Catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis

Abstract

The invention discloses a catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis. The catalytic reaction system comprises a co-pyrolysis reaction furnace, a zero-carbon fuel pretreatment device, a straw treatment device, a condensation collection device and a heat energy recovery device, the co-pyrolysis reaction furnace is provided with a microwave generator, and the zero-carbon fuel pretreatment device and the straw treatment device are respectively communicated with the co-pyrolysis reaction furnace; the condensation collection device comprises a condensation box communicated with the co-pyrolysis reaction furnace through a smoke exhaust pipe, a condensation pipe arranged in the condensation box, an oil collection tank communicated with the condensation pipe and a gas collection tank communicated with the condensation box, and the heat energy recovery device comprises a water tank forming a circulation loop with the condensation pipe and one or more preheating water pipes led out of the circulation loop. And the heat exchange section of the preheating water pipe is arranged in the interior or the shell of the pretreatment device and the straw treatment device. Heat energy of oil gas is recycled, zero-carbon fuel and straw are preheated, the pyrolysis efficiency is improved, and meanwhile resource waste can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass pyrolysis, and particularly relates to a catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis. BACKGROUND

[0002] With the continuous growth of global energy demand and the increasingly serious environmental pollution and carbon emission problems caused by the use of fossil fuels, the development and utilization of renewable and clean biomass energy has become an important research direction in the energy field. Among them, agricultural wastes such as corn straw are considered as a very potential biomass resource due to their huge output and wide sources. Traditional straw disposal methods (such as open burning) not only cause serious air pollution, but also result in resource waste.

[0003] Catalytic pyrolysis technology can convert biomass such as straw into high-value-added hydrogen-rich gas, bio-oil and biochar, which is an effective way to realize the resource utilization of biomass. In order to further improve the quality of pyrolysis products and the energy efficiency of the whole process, co-pyrolysis technology emerges as the times require. This technology introduces other zero-carbon fuels (such as waste plastics, algae or other biomass) to react with straw, utilizes the interaction between different materials to improve the product distribution and increase the yield of target products such as hydrogen.

[0004] However, in the related art, the biomass co-pyrolysis technology in the related art, the high-temperature oil gas generated by the pyrolysis reaction carries a large amount of residual heat, and in the subsequent condensation process, this part of heat energy is usually not effectively recovered but directly dissipated, causing energy waste and increasing the system operation cost. The straw and zero-carbon fuel before entering the reactor are usually at ambient temperature, and direct pyrolysis requires a large amount of additional energy for heating, which affects the overall thermal efficiency. SUMMARY

[0005] The present application aims to at least partially solve one of the problems in the related art.

[0006] To this end, an embodiment of the present application proposes a catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis.

[0007] The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to an embodiment of the present application comprises: a co-pyrolysis reaction furnace, a microwave generator is arranged at the bottom or side of the co-pyrolysis reaction furnace, and a feed inlet is arranged at the top of the co-pyrolysis reaction furnace; a zero-carbon fuel pretreatment device, a first conveying mechanism is arranged between the discharge end of the zero-carbon fuel pretreatment device and the feed inlet of the co-pyrolysis reaction furnace; a straw treatment device, a second conveying mechanism is arranged between the discharge end of the straw treatment device and the feed inlet of the co-pyrolysis reaction furnace; A condensation collection device, comprising a condensation box connected to the co-pyrolysis reactor via a flue pipe, a condensation pipe disposed in the condensation box, an oil collection tank connected to the outlet of the condensation pipe, and a gas collection tank connected to the gas outlet of the condensation box. A heat recovery device includes a water tank forming a circulation loop with the condenser tube, and one or more preheated water pipes leading out from the circulation loop; the heat exchange sections of the preheated water pipes are respectively located inside or in the shell of the zero-carbon fuel pretreatment device and the straw treatment device, for preheating the materials therein.

[0008] In some embodiments, the heat exchange section of the preheated water pipe is integrated in the outer wall cavity of the zero-carbon fuel pretreatment device and the straw treatment device in the form of a coil or jacket.

