A coupled reforming system

Abstract

The application provides a coupled reforming system, which comprises a reformer body, a plurality of combustion channels, the plurality of combustion channels are arranged on the reformer body along the axial direction of the reformer body, a plurality of reforming channels, the plurality of reforming channels are arranged on the reformer body along the axial direction of the reformer body, and the plurality of reforming channels and the plurality of combustion channels are arranged in the radial direction and are spaced apart from each other. The combustion channels are arranged on the reformer body, heat released by combustion of the combustion channels can be used to supply heat for endothermic reforming reactions in the reforming channels, the endothermic reforming reactions can be carried out normally, the heat released by the combustion channels is recycled, the endothermic reforming reactions in the reforming channels do not need to be additionally supplied with heat, energy consumption is effectively reduced, waste gas of the combustion channels can be directly introduced into the reforming channels for reforming, pollutant emission is effectively reduced, and material utilization rate is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical reforming processing, in particular to a coupled reforming system. BACKGROUND

[0002] Reforming is a common technical means in chemical production, which is a technical means for preparing waste materials produced in some sections into other useful materials. The reformer is the most core chemical reaction component in the reforming system, and the waste materials are chemically reacted in the reformer to become other useful materials. When different materials are reformed, the chemical reactions and conditions are different. Some reactions are endothermic reactions, that is, they need to input heat from the outside world. Some reactions are exothermic reactions. For endothermic reactions, a large amount of heat needs to be calculated, resulting in high system energy consumption. At the same time, in the chemical production process, there are a large number of production processes that are exothermic reactions, and basically all the heat is not recycled, resulting in a large amount of heat energy waste.

[0003] In summary, for endothermic reforming reactions, the chemical production system has a large amount of energy waste, resulting in the problem of high system energy consumption.

[0004] Therefore, if the problem of high energy consumption of chemical production involving endothermic reforming reactions is overcome, it becomes a technical problem to be solved. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a coupled reforming system to solve the problem of high energy consumption of chemical production involving endothermic reforming reactions in the prior art.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows: a coupled reforming system, comprising:

[0007] a reformer body;

[0008] a plurality of combustion channels, each of the plurality of combustion channels being provided on the reformer body along an axial direction of the reformer body;

[0009] a plurality of reforming channels, each of the plurality of reforming channels being provided on the reformer body along the axial direction of the reformer body;

[0010] wherein the plurality of reforming channels and the plurality of combustion channels are arranged in a radial direction.

[0011] Optionally, the heat transfer model of the coupled reforming system is:

[0012]

[0013] wherein, Qtotal is the total heat generated in the plurality of combustion channels, is the total amount of heat transfer by conduction in the reformer body, is the total amount of heat transfer by convection in the reformer body, m wall × ΔT × C p is the energy consumed by the temperature rise of the reformer body (where, m wall is the total mass of the reformer body, ΔT is the temperature rise of the reformer body, C p is the specific heat of the reformer body), h out-air (T out -T air ) is the heat exchange amount between the reformer body and the environment (h out-air is the heat exchange coefficient of the reformer body, T out is the temperature at the outer surface of the reformer body, T air is the temperature of the ambient air), is the energy removed when the combustion channel exhausts.

[0014] Optionally, the quantity model between the combustion channel and the reforming channel is set as:

[0015]

[0016] where, i is the number of combustion channels, j is the number of reforming channels, ΔH comb is the heat generated by a single combustion channel, is the total heat generated by i combustion channels, ΔH reform is the heat absorbed by a single reforming channel, is the total heat absorbed by j reforming channels, H exhaust is the heat removed when the combustion channel exhausts.

[0017] Optionally, the number of combustion channels is not less than 1, and the heat absorbed by each reforming channel is between the minimum temperature and the maximum temperature required for the reforming reaction;

[0018] The number of combustion channels and reforming channels is also satisfied that the temperature difference between any two reforming channels is the minimum.

[0019] Optionally, the heat exchange between the combustion channel and the reforming channel includes heat conduction heat exchange, and the heat conduction model between the combustion channel and the reforming channel is:

[0020]

[0021] where, is the total amount of heat conduction between the combustion channel i and the reforming channel j, λ wall is the internal thermal conductivity of the reformer body (W / m 2 .K), T wall-iT is the wall temperature of the combustion channel i wall-i T is the wall temperature of the reforming channel j.

[0022] Optionally, the combustion channel also has convection heat transfer, and the convection heat transfer model of the combustion channel is:

[0023]

[0024] wherein, h is the convection heat exchange amount between the gas and the wall in the combustion channel i, h i is the convection heat transfer coefficient (W / m 2 .K) of the combustion channel i, and T gas-i is the near-wall heat transfer temperature of the combustion channel i.

