阅读说明：本技术 一种天然气催化燃烧蓄热型红外加热物体的方法 (Method for heating object by natural gas catalytic combustion heat accumulation type infrared radiation ) 是由 李孔斋 李丹阳 王�华 徐瑞东 杜云鹏 于 2021-08-16 设计创作，主要内容包括：本发明涉及一种天然气催化燃烧蓄热型红外加热物体的方法,属于天然气催化燃烧红外加热技术领域。本发明将核壳结构相变蓄热催化剂置于催化燃烧器中,将天然气混合气通入催化燃烧器中,催化燃烧器升温至天然气混合气在核壳结构相变蓄热催化剂上发生表面催化燃烧反应使核壳结构相变蓄热催化剂相变积热；关闭混合气和热源,核壳结构相变蓄热催化剂相变放热发射红外光,红外光加热吸收该红外光的物体。本发明可有效解决天然气催化燃烧红外加热中存在的反应器温度骤然变化导致的红外辐射波段不稳定且难有效控制的技术问题。(The invention relates to a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion, and belongs to the technical field of natural gas catalytic combustion infrared heating. The method comprises the steps of placing a core-shell structure phase-change heat storage catalyst in a catalytic combustor, introducing natural gas mixed gas into the catalytic combustor, and heating the catalytic combustor until the natural gas mixed gas generates a surface catalytic combustion reaction on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to generate phase-change heat storage; and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to release heat through phase change to emit infrared light, and heating the object absorbing the infrared light by using the infrared light. The invention can effectively solve the technical problems of unstable infrared radiation wave band and difficult effective control caused by the sudden change of the reactor temperature in the catalytic combustion infrared heating of natural gas.)

1. A method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion is characterized by comprising the following specific steps:

(1) placing a core-shell structure phase-change heat storage catalyst in a catalytic combustor;

(2) introducing natural gas mixture into a catalytic combustor, and heating the catalytic combustor until the natural gas mixture generates a surface catalytic combustion reaction on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to generate phase-change heat storage;

(3) and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to release heat through phase change to emit infrared light, and heating the object to be heated absorbing the infrared light by the infrared light.

2. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 1, wherein: the phase change temperature of the core-shell structure phase change heat storage catalyst in the step (1) is 200-700 ℃.

3. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 2, wherein: core-shell structure phase change heat storage catalyst as load activityThe core-shell structure phase-change heat storage material is FeTi @ TiO₂、[email protected]₂O₃、[email protected]₂O₃Or CuZn @ ZnO, and the active component is a noble metal catalyst.

4. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 3, wherein: the noble metal catalyst includes a noble metal and a support.

5. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 3, wherein: the preparation method of the core-shell structure phase-change heat storage material comprises the following specific steps:

1) dispersing the phase change heat storage material precursor into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B;

2) and dropwise adding the mixed solution B and an ammonia water solution into the mixed suspension A at the temperature of 40-80 ℃ under the stirring condition until the pH value of the system is maintained at 8.0-11.0, reacting for 60-180 min, carrying out solid-liquid separation, washing the solid with distilled water and ethanol, carrying out vacuum drying, and roasting at the temperature of 300-700 ℃ for 1-5 h to obtain the core-shell structure phase-change heat storage material.

6. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 5, wherein: the volume of methanol in the methanol/ethylene glycol mixed solution in the step 1) is 5-60%, and the molar ratio of the phase change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 2-10: 0.2-1: 1-3: 0.1-1.

7. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 4, wherein: the preparation method of the core-shell structure phase-change heat storage catalyst comprises the following specific steps:

1) dissolving noble metal salt in an ethanol/distilled water mixed solution to obtain a mixed solution C;

2) adding a carrier into the mixed solution C, stirring for 1-4 h, and adding a core-shell structure phase-change heat storage material to obtain a mixed suspension D;

3) and adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring for 4-6 h, carrying out solid-liquid separation, carrying out vacuum drying, and roasting at the temperature of 200-700 ℃ for 2-4 h to obtain the core-shell structure phase change heat storage catalyst.

8. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 7, wherein: the mass fraction of the noble metal element in the noble metal salt is 0.5-20% by taking the total addition mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total addition mass of the carrier and the core-shell structure phase-change heat storage material is 5-90% by taking the total addition mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%.

9. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 7, wherein: the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 2: 1-10: 1, and the molar ratio of the urea to the noble metal salt is 5: 1-30: 1.

10. A method of heating an object by heat accumulation in the presence of natural gas catalytic combustion as claimed in claim 1, wherein: the natural gas mixture is natural gas/air mixture, the volume concentration ratio of the natural gas to the air is 1: 2-20, and the introduction flow rate of the natural gas mixture is 50-1000 mL/min.

Technical Field

The invention relates to a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion, and belongs to the technical field of natural gas catalytic combustion infrared heating.

Background

Compared with direct flame combustion, the natural gas catalytic combustion is flameless combustion at a lower ignition temperature by means of a catalyst, and has the advantages of high thermal efficiency, high energy utilization rate, low pollutant emission level, safe combustion and the like. Compared with heating modes such as hot air, heat conduction, microwave radiation and the like, the infrared heating can shorten the time for heating the heated body to the required temperature; the natural gas catalytic combustion infrared heating technology coupling the natural gas catalytic combustion technology with the infrared heating mode avoids energy loss caused by visible light emitted by gas phase combustion through flameless combustion carried out on the surface of the catalyst, most of the energy of the natural gas catalytic combustion infrared heating technology is converted into infrared rays to radiate out, and drying and heating of objects can be effectively realized. However, the natural gas catalytic combustion infrared heating technology still has inevitable problems. For example, increased fuel typically causes a sudden increase in reactor temperature, which results in the generation of infrared radiation in a band that is difficult to control.

Disclosure of Invention

The invention provides a method for natural gas catalytic combustion heat storage type infrared heating objects, aiming at the problems that the temperature of a reactor is suddenly increased and the infrared radiation wave band is difficult to control due to the increase of fuel in the natural gas catalytic combustion infrared heating in the prior art, namely, a heat storage type catalyst is selected according to the absorption efficiency of different materials to different infrared wave bands, the surface temperature of the catalyst is accurately and effectively controlled, the heating efficiency of infrared rays is effectively exerted, and higher energy conversion rate and energy utilization rate are obtained.

A method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) placing a core-shell structure phase-change heat storage catalyst in a catalytic combustor;

(2) introducing natural gas mixture into a catalytic combustor, and heating the catalytic combustor until the natural gas mixture generates a surface catalytic combustion reaction on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to generate phase-change heat storage;

(3) the mixed gas and the heat source are closed, the phase change heat storage catalyst with the core-shell structure releases heat to emit infrared light, and the infrared light heats an object to be heated which absorbs the infrared light;

the phase change temperature of the core-shell structure phase change heat storage catalyst in the step (1) is 300-700 ℃;

the core-shell structure phase-change heat storage catalyst is a core-shell structure phase-change heat storage material loaded with active components, and the core-shell structure phase-change heat storage material is FeTi @ TiO₂、[email protected]₂O₃、[email protected]₂O₃Or CuZn @ ZnO, and the active component is a noble metal catalyst;

the noble metal catalyst comprises a noble metal and a carrier;

the preparation method of the core-shell structure phase-change heat storage material comprises the following specific steps:

1) dispersing the phase change heat storage material precursor into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B;

2) dropwise adding the mixed solution B and an ammonia water solution into the mixed suspension A at the temperature of 40-80 ℃ under the stirring condition until the pH value of the system is maintained at 8.0-11.0, continuously reacting for 60-180 min, carrying out solid-liquid separation, washing the solid with distilled water and ethanol, carrying out vacuum drying, and roasting at the temperature of 300-700 ℃ for 1-5 h to obtain the core-shell structure phase-change heat storage material;

further, the volume of the methanol in the methanol/ethylene glycol mixed solution in the step 1) is 5-60%, and the molar ratio of the phase change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 2-10: 0.2-1: 1-3: 0.1-1;

the preparation method of the core-shell structure phase-change heat storage catalyst comprises the following specific steps:

