Solar dual-reforming reactor with edge energy flow recovery configuration

Abstract

The invention discloses an edge energy flow recovery configuration solar dual-reforming reactor, and relates to a methane reforming reactor. And the segmented efficient utilization of non-uniform radiation energy in Gaussian distribution heat flow by the solar reforming reactor is realized. According to the technical scheme, the device comprises a reactor and a heat insulation layer wrapping the reactor, one end of the reactor is a solar radiation energy flow receiving end, and the other end of the reactor is a gas inlet and outlet end; an annular thin plate is further embedded in the reactor, the axial length of the annular thin plate is smaller than that of the reactor, the annular thin plate extends to the gas inlet and outlet end, and the gas inlet and outlet end is divided into a reaction gas inlet located on the outer side of the annular thin plate and a synthesis gas outlet located on the inner side of the annular thin plate through the annular thin plate. By means of the design, the utilization efficiency of Gaussian distribution type condensation energy flow is improved, effective recycling of Gaussian distribution edge low condensation energy flow is achieved, and the overall temperature and temperature uniformity of fluid in the reactor are effectively improved through the optimized structure.

Description

Technical Field

[0001] The invention relates to a methane reforming reactor, in particular to a solar-driven methane double reforming reactor with an edge energy flow recovery configuration. Background Art

[0002] Currently, solar-driven methane double reforming (CH4+CO2+H2O→H2+CO) is a synergistic technology for achieving carbon emission reduction and clean fuel production, meeting the significant demand for solar thermochemical energy storage and fuel preparation. It can efficiently utilize solar energy to convert greenhouse gases (CH4 / CO2) into high-value-added synthesis gas (H2 / CO), which is of great significance for environmental protection and the circular economy. However, this reforming reaction process is energy-intensive, and existing reactor designs, which focus on enhancing heat and mass transfer within porous media, have difficulty fully adapting to and efficiently utilizing the non-uniform (Gaussian) distribution characteristics of concentrated solar radiation. Summary of the Invention

[0003] In response to the above problems, the present invention proposes a solar double reforming reactor with edge energy flow recovery configuration, which realizes the segmented and efficient utilization of uneven radiation energy in Gaussian distributed heat flow by the solar reforming reactor.

[0004] The technical solution of the present invention is as follows: comprising a reactor 1 and a heat-insulating layer 2 wrapped around the outside of the reactor 1, wherein one end of the reactor 1 is a solar radiation energy flow receiving end 6, and the other end is a gas inlet and outlet end; The reactor 1 also has an annular thin plate 4 embedded therein. The annular thin plate 4 has an axial length smaller than that of the reactor 1 and extends to the gas inlet and outlet. The gas inlet and outlet are separated by the annular thin plate 4 into a reaction gas inlet 3 on the outside of the annular thin plate 4 and a synthesis gas outlet 5 on the inside of the annular thin plate 4.

[0005] Regarding the selection of materials for reactors and thermal insulation layers: The internal structure of the reactor 1 is a porous medium structure, the porosity of the porous medium structure varies in the range of 0.80-0.93, and the average pore diameter is 2 mm.

[0006] The porous medium structure is made by 3D printing of copper, nickel and a high-temperature alloy containing these two elements.

[0007] The reactor 1 further includes an inner catalyst coated on a porous medium structure, wherein the catalyst is a catalyst based on Ni, Co, Si, Cu, Al, Ag or Rh.

[0008] The heat insulation layer 2 is a ceramic fiber product composed of aluminum oxide and silicon dioxide.

[0009] Regarding the dimensions of the reactor and its internal annular plate: The reactor 1 is cylindrical in shape, with a diameter of D is 2 cm, the cylinder height H is 2 cm.

[0010] The annular thin plate 4 is a cylindrical thin plate with a solid structure. The thickness of the annular thin plate is d c The height of the top of the reactor is 0.25 mm. h is 2 mm, the inner radius of the thin plate R is 13 mm.

