Methanol online cracking reforming coupling waste heat deep recovery synergistic system

Abstract

This invention relates to a methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system, belonging to the field of combustion system and comprehensive energy utilization technology. It includes a cracking system, a reforming system, and a combustion power system. The cracking system includes a first evaporator and a cracker, with the cracker filled with a methanol cracking catalyst. The reforming system includes a reformer and a second evaporator. This invention utilizes medium-high temperature exhaust gas to heat the first evaporator, cracker, reformer, and second evaporator. Methanol vapor reacts with the methanol cracking catalyst upon heating to generate hydrogen-rich syngas. The methanol aqueous solution is then heated and evaporated into a gaseous methanol aqueous solution. This gaseous methanol aqueous solution undergoes a reforming reaction in the reformer to generate hydrogen-rich syngas, which is then returned to the combustion power system for re-combustion. This maximizes the recovery and utilization of heat from the medium-high temperature exhaust gas, improving the efficiency of deep recovery and utilization of medium-high temperature exhaust gas and upgrading its energy grade.

Description

Technical Field

[0001] This invention belongs to the field of combustion systems and comprehensive energy utilization technology, specifically relating to a methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system. Background Technology

[0002] In current energy utilization equipment centered on heat engines such as internal combustion engines and gas turbines, the overall thermal efficiency is limited by the constraints of the basic thermodynamic cycle. Since fuel combustion is a crucial process, the chemical energy released during combustion is not fully converted into usable work. A considerable portion of this chemical energy is dissipated as heat; for example, high-temperature exhaust gas containing heat is directly released into the atmosphere. This heat in the exhaust gas is not effectively recovered and utilized, which is the key factor limiting the energy utilization efficiency of current heat engines.

[0003] Therefore, how to effectively recover the uranium contained in the high-temperature exhaust gas and convert it into high-grade energy that the system can directly utilize has become a core technical problem that urgently needs to be solved in this field.

[0004] Currently, the main methods for recovering and utilizing heat from the aforementioned high-temperature exhaust gas include: directly utilizing the heat in the high-temperature exhaust gas and absorbing the heat from the high-temperature exhaust gas. Directly utilizing the heat in the high-temperature exhaust gas employs a cascaded recovery method to improve the system's energy utilization efficiency. For example, patent document CN117449927A discloses a methanol-gas turbine combined power generation system and method. This system combines methanol fuel, supercritical CO2, and an organic Rankine cycle, and significantly improves the waste heat utilization efficiency and overall power generation efficiency of the gas turbine exhaust gas by employing a cascaded waste heat recovery method. Patent document CN116006326A discloses a combined cycle coupled compressed air heat storage and peak-shaving system and method, which utilizes methanol, molten salt, supercritical CO2, and an organic Rankine cycle to synergistically constitute a power generation system, and similarly employs a cascaded waste heat recovery method to improve the overall energy utilization efficiency of the system.

[0005] Absorbing heat from high-temperature exhaust gas involves chemical reactions that convert the heat into high-grade chemical energy that can be recombustibly, thereby improving the system's energy utilization efficiency. For example, patent document CN101191084A discloses a method and system for combined heat and power generation using the sensible heat of coal gasification via methane reforming. The high temperature generated during coal gasification provides energy for the methane reforming reaction, and the resulting syngas is used in downstream chemical synthesis or gas turbine power generation. Patent document CN112082392A discloses a kiln heating method and device that uses electrically heated heat transfer oil to crack methanol. The resulting syngas is used as an alternative fuel, while simultaneously recovering heat from the exhaust gas to improve overall energy efficiency.

[0006] However, the first type of system, which directly utilizes heat from high-temperature exhaust gas through cascade recovery, is typically structurally complex. This not only presents challenges in integration and requires significant investment, but also makes it difficult to control the temperature differences between stages, resulting in poor system response and weak dynamic load regulation capabilities. Furthermore, while cascaded waste heat utilization can maximize waste heat recovery, this process is essentially pure heat transfer. It can only slow down the rate of energy grade reduction, but cannot reverse the trend. The continuous decrease in the system's total energy value is a typical loss process, leading to low system recovery efficiency.

[0007] The second method, which uses chemical reactions to absorb heat from high-temperature exhaust gas, requires adding a chemical reheat function to the existing energy utilization system. This increases the complexity of the energy system, leading to higher maintenance costs and initial investment. More importantly, some gaseous hydrocarbon reforming reactions require high activation energy, needing heat source temperatures above 850°C. This limits this heat recovery and utilization method to specific industrial processes with ultra-high-temperature waste heat, such as coal gasification, and cannot be matched with heat sources with medium-to-high-temperature waste heat, such as the exhaust gas from gas turbines and internal combustion engines. Furthermore, during the heat absorption process through chemical reactions, the conversion rate of the reactants is influenced by the exhaust gas temperature and the catalyst used. Too low a temperature results in a low conversion rate, while too high a temperature can cause catalyst poisoning, leading to carbon buildup in hydrocarbons and damaging the equipment. This means that only a portion of the heat from the high-temperature exhaust gas can be recovered through chemical reactions.

[0008] In summary, existing methods for heat recovery and utilization of medium- and high-temperature exhaust gas have certain limitations and shortcomings, resulting in poor effectiveness in deep recovery and utilization and energy grade upgrading of medium- and high-temperature exhaust gas. Summary of the Invention

[0009] In view of this, the present invention provides a methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system to overcome the shortcomings of the prior art. The present invention recovers and utilizes the heat of the medium and high temperature exhaust gas throughout the entire temperature range as much as possible, and efficiently converts low-grade heat into high-grade chemical substances in hydrogen-rich syngas, thereby improving the effect of deep recovery and utilization and energy grade upgrading of medium and high temperature exhaust gas.

[0010] The technical solution of this invention is: a methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system, comprising a cracking system, a reforming system, and a combustion power system. Fuel is input into the combustion power system for combustion, releasing heat energy and emitting medium-to-high temperature exhaust gas containing heat. The cracking system includes a first evaporator and a cracker, which are connected to the first evaporator and the combustion power system via pipelines. The cracker is filled with a methanol cracking catalyst. The medium-to-high temperature exhaust gas containing heat emitted from the combustion power system flows sequentially through the cracker and the first evaporator via pipelines and is then discharged. Liquid methanol is input into the first evaporator for heating and evaporation. The methanol vapor enters the cracker and undergoes a cracking reaction to generate hydrogen-rich synthesis gas. The reforming system includes a reformer and a second evaporator. The reformer is connected to the first evaporator and the second evaporator through pipelines. The low-temperature exhaust gas containing heat discharged from the first evaporator flows through the reformer and the second evaporator in sequence through pipelines. The methanol aqueous solution is fed into the second evaporator and evaporated into a gaseous methanol aqueous solution. The gaseous methanol aqueous solution enters the reformer and undergoes a reforming reaction to generate hydrogen-rich synthesis gas. The hydrogen-rich synthesis gas generated in the reformer and cracker is fed into the combustion power system through pipelines for combustion.

[0011] Preferably, it also includes: a methanol synthesis gas separation system, which is located between the cracking system, the reforming system and the combustion power system. The hydrogen-rich synthesis gas generated by the reformer and the cracker is input into the methanol synthesis gas separation system to separate the uncracked and reformed methanol gas from the hydrogen-rich synthesis gas, and then the hydrogen-rich synthesis gas is input into the combustion power system.

[0012] Preferably, the methanol synthesis gas separation system includes a separator, a fifth control valve, and a sixth control valve. The separator is connected to the pyrolysis system, the reforming system, and the combustion power system via pipelines. One end of the fifth control valve and the sixth control valve are connected to the separator, and the other end is connected to the pyrolysis system and the reforming system, respectively, so that the separated methanol gas can be subjected to pyrolysis and reforming reactions again.

[0013] Preferably, the separator is connected to a methanol-water solution storage tank via a pipeline, and a seventh control valve and a condenser are sequentially installed on the pipeline along the methanol gas flow direction to condense the separated methanol gas. The methanol-water solution storage tank is connected to a second evaporator via a pipeline, and a second booster pump is installed on the pipeline to input the methanol-water solution into the second evaporator.

[0014] Preferably, a fuel quality sensor is installed on the pipeline between the separator and the combustion power system to collect the Wobbe number information of the hydrogen-rich synthesis gas input to the combustion power system. The first evaporator is connected to the input port of the eighth control valve through a pipeline, and its output port is connected to the pipeline between the separator and the fuel quality sensor through a pipeline.

[0015] Preferably, a mixer is installed on the pipeline between the separator and the fuel quality sensor, and the mixer is connected to the output port of the eighth control valve.

[0016] Preferably, the first evaporator is connected to a liquid methanol storage tank via a pipeline, and a first booster pump is installed on the pipeline to input liquid methanol into the first evaporator.

