Device for measuring partial oxidation reforming catalyst of ammonia gas

Abstract

The utility model relates to a device for measuring a reforming catalyst for partial oxidation of ammonia gas. The device comprises a porous main body with a catalyst, a sealing cover, a tail gas outlet, a gas cavity, an ammonia gas and air mixed gas inlet and a heating device, the porous main body is mounted in the reaction cavity; the tail gas outlet is detachably mounted at the lower part of the reaction cavity and is communicated with the reaction cavity; the sealing cover detachably covers the upper part of the reaction cavity; the ammonia and air mixed gas inlet is communicated with the gas cavity, the reaction cavity is mounted in the gas cavity, and the gas inlet hole group is communicated with the gas cavity; a heating device is located in the porous body. The device has the advantages of being simple in structure and easy to disassemble and clean; the device can be repeatedly used, and different catalysts can be conveniently tested.

Description

Technical Field

[0001] The utility model relates to a device for measuring ammonia partial oxidation reforming catalyst. Background Art

[0002] At present, partial oxidation reforming of ammonia to produce hydrogen refers to passing a mixture of ammonia and air into a catalyst. When the temperature reaches above 200°C, the oxidation combustion of ammonia is triggered (the following formula (I)) to generate heat. The heat generated causes the temperature to rise. When the temperature reaches 350°C, the decomposition of ammonia is triggered (the following formula (II)). The decomposition effect is better when it reaches above 600°C. The decomposition of ammonia absorbs heat, and part of the ammonia needs to be continuously oxidized and burned to provide heat for it, thereby achieving self-sustaining heat generation for hydrogen production.

[0003] NH3(g)+0.75O2(g)→0.5N2(g)+1.5H2O(g) △H= -317 kJ mol-1···(Ⅰ)

[0004] NH3(g)→0.5N2(g)+1.5H2(g) △H= +46 kJ mol-1···(Ⅱ)

[0005] Under adiabatic conditions, the heat generated by the combustion of 1 mol of ammonia can thermally decompose about 6 mol of ammonia.

[0006] When ammonia oxidation is dominant, a large amount of heat will be generated, thereby increasing the reaction temperature and the rate of catalytic decomposition of ammonia. When the ammonia decomposition reaction is dominant, it will absorb heat, causing the reaction temperature to drop. Therefore, the ratio of ammonia to air in the mixed gas needs to be controlled so that the ammonia decomposition reaction can be stably maintained above 600°C, and it is necessary to test and compare different catalysts to find a catalyst with higher catalytic activity.

[0007] At present, there is no simple mold that can be used for such tests in the domestic market, so a simple quartz mold needs to be built for testing. Specifically, the catalyst powder is filled in the center of the quartz tube, and the two ends of the quartz tube are sealed with rubber plugs with gas ports. A mixed gas of ammonia and air is introduced from one end, and the tail gas is discharged from the other end. This simple device is prone to problems such as air leakage and poor insulation effect. In addition, in order to avoid a large pressure drop in the quartz tube caused by the filling of finer catalyst powder, catalyst particles with a particle size of more than 1 mm need to be selected, which will reduce the activity and stability of the catalyst and reduce the reaction rate. Utility Model Content

[0008] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a device for measuring ammonia partial oxidation reforming catalyst, the device has a simple structure and is easy to disassemble and clean; it can be reused to test different catalysts; the air cavity can play a role in stabilizing the airflow, so that the mixed gas can stably enter the porous body through the air inlet hole group, and the waste heat generated by the catalytic reaction on the porous body can preheat the gas in the air cavity, thereby reducing the loss of heat energy and improving the reaction efficiency; the air inlet hole group can make the mixed gas uniformly contact with the catalyst on the porous body, so that the catalyst can be fully utilized, and it also helps to evenly distribute the temperature; the pore size of the porous body is 1mm, which can effectively adhere to the catalyst powder while ensuring a small pressure drop.

