Converter vaporization flue device with composite enhanced heat exchange and converter waste heat recovery system

Abstract

The present invention discloses a converter vaporization flue device with composite enhanced heat exchange and a converter waste heat recovery system, comprising: a heat exchange flue pipe having a smoke inlet end and a smoke outlet end; a convection heat exchange mechanism, comprising a plurality of convection heat exchange tubes, a water inlet structure and a drainage structure, wherein the plurality of convection heat exchange tubes are arranged in the heat exchange flue pipe at intervals, and the two ends of the convection heat exchange tubes are respectively connected to the water inlet structure and the drainage structure, and the water inlet structure is arranged close to the smoke outlet end, and the drainage structure is arranged close to the smoke inlet end. In the converter vaporization flue device with composite enhanced heat exchange of the present invention, high-temperature flue gas enters the heat exchange flue pipe from the smoke inlet end of the heat exchange flue pipe, and by arranging the convection heat exchange mechanism, the water inlet structure transports cooling water to the plurality of convection heat exchange tubes, so that the water flow in the plurality of convection heat exchange tubes is convectionally exchanged with the high-temperature flue gas in the heat exchange flue pipe and then discharged from the drainage structure, the heat exchange efficiency is high, a large amount of sensible heat in the high-temperature flue gas can be recycled, and the water content of the flue gas will not be affected.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas waste heat recovery, and in particular to a converter vaporization flue device with composite enhanced heat exchange and a converter waste heat recovery system. Background Art

[0002] Converter steelmaking is the main steelmaking process in the world today. Converter steelmaking produces a large amount of high-temperature flue gas (furnace mouth flue temperature 1500℃~1600℃). Due to the particularity of the production process, converter flue gas has the following characteristics compared with conventional medium and low temperature flue gas: high dust content, generally up to 100mg / m 3 ~150 mg / m 3 ; The flue gas contains up to 85% CO, which poses an explosion risk. In the current converter gas recovery process, the outlet flue gas temperature of the vaporization cooling flue is 800℃~900℃, and then the flue gas is cooled to about 250℃ by water spray cooling (OG method) or spray cooling (LT method) before entering the dust removal facility, resulting in the sensible heat of the flue gas at 250℃~800℃ not being utilized, and a large amount of water resources or steam and nitrogen will be wasted in the process of water spraying or spraying. Water spraying or spraying will also increase the water content in the converter gas, resulting in wet gas, which affects its utilization value. Summary of the invention

[0003] The purpose of the present invention is to provide a converter vaporization flue device with composite enhanced heat exchange and a converter waste heat recovery system to solve the technical problems that a large amount of sensible heat in the flue gas generated by existing converter steelmaking cannot be utilized, and wet coal gas is generated in the converter by water spraying or mist cooling.

[0004] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0005] The present invention provides a converter vaporization flue device with composite enhanced heat exchange, comprising: a heat exchange flue pipe, having a smoke inlet end and a smoke outlet end; a convection heat exchange mechanism, comprising a plurality of convection heat exchange tubes, a water inlet structure and a drainage structure, wherein the plurality of convection heat exchange tubes are arranged at intervals in the heat exchange flue pipe, the two ends of the convection heat exchange tubes are respectively connected to the water inlet structure and the drainage structure, and the water inlet structure is arranged close to the smoke outlet end, and the drainage structure is arranged close to the smoke inlet end; a radiation heat exchange structure is arranged on the tube wall of the heat exchange flue pipe.

[0006] In an embodiment of the present invention, the convection heat exchange tube is arranged along the axial direction of the heat exchange smoke tube, and the water flow direction in the convection heat exchange tube is opposite to the smoke flow direction in the heat exchange smoke tube.

[0007] In an embodiment of the present invention, the temperature of the flue gas entering from the flue gas inlet end is 650°C to 900°C.

[0008] In an embodiment of the present invention, at least one heat exchange fin is provided on the outer wall surface of the convection heat exchange tube along its axial direction, and the arrangement direction of the heat exchange fin is perpendicular to the line connecting the center of the convection heat exchange tube and the center of the heat exchange smoke tube.

[0009] In an embodiment of the present invention, both ends of the convection heat exchange tube are provided with bending tubes, the bending tubes are bent toward the center of the heat exchange smoke tube, and the two ends of the convection heat exchange tube are respectively connected to the water inlet structure and the drainage structure through the bending tubes.

