Carbon dioxide hydrate storage heat supply system

Abstract

A carbon dioxide hydrate storage heat supply system is characterized by comprising an injection system, a recovery system, a heat removal system and a user heat exchange system. The injection system comprises an injection well and a fan, and the fan is mounted at a wellhead of the injection well; the recovery system comprises a recovery well and a gas recovery tank communicated with the recovery well, and the gas recovery tank is communicated with the injection well; the heat removal system comprises a circulating pump and a deep-layer heat removal sleeve, the circulating pump is communicated with the deep-layer heat removal sleeve and the heat exchange system, the deep-layer heat removal sleeve is communicated with the heat exchange system, and a flowing medium is injected into the deep-layer heat removal sleeve; the heat exchange system comprises an evaporator, a condenser, a compressor, a liquid storage device and a filter, the evaporator is communicated with the circulating pump, the deep heat removal sleeve and the filter, a refrigerant is contained in the evaporator, the condenser is communicated with the compressor and the liquid storage device, and the liquid storage device is communicated with the filter. After the system is adopted, a user can adopt the heat storage water tank to store heat.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat supply, and specifically points to a carbon dioxide hydrate storage heat supply system. BACKGROUND

[0002] Carbon dioxide is a greenhouse gas, which can radiate long-wave radiation with longer wavelength to the ground after strongly absorbing the ground long-wave radiation, thereby producing greenhouse effect. With the continuous enhancement of greenhouse effect, it will intensify to cause global climate warming, and produce a series of unpredictable global climate problems in today's science. In response to climate change, our country proposes the commitment such as "striving to reach the peak of carbon dioxide emissions before 2030, and striving to realize carbon neutrality before 2060". Under the "double carbon" target, as an important technical approach that can realize large-scale low-carbon utilization of fossil energy, carbon capture, utilization and storage technology has become a research hotspot at present.

[0003] CO2 geological storage is one of the important means to achieve the "double carbon" target, and hydrate-based CO2 storage (HCS) is a new type of CO2 geological storage technology. CO2 hydrate is a kind of envelope compound formed by CO2 guest molecules entering the host cavity composed of water hydrogen bond under certain pressure and temperature conditions. Water molecules combine to form CO2 hydrate under certain temperature and pressure conditions, which has high gas storage density and good mechanical stability, and can realize safe, long-term and stable storage of a large amount of CO2. However, a large amount of heat up to 540 KJ / kg will be released during the generation of CO2 hydrate. If this part of heat is not removed or offset in time, it will affect the reaction synthesis conditions of the hydrate, and reduce the geological storage efficiency of CO2. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of carbon dioxide hydrate storage heat supply system, its main purpose is to overcome the heat generated in the generation of CO2 hydrate It is removed or offset in time.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A kind of carbon dioxide hydrate storage heat supply system includes injection system, recovery system, heat extraction system and user heat exchange system;

[0007] The injection system includes injection well and fan, the fan is installed at the wellhead of injection well, and the CO2 collected by carbon emission industrial source is transported to the wellhead of injection well through pipeline, and the fan is used to transport CO2 to underground porous medium layer through injection well;

[0008] The recovery system comprises a recovery well and a gas recovery tank in communication with the recovery well, the gas recovery tank being in communication with the injection well, the recovery well being used to recover the CO2 discharged due to the change of geological environment and to recover the CO2 to the gas recovery tank, and the gas recovery tank being used to deliver the CO2 to the injection well.

[0009] The heat extraction system comprises a circulating pump and a deep heat extraction casing, the circulating pump being in communication with the deep heat extraction casing and the heat exchange system, the deep heat extraction casing being in communication with the heat exchange system, the deep heat extraction casing being filled with a flow medium, the flow medium being used to absorb the heat generated in the process of synthesizing CO2 hydrate and being delivered to the heat exchange system for heat exchange, and the cooled flow medium being delivered to the deep heat extraction casing for heat exchange circulation.

[0010] The heat exchange system comprises an evaporator, a condenser, a compressor, a liquid storage tank and a filter, the evaporator being in communication with the circulating pump, the deep heat extraction casing and the filter, the evaporator being provided with a refrigerant, the condenser being in communication with the compressor and the liquid storage tank, the liquid storage tank being in communication with the filter, the refrigerant being compressed by the compressor to become gaseous refrigerant with high temperature and high pressure after absorbing the heat from the flow medium in the evaporator, and the gaseous refrigerant releasing heat in the condenser to provide heat for the user end.

