A methanol-based carbon-neutral interregional cogeneration system

Abstract

This disclosure provides a methanol-based carbon-neutral cross-regional cogeneration system. The system includes a new energy power generation methanol production module and multiple energy stations located in different geographical locations. The new energy power generation methanol production module includes a new energy power generation unit, a water electrolysis hydrogen production unit, and a methanol synthesis unit connected in sequence. Each energy station includes a methanol storage tank and a methanol combustion cogeneration module connected to the storage tank. Methanol synthesized by the methanol synthesis unit is transported to the corresponding methanol storage tank via a transport device. The methanol combustion cogeneration module receives the methanol from the storage tank and generates electricity and heat through combustion, transferring the carbon dioxide produced by combustion to the methanol synthesis unit for methanol synthesis. This system enables the "spatiotemporal translation" and "form conversion" of energy, and completes a closed-loop flow of carbon elements by recovering and utilizing carbon dioxide from the combustion products.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of energy technology, specifically relating to a methanol-based carbon-neutral interregional cogeneration system. Background Technology

[0002] Traditional coal-fired combined heat and power (CHP) units have long played a dominant role in my country's urban heating system. However, their combustion of fossil fuels generates large amounts of carbon dioxide and pollutants, resulting in high carbon emission intensity and a heavy environmental burden, which is inconsistent with the national strategic goal of "carbon peaking and carbon neutrality." Currently, a large number of operating coal-fired power units are small and medium-capacity, generally suffering from low thermal efficiency, poor adjustability, and high pollution control costs. According to the clean energy transition plan, these units will be gradually shut down or phased out in the coming years. Their withdrawal will inevitably increase the pressure on regional winter heating and industrial steam supply. How to fill the heating gap left by the shutdown of small and medium-sized coal-fired CHP units has become a critical issue that urgently needs to be addressed.

[0003] Replacing shut-down small and medium-sized coal-fired power units with renewable energy is a feasible solution. However, there is a significant spatial and temporal mismatch between renewable energy and consumption in my country. Spatially, my country's renewable energy resources exhibit significant regional differences: the Northwest region possesses abundant solar and wind energy resources, with enormous potential for renewable energy development; while energy consumption demand is mainly concentrated in the eastern and southern coastal areas, forming a spatially separated development pattern of "energy-rich areas" and "high-load consumption areas." Large-scale renewable energy capacity, if it cannot be transmitted and flexibly allocated across regions, will struggle to support the clean transformation of the power and heat systems. Temporally, renewable energy sources such as wind and solar power are periodic, intermittent, and fluctuating, with significant differences in the temporal distribution between their power generation and end-user heat and power demand, leading to a mismatch problem of "no one using the surplus energy and insufficient supply during peak demand." Without effective time regulation and cross-regional coordination mechanisms, relying solely on local renewable energy sources will make it difficult to achieve stable heating and continuous energy supply. Summary of the Invention

[0004] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a methanol-based carbon-neutral cross-regional cogeneration system.

[0005] The embodiments of this disclosure provide a methanol-based carbon-neutral cross-regional cogeneration system, the system including a new energy power generation methanol production module and multiple energy sites located in different geographical locations; The new energy power generation methanol production module includes a new energy power generation unit, an electrolysis water hydrogen production unit, and a methanol synthesis unit connected in sequence. The new energy power generation unit is used to provide power to the electrolysis water hydrogen production unit, and the electrolysis water hydrogen production unit is used to receive the power and external water to electrolyze water to produce hydrogen. The hydrogen is then transferred to the methanol synthesis unit to synthesize methanol. Each of the energy stations includes a methanol storage tank and a methanol combustion cogeneration module connected to the methanol storage tank; wherein, The methanol synthesized by the methanol synthesis unit is transported to the corresponding methanol storage tanks via a transport device. The methanol combustion cogeneration module is used to receive the methanol in the methanol storage tank and generate electricity and heat through combustion, and to transfer the carbon dioxide generated by combustion to the methanol synthesis unit for methanol synthesis.