[0009] In order to achieve the above object, the first technical solution of the utility model is implemented as follows: it is a device for measuring ammonia partial oxidation reforming catalyst, characterized in that it includes:

[0010] A reaction chamber; an air inlet group is provided on the reaction chamber;

[0011] A porous body with a catalyst; the porous body is installed in a reaction chamber;

[0012] A sealing cover and an exhaust gas outlet; the exhaust gas outlet is detachably mounted at the lower part of the reaction chamber and is in communication with the reaction chamber, and the sealing cover is detachably mounted at the upper part of the reaction chamber;

[0013] An air cavity and an air inlet for a mixed gas of ammonia and air; the air inlet for a mixed gas of ammonia and air is connected to the air cavity, the reaction chamber is installed in the air cavity, and the air inlet group is connected to the air cavity so that the mixed gas in the air cavity is discharged after passing through the air inlet group, the porous body, the lower quartz wool filling area and the tail gas outlet in sequence; and

[0014] Heating device; the heating device is located in the porous body

[0015] In the technical solution, it also includes a heat-insulating layer, which is located on the outer wall of the air cavity.

[0016] In the technical solution, there is a gap between the upper part of the porous body and the upper part of the reaction chamber to form an upper quartz wool filling area, and there is a gap between the lower part of the porous body and the lower part of the reaction chamber to form a lower quartz wool filling area.

[0017] In the present technical solution, the catalyst is composed of catalytically active metals loaded on a carrier.

[0018] In the present technical solution, the pore size of the porous body is 1-2 mm.

[0019] Compared with the prior art, the utility model has the following advantages: the utility model has a simple structure and is easy to disassemble and clean; it can be reused, which is convenient for testing different catalysts; the waste heat generated by the catalytic reaction on the porous body can preheat the gas in the air cavity, thereby reducing the loss of heat energy and improving the reaction efficiency; the air inlet hole group can make the mixed gas contact with the catalyst on the porous body evenly, so that the catalyst can be fully utilized and it also helps to evenly distribute the temperature; the pore size of the porous body is 1 mm, which can effectively adhere to the catalyst powder while ensuring a small pressure drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a top view of the utility model;

[0022] Figure 3 yes Figure 2 AA section view;

[0023] Figure 4 It is an exploded view of the utility model. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figures 1 to 4 As shown, it is a device for measuring ammonia partial oxidation reforming catalyst, comprising:

[0026] A reaction chamber 8; an air inlet group 81 is provided on the reaction chamber 8;

[0027] A porous body 9 with a catalyst; the porous body 9 is installed in the reaction chamber 8, the porous body is made of 3D printing technology, the material is 316 stainless steel, can withstand high temperature and corrosion, and its structure is a regularly arranged geometric shape, which can be a circle, a regular hexagon and a square, wherein the circular structure has a smaller fluid dynamics resistance and can better adhere to the catalyst powder;

[0028] A sealing cover 1 and an exhaust gas outlet 5; the exhaust gas outlet 5 is detachably mounted on the lower part of the reaction chamber 8 and is connected thereto, and the sealing cover 1 is detachably mounted on the upper part of the reaction chamber 8;

[0029] The air cavity 7 and the mixed gas inlet 2 of ammonia and air; the mixed gas inlet 2 of ammonia and air are connected with the air cavity 7, the reaction cavity 8 is installed in the air cavity 7, and the air inlet group 81 is connected with the air cavity 7 so that the mixed gas in the air cavity 7 is discharged after passing through the air inlet group 81, the porous body 9, the lower quartz wool filling area 11 and the tail gas outlet 5 in sequence; and

[0030] Heating device 10 ; the heating device 10 is located in the porous body 9 .

