Bidirectional spiral streaming high-temperature alloy radiation furnace tube as well as preparation method and application thereof

Abstract

The invention discloses a bidirectional spiral streaming high-temperature alloy radiation furnace tube as well as a preparation method and application thereof. The bidirectional spiral streaming high-temperature alloy radiation furnace tube comprises a high-temperature alloy radiation furnace tube of which the inner surface is provided with a clockwise rotating spiral groove and an anticlockwise rotating spiral groove, the diameter of the section of each spiral groove is greater than or equal to 1mm, the distance between the bottom of each spiral groove and the inner diameter of the furnace tube is 0.5-20mm, the distance between the bottom of each spiral groove and the outer surface of the furnace tube is 3-20mm, and the diameter of the section of each spiral groove is greater than or equal to 1mm. The included angle alpha between the centers of the adjacent spiral grooves is larger than 0 degree and smaller than 180 degrees, the spiral angle beta of the spiral grooves ranges from-90 degrees to 90 degrees, and the screw pitch is larger than 3 mm. Through the special inner surface bidirectional spiral structure, the contact area between a medium and the furnace tube is increased, the temperature uniformity in the furnace tube is improved, the heat conduction effect of the furnace tube is enhanced, and obvious pressure drop at the outlet of the furnace tube is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature alloy radiation furnace tubes, in particular to high-temperature alloy radiation furnace tubes with bidirectional spiral flow. Background Art

[0002] High temperature alloy radiation furnace tubes are often used in hydrogen conversion, ethylene cracking, iron ore reduction and other fields. They are the core equipment with the highest service temperature used in petrochemical and steel industries. High temperature alloy radiation furnace tubes are located inside the high temperature furnace. Through the combustion of natural gas to form heat radiation or electric heating, the heat is transferred to the inside of the furnace tube and then the gas medium inside the furnace tube undergoes chemical reactions to generate hydrogen, ethylene, propylene and other chemical products. They are key components for generating and controlling chemical reactions.

[0003] In order to improve the thermal contact area between the reaction medium and the reaction vessel, the reaction vessel is designed as a tube shape, for example, the existing hydrogen production furnace tube length is close to 14m, and the inner diameter is only about 80-120mm; the ethylene furnace tube has 1-4 pass tubes, and the total length is about 20-100 meters, and the inner diameter is only about 40-120mm. Considering the problems such as the outlet pressure drop of the manufacturing process requirements and the furnace tube, it is difficult to improve the contact area by reducing the inner and outer diameters of the furnace tube; on the other hand, when the medium gas passes through the furnace tube quickly, the medium speed slowly forms a laminar layer on the inner surface of the furnace tube, and the medium can produce a significant temperature gradient in the radial direction, forming an uneven temperature distribution. The above two problems will cause the heat transfer performance of the furnace tube to decrease, the chemical reaction efficiency in the furnace tube to decrease, and the quality and yield of the product to decrease.

[0004] To solve the above problems, some commonly used technical means are to perform special treatment on the inner surface of the furnace tube, such as welding a metal substrate on the inner surface or processing it into a special shape such as a petal shape, so as to expand the contact and heat exchange area between the furnace tube and the medium, and increase the flow effect inside the medium, thereby enhancing its heat conduction effect. However, the coverage area of ​​the welded metal substrate is limited and the pressure drop of the furnace tube is more obvious; and processing it into a petal shape only increases the inner surface area of ​​the furnace tube, and cannot produce a significant flow effect, and the improvement of heat conduction efficiency is very limited. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to propose a high-temperature alloy radiation furnace tube with a bidirectional spiral flow around the inner surface, and a preparation method and application thereof. The high-temperature alloy radiation furnace tube has a special bidirectional spiral structure on the inner surface, which can significantly increase the contact area between the medium and the furnace tube, increase the medium flow effect, improve the temperature uniformity of the medium in the furnace tube, strengthen the heat conduction effect of the furnace tube, and avoid a significant pressure drop at the furnace tube outlet.