[0009] In some embodiments, the zero-carbon fuel pretreatment device includes a zero-carbon fuel crusher and a zero-carbon fuel extruder connected in sequence, and the first conveying mechanism is a belt conveyor.

[0010] In some embodiments, a branch of the preheating water pipe has its heat exchange section located in the outer wall cavity of the zero-carbon fuel crusher.

[0011] In some embodiments, the straw processing device includes a straw crusher, and the second conveying mechanism is a screw conveyor.

[0012] In some embodiments, a branch of the preheated water pipe has its heat exchange section located in the outer wall cavity of the straw crusher.

[0013] In some embodiments, the co-pyrolysis reactor is equipped with a mechanical stirring device for mixing zero-carbon fuel and straw.

[0014] In some embodiments, there are multiple microwave generators arranged around the sidewalls of the co-pyrolysis reactor.

[0015] In some embodiments, the condenser tubes are arranged in a serpentine coil within the condenser box.

[0016] In some embodiments, the system further includes a water pump connected to the water tank and the preheated water pipe loop for driving the circulation of water.

[0017] The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis in this invention utilizes the waste heat from the high-temperature oil and gas generated during pyrolysis to directly preheat the raw materials through a preheating water pipe. This transforms traditionally wasted low-grade energy into valuable pretreatment energy, significantly reducing external energy input (especially the power consumption of the microwave generator) and directly lowering operating costs. The raw materials (zero-carbon fuel and straw) are preheated before entering the co-pyrolysis reactor, significantly shortening the heating time within the furnace and accelerating the pyrolysis reaction rate. This allows for the processing of more raw materials or the acquisition of more products within the same timeframe. Attached Figure Description

[0018] Fig. 1 This is a first schematic diagram of the catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to an embodiment of the present invention.

[0019] Fig. 2 This is a second schematic diagram of the catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to an embodiment of the present invention.

[0020] Fig. 3 This is a third schematic diagram of the catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to an embodiment of the present invention.

[0021] Figure label: 1-Co-pyrolysis reactor; 2-Gas collection tank; 3-Water tank; 4-Exhaust pipe; 5-Microwave generator; 6-Zero-carbon fuel extrusion molding machine; 7-Zero-carbon fuel crusher; 8-Condensation box; 9-Condensation pipe; 10-Oil collection tank; 11-Straw crusher; 12-Screw conveyor; 13-Belt conveyor; 14-Preheating water pipe. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0024] like Figs. 1 to 3 As shown, the catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis in this embodiment of the invention includes a co-pyrolysis reactor 1, a zero-carbon fuel pretreatment device, a straw treatment device, a condensation collection device, and a heat recovery device.

[0025] The co-pyrolysis reactor 1 has a feed inlet at the top and a microwave generator 5 at the bottom or side. As the heart of the system, the co-pyrolysis reactor 1 is where the core chemical reaction—catalytic co-pyrolysis—takes place. It is responsible for receiving pretreated materials and, under the action of microwave energy, converting them into high-value-added products.

[0026] The discharge end of the zero-carbon fuel pretreatment device is connected to the feed inlet of the co-pyrolysis reactor 1 via a first conveying mechanism. The zero-carbon fuel pretreatment device prepares qualified zero-carbon fuel raw materials for co-pyrolysis. By crushing to increase the specific surface area, and by extrusion molding to ensure that the material has a uniform bulk density and porosity in the reactor, the uniformity of microwave heating, stable material flow, and optimized synergistic reaction effect with straw are guaranteed.

[0027] The discharge end of the straw processing device is connected to the feed inlet of the co-pyrolysis reactor 1 via a second conveying mechanism. The straw processing device prepares qualified straw raw materials for co-pyrolysis. The crushing action is crucial; it breaks down the tough fiber structure of the straw, greatly increases the reaction contact area, and promotes the pyrolysis reaction.