[0031] When in use, step 1, remove the sealing cover 1, install the porous body 9 into the reaction chamber 8, fill the porous body 9 with the catalyst powder to be tested from the top, and install the heating device 10;

[0032] Step 2: Ammonia and air are introduced into the air chamber 5 from the mixed gas inlet 2 of ammonia and air to mix the two gases in the air chamber. Then, the heating device is turned on to heat the reaction chamber 8 to 200-300 degrees Celsius. The mixed gas is introduced into the reaction chamber 8 from all directions through the inlet hole group 81, and contacts the catalyst attached to the porous body 9, triggering the oxidation combustion and heat release of ammonia. The catalyst is composed of a catalytically active metal supported on a carrier, preferably at least one metal such as ruthenium, platinum, rhodium, iron, cobalt, nickel, etc. as the catalytically active metal; preferably cerium oxide, aluminum oxide, lanthanum oxide, zirconium oxide, yttrium oxide, yttrium oxide stabilized zirconium oxide or BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ Oxidizable and reducible metal oxides or composite metal oxides as carriers;

[0033] Step three, turn off the heating device to make the temperature reach and maintain above 350°C, then test the maximum temperature and ammonia decomposition rate that the catalyst surface can reach under different ammonia to oxygen ratios and different mixed gas flow rates, and the generated nitrogen, hydrogen, water vapor and other gases are discharged from the exhaust outlet 10.

[0034] In this embodiment, a heat-insulating layer 4 is further included, and the heat-insulating layer 4 is located on the outer wall of the air cavity 7 .

[0035] In the technical scheme, the catalyst is composed of a catalytically active metal supported on a carrier, preferably at least one metal such as ruthenium, platinum, rhodium, iron, cobalt, nickel, etc. as the catalytically active metal; preferably cerium oxide, aluminum oxide, lanthanum oxide, zirconium oxide, yttrium oxide, yttrium oxide stabilized zirconium oxide or BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ Oxidizable and reducible metal oxides or composite metal oxides are used as carriers.

[0036] In the present technical solution, there is a gap between the upper part of the porous body 9 and the upper part of the reaction chamber 8 to form an upper quartz wool filling area 6, and there is a gap between the lower part of the porous body 9 and the lower part of the reaction chamber 8 to form a lower quartz wool filling area 11.

[0037] In the present technical solution, the pore size of the porous body is 1-2 mm.

[0038] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For ordinary technicians in this field, various changes, modifications, substitutions and deformations of these embodiments without departing from the principle and purpose of the present invention still fall within the scope of protection of the present invention.

Claims

1. A device for measuring ammonia partial oxidation reforming catalyst, characterized in that include: A reaction chamber (8); an air inlet hole group (81) is provided on the reaction chamber (8); A porous body (9) with a catalyst; the porous body (9) is installed in a reaction chamber (8); A sealing cover (1) and an exhaust gas outlet (5); the exhaust gas outlet (5) is detachably mounted on the lower part of the reaction chamber (8) and is in communication with the reaction chamber (8); and the sealing cover (1) is detachably mounted on the upper part of the reaction chamber (8); An air cavity (7) and an air inlet (2) for a mixed gas of ammonia and air; the air inlet (2) for a mixed gas of ammonia and air is connected to the air cavity (7), the reaction cavity (8) is installed in the air cavity (7), and the air inlet hole group (81) is connected to the air cavity (7) so that the mixed gas in the air cavity (7) is discharged after passing through the air inlet hole group (81), the porous body (9), the lower quartz wool filling area (11) and the tail gas outlet (5) in sequence; and A heating device (10); the heating device (10) is located in the porous body (9).

2. The device for measuring ammonia partial oxidation reforming catalyst according to claim 1, characterized in that It also includes a heat-insulating layer (4), wherein the heat-insulating layer (4) is located on the outer wall of the air cavity (7).

3. The device for measuring ammonia partial oxidation reforming catalyst according to claim 1, characterized in that There is a gap between the upper part of the porous body (9) and the upper part of the reaction chamber (8) to form an upper quartz wool filling area (6), and there is a gap between the lower part of the porous body (9) and the lower part of the reaction chamber (8) to form a lower quartz wool filling area (11).

4. The device for measuring ammonia partial oxidation reforming catalyst according to claim 1, characterized in that The catalyst is composed of catalytically active metals supported on a carrier.

5. The device for measuring ammonia partial oxidation reforming catalyst according to claim 1, characterized in that The pore size of the porous body is 1-2 mm.

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