Two-way door-shaped furnace tube

Abstract

The utility model relates to a two-way door-shaped furnace tube, which solves the problems that the conversion reaction length is not enough after a normal hydrogen conversion furnace device is miniaturized, or a conversion tube structure is difficult to overhaul, and a catalyst is inconvenient to load and unload. Comprising a horizontal hydrogen production reforming furnace, a reforming pipe, a gas collecting pipe, a combustor and a pigtail pipe, the gas collecting pipe is divided into two strokes along the flow direction of raw material gas, namely a first-stroke gas collecting pipe and a second-stroke gas collecting pipe, the conversion pipes are a plurality of door-shaped conversion pipes which are uniformly distributed inside the hydrogen production conversion furnace, the plurality of conversion pipes are divided into two parts, namely a first stroke and a second stroke, two ends of the first-stroke conversion pipe are respectively connected with the first-stroke upper gas collecting pipe and the first-stroke lower gas collecting pipe through pigtail pipes, and the second-stroke conversion pipe is connected with the second-stroke upper gas collecting pipe through pigtail pipes. The two ends of the second-pass conversion pipe are connected with a second-pass upper gas collecting pipe and a second-pass lower gas collecting pipe through pigtail pipes respectively, and the first-pass lower gas collecting pipe is connected with the second-pass upper gas collecting pipe through a pigtail pipe. According to the utility model, the on-site construction and installation workload is greatly reduced; the conversion rate of a small device is improved; operation and maintenance, overhaul and loading and unloading of the catalyst are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of small hydrogen production reforming furnace devices, and particularly relates to a double-pass portal furnace tube. Background Art

[0002] A hydrogen production reforming furnace is a device that uses hydrocarbon substances as raw materials and adopts steam reforming method to produce hydrogen. In industry, most of them are large vertical devices with a diameter generally above 3 meters, and the reforming furnace tubes are generally straight tubes with a length of 8 - 12 meters. In recent years, small-scale skid-mounted natural gas hydrogen production has become a new trend in the development of small-scale hydrogen production globally, which can meet the small gas volume demand in the station, facilitate modular production and skid-mounted transportation, occupy a small area, and is convenient for flexible and rapid construction, installation and operation. For the miniaturization of the hydrogen production reforming furnace, in order to ensure the full progress of the reforming reaction, the reforming tubes have also been correspondingly changed.

[0003] CN201198449Y discloses a small natural gas hydrogen production reforming furnace with 3 independent furnace tubes of 2 - 3m, distributed in a triangular shape in an upright form and connected by pigtail tubes, so that the raw material gas flows through these 3 furnace tubes in sequence. This method enables the raw material gas to have sufficient reforming reaction length.

[0004] CN116265381A discloses a coil assembly, a mixed gas preheating device and a steam reforming hydrogen production reforming furnace. The coil is tightly coiled to form a structure with lower inlet and lower outlet. This method reduces the floor area of the device and reduces heat loss, but the structure is not conducive to adapting to thermal stress changes and is not conducive to maintenance.

[0005] CN113398864A discloses an industrial hydrogen production reforming furnace device, and the furnace tubes adopt a quasi-S shape structure, which increases the flow path length of the raw material gas. This method enables the raw material gas to have more sufficient contact and reaction with the catalyst, but the height of the equipment cannot be significantly reduced.

[0006] CN219156511U discloses a horizontal natural gas hydrogen production reforming furnace, and the reforming tubes are in a ring shape. This method can greatly reduce the height of the equipment and can effectively adapt to thermal stress changes, but the shape of the reforming tubes is not conducive to the loading and unloading of the catalyst.

[0007] In 2021, China broke the foreign technology monopoly with a set of 250m 3 / h skid-mounted natural gas hydrogen production device. In order to adopt small-scale skid-mounted natural gas hydrogen production equipment with high economic benefits in foreign projects, the main difficulties are: first, to increase the flow length of the raw material gas in the limited furnace body space; second, the structure is simple and stable, which is convenient for the operation, maintenance and repair of the equipment. Content of the Utility Model

[0008] The object of the present utility model is to provide a double-pass portal furnace tube, which solves the problems of insufficient conversion reaction length after the miniaturization of the normal hydrogen reforming furnace device, or high difficulty in overhauling the structure of the reforming tube and inconvenient loading and unloading of catalysts.