[0011] By optimizing the structural design and installing an annular thin plate in the reactor based on the actual requirements of the solar-driven methane dual reaction, the present invention improves the utilization rate of the low-radiation heat flux at the edge, reduces the temperature non-uniformity of the fluid in the reactor, and improves the reaction gas conversion rate and system efficiency. Compared with traditional reactor configurations, this invention has the following significant advantages: 1. The overall temperature of the fluid in the reactor is higher, the temperature distribution is more uniform, the reforming reaction rate is faster, and the conversion rate of the reactants is higher within the same residence time; Second, it makes full use of the uneven (Gaussian distribution) concentrated solar heat flow, using the low energy flow at the edge to indirectly preheat and keep the fluid warm, while the high energy flow in the center is used for centralized heating and supply reaction.

[0012] In general, the present invention is suitable for solar dish-type concentrating systems. The reactor utilizes a porous medium structure (porous foam) as the reaction bed and incorporates an annular thin-plate flow guide structure (h = 2 mm, R = 13 mm). The reactant gases flow into the rear edge of the reactor and undergo reforming reactions within the pores of the porous medium structure. The resulting syngas then flows out from the center of the rear end of the reactor. This design improves the utilization efficiency of the Gaussian-distributed concentrated energy flux and effectively recycles the low-concentration energy flux at the edge of the Gaussian distribution. The optimized structure effectively improves the overall temperature and temperature uniformity of the fluid within the reactor, enhancing heat and mass transfer performance, thereby increasing the reactant gas conversion rate and system efficiency. Under a simulated light intensity of 130.8 W, the reactor described in this invention achieved a solar-to-chemical energy conversion efficiency of 43.47%. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an axial half-section view of the present invention; wherein 1 is a reactor, 2 is a heat insulation layer, 3 is a reaction gas inlet, 4 is an annular thin plate, 5 is a synthesis gas outlet, and 6 is a solar radiation energy flow receiving end.

[0014] Figure 2 7 is the external structure diagram of the present invention; wherein 7 is the raw gas inlet pipe, and 8 is the synthesis gas outlet pipe.

[0015] Figure 3 This is a performance comparison chart of the present invention and traditional reactors at different inlet flow rates, and a comparison chart of reaction gas conversion rate and light-to-combustion efficiency (solar energy-to-chemical energy conversion efficiency). Figure 4 This is a comparison chart of the average fluid temperature of the present invention and the traditional reactor. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of this patent, this patent is described in detail below through specific implementation methods and in combination with its accompanying drawings.

[0017] like Figure 1 As shown, the edge energy flow recovery configuration solar dual reactor includes a reactor 1 and a thermal insulation layer 2. The front end of the reactor 1 is a solar radiation energy flow receiving end 6, the rear edge is a reaction gas inlet 3, and the middle of the rear end is a synthesis gas outlet 5. There is an annular thin plate 4 inside the reactor. The annular thin plate 4 is provided to separate the gas inlet and outlet, so that the reaction gas enters the reactor from the rear end, undergoes heating and reaction in the front section, and then flows out from the rear end. This design is mainly to utilize the uneven Gaussian heat flow in a graded manner, and use the low-quality radiation energy flow near the edge for preheating and heat preservation. At the same time, it strengthens the heat exchange inside the reactor, increases the overall temperature inside the reactor, and then expands the high-temperature zone, thereby improving the reaction gas conversion rate and system efficiency.

[0018] The working process is as follows: gas is fed in through the raw gas inlet pipe 7 connected to the reaction gas inlet 3, and gas is led out through the synthesis gas outlet pipe 8 connected to the synthesis gas outlet 5.

[0019] Specifically, a mixture of methane, carbon dioxide, and water vapor enters reactor 1 through inlet 2 at the rear edge, undergoes initial heating and reaction on the outside of annular plate 4, and further heats and reacts on the inside of annular plate 4 at the center of reactor 1. Finally, the synthesis gas flows out through synthesis gas outlet 5 in the middle of the rear end. The presence of annular plate 4 within reactor 1 allows for graded heating, which improves the utilization of uneven Gaussian heat flux. This also enhances internal heat exchange, raising the overall temperature and temperature uniformity within the reactor, resulting in better reaction gas conversion and system efficiency.

