Heat pipe-based zero-energy-consumption white smoke removal method and device for primary flue gas diffusion chimney of converter

Abstract

The invention discloses a heat pipe-based zero-energy-consumption white smoke removal method and device for a primary flue gas diffusion chimney of a converter. The white smoke removal device comprises a converter primary flue gas diffusion chimney, a flue gas inlet pipeline, a water baffle, a segmented drainage system, a folded plate demister, a throat spiral fin cooler, a swirler, a water collector, an upper spiral fin cooler, an ignition device, a chimney sealing plate and a gravity assisted heat pipe heat exchanger, flue gas is sequentially subjected to pre-dehydration, heat pipe heat exchange cooling, primary white smoke removal, intensified cooling, sufficient cooling, secondary white smoke removal and heat pipe heat exchange reheating and then is discharged into the atmosphere, water vapor in the flue gas is sufficiently condensed and removed in a segmented mode, the absolute humidity and the relative humidity of the flue gas are effectively reduced, white smoke plume and various pollutants at an outlet of a diffusion chimney can be efficiently reduced, and the emission efficiency of the flue gas is improved. And meanwhile, consumption of external energy is not increased in the whole process, the white smoke removal effect is good, the cost performance is high, and the method is suitable for newly-built and reformed projects and particularly suitable for the situation that the requirement for the white smoke removal effect of the chimney is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of primary flue gas dry purification and recovery in steel enterprises, and particularly relates to a white smoke removal method and device based on heat pipe zero energy consumption for a primary flue gas dispersing chimney of a converter. BACKGROUND

[0002] In order to make the primary flue gas of the converter meet the ultra-low emission requirement, the scheme of prepositioning a coal gas cooler in the dry dedusting technology is currently used. The primary flue gas of the converter purified by an electrostatic precipitator is washed by water spraying in the coal gas cooler, so that the dust concentration is further reduced, and then, under the control of a cup valve switching station, the flue gas that cannot be recovered will enter the dispersing chimney and then be discharged into the atmosphere. However, since the flue gas entrains a large amount of liquid droplets into the dispersing chimney after passing through the coal gas cooler, and new liquid droplets are formed when the flue gas meets the atmosphere during dispersing, a large amount of "white smoke" is formed around the chimney, which not only affects the surrounding environment, but also causes waste of water resources. Therefore, the dispersing flue gas needs to be treated to remove the white smoke at the outlet of the chimney.

[0003] Currently, the following three methods are commonly used in various industries to remove white smoke from flue gas:

[0004] (1) flue gas condensation white smoke removal;

[0005] (2) flue gas reheating white smoke removal;

[0006] (3) flue gas electric charging white smoke removal.

[0007] These methods all have the effect of reducing the outlet white smoke plume, but methods (2) and (3) consume heat and electricity, respectively, and method (1) commonly uses cold water as the heat exchange medium, which also requires energy consumption. The chimney height of the primary flue gas of the converter is usually more than 60 m, which also leads to high energy consumption and cost of applying these methods to the dispersing chimney of the primary flue gas of the converter. A method and device for removing white smoke from the primary flue gas of the converter with low energy consumption and low cost still need to be explored. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a white smoke removal method and device based on heat pipe zero energy consumption for a primary flue gas dispersing chimney of a converter, which can effectively reduce the absolute humidity and relative humidity of the flue gas without consuming energy alone, thereby reducing the white smoke plume at the outlet of the dispersing chimney under the premise that the primary flue gas of the converter meets the ultra-low emission requirement.

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

[0010] The application provides a white smoke removing device based on heat pipe zero energy consumption for a converter primary flue gas emission chimney, which comprises a converter primary flue gas emission chimney, a flue gas inlet pipeline, a water baffle, a sectional drainage system, a folded plate demister, a throat spiral fin cooler, a cyclone, a water collector, an upper spiral fin cooler, an ignition device, a chimney sealing plate and a gravity heat pipe heat exchanger.