[0006] The technical solution of the present invention is as follows: A high-temperature alloy radiation furnace tube with bidirectional spiral flow, comprising a high-temperature alloy radiation furnace tube, i.e., a spiral tube, whose inner surface is provided with bidirectional spiral grooves, i.e., bidirectional spiral grooves, wherein the bidirectional spiral grooves comprise clockwise spiral grooves and counterclockwise spiral grooves, wherein the cross-sectional circular diameter d of the spiral grooves is greater than or equal to 1 mm and smaller than the inner diameter of the furnace tube, the distance f between the bottom of the spiral groove and the inner diameter of the furnace tube is 0.5-20 mm, the distance between the bottom of the spiral groove and the outer surface of the furnace tube, i.e., the thickness t of the dense layer of the furnace tube is 3-20 mm, the angle α between the centers of adjacent spiral grooves is greater than 0° and less than 180°; the spiral angle β of the spiral grooves is between -90° and 90°, and the distance between the spiral grooves, i.e., the pitch h, is greater than 3 mm and smaller than the length of the furnace tube.

[0007] The cross-sectional circle diameter d of the spiral groove is the diameter of the circle of the cross section of the spiral groove perpendicular to the tangent direction of the center line of the spiral groove, and the spiral angle β is the angle between the tangent direction of the center line of the spiral groove and the axis of the furnace tube. Taking the medium flow as the positive direction, β is a positive spiral between 0° and 90°; and a negative spiral between 0° and -90°.

[0008] The inventor unexpectedly discovered that if a unidirectional spiral groove is used, a single vortex flow pattern is likely to form in the furnace tube, which may lead to "dead zones" or areas with low flow rates in certain areas of the pipeline, and also restrict gas mixing, especially for high-temperature gases with high viscosity, where heat and material transfer may be significantly limited; compared with straight tubes, the improvement in thermal efficiency can only reach about 3% to 10%. The technical solution of the present invention further adopts a bidirectional spiral groove method, which can disturb the fluid in different directions, making the flow more complex and forming a multi-vortex pattern, which helps to destroy the fluid boundary layer, increase the flow rate and heat exchange efficiency, and reduce the "dead zone" phenomenon, making the temperature distribution more uniform; at the same time, the spiral grooves in different directions enable the fluid to form a suitable shear force in the transition area, improve the mixing degree of the fluid, and enhance the local flow effect through the mutual influence of the flowing media in two different directions, as shown in the attached manual. Figure 7 As shown, the uniformity of the temperature field inside the furnace tube is improved; the setting of the bidirectional spiral groove can increase the thermal efficiency inside the furnace tube by more than 5% to 15%, and the pressure drop is close to the level of a straight tube or a unidirectional spiral groove tube.

[0009] According to some preferred embodiments of the present invention, the number of the spiral grooves is 4-36.

[0010] According to some preferred embodiments of the present invention, the inner diameter of the spiral tube is 50-400 mm, the cross-sectional circular diameter d of the spiral groove is 10-400 mm, the angle α between the centers of adjacent spiral grooves is 10-90°, the distance f between the bottom of the spiral groove and the inner diameter of the furnace tube is 0.5-20 mm, and the pitch h is 3-6000 mm.

[0011] The inventors unexpectedly discovered that the high-temperature alloy radiation furnace tube with bidirectional spiral flow obtained in the above preferred embodiment is particularly suitable for use as an ethylene cracking furnace tube.

[0012] More preferably, the cross-sectional diameter d of the spiral groove is 12 mm, the distance f between the bottom of the spiral groove and the inner diameter of the furnace tube is 1.5 mm, and the pitch h is 350 mm.

[0013] The inventors unexpectedly discovered that the above preferred embodiment can enable the furnace tube to obtain particularly excellent temperature uniformity and heat exchange efficiency. When it is applied to an ethylene cracking furnace, under the same output conditions, the furnace tube temperature can be lower than that of a conventional furnace tube by more than 10-20°C, which can extend the service life of the furnace tube by 1-3 years.