[0017] Preferably, the combustion power system is one of a gas turbine, an internal combustion engine, and a boiler. The combustion chamber of the gas turbine, internal combustion engine, or boiler is connected to the pyrolysis system and the reforming system in sequence through pipelines, so that the exhaust gas containing heat at medium and high temperatures flows sequentially through the pyrolyzer, the first evaporator, the reformer, and the second evaporator.

[0018] Preferably, when the combustion power system is an internal combustion engine, the second evaporator is connected to the three-way catalytic converter through a pipe to purify the final exhaust gas output from the second evaporator.

[0019] Preferably, the carbon-hydrogen ratio of the methanol-water solution is in the range of 1:1 to 2.

[0020] Compared with existing technologies, the present invention provides a methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system. This system utilizes a first evaporator and cracker in the cracking system, and a reformer and second evaporator in the reforming system. The combustion power system burns fuel to release heat energy and discharges medium-to-high temperature exhaust gas containing heat. This exhaust gas heats the first evaporator, cracker, reformer, and second evaporator, causing liquid methanol to evaporate into methanol vapor. The methanol vapor then reacts with the methanol cracking catalyst to generate hydrogen-rich syngas. The methanol aqueous solution is then further heated and evaporated into gaseous methanol aqueous solution. The gaseous methanol aqueous solution is then further processed in the reforming system... The reforming reaction in the reformer generates hydrogen-rich syngas, efficiently converting low-grade heat into high-grade chemical substances in the hydrogen-rich syngas. This allows the thermal energy from the higher temperature range of the medium- and high-temperature exhaust gas to drive the methanol to undergo an endothermic cracking reaction. After the temperature of the medium- and high-temperature exhaust gas decreases, the thermal energy from that temperature range is used to drive the methanol and water vapor to undergo a reforming reaction. This process maximizes the recovery and utilization of heat from the entire temperature range of the medium- and high-temperature exhaust gas. The hydrogen-rich syngas generated in the reformer and cracker is then sent back to the combustion power system for re-combustion, thereby achieving energy grade upgrading and reuse. This improves the effectiveness of deep recovery and energy grade upgrading of medium- and high-temperature exhaust gas. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the recycling efficiency enhancement system of the present invention;

[0022] Figure 2 This is a schematic diagram illustrating the implementation of the recovery and efficiency enhancement system of the present invention in a gas turbine;

[0023] Figure 3This is a schematic diagram illustrating the implementation of the recycling efficiency enhancement system of this invention in an internal combustion engine;

[0024] Figure 4 This is a schematic diagram illustrating the implementation of the recovery and efficiency enhancement system of this invention in a boiler;

[0025] Figure 5 This is a schematic diagram of the diversion process in the recycling efficiency enhancement system of this invention;

[0026] Figure 6 This is a schematic diagram illustrating the implementation of the present invention's recycling and efficiency enhancement system for diversion in a gas turbine;

[0027] Figure 7 This is a schematic diagram illustrating the implementation of the recycling and efficiency enhancement system of the present invention in an internal combustion engine for diversion.

[0028] Figure 8 This is a schematic diagram illustrating the implementation of the recycling and efficiency enhancement system of the present invention in a boiler for diversion.

[0029] Figure 9 This is a schematic diagram of the Wobbe number adjustment in the recycling efficiency enhancement system of the present invention;

[0030] Figure 10 This is a schematic diagram illustrating the implementation of the Wobbe number regulation using the recovery and efficiency enhancement system of this invention in a gas turbine;

[0031] Figure 11 This is a schematic diagram illustrating the implementation of the Wobbe number adjustment using the recovery and efficiency enhancement system of this invention in an internal combustion engine;

[0032] Figure 12 This is a schematic diagram illustrating the implementation of the Wobbe number adjustment using the recovery and efficiency enhancement system of this invention in a boiler. Detailed Implementation

[0033] This invention provides a methanol online cracking and reforming coupled with deep waste heat recovery and efficiency enhancement system, which is described below in conjunction with... Figures 1 to 12 The present invention is illustrated by the structural diagram shown below.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Please see Figure 1 , Figure 1This is a schematic diagram of the overall structure of the waste heat recovery and efficiency enhancement system in this embodiment. A methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, and a combustion power system 3. Fuel is input into the combustion power system 3, where combustion releases heat energy and exhausts medium-to-high temperature exhaust gas containing heat. The cracking system 1 includes a first evaporator 15 and a cracker 16. The cracker 16 is connected to the first evaporator 15 and the combustion power system 3 via pipes. The cracker 16 is filled with a methanol cracking catalyst. The medium-to-high temperature exhaust gas containing heat from the combustion power system 3 flows sequentially through the cracker 16 and the first evaporator 15 via pipes and is then discharged. Liquid methanol is input into the first evaporator 15 and heated. The methanol vapor is evaporated into methanol vapor, which enters the cracker 16 and undergoes a cracking reaction to generate hydrogen-rich synthesis gas. The reforming system 2 includes a reformer 17 and a second evaporator 18. The reformer 17 is connected to the first evaporator 15 and the second evaporator 18 through pipelines. The low-temperature exhaust gas containing heat discharged from the first evaporator 15 flows through the reformer 17 and the second evaporator 18 in sequence through pipelines. The methanol aqueous solution is input into the second evaporator 18 and evaporated into gaseous methanol aqueous solution. The gaseous methanol aqueous solution enters the reformer 17 and undergoes a reforming reaction to generate hydrogen-rich synthesis gas. The hydrogen-rich synthesis gas generated by the reformer 17 and the cracker 16 is input into the combustion power system 3 through pipelines for combustion.

[0036] The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system in this embodiment is based on chemical reheating and includes the following two reactions: methanol cracking reaction and methanol steam reforming reaction, Equations (1) and (2). The high-temperature exhaust gas in the high-temperature range drives the methanol to absorb heat and undergo cracking reaction. After the temperature of the high-temperature exhaust gas decreases, the heat energy in this temperature range is used to drive the methanol steam reforming reaction. The optimized stepped reheating system uses the medium and low-grade waste heat (medium and high-temperature exhaust gas) emitted by the combustion power system to drive the methanol endothermic cracking reaction and the methanol steam reforming reaction in sequence. Through the above chemical reaction process, the low-grade heat is efficiently converted into high-grade chemical energy in hydrogen-rich synthesis gas and then sent back to the combustion power system to burn and release heat energy again. This realizes the upgrading and reuse of energy grade, improves the thermal efficiency of the combustion power system, and significantly enhances the technical and economic benefits of the recovery and efficiency enhancement system.

[0037]

[0038]

[0039] In this embodiment, the methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system recovers and utilizes the heat in medium- and high-temperature exhaust gas. The underlying logic is based on chemical regenerative reaction to improve energy grade. Methanol is selected as fuel to drive liquid methanol cracking reaction and methanol-water solution reforming reaction to produce hydrogen-rich syngas. This hydrogen-rich syngas is then used as fuel to upgrade the energy grade of waste heat. At the same time, a specific stepped regenerative system and optimized control strategy are adopted to achieve efficient energy utilization.

[0040] In this embodiment, the methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system typically operates within a temperature range of 300℃ to 650℃, while the methanol reforming reaction operates within a temperature range of 120℃ to 300℃. Through the aforementioned methanol cracking and reforming reactions, the heat from almost the entire temperature range of the medium- and high-temperature exhaust gas can be utilized.

[0041] In existing technologies, when absorbing heat from high-temperature exhaust gas through chemical reactions, certain fuels are selected as carriers, such as ammonia. However, the inherent chemical properties of ammonia may impose extremely high requirements on fuel storage, transportation, and equipment materials.

[0042] The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system in this embodiment uses methanol as the energy carrier for chemical reactions. Compared with other fuels, such as methane and ammonia, it has significant advantages in terms of safety, infrastructure requirements, and economy in storage, transportation, and refueling. Using methanol as a carrier ensures the safety and convenience of liquid fuel while realizing the efficient conversion of low-grade waste heat into high-grade chemical energy, significantly improving system energy efficiency and fuel utilization. The equipment has a compact structure, flexible control, and is suitable for distributed energy scenarios of various scales.

[0043] Furthermore, methanol can be synthesized from carbon capture carbon dioxide and renewable hydrogen, meaning it can be coupled with energy storage technology. With this technology, the methanol online cracking and reforming coupled with deep waste heat recovery and efficiency enhancement system proposed in this invention can achieve near carbon neutrality throughout the entire operation process, providing key technical support for deep decarbonization in transportation, industry, and power generation, and possessing significant social value and broad application prospects.

[0044] The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system in this embodiment uses methanol as a suitable energy carrier and constructs a reasonable stepped regeneration system (first methanol cracking reaction, then methanol steam reforming reaction) to achieve optimized matching of medium and high temperature exhaust gas with catalyst and fuel conversion rate, thereby enabling the system to: efficiently recover heat energy and improve exhaust gas efficiency.