[0025] Optionally, the reformer body is also coated with a heat insulation layer on the outer circumferential surface.

[0026] Optionally, the reforming channel comprises a reforming feed end, a reforming channel body and a reforming discharge end which are sequentially communicated;

[0027] The combustion channel comprises a combustion feed end, a combustion channel body and a combustion discharge end which are sequentially communicated;

[0028] Wherein, the combustion feed end is arranged at the same end as the reforming feed end or is arranged at different ends.

[0029] Optionally, the reforming channel body is also provided with a catalyst coating layer;

[0030] The combustion feed end is provided with an ignition module;

[0031] The combustion discharge end is communicated with the reforming feed end.

[0032] Optionally, the radial sections of the reforming channel body and the combustion channel body are circular, rectangular, rhombic, regular hexagonal and / or trapezoidal.

[0033] Beneficial effects: the coupling type reforming system provided by the application can utilize the heat released by the combustion channel to heat the endothermic reforming reaction in the reforming channel, so as to ensure the normal progress of the endothermic reforming reaction, recycle the heat released by the combustion channel, and effectively reduce energy consumption without the need for additional heating of the endothermic reforming reaction in the reforming channel; at the same time, the exhaust gas of the combustion channel can be directly guided into the reforming channel for reforming, thereby effectively reducing pollutant emissions and providing material utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1is a functional schematic diagram of a coupled reforming system provided in the present application;

[0035] Figure 2 is a radial sectional view of a coupled reforming system provided in the present application;

[0036] Figure 3 is a schematic diagram of a heat transfer model of a coupled reforming system provided in the present application;

[0037] Figure 4 is a schematic diagram of a heat conduction model of a reforming channel and a combustion channel in a coupled reforming system provided in the present application (b part), and a schematic diagram of a convection heat transfer model (a part);

[0038] Figure 5 is an axial sectional view of a reforming channel in a reformer body in a coupled reforming system provided in the present application;

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 10, coupled reforming system; 11, reformer body; 12, combustion channel; 13, reforming channel; 14, heat insulation layer; 131, reforming feed end; 132, reforming channel body; 133, reforming discharge end; 134, catalyst coating; 121, combustion feed end; 122, combustion channel body; 123, combustion discharge end; 124, ignition module. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer and more explicit, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0042] Please refer to Figure 1 and Figure 2 In the first embodiment of the present application, a coupled reforming system 10 is provided, which comprises a reformer body 11, a plurality of combustion channels 12 and a plurality of reforming channels 13; the plurality of combustion channels 12 are each formed on the reformer body 11 along an axial direction of the reformer body 11; the plurality of reforming channels 13 are each formed on the reformer body 11 along the axial direction of the reformer body 11; and the plurality of reforming channels 13 and the plurality of combustion channels 12 are each arranged in a radial direction.

[0043] It can be understood that the reformer body 11 is provided with a plurality of combustion channels 12 and reforming channels 13 arranged at intervals in the radial section; in operation, the combustion exothermic reaction is carried out in the combustion channels 12, and then the heat released in the combustion channels 12 is conducted to the reforming channels 13 through the reformer body 11 to supply heat for the endothermic reforming reaction in the reforming channels 13; in particular, by arranging the combustion channels 12 on the reformer body 11, the heat released by the combustion channels 12 can be used to supply heat for the endothermic reforming reaction in the reforming channels 13, so that the endothermic reforming reaction can be carried out normally, the heat released in the combustion channels 12 is recycled, and the endothermic reforming reaction in the reforming channels 13 does not need to be additionally heated, thereby effectively reducing energy consumption; at the same time, the exhaust gas of the combustion channels 12 can be directly guided to the reforming channels 13 for reforming, thereby effectively reducing pollutant emissions and improving material utilization.

[0044] Please refer to Figure 3 , Figure 3 For the heat transfer model of the coupled reforming system 10, in some embodiments, the heat transfer model of the coupled reforming system 10 is: wherein, Qtotal is the total heat generated in the combustion channels 12, Qconduction is the total heat transfer amount of heat conduction in the reformer body 11, Qconvection is the total heat transfer amount of convective heat transfer in the reformer body 11, m wall ×ΔT×C p Qreformer is the energy consumed by the temperature rise of the reformer body 11 (wherein, m wall is the total mass of the reformer body 11, ΔT is the temperature rise of the reformer body 11, C p is the specific heat of the reformer body 11), h out-air (T out -T air ) is the heat exchange amount between the reformer body 11 and the environment (h out-air is the heat exchange coefficient of the reformer body 11, T out is the temperature at the outer surface of the reformer body 11, T air is the temperature of the ambient air), Qexhaust is the energy removed when the exhaust gas of the combustion channels 12 is removed. In particular, please refer to Figure 3 , Figure 3 The combustion channels and the reforming channels are fed in the same direction and discharged in the same direction; wherein λ is the thermal conductivity of the wall thickness (W / m.K), h is the convective heat transfer coefficient (W / m 2 .K), Q is the heat transfer amount (thermal conduction and convective heat transfer). When a channel is a reforming channel, heat is needed, i.e. When a channel is a combustion channel, it releases heat to the surroundings, i.e.