[0011] The water baffle is arranged on the inner wall of the flue gas inlet pipeline, and the folded plate demister is arranged in the chimney lower straight pipe section higher than the evaporator of the gravity heat pipe heat exchanger.

[0012] The gravity heat pipe heat exchanger comprises an evaporator, a condenser, a steam rising pipe and a liquid falling pipe, the evaporator is internally provided with a phase change medium, the evaporator is arranged in the chimney lower straight pipe section higher than the flue gas inlet pipeline, the condenser is arranged in the chimney upper straight pipe section below the ignition device, and the heat-insulated steam rising pipe and the heat-insulated liquid falling pipe are both located outside the chimney and connected with the evaporator and the condenser.

[0013] The cyclone comprises a fixed plate and cyclone blades mounted on the fixed plate, the diameter of the fixed plate is smaller than the diameter of the chimney at the position where the fixed plate is arranged, one end of the cyclone blade is connected with the fixed plate, and the other end of the cyclone blade is connected with the inner wall of the chimney; the cyclone is arranged at the position where the chimney upper straight pipe section starts, and the flue gas rises from the gap between the cyclone blades from bottom to top to generate cyclone flow.

[0014] The water collector comprises a porous annular wall and an annular sealing plate connected with the bottom edge of the porous annular wall, the porous annular wall is uniformly provided with holes, the center hole of the annular sealing plate is communicated with the center hole of the porous annular wall, and the annular sealing plate is connected with the inner wall of the chimney to close the gap between the bottom end of the porous annular wall and the inner wall of the chimney; the water collector is arranged between the cyclone and the condenser of the gravity heat pipe heat exchanger.

[0015] The chimney sealing plate is obliquely arranged in the inner part of the lower end of the chimney, and the lowest point of the chimney sealing plate is lower than the flue gas inlet pipeline; the flue gas inlet pipeline is communicated with the lower part of the chimney.

[0016] The sectional drainage system comprises a first drainage port, a second drainage port, a third drainage port, a plurality of drainage pipes and a gas drainage device, the first drainage port is located at the bottom of the flue gas inlet pipeline, the second drainage port is arranged on the chimney at a position corresponding to the lowest point of the chimney sealing plate, and the third drainage port is arranged on the chimney at a position corresponding to the lowest point of the annular sealing plate of the water collector; the first drainage port, the second drainage port and the third drainage port are all communicated with the gas drainage device through the drainage pipes.

[0017] Preferably, the throat spiral fin cooler comprises fins spirally arranged on the outer wall of the throat of the chimney.

[0018] Preferably, the upper spiral fin cooler comprises fins spirally arranged on the outer wall of the upper straight cylinder of the chimney.

[0019] Preferably, the water baffle has two, the water baffle is semicircular ring, two water baffle front and back staggered in the flue gas inlet pipe inner wall, one of the water baffle is welded in the lower part of the flue gas inlet pipe inner wall, the other water baffle is welded in the upper part of the flue gas inlet pipe inner wall.

[0020] Preferably, the baffle demister includes two groups of support beams arranged in parallel up and down and a plurality of zigzag plates installed between the two groups of support beams, and the two ends of the support beams are connected to the chimney inner wall.

[0021] The application also provides a de-whitening method of the converter primary flue gas diffusion chimney based on heat pipe zero-energy consumption de-whitening device, comprising the following steps:

[0022] (1) pre-dewatering: after the flue gas enters the converter primary flue gas diffusion chimney based on heat pipe zero-energy consumption de-whitening device, the liquid droplets on the flue gas inlet pipe wall and part of the liquid droplets in the flue gas are intercepted by the water baffle, finally collected at the bottom of the flue gas inlet pipe, and then discharged through the first drain at the bottom of the flue gas inlet pipe, realizing pre-dewatering and reducing the liquid droplets in the flue gas;

[0023] (2) heat pipe heat exchange cooling: after the flue gas is pre-dewatered, it enters the evaporator of the gravity heat pipe heat exchanger, the phase change medium in the evaporator evaporates under high temperature, absorbs the heat of the flue gas, and makes the water vapor in the flue gas condense and precipitate, so that the absolute humidity of the flue gas is effectively reduced;