[0045] The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system in this embodiment mainly includes a cracking system 1, a reforming system 2, and a combustion power system 3.

[0046] Among them, the cracking system 1 is one of the core units of chemical energy conversion and upgrading. Its main function is to receive liquid methanol transported from the outside and absorb the heat from the medium and high temperature exhaust gas discharged from the combustion power system 3, evaporate the liquid methanol into methanol vapor, and then absorb the heat in the exhaust gas through the cracking reaction to convert the liquid methanol into syngas fuel rich in hydrogen and carbon monoxide.

[0047] Reforming system 2 is one of the core units for chemical energy conversion and upgrading. Its main function is to receive methanol-water solution with a well-matched carbon-hydrogen ratio from the outside, absorb the remaining heat in the exhaust gas after the temperature is reduced by the heat absorbed by cracking system 1, evaporate the methanol-water solution into gaseous methanol-water solution, and then convert the gaseous methanol-water solution into syngas fuel rich in hydrogen and carbon dioxide through a reforming reaction.

[0048] Combustion power system 3, as the core unit for high-grade energy release and work / heat conversion, is designed to receive the mixed gas of hydrogen-rich syngas produced by cracking system 1 and reforming system 2, and convert its chemical energy into high-grade thermal energy through combustion, thereby outputting mechanical work or directly supplying heat to the outside.

[0049] In the basic architecture of the methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system, the main pathways are divided into the following three parts:

[0050] 1. Liquid methanol path: Liquid methanol enters the cracking system 1, absorbs heat from the exhaust gas and evaporates into methanol vapor. The methanol vapor then reacts with the methanol cracking catalyst to generate hydrogen-rich synthesis gas, which is then transported to the combustion power system 3.

[0051] 2. Methanol-water solution path: The methanol-water solution with the correct carbon-hydrogen ratio enters the reforming system 2, absorbs the remaining heat in the exhaust gas (the exhaust gas absorbs some heat from the liquid methanol and the cracking reaction in the cracking system 1), and undergoes a reforming reaction to generate hydrogen-rich synthesis gas, which is then transported to the combustion power system 3.

[0052] 3. Core exhaust gas heat recovery path: After the combustion power system 3 is running, it generates a large amount of medium- and high-temperature exhaust gas with medium and low grade heat. This part of the heat passes through the cracking system 1 and the reforming system 2 in sequence, serving as the heat source for cracking, reforming reactions, etc.

[0053] Based on the above infrastructure, this embodiment constructs a closed-loop system for efficient energy cascade recovery and chemical energy utilization. Compared with traditional waste heat cascade recovery, this embodiment couples methanol cracking and reforming reactions, upgrading low-grade waste heat into high-grade chemical energy, realizing energy grade upgrade and significantly improving the overall energy utilization rate of the entire system.

[0054] Depending on the specific application scenario, the combustion power system in the above embodiments can be one of a gas turbine, an internal combustion engine 23, or a boiler 25.

[0055] 1.1 Application of Recovery Enhancement System in Gas Turbine

[0056] Please see Figure 2 , Figure 2 This is a schematic diagram of the implementation of the recovery and efficiency enhancement system in a gas turbine in this embodiment. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, and a combustion power system 3. The cracking system 1 includes: a first evaporator 15, a cracker 16, a liquid methanol storage tank 19, and a first booster pump 20. The reforming system 2 includes: a reformer 17, a second evaporator 18, a methanol aqueous solution storage tank 21, and a second booster pump 22. The combustion power system 3 includes: a compressor 11, a regenerator 12, a combustion chamber 13, and a turbine 14.

[0057] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0058] Air: The inlet of compressor 11 is connected to the atmosphere, the outlet of compressor 11 is connected to the first inlet of regenerator 12, and the first outlet of regenerator 12 is connected to the first inlet of combustion chamber 13.

[0059] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, and the first outlet of cracker 16 is connected to the second inlet of combustion chamber 13.

[0060] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22, the outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18, the first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17, and the first outlet of the reformer 17 is connected to the second inlet of the combustion chamber 13.

[0061] Gas path: The outlet of combustion chamber 13 is connected to the inlet of turbine 14, the outlet of turbine 14 is connected to the second inlet of regenerator 12, the second outlet of regenerator 12 is connected to the second inlet of pyrolyzer 16, the second outlet of pyrolyzer 16 is connected to the second inlet of first evaporator 15, the second outlet of first evaporator 15 is connected to the second inlet of reformer 17, the second outlet of reformer 17 is connected to the second inlet of second evaporator 18, and the second outlet of second evaporator 18 is connected to the atmosphere.

[0062] When the recovery and efficiency enhancement system is running, the liquid methanol stored in the liquid methanol storage tank 19 is pressurized to the set pressure by the first booster pump 20 and then transported to the first evaporator 15 to absorb heat and be converted into methanol vapor. Subsequently, the methanol vapor enters the cracker 16 to absorb heat and be converted into hydrogen, carbon monoxide and hydrogen-rich synthesis gas that has not been converted into methanol.

[0063] The methanol-water solution stored in the methanol-water solution storage tank 21 is pressurized to the set pressure by the second booster pump 22 and then transported to the second evaporator 18 to absorb heat and be converted into gaseous methanol-water solution. Subsequently, the gaseous methanol-water solution enters the reformer 17 to absorb heat and be converted into hydrogen, carbon dioxide and hydrogen-rich synthesis gas of unconverted methanol.

[0064] At room temperature and pressure, air is pressurized to the system set pressure by compressor 11. The pressurized and heated air enters the regenerator 12, and then enters the combustion chamber 13 to mix with the hydrogen-rich synthesis gas produced by the cracking and reforming reactions for combustion. The high-temperature combustion gas produced enters the turbine 14 to expand and do work. The expanded gas still has a high temperature and first enters the regenerator 12 to heat the air compressed by compressor 11. Then, it enters the cracker 16, the first evaporator 15, the reformer 17, and the second evaporator 18 in sequence to provide heat, thus completing one working cycle.

[0065] Specifically, the cracker 16 is equipped with a dedicated methanol cracking catalyst (such as a copper-based or noble metal catalyst) to ensure the conversion rate of the methanol cracking reaction.

[0066] In this embodiment, the medium- and high-temperature exhaust gas discharged from turbine 14 is utilized efficiently in a cascade manner. The system optimizes and matches the heat energy of the exhaust gas with the heat demand of four different temperature zones, namely air regeneration, methanol cracking, methanol evaporation, and methanol reforming, according to the temperature grade of the exhaust gas. This maximizes the recovery of usable energy in the exhaust gas and reduces the energy loss and thermal pollution that is ultimately discharged into the environment, thereby significantly improving the overall thermal efficiency of the gas turbine.

[0067] 1.2 Application of Recycling Enhancement System in Internal Combustion Engines

[0068] Please see Figure 3 , Figure 3 This is a schematic diagram of the implementation of the recovery and efficiency enhancement system in an internal combustion engine. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes: cracking system 1, reforming system 2 and combustion power system 3. The cracking system 1 and reforming system 2 have the same composition as the recovery and efficiency enhancement system used in a gas turbine. The combustion power system 3 includes: internal combustion engine 23 and three-way catalytic converter 24.

[0069] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0070] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, and the first outlet of cracker 16 is connected to the third inlet of internal combustion engine 23.

[0071] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22, the outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18, the first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17, and the first outlet of the reformer 17 is connected to the third inlet of the internal combustion engine 23.

[0072] Gas path: The first inlet of the internal combustion engine 23 is connected to the atmosphere, the second inlet of the internal combustion engine 23 is connected to the fuel, the outlet of the internal combustion engine 23 is connected to the second inlet of the pyrolysis unit 16, the second outlet of the pyrolysis unit 16 is connected to the second inlet of the first evaporator 15, the second outlet of the first evaporator 15 is connected to the second inlet of the reformer 17, the second outlet of the reformer 17 is connected to the second inlet of the second evaporator 18, the second outlet of the second evaporator 18 is connected to the inlet of the three-way catalytic converter 24, and the outlet of the three-way catalytic converter 24 is connected to the atmosphere.

[0073] During operation of this recovery and efficiency enhancement system, liquid methanol stored in liquid methanol storage tank 19 is pressurized to a set pressure by the first booster pump 20 and then sent to the first evaporator 15 to absorb heat and be converted into methanol vapor. The methanol vapor then enters the cracker 16 to absorb heat and be converted into hydrogen, carbon monoxide, and hydrogen-rich synthesis gas containing unconverted methanol. Methanol-water solution stored in methanol-water solution storage tank 21 is pressurized to a set pressure by the second booster pump 22 and then sent to the second evaporator 18 to absorb heat and be converted into gaseous methanol-water solution. The gaseous methanol-water solution then enters the reformer 17 to absorb heat and be converted into hydrogen, carbon dioxide, and hydrogen-rich synthesis gas containing unconverted methanol. At room temperature and pressure, air and other fuels enter the internal combustion engine 23 and mix with the hydrogen-rich synthesis gas produced by reforming and cracking for combustion. The high-temperature combustion gas produced sequentially enters the cracker 16, the first evaporator 15, the reformer 17, and the second evaporator 18 to provide heat, and finally enters the three-way catalytic converter 24 for purification before being discharged into the atmosphere, thus completing one working cycle.