[0011] Further, the injection system further comprises a first CO2 detection device arranged between the fan and the wellhead of the injection well.

[0012] Further, the recovery system further comprises a second CO2 detection device, the second CO2 detection device being in communication with the recovery well and the gas recovery tank.

[0013] Further, the deep heat extraction casing comprises a heat extraction outer pipe and a heat extraction inner pipe, the heat extraction inner pipe being sleeved in the heat extraction outer pipe, the heat extraction inner pipe being in communication with the evaporator, the flow medium flowing between the heat extraction outer pipe and the heat extraction inner pipe, and the heat extraction outer pipe being filled with cementing backfill material between the heat extraction outer pipe and the surrounding formation.

[0014] Further, the heat extraction outer pipe is provided with a temperature sensor and a pressure sensor with remote transmission function at the bottom of the outer side of the heat extraction outer pipe.

[0015] As can be known from the description of the utility model, compared with the prior art, the utility model has the following advantages: CO2 collected from carbon emission industrial sources is injected into the porous medium layer of the deep underground geology, so that the CO2 nucleates and crystallizes in the porous medium layer under the conditions of low temperature and high pressure underground, and finally forms CO2 hydrate. A large amount of heat is released during the synthesis of the CO2 hydrate, and the heat is continuously absorbed by the flowing medium in the deep heat extraction casing pipe. The flowing medium is transported to the evaporator by the circulating pump, and then enters the deep heat extraction casing pipe again for circulation after heat exchange. The heat in the flowing medium is finally transported to the user after being absorbed by the refrigerant in the evaporator. The system can be opened all year round, and the user can store heat by using a heat storage tank. The system can be mainly used for heating and domestic water supply in the heating season in winter. The utility model recovers CO2 discharged from the factory by using the CO2 hydrate synthesis technology and stores the CO2 in the geology, and recovers the heat released during the synthesis of the CO2 hydrate. The waste heat can be efficiently recovered to solve the heating demand of residents in winter, and help achieve the double-carbon goal of carbon peak and carbon neutralization of the country. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a system principle diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the deep heat extraction casing pipe of the utility model. DETAILED DESCRIPTION

[0018] Reference Figure 1 A carbon dioxide hydrate storage and heating system comprises an injection system, a recovery system, a heat extraction system and a user heat exchange system.

[0019] The injection system comprises an injection well 1 and a fan 2. The fan 2 is installed at the wellhead of the injection well 1. The CO2 collected from carbon emission industrial sources is transported to the wellhead of the injection well 1 through a pipeline, and the fan 2 is used to transport the CO2 to the underground porous medium layer through the injection well 1. The injection system further comprises a first CO2 detection device 3 arranged between the fan 2 and the wellhead of the injection well 1. The first CO2 detection device 3 is installed on the pipeline, and is used to measure the flow rate, temperature and pressure parameters of the CO2.

[0020] The recovery system comprises a recovery well 4 and a gas recovery tank 5 in communication with the recovery well 4. The gas recovery tank 5 is in communication with the injection well 4. The recovery well 4 is used to recover the CO2 discharged due to changes in the geological environment and recover the CO2 to the gas recovery tank 5 again. The gas recovery tank 5 transports the CO2 to the injection well 1. The recovery system further comprises a second CO2 detection device 6 in communication with the recovery well 4 and the gas recovery tank 5. The second CO2 detection device 6 is used to measure the flow rate, temperature and pressure parameters of the CO2.

[0021] The heat extraction system comprises a circulating pump 7 and a deep heat extraction casing 8, the circulating pump 7 is in communication with the deep heat extraction casing 8 and the heat exchange system, the deep heat extraction casing 8 is in communication with the heat exchange system, the deep heat extraction casing 8 is filled with a flow medium, the flow medium is injected into the deep heat extraction casing 8 to absorb the heat generated in the CO2 hydrate synthesis process, and is transported to the heat exchange system for heat exchange, and the cooled flow medium enters the deep heat extraction casing 7 again for heat exchange circulation.