[0010] In an embodiment of the present invention, the angle between the axis of the bent tube and the axis of the convection heat exchange tube is 30 degrees to 90 degrees.

[0011] In an embodiment of the present invention, a plurality of convection heat exchange layers are arranged at intervals along the radial direction in the heat exchange smoke tube, and the convection heat exchange layer includes a plurality of the convection heat exchange tubes.

[0012] In an embodiment of the present invention, the water inlet structure includes a water inlet distribution structure, the water inlet distribution structure has an inner extending water distribution portion located in the heat exchange smoke tube, and the inner extending water distribution portion is connected to the water inlet ends of the multiple convection heat exchange tubes; the drainage structure includes a drainage water distribution structure, the drainage water distribution structure has an inner extending water portion located in the heat exchange smoke tube, and the inner extending water portion is connected to the water outlet ends of the multiple convection heat exchange tubes.

[0013] In an embodiment of the present invention, there are multiple water inlet distribution structures, and the multiple water inlet distribution structures are arranged at intervals along the radial direction of the heat exchange smoke pipe, and the inner extending water distribution part of each water inlet distribution structure is connected to at least one of the convective heat exchange layers; there are multiple drainage water distribution structures, and the multiple drainage water distribution structures are arranged at intervals along the radial direction of the heat exchange smoke pipe, and the inner extending water part of each drainage water distribution structure is connected to at least one of the convective heat exchange layers.

[0014] In an embodiment of the present invention, the water inlet structure also includes a water inlet supply structure, which is installed outside the heat exchange smoke pipe, and the water inlet distribution structure has an externally extending water inlet portion located outside the heat exchange smoke pipe, and the water inlet supply structure is connected with the internally extending water distribution portion through the externally extending water inlet portion; the drainage structure also includes a drainage collecting structure, which is installed outside the heat exchange smoke pipe, and the drainage distribution structure has an externally extending water outflow portion located outside the heat exchange smoke pipe, and the drainage collecting structure is connected with the internally extending water outflow portion through the externally extending water outflow portion.

[0015] In an embodiment of the present invention, the length of the outwardly extending water inlet portion of each water inlet and water distribution structure is equal; the length of the outwardly extending water outlet portion of each water drainage and water distribution structure is equal.

[0016] In an embodiment of the present invention, the number of the outwardly extending water inlet parts of each water inlet and water distribution structure is two, the number of the water inlet and water supply structures is two, and the two water inlet and water supply structures are respectively connected to the two outwardly extending water inlet parts of each water inlet and water distribution structure; the number of the outwardly extending water outlet parts of each drainage and water distribution structure is two, the number of the drainage collecting structures is two, and the two drainage collecting structures are respectively connected to the two outwardly extending water outlet parts of each water inlet and water distribution structure.

[0017] In an embodiment of the present invention, the radiation heat exchange structure includes a plurality of radiation heat exchange tubes, and the plurality of radiation heat exchange tubes are arranged along the circumference of the heat exchange smoke tube.

[0018] The present invention also provides a converter waste heat recovery system, comprising the above-mentioned converter vaporization flue device with composite enhanced heat exchange.

[0019] The characteristics and advantages of the present invention are:

[0020] In the composite enhanced heat exchange converter vaporization flue device of the present invention, high-temperature flue gas enters the heat exchange smoke pipe from the smoke inlet end of the heat exchange smoke pipe, and a convection heat exchange mechanism is provided so that the water inlet structure transports cooling water from a position close to the smoke outlet end to a plurality of convection heat exchange tubes arranged at intervals in the heat exchange smoke pipe, so that the water flow in the plurality of convection heat exchange tubes undergoes convection heat exchange with the high-temperature flue gas in the heat exchange smoke pipe and is then discharged from the drainage structure close to the smoke inlet end, with high heat exchange efficiency, so that a large amount of sensible heat in the high-temperature flue gas can be recycled and utilized, and the water content of the flue gas will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic structural diagram of the converter vaporization flue device with composite enhanced heat exchange close to the smoke outlet end of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the converter vaporization flue device with composite enhanced heat exchange close to the smoke inlet end of the present invention.

[0024] Figure 3 for Figure 2 Cross-section view of AA.

[0025] Figure 4 for Figure 2 Cross-section of the BB.