1) dissolving noble metal salt in an ethanol/distilled water mixed solution to obtain a mixed solution C;

2) adding a carrier into the mixed solution C, stirring for 1-4 h, and adding a core-shell structure phase-change heat storage material to obtain a mixed suspension D;

3) adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring and reacting for 4-6 hours, carrying out solid-liquid separation, carrying out vacuum drying, and roasting at the temperature of 300-700 ℃ for 2-4 hours to obtain the core-shell structure phase change heat storage catalyst;

further, the mass fraction of the noble metal element in the noble metal salt is 0.5-20% by taking the total adding mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total adding mass of the carrier and the core-shell structure phase-change heat storage material is 5-90% by taking the total adding mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%;

further, the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 2: 1-10: 1, and the molar ratio of the urea to the noble metal salt is 5: 1-30: 1;

preferably, the natural gas mixture is natural gas/air mixture, the volume concentration ratio of the natural gas to the air is 1: 2-20, and the introduction flow rate of the natural gas mixture is 50-1000 mL/min;

preferably, the infrared absorption wave band of the object to be heated is 2-16 mu m.

The invention has the beneficial effects that:

(1) the invention can effectively solve the technical problems of unstable infrared radiation wave band and difficult effective control caused by the sudden change of the temperature of the reactor in the natural gas catalytic combustion infrared heating technology;

(2) the core-shell structure heat storage type catalyst in the method has high heat storage rate, is suitable for the characteristic of rapid heat release of catalytic methane combustion reaction, can maximally exert infrared heating efficiency, improves the thermal environment of a bed layer, and improves the energy conversion rate and the energy utilization rate;

(3) the invention can select the core-shell structure heat storage type catalyst which is suitable for the phase change temperature according to the infrared wave band absorbed by the object to be heated so as to accurately and effectively control the surface temperature of the core-shell structure heat storage type catalyst in the phase change process, effectively exert the heating efficiency of infrared rays and obtain higher energy conversion rate and energy utilization rate.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the description.

Example 1: the core-shell structure phase change heat storage catalyst Ru/LaNiO of the embodiment₃/[email protected]₂Ru/LaNiO as a catalyst for loading active components₃Core-shell structure phase change heat storage material FeTi @ TiO₂The phase-change temperature is 595 ℃, and the infrared band of phase-change exothermic emission is 3-4 um;

core-shell structure phase change heat storage material FeTi @ TiO₂The preparation method comprises the following specific steps:

1) dispersing a phase change heat storage material precursor Fe-Ti alloy into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B; wherein the volume of the methanol in the methanol/ethylene glycol mixed solution is 5%, and the molar ratio of the phase-change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 10: 1: 3: 1;

2) dropwise adding the mixed solution B and an ammonia water solution into the mixed suspension A at the temperature of 40 ℃ under the stirring condition until the pH value of the system is maintained at 8.0, reacting for 60 min, carrying out solid-liquid separation, washing the solid for 4 times by using distilled water and ethanol, drying in vacuum at the temperature of 20 ℃, and roasting at the temperature of 700 ℃ for 5h to obtain the core-shell structure phase-change heat storage material FeTi @ TiO₂；

Core-shell structure phase change heat storage catalyst Ru/LaNiO₃/[email protected]₂The preparation method comprises the following specific steps:

1) adding a noble metal salt RuCl₃Dissolving the mixture in an ethanol/distilled water mixed solution to obtain a mixed solution C; wherein the volume ratio of ethanol to distilled water in the ethanol/distilled water mixed solution is 0.1: 1;

2) the carrier (LaNiO)₃A carrier) is added into the mixed solution C, and after stirring and loading for 1h, the core-shell structure phase change heat storage material FeTi @ TiO is added₂Obtaining a mixed suspension D;

3) adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring for reaction for 4h, performing solid-liquid separation, vacuum drying at 20 ℃, and roasting at 700 ℃ for 4h to obtain the core-shell structure phase change storageThermal catalyst Ru/LaNiO₃/[email protected]₂(ii) a The mass fraction of the noble metal element in the noble metal salt is 0.5% by taking the total adding mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total adding mass of the carrier and the core-shell structure phase-change heat storage material is 5% by taking the total adding mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%; the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 2:1, and the molar ratio of the urea to the noble metal salt is 5: 1;

a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) 100g of core-shell structure phase change heat storage catalyst Ru/LaNiO₃/[email protected]₂Placing in a catalytic burner;

(2) introducing natural gas mixture into a catalytic combustor, heating the catalytic combustor to 650 ℃, and carrying out surface catalytic combustion reaction on the natural gas mixture on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to carry out phase-change heat storage; the natural gas mixed gas is natural gas/air mixed gas, the volume concentration ratio of the natural gas to the air is 1:10, and the introduction flow rate of the natural gas mixed gas is 200 mL/min;

(3) and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to release heat through phase change to emit infrared light, and heating the object to be heated absorbing the infrared light by the infrared light, namely drying the food absorbing the infrared light with the wave band of 3-4 um.

Example 2: the core-shell structure phase change heat storage catalyst Pd/BaFe of the embodiment₃Al₉O₁₉/[email protected]₂O₃As a loaded active component catalyst Pd/BaFe₃Al₉O₁₉Core-shell structure phase change heat storage material AlSn @ Al₂O₃The phase change temperature is 228 ℃, and the infrared band emitted by phase change heat release is 5-6 um;

core-shell structure phase change heat storage material AlSn @ Al₂O₃The preparation method comprises the following specific steps:

1) dispersing a phase change heat storage material precursor Al-Sn alloy into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B; wherein the volume of the methanol in the methanol/ethylene glycol mixed solution accounts for 60%, and the molar ratio of the phase-change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 2:0.2:1: 0.1;

2) dropwise adding the mixed solution B and an ammonia water solution into the mixed suspension A at the temperature of 80 ℃ under the stirring condition until the pH value of the system is maintained at 11.0, reacting for 180 min, carrying out solid-liquid separation, washing the solid for 3 times by using distilled water and ethanol, carrying out vacuum drying at the temperature of 60 ℃, and roasting at the temperature of 500 ℃ for 5h to obtain the core-shell structure phase-change heat storage material AlSn @ Al₂O₃；

Phase change heat storage catalyst Pd/BaFe with core-shell structure₃Al₉O₁₉/[email protected]₂O₃The preparation method comprises the following specific steps:

1) adding noble metal salt Pd (NO)₃)₂Dissolving the mixture in an ethanol/distilled water mixed solution to obtain a mixed solution C; wherein the volume ratio of ethanol to distilled water in the ethanol/distilled water mixed solution is 1: 1;

2) mixing the carrier (BaFe)₃Al₉O₁₉Carrier) is added into the mixed solution C, and after stirring and loading for 4 hours, the core-shell structure phase change heat storage material AlSn @ Al is added₂O₃Obtaining a mixed suspension D;

3) adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring and reacting for 6h, carrying out solid-liquid separation, carrying out vacuum drying at the temperature of 60 ℃, and roasting at the temperature of 500 ℃ for 3h to obtain the core-shell structure phase change heat storage catalyst Pd/BaFe₃Al₉O₁₉/[email protected]₂O₃(ii) a The mass fraction of the noble metal element in the noble metal salt is 10% by taking the total adding mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total adding mass of the carrier and the core-shell structure phase-change heat storage material is 90% by taking the total adding mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%; the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 10:1, and the molar ratio of the urea to the noble metal salt is 30: 1;

a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) 300g of core-shell structure phase change heat storage catalyst Pd/BaFe₃Al₉O₁₉/[email protected]₂O₃Placing in a catalytic burner;

(2) introducing natural gas mixture into a catalytic combustor, heating the catalytic combustor to 320 ℃, and carrying out surface catalytic combustion reaction on the natural gas mixture on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to carry out phase-change heat storage; the natural gas mixed gas is natural gas/air mixed gas, the volume concentration ratio of the natural gas to the air is 1:15, and the introduction flow rate of the natural gas mixed gas is 500 mL/min;

(3) and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to carry out phase-change heat release to emit infrared light, and heating the object to be heated absorbing the infrared light by the infrared light, namely drying the casting coating absorbing the infrared light with the wave band of 5-6 microns.