[0028] The condensation and collection device includes a condenser box 8 connected to the co-pyrolysis reactor 1 via an exhaust pipe 4, condenser tubes 9 located inside the condenser box 8, an oil collection tank 10 connected to the outlet of the condenser tubes 9, and a gas collection tank 2 connected to the gas outlet of the condenser box 8. The condensation and collection device separates and collects gaseous reaction products. The condenser box 8 and condenser tubes 9 act as heat exchangers and separators, using cooling water to condense condensable components (bio-oil) from the high-temperature oil and gas. The oil collection tank 10 collects the liquid product bio-oil, and the gas collection tank 2 collects non-condensable hydrogen-rich gases, etc.

[0029] The heat recovery device includes a water tank 3 forming a circulation loop with the condenser 9, and one or more preheated water pipes 14 leading out from the circulation loop. The heat exchange sections of the preheated water pipes 14 are respectively located inside or outside the zero-carbon fuel pretreatment device and the straw treatment device, and are used to preheat the materials therein. The heat recovery device realizes the energy closed loop and energy efficiency improvement of the system. It includes two key functions: waste heat capture, in which the system actively and purposefully absorbs the heat of high-temperature oil and gas during the condensation process, instead of letting it dissipate; and energy reuse, in which the captured heat is directly used to preheat the raw materials, fundamentally reducing the energy consumption burden of the main reactor.

[0030] The zero-carbon fuel pretreatment and straw co-pyrolysis catalytic reaction system of this invention changes the physical form and structure of the raw materials through physical means (crushing, shaping, and pulverizing), creating the necessary conditions for subsequent efficient and uniform co-pyrolysis.

[0031] Microwave heating is a volumetric heating method that can instantly penetrate materials, heating them simultaneously from the inside out, resulting in extremely high thermal efficiency. In the presence of a catalyst, zero-carbon fuel and straw undergo a synergistic pyrolysis reaction. Zero-carbon fuel typically acts as a hydrogen donor, while straw serves as a carbon source; their co-pyrolysis promotes each other, effectively inhibiting coke formation while simultaneously improving the quality of bio-oil and the yield of hydrogen-rich gas. The general reaction formula can be simplified as: Biomass + Zero-carbon Fuel -- (Microwave, Catalyst) --> Bio-oil + Hydrogen-rich Gas + Biochar.

[0032] The system adheres to the energy-saving principles of temperature matching and tiered utilization. High-grade energy (microwave energy) is directly used to drive the high-temperature pyrolysis chemical reaction. Medium- and low-grade energy is recovered; the heat from the high-temperature oil and gas produced in the reaction (which still has a relatively high calorific value) is first used to complete the primary function of condensation and separation. Subsequently, the heat energy contained in the already heated cooling water (now hot water) is used again to complete the low-temperature heating task of preheating the raw materials. This forms a high-to-low energy utilization chain, greatly reducing the loss of effective energy.

[0033] The zero-carbon fuel pretreatment and straw co-pyrolysis catalytic reaction system of this invention achieves closed-loop energy utilization within the system. Waste heat that would otherwise be lost to the environment is recovered and used for raw material preheating, directly reducing the system's external energy input requirements and significantly improving overall energy efficiency.

[0034] The zero-carbon fuel pretreatment and straw co-pyrolysis catalytic reaction system of this invention reduces the heat load of the main reactor. Since the raw materials are preheated before entering the reactor, the microwave generator 5 only needs to provide less energy to bring the materials to the reaction temperature, thereby saving electrical energy and improving the pyrolysis rate and efficiency.

[0035] The zero-carbon fuel pretreatment and straw co-pyrolysis catalytic reaction system of this invention achieves a high degree of synergy between material flow and energy flow through mechanical structure and pipeline connection. The entire system is upgraded from a simple linear process (pretreatment → reaction → collection) to a cyclic process, in which the condenser not only handles separation but also acts as a preheater. This integrated design makes energy saving an inherent attribute of the system, rather than a function added later.