[0026] Figure 5 It is a partial enlarged view of the converter vaporization flue device with composite enhanced heat exchange of the present invention.

[0027] Figure 6 It is a schematic structural diagram of the convection heat exchange tube of the present invention.

[0028] Figure 7 This is a structural schematic diagram of the converter vaporization flue device with composite enhanced heat exchange of the present invention installed on the smoke exhaust pipe.

[0029] In the figure:

[0030] 100. Converter vaporization flue device with composite enhanced heat exchange; 1. heat exchange flue pipe; 11. smoke inlet end; 12. smoke outlet end; 13. radiation heat exchange tube; 2. convection heat exchange mechanism; 21. convection heat exchange tube; 22. convection heat exchange layer; 221. first convection heat exchange layer; 222. second convection heat exchange layer; 223. third convection heat exchange layer; 224. fourth convection heat exchange layer; 225. fifth convection heat exchange layer; 226. sixth convection heat exchange layer; 227. seventh convection heat exchange layer; 228. eighth convection heat exchange layer; 229. ninth convection heat exchange layer; 23. bent tube; 24. heat exchange fin; 3. water inlet structure; 31. water inlet and distribution structure; 311. inner extension water distribution part; 312. outer extension water inlet part; 313. first water inlet and distribution structure; 314. second water inlet Water distribution structure; 315, the third water inlet and distribution structure; 316, the fourth water inlet and distribution structure; 317, the fifth water inlet and distribution structure; 318, the sixth water inlet and distribution structure; 319, the seventh water inlet and distribution structure; 32, the water inlet and supply structure; 4, the drainage structure; 41, the drainage and distribution structure; 411, the inner extension of the water outlet; 412, the outer extension of the water outlet; 413, the first drainage and distribution structure; 414, the second drainage and distribution structure; 415, the third drainage and distribution structure; 316, the fourth drainage and distribution structure; 417, the fifth drainage and distribution structure; 418, the sixth drainage and distribution structure; 419, the seventh drainage and distribution structure; 42, the drainage collection structure; 200, the smoke exhaust duct; 201, the high temperature section; 202, the medium temperature section; 203, the low temperature section; 300, the smoke exhaust port. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 are within the scope of protection of the present invention.

[0032] Implementation Method 1

[0033] like Figure 1 and Figure 2 As shown, the present invention provides a converter vaporization flue device 100 with composite enhanced heat exchange, comprising: a heat exchange flue pipe 1, having a smoke inlet end 11 and a smoke outlet end 12; a convection heat exchange mechanism 2, comprising a plurality of convection heat exchange tubes 21, a water inlet structure 3 and a drainage structure 4, the plurality of convection heat exchange tubes 21 are arranged at intervals in the heat exchange flue pipe 1, the two ends of the convection heat exchange tubes 21 are respectively connected to the water inlet structure 3 and the drainage structure 4, and the water inlet structure 3 is arranged close to the smoke outlet end 12, and the drainage structure 4 is arranged close to the smoke inlet end 11; a radiation heat exchange structure is arranged on the tube wall of the heat exchange flue pipe 1.

[0034] In the composite heat exchange enhanced converter vaporization flue device 100 of the present invention, the high-temperature flue gas enters the heat exchange flue 1 from the smoke inlet end 11 of the heat exchange flue 1. By setting a convection heat exchange mechanism 2, the water inlet structure 3 transports the water flow from the position near the smoke outlet end 12 to the multiple convection heat exchange tubes 21 arranged at intervals in the heat exchange flue 1, so that the water flow in the multiple convection heat exchange tubes 21 and the high-temperature flue gas in the heat exchange flue 1 are convectionally exchanged and then discharged from the drainage structure 4 near the smoke inlet end 11. The heat exchange efficiency is high, so that a large amount of sensible heat in the high-temperature flue gas can be recycled and utilized, and the water content of the flue gas will not be affected. In addition, the radiation heat exchange structure absorbs the radiation heat of the flue gas in the heat exchange flue 1, which further improves the heat exchange efficiency of the composite heat exchange enhanced converter vaporization flue device 100 and the recovery rate of heat in the flue gas.