[0020] Figure 2The study shows that as porosity increases, the methane conversion rate, carbon dioxide conversion rate, light-to-fuel efficiency, and hydrogen-to-carbon ratio of the new configuration increase for both the present invention and the conventional configuration. The new configuration's methane conversion rate, hydrogen-to-carbon ratio, and solar-to-chemical energy conversion efficiency are higher than those of the conventional configuration, but the effect on carbon dioxide conversion is not significant. Carbon dioxide conversion is affected by the dry reforming reaction rate and the water-gas reaction, with higher fluid temperatures having a greater impact on the water-gas reaction. Therefore, within the studied range, there is no significant improvement in carbon dioxide conversion compared to the conventional configuration. This is well illustrated by the higher hydrogen-to-carbon ratio of the new configuration. For example, at a porosity of 0.8, the methane conversion rate of the new configuration is 51.59%, compared to 49.47% for the conventional configuration, a 1.92% improvement. The light-to-fuel efficiency of the new configuration is 32.89%, compared to 31.97% for the conventional configuration, a 0.92% improvement. This further demonstrates that the edge energy recovery configuration significantly improves the overall fluid domain temperature and system efficiency.

[0021] Figure 3 It shows that the implementation of this solution can increase the overall temperature of the fluid in the reactor. Increasing the fluid temperature can enhance the overall reaction efficiency of the reactor. Compared with traditional reactors, the fluid temperature in the edge energy flow recovery configuration reactor is obviously higher, and its temperature uniformity is also better, which shows that improving the utilization efficiency of uneven solar Gaussian heat flow can increase the overall temperature of the fluid. From the comparison of simulation calculation data, the methane conversion rate exceeds 65%, the carbon dioxide conversion rate exceeds 75%, and the energy conversion efficiency of solar energy into chemical energy can reach 43%. In summary, the edge energy flow recovery configuration of the present invention significantly improves the energy utilization efficiency of the solar methane dual reactor.

[0022] There are many specific implementation ways of the present invention. The above is only the preferred implementation method of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be considered as the scope of protection of the present invention.

Claims

1. A solar dual reactor with edge energy flow recovery configuration, characterized in that: It comprises a reactor (1) and a heat-insulating layer (2) wrapped around the outside of the reactor (1), wherein one end of the reactor (1) is a solar radiation energy flow receiving end (6), and the other end is a gas inlet and outlet end; The reactor (1) is further embedded with an annular thin plate (4), the axial length of the annular thin plate (4) being smaller than that of the reactor (1) and extending to the gas inlet and outlet ends, and the gas inlet and outlet ends are divided by the annular thin plate (4) into a reaction gas inlet (3) located outside the annular thin plate (4) and a synthesis gas outlet (5) located inside the annular thin plate (4).

2. The solar dual reactor with edge energy flow recovery configuration according to claim 1, characterized in that: The internal structure of the reactor (1) is a porous medium structure, the porosity of the porous medium structure varies in the range of 0.80 to 0.93, and the average pore diameter is 2 mm.

3. The solar dual reactor with edge energy flow recovery configuration according to claim 2, characterized in that: The porous medium structure is made by 3D printing of copper, nickel and a high-temperature alloy containing these two elements.

4. The solar dual reactor with edge energy flow recovery configuration according to claim 1, characterized in that: The reactor (1) further comprises an inner catalyst coated on the porous medium structure, wherein the catalyst is a catalyst having Ni, Co, Si, Cu, Al, Ag or Rh as a matrix.

5. The solar dual reactor with edge energy flow recovery configuration according to claim 1, characterized in that: The thermal insulation layer (2) is a ceramic fiber product composed of aluminum oxide and silicon dioxide.

6. The solar dual reactor with edge energy flow recovery configuration according to any one of claims 1 to 5, characterized in that: The reactor (1) has a cylindrical shape and a cylindrical diameter. D is 2 cm, the cylinder height H is 2 cm.

7. The solar dual reactor with edge energy flow recovery configuration according to claim 6, characterized in that: The annular thin plate (4) is a cylindrical thin plate with a solid structure. The thickness of the annular thin plate is d c The height of the top of the reactor is 0.25 mm. h is 2 mm, the inner radius of the thin plate R is 13 mm.

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