Example 3: the core-shell structure phase-change heat storage catalyst Pt/Fe of the embodiment₂O₃/[email protected]₂O₃For loading active component catalyst Pt/Fe₂O₃Core-shell structure phase change heat storage material AlSi @ Al₂O₃The phase change temperature is 577 ℃, and the infrared band emitted by phase change heat release is 3-4 um;

core-shell structure phase change heat storage material AlSi @ Al₂O₃The preparation method comprises the following specific steps:

1) dispersing a phase change heat storage material precursor Al-Si alloy into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B; wherein the volume of the methanol in the methanol/ethylene glycol mixed solution accounts for 20%, and the molar ratio of the phase-change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 5:0.5:2: 1;

2) dropwise adding the mixed solution B and ammonia water solution into the mixed suspension A at 50 deg.C under stirring until the pH value of the system is 10.0, reacting for 120 min, performing solid-liquid separation, and distilling the solidWashing with water and ethanol for 3 times, vacuum drying at 50 deg.C, and calcining at 600 deg.C for 3 hr to obtain core-shell structure phase change heat storage material AlSi @ Al₂O₃；

Core-shell structure phase change heat storage catalyst Pt/Fe₂O₃/[email protected]₂O₃The preparation method comprises the following specific steps:

1) adding noble metal salt Pt (NO)₃)₂Dissolving the mixture in an ethanol/distilled water mixed solution to obtain a mixed solution C; wherein the volume ratio of ethanol to distilled water in the ethanol/distilled water mixed solution is 0.5: 1;

2) a carrier (Fe)₂O₃Carrier) is added into the mixed solution C, and after stirring and loading for 2 hours, the core-shell structure phase change heat storage material AlSi @ Al is added₂O₃Obtaining a mixed suspension D;

3) adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring and reacting for 5h, carrying out solid-liquid separation, carrying out vacuum drying at the temperature of 50 ℃, and roasting at the temperature of 600 ℃ for 3h to obtain the core-shell structure phase change heat storage catalyst Pt/Fe₂O₃/[email protected]₂O₃(ii) a The mass fraction of the noble metal element in the noble metal salt is 5% by taking the total adding mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total adding mass of the carrier and the core-shell structure phase-change heat storage material is 50% by taking the total adding mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%; the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 5:1, and the molar ratio of the urea to the noble metal salt is 10: 1;

a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) 50g of core-shell structure phase-change heat storage catalyst Pt/Fe₂O₃/[email protected]₂O₃Placing in a catalytic burner;

(2) introducing natural gas mixture into a catalytic combustor, heating the catalytic combustor to 630 ℃, and carrying out surface catalytic combustion reaction on the natural gas mixture on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to carry out phase-change heat storage; the natural gas mixed gas is natural gas/air mixed gas, the volume concentration ratio of the natural gas to the air is 1:2, and the introduction flow rate of the natural gas mixed gas is 50 mL/min;

(3) the mixed gas and the heat source are closed, the phase change heat storage catalyst with the core-shell structure releases heat to emit infrared light, and the infrared light heats the object to be heated which absorbs the infrared light, namely, the wood which absorbs the infrared light and has the wave band of 3-4 um is dried;

a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) 50g of core-shell structure phase-change heat storage catalyst Pt/Fe₂O₃/[email protected]₂O₃Placing in a catalytic burner;

(2) introducing natural gas mixture into a catalytic combustor, heating the catalytic combustor to 600 ℃, and carrying out surface catalytic combustion reaction on the natural gas mixture on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to carry out phase-change heat storage; the natural gas mixed gas is natural gas/air mixed gas, the volume concentration ratio of the natural gas to the air is 1:5, and the introduction flow rate of the natural gas mixed gas is 100 mL/min;

(3) and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to change phase and release heat to emit infrared light, and heating the object to be heated absorbing the infrared light by the infrared light, namely drying the grains absorbing the infrared light with the wave band of 3-4 um.