[0036] In summary, this invention, through its unique mechanical structure design, integrates the pretreatment of zero-carbon fuel and straw, microwave co-pyrolysis, product separation, and, most importantly, energy recovery and reuse into a cohesive whole. It not only efficiently produces clean energy sources such as bio-oil and hydrogen-rich gas, but more importantly, through internal energy cycling, it significantly reduces the energy consumption and operating costs per unit of energy produced, making biomass co-pyrolysis technology more competitive in terms of both economy and environmental friendliness.

[0037] In some embodiments, the heat exchange section of the preheated hot water pipe 14 is integrated in the outer wall cavity of the zero-carbon fuel pretreatment device and the straw treatment device in the form of a coil or jacket.

[0038] Understandably, both coiled and jacketed structures significantly increase the contact area between the hot water and the inner wall of the pretreatment unit's outer shell. A larger heat exchange area means that heat energy can be transferred to the unit's shell more quickly and evenly.

[0039] For example, coils maximize heat exchange area within a limited space through a meandering pipe layout. The jacket forms a closed cavity, allowing hot water to have extensive contact with the outer wall of the entire unit.

[0040] The efficient heat exchange ensures that the zero-carbon fuel and straw are fully and evenly heated during the crushing / pulverizing process, avoiding localized cold spots and ensuring that they enter the reactor at a high and uniform temperature.

[0041] Hot water does not come into direct contact with the materials; heat is conducted only through the metal casing. This prevents impurities in the circulating water from contaminating the raw materials, or dust and debris from the raw materials from contaminating and clogging the water system. This maintains the purity of the products (bio-oil, fuel gas) and the cleanliness of the hot water system. The crushers and pulverizers contain high-speed moving mechanical parts. If water pipes were to pass directly through the material handling area, there is a risk of pipe wear and rupture leading to leaks, which could damage equipment and cause safety accidents. Indirect heating completely avoids this risk.

[0042] In some embodiments, such as Figs. 1 to 3 As shown, the zero-carbon fuel pretreatment device includes a zero-carbon fuel crusher 7 and a zero-carbon fuel extruder 6 connected in sequence.

[0043] The zero-carbon fuel crusher 7 crushes large pieces of zero-carbon fuel (such as waste plastics, biomass briquettes, etc.) into small pieces or particles, greatly increasing the contact area between the material and the heat source (microwave) and potential catalyst, thereby significantly accelerating the pyrolysis reaction rate and improving conversion efficiency.

[0044] Uniform and appropriately sized fragments are a prerequisite for stable, high-quality extrusion molding. Directly extruding large, irregular pieces of material can easily lead to uneven molding, significant density differences, and even equipment damage. Crushers provide suitable raw materials for this purpose.

[0045] By installing coils or jackets inside the outer cavity of the crusher, the material is preheated while being crushed, thus integrating the physical change and heat input processes and improving overall energy efficiency.

[0046] The zero-carbon fuel extrusion molding machine 6 unifies material morphology and optimizes microwave heating. Microwave heating is highly sensitive to the shape, size, and density of materials. Irregular materials can lead to uneven heating, creating hot or cold spots. Through extrusion molding, fuel blocks with uniform size, shape, and density can be produced. This ensures that microwave energy is absorbed evenly, avoiding localized overheating or incomplete reactions, thereby improving product quality and consistency. This is crucial for the efficient and stable conduct of the co-pyrolysis reaction.

[0047] After being shaped, zero-carbon fuel is mixed with loose, fluffy straw powder to form a reaction bed with ideal porosity. The fuel blocks act as a framework, with the straw powder filling the spaces between them. This structure facilitates the release of volatiles and secondary reactions, forming a crucial physical basis for achieving the synergistic effect of co-pyrolysis. The shaped, regular block-like materials (such as granules or strips) are ideally suited for stable and continuous transport using a belt conveyor 13.

[0048] The first conveying mechanism is a belt conveyor 13. The zero-carbon fuel exiting the extruder is a solid block with a certain mechanical strength. The belt conveyor 13 is very suitable for horizontal or slightly inclined conveying of this type of shaped solid material. Its conveying process is smooth and continuous, with minimal wear and breakage of the material, and can deliver the shaped fuel intact into the reactor. The belt conveyor 13 can achieve a large-capacity, uninterrupted material flow, which is highly compatible with the requirement of continuous feeding of the co-pyrolysis reactor 1 to maintain stable operating conditions.