[0035] Specifically, Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the heat exchange smoke tube 1 is generally in the shape of a circular tube. Multiple convection heat exchange tubes 21 are evenly spaced and arranged in the heat exchange smoke tube 1, so that the multiple convection heat exchange tubes 21 are evenly heated, and the distribution area of ​​the multiple convection heat exchange tubes 21 is slightly smaller than the volume of the entire channel in the heat exchange smoke tube 1, ensuring that the flue gas in each area of ​​the heat exchange smoke tube 1 can be convectively exchanged with the water flow in the nearby convection heat exchange tubes 21. Figure 7 As shown, the heat exchange smoke pipe 1 is installed on the smoke exhaust pipe 200 of the device. Optionally, the smoke inlet end 11 of the heat exchange smoke pipe 1 is directly connected to the smoke exhaust port 300 of the device.

[0036] In an embodiment of the present invention, the convection heat exchange tube 21 is arranged along the axial direction of the heat exchange smoke tube 1, and the water flow direction in the convection heat exchange tube 21 is opposite to the flue gas flow direction in the heat exchange smoke tube 1. The water flow in the convection heat exchange tube 21 always has a certain temperature difference with the surrounding flowing flue gas during the flow process, thereby continuously absorbing the heat in the flue gas, thereby improving the convection heat exchange effect between the water flow in the convection heat exchange tube 21 and the flue gas in the heat exchange smoke tube 1, and the dust in the smoke will be discharged from the heat exchange smoke tube 1 along the channels between the multiple convection heat exchange tubes 21, and will not be deposited on the outer wall surface of the convection heat exchange tube 21, thereby avoiding the risk of explosion caused by dust accumulation in the heat exchange smoke tube 1.

[0037] Specifically, the heat exchange tube 1 is a straight tube, that is, there is no bend on the heat exchange tube 1, and the convection heat exchange tube 21 is arranged along the axial direction of the heat exchange tube 1, so as to avoid dust accumulation at the bend.

[0038] In the embodiment of the present invention, the temperature of the flue gas entering from the smoke inlet end 11 is 650°C to 900°C. The convective heat exchange effect between the flue gas at 650°C to 900°C and the water flow in the convective heat exchange smoke pipe 1 is the best. Figure 7 As shown, the exhaust pipe 200 of the equipment forms a high temperature section 201, a medium temperature section 202, and a low temperature section 203 in the direction of the flow of the flue gas. The temperature of the flue gas in the high temperature section 201 is 900°C to 1500°C. The temperature of the flue gas in the medium temperature section 202 is 650°C to 900°C. The heat exchange smoke pipe 1 is installed in the medium temperature section 202 of the exhaust pipe 200, and the heat exchange effect is the best. The flue gas can be cooled to below 200°C and then transported to the low temperature section 203.

[0039] In the embodiment of the present invention, Figure 5 and Figure 6 As shown, at least one heat exchange fin 24 is provided on the outer wall surface of the convection heat exchange tube 21 along its axial direction, and the arrangement direction M of the heat exchange fin 24 is perpendicular to the line N connecting the center of the convection heat exchange tube 21 and the center of the heat exchange smoke tube 1. By adding the heat exchange fin 24 on the outer wall surface of the convection heat exchange tube 21, the heat exchange fin 24 conducts the heat in the flue gas to the water flow in the convection heat exchange tube 21 more quickly. The arrangement direction M of the heat exchange fin 24 is perpendicular to the line N connecting the center of the convection heat exchange tube 21 and the center of the heat exchange smoke tube 1, that is, the arrangement direction M of the heat exchange fin 24 is parallel to the tangent direction P of the heat exchange smoke tube 1, so that the dust in the flue gas can be discharged from the heat exchange smoke tube 1 along the channel between the inner wall surface of the heat exchange smoke tube 1 and the heat exchange fin 24 and the channel between multiple heat exchange fins 24, thereby preventing the dust from being deposited on the heat exchange fin 24 when flowing along the circumferential direction of the heat exchange smoke tube 1. Specifically, two heat exchange fins 24 are arranged opposite to each other on the outer wall surface of each convection heat exchange tube 21 .