[0006] Optionally, the methanol combustion cogeneration module is a supercritical carbon dioxide cycle power generation system driven by methanol combustion; The supercritical carbon dioxide cycle power generation system includes a methanol combustion boiler, a first regenerator, a precooler, and a carbon dioxide turbine, a first generator, and a carbon dioxide compressor arranged coaxially and connected in sequence. The methanol combustion boiler is used to receive methanol combustion and discharge the flue gas after combustion. The first outlet of the methanol combustion boiler is connected to the inlet of the carbon dioxide turbine. The outlet of the carbon dioxide turbine is connected to the first inlet of the first regenerator. The first outlet of the first regenerator is connected to the inlet of the precooler. The outlet of the precooler is connected to the inlet of the carbon dioxide compressor. The outlet of the carbon dioxide compressor is connected to the second inlet of the first regenerator. The second outlet of the first regenerator is connected to the first inlet of the methanol combustion boiler.

[0007] Optionally, the second inlet of the methanol combustion boiler is used to receive methanol, and its second outlet is used to discharge flue gas containing carbon dioxide; the first generator is used to generate electricity, and the precooler is used to output waste heat.

[0008] Optionally, the methanol combustion cogeneration module is a methanol composite working fluid cycle power generation system; The methanol composite working fluid cycle power generation system includes a combustion chamber, a composite working fluid turbine and a second generator arranged coaxially and connected in sequence, and also includes a second regenerator, a cooler, a gas-liquid separator, a first composite working fluid compressor, an intercooler and a second composite working fluid compressor. The combustion chamber is used to receive methanol combustion and generate a composite working fluid to drive the composite working fluid turbine, thereby driving the second generator to generate electricity; the outlet of the composite working fluid turbine is connected to the first inlet of the second regenerator, the first outlet of the second regenerator is connected to the inlet of the cooler, and the outlet of the cooler is connected downstream in sequence to the gas-liquid separator, the first composite working fluid compressor, the intercooler and the second composite working fluid compressor; the outlet of the second composite working fluid compressor is connected to the second inlet of the second regenerator, and the second outlet of the second regenerator is connected to the combustion chamber.

[0009] Optionally, the methanol composite working fluid cycle power generation system further includes a liquid oxygen pump and an air separation unit; The inlet of the liquid oxygen pump is connected to the outlet of the intercooler and the outlet of the air separation unit, respectively. The outlet of the liquid oxygen pump is connected to the third inlet of the second regenerator, and the third outlet of the second regenerator is connected to the combustion chamber.

[0010] Optionally, the cooler and the intercooler are used to output waste heat; the first composite working fluid compressor is used to output carbon dioxide.

[0011] Optionally, the methanol combustion cogeneration module includes a collection device for collecting carbon dioxide produced by combustion and transferring the carbon dioxide to the methanol synthesis unit for methanol synthesis.

[0012] Optionally, the methanol combustion cogeneration module is a methanol combustion-driven Rankine cycle power generation system.

[0013] Optionally, the new energy power generation unit includes at least one of wind power generation devices and photovoltaic power generation devices.

[0014] Optionally, the system further includes an energy dispatch and carbon resource management platform located between the new energy power generation methanol production module and the energy station; The energy dispatch and carbon resource management platform is used to monitor methanol production, reserves, and carbon dioxide recovery rate, and to achieve cross-regional energy optimization and carbon closed-loop operation.

[0015] The methanol-based carbon-neutral interregional combined heat and power system disclosed in this invention can solve the significant spatiotemporal mismatch between renewable energy sources (such as wind and solar power) and energy consumption centers (such as cities and industrial parks), and construct a complete carbon cycle, ultimately achieving the goal of decarbonizing and even achieving carbon neutrality in district heating and power generation. This system realizes the "spatiotemporal translation" and "form conversion" of energy by converting fluctuating renewable energy into methanol, a high-energy-density, easily stored and transportable liquid fuel, and completes the closed-loop flow of carbon elements by recovering and utilizing carbon dioxide from combustion products. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a methanol-based carbon-neutral interregional cogeneration system according to an embodiment of the present disclosure. Figure 2 This is a schematic diagram of the structure of a methanol combustion cogeneration module according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of a methanol combustion cogeneration module according to another embodiment of the present disclosure. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The methanol-based carbon-neutral interregional combined heat and power system disclosed in this invention aims to address the significant spatiotemporal mismatch between renewable energy sources (such as wind and solar power) and energy consumption centers (such as cities and industrial parks), and to construct a complete carbon cycle, ultimately achieving the goal of decarbonizing and even achieving carbon neutrality in district heating and power generation. This system achieves the "spatiotemporal translation" and "form conversion" of energy by converting fluctuating renewable energy into methanol, a high-energy-density, easily stored and transportable liquid fuel. Furthermore, it completes the closed-loop flow of carbon elements by recovering and utilizing carbon dioxide from combustion products.

