and pressure storage system, which is used to collect helium. After the helium is collected, the geothermal tail water is returned to the reinjection well (including reinjection well A and reinjection well B) through the reinjection system; after the geothermal tail water is reinjected into the reinjection well, it is heated through the underground flow field and then connected to the geothermal well, realizing the recycling of geothermal water.

[0018] The modular, integrated direct-entry ORC generator set is connected to a combined air-cooling / floor-cooling system (air cooling system, floor cooling system). The air-cooling / floor cooling system primarily uses tap water as an exchange medium to absorb heat from the generator set's circulating fluid through air or buried boreholes, thereby reducing the circulating fluid temperature and condenser back pressure. Its core function is to ensure thermal balance and efficient operation of the power generation equipment.

[0019] Preferably, the heating system absorbs heat from the geothermal resource dynamic monitoring and allocation system and transmits the power supply heat energy to the modular integrated direct-flow ORC generator set.

[0020] Preferably, the modular integrated direct-flow ORC generator set uses the power supply heat obtained to generate organic steam, which in turn drives the turbine to rotate, drives the generator to generate electricity, and outputs electrical energy.

[0021] The modular, integrated direct-flow ORC generator set is a system that generates electricity using medium- and low-temperature heat sources (such as geothermal energy, industrial waste heat, solar thermal energy, or biomass). Its structure consists of four main components: an evaporator, an expander, a condenser, and a fluid pump. Its features include a compact structure and high integration. The evaporator is made of duplex steel or titanium, depending on the geothermal water quality, allowing direct connection of geothermal water to the generator set. Similar to the traditional steam Rankine cycle, it uses low-boiling-point organic fluids (such as R245fa, pentane, and siloxane) instead of water to accommodate low-temperature heat sources. The evaporator, consisting of a preheater and the evaporator itself, heats the liquid organic fluid into a gas. The expander converts thermal energy into mechanical energy. The condenser condenses the fluid from the gas back into a liquid. The fluid pump pressurizes the liquid fluid and returns it to the preheater and evaporator, completing the cycle.

[0022] Preferably, the helium separation and pressure storage system is connected to a modular integrated direct-flow ORC generator set and a heating system for extracting helium.

[0023] Preferably, the reinjection system is connected to a helium separation and pressure storage system to transport geothermal tail water after being used for power generation or heating to the reinjection well.

[0024] Preferably, the modular integrated direct-flow ORC generator set is connected to an air-cooling / ground-cooling composite system, and the air-cooling system and the ground-cooling system are compositely regulated to reduce the water consumption of the cooling system and increase the cooling efficiency.

[0025] The cogeneration process of the present invention forms a geothermal resource and cogeneration monitoring and control system, realizing the joint operation and dynamic regulation of geothermal wells, power generation systems, heating systems, and helium collection systems.

[0026] Working principle of the present invention:

[0027] The hot water in the geothermal well is transported to the modular integrated direct ORC generator set (which converts low-grade thermal energy into electrical energy) through a geothermal well pump to generate electricity and output power; the geothermal water is indirectly exchanged with the heating system to heat residential buildings; the modular integrated direct ORC generator set and the heating system are regulated and operated to extract helium using the helium separation and pressure storage system connected to the geothermal tail; the geothermal tail water with helium collected is physically purified through the reinjection system, and then passed through the reinjection well. The reinjection well water is connected to the geothermal well through the underground flow field and circulated, thereby forming a highly efficient and renewable recycling of geothermal resources.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The system of the present invention adopts organic Rankine cycle (ORC) power generation technology, using R245a as the working medium, efficiently extracting heat from geothermal water, converting it into high-pressure gas to drive the turbine to rotate, and then drive the generator to generate electricity;

[0030] (2) The system of the present invention adopts a direct heat source approach and adds a key cost-reduction and efficiency-enhancing technology of an air cooling + ground cooling system, which significantly improves the energy efficiency and economy of the system; and incorporates a geothermal helium extraction process system to achieve diversified and efficient utilization of geothermal energy.

[0031] (3) The system of the present invention is a multi-generation process technology that integrates heat supply, helium extraction, and geothermal power generation, realizing the diversified application of geothermal power generation and helium extraction.

[0032] (4) The system of the present invention not only marks the successful implementation of the first geothermal comprehensive development and utilization that integrates residential heating services, medium and low temperature power generation and water-soluble helium extraction, but also represents an important milestone in geothermal development technology innovation and industrial upgrading. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0034] Figure 1 This is a structural schematic diagram of the thermoelectric helium trigeneration system based on medium-deep geothermal energy ORC power generation of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0036] Example

[0037] This embodiment relates to a thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation. Figure 1 As shown, it includes: modular integrated direct-flow ORC generator set, heating system, helium separation and pressure storage system, air cooling / ground cooling composite system, and recharge system;

[0038] Among them, the geothermal wells are regulated by the heating season and are connected to the modular integrated direct-flow ORC generator set and heating system respectively;

[0039] The evaporation side of the modular integrated direct-flow ORC generator set is connected to the heating system and the helium separation and pressure storage system respectively;

[0040] The condensing side of the modular integrated direct-flow ORC generator set is connected to the air-cooling / floor-cooling composite system;

[0041] The helium separation and pressure storage system is connected to the recharging system;

[0042] The recharge system is connected to the recharge well;

[0043] The geothermal wells are connected to the heating system via pipelines, providing heating to residents during the heating season. After heating, the geothermal tailwater is treated in the recharge system and then recharged back into the recharge wells. During the off-season, the geothermal water is connected to a modular, integrated, direct-flow ORC generator set via a controlled bypass pipeline for geothermal power generation. The condenser of the modular, integrated, direct-flow ORC generator set is connected to both the air-cooling system and the ground-cooling system, which stores heat for reuse across seasons.