[0040] In the embodiment of the present invention, Figure 4As shown, both ends of the convection heat exchange tube 21 are provided with a bending tube 23, and the bending tube 23 is bent toward the center of the heat exchange smoke tube 1. The two ends of the convection heat exchange tube 21 are connected to the water inlet structure 3 and the drainage structure 4 respectively through the bending tube 23. The two ends of the convection heat exchange tube 21 are connected to the water inlet structure 3 and the drainage structure 4 respectively through the bending tube 23, and the elastic deformation of the bending tube 23 is used to compensate for the thermal expansion of the convection heat exchange tube 21 when heated, thereby reducing the influence of the stress generated by the thermal expansion of the convection heat exchange tube 21. In addition, the bending tubes 23 of the multiple convection heat exchange tubes 21 are all bent toward the center of the heat exchange smoke tube 1, which is conducive to guiding the smoke from the outside of the bending tube 23 near the smoke inlet end 11 into the channel between the multiple convection heat exchange tubes 21, and finally guiding the smoke from the outside of the bending tube 23 near the smoke outlet end 12 to flow out of the heat exchange smoke tube 1, thereby avoiding the dust in the smoke from being deposited at the bending tube 23.

[0041] Specifically, Figure 4 As shown, the angle θ between the axis Z2 of the bent tube 23 and the axis Z1 of the convection heat exchange tube 21 is 30 degrees to 90 degrees. Preferably, the angle θ is 45 degrees, which ensures that the bent tube 23 compensates for the thermal expansion of the convection heat exchange tube 21 when heated, while avoiding the deposition of dust in the flue gas on the bent tube 23 due to excessive bending angle.

[0042] In the embodiment of the present invention, Figure 1 and Figure 2 As shown, a plurality of convection heat exchange layers 22 are arranged radially in the heat exchange smoke tube 1, and the convection heat exchange layers 22 include a plurality of convection heat exchange tubes 21. The plurality of convection heat exchange layers 22 respectively conduct convection heat exchange with the flue gas in different areas of the heat exchange smoke tube 1, so that the heat in the flue gas in each area can be recovered and utilized.

[0043] Specifically, Figure 1 and Figure 2 As shown, nine convection heat exchange layers 22 are evenly arranged in the heat exchange smoke tube 1, namely, a first convection heat exchange layer 221, a second convection heat exchange layer 222, a third convection heat exchange layer 223, a fourth convection heat exchange layer 224, a fifth convection heat exchange layer 225, a sixth convection heat exchange layer 226, a seventh convection heat exchange layer 227, an eighth convection heat exchange layer 228, and a ninth convection heat exchange layer 229. The number of convection heat exchange tubes 21 in the first convection heat exchange layer 221, the second convection heat exchange layer 222, the third convection heat exchange layer 223, and the fourth convection heat exchange layer 224 increases in sequence; the number of convection heat exchange tubes 21 in the fifth convection heat exchange layer 225 is the largest; the number of convection heat exchange tubes 21 in the sixth convection heat exchange layer 226, the seventh convection heat exchange layer 227, the eighth convection heat exchange layer 228, and the ninth convection heat exchange layer 229 decreases in sequence.

[0044] In an embodiment of the present invention, the water inlet structure 3 includes a water inlet distribution structure 31, which has an inner extending water distribution portion 311 located in the heat exchange smoke tube 1, and the inner extending water distribution portion 311 is connected to the water inlet ends of the multiple convection heat exchange tubes 21; the drainage structure 4 includes a drainage water distribution structure 41, which has an inner extending water portion 411 located in the heat exchange smoke tube 1, and the inner extending water portion 411 is connected to the water outlet ends of the multiple convection heat exchange tubes 21. The cooling water is distributed to the multiple convection heat exchange tubes 21 through the inner extending water distribution portion 311 of the water inlet distribution structure 31 to exchange heat with the flue gas in the heat exchange smoke tube 1, and the water flow absorbs the heat in the flue gas and is discharged from the inner extending water portion 411. Specifically, the inner extending water distribution portion 311 and the inner extending water portion 411 are generally tubular structures. The inner extending water distribution part 311 is provided with a plurality of water distribution ports along its axial direction, and the plurality of water distribution ports are connected to the water inlet ends of the plurality of convection heat exchange tubes 21. The inner extending water distribution part 411 is provided with a plurality of water outlets along its axial direction, and the plurality of water outlets are connected to the water outlet ends of the plurality of convection heat exchange tubes 21.