[0019] The following will refer to the appendix. Figures 1 to 3 The system structure and working principle of the present invention will be described in detail through several specific embodiments.

[0020] Example 1 like Figure 1 As shown, a methanol-based carbon-neutral interregional cogeneration system 100 is disclosed. The system 100 includes a new energy power generation methanol production module 110 and multiple energy stations 120 located in different geographical locations. The new energy power generation methanol production module 110 includes a new energy power generation unit 111, a water electrolysis hydrogen production unit 112, and a methanol synthesis unit 113 connected in sequence. The new energy power generation unit 111 provides electricity to the water electrolysis hydrogen production unit 112, which receives the electricity and external water to electrolyze water to produce hydrogen. This hydrogen is then transferred to the methanol synthesis unit 113 for methanol synthesis.

[0021] Each of the energy stations 120 includes a methanol storage tank 121 and a methanol combustion cogeneration module 122 connected to the methanol storage tank 121. Methanol synthesized by the methanol synthesis unit 113 is transported to the corresponding methanol storage tank 121 via a transport device 130. The methanol combustion cogeneration module 122 receives the methanol in the methanol storage tank 121, generates electricity and heat through combustion, and transfers the carbon dioxide produced by combustion to the methanol synthesis unit 113 for methanol synthesis.

[0022] Specifically, such as Figure 1 As shown in the figure, this embodiment illustrates the basic architecture of a methanol-based carbon-neutral interregional cogeneration system 100. The system 100 mainly comprises two core components: a new energy power generation and methanol production module 110 and energy sites 120 distributed across multiple geographically different locations, such as location 1, location 2, and location 3.

[0023] The new energy power generation methanol production module 110 is typically built in areas rich in wind and solar energy resources but with limited energy absorption capacity, such as northwestern my country. This module comprises three sequentially connected and collaboratively operating units: a new energy power generation unit 111, whose core function is to convert primary energy sources such as wind and solar energy into electrical energy. Specifically, it can consist of a wind power generation device, a photovoltaic power generation device, or a hybrid power generation device combining both. A water electrolysis hydrogen production unit 112 receives green electricity from the new energy power generation unit 111 and uses externally supplied water for electrolysis to continuously produce high-purity hydrogen. A methanol synthesis unit 113 receives hydrogen from the water electrolysis hydrogen production unit 112 and uses carbon dioxide recovered from the energy station 120 as a carbon source. Under the action of a catalyst, liquid methanol is generated through a catalytic synthesis reaction (such as carbon dioxide hydrogenation).

[0024] The energy stations 120 are flexibly located in load centers such as cities, towns, or industrial parks far from renewable energy sources, based on heat and electricity load demands. Each energy station 120 includes: a methanol storage tank 121, used to receive and store liquid methanol transported from the production site by a transport device 130 (such as a tank truck) as a stable fuel reserve; and a methanol combustion cogeneration module 122, whose inlet is connected to the methanol storage tank 121, used to efficiently and cleanly convert the chemical energy in methanol into electrical and heat energy, realizing cogeneration.

[0025] The basic workflow of System 100 is as follows: 1. Energy Conversion and Fixation: The unstable green electricity generated by the new energy power generation unit 111 drives the water electrolysis hydrogen production unit 112 to produce green hydrogen. The green hydrogen combines with the recovered carbon dioxide in the methanol synthesis unit 113 to generate liquid "green methanol". This process completes the conversion from fluctuating renewable energy to a stable chemical energy storage carrier and carbon fixation.

[0026] 2. Energy Transportation: Synthesized liquid methanol is transported across regions at low cost and on a large scale using means such as road tank trucks, from resource-rich areas to stations in various energy-consuming areas.

[0027] 3. Energy Release and Utilization: At energy station 120, the fuel in methanol storage tank 121 is supplied to methanol combustion cogeneration module 122 for combustion, generating high-temperature heat energy. Part of this heat energy is used for power generation, directly supplying the local power grid or users; another part (such as waste heat in the power generation cycle) is extracted through a heat exchanger for district heating or industrial heat use, realizing the cascade utilization of energy.

[0028] 4. Carbon Capture and Recovery: The flue gas produced after methanol combustion is rich in carbon dioxide. System 100 is equipped with a collection device to capture and purify the carbon dioxide to meet the standards for use as a chemical raw material. The captured carbon dioxide can be returned to the methanol synthesis unit 113 of the new energy power generation methanol production module 110 via a transport device 130 (such as a dedicated tank truck) as a carbon source for the synthesis of a new round of methanol, thus forming a closed carbon cycle of "fuel synthesis-combustion-carbon recovery".