[0024] (3) primary de-whitening: after the flue gas is cooled by the evaporator of the gravity heat pipe heat exchanger, it enters the baffle demister, when the flue gas with liquid droplets passes through the baffle demister, the flow line of the flue gas is deflected, so that the liquid droplets are intercepted by the baffle, the larger liquid droplets can be effectively separated from the flue gas, the intercepted liquid droplets flow down along the zigzag plate and collect at the chimney sealing plate, then discharged through the second drain, realizing primary de-whitening;

[0025] (4) enhanced cooling: after the flue gas is primary de-whitened, it enters the throat part of the chimney through the narrowing section of the chimney, and the spiral fins of the throat spiral fin cooler surrounding the outer wall of the throat part can enhance the heat exchange between the flue gas and the outside, which helps to reduce the temperature of the flue gas and accelerate the condensation of water vapor in the flue gas;

[0026] (5) Full cooling: After the flue gas is strengthened by the throat spiral fin cooler, it passes through the chimney diffusion section, and then enters the cyclone, and the flue gas generates cyclone, and then enters the upper spiral fin cooler, the cyclone makes the turbulence of the airflow more intense and fully contacts the chimney wall, which can effectively enhance the heat exchange between the flue gas and the chimney wall, and the spiral fin of the upper spiral fin cooler around the outer wall of the chimney can effectively enhance the heat exchange between the chimney wall and the outside, under the action of the cyclone-fin coupled strengthened heat exchange, the flue gas is fully cooled, and the water vapor in the flue gas is fully condensed;

[0027] (6) Secondary white removal: After the flue gas is fully cooled by the upper spiral fin cooler, the water vapor in the flue gas is fully condensed and separated, and the water mist enters the water collector under the action of the cyclone, and the water vapor attached to the porous cylindrical wall or the inner wall of the chimney is finally collected at the sealing plate of the water collector and then discharged through the third drainage port, so that secondary white removal is realized.

[0028] (7) Heat pipe heat exchange reheating: After the flue gas is subjected to secondary white removal, it enters the condenser of the gravity heat pipe heat exchanger, the phase change medium in the condenser is condensed at low temperature, and heat is released to the outlet flue gas, so that the temperature of the outlet flue gas is increased, and the state of the outlet flue gas is far away from the saturated moisture content, and the relative humidity of the flue gas is effectively reduced.

[0029] The converter primary flue gas diffusion chimney based on the white removal device of the heat pipe zero energy consumption has the following beneficial effects:

[0030] 1) Through the pre-dehydration by the water baffle, the heat exchange and cooling by the evaporator of the gravity heat pipe heat exchanger, the primary white removal by the folded plate demister, the strengthened cooling by the throat spiral fin cooler, the full cooling by the cyclone and the upper spiral fin, the secondary white removal by the water collector and the reheating by the condenser of the gravity heat pipe heat exchanger, the water vapor in the flue gas is fully condensed and removed, the absolute humidity and the relative humidity of the flue gas are effectively reduced, and the white smoke plume at the outlet of the diffusion chimney is effectively reduced, which has good social benefits.

[0031] 2) The flue gas condensation and reheating are realized by the gravity heat pipe heat exchanger at the lower part and the upper part of the chimney, and the cooling is realized by the natural heat dissipation along the chimney, and the white removal is realized by the kinetic energy of the flue gas, and the whole process does not increase the consumption of external energy, which meets the requirements of energy saving and emission reduction.

[0032] 3) The condensed water is collected through the drainage pipes after being discharged through the coal gas drain after being collected from the drainage ports, so that the path of the condensed water along the wall is shortened, and the risk of the condensed water being wrapped by the airflow is reduced, and after being collected, the condensed water can be discharged in time, smoothly and safely, so that the white removal effect is ensured.