[0074] Specifically, when the internal combustion engine uses methanol as fuel, the hydrogen-rich syngas produced by the cracking and reforming of this system can be used as fuel. When the internal combustion engine uses gasoline or diesel as fuel, the hydrogen-rich syngas produced by the cracking and reforming of this system can be used as auxiliary fuel to assist the combustion or cold start of the internal combustion engine.

[0075] Specifically, in this embodiment, hydrogen-rich syngas is injected into the internal combustion engine for combustion or auxiliary combustion. This can help the internal combustion engine and other systems work flexibly in dual-fuel mode. The participation of hydrogen-rich syngas in the combustion of the internal combustion engine can improve the internal combustion performance of the internal combustion engine. It can accelerate the start-up of the internal combustion engine while reducing the emission of harmful substances from the internal combustion engine, thereby significantly improving the effective thermal efficiency of the internal combustion engine. It also provides technical possibilities for achieving a more efficient and cleaner advanced combustion mode.

[0076] 1.3 Application of Recovery and Efficiency Enhancement System in Boilers

[0077] Please see Figure 4 , Figure 4 This is a schematic diagram of the implementation of the recovery and efficiency enhancement system in the boiler in this embodiment. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes: cracking system 1, reforming system 2 and combustion power system 3. The cracking system 1 and reforming system 2 have the same composition as the recovery and efficiency enhancement system applied in the gas turbine. The combustion power system 3 is the boiler 25.

[0078] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0079] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, and the first outlet of cracker 16 is connected to the third inlet of boiler 25.

[0080] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22, the outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18, the first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17, and the first outlet of the reformer 17 is connected to the third inlet of the boiler 25.

[0081] Gas path: The first inlet of boiler 25 is connected to the atmosphere, the second inlet of boiler 25 is connected to the heating medium, the outlet of boiler 25 is connected to the second inlet of pyrolyzer 16, the second outlet of pyrolyzer 16 is connected to the second inlet of first evaporator 15, the second outlet of first evaporator 15 is connected to the second inlet of reformer 17, the second outlet of reformer 17 is connected to the second inlet of second evaporator 18, and the second outlet of second evaporator 18 is connected to the atmosphere.

[0082] During operation of this recovery and efficiency enhancement system, liquid methanol stored in liquid methanol storage tank 19 is pressurized to a set pressure by the first booster pump 20 and then transported to the first evaporator 15 to absorb heat and be converted into methanol vapor. The methanol vapor then enters the cracker 16 to absorb heat and be converted into hydrogen, carbon monoxide, and hydrogen-rich synthesis gas containing unconverted methanol. Methanol-water solution stored in methanol-water solution storage tank 21 is pressurized to a set pressure by the second booster pump 22 and then transported to the second evaporator 18 to absorb heat and be converted into gaseous methanol-water solution. The gaseous methanol-water solution then enters the reformer 17 to absorb heat and be converted into hydrogen, carbon dioxide, and hydrogen-rich synthesis gas containing unconverted methanol. At room temperature and pressure, air enters the boiler 25 and mixes with the hydrogen-rich synthesis gas produced by reforming and cracking for combustion. The high-temperature combustion gas generated flows through the boiler's radiant and convective heating surfaces, transferring heat to the heating medium to complete the heating task. The high-temperature gas then flows sequentially through the pyrolyzer 16, the first evaporator 15, the reformer 17, and the second evaporator 18, providing heat before finally being discharged into the atmosphere, thus completing one working cycle.

[0083] Specifically, in this embodiment, the waste heat in the boiler flue gas that would otherwise be discharged through the chimney is converted into highly reactive syngas fuel and then returned to the boiler for combustion. This further utilizes the energy of the system itself, thereby reducing the amount of external fuel input required for the boiler to achieve the same heat output. This significantly improves the fuel utilization efficiency of boilers and other systems, and has significant practical value for energy conservation and consumption reduction in high-energy-consuming industries.

[0084] In existing technologies, the load and external environment of combustion power systems are constantly changing in complex and ever-changing industrial environments, causing the temperature and flow rate of the exhaust gas from the combustion power system to fluctuate continuously. These fluctuations directly impact the smooth progress of endothermic chemical reactions, making it impossible for the composition and combustion characteristics of the fuels produced by cracking and reforming reactions to remain consistent. Once the fuel quality becomes unstable, it not only seriously threatens the reliability of the combustion process in the combustion power system, but also hinders the implementation of advanced and efficient combustion control strategies.

[0085] For example, when the system operates under partial or low load conditions, its exhaust temperature and flow rate will decrease significantly. This will directly lead to insufficient waste heat temperature, which in turn will greatly reduce the methanol conversion rate in the cracking system. If hydrogen-rich syngas containing too much unreacted methanol is directly introduced into the combustion power system, it may cause serious problems such as unstable combustion, calorific value fluctuations, or even flameout, resulting in huge economic losses.

[0086] Therefore, the core bottleneck faced by the methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system in the above embodiments is how to balance operational stability and fuel quality consistency under dynamic operating conditions.

[0087] As a further optimization, this embodiment also includes a methanol synthesis gas separation system 4, which is located between the cracking system 1, the reforming system 2, and the combustion power system 3. The hydrogen-rich synthesis gas generated by the reformer 17 and the cracker 16 is input into the methanol synthesis gas separation system 4 to separate the uncracked and reformed methanol gas from the hydrogen-rich synthesis gas, and then the hydrogen-rich synthesis gas is input into the combustion power system 3.

[0088] This embodiment addresses the issues that occur in the combustion power system 3 under actual operation, such as load fluctuations leading to fluctuations in the conversion rate of methanol cracking and reforming reactions, limited methanol combustion thermal efficiency, and the generation of unburned HC / CO. The methanol syngas separation system 4 adaptively diverts the hydrogen-rich syngas generated by the reformer 17 and cracker 16, separating unreacted methanol gas from the hydrogen-rich syngas. This ensures that the composition and combustion characteristics of the hydrogen-rich syngas entering the combustion power system remain stable, preventing combustion deterioration or misfires in the combustion power system. This improves the reliability of the combustion process in the combustion power system, facilitates the implementation of advanced and efficient combustion control strategies, and enhances the system's operational stability and adaptability across a wide load range.

[0089] Please see Figure 5 , Figure 5 This is a schematic diagram of the diversion process of the recovery and efficiency enhancement system in this embodiment. The recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, a combustion power system 3, and a methanol synthesis gas separation system 4.

[0090] Among them, the structures of pyrolysis system 1, reforming system 2 and combustion power system 3 are similar to those of... Figure 1 The basic architecture is the same. For the methanol synthesis gas separation system 4, its main function is to separate methanol vapor from hydrogen-rich synthesis gas using a suitable separation method, so as to avoid the hydrogen-rich synthesis gas entering the combustion power system 3 containing too much methanol. Depending on the specific application scenario, this subsystem can be a gas turbine, a reciprocating internal combustion engine, a boiler, or a heating furnace, etc.

[0091] In the architecture of the methanol online cracking and reforming coupled with deep waste heat recovery and efficiency enhancement system in this embodiment, the main paths are divided into the following three parts:

[0092] 1. Liquid methanol path: Liquid methanol enters the cracking system 1, absorbs heat from the exhaust gas and evaporates into methanol vapor. The methanol vapor then reacts with the methanol cracking catalyst to generate hydrogen-rich syngas. The hydrogen-rich syngas then enters the methanol syngas separation system 4 for separation. The separated methanol can be recovered or re-entered into the cracking system or reforming system. The separated hydrogen-rich syngas is then transported to the combustion power system 3.

[0093] 2. Methanol-water solution path: The methanol-water solution with the correct carbon-hydrogen ratio enters the reforming system 2, where it absorbs the remaining heat from the exhaust gas (the exhaust gas absorbs some heat from the liquid methanol and the cracking reaction in the cracking system 1), and undergoes a reforming reaction to generate hydrogen-rich syngas. The syngas then enters the methanol-syngas separation system 4 for separation. The separated methanol can be recovered or re-entered into the cracking system or the reforming system, while the separated hydrogen-rich syngas is transported to the combustion power system 3.

[0094] 3. Core exhaust gas heat recovery path: After the combustion power system 3 is running, it generates a large amount of medium- and high-temperature exhaust gas with medium and low grade heat. This part of the heat passes through the cracking system 1 and the reforming system 2 in sequence, serving as the heat source for the cracking reaction and the reforming reaction.