[0045] There are multiple water inlet distribution structures 31, which are arranged at intervals along the radial direction of the heat exchange smoke pipe 1, and the inner extension water distribution part 311 of each water inlet distribution structure 31 is connected to at least one convective heat exchange layer 22; there are multiple water drainage distribution structures 41, which are arranged at intervals along the radial direction of the heat exchange smoke pipe 1, and the inner extension water part 411 of each water drainage distribution structure 41 is connected to at least one convective heat exchange layer 22. The cooling water is quickly distributed to the multiple convective heat exchange layers 22 through the multiple water inlet distribution structures 31, and the water flow that has absorbed heat in the multiple convective heat exchange layers 22 is quickly discharged through the multiple water drainage distribution structures 41, thereby improving the heat exchange efficiency of the convective heat exchange mechanism 2. In addition, the inner extending water distribution parts 311 of the multiple water inlet and water distribution structures 31 are arranged in a staggered manner with the multiple convection heat exchange layers 22, so that the flue gas can flow from the channels between the multiple inner extending water distribution parts 311 into the channels between the multiple convection heat exchange smoke pipes 1 in each convection heat exchange layer 22, and then perform convection heat exchange with the water flow in the convection heat exchange smoke pipe 1. The inner extending water parts 411 of the multiple water discharge and water distribution structures 41 are arranged in a staggered manner with the multiple convection heat exchange layers 22, so that the flue gas after heat exchange can flow from the channels between the multiple convection heat exchange smoke pipes 1 in each convection heat exchange layer 22 into the channels between the multiple inner extending water parts 411, and then be smoothly discharged from the smoke outlet end 12 of the heat exchange smoke pipe 1.

[0046] Specifically, Figure 1 and Figure 4As shown, seven water inlet and water distribution structures 31 are arranged at intervals along the radial direction of the heat exchange smoke pipe 1, namely, the first water inlet and water distribution structure 313, the second water inlet and water distribution structure 314, the third water inlet and water distribution structure 315, the fourth water inlet and water distribution structure 316, the fifth water inlet and water distribution structure 317, the sixth water inlet and water distribution structure 318, and the seventh water inlet and water distribution structure 319. The inner extending water distribution part of the first water inlet and water distribution structure 313, the inner extending water distribution part of the second water inlet and water distribution structure 314, and the inner extending water distribution part of the third water inlet and water distribution structure 315 are respectively connected to the first convection heat exchange layer 221, the second convection heat exchange layer 222, and the third convection heat exchange layer 223. The inner extending water distribution part of the fourth water inlet and water distribution structure 316 is connected to the fourth convection heat exchange layer 224, the fifth convection heat exchange layer 225, and the sixth convection heat exchange layer 226. The inner extending water distribution part of the fifth water inlet and water distribution structure 317, the inner extending water distribution part of the sixth water inlet and water distribution structure 318, and the inner extending water distribution part of the seventh water inlet and water distribution structure 319 are respectively connected to the seventh convective heat exchange layer 227, the eighth convective heat exchange layer 228, and the ninth convective heat exchange layer 229.

[0047] Specifically, Figure 2 and Figure 4 As shown, seven drainage and water distribution structures 41 are arranged at intervals along the radial direction of the heat exchange smoke pipe 1, namely, the first drainage and water distribution structure 413, the second drainage and water distribution structure 414, the third drainage and water distribution structure 415, the fourth drainage and water distribution structure 416, the fifth drainage and water distribution structure 417, the sixth drainage and water distribution structure 418, and the seventh drainage and water distribution structure 419. The inner protruding water portion of the first drainage and water distribution structure 413, the inner protruding water portion of the second drainage and water distribution structure 414, and the inner protruding water portion of the third drainage and water distribution structure 415 are respectively connected to the first convection heat exchange layer 221, the second convection heat exchange layer 222, and the third convection heat exchange layer 223. The inner protruding water portion of the fourth drainage and water distribution structure 416 is connected to the fourth convection heat exchange layer 224, the fifth convection heat exchange layer 225, and the sixth convection heat exchange layer 226. The inner protruding water portion of the fifth drainage and water distribution structure 417, the inner protruding water portion of the sixth drainage and water distribution structure 418, and the inner protruding water portion of the seventh drainage and water distribution structure 419 are respectively connected to the seventh convection heat exchange layer 227, the eighth convection heat exchange layer 228, and the ninth convection heat exchange layer 229.