[0033] 4) By adopting a thorough condensation and dehydration method, not only can the water content in the flue gas be reduced, but also particulate matter and gaseous pollutants in the flue gas can be removed, further reducing the emission concentration of particulate matter and gaseous pollutants in the flue gas, which helps to achieve ultra-low emissions.

[0034] 5) This device has no operating energy consumption, has a good whitening effect, and has a high cost performance. It is suitable for new construction and renovation projects, especially for situations where the whitening effect of chimneys is required to be high. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the desulfurization device based on heat pipe zero energy consumption for the converter primary flue gas venting chimney in an embodiment of the present invention;

[0036] Figure 2 This is a side view of the water collector according to an embodiment of the present invention;

[0037] Figure 3 This is a top view of the hydrocyclone according to an embodiment of the present invention;

[0038] Figure 4 This is a side view of the folding plate demister according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the water baffle plate according to an embodiment of the present invention. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] like Figures 1 to 5 As shown, this embodiment discloses a converter primary flue gas venting chimney with zero energy consumption based on heat pipes for desulfurization. It is connected to the outlet pipe of the cup valve switching station in the converter dry dust removal system. Flue gas that cannot be recovered is discharged into the atmosphere through this device.

[0042] Specifically, the converter primary flue gas venting chimney based on heat pipe zero-energy whitening device includes a converter primary flue gas venting chimney 1, flue gas inlet pipe 2, baffle plate 3, segmented drainage system 4 (referred to as drainage system), baffle plate demister 5, throat spiral finned cooler 6, cyclone separator 7, water collector 8, upper spiral finned cooler 9, ignition device 10, chimney sealing plate 11, and gravity heat pipe heat exchanger 12.

[0043] The converter's primary flue gas venting chimney 1, ignition device 10, and flue gas inlet pipe 2 are all conventional designs. For example... Figure 1 The converter primary flue gas venting chimney has a throat 101, a diffuser section 102, a narrowing section 103, a lower straight pipe section 104, and an upper straight pipe section 105.

[0044] The water baffle 3 is made of angle steel or flat steel and has a semicircular ring shape, and two water baffles 3 are welded on the inner wall of the flue gas inlet pipe 2 at an angle of 180°. The two water baffles 3 are staggered and arranged on the inner wall of the flue gas inlet pipe 2. One of the water baffles 3 is welded on the lower part of the inner wall of the flue gas inlet pipe 2 (close to the flue gas inlet), which prevents the condensate water in the chimney 1 from flowing back to the flue gas inlet pipe 2 along the pipe wall. The other water baffle 3 is welded on the upper part of the inner wall of the flue gas inlet pipe 2 (arranged at the rear, closer to the chimney 1), which intercepts the liquid droplets on the pipe wall and part of the liquid droplets in the flue gas, so as to prevent them from entering the diffusion chimney 1. The intercepted condensate water is discharged through the drainage system 4.

[0045] The gravity heat pipe heat exchanger 12 includes an evaporator 121, a condenser 122, a steam riser 123, and a liquid downcomer 124. The evaporator 121 is internally provided with a phase change medium, and is arranged in the lower straight pipe section 104 of the chimney 1 above the flue gas inlet pipe 2. The condenser 122 is arranged in the upper straight pipe section 105 of the chimney 1 below the ignition device 10. The heat-insulated steam riser 123 and the heat-insulated liquid downcomer 124 are both located outside the chimney 1 and are connected to the evaporator 121 and the condenser 122. The evaporator 121 of the gravity heat pipe heat exchanger 12 absorbs the heat of the inlet flue gas. The water vapor in the flue gas condenses and precipitates, so that the water content of the flue gas is reduced. The steam generated by the boiling of the phase change medium in the evaporator 121 flows to the upper condenser 122 through the steam riser 123 and condenses, releasing heat to the outlet flue gas. The temperature of the flue gas is increased, so that the relative humidity is reduced. At the same time, the condensed liquid flows back to the evaporator 121 through the liquid downcomer 124. Without external power, the heat is automatically circulated and transmitted by the continuous phase change of the internal medium, so as to realize the condensation of the inlet flue gas and the reheating of the outlet flue gas, effectively reduce the absolute humidity and the relative humidity of the flue gas.