[0095] As a further optimization, this embodiment provides a specific structure of a methanol synthesis gas separation system. The methanol synthesis gas separation system 4 includes a separator 26, a fifth control valve 28, and a sixth control valve 29. The separator 26 is connected to the cracker 16 of the cracking system 1, the reformer 17 of the reforming system 2, and the combustion power system 3 through pipelines. One end of the fifth control valve 28 and the sixth control valve 29 are connected to the separator 26, and the other end is connected to the cracker 16 and the reformer 17, respectively, so that the separated methanol gas can undergo cracking and reforming reactions again.

[0096] In this embodiment, the methanol synthesis gas separation system uses separator 26 to separate unreacted methanol gas from hydrogen-rich synthesis gas, thereby keeping the composition and combustion characteristics of the hydrogen-rich synthesis gas input to the combustion power system 3 stable. At the same time, the fifth control valve 28 and the sixth control valve 29 can be used to transport the separated methanol gas to cracker 16 and reformer 17, so that methanol can re-enter the cracking and reforming path, which significantly improves the utilization efficiency of the energy carrier and the stability and adaptability of the system under varying operating conditions.

[0097] Specifically, in this embodiment, the separator 26 is a membrane separator, and the separated methanol gas can be centrally recovered in addition to entering the cracking and reforming pathways.

[0098] As a further optimization, in this embodiment, the separator 26 is connected to the methanol-water solution storage tank 21 through a pipeline, and a seventh control valve 30 and a condenser 27 are sequentially installed on the pipeline along the methanol gas flow direction to condense the separated methanol gas. The methanol-water solution storage tank 21 is connected to the second evaporator 18 through a pipeline, and a second booster pump 22 is installed on the pipeline to input the methanol-water solution into the second evaporator 18.

[0099] This embodiment proposes a structure for centralized methanol recovery. By controlling the seventh control valve 30, methanol gas enters the condenser 27 through the pipeline, condenses the methanol gas into liquid, and then inputs it into the methanol aqueous solution storage tank 21. Water is then injected into the methanol aqueous solution storage tank 21 to obtain a methanol aqueous solution. The methanol aqueous solution is then transported to the second evaporator 18 by the second booster pump 22, thereby realizing the recovery and reuse of the separated methanol.

[0100] Based on the architecture of the above-mentioned methanol online cracking and reforming coupled with deep waste heat recovery and efficiency enhancement system, such as Figure 5 As shown, the following working modes can be automatically switched according to the actual working conditions:

[0101] Mode 1: "Direct Supply Mode" under rated operating conditions (or high load conditions)

[0102] In this mode, combustion power system 3 can provide high-temperature, high-flow-rate medium-high temperature exhaust gas, sufficient to ensure high methanol conversion rates in cracking system 1 and reforming system 2. At this time, control valves 28 (5th), 29 (6th), and 30 (7th) are closed, and the hydrogen synthesis gas produced by the cracking and reforming reactions is directly supplied to combustion power system 3. In this mode, the system operates in the same mode as the basic system. Figure 1 same.

[0103] Mode 2: "Purification Supply Mode" under Partial Load (or Low Load) Conditions

[0104] In this mode, because the combustion power system 3 cannot provide high-temperature, high-flow-rate exhaust gas, the methanol conversion rate in the cracking system 1 and reforming system 2 is low. The generated hydrogen-rich syngas has a high methanol content, which affects the stability of the combustion power system 3. At this time, the methanol syngas separation system 4 starts working, and the separated methanol can be recovered through the seventh control valve 30 or enter the cracking system 1 or reforming system 2 through the cooperation of the fifth control valve 28 and the sixth control valve 29, and re-participate in the system operation. This working mode avoids fuel waste, ensures the stability of system operation, and greatly improves the overall material utilization rate of the system.

[0105] Specifically, the methanol synthesis gas separation system 4 can achieve proportional control of methanol separation in hydrogen-rich synthesis gas, ensuring the stability of system operation.

[0106] The methanol online cracking and reforming coupled waste heat deep recovery efficiency enhancement system in this embodiment introduces an adaptive diversion and purification control strategy driven by operating conditions. This strategy can intelligently adjust the fuel processing path according to the system load status, ensuring that the fuel quality supplied to the combustion power system can be maintained within the specifications required for stable combustion under any operating conditions. This greatly expands the boundaries of the system's efficient and stable operation and significantly enhances the system's operational robustness and adaptability to operating conditions.

[0107] 2.1 Application of Recycling Enhancement System for Diversion in Gas Turbines

[0108] Please see Figure 6 , Figure 6 This is a schematic diagram of the implementation of the waste heat recovery and efficiency enhancement system in the gas turbine. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, a combustion power system 3, and a methanol syngas separation system 4.

[0109] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0110] Air: The inlet of compressor 11 is connected to the atmosphere, the outlet of compressor 11 is connected to the first inlet of regenerator 12, and the first outlet of regenerator 12 is connected to the first inlet of combustion chamber.

[0111] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, the first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the second inlet of combustion chamber 13, and the second outlet of separator 26 is connected to the first inlet of cracker 16 through fifth control valve 28;

[0112] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22. The outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18. The first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17. The first outlet of the reformer 17 is connected to the first inlet of the separator 26. The first outlet of the separator 26 is connected to the second inlet of the combustion chamber 13. The third outlet of the separator 26 is connected to the first inlet of the reformer 17 through the sixth control valve 29 and to the inlet of the condenser 27 through the seventh control valve 30. The outlet of the condenser 27 is connected to the inlet of methanol-water solution storage tank 21.

[0113] Gas path: The outlet of combustion chamber 13 is connected to the inlet of turbine 14, the outlet of turbine 14 is connected to the second inlet of regenerator 12, the second outlet of regenerator 12 is connected to the second inlet of pyrolyzer 16, the second outlet of pyrolyzer 16 is connected to the second inlet of first evaporator 15, the second outlet of first evaporator 15 is connected to the second inlet of reformer 17, the second outlet of reformer 17 is connected to the second inlet of second evaporator 18, and the second outlet of second evaporator 18 is connected to the atmosphere.

[0114] When the recycling efficiency enhancement system is running in mode one, separator 26 does not operate, and its workflow is the same as the basic system. Figure 2 The process is the same.

[0115] In Mode 2, the recovery and efficiency enhancement system operates as follows: Liquid methanol stored in liquid methanol storage tank 19 is pressurized to a set pressure by the first booster pump 20 and then transported to the first evaporator 15 to absorb heat and convert into methanol vapor. The methanol vapor then enters the cracker 16 to absorb heat and convert into hydrogen, carbon monoxide, and hydrogen-rich synthesis gas containing unconverted methanol. Methanol-water solution stored in methanol-water solution storage tank 21 is pressurized to a set pressure by the second booster pump 22 and then transported to the second evaporator 18 to absorb heat and convert into gaseous methanol-water solution. This gaseous methanol-water solution then enters the reformer 17 to absorb heat and convert into hydrogen, carbon dioxide, and hydrogen-rich synthesis gas containing unconverted methanol. This portion of hydrogen-rich synthesis gas generated by the cracker 16 and reformer 17 is mixed and enters the separator 26 for methanol separation according to a set synthesis gas ratio.

[0116] At room temperature and pressure, air is pressurized to the system set pressure by the compressor 11. The pressurized and heated air enters the regenerator 12, and then enters the combustion chamber 13 to mix with the hydrogen-rich synthesis gas produced by the cracking and reforming reactions for combustion. The high-temperature combustion gas produced enters the turbine 14 to expand and do work. The expanded gas still has a high temperature and first enters the regenerator 12 to heat the air compressed by the compressor 11. Then, it enters the cracker 16, the first evaporator 15, the reformer 17, and the second evaporator 18 in sequence to provide heat.

[0117] The methanol separated by separator 26 is diverted as needed. When additional methanol is needed for the reforming reaction, control valves 28 and 30 are closed, and control valve 29 is opened, allowing the separated methanol to re-enter reformer 17 for the reforming reaction. When additional methanol is needed for the cracking reaction, control valves 29 and 30 are closed, and control valve 28 is opened, allowing the separated methanol to re-enter cracker 16 for the cracking reaction. When this portion of methanol needs to be stored, control valves 28 and 29 are closed, and control valve 30 is opened, allowing the methanol to be stored in methanol-water solution storage tank 21. This completes one working cycle.

[0118] Specifically, when storing the separated methanol in the methanol-water solution storage tank 21, it is necessary to add the corresponding amount of water according to the set carbon-hydrogen ratio to ensure the stability of the reforming reaction conversion rate.

[0119] The methanol online cracking and reforming coupled with deep waste heat recovery efficiency enhancement system in this embodiment ensures that the combustion chamber of the gas turbine always obtains fuel of the required quality, whether it is in the stable operating range at full load or in the low load operation process, through the above-mentioned adaptive flow path switching and material circulation design. This greatly improves the operating stability of the gas turbine unit and its adaptability to complex operating conditions. At the same time, by recycling unreacted fuel, the system ensures high energy efficiency under all operating conditions.