[0029] Example 2 like Figure 1 and Figure 2 As shown, the methanol combustion cogeneration module 122 is a supercritical carbon dioxide cycle power generation system driven by methanol combustion. The supercritical carbon dioxide cycle power generation system includes a methanol combustion boiler 127, a first regenerator 128, a precooler 123, and a carbon dioxide turbine 124, a first generator 125, and a carbon dioxide compressor 126 arranged coaxially and connected in sequence.

[0030] The methanol combustion boiler 127 is used to receive methanol combustion and discharge the flue gas after combustion. The first outlet of the methanol combustion boiler 127 is connected to the inlet of the carbon dioxide turbine 124. The outlet of the carbon dioxide turbine 124 is connected to the first inlet of the first regenerator 128. The first outlet of the first regenerator 128 is connected to the inlet of the precooler 123. The outlet of the precooler 123 is connected to the inlet of the carbon dioxide compressor 126. The outlet of the carbon dioxide compressor 126 is connected to the second inlet of the first regenerator 128. The second outlet of the first regenerator 128 is connected to the first inlet of the methanol combustion boiler 127.

[0031] Furthermore, the second inlet of the methanol combustion boiler 127 is used to receive methanol, and its second outlet is used to discharge flue gas containing carbon dioxide. The first generator 125 is used to generate electricity, and the precooler 123 is used to output waste heat.

[0032] refer to Figure 2 This embodiment describes in detail the specific structure and working process of the methanol combustion cogeneration module 122 of the energy station 120 when it adopts a supercritical carbon dioxide cycle power generation system driven by methanol combustion.

[0033] The supercritical carbon dioxide cycle power generation system constitutes a closed thermodynamic cycle loop, including: a methanol combustion boiler 127, a carbon dioxide turbine 124, a first generator 125, a carbon dioxide compressor 126, a precooler 123, and a first regenerator 128. Among them, the carbon dioxide turbine 124, the first generator 125, and the carbon dioxide compressor 126 are typically rigidly coaxially connected, forming the core rotor of the entire cycle.

[0034] The connections of the components are as follows: The methanol combustion boiler 127 has a fuel inlet (second inlet), a combustion product (high-temperature, high-pressure carbon dioxide working fluid) outlet (first outlet), and a flue gas outlet (second outlet). The first outlet of the methanol combustion boiler 127 is connected to the inlet of the carbon dioxide turbine 124. The outlet of the carbon dioxide turbine 124 is connected to the first inlet (high-temperature side inlet) of the first regenerator 128. The first outlet (high-temperature side outlet) of the first regenerator 128 is connected to the inlet of the precooler 123. The outlet of the precooler 123 is connected to the inlet of the carbon dioxide compressor 126.

[0035] The outlet of the carbon dioxide compressor 126 is connected to the second inlet (low-temperature side inlet) of the first regenerator 128. The second outlet (low-temperature side outlet) of the first regenerator 128 is connected back to the working fluid inlet (first inlet) of the methanol combustion boiler 127 to complete the cycle.

[0036] Methanol fuel is transported via pipeline to the fuel inlet (second inlet) of the methanol combustion boiler 127. The ordinary flue gas produced after boiler combustion is discharged from its second outlet and enters the subsequent carbon dioxide collection device.

[0037] The specific work process is as follows: Combustion and Heating: Methanol from methanol storage tank 121 is burned in methanol combustion boiler 127, releasing high-temperature heat. This heat is transferred to the supercritical carbon dioxide working fluid in the circulation loop, causing its temperature and pressure to rise sharply.

[0038] Expansion work and power generation: The high-temperature and high-pressure supercritical carbon dioxide working fluid enters the carbon dioxide turbine 124 and expands, driving the turbine rotor to rotate at high speed. This mechanical work is used to drive the coaxial carbon dioxide compressor 126 to maintain the cycle, and the remaining part (net output power) drives the coaxial first generator 125 to rotate and generate electricity.