[0009] The present utility model is realized by the following technical solutions:

[0010] A double-pass portal furnace tube includes a horizontal hydrogen production reforming furnace, reforming tubes, a collector pipe, burners and pigtail pipes;

[0011] The hydrogen production reforming furnace 1 is provided with a plurality of burners 3, which are evenly arranged at the bottom to form a bottom-firing structure.

[0012] The collector pipe is divided into two passes along the flow direction of the raw material gas, namely a first-pass collector pipe 4 and a second-pass collector pipe 5. The first-pass collector pipe 4 includes a first-pass upper collector pipe 41 and a first-pass lower collector pipe 42. The first-pass upper collector pipe 41 and the first-pass lower collector pipe 42 are respectively distributed on the left and right sides below the hydrogen production reforming furnace 1. The second-pass collector pipe 5 includes a second-pass upper collector pipe 51 and a second-pass lower collector pipe 52. The second-pass upper collector pipe 51 and the second-pass lower collector pipe 52 are respectively distributed on the right and left sides below the hydrogen production reforming furnace 1.

[0013] The reforming tubes 2 are a plurality of portal reforming tubes, with flange covers provided at both ends, filled with catalysts inside, and evenly arranged inside the hydrogen production reforming furnace 1. The plurality of reforming tubes 2 are divided into two parts: the first pass and the second pass. The two ends of the reforming tubes in the first pass are respectively connected to the first-pass upper collector pipe 41 and the first-pass lower collector pipe 42 by pigtail pipes 7. The two ends of the reforming tubes in the second pass are respectively connected to the second-pass upper collector pipe 51 and the second-pass lower collector pipe 52 by pigtail pipes 7.

[0014] The first-pass lower collector pipe 42 and the second-pass upper collector pipe 51 are connected by a pigtail pipe 6.

[0015] After the raw material gas is distributed from the upper collector pipe 41 and enters the reforming tubes in the first pass to complete the conversion reaction, it passes through the first-pass lower collector pipe 42, the pigtail pipe 6, and the second-pass upper collector pipe 51, and then enters the reforming tubes in the second pass to continue the conversion reaction. The converter is discharged through the second-pass lower collector pipe 52.

[0016] Furthermore, considering convenient transportation, inspection and overhaul, the hydrogen production reforming furnace adopted is a horizontal rectangular furnace body, with a height of about 3 meters, and the length depends on the scale and skid size. This structure is easy to transport and inspect.

[0017] Furthermore, the flow length of the raw material gas in each pass can reach 5.5 - 6 meters, and the double pass can reach 11 - 12 meters, reaching the reforming tube length of the conventional hydrogen production reforming furnace equipment.

[0018] Furthermore, the reforming tubes have a smooth shape, a simple structure, are adaptable to thermal stress deformation, and it is convenient to load and unload catalysts by opening the end flange covers.

[0019] Effect of the utility model:

[0020] The utility model provides a two-way portal furnace tube, which is suitable for a small hydrogen production reformer and can be integrally skid-mounted, greatly reducing the on-site construction and installation workload.

[0021] The utility model provides a two-way portal furnace tube. The flow length of the raw material gas in the conversion tube is equivalent to that of a conventional device, improving the conversion rate of a small-scale device.

[0022] The utility model provides a two-way portal furnace tube. The simple and stable shape and low height of the conversion tube are conducive to operation and maintenance, overhaul, and the loading and unloading of catalysts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view schematic diagram of this hydrogen production reformer;

[0024] Figure 2 is a left view schematic diagram of this hydrogen production reformer;

[0025] Figure 3 is a top view schematic diagram of the conversion tube and the collector pipe of this hydrogen production reformer.

[0026] Among them, 1. Hydrogen production reformer; 2. Conversion tube; 3. Burner; 4. First-pass collector pipe; 41. First-pass upper collector pipe; 42. First-pass lower collector pipe; 5. Second-pass collector pipe; 51. Second-pass upper collector pipe; 52. Second-pass lower collector pipe; 6. Pig tail pipe; 7. Pig tail pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the purpose, content and advantages of the utility model clearer, the following further describes in detail the specific embodiments of the utility model with reference to the drawings and embodiments.

[0028] As Figures 1-3 shown, the purpose of the utility model is to provide a two-way portal furnace tube, including a horizontal hydrogen production reformer, a conversion tube, a collector pipe, a burner and a pig tail pipe.

[0029] The hydrogen production reformer 1 is provided with a plurality of burners 3, which are evenly arranged at the bottom to form a bottom-firing structure.