[0046] The baffle demister 5 includes two groups of support beams 52 arranged in parallel and a zigzag plate 51 arranged between the two groups of support beams 52. The two ends of the support beam 52 are connected to the inner wall of the chimney 1. The baffle demister 5 is arranged in the lower straight pipe section 104 of the chimney 1 above the evaporator 121 of the gravity heat pipe heat exchanger 12. The angle, thickness, and spacing of the zigzag plate 51 of the baffle demister 5 are designed according to the working conditions. The liquid droplets in the flue gas can be intercepted by the zigzag plate 51 and then flow downward along the zigzag plate 51 and gather at the chimney sealing plate 11, and then be discharged through the drainage system 4.

[0047] The chimney sealing plate 11 is installed in the lower straight pipe section 104 of the chimney 1 at an angle, and the lowest point is lower than the flue gas inlet pipe 2, so as to avoid water accumulation at the bottom of the chimney 1. The liquid droplets in the flue gas input by the flue gas inlet pipe 2 can be intercepted by the zigzag plate 51 and then flow downward along the zigzag plate 51 and gather at the chimney sealing plate 11.

[0048] The throat spiral fin cooler 6 comprises spiral fins spirally arranged on the outer wall of the chimney throat 101; the fins of the throat spiral fin cooler 6 are spirally arranged on the outer wall of the chimney throat 101, which strengthens the heat exchange of the flue gas in the chimney throat 101 and accelerates the condensation of water vapor in the flue gas.

[0049] The cyclone 7 comprises a fixed plate 72 and cyclone vanes 71 installed on the fixed plate 72, the diameter of the fixed plate 72 is smaller than the diameter of the chimney 1 at the position where the fixed plate 72 is located, one end of the cyclone vanes 71 is connected with the fixed plate 72, and the other end of the cyclone vanes 71 is connected with the inner wall of the chimney 1; the cyclone 7 is arranged at the position where the upper straight pipe section 105 of the chimney starts, and the flue gas rises from the gap between the cyclone vanes 71 to generate cyclone. The size, number and spatial angle of the cyclone vanes 71 of the cyclone 7 are designed according to the working condition, and the flue gas generates cyclone after passing through the cyclone, so as to further contact with the inner wall of the chimney 1 for cooling, and at the same time, the water mist in the flue gas is thrown into the water collector 8 (that is, between the porous annular wall surface 81 and the inner wall of the chimney 1).

[0050] The water collector 8 comprises a porous annular wall surface 81 and an annular sealing plate 83 connected to the bottom edge of the porous annular wall surface 81, the porous annular wall surface 81 is uniformly provided with holes 82, the center hole of the annular sealing plate 83 is in communication with the center hole of the porous annular wall surface 81, and the annular sealing plate 83 is connected with the inner wall of the chimney 1 to close the gap between the bottom end of the porous annular wall surface 81 and the inner wall of the chimney 1. The size and spacing of the holes 82 on the porous annular wall surface 81 of the water collector 8 are designed according to the working condition, the water collector 8 is arranged between the cyclone 7 and the condenser 122 of the gravity heat pipe heat exchanger 12, the water mist enters the inside of the water collector 8 through the porous annular wall surface 81 under the action of cyclone, adheres to the porous annular wall surface 81 or the inner wall of the chimney 1, and then collects at the third drainage port 43 at the bottom of the water collector 8, and finally is discharged through the drainage system 4.

[0051] The upper spiral fin cooler 9 comprises spiral fins spirally arranged on the outer wall of the upper straight pipe section 105 of the chimney. The fins of the upper spiral fin cooler 9 are spirally arranged on the outer wall of the upper straight pipe section 105 of the chimney 1, which strengthens the heat exchange of the flue gas in the cyclone section and accelerates the condensation of water vapor in the flue gas.