[0049] Furthermore, a branch of the preheating water pipe 14 sets its heat exchange section in the outer wall cavity of the zero-carbon fuel crusher 7.

[0050] Many zero-carbon fuels (such as certain plastics or dry biomass) are hard and tough at low temperatures. By incorporating a heat exchange section within the outer wall cavity to heat the crusher shell, the temperature of the material to be crushed inside is indirectly raised. When heated, the material's hardness and toughness typically decrease, becoming more brittle and easier to crush. This directly reduces wear on the crusher blades and the workload on the motor, thereby saving energy and extending equipment life. This is not only heat recovery but also an optimization of the pretreatment process itself.

[0051] In some embodiments, such as Figs. 1 to 3 As shown, the straw processing device includes a straw crusher 11. Straw, as a typical biomass, is characterized by its tough, loose, low-density, and poor flowability fiber structure. The crusher's function is to completely change its inherent form through physical means to meet the stringent requirements of the co-pyrolysis process.

[0052] The straw crusher 11 pulverizes loose straw into fine, uniform powder. This powdered straw mixes better with the formed zero-carbon fuel blocks, filling the gaps between the fuel blocks to form a fixed bed with suitable porosity. This facilitates the smooth extraction of pyrolysis steam, reduces secondary cracking into coke, and thus increases bio-oil yield. The finely pulverized straw and the zero-carbon fuel with hydrogen-donating potential achieve closer contact, enabling more efficient transfer and exchange of hydrogen free radicals. This is the core mechanism by which co-pyrolysis improves product quality.

[0053] The second conveying mechanism is a screw conveyor 12. The screw conveyor 12 propels powdery or granular materials forward through the rotation of its helical blades. The screw conveyor 12 is particularly suitable for conveying loose, low-density, and easily dusty materials such as straw powder, effectively preventing dust escape, maintaining a clean working environment, and avoiding material loss. By adjusting the screw speed, the amount of straw entering the reactor can be precisely controlled, thus achieving the optimal ratio with the zero-carbon fuel feed rate.

[0054] Furthermore, a branch of the preheated water pipe 14 has its heat exchange section located in the outer wall cavity of the straw crusher 11. Dry straw fibers are extremely tough, and direct mechanical crushing requires a large amount of energy. By setting a heat exchange section in the outer wall cavity of the straw crusher 11, the machine casing is heated, indirectly raising the temperature of the internal straw raw material.

[0055] In some embodiments, the co-pyrolysis reactor 1 is equipped with a mechanical stirring device for mixing zero-carbon fuel and straw.

[0056] Mechanical mixing devices can be paddle mixers, typically consisting of two or more straight or inclined blades driven by a central shaft. They are ideal for mixing solid materials with significant differences in density and shape, such as shaped zero-carbon fuel blocks with loose straw powder. Their robust structure effectively pushes and turns the materials, preventing clumping.

[0057] A mechanical stirring device is installed in the co-pyrolysis reactor 1 to achieve initial uniform mixing of materials. Microwave heating is prone to generating hot spots due to uneven material density. The stirring device continuously agitates and breaks up any possible material agglomerations, creating a reaction bed with uniform physical properties, thereby avoiding localized overheating or incomplete reaction.

[0058] In some embodiments, there are multiple microwave generators 5 arranged around the sidewall of the co-pyrolysis reactor 1.

[0059] Understandably, a single microwave generator 5 may create an uneven electromagnetic field distribution within the furnace, resulting in some areas having high temperatures (hot spots) and others having low temperatures (cold spots). By arranging multiple microwave sources around the sidewalls of the co-pyrolysis reactor 1, the microwaves emitted by these sources superimpose and interfere with each other within the furnace, forming a more uniform overall electromagnetic field. This ensures that materials throughout the furnace reach the reaction temperature, preventing some materials from failing to react completely due to insufficient heating, thereby improving the overall conversion rate and product yield.