[0045] It can be understood that in the coupling reforming system 10 provided in the present application, the total heat generated by the combustion channels 12, minus the heat lost by the exhaust and the heat absorbed by the reformer body 11 when heated, is not less than the sum of the heat required by each reforming channel 13; that is, the coupling reforming system 10 provided in the present application does not need to supply heat from the outside when carrying out the endothermic integration reaction, thereby effectively reducing the energy consumption during reforming.

[0046] In some embodiments, the number model between the combustion channels 12 and the reforming channels 13 is set as: wherein i is the number of combustion channels 12, j is the number of reforming channels 13, ΔH comb is the heat generated by a single combustion channel 12, is the total heat generated by i combustion channels 12, ΔH reform is the heat absorbed by a single reforming channel 13, is the total heat absorbed by j reforming channels 13, H exhaust is the heat removed by the exhaust of the combustion channels 12.

[0047] It can be understood that the number of the combustion channels 12 is not less than 1, and the heat absorbed by each reforming channel 13 is between the minimum temperature and the maximum temperature required for the reforming reaction; the number of the combustion channels 12 and the reforming channels 13 also satisfies that the temperature difference between any two reforming channels 13 is the smallest, thereby ensuring that the endothermic reforming in the reforming channels 13 in the coupling reforming system 10 can run normally; it should be noted that the combustion channels 12 and the reforming channels 13 can be provided with multiple at the same time, and in specific operation, the number of combustion channels 12 and reforming channels 13 used at the same time can be determined according to the heat absorption of the reaction and reforming reaction of different materials and the heat release of the combustion reaction of different materials, thereby meeting the self-sufficiency of the heat of the coupling reforming system 10, and effectively reducing the energy consumption of the coupling reforming system 10.

[0048] Please further refer to Figure 4 In some embodiments, the heat exchange between the combustion channels 12 and the reforming channels 13 includes heat conduction heat exchange, and the heat conduction model (as shown in part b of FIG. 1) between the combustion channels 12 and the reforming channels 13 is: Figure 4 wherein, wherein, is the total heat conduction between the combustion channel i and the reforming channel j, λ wall is the internal thermal conductivity of the reformer body 11 (W / m 2 .K), T wall-iT is the wall temperature of combustion channel i. wall-j This refers to the wall temperature of the reforming channel j. Specifically, for example... Figure 4 As shown in part b (i.e., the heat conduction model in the coupled reforming system), where, cond in Figure 4 middle It is an abbreviation for heat conduction.

[0049] It is understood that there are two conduction methods between the combustion channel 12 and the reformer body 11: thermal conduction and convection conduction. During the thermal conduction process, the heat released in the combustion channel 12 is transferred only to the reformer body 11 to heat the reforming channel 13. Therefore, considering the total heat conduction between a single set of combustion channel 12 and reforming channel 13, the wall temperatures of combustion channel 12 and reforming channel 13 are used as the characterization. Through the temperature difference between the two and the internal thermal conductivity of the reformer body 11, the heat transfer model can be reflected. By knowing the heat conduction model between the combustion channel 12 and reforming channel 13, a theoretical basis is provided for optimizing the number, inner diameter, and spacing of the reforming channel 13 and combustion channel 12. This ensures the reforming reaction for different materials and provides a targeted coupled reforming system 10, ensuring that the heat of the endothermic reforming reaction in the coupled reforming system 10 is self-sufficient, effectively reducing energy consumption while further protecting the environment.

[0050] In some embodiments, convective heat transfer also exists in the combustion channel 12, and the convective heat transfer model of the combustion channel 12 (e.g.) Figure 4 (as shown in part a) is: in, h represents the convective heat exchange between the gas and the wall in combustion channel i. i The convective heat transfer coefficient of combustion channel i (W / m) 2 .K), and T gas-i This refers to the near-wall heat transfer temperature of combustion channel i. Specifically, for example... Figure 4 As shown in part b (i.e., the heat conduction model in the coupled reforming system), where, conv in Figure 4 middle It is an abbreviation for convection.