[0014] According to some preferred embodiments of the present invention, the distribution mode of the spiral groove on the circumference of the inner surface of the furnace tube, i.e., its rotation mode, includes any one of the following modes: a clockwise spiral groove and a counterclockwise spiral groove are alternately distributed, i.e., the spiral direction is positive, negative, and reverse, two clockwise spiral grooves and two counterclockwise spiral grooves are alternately distributed, i.e., the spiral direction is positive, positive, negative, and reverse. Preferably, a clockwise spiral groove and a counterclockwise spiral groove are alternately distributed.

[0015] According to some preferred embodiments of the present invention, the high-temperature alloy radiation furnace tube with bidirectional spiral flow also includes a high-temperature alloy radiation furnace tube with a smooth inner surface, i.e., a smooth tube. That is, the high-temperature alloy radiation furnace tube with bidirectional spiral flow includes a spiral tube and a smooth tube, wherein the spiral tube can be a spiral tube with the same inner surface structure or a spiral tube with different inner surface structures.

[0016] In practical applications, the high-temperature alloy radiation furnace tube with bidirectional spiral flow obtained in the above preferred embodiment can be as follows: the high-temperature alloy radiation furnace tube of the ethylene cracking furnace is divided into 4 consecutive passes, each pass is 12m; wherein the first pass furnace tube is the spiral tube with four spiral grooves, the second pass furnace tube is the spiral tube with eight spiral grooves, the third pass furnace tube is the spiral tube with twelve spiral grooves, and the fourth pass furnace tube is the bare tube; or, it includes a first pass furnace tube with a total length of 12m, wherein the spiral tube with twelve spiral grooves is within 6m from bottom to top, and the bare tube is above 6m.

[0017] According to some preferred embodiments of the present invention, the material of the high-temperature alloy radiation furnace tube is one or more of HP40NbMa (ZG45Ni5Cr25NbM) alloy, 35Cr45NiMa (ZG50Ni45Cr35NbM), 28Cr48Ni5W (ZG50Ni48Cr28W5) alloy and aluminum-added high-temperature alloy; wherein the HP40NbMa alloy includes 0.38-0.45wt% of C element, 0.5-1.5wt% of % Mn element, 0.5-1.5wt% Si element, 34-37wt% Ni element, 24-27wt% Cr element, 0.5-1.5wt% Nb element, 0-0.5wt% Ti element, 0-0.5wt% Zr element and the balance Fe element; the 35Cr45NiMa alloy includes 0.4-0.6wt% C element, 1-2wt% Mn element, 1-2wt% Si element, 43-47wt% Ni element, The 28Cr48Ni5W alloy comprises 0.4-0.6wt% of C, 0-1.5wt% of Mn, 0-1.5wt% of Si, 47-50wt% of Ni, 27-30wt% of Cr, 0-2wt% of Nb, 4- 6wt% of W element, 0-0.5wt% of Ti element, 0-0.5wt% of Zr element and the balance of Fe element; the aluminum-added high-temperature alloy includes 0.05-0.6wt% of C element, 0.5-2wt% of Mn element, 0.5-2wt% of Si element, 20-55wt% of Ni element, 15-40wt% of Cr element, 0-2wt% of Nb element, 4-5wt% of W element, 2-8wt% of Al element and the balance of Fe element.

[0018] According to some preferred embodiments of the present invention, the high-temperature alloy radiation furnace tube includes a plurality of tube sections, each of which has a length of less than 7 m, an outer diameter of less than 400 mm, and a wall thickness of 5-30 mm.

[0019] According to the above preferred embodiments of the present invention, the high-temperature alloy radiation furnace tube can meet different application requirements through the combination of tube sections with different numbers and / or inner surface structures.

[0020] More preferably, the pipe sections are securely connected by welding.

[0021] The present invention further provides a method for preparing the above-mentioned high-temperature alloy radiation furnace tube with bidirectional spiral flow, which comprises: boring the inner surface of the high-temperature alloy radiation furnace tube, and then obtaining the bidirectional spiral groove by machining and / or electrolysis, and then polishing the inner surface to make the intersection of the bidirectional spiral grooves smoothly transition to avoid abrupt changes in direction, and then completing visual inspection, penetration inspection, radiographic inspection and water pressure inspection, and obtaining the high-temperature alloy radiation furnace tube with bidirectional spiral flow after passing the inspection.