[0052] The segmented drainage system 4 comprises a first drainage port 41, a second drainage port 42, a third drainage port 43, a plurality of drainage pipes 44 and a gas water drainer 45, the first drainage port 41 is located at the bottom of the flue gas inlet pipe 2 (between the two water baffles 3), the second drainage port 42 is arranged on the chimney 1 at a position corresponding to the lowest point of the chimney sealing plate 11, and the third drainage port 43 is arranged on the chimney 1 at a position corresponding to the lowest point of the annular sealing plate 83 of the water collector 8; the first drainage port 41, the second drainage port 42 and the third drainage port 43 are all connected to the gas water drainer 45 through the drainage pipes 44, and the condensed water separated from the flue gas is drained in segments, and the condensed water is collected into the gas water drainer 45 through the drainage pipes 44 and then drained.

[0053] The embodiment also provides a white smoke removal method of the converter primary flue gas emission chimney based on heat pipe zero-energy consumption white smoke removal device, when the converter primary flue gas needs to be emitted, the flue gas enters the converter primary flue gas emission chimney based on heat pipe zero-energy consumption white smoke removal device through the cup valve switching station, and is discharged into the atmosphere after pre-dehydration, heat pipe heat exchange cooling, primary white smoke removal, intensified cooling, sufficient cooling, secondary white smoke removal and heat pipe heat exchange reheating, and the method specifically comprises the following steps:

[0054] 1) pre-dehydration: after the flue gas enters the converter primary flue gas emission chimney based on heat pipe zero-energy consumption white smoke removal device, the flue gas first passes through the flue gas inlet pipe 2, the liquid droplets on the wall surface of the flue gas inlet pipe 2 and part of the liquid droplets in the flue gas are intercepted by the water baffles 3, finally collected at the bottom of the flue gas inlet pipe 2, and then drained through the first drainage port 41 at the bottom of the flue gas inlet pipe 2, realizing pre-dehydration and reducing the liquid droplets in the flue gas;

[0055] 2) heat pipe heat exchange cooling: after the flue gas is pre-dehydrated, the flue gas enters the evaporator 121 of the gravity heat pipe heat exchanger 12, the phase change medium in the evaporator 121 evaporates under high temperature, absorbs the heat of the flue gas, and makes the water vapor in the flue gas condense and separate out, so that the absolute humidity of the flue gas is effectively reduced;

[0056] 3) primary white smoke removal: after the flue gas is cooled by the evaporator 121 of the gravity heat pipe heat exchanger 12, the flue gas enters the baffle demister 5, when the flue gas with liquid droplets passes through the baffle demister 5, the flue gas flow line is deflected so that the liquid droplets are intercepted by the baffle, the liquid droplets with larger particles can be effectively separated from the flue gas, the intercepted liquid droplets flow downward along the zigzag baffle 51 and are collected at the chimney sealing plate 11, and then drained through the second drainage port 42, realizing primary white smoke removal and significantly reducing the liquid droplets in the flue gas;

[0057] 4) intensified cooling: after the flue gas is once de-whitened by the baffle demister 5, the flue gas enters the chimney throat 101 through the chimney narrowing section 103, and the spiral fins (throat spiral fin cooler 6) around the outer wall of the chimney throat can effectively intensify the heat exchange between the flue gas in the chimney throat and the outside, which helps to reduce the temperature of the flue gas and accelerate the condensation of the water vapor in the flue gas;

[0058] 5) Full cooling: After the flue gas is strengthened by the throat spiral fin cooler 6, it passes through the diffusion section 102 of the chimney 1, and then enters the cyclone 7. The flue gas generates cyclone, and then enters the upper spiral fin cooler 9. The cyclone makes the turbulence of the airflow more intense, and can fully contact the wall of the chimney 1. The heat exchange between the flue gas and the wall of the chimney 1 can be effectively enhanced. The spiral fin (upper spiral fin cooler 9) around the outer wall of the chimney 1 can effectively enhance the heat exchange between the wall of the chimney 1 and the outside. Under the action of the cyclone-fin coupled enhanced heat exchange, the flue gas is fully cooled, and the water vapor in the flue gas is fully condensed;