[0051] It is understood that there is convective heat transfer between the combustion reaction in the combustion channel 12 and the reformer body 11. For the coupled reforming system 10, the most important thing is to maintain heat balance. By providing a convective heat transfer model of the combustion channel 12, the heat exchange state and situation between the combustion channel 12 and the reformer body 11 can be effectively grasped, thus ensuring the heat absorption requirements of the reforming reaction.

[0052] Please refer to Figure 5 In some embodiments, the reformer body 11 is further coated with a heat insulation layer 14 on the outer circumferential surface. It can be understood that by coating the reformer body 11 with a heat insulation layer 14 on the outer circumferential surface, the heat exchange between the reformer body 11 and the external environment can be effectively reduced, thereby avoiding the heat loss of the coupled reforming system 10.

[0053] Please further refer to Figures 1 to 3 In some embodiments, the reforming channel 13 comprises a reforming feed end 131, a reforming channel body 132 and a reforming discharge end 133 connected in sequence; the combustion channel 12 comprises a combustion feed end 121, a combustion channel body 122 and a combustion discharge end 123 connected in sequence; wherein the combustion feed end 121 is arranged at the same end as the reforming feed end 131; or the combustion feed end 121 is arranged opposite to the reforming feed end 131.

[0054] It can be known that the reforming feed end 131 of the reforming channel 13 and the combustion feed end 121 of the combustion channel 12 are arranged on the same side, and the reforming feed end 131 of the reforming channel 13 and the combustion feed end 131 of the combustion channel 12 are arranged on the opposite side; thereby facilitating the application of the coupled reforming system 10 in different scenarios and improving the use range of the coupled reforming system 10.

[0055] In some embodiments, the reforming channel body 132 is further provided with a catalyst coating layer 134. It can be understood that by providing the catalyst coating layer 134 on the reforming channel body 132, the efficiency of the reforming reaction can be effectively improved, and the product conversion rate of the reforming reaction can be improved. Specifically, the catalyst coating layer 134 can be a Pt, Pd or Rh coating, and the catalyst coating layer 134 takes alumina as the carrier.

[0056] Preferably, the reforming channel body 132 is not provided with a catalyst coating layer 134; thereby the number of the combustion channel 12 and the reforming channel 13 can be adjusted at any time according to the conditions of the reforming and combustion reactions of different materials, i.e. the combustion channel 12 and the reforming channel 13 can be adjusted at any time, for example, the combustion channel 12 can be temporarily used as the reforming channel 13, and the reforming channel 13 can be used as the combustion channel 12, thereby optimizing the channel setting of the coupled reforming system 10 for different material reforming reactions at any time, and ensuring the system efficiency of the coupled reforming system 10.

[0057] Please further refer to Figure 1In some embodiments, the combustion feed end 121 is provided with an ignition module 124. It can be understood that by providing the combustion feed end 121 with the ignition module 124, the start of the combustion reaction in the combustion passage 12 can be controlled, thereby improving the automation level of the coupled reforming system 10.

[0058] In some other embodiments, the combustion discharge end 123 is in communication with the reforming feed end 131. By communicating the combustion discharge end 123 with the reforming feed end 131, the combustion heat of the material can be used to directly guide the combustion exhaust into the reforming passage for reforming, thereby protecting the environment and providing the energy utilization rate of the coupled reforming system 10. Specifically, the reforming feed end 131 and the combustion feed end 121 are provided on the same side, and the combustion and reforming feed (gas source) can be the same (such as methane, methanol, etc.), which makes the upstream feed more convenient and stable (sharing most of the gas supply system). At the same time, the combustion and reforming feed (gas) is not completely consistent. For the combustion passage 12, the required gas is fuel and air; and for the reforming passage 13, the required gas is determined according to the reforming type, for example, the required gas for steam reforming is raw material and water vapor, etc.

[0059] In some embodiments, the radial cross sections of the reforming passage body 132 and the combustion passage body 122 are provided in a circular, rectangular, rhombic, regular hexagonal, and / or trapezoidal shape.

[0060] It can be understood that by controlling the shape of the radial cross section of the reforming passage body 132 and the combustion passage body 122, the adaptability of the combustion passage 12 and the reforming passage 13 to different materials can be ensured; at the same time, the reaction demand of different reaction flow rates can be met. Further, the area and shape of the radial cross section of the combustion passage 12 and the reforming passage 13 can be the same; or different, which can further adapt to the flow demand of different materials with different characteristics in each group; during operation, the flow rate and flow of the material in the combustion passage 12 and the reforming passage 13 are preferably the same, thereby facilitating the control of the reaction process; of course, they can also be different, which can further meet the reaction time and suction amount demand of different materials.