[0039] Waste heat recovery and heating: The carbon dioxide working fluid discharged from the carbon dioxide turbine 124 still has a relatively high temperature. It first enters the first regenerator 128, transferring some of its heat to the low-temperature working fluid from the carbon dioxide compressor 126, thus achieving internal heat recovery. Subsequently, the working fluid enters the precooler 123, where it is further cooled by an external cooling medium (such as water). The heat absorbed by the precooler 123 in this process is high-quality waste heat that can be used for district heating.

[0040] Compression and reheat: The cooled carbon dioxide working fluid is compressed to a high pressure state by the carbon dioxide compressor 126, and then enters the low temperature side of the first regenerator 128 to absorb the high temperature heat energy from the exhaust gas of the carbon dioxide turbine 124. After being preheated, it re-enters the methanol combustion boiler 127 for heating and begins the next cycle.

[0041] Carbon capture: The flue gas discharged from the methanol combustion boiler 127 has a high concentration of carbon dioxide, which can be easily captured using mature technologies such as amine absorption. The captured carbon dioxide, after purification, can be returned to the methanol synthesis unit 113 in Example 1.

[0042] Example 3 like Figure 1 and Figure 3 As shown, the methanol combustion cogeneration module 120 is a methanol composite working fluid cycle power generation system. The methanol composite working fluid cycle power generation system includes a combustion chamber 1211, a composite working fluid turbine 1212, and a second generator 1213 arranged coaxially and connected in sequence. It also includes a second regenerator 1214, a cooler 1215, a gas-liquid separator 1216, a first composite working fluid compressor 1217, an intercooler 1218, and a second composite working fluid compressor 1219.

[0043] The combustion chamber 1211 receives methanol combustion and generates a composite working fluid to drive the composite working fluid turbine 1212, thereby driving the second generator 1213 to generate electricity. The outlet of the composite working fluid turbine 1212 is connected to the first inlet of the second regenerator 1214, and the first outlet of the second regenerator 1214 is connected to the inlet of the cooler 1215. Downstream of the outlet of the cooler 1215, the gas-liquid separator 1216, the first composite working fluid compressor 1217, the intercooler 1218, and the second composite working fluid compressor 1219 are sequentially connected. The outlet of the second composite working fluid compressor 1219 is connected to the second inlet of the second regenerator 1214, and the second outlet of the second regenerator 1214 is connected to the combustion chamber 1211.

[0044] Furthermore, the methanol composite working fluid cycle power generation system also includes a liquid oxygen pump 200 and an air separation unit 300. The inlet of the liquid oxygen pump 200 is connected to the outlet of the intercooler 1218 and the outlet of the air separation unit 300, respectively. The outlet of the liquid oxygen pump 200 is connected to the third inlet of the second regenerator 1214, and the third outlet of the second regenerator 1214 is connected to the combustion chamber 1211.

[0045] The cooler 1215 and the intercooler 1218 are used to output waste heat. The first composite working fluid compressor 1217 is used to output carbon dioxide.

[0046] Specifically, such as Figure 1 and Figure 3 As shown, the methanol-gasoline composite refrigerant cycle power generation system is a semi-closed cycle, characterized by the combustion products (mainly carbon dioxide and water vapor) directly serving as the working fluid to drive the turbine. The system includes a combustion chamber 1211, a composite refrigerant turbine 1212, a second generator 1213, a second regenerator 1214, a cooler 1215, a gas-liquid separator 1216, a first composite refrigerant compressor 1217, an intercooler 1218, a second composite refrigerant compressor 1219, and auxiliary liquid oxygen pump 200 and air separation unit 300. The composite refrigerant turbine 1212 is coaxially connected to the second generator 1213.

[0047] The connections of the components are as follows: Combustion chamber 1211 has a fuel (methanol) inlet, an oxidant (oxygen) inlet, and a high-temperature, high-pressure composite working fluid outlet. The outlet of combustion chamber 1211 is connected to the inlet of composite working fluid turbine 1212. The outlet of composite working fluid turbine 1212 is connected to the first inlet (high-temperature side inlet) of second regenerator 1214. The first outlet (high-temperature side outlet) of second regenerator 1214 is connected to the inlet of cooler 1215. The outlet of cooler 1215 is connected to the inlet of gas-liquid separator 1216. The gas phase outlet of gas-liquid separator 1216 is connected to the inlet of first composite working fluid compressor 1217. The outlet of first composite working fluid compressor 1217 is connected to the inlet of intercooler 1218. The outlet of intercooler 1218 is connected to the inlet of second composite working fluid compressor 1219.