[0022] The high-temperature alloy radiation furnace tube with bidirectional spiral flow obtained by the present invention can be applied to a hydrogen production converter, an ethylene cracking furnace or an iron ore reduction furnace.

[0023] The present invention has the following beneficial effects: (1) The present invention can significantly increase the inner surface area of ​​the high-temperature alloy radiation furnace tube, increase the flow effect of the medium inside the furnace tube, improve its heat transfer performance, and increase its heat exchange efficiency without changing the outer diameter of the high-temperature alloy radiation furnace tube, increasing the length of the high-temperature alloy radiation furnace tube, and the weight change of the furnace tube is negligible, and the flow rate of the internal medium remains unchanged; (2) The present invention can increase the flow around the furnace tube, and is a multi-channel bidirectional flow around the furnace tube that can cover all areas inside the furnace tube. Compared with the unidirectional flow around, the flow around effect is better and the pressure drop is equivalent, so a more uniform temperature distribution can be obtained; (3) The present invention can effectively control the pressure drop at the outlet of the furnace tube while increasing the inner surface area of ​​the furnace tube, increasing the flow around, and improving the heat transfer performance of the furnace tube, thereby increasing production efficiency, and improving product quality and yield; (4) The present invention can achieve the same or higher production efficiency at a relatively low temperature, reduce production energy consumption, significantly extend the furnace tube decoking cycle, and increase annual output value; (5) The present invention can increase the effective reaction area of ​​the furnace tube, convert the traditional low temperature zone into a medium and high temperature zone, and improve the production capacity of the furnace tube; (6) Under the same production efficiency, the temperature of the furnace tube of the present invention is more than 20°C lower than that of the traditional high-temperature alloy radiation furnace tube, which can significantly extend the life of the furnace tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the test device used in the embodiment.

[0025] Figure 2 3D views of the furnace tubes with different spiral directions in the embodiment, where (a) shows spiral grooves arranged in positive, negative and reverse directions, with 3 positive spirals and β=33.7° and 3 reverse spirals and β=-33.7°; (b) shows spiral grooves arranged in positive, negative and reverse directions, with 6 positive spirals and β=33.7° and 6 reverse spirals and β=-33.7°.

[0026] Figure 3Schematic diagram of the determination of spiral parameters on the cross section in the embodiment, wherein OD represents the outer diameter of the furnace tube, ID represents the inner diameter of the furnace tube, f represents the radial distance between the bottom of the spiral groove and the inner diameter of the furnace tube, t represents the minimum dense layer thickness of the furnace tube, and α is the angle between the center position of the adjacent spiral groove at the starting position of spiral groove processing.

[0027] Figure 4 Schematic diagram of the measurement of parameters of a single spiral groove in the length direction of the furnace tube in the embodiment, wherein d represents the diameter of the circle of the spiral groove cross section perpendicular to the tangent direction of the spiral groove centerline, h represents the pitch, f represents the distance between the bottom of the spiral groove and the inner diameter of the furnace tube, β represents the angle between the tangent direction of the spiral groove centerline and the axis of the furnace tube (which leads to the forward direction of the medium), FLUX represents the forward direction of the internal medium, ID represents the inner diameter of the furnace tube, and OD represents the outer diameter of the furnace tube.

[0028] Figure 5 It is a statistical diagram of the test results of Examples 1-5.

[0029] Figure 6 It is a statistical graph of the test results of Examples 6-13.