[0044] The geothermal wells are connected to modular integrated direct-flow ORC generator sets and heating systems respectively. Non-heating geothermal well water is used to generate electricity through modular integrated direct-flow ORC generator sets. After power generation during the heating season, the geothermal tail water is connected to the heating system to provide heating for residential buildings.

[0045] After power generation or heating, the geothermal tail water is connected to the helium separation and pressure storage system, which is used to collect helium. After the helium is collected, the geothermal tail water is returned to the reinjection well (including reinjection well A and reinjection well B) through the reinjection system; after the geothermal tail water is reinjected into the reinjection well, it is heated through the underground flow field and then connected to the geothermal well, realizing the recycling of geothermal water.

[0046] The modular, integrated direct-entry ORC generator set is connected to a combined air-cooling / floor-cooling system (air cooling system, floor cooling system). The air-cooling / floor cooling system primarily uses tap water as an exchange medium to absorb heat from the generator set's circulating fluid through air or buried boreholes, thereby reducing the circulating fluid temperature and condenser back pressure. Its core function is to ensure thermal balance and efficient operation of the power generation equipment.

[0047] Preferably, the geothermal wells are connected in series and parallel with the heating system and the modular integrated direct-flow ORC generator set respectively. The geothermal wells in the middle of the heating season are used for heating residential houses, and the geothermal wells in the early and late heating season and the non-heating season are used to generate electricity and connect to the national grid through the ORC generator set.

[0048] Preferably, the modular integrated direct-flow ORC generator set utilizes geothermal water thermal energy to heat the organic working fluid into a high-pressure gaseous state, generating organic steam, which in turn drives the turbine to rotate, driving the generator to generate electricity and output electrical energy.

[0049] The helium separation and pressure storage system is connected to the modular integrated direct-flow ORC generator set and the heating system for extracting helium.

[0050] The reinjection system is connected to the helium separation and pressure storage system to transport the geothermal tail water after being used for power generation or heating to the reinjection well.

[0051] The modular integrated direct-flow ORC generator set is connected to an air-cooling / ground-cooling composite system, and the air-cooling system and the ground-cooling system are adjusted in a composite manner to reduce the water consumption of the cooling system and increase the cooling efficiency.

[0052] The present invention uses a geothermal well pump to transport hot water in the geothermal well to a modular integrated direct-flow ORC generator set (which converts low-grade thermal energy into electrical energy) to generate electricity and output power; the geothermal water is indirectly exchanged with heat through a heating system to heat residential buildings; the modular integrated direct-flow ORC generator set and the heating system are regulated and operated to extract helium using a helium separation and pressure storage system connected to the geothermal tail; the geothermal tail water with helium collected is physically purified through a reinjection system and then injected into the reinjection well. The reinjection well water is connected and circulated with the geothermal well through an underground flow field, thereby forming a highly efficient and renewable recycling of geothermal resources.

[0053] This system has achieved a breakthrough in extracting water-soluble helium while generating geothermal power. During the heating season, it will also be combined with residential heating services, forming a unique integrated utilization model. The electricity generated by geothermal power generation is successfully sold online, injecting green energy into the local power grid. The extraction and purification of water-soluble helium also generates significant additional revenue for the project.

[0054] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation, characterized by: include: Modular integrated direct-flow ORC generator set, heating system, helium separation and pressure storage system, air cooling / floor cooling composite system, and recharge system; Among them, the geothermal wells are regulated by the heating season and are connected to the modular integrated direct-flow ORC generator set and heating system respectively; The evaporation side of the modular integrated direct-flow ORC generator set is connected to the heating system and the helium separation and pressure storage system respectively; The condensing side of the modular integrated direct-flow ORC generator set is connected to the air-cooling / floor-cooling composite system; The helium separation and pressure storage system is connected to the recharging system; The recharge system is connected to the recharge well.

2. The thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation according to claim 1, characterized in that: The modular integrated direct-flow ORC generator set utilizes geothermal water thermal energy to heat the organic working fluid into a high-pressure gas, thereby driving the steam turbine to rotate, driving the generator to generate electricity, and outputting the electricity to the national grid.

3. The thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation according to claim 1, characterized in that: The helium separation and pressure storage system is connected to the heating system and the modular integrated direct-flow ORC generator set for extracting helium.

4. The thermoelectric helium trigeneration system based on mid-deep geothermal energy ORC power generation according to claim 1, characterized in that: The heating system is used to physically purify the tail water after heating residential buildings through the reinjection system and then reinject it into the reinjection well.

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