[0048] In the embodiment of the present invention, the water inlet structure 3 further includes a water inlet supply structure 32, which is installed outside the heat exchange smoke pipe 1, and the water inlet distribution structure 31 has an externally extending water inlet portion 312 located outside the heat exchange smoke pipe 1, and the water inlet supply structure 32 is connected to the internally extending water distribution portion 311 through the externally extending water inlet portion 312; the drainage structure 4 further includes a drainage collection structure 42, which is installed outside the heat exchange smoke pipe 1, and the drainage distribution structure 41 has an externally extending water distribution portion 412 located outside the heat exchange smoke pipe 1, and the drainage collection structure 42 is connected to the internally extending water distribution portion 411 through the externally extending water distribution portion 412. The cooling water in the water inlet supply structure 32 is transported to the internally extending water distribution portion 311 through the externally extending water inlet portion 312, and then distributed to the plurality of convection heat exchange tubes 21, and the water flow that absorbs heat in the internally extending water distribution portion 411 is transported to the drainage collection structure 42 through the externally extending water distribution portion 412. Specifically, the water inlet and supply structure 32 and the drainage and collection structure 42 are both generally box structures.

[0049] like Figure 1 and Figure 2 As shown, the length of the outwardly extending water inlet portion 312 of each water inlet and water distribution structure 31 is equal; the length of the outwardly extending water outlet portion 412 of each water drainage and water distribution structure 41 is equal. The cooling water output by the water inlet and water supply structure 32 is simultaneously transported to the inner extending water distribution portion 311 located in the heat exchange smoke pipe 1 through the outwardly extending water inlet portions 312 of multiple water inlet and water distribution structures 31. The water that has absorbed heat in the inner extending water outlet portions 411 of multiple water drainage and water distribution structures 41 is simultaneously transported to the drainage collection structure 42 through the outwardly extending water outlet portions 412. Specifically, the radial cross-sections of the water inlet and water supply structure 32 and the drainage collection structure 42 are arc-shaped and are concentric with the heat exchange smoke pipe 1.

[0050] The number of the externally extending water inlet parts 312 of each water inlet and water distribution structure 31 is two, the number of the water inlet and water supply structures 32 is two, and the two water inlet and water supply structures 32 are respectively connected to the two externally extending water inlet parts 312 of each water inlet and water distribution structure 31; the number of the externally extending water outlet parts 412 of each water drainage and water distribution structure 41 is two, the number of the water drainage collection structures 42 is two, and the two water drainage collection structures 42 are respectively connected to the two externally extending water outlet parts 412 of each water inlet and water distribution structure 31. Through the two water inlet and water supply structures 32, the cooling water is simultaneously transported from the two externally extending water inlet parts 312 to the internally extending water distribution parts 311 in the heat exchange smoke pipe 1, and then respectively to the multiple convection heat exchange tubes 21 for convection heat exchange with the flue gas. The water that absorbs heat in the multiple convection heat exchange tubes 21 is simultaneously transported to the two externally extending water outlet parts 412 through the internally extending water parts 411, and then flows into the two water drainage collection structures 42, which is beneficial to improve the heat exchange efficiency of the convection heat exchange mechanism 2. Specifically, the two water inlet and supply structures 32 are symmetrically distributed on both sides of the heat exchange smoke tube 1 . The two drainage and collection structures 42 are symmetrically distributed on both sides of the heat exchange smoke tube 1 .

[0051] In the embodiment of the present invention, Figure 5 As shown, the radiation heat exchange structure includes a plurality of radiation heat exchange tubes 13, and the plurality of radiation heat exchange tubes 13 are arranged along the circumference of the heat exchange smoke tube 1. The radiation heat of the flue gas in the heat exchange smoke tube 1 is absorbed by the plurality of radiation heat exchange tubes 13, thereby further improving the heat exchange efficiency of the converter vaporization flue device 100 with composite enhanced heat exchange and the recovery rate of heat in the flue gas. Specifically, the plurality of radiation heat exchange tubes 13 are laid on the outer wall surface of the heat exchange smoke tube 1. Optionally, the plurality of radiation heat exchange tubes 13 are embedded in the tube wall of the heat exchange smoke tube 1. Optionally, the plurality of radiation heat exchange tubes 13 enclose the heat exchange smoke tube 1.