[0060] In some embodiments, the condenser tubes 9 are arranged in a serpentine coil within the condenser box 8. The serpentine coils, through their meandering and compact arrangement, maximize the length of the pipes within a given space. This achieves the most efficient heat exchange between high-temperature oil / gas and cooling water within the limited volume of the condenser box 8.

[0061] A larger heat exchange area means that more heat energy can be transferred from the high-temperature oil and gas to the cooling water per unit time, thereby accelerating the condensation process of the oil and gas. Rapid condensation can reduce the loss of volatile components due to excessive residence time and escape with non-condensable gases, ensuring that more bio-oil is recovered and improving the yield of the target product.

[0062] In some embodiments, the system further includes a water pump connected to the water tank 3 and the preheated water pipe 14 loop for driving the circulation of water. The water pump can be a centrifugal pump, providing a stable and continuous flow rate, which is very suitable for this closed-loop circulation, heat transfer-dominated operating condition.

[0063] Understandably, in a natural convection system without a pump, the water flow is slow and unstable, resulting in low heat transfer efficiency. The core purpose of installing a pump is to transform passive, inefficient natural flow into active, efficient, and controllable flow. This ensures a sufficiently fast water flow through the condenser tube 9 to quickly remove heat and maintain efficient condensation. Only a stable, high-speed water flow can continuously transfer heat from the condenser tank 8 to the distant pretreatment equipment, something natural convection cannot achieve.

[0064] 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," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis, characterized in that, include: A co-pyrolysis reactor (1) is provided with a feed inlet at the top and a microwave generator (5) at the bottom or side of the co-pyrolysis reactor (1). A zero-carbon fuel pretreatment device, wherein the discharge end of the zero-carbon fuel pretreatment device is connected to the feed port of the co-pyrolysis reactor (1) through a first conveying mechanism; The straw processing device has its discharge end connected to the feed inlet of the co-pyrolysis reactor (1) via a second conveying mechanism. The condensation collection device includes a condensation box (8) connected to the co-pyrolysis reactor (1) via a flue pipe (4), a condensation pipe (9) disposed in the condensation box (8), an oil collection tank (10) connected to the outlet of the condensation pipe (9), and a gas collection tank (2) connected to the gas outlet of the condensation box (8). The heat recovery device includes a water tank (3) forming a circulation loop with the condenser (9), and one or more preheating water pipes (14) leading out from the circulation loop; the heat exchange section of the preheating water pipe (14) is respectively located inside or in the shell of the zero-carbon fuel pretreatment device and the straw treatment device, for preheating the materials therein.

2. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, The heat exchange section of the preheated water pipe (14) is integrated in the outer wall cavity of the zero-carbon fuel pretreatment device and the straw treatment device in the form of a coil or jacket.

3. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, The zero-carbon fuel pretreatment device includes a zero-carbon fuel crusher (7) and a zero-carbon fuel extruder (6) connected in sequence, and the first conveying mechanism is a belt conveyor (13).

4. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 3, characterized in that, A branch of the preheating water pipe (14) sets its heat exchange section in the outer wall cavity of the zero-carbon fuel crusher (7).

5. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, The straw processing device includes a straw crusher (11) and the second conveying mechanism is a screw conveyor (12).

6. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 5, characterized in that, A branch of the preheating water pipe (14) has its heat exchange section located in the outer wall cavity of the straw crusher (11).

7. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, The co-pyrolysis reactor (1) is equipped with a mechanical stirring device for mixing zero-carbon fuel and straw.

8. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, Multiple microwave generators (5) are arranged around the side wall of the co-pyrolysis reactor (1).

9. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to claim 1, characterized in that, The condenser tube (9) is arranged in a serpentine coil inside the condenser box (8).

10. The catalytic reaction system for zero-carbon fuel pretreatment and straw co-pyrolysis according to any one of claims 1-9, characterized in that, The system also includes a water pump connected in a loop to the water tank (3) and the preheated water pipe (14) for driving the flow of circulating water.

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