[0030] Figure 7 It is a schematic diagram of the local flow enhancement effect of the bidirectional spiral groove on the medium flowing in two different directions in the present invention. DETAILED DESCRIPTION

[0031] The technical scheme of the present invention will be further described below in conjunction with the embodiments and drawings of the present invention. The embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] The materials of the high-temperature alloy radiation furnace tubes used in the following embodiments are HP40NbMa alloy (i.e., ZG45Ni5Cr25NbM alloy, hereinafter referred to as alloy 1), 35Cr45NiMa alloy (i.e., ZG50Ni45Cr35NbM alloy, hereinafter referred to as alloy 2), 28Cr48Ni5W alloy (i.e., ZG50Ni48Cr28W5 alloy, hereinafter referred to as alloy 3) and aluminum-added high-temperature alloy (hereinafter referred to as alloy 4), and their main constituent elements are shown in Table 1 below: Table 1 Furnace tube materials and their composition

[0033] The furnace tube used in the embodiment comprises two tube sections with identical structures, namely furnace tube 1 and furnace tube 2. Each tube section has a length of 3 m, an outer diameter of 75 mm, and an inner diameter of 63 mm. Figure 1 The test device shown was used for comparative testing.

[0034] In the test device, the furnace tubes 1 and 2 are exactly the same, the inlet of the furnace tube 1 is connected to the blower 4 through the inlet flange 3, the outlet of the furnace tube 1 is connected to the inlet of the furnace tube 2 through the elbow 5, and the outlet of the furnace tube 2 is connected to the outside of the furnace through the outlet flange 6. The furnace tubes 1, 2 and the elbow 5 are placed in a box-type heating furnace 7 as a whole. The internal temperature of the box-type heating furnace 7 is stably controlled to 800°C±3°C, and the heating is uniform and the temperature is consistent; during the test, the blower 4 continuously delivers a constant flow of air to the inside of the furnace tubes 1 and 2, the air flow rate is set to 2-12 m / s, and the air flow is stable, the temperature of the inlet air is controlled to 20°C±2°C, and the air temperature output by the blower is stable; Comparative testing included: (1) Temperature monitoring: Five thermocouples or thermocouple-type heat flow meters are welded at the inlet flange 3, outlet flange 6, the middle of furnace tubes 1 and 2, and elbow 5 to monitor the temperature change on the furnace tube surface in real time. The test records show that the temperature measured by the thermocouples at the middle of furnace tubes 1 and 2 and elbow 5 during the test was 800°C ±3°C, indicating that the surface temperature of the furnace tube is stable; (2) Stress test: Pressure sensors are installed at the inlet flange 3 and the outlet flange 6 to calculate the pressure drop of the gas when it flows through the furnace tube; (3) Outlet temperature measurement: Temperature sensors are installed at the inlet flange 3 and the outlet flange 6 to measure the temperature of the air after it flows through the furnace tube. After the furnace tube surface temperature and the outlet gas temperature reach a stable state, the outlet temperature of the air is recorded.

[0035] Examples 1-5 The pressure drop and outlet temperature of high-temperature alloy radiation furnace tubes with bidirectional spiral flow (hereinafter referred to as spiral tubes) with different spiral groove numbers, spiral directions and spiral parameters at different wind speeds were tested, and compared with high-temperature alloy radiation furnace tubes with the same material size and no special shape on the inner surface (hereinafter referred to as plain tubes). The results are shown in Table 2 and attached. Figure 5 As shown: Table 2 Test results of Examples 1-5

[0036] Among them, the reference example Figure 2-4 , the spiral direction β is clockwise, i.e., the positive direction, and counterclockwise, i.e., the negative direction, d represents the diameter of the spiral groove, f represents the distance between the bottom of the spiral groove and the inner diameter of the furnace tube, and h represents the pitch.

[0037] In the above embodiments, embodiment 1 is a light tube, embodiment 2 is a single helical tube, and embodiments 3, 4, and 5 are double helical tubes with different arrangement directions and numbers of helical grooves. Figure 5 From the curve, it can be found that as the number of spiral grooves increases, the heat conduction effect of the medium inside the furnace tube is significantly improved, the outlet temperature of the furnace tube is significantly increased, and the outlet pressure drop of the furnace tube is slightly increased, but the absolute value of the increase is negligible. When the number of spiral grooves is constant, the heat conduction effect of alternating positive and negative is better than that of alternating positive and negative, and is better than that of unidirectional spiral.