[0048] The outlet of the second compound working fluid compressor 1219 is connected to the second inlet (low-temperature side inlet) of the second regenerator 1214. The second outlet (low-temperature side outlet) of the second regenerator 1214 is connected back to the working fluid (recirculated carbon dioxide) inlet of the combustion chamber 1211. Liquid oxygen produced by the air separation unit 300, after being pressurized by the liquid oxygen pump 200, can be injected into the third inlet of the second regenerator 1214 for pre-cooling, and then drawn out from its third outlet. It is then mixed with the recirculated carbon dioxide from the second regenerator 1214 and sent together into the combustion chamber 1211 as an oxidant. Condensate is discharged from the liquid phase outlet of the gas-liquid separator 1216.

[0049] The work process is as follows: 1. Pure Oxygen Combustion: Methanol is combusted with high-purity oxygen from the air separation unit 300 in combustion chamber 1211. Because pure oxygen is used instead of air, the combustion products are mainly carbon dioxide and water vapor, with almost no impurities such as nitrogen oxides, greatly simplifying flue gas treatment.

[0050] 2. Power generation: The generated high-temperature and high-pressure composite working fluid (carbon dioxide and water vapor) directly drives the composite working fluid turbine 1212 to do work, driving the second generator 1213 to generate electricity.

[0051] 3. Cooling and Separation: After initial cooling in the second regenerator 1214, the exhaust gas from the composite working fluid turbine 1212 enters the cooler 1215 for further cooling below the water dew point, causing most of the water vapor to condense. Subsequently, the gas-liquid mixture enters the gas-liquid separator 1216, achieving separation of the gas phase (mainly high-purity carbon dioxide) and the liquid phase (water). The separated water can be supplied as a waste heat source. Both the cooler 1215 and the intercooler 1218 are important waste heat recovery points.

[0052] 4. Carbon Dioxide Compression and Recirculation: A portion of the gaseous carbon dioxide exiting the gas-liquid separator 1216 is output as product gas via the first compound working fluid compressor 1219, where its pressure is already relatively high, facilitating its return to the methanol synthesis unit 113. The remaining portion undergoes multi-stage compression and interstage cooling via the first compound working fluid compressor 1219, intercooler 1218, and second compound working fluid compressor 1219, increasing the pressure to the level required for combustion. The compressed carbon dioxide enters the low-temperature side of the second regenerator 1214, where it is preheated by exhaust gas from the compound working fluid turbine 1212. It then mixes with oxygen and returns to the combustion chamber 1211, serving as a diluent and reactant in the next cycle.

[0053] Example 4 For example, the methanol combustion cogeneration module 122 is a methanol combustion-driven Rankine cycle power generation system. The system 100 also includes an energy dispatching and carbon resource management platform (not shown in the figure) located between the new energy power generation methanol production module 110 and the energy station 120. The energy dispatching and carbon resource management platform is used to monitor methanol production, reserves, and carbon dioxide recovery rate, achieving cross-regional energy optimization and carbon closed-loop operation.

[0054] Specifically, refer to Figure 1 As another feasible implementation, the methanol combustion cogeneration module 122 can also employ a highly mature methanol combustion-driven Rankine cycle power generation system. In this scheme, methanol is burned in a boiler to heat feedwater and generate steam. The steam drives a turbine to generate electricity, and the exhaust steam releases condensation heat in a condenser, which can be used for heating. The flue gas also requires carbon dioxide capture.

[0055] The energy station 120 is preferably designed and arranged in the form of modular integrated units. This "container-type" or "skid-mounted" design facilitates transportation, rapid installation, and capacity expansion. Operators can flexibly increase or decrease the number of deployed modules according to changes in actual heat and electricity load demand in different areas, thereby achieving flexible capacity adjustment and efficient utilization of investment.

[0056] A central energy dispatching and carbon resource management platform can be installed between the new energy power generation methanol production module 110 and multiple energy stations 120. This platform uses technologies such as the Internet of Things and big data to monitor methanol production at each stage, the methanol storage capacity of each station's storage tanks 121, carbon dioxide capture and recovery rates, and local energy demand in real time. Based on this data, the platform can optimize methanol production and distribution plans, coordinate the operational strategies of each station, and ensure that the entire cross-regional system achieves optimal energy matching and carbon closed-loop operation.