[0061] In summary, the coupling type reforming system 10 provided by the present application comprises a reformer body 11, a plurality of combustion channels 12, the plurality of combustion channels 12 are arranged on the reformer body 11 along the axial direction of the reformer body 11, a plurality of reforming channels 13, the plurality of reforming channels 13 are arranged on the reformer body 11 along the axial direction of the reformer body 11, and the plurality of reforming channels 13 and the plurality of combustion channels 12 are arranged in a radial direction. By arranging the combustion channels 12 on the reformer body 11, the heat released by the combustion channels 12 can be used to heat the endothermic reforming reaction in the reforming channels 13, ensuring the normal progress of the endothermic reforming reaction, recycling the heat released by the combustion channels 12, and not needing to additionally heat the endothermic reforming reaction in the reforming channels 13, effectively reducing energy consumption. At the same time, the exhaust gas of the combustion channels 12 can be directly introduced into the reforming channels 13 for reforming, effectively reducing pollutant emissions, and providing material utilization.

[0062] It should be understood that the application of the present application is not limited to the above examples, and those of ordinary skill in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. A method of constructing a coupled reforming system, characterized by, The coupling type reforming system comprises: a reformer body; a plurality of combustion channels, each of which is formed on the reformer body along the axial direction of the reformer body; a plurality of reforming channels, each of which is formed on the reformer body along the axial direction of the reformer body; wherein the plurality of reforming channels and the plurality of combustion channels are arranged in a radial direction; the number of the combustion channels and the number of the reforming channels are arranged according to the following model: where i is the number of combustion channels, j is the number of reforming channels, ΔH comb heat generated by a single combustion channel, total heat generated by i combustion channels, ΔH reform heat absorbed by a single reforming channel, total heat absorbed by j reforming channels, H exhaust heat removed by exhaust of the combustion channel; the reforming channel comprises a reforming feed end, a reforming channel body and a reforming discharge end which are sequentially connected; the combustion channel comprises a combustion feed end, a combustion channel body and a combustion discharge end which are sequentially connected; wherein the reforming feed end of the reforming channel and the combustion feed end of the combustion channel are arranged on the same side, or the reforming feed end of the reforming channel and the combustion feed end of the combustion channel are arranged on different sides; the combustion discharge end is in communication with the reforming feed end; the reforming channel body is not provided with a catalyst coating layer, and the number of the combustion channels and the number of the reforming channels are adjusted according to the conditions of the reforming and combustion reactions of different materials; the heat transfer model of the coupling type reforming system is: wherein, is the total heat generated in the combustion channels, is the total heat transfer by conduction in the reformer body, is the total heat transfer by convection in the reformer body, m wall x ΔT x C p is the energy consumed by the temperature rise of the reformer body (wherein, m wall is the total mass of the reformer body, ΔT is the temperature rise of the reformer body, C p is the specific heat of the reformer body), h out-air (T out -T air ) is the heat exchange of the reformer body with the environment (h out-air is the heat exchange coefficient of the reformer body, T out is the temperature at the outer surface of the reformer body, T air is the temperature of the ambient air), is the energy removed when the exhaust gases of the combustion channels are removed; the number of the combustion channels is not less than 1, and the heat absorbed by each reforming channel is between the minimum temperature and the maximum temperature required for the reforming reaction; the number of the combustion channels and the number of the reforming channels also satisfy that the temperature difference between any two reforming channels is the minimum; the heat exchange between the combustion channels and the reforming channels comprises heat conduction, and the heat conduction model between the combustion channels and the reforming channels is: wherein, λ is the total amount of heat conduction between the combustion channel i and the reforming channel j, wall λ is the internal heat conductivity of the reformer body (W / m 2 .K), T wall-i is the wall surface temperature of the combustion channel i, T wall-j is the wall surface temperature of the reforming channel j; there is also convection heat transfer in the combustion channel, and the convection heat transfer model of the combustion channel is: wherein, is the convective heat exchange between the gas and the wall in the combustion channel i, h i is the convective heat exchange coefficient (W / m 2 .K) for the combustion channel i, and T gas-i is the near-wall heat exchange temperature for the combustion channel i.

2. The method of claim 1, wherein the coupling reformulating system is constructed and arranged such that, the reformer body is further coated with a heat insulation layer on the outer circumferential surface.

3. The construction method of the coupling type reforming system according to claim 1, wherein: the radial cross sections of the reforming channel body and the combustion channel body are circular, rectangular, rhombic, regular hexagonal or trapezoidal.

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