[0038] Embodiment 6-13 The heat exchange efficiency of high-temperature alloy radiation furnace tubes with bidirectional spiral flow (hereinafter referred to as spiral tubes) with different spiral groove numbers, spiral directions and spiral parameters at different wind speeds was measured and compared with high-temperature alloy radiation furnace tubes with the same material size and no special shape on the inner surface (hereinafter referred to as plain tubes). The results are shown in Table 3 and attached. Figure 6 As shown: Table 3 Test results of Examples 6-13

[0039] From Table 3 and Figure 6 It can be seen that for the same wind speed, the heat exchange efficiency obtained by the experiment of the furnace tube with a bidirectional spiral groove design is higher than that of the plain tube. As the wind speed increases, the heat exchange efficiency of the spiral tube and the plain tube increases, but the increase of the spiral tube is greater. In Example 9, the heat exchange efficiency reaches 85%, which is the best effect.

[0040] The heat exchange efficiency is calculated as follows: Where: Q 空气 is the heat absorbed by the air, Q 总输入 is the total energy absorbed by the outer surface of the furnace tube; In steady state:

[0041] in, Indicates the mass flow rate of air (kg / s), that is, the mass of air passing through the furnace tube per second. The calculation formula is:

[0042] Where ρ represents the air density (kg / m 3 ), under test conditions, 1.2 kg / m 3 ; v represents the air velocity (m / s), which is 2-12 m / s under test conditions, and A represents the inner cross-sectional area of ​​the furnace tube (m 2 ); Indicates the specific heat capacity of air at constant pressure (kJ / (kg\K)). Under test conditions, the value is 1.005 kJ / (kg\K) represents the outlet temperature (K); Indicates the inlet temperature (K), which is 293K (corresponding to 20°C) under test conditions

[0043] in, It represents the heat flux density per unit area of ​​the furnace tube, which is obtained by a thermocouple heat flux meter. S represents the total surface area of ​​the furnace tube (ignoring the elbow, calculated by 2πrL). t represents the steady-state time, which is set according to the test settings.

[0044] Examples 14-15 A spiral tube with the same inner and outer diameters as in Examples 1-4 was used, the number of spiral grooves was 6, and the spiral direction was square and reverse. Under the condition of a wind speed of 4 m / s, the spiral parameters were changed for testing (using Examples 1 and 4 as comparisons). The test results are shown in Table 4 below: Table 4 Test results of Examples 14-15

[0045] It can be seen from Table 4 that the outlet temperature increases with the increase of f. Among them, when the groove depth of Example 14 is 0.8 mm, its outlet temperature is slightly higher than that of the light tube, and the outlet pressure drop is consistent with that of the light tube; the outlet pressure drop does not change significantly when the pitch is 350-1050 mm. Combined with the actual production situation, the spiral tube of Example 3 has the best effect.

[0046] It should be noted that the above is only a preferred embodiment of the present invention, which should not limit the protection scope of the technical solution of the present invention. Any modification of the technical solution recorded in the above embodiments and equivalent replacement of technical features by ordinary technicians in the field within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature alloy radiation furnace tube with bidirectional spiral flow, characterized in that: The invention comprises a high-temperature alloy radiation furnace tube, i.e. a spiral tube, whose inner surface is provided with bidirectional spiral grooves, i.e. bidirectional spiral grooves, wherein the bidirectional spiral grooves comprise clockwise spiral grooves and counterclockwise spiral grooves, wherein the cross-sectional circular diameter d of the spiral grooves is greater than or equal to 1 mm and smaller than the inner diameter of the furnace tube, the distance f between the bottom of the spiral groove and the inner diameter of the furnace tube is 0.5-20 mm, the distance between the bottom of the spiral groove and the outer surface of the furnace tube, i.e. the thickness t of the dense layer of the furnace tube is 3-20 mm, the angle α between the centers of adjacent spiral grooves is greater than 0° and less than 180°, the spiral angle β of the spiral grooves is -90°~90°, and the distance between the spiral grooves, i.e. the pitch h, is greater than 3 mm and smaller than the length of the furnace tube.

2. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to claim 1 is characterized in that: The number of the spiral grooves is 4-36.

3. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to claim 1, characterized in that: The inner diameter of the spiral tube is 50-400 mm, the cross-sectional diameter d of the spiral groove is 10-400 mm, the angle α between the centers of adjacent spiral grooves is 10-90°, the distance f between the bottom of the spiral groove and the inner diameter of the furnace tube is 0.5-20 mm, and the pitch h is 3-6000 mm.

4. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to claim 1, characterized in that: The distribution mode of the spiral groove on the circumference of the inner surface of the furnace tube, that is, its rotation mode, includes any one of the following modes: one clockwise rotating spiral groove and one counterclockwise rotating spiral groove are alternately distributed, and two clockwise rotating spiral grooves and two counterclockwise rotating spiral grooves are alternately distributed.

5. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to claim 1, characterized in that: It also includes a high-temperature alloy radiation furnace tube with a smooth inner surface, namely a smooth tube.

6. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to claim 5, characterized in that: It includes four consecutive furnace tubes, each of which is 12 meters long, wherein the first furnace tube is a spiral tube with four spiral grooves, the second furnace tube is a spiral tube with eight spiral grooves, the third furnace tube is a spiral tube with twelve spiral grooves, and the fourth furnace tube is a smooth tube; or, it includes one furnace tube with a total length of 12 meters, wherein the spiral tube with twelve spiral grooves is within 6 meters from bottom to top, and the tube above 6 meters is a smooth tube.

7. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to any one of claims 1 to 6, characterized in that: The high-temperature alloy radiation furnace tube comprises a plurality of tube sections, each of which has a length of less than 7 m, an outer diameter of less than 400 mm, and a wall thickness of 5-30 mm.

8. The high-temperature alloy radiation furnace tube with bidirectional spiral flow according to any one of claims 1 to 6, characterized in that: The material of the high-temperature alloy radiation furnace tube is one or more of HP40NbMa alloy, 35Cr45NiMa alloy, 28Cr48Ni5W alloy or aluminum-added high-temperature alloy; wherein the HP40NbMa alloy includes 0.38-0.45wt% of C element, 0.5-1.5wt% of Mn element, 0.5-1.5wt% of Si element, 34-37wt% of Ni element, 24-27wt% of Cr element, 0.5-1.5wt% of Nb element, 0-0.5wt% of Ti element, 0-0.5wt% of Zr element and the balance of Fe element; the 35Cr45NiMa alloy includes 0.4-0.6wt% of C element, 1-2wt% of Mn element, 1-2wt% of Si element, 43-47wt% of Ni element, 33-37wt% of Cr element, 0.7-1.5wt% of Nb element, 1-2wt% of The 28Cr48Ni5W alloy comprises 0.4-0.6wt% of C, 0-1.5wt% of Mn, 0-1.5wt% of Si, 47-50wt% of Ni, 27-30wt% of Cr, 0-2wt% of Nb, 4-6wt% of W, 0-0.5wt% of Ti, 0-0.5wt% of Zr and the balance of Fe; the aluminum-added high-temperature alloy comprises 0.05-0.6wt% of C, 0.5-2wt% of Mn, 0.5-2wt% of Si, 20-55wt% of Ni, 15-40wt% of Cr, 0-2wt% of Nb, 4-5wt% of W, 2-8wt% of Al and the balance of Fe.

9. The method for preparing a high-temperature alloy radiation furnace tube with bidirectional spiral flow according to any one of claims 1 to 8, characterized in that: It includes: The inner surface of the high-temperature alloy radiation furnace tube is bored, and then the bidirectional spiral groove is obtained by machining and / or electrolysis, and then the inner surface is polished to make the intersection of the bidirectional spiral grooves have a smooth transition, and then visual inspection, penetration inspection, radiographic inspection and water pressure inspection are carried out. After passing the inspection, the high-temperature alloy radiation furnace tube with bidirectional spiral flow is obtained.

10. Use of the high-temperature alloy radiation furnace tube with bidirectional spiral flow according to any one of claims 1 to 8 in a hydrogen production converter, an ethylene cracking furnace or an iron ore reduction furnace.

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