[0022] The heat exchange system comprises an evaporator 9, a condenser 10, a compressor 11, a liquid reservoir 12 and a filter 13, the evaporator 9 is in communication with the circulating pump 7, the deep heat extraction casing 8 and the filter 13, the evaporator 9 has a refrigerant, the condenser 10 is in communication with the compressor 11 and the liquid reservoir 12, the liquid reservoir 12 is in communication with the filter 13, the refrigerant is compressed by the compressor 11 after absorbing heat from the flow medium in the evaporator 9 to become high-temperature and high-pressure gaseous refrigerant, and the gaseous refrigerant releases heat in the condenser 10 to provide heat for the user end. The liquid reservoir 12 is used to store the refrigerant vapor flowing down from the condenser 10, and the filter 13 can remove suspended solids and particulate matter in the refrigerant vapor, reduce turbidity, and purify the refrigerant vapor.

[0023] Referring to Figure 1 and Figure 2 , the deep heat extraction casing 8 comprises a heat extraction outer pipe 81 and a heat extraction inner pipe 82, the heat extraction inner pipe 82 is sleeved in the heat extraction outer pipe 81, the heat extraction inner pipe 82 is in communication with the evaporator 9, and the flow medium flows between the heat extraction outer pipe 81 and the heat extraction inner pipe 82. After the flow medium flows to the bottom of the heat extraction inner pipe 82, it is transported upward again through the heat extraction inner pipe 82 and transported to the evaporator 9 for heat exchange. The heat extraction outer pipe 81 is filled with cement mortar 83 between the surrounding strata, which is cement mortar, to ensure the contact and heat transfer between the deep heat extraction casing 8 and the surrounding rock. The temperature sensor 84 and the pressure sensor 85 with remote transmission function are arranged at the bottom of the outer side of the heat extraction outer pipe 81, and the temperature sensor 84 and the pressure sensor 85 detect the temperature and pressure of the flow medium, respectively.

[0024] Referring to Figure 1 and Figure 2The utility model discloses a carbon emission industrial source supplement CO2 is transported to the wellhead of injection well 1 through pipeline, utilizes the fan 2 to transport CO2 to the underground porous medium layer through injection well 1, makes CO2 nucleation crystallization in the porous medium layer under the condition of underground low temperature high pressure, finally forms CO2 hydrate, and CO2 hydrate will release a large amount of heat in the synthesis process, and the heat of source and sink will be absorbed by the flowing medium in deep heat extraction casing pipe 8, and the flowing medium is transported to evaporimeter 9 and enters deep heat extraction casing pipe 8 and circulates again after heat exchange, and the heat in the flowing medium is absorbed by the refrigerant in evaporimeter 9 and is compressed into high temperature and high pressure gaseous refrigerant by compressor 11, and the gaseous refrigerant releases heat in condenser 10 and provides heat for user end, and the user can adopt heat storage water tank to store heat, and it can be mainly used for heating and domestic water in winter heating season.

[0025] The above is only the specific implementation manner of the utility model, but the design concept of the utility model does not limit to this, and any non-essential change of the utility model by using the concept should belong to the act of infringing the protection scope of the utility model.

Claims

1. A carbon dioxide hydrate storage heating system, characterized by: The injection system, the recovery system, the heat extraction system and the user heat exchange system are included. The injection system includes an injection well and a fan installed at the wellhead of the injection well. The recovery system includes a recovery well and a gas recovery tank in communication with the recovery well. The heat extraction system includes a circulating pump and a deep heat extraction casing. The heat exchange system includes an evaporator, a condenser, a compressor, a liquid accumulator and a filter.

2. A carbon dioxide hydrate storage heating system as claimed in claim 1, characterized in that: The injection system further includes a first CO2 detection device arranged between the fan and the wellhead of the injection well.

3. A carbon dioxide hydrate storage heating system as defined in claim 1, wherein: The recovery system further includes a second CO2 detection device in communication with the recovery well and the gas recovery tank.

4. A carbon dioxide hydrate storage and heat supply system according to claim 1, characterized in that: The deep heat extraction casing includes a heat extraction outer pipe and a heat extraction inner pipe.

5. A carbon dioxide hydrate storage heating system as claimed in claim 4, characterized in that: The temperature sensor and the pressure sensor with remote transmission function are arranged at the bottom of the outer side of the heat extraction outer pipe.

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