[0059] 6) Secondary white smoke removal: After the flue gas is fully cooled by the upper spiral fin cooler 9, the water vapor in the flue gas is fully condensed and separated. The water mist in the central hole of the porous annular wall 81 passes through the porous annular wall 81 and enters the water collector 8 under the action of the cyclone. In the water collector 8, the flue gas and the condensed water are separated efficiently. Due to the centrifugal force, the water vapor entering the water collector 8 is difficult to escape from the water collector 8 through the porous annular wall 81. Finally, it will be attached to the porous annular wall 81 of the water collector 8 or the inner wall of the chimney 1, and will flow down with the water condensed directly on the porous annular wall 81 or the inner wall of the chimney 1 and the flue gas entering the inside of the water collector 8 (i.e. between the porous annular wall 81 and the inner wall of the chimney 1). Finally, it will be collected at the annular sealing plate 83 of the water collector 8, and then discharged through the third drainage port 43 at the low place, realizing secondary white smoke removal, and effectively reducing the absolute humidity of the flue gas again;

[0060] 7) Heat pipe heat exchange reheating: After the secondary white smoke removal, the flue gas enters the condenser 122 of the gravity heat pipe heat exchanger 12. The phase change medium in the condenser 122 is condensed at low temperature, and releases heat to the outlet flue gas. The temperature of the outlet flue gas is increased, and its state is far from the saturated moisture content. After the relative humidity of the flue gas is effectively reduced, it is discharged into the atmosphere, and the white smoke plume at the outlet of the chimney 1 is prevented again.

[0061] By using the above white smoke removal device and method, the converter primary flue gas is treated by zero energy consumption, low cost and high efficiency. The problem of a large amount of "white mist" formed around the converter primary flue gas diffusion chimney 1 is solved, and the following advantages and

[0062] Advantages:

[0063] 1) By the methods of pre-dehydration, heat pipe heat exchange cooling, primary white smoke removal, strengthening cooling, full cooling, secondary white smoke removal and heat pipe heat exchange reheating, the water vapor in the flue gas is fully condensed and removed, the absolute humidity and relative humidity of the flue gas are effectively reduced, and the white smoke plume at the outlet of the diffusion chimney 1 is effectively reduced, which has good social benefits.

[0064] 2) The flue gas is condensed and reheated by gravity heat pipe heat exchangers 12 at the lower and upper parts of the chimney 1. At the same time, the flue gas is cooled by natural heat dissipation along the chimney 1 and de-whitened by the kinetic energy of the flue gas itself. The whole process does not increase the consumption of external energy and meets the requirements of energy conservation and emission reduction.

[0065] 3) A segmented drainage method is adopted. A first drain outlet 41 is installed at the pre-dehydration stage; a chimney sealing plate 11 and a second drain outlet 42 are installed at the primary bleaching stage; and a water collector 8 and a third drain outlet 43 are installed at the secondary bleaching stage. Condensate is collected from each drain outlet via drain pipe 44 and then discharged through a gas drainer 45. This shortens the path of condensate flowing downwards along the wall and reduces the risk of condensate being re-entrained by airflow. After collection, the condensate can be discharged promptly, smoothly, and safely, ensuring the bleaching effect. Furthermore, the condensate can be recycled and reused, avoiding water waste.

[0066] 4) By adopting a thorough condensation and dehydration method, not only can the water content in the flue gas be reduced, but also particulate matter and gaseous pollutants in the flue gas can be removed, further reducing the emission concentration of particulate matter and gaseous pollutants in the flue gas, which helps to achieve ultra-low emissions.

[0067] 5) The spiral fins surrounding the outer wall of the chimney 1 used in the throat spiral fin cooler 6 and the upper spiral fin cooler 9 also have the function of reinforcing the chimney 1, which helps to enhance the strength of the chimney 1.