[0052] Implementation Method 2

[0053] The present invention also provides a converter waste heat recovery system, including the above-mentioned converter vaporization flue device 100 with composite enhanced heat exchange. The structure, working principle and beneficial effects of the converter vaporization flue device 100 with composite enhanced heat exchange are the same as those described in the first embodiment, and will not be repeated here. Figure 7 As shown, the converter waste heat recovery system includes a smoke exhaust pipe 200 , and a converter vaporization flue device 100 with composite enhanced heat exchange is installed in a medium temperature section 202 of the smoke exhaust pipe 200 .

[0054] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A converter gasification flue device with composite enhanced heat exchange, characterized in that: include: A heat exchange smoke pipe having a smoke inlet end and a smoke outlet end; The convection heat exchange mechanism comprises a plurality of convection heat exchange tubes, a water inlet structure and a drainage structure, wherein the plurality of convection heat exchange tubes are arranged at intervals in the heat exchange smoke tube, and the two ends of the convection heat exchange tubes are respectively connected to the water inlet structure and the drainage structure, and the water inlet structure is arranged close to the smoke outlet end, and the drainage structure is arranged close to the smoke inlet end; A radiation heat exchange structure is arranged on the tube wall of the heat exchange smoke tube; Wherein, at least one heat exchange fin is provided on the outer wall surface of the convection heat exchange tube along its axial direction, and the arrangement direction of the heat exchange fin is perpendicular to the line connecting the center of the convection heat exchange tube and the center of the heat exchange smoke tube; Both ends of the convection heat exchange tube are provided with bending tubes, the bending tubes are bent toward the center of the heat exchange smoke tube, and the two ends of the convection heat exchange tube are respectively connected with the water inlet structure and the drainage structure through the bending tubes.

2. The converter vaporization flue device with composite enhanced heat exchange according to claim 1 is characterized in that: The convection heat exchange tube is arranged along the axial direction of the heat exchange smoke tube, and the water flow direction in the convection heat exchange tube is opposite to the smoke flow direction in the heat exchange smoke tube.

3. The converter gasification flue device with composite enhanced heat exchange according to claim 1 is characterized in that: The temperature of the flue gas entering from the flue gas inlet end is 650°C to 900°C.

4. The converter vaporization flue device with composite enhanced heat exchange according to claim 1 is characterized in that: The angle between the axis of the bent tube and the axis of the convection heat exchange tube is 30 degrees to 90 degrees.

5. The converter vaporization flue device with composite enhanced heat exchange according to claim 4 is characterized in that: A plurality of convection heat exchange layers are arranged in the heat exchange smoke tube at intervals along the radial direction thereof, and the convection heat exchange layer includes a plurality of the convection heat exchange tubes.

6. The converter vaporization flue device with composite enhanced heat exchange according to claim 5, characterized in that: The water inlet structure includes a plurality of water inlet distribution structures, which are arranged at intervals along the radial direction of the heat exchange smoke tube, and the inner extending water distribution portion of each of the water inlet distribution structures is connected to at least one of the convection heat exchange layers; the drainage structure includes a plurality of drainage distribution structures, which are arranged at intervals along the radial direction of the heat exchange smoke tube, and the inner extending water portion of each of the drainage distribution structures is connected to at least one of the convection heat exchange layers.

7. The converter vaporization flue device with composite enhanced heat exchange according to claim 6 is characterized in that: The water inlet structure also includes a water inlet supply structure, which is installed outside the heat exchange smoke pipe, and the water inlet distribution structure has an externally extending water inlet portion located outside the heat exchange smoke pipe, and the water inlet supply structure is connected with the internally extending water distribution portion through the externally extending water inlet portion; the drainage structure also includes a drainage collecting structure, which is installed outside the heat exchange smoke pipe, and the drainage distribution structure has an externally extending water outlet portion located outside the heat exchange smoke pipe, and the drainage collecting structure is connected with the internally extending water outlet portion through the externally extending water outlet portion.

8. The converter gasification flue device with composite enhanced heat exchange according to claim 1 is characterized in that: The radiation heat exchange structure includes a plurality of radiation heat exchange tubes, and the plurality of radiation heat exchange tubes are arranged along the circumference of the heat exchange smoke tube.

9. A converter waste heat recovery system, characterized in that: A converter vaporization flue device comprising the composite enhanced heat exchange as described in any one of claims 1-8.

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