[0057] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A carbon neutralized cross-regional combined heat and power system based on methanol, characterized by, The system includes a new energy power generation methanol production module and multiple energy stations located in different geographical locations; The new energy power generation methanol production module includes a new energy power generation unit, an electrolysis water hydrogen production unit, and a methanol synthesis unit connected in sequence. The new energy power generation unit is used to provide power to the electrolysis water hydrogen production unit, and the electrolysis water hydrogen production unit is used to receive the power and external water to electrolyze water to produce hydrogen. The hydrogen is then transferred to the methanol synthesis unit to synthesize methanol. Each of the energy stations includes a methanol storage tank and a methanol combustion cogeneration module connected to the methanol storage tank; wherein, The methanol synthesized by the methanol synthesis unit is transported to the corresponding methanol storage tanks via a transport device. The methanol combustion cogeneration module is used to receive the methanol in the methanol storage tank and generate electricity and heat through combustion, and to transfer the carbon dioxide generated by combustion to the methanol synthesis unit for methanol synthesis.

2. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 1, characterized in that, The methanol combustion cogeneration module is a supercritical carbon dioxide cycle power generation system driven by methanol combustion. The supercritical carbon dioxide cycle power generation system includes a methanol combustion boiler, a first regenerator, a precooler, and a carbon dioxide turbine, a first generator, and a carbon dioxide compressor arranged coaxially and connected in sequence. The methanol combustion boiler is used to receive methanol combustion and discharge the flue gas after combustion. The first outlet of the methanol combustion boiler is connected to the inlet of the carbon dioxide turbine. The outlet of the carbon dioxide turbine is connected to the first inlet of the first regenerator. The first outlet of the first regenerator is connected to the inlet of the precooler. The outlet of the precooler is connected to the inlet of the carbon dioxide compressor. The outlet of the carbon dioxide compressor is connected to the second inlet of the first regenerator. The second outlet of the first regenerator is connected to the first inlet of the methanol combustion boiler.

3. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 2, characterized in that, The second inlet of the methanol combustion boiler is used to receive methanol, and its second outlet is used to discharge flue gas containing carbon dioxide; the first generator is used to generate electricity, and the precooler is used to output waste heat.

4. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 1, characterized in that, The methanol combustion cogeneration module is a methanol composite working fluid cycle power generation system. The methanol composite working fluid cycle power generation system includes a combustion chamber, a composite working fluid turbine and a second generator arranged coaxially and connected in sequence, and also includes a second regenerator, a cooler, a gas-liquid separator, a first composite working fluid compressor, an intercooler and a second composite working fluid compressor. The combustion chamber is used to receive methanol combustion and generate a composite working fluid to drive the composite working fluid turbine, thereby driving the second generator to generate electricity; the outlet of the composite working fluid turbine is connected to the first inlet of the second regenerator, the first outlet of the second regenerator is connected to the inlet of the cooler, and the outlet of the cooler is connected downstream in sequence to the gas-liquid separator, the first composite working fluid compressor, the intercooler and the second composite working fluid compressor; the outlet of the second composite working fluid compressor is connected to the second inlet of the second regenerator, and the second outlet of the second regenerator is connected to the combustion chamber.

5. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 4, characterized in that, The methanol composite working fluid cycle power generation system also includes a liquid oxygen pump and an air separation unit. The inlet of the liquid oxygen pump is connected to the outlet of the intercooler and the outlet of the air separation unit, respectively. The outlet of the liquid oxygen pump is connected to the third inlet of the second regenerator, and the third outlet of the second regenerator is connected to the combustion chamber.

6. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 4, characterized in that, The cooler and the intercooler are used to output waste heat; the first composite working fluid compressor is used to output carbon dioxide.

7. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to any one of claims 1 to 6, characterized in that, The methanol combustion cogeneration module includes a collection device for collecting carbon dioxide produced by combustion and transferring the carbon dioxide to the methanol synthesis unit for methanol synthesis.

8. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to claim 1, characterized in that, The methanol combustion cogeneration module is a methanol combustion-driven Rankine cycle power generation system.

9. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to any one of claims 1 to 6, characterized in that, The new energy power generation unit includes at least one of wind power generation devices and photovoltaic power generation devices.

10. The carbon neutralized, cross-regional, combined heat and power system based on methanol according to any one of claims 1 to 6, characterized in that, The system also includes an energy dispatch and carbon resource management platform set between the new energy power generation methanol production module and the energy station; The energy dispatch and carbon resource management platform is used to monitor methanol production, reserves, and carbon dioxide recovery rate, and to achieve cross-regional energy optimization and carbon closed-loop operation.

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