Example 4: the phase change heat storage catalyst Rh/SiO with core-shell structure of the embodiment₂Catalyst Rh/SiO with/CuZn @ ZnO as load active component₂The phase-change heat storage material CuZn @ ZnO with the core-shell structure has the phase-change temperature of 430 ℃ and the infrared band of phase-change heat release emission of 4-5 um;

the preparation method of the core-shell structure phase change heat storage material CuZn @ ZnO comprises the following specific steps:

1) dispersing a phase change heat storage material precursor Cu-Zn alloy into a methanol/ethylene glycol mixed solution to obtain a mixed suspension A; adding gelatin, nickel nitrate and sodium dodecyl sulfate into deionized water to prepare a mixed solution B; wherein the volume of the methanol in the methanol/ethylene glycol mixed solution accounts for 30 percent, and the molar ratio of the phase-change heat storage material precursor to the gelatin to the nickel nitrate to the sodium dodecyl sulfate is 7:0.6:2: 0.5;

2) dropwise adding the mixed solution B and an ammonia water solution into the mixed suspension A at the temperature of 40 ℃ under the stirring condition until the pH value of the system is maintained at 9.0, reacting for 90 min, carrying out solid-liquid separation, washing the solid for 4 times by using distilled water and ethanol, carrying out vacuum drying at the temperature of 40 ℃, and roasting at the temperature of 700 ℃ for 1h to obtain the core-shell structure phase-change heat storage material CuZn @ ZnO;

phase change heat storage catalyst Rh/SiO with core-shell structure₂The preparation method of/CuZn @ ZnO comprises the following specific steps:

1) adding noble metal salt RhCl₃·3H₂Dissolving O in the mixed solution of ethanol and distilled water to obtain a mixed solution C; wherein the volume ratio of ethanol to distilled water in the ethanol/distilled water mixed solution is 0.5: 1;

2) mixing the carrier (SiO)₂A carrier) is added into the mixed solution C, and after stirring and loading for 2 hours, a core-shell structure phase change heat storage material CuZn @ ZnO is added to obtain a mixed suspension D;

3) adding cetyl trimethyl ammonium bromide and urea into the mixed suspension D, stirring and reacting for 5h, carrying out solid-liquid separation, carrying out vacuum drying at the temperature of 50 ℃, and roasting at the temperature of 700 ℃ for 1h to obtain the core-shell structure phase change heat storage catalyst Rh/SiO₂(ii) CuZn @ ZnO; the mass fraction of the noble metal element in the noble metal salt is 1% by taking the total adding mass of the noble metal element in the noble metal salt and the carrier as 100%, and the mass fraction of the noble metal element in the noble metal salt and the total adding mass of the carrier and the core-shell structure phase-change heat storage material is 30% by taking the total adding mass of the noble metal element in the noble metal salt, the carrier and the core-shell structure phase-change heat storage material as 100%; the mass ratio of the hexadecyl trimethyl ammonium bromide to the noble metal salt is 8: 1, and the molar ratio of the urea to the noble metal salt is 20: 1;

a method for heating an object by heat accumulation type infrared rays through natural gas catalytic combustion comprises the following specific steps:

(1) 500g of core-shell structure phase-change heat storage catalyst Rh/SiO₂the/CuZn @ ZnO is placed in a catalytic combustor;

(2) introducing natural gas mixture into a catalytic combustor, heating the catalytic combustor to 480 ℃, and carrying out surface catalytic combustion reaction on the natural gas mixture on the core-shell structure phase-change heat storage catalyst to enable the core-shell structure phase-change heat storage catalyst to carry out phase-change heat storage; the natural gas mixed gas is natural gas/air mixed gas, the volume concentration ratio of the natural gas to the air is 1:20, and the introduction flow rate of the natural gas mixed gas is 1000 mL/min;

(3) and (3) closing the mixed gas and the heat source, enabling the core-shell structure phase-change heat storage catalyst to carry out phase-change heat release to emit infrared light, and heating the object to be heated absorbing the infrared light by the infrared light, namely drying grains and food absorbing the infrared light with the wave band of 4-5 um.

While the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.