[0120] 2.2 Application of the Recycling Enhancement System for Diversion in Internal Combustion Engines

[0121] Please see Figure 7 , Figure 7 This is a schematic diagram illustrating the implementation of the waste heat recovery and efficiency enhancement system in an internal combustion engine. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, a combustion power system 3, and a methanol synthesis gas separation system 4.

[0122] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0123] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, the first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the third inlet of internal combustion engine 23, and the second outlet of separator 26 is connected to the first inlet of cracker 16 through fifth control valve 28;

[0124] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22. The outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18. The first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17. The first outlet of the reformer 17 is connected to the first inlet of the separator 26. The first outlet of the separator 26 is connected to the third inlet of the internal combustion engine 23. The third outlet of the separator 26 is connected to the first inlet of the reformer 17 through the sixth control valve 29 and to the inlet of the condenser 27 through the seventh control valve 30. The outlet of the condenser 27 is connected to the inlet of methanol-water solution storage tank 21.

[0125] Gas path: The first inlet of the internal combustion engine 23 is connected to the atmosphere, the second inlet of the internal combustion engine 23 is connected to the fuel, the outlet of the internal combustion engine 23 is connected to the second inlet of the pyrolysis unit 16, the second outlet of the pyrolysis unit 16 is connected to the second inlet of the first evaporator 15, the second outlet of the first evaporator 15 is connected to the second inlet of the reformer 17, the second outlet of the reformer 17 is connected to the second inlet of the second evaporator 18, the second outlet of the second evaporator 18 is connected to the inlet of the three-way catalytic converter 24, and the outlet of the three-way catalytic converter 24 is connected to the atmosphere.

[0126] When the recycling efficiency enhancement system is running in mode one, separator 26 does not operate, and its workflow is the same as the basic system. Figure 3 The process is the same as in the previous one.

[0127] When the recovery and efficiency enhancement system is running in mode two, the liquid methanol stored in the liquid methanol storage tank 19 is pressurized to the set pressure by the first booster pump 20 and then transported to the first evaporator 15 to absorb heat and be converted into methanol vapor. Subsequently, the methanol vapor enters the cracker 16 to absorb heat and be converted into hydrogen, carbon monoxide and hydrogen-rich synthesis gas that has not been converted into methanol.

[0128] The methanol-water solution stored in the methanol-water solution storage tank 21 is pressurized to the set pressure by the second booster pump 22 and then sent to the second evaporator 18 to absorb heat and be converted into gaseous methanol-water solution. Subsequently, the gaseous methanol-water solution enters the reformer 17 to absorb heat and be converted into hydrogen, carbon dioxide and hydrogen-rich synthesis gas that has not been converted into methanol. This portion of hydrogen-rich synthesis gas generated by the cracker 16 and the reformer 17 is mixed and enters the separator 26, where methanol is separated according to the set synthesis gas ratio.

[0129] Normal temperature and pressure air and other fuels enter the internal combustion engine 23, and then are mixed with hydrogen-rich syngas processed by separator 26 in a certain proportion for combustion. The high-temperature gas produced by combustion enters the cracker 16, the first evaporator 15, the reformer 17 and the second evaporator 18 in sequence to provide heat, and finally enters the three-way catalytic converter 24 for purification before being discharged into the atmosphere.

[0130] The methanol separated by separator 26 is diverted as needed. When additional methanol is needed for the reforming reaction, control valves 28 and 30 are closed, and control valve 29 is opened, allowing the separated methanol to re-enter reformer 17 for the reforming reaction. When additional methanol is needed for the cracking reaction, control valves 29 and 30 are closed, and control valve 28 is opened, allowing the separated methanol to re-enter cracker 16 for the cracking reaction. When this portion of methanol needs to be stored, control valves 28 and 29 are closed, and control valve 30 is opened, allowing the methanol to be stored in methanol-water solution storage tank 21. This completes one working cycle.

[0131] In this embodiment, the problem of unstable methanol conversion rate caused by exhaust temperature changes during variable load operation of the internal combustion engine is solved by the aforementioned flow splitting control. The operating mode is automatically switched when the internal combustion engine load changes. Through the separator 26, it is ensured that even under low-temperature pyrolysis conditions, the syngas entering the cylinder remains of stable quality, effectively avoiding problems such as combustion deterioration, misfire, or excessive pollutant emissions due to incomplete combustion.

[0132] 2.3 Application of the recovery and efficiency enhancement system for diversion in boilers

[0133] Please see Figure 8 , Figure 8 This is a schematic diagram of the implementation of the waste heat recovery and efficiency enhancement system in the boiler. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, a combustion power system 3, and a methanol synthesis gas separation system 4.

[0134] In this embodiment, the connection of the recovery enhancement system can be divided into the following parts according to the type of working medium:

[0135] Liquid methanol cracking path: The outlet of liquid methanol storage tank 19 is connected to the inlet of first booster pump 20, the outlet of first booster pump 20 is connected to the first inlet of first evaporator 15, the first outlet of first evaporator 15 is connected to the first inlet of cracker 16, the first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the third inlet of boiler 25, and the second outlet of separator 26 is connected to the first inlet of cracker 16 through fifth control valve 28.

[0136] Methanol-water solution reforming path: The outlet of methanol-water solution storage tank 21 is connected to the inlet of the second booster pump 22. The outlet of the second booster pump 22 is connected to the first inlet of the second evaporator 18. The first outlet of the second evaporator 18 is connected to the first inlet of the reformer 17. The first outlet of the reformer 17 is connected to the first inlet of the separator 26. The first outlet of the separator 26 is connected to the third inlet of the boiler 25. The third outlet of the separator 26 is connected to the first inlet of the reformer 17 through the sixth control valve 29 and to the inlet of the condenser 27 through the seventh control valve 30. The outlet of the condenser 27 is connected to the inlet of methanol-water solution storage tank 21.

[0137] Gas path: The first inlet of boiler 25 is connected to the atmosphere, the second inlet of boiler 25 is connected to the heating medium, the outlet of boiler 25 is connected to the second inlet of pyrolyzer 16, the second outlet of pyrolyzer 16 is connected to the second inlet of first evaporator 15, the second outlet of first evaporator 15 is connected to the second inlet of reformer 17, the second outlet of reformer 17 is connected to the second inlet of second evaporator 18, and the second outlet of second evaporator 18 is connected to the atmosphere.

[0138] When the recycling efficiency enhancement system is running in mode one, separator 26 does not operate, and its workflow is the same as the basic system. Figure 4 The process is the same.

[0139] In Mode 2, the recovery and efficiency enhancement system operates as follows: Liquid methanol stored in liquid methanol storage tank 19 is pressurized to a set pressure by the first booster pump 20 and then transported to the first evaporator 15 to absorb heat and convert into methanol vapor. Subsequently, gaseous methanol enters the cracker 16 to absorb heat and convert into hydrogen, carbon monoxide, and hydrogen-rich synthesis gas containing unconverted methanol. Methanol-water solution stored in methanol-water solution storage tank 21 is pressurized to a set pressure by the second booster pump 22 and then enters the second evaporator 18 to absorb heat and convert into gaseous methanol-water solution. Subsequently, the gaseous methanol-water solution enters the reformer 17 to absorb heat and convert into hydrogen, carbon dioxide, and hydrogen-rich synthesis gas containing unconverted methanol. This portion of hydrogen-rich synthesis gas generated by the cracker 16 and reformer 17 is mixed and enters the separator 26 for methanol separation according to a set synthesis gas ratio.

[0140] At ambient temperature and pressure, air enters boiler 25 and mixes with hydrogen-rich syngas processed by separator 26 for combustion. The high-temperature combustion gas flows through the boiler's radiant and convective heating surfaces, transferring heat to the heating medium to complete the heating task. Subsequently, the high-temperature combustion gas sequentially enters cracker 16, first evaporator 15, reformer 17, and second evaporator 18 to provide heat, and is finally discharged into the atmosphere. Methanol separated by separator 26 is diverted as needed. When it is necessary to replenish the amount of methanol for the reforming reaction, control valve 28 and control valve 30 are closed, and control valve 29 is opened, allowing the separated methanol to enter reformer 17 to participate in the reforming reaction. When it is necessary to replenish the amount of methanol for the cracking reaction, control valve 29 and control valve 30 are closed, and control valve 28 is opened, allowing the separated methanol to enter cracker 16 to participate in the cracking reaction. When it is necessary to store this portion of methanol, control valve 28 and control valve 29 are closed, and control valve 30 is opened, allowing the methanol to enter methanol-water solution storage tank 21 for storage, thus completing one working cycle.