[0030] The collector pipe is divided into two passes along the flow direction of the raw material gas, namely the first-pass collector pipe 4 and the second-pass collector pipe 5. The first-pass collector pipe 4 includes a first-pass upper collector pipe 41 and a first-pass lower collector pipe 42. The first-pass upper collector pipe 41 and the first-pass lower collector pipe 42 are respectively distributed on the left and right sides of the hydrogen production reformer 1. The second-pass collector pipe 5 includes a second-pass upper collector pipe 51 and a second-pass lower collector pipe 52. The second-pass upper collector pipe 51 and the second-pass lower collector pipe 52 are respectively distributed on the right and left sides of the hydrogen production reformer 1.

[0031] The conversion tubes 2 are a number of U-shaped conversion tubes, with flange covers provided at both ends. The inside is filled with a catalyst and they are evenly arranged inside the hydrogen production reforming furnace 1. These several conversion tubes 2 are divided into two parts, namely the first pass and the second pass. The two ends of the conversion tubes in the first pass are respectively connected to the upper header 41 and the lower header 42 of the first pass through pigtail tubes 7. The two ends of the conversion tubes in the second pass are respectively connected to the upper header 51 and the lower header 52 of the second pass through pigtail tubes 7. The lower header 42 of the first pass and the upper header 51 of the second pass are connected through a pigtail tube 6.

[0032] After the raw material gas is distributed from the upper header 41 and enters the conversion tubes in the first pass to complete the conversion reaction, it passes through the lower header 42 of the first pass, the pigtail tube 6, and the upper header 51 of the second pass, and then enters the conversion tubes in the second pass to continue the conversion reaction. The converter is discharged through the lower header 52 of the second pass.

[0033] Considering the convenience of transportation, inspection, and maintenance, the hydrogen production reforming furnace adopted is a horizontal rectangular furnace body, with a height of about 3 meters, and the length depends on the scale and skid size. This structure is easy to transport and inspect.

[0034] The flow length of the raw material gas in each pass can reach 5.5 - 6 meters, and for the two passes it can reach 11 - 12 meters, achieving the conversion tube length of conventional hydrogen production reforming furnace equipment.

[0035] The conversion tubes have a smooth shape, a simple structure, are adaptable to thermal stress deformation, and it is convenient to load and unload the catalyst by opening the end flange cover.

[0036] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A two-way portal furnace tube, characterized in that: It includes a horizontal hydrogen production reforming furnace, reforming tubes, a gas collecting pipe, burners and pigtail pipes; the burners are installed in the hydrogen production reforming furnace, the gas collecting pipe is divided into two passes along the raw gas flow direction, namely the first-pass gas collecting pipe and the second-pass gas collecting pipe. The first-pass gas collecting pipe includes a first-pass upper gas collecting pipe and a first-pass lower gas collecting pipe, and the first-pass upper gas collecting pipe and the first-pass lower gas collecting pipe are respectively distributed on the left and right sides below the hydrogen production reforming furnace. The second-pass gas collecting pipe includes a second-pass upper gas collecting pipe and a second-pass lower gas collecting pipe, and the second-pass upper gas collecting pipe and the second-pass lower gas collecting pipe are respectively distributed on the right and left sides below the hydrogen production reforming furnace. The reforming tubes are a number of portal-shaped reforming tubes, which are evenly arranged inside the hydrogen production reforming furnace. The several reforming tubes are divided into two parts: the first pass and the second pass. The two ends of the reforming tubes in the first pass are respectively connected to the first-pass upper gas collecting pipe and the first-pass lower gas collecting pipe by pigtail pipes. The two ends of the reforming tubes in the second pass are respectively connected to the second-pass upper gas collecting pipe and the second-pass lower gas collecting pipe by pigtail pipes. The first-pass lower gas collecting pipe is connected to the second-pass upper gas collecting pipe by a pigtail pipe.

2. A double-pass portal furnace tube according to claim 1, characterized in that: Flange covers are provided at both ends of the reforming tubes, and the inside is filled with a catalyst.

3. A double-pass portal furnace tube according to claim 1, characterized in that: The hydrogen production reforming furnace is provided with a number of burners, which are evenly arranged at the bottom to form a bottom-firing structure.

4. A double-pass portal furnace tube according to claim 1, characterized in that: The hydrogen production reforming furnace adopts a horizontal square box furnace body with a height of 3 meters, and the length depends on the scale and skid size.

5. A double-pass portal furnace tube according to claim 1, wherein: The flow length of the raw gas in each pass reaches the length of the reforming tubes of conventional hydrogen production reforming furnace equipment.

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