[0141] The methanol online cracking and reforming coupled waste heat deep recovery efficiency enhancement system in this embodiment solves the problem that the hydrogen-rich syngas supplied to the burner is still highly active syngas under the "heat preservation" or "low fire" conditions of the boiler with low combustion rate through the above-mentioned diversion control. This maintains the stability of the flame and the completeness of combustion, and avoids the low combustion efficiency, carbon deposits or safety risks that may occur under low load.

[0142] As a further optimization, in this embodiment, a fuel quality sensor is installed on the pipeline between the separator 26 and the combustion power system 3 to collect the Wobbe number information of the hydrogen-rich synthesis gas input to the combustion power system 3. The first evaporator 15 is connected to the input port of the eighth control valve 31 through a pipeline, and its output port is connected to the pipeline between the separator 26 and the fuel quality sensor through a pipeline.

[0143] In this embodiment, a fuel quality sensor can detect the Wobbe number information of the hydrogen-rich syngas input to the combustion power system 3. Based on the obtained Wobbe number information, the eighth control valve 31 is used to mix methanol vapor with the hydrogen-rich syngas, so that the composition of the hydrogen-rich syngas entering the combustion power system remains stable, avoiding fluctuations in the composition ratio of syngas due to external factors. This ensures that the composition and characteristics of the hydrogen-rich syngas input to the combustion power system 3 remain consistent, thereby improving the stability of the combustion process.

[0144] This embodiment addresses system fluctuations caused by external factors under stable operating conditions. It proposes a system structure based on Wobbe number detection and an active control strategy. By using high-precision closed-loop feedback to detect the Wobbe number information of hydrogen-rich syngas and the bypass adjustment mechanism of the eighth control valve 31, it compensates for fluctuations in the syngas composition ratio caused by external factors during methanol cracking and reforming reactions. This ensures that the syngas composition entering the combustion power system remains stable. Under this control strategy, a lower excess air coefficient and a more aggressive combustion strategy can be adopted, further improving the system's thermal efficiency while ensuring system safety and stability. It can also effectively control system emissions, achieving refined system control.

[0145] As a further optimization, in this embodiment, a mixer 32 is installed on the pipeline between the separator 26 and the fuel quality sensor, and the mixer 32 is connected to the output port of the eighth control valve 31.

[0146] In this embodiment, the mixer 32 is used in conjunction with a fuel quality sensor to mix the hydrogen-rich syngas output from the pyrolysis unit 16 and the reformer 17 in the mixer 32. Then, the Wobbe number information of the mixed gas is detected by the fuel quality sensor, which further improves the stability of the quality of the hydrogen-rich syngas fuel entering the combustion power system 3.

[0147] The recovery enhancement system in this embodiment provides a more advanced control scheme to eliminate fluctuations in pyrolysis and reforming conversion rates caused by environmental disturbances or minor changes in the internal state of the system, thereby supplying the combustion power system with fuel of highly uniform quality.

[0148] Please see Figure 9 , Figure 9This is a schematic diagram illustrating the Wobbe number adjustment in the recovery and efficiency enhancement system of this embodiment. The recovery and efficiency enhancement system includes a cracking system 1, a reforming system 2, a combustion power system 3, a methanol synthesis gas separation system 4, a fuel quality sensor, an eighth control valve 31, and a mixer 32. The structure of the system in this embodiment is similar to... Figure 5 The structures shown are basically the same, the difference being that a portion of uncracked methanol vapor is drawn out from the pipeline between the first evaporator 15 and the cracker 16 in the cracking system 1 and mixed with the separated hydrogen-rich syngas. This is to achieve active, closed-loop control of a key combustion characteristic of the final fuel (the hydrogen-rich syngas input to the combustion power system 3)—the Wobbe Index (WI). The Wobbe Index is an internationally recognized primary indicator characterizing the interchangeability of gaseous fuels. It integrates the calorific value and density of the fuel and directly determines the heat release rate corresponding to the fuel's volumetric flow rate under specific pressure and nozzle conditions. Its definition is:

[0149]

[0150] in, The Wobbe number is the fuel quantity, usually expressed in units of 1. , Because of the low calorific value of fuel gas by volume, The density of the fuel gas, This is the density of air under standard conditions.

[0151] In this embodiment, after the hydrogen-rich syngas generated from the cracking and reforming reactions are mixed at mixer 32, a fuel quality sensor installed on the pipeline can monitor the actual Wobbe number of the mixed hydrogen-rich syngas in real time. The system controller compares the pre-set optimal target Wobbe number with the actual measured Wobbe number, and uses advanced control algorithms such as PID (Proportional-Integral-Derivative) to calculate and output a control signal in real time based on the difference. This signal is then used to adjust the flow rate of uncracked methanol vapor diverted from the first evaporator 15 via the eighth control valve 31, thereby controlling the proportion of components in the final mixture. This proactive and rapid-response closed-loop feedback control ensures the stability and quality of fuel within the combustion power system, almost completely eliminating the impact of upstream operating condition fluctuations and noise on the downstream combustion process. This not only achieves ultimate combustion stability and efficiency but also simplifies the design requirements for the burner, greatly improving the reliability, responsiveness, and environmental adaptability of the entire energy system.

[0152] In this embodiment, the system for adjusting the IoDAR number using the recovery enhancement system is... Figure 5 Compared to the system, Figure 5The system solved the problem of operational stability of combustion power systems under "large-scale" load changes, and Figure 9 The system solves the problem of "small-scale" fuel quality fluctuations caused by minute disturbances under any given operating conditions.

[0153] 3.1 Application of Recovery Enhancement System for Wobbe Number Regulation in Gas Turbines

[0154] Please see Figure 10 , Figure 10 This is a schematic diagram illustrating the implementation of Wobbe number regulation in a gas turbine using the recovery and efficiency enhancement system of this embodiment. The recovery and efficiency enhancement system includes a pyrolysis system 1, a reforming system 2, and a combustion power system 3. The structures of the pyrolysis system 1, reforming system 2, and combustion power system 3 are similar to those of... Figure 6 The structure of the diversion system in the recovery efficiency enhancement system is similar, but in this embodiment, an eighth control valve 31, a mixer 32, and a fuel quality sensor are added.

[0155] In this embodiment, the connection and diversion of the recycling enhancement system are described. Figure 6 Similar to the example shown, the difference is:

[0156] Liquid methanol cracking path: The first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the first inlet of mixer 32, the outlet of mixer 32 is connected to the second inlet of combustion chamber 13, and the first outlet of first evaporator 15 is connected to the first inlet of mixer 32 through the eighth control valve 31.

[0157] Methanol-water solution reforming path: The first outlet of reformer 17 is connected to the first inlet of separator 26.

[0158] During system operation, in conjunction with the basic structure Figure 6 The difference lies in the addition of a fuel quality sensor to the mixer 32 or the pipeline between the mixer 32 and the combustion chamber 13, and the measured Wobbe value is fed back to the system controller. The system controller compares the actual value with the Wobbe number set value required for the optimal operating point of the gas turbine combustion chamber, and adjusts the opening of the eighth control valve 31 in real time and dynamically according to the deviation.

[0159] Through the above closed-loop feedback control design, a "standard fuel" of consistent quality can be provided for the gas turbine, completely isolating the impact of any fluctuation noise in the upstream pyrolysis process on the downstream combustion. This is of great significance for gas turbine systems that pursue ultimate performance, as it can bring the best combustion stability, the highest combustion efficiency, and the lowest harmful emissions.

[0160] 3.2 Application of the recovery efficiency enhancement system for Wobbe number regulation in internal combustion engines

[0161] Please see Figure 11 , Figure 11 This is a schematic diagram illustrating the implementation of Wobbe number regulation in a gas turbine using the recovery and efficiency enhancement system of this embodiment. The recovery and efficiency enhancement system includes a pyrolysis system 1, a reforming system 2, and a combustion power system 3. The structure and connections of the pyrolysis system 1, reforming system 2, and combustion power system 3 are shown. Figure 7 The structure of the diversion system in the recovery efficiency enhancement system is similar, but in this embodiment, an eighth control valve 31, a mixer 32, and a fuel quality sensor are added.

[0162] The connection and diversion of the recycling efficiency enhancement system in this embodiment Figure 7 Similar, the difference is:

[0163] Liquid methanol cracking path: The first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the first inlet of mixer 32, the outlet of mixer 32 is connected to the third inlet of internal combustion engine 23, and the first outlet of first evaporator 15 is connected to the first inlet of mixer 32 through the eighth control valve 31.

[0164] Methanol-water solution reforming path: The first outlet of reformer 17 is connected to the first inlet of separator 26;

[0165] During system operation, in conjunction with the basic structure Figure 7 The difference lies in the addition of a fuel quality sensor to the mixer 32 or the pipeline between the mixer 32 and the internal combustion engine 23, and feeding back the measured Wobbe value to the system controller. The system controller compares the actual value with the Wobbe number set value required for the optimal operating point of the combustion chamber of the internal combustion engine 23, and adjusts the opening of the eighth control valve 31 in real time and dynamically according to the deviation.

[0166] This embodiment ensures that the combustion process of the internal combustion engine is highly consistent in each power stroke through the above-mentioned closed-loop feedback control design, significantly reducing engine vibration and noise, improving the NVH (Noise, Vibration, and Harshness) performance of the internal combustion engine, and ensuring that the engine's electronic control unit can calibrate injection and ignition timing based on an absolutely stable fuel model, thereby pushing the engine to its limit operating point of highest efficiency and lowest emissions. It can also compensate in real time for the fluctuations caused by changes in ambient temperature and humidity, or even slight aging of the catalyst, on the cracking process, ensuring that the engine maintains optimal performance under any conditions.

[0167] 3.3 Application of the recovery and efficiency enhancement system for Wobbe number regulation in boilers

[0168] Please see Figure 11 , Figure 11This is a schematic diagram illustrating the implementation of Wobbe number regulation in a gas turbine using the recovery and efficiency enhancement system of this embodiment. The recovery and efficiency enhancement system includes a pyrolysis system 1, a reforming system 2, and a combustion power system 3. The structure and connections of the pyrolysis system 1, reforming system 2, and combustion power system 3 are shown. Figure 8 Similarly, this embodiment adds an eighth control valve 31, a mixer 32, and a fuel quality sensor.

[0169] In this embodiment, the connection and diversion of the recycling enhancement system are described. Figure 8 Similar, the difference is:

[0170] Liquid methanol cracking path: The first outlet of cracker 16 is connected to the first inlet of separator 26, the first outlet of separator 26 is connected to the first inlet of mixer 32, the outlet of mixer 32 is connected to the third inlet of boiler 25, and the first outlet of first evaporator 15 is connected to the first inlet of mixer 32 through the eighth control valve 31.

[0171] Methanol-water solution reforming path: The first outlet of reformer 17 is connected to the first inlet of separator 26;

[0172] During system operation, in conjunction with the basic structure Figure 8 The difference lies in the addition of a fuel quality sensor to the mixer 32 or the pipeline between the mixer 32 and the boiler 25, and feeding back the measured Wobbe value to the system controller. The system controller compares the actual value with the Wobbe number set value required for the optimal operating point of the boiler 25 combustion chamber, and adjusts the opening of the eighth control valve 31 in real time and dynamically according to the deviation.

[0173] This embodiment, through the aforementioned closed-loop feedback control design, anticipates extremely stable and predictable fuel performance. Therefore, the required air-fuel ratio for the boiler can be controlled at a very low level, close to the theoretical value. This ensures complete fuel combustion and sufficient air intake, reducing heat loss carried away by flue gas and directly improving boiler thermal efficiency. High-quality fuel also ensures the shape, size, and temperature distribution of the flame, which is beneficial for uniform heat transfer within the boiler, preventing localized overheating and extending the lifespan of equipment (such as water-cooled walls).

[0174] As a further optimization, in this embodiment, the first evaporator 15 is connected to the liquid methanol storage tank 19 through a pipeline, and a first booster pump 20 is installed on the pipeline to input liquid methanol into the first evaporator 15.

[0175] As a further optimization, in this embodiment, the combustion power system 3 is one of a gas turbine, an internal combustion engine 23, and a boiler 25. The combustion chambers of the gas turbine or internal combustion engine 23 and the boiler 25 are connected to the pyrolysis system 1 and the reforming system 2 in sequence through pipelines, so that the exhaust gas containing heat at medium and high temperature flows through the pyrolysis unit 16, the first evaporator 15, the reformer 17, and the second evaporator 18 in sequence.

[0176] As a further optimization, in this embodiment, when the combustion power system 3 is an internal combustion engine 23, the second evaporator 18 is connected to the three-way catalytic converter 24 through a pipe to purify the final exhaust gas output through the second evaporator 18.

[0177] As a further optimization, the C-H ratio of the methanol-water solution in this embodiment is in the range of 1:1 to 2.

[0178] The range of C-H ratios in the methanol-water solution in this embodiment allows the reforming reaction to achieve a high conversion rate.

[0179] Specifically, the carbon-to-hydrogen ratio of the methanol-water solution is 1:1.

[0180] Specifically, the carbon-to-hydrogen ratio of the methanol-water solution is 1:1.5.

[0181] Specifically, the carbon-to-hydrogen ratio of the methanol-water solution is 1:2.

[0182] The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system, characterized in that, include: The system includes a cracking system (1), a reforming system (2), and a combustion power system (3). Fuel is input into the combustion power system (3) to burn and release heat energy and exhaust medium- and high-temperature exhaust gas containing heat. The cracking system (1) includes a first evaporator (15) and a cracker (16). The cracker (16) is connected to the first evaporator (15) and the combustion power system (3) through pipes. The cracker (16) is filled with a methanol cracking catalyst. The combustion power system (3) discharges medium-high temperature exhaust gas containing heat through pipes, which flows through the cracker (16) and the first evaporator (15) in sequence and is discharged. Liquid methanol is input into the first evaporator (15) and heated to evaporate into methanol vapor. The methanol vapor enters the cracker (16) and is heated to undergo a cracking reaction to generate hydrogen-rich synthesis gas. The reforming system (2) includes a reformer (17) and a second evaporator (18). The reformer (17) is connected to the first evaporator (15) and the second evaporator (18) through pipes. The low-temperature exhaust gas containing heat discharged from the first evaporator (15) flows through the reformer (17) and the second evaporator (18) in sequence through pipes. The methanol aqueous solution is input into the second evaporator (18) and evaporated into a gaseous methanol aqueous solution. The gaseous methanol aqueous solution enters the reformer (17) and undergoes a reforming reaction to generate hydrogen-rich synthesis gas. The hydrogen-rich synthesis gas generated in the reformer (17) and the cracker (16) is input into the combustion power system (3) through pipes for combustion. It also includes: a methanol synthesis gas separation system (4), which is located between the cracking system (1), the reforming system (2) and the combustion power system (3). The hydrogen-rich synthesis gas generated by the reformer (17) and the cracker (16) is input into the methanol synthesis gas separation system (4) to separate the uncracked and unreformed methanol gas from the hydrogen-rich synthesis gas, and then input the hydrogen-rich synthesis gas into the combustion power system (3). The methanol synthesis gas separation system (4) includes a separator (26), a fifth control valve (28), and a sixth control valve (29). The separator (26) is connected to the cracker (16) of the cracking system (1), the reformer (17) of the reforming system (2), and the combustion power system (3) through pipelines. One end of the fifth control valve (28) and the sixth control valve (29) are connected to the separator (26), and the other end is connected to the cracker (16) and the reformer (17), respectively, so that the separated methanol gas can be cracked and reformed again. The combustion power system (3) is one of a gas turbine, an internal combustion engine (23) and a boiler (25). The combustion chamber of the gas turbine, internal combustion engine (23) or boiler (25) is connected to the pyrolysis system (1) and the reforming system (2) in sequence through pipelines, so that the exhaust gas containing heat at medium and high temperature flows through the pyrolysis unit (16), the first evaporator (15), the reformer (17) and the second evaporator (18) in sequence.

2. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 1, characterized in that, The separator (26) is connected to the methanol aqueous solution storage tank (21) through a pipeline, and a seventh control valve (30) and a condenser (27) are sequentially installed on the pipeline along the direction of methanol gas flow to condense the separated methanol gas. The methanol aqueous solution storage tank (21) is connected to the second evaporator (18) through a pipeline, and a second booster pump (22) is installed on the pipeline to input the methanol aqueous solution into the second evaporator (18).

3. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 1, characterized in that, A fuel quality sensor is installed on the pipeline between the separator (26) and the combustion power system (3) to collect the Wobbe number information of the hydrogen-rich synthesis gas input to the combustion power system (3). The first evaporator (15) is connected to the input port of the eighth control valve (31) through a pipeline, and its output port is connected to the pipeline between the separator (26) and the fuel quality sensor through a pipeline.

4. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 3, characterized in that, A mixer (32) is installed on the pipeline between the separator (26) and the fuel quality sensor, and the mixer (32) is connected to the output port of the eighth control valve (31).

5. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 1, characterized in that, The first evaporator (15) is connected to the liquid methanol storage tank (19) through a pipeline, and a first booster pump (20) is installed on the pipeline to input liquid methanol into the first evaporator (15).

6. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 1, characterized in that, When the combustion power system (3) is an internal combustion engine (23), the second evaporator (18) is connected to the three-way catalytic converter (24) through a pipe to purify the final exhaust gas output through the second evaporator (18).

7. The methanol online cracking and reforming coupled waste heat deep recovery and efficiency enhancement system according to claim 1, characterized in that, The carbon-hydrogen ratio of the methanol-water solution is in the range of 1:1 to 2.

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