[0068] 6) Two baffles 3 are used to achieve a two-way water blocking effect. They not only intercept the droplets on the flue gas duct wall and some droplets in the flue gas to prevent them from entering the chimney 1, but also intercept the condensate formed in the chimney 1 to prevent it from flowing back to the flue gas duct along the pipe wall.

[0069] 7) This device has no operating energy consumption, good whitening effect, and high cost performance. It is suitable for new construction and renovation projects, especially for situations where the whitening effect of chimney 1 is required to be high.

[0070] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. A white smoke removal device based on heat pipe zero energy consumption for converter primary flue gas emission chimney, characterized in that, The converter primary flue gas emission chimney, the flue gas inlet pipeline, the water baffle, the sectional drainage system, the baffle demister, the throat helical fin cooler, the cyclone, the water collector, the upper helical fin cooler, the ignition device, the chimney sealing plate and the gravity heat pipe heat exchanger are arranged in the converter primary flue gas emission chimney. The water baffles are arranged on the inner wall of the flue gas inlet pipeline. The gravity heat pipe heat exchanger comprises an evaporator, a condenser, a steam rising pipe and a liquid falling pipe. The cyclone comprises a fixed plate and helical flow vanes mounted on the fixed plate. The water collector comprises a porous annular wall and an annular sealing plate connected to the bottom edge of the porous annular wall. The sectional drainage system comprises a first drainage port, a second drainage port, a third drainage port, a plurality of drainage pipes and a gas drainage device. The throat helical fin cooler comprises helical fins spirally arranged on the outer wall of the throat of the chimney.

2. The once-through flue gas emission stack of the converter based on the heat pipe zero-energy consumption device for removing white smoke according to claim 1, characterized in that: The upper helical fin cooler comprises helical fins spirally arranged on the outer wall of the upper straight cylinder of the chimney.

3. The once-through flue gas emission stack of the converter based on the heat pipe zero-energy consumption device for removing white smoke according to claim 1, characterized in that: The water baffles are arranged on the inner wall of the flue gas inlet pipeline.

4. The once-through flue gas emission stack of the converter based on the heat pipe zero-energy consumption device for white smoke removal according to claim 1, characterized in that: The baffle demister comprises two groups of support beams arranged in parallel and a plurality of zigzag plates mounted between the two groups of support beams.

5. The once-through flue gas emission stack of the converter based on heat pipe zero energy consumption device for white smoke removal according to claim 1, characterized in that: The method comprises the following steps.

6. The method for de-whitening of the converter once flue gas emission stack based on heat pipe zero energy consumption de-whitening device according to any one of claims 1 to 5, characterized in that, ​ (1) Pre-dehydration: After the flue gas enters the converter once flue gas diffusion chimney based on heat pipe zero energy consumption white device, first through the flue gas inlet pipe, the liquid drops on the wall of flue gas inlet pipe and part of the liquid drops in the flue gas are intercepted by the water baffle, finally collected at the bottom of the flue gas inlet pipe, then discharged through the first drain at the bottom of the flue gas inlet pipe, realizing pre-dehydration and reducing the liquid drops in the flue gas; (2) Heat pipe heat exchange cooling: After the flue gas is pre-dehydrated, it enters the evaporator of the gravity heat pipe heat exchanger. The phase change medium in the evaporator evaporates when it meets high temperature, absorbs the heat of the flue gas, and makes the water vapor in the flue gas condense and separate out, effectively reducing the absolute humidity of the flue gas; (3) First white removal: After the flue gas is cooled by the evaporator of the gravity heat pipe heat exchanger, it enters the baffle demister. When the flue gas with liquid drops passes through the baffle demister, the flue gas flow line is deflected so that the liquid drops are intercepted by the baffle. The larger liquid drops can be effectively separated from the flue gas. The intercepted liquid drops flow down along the zigzag baffle and collect at the chimney sealing plate, then discharged through the second drain, realizing first white removal; (4) Intensified cooling: After the flue gas is cooled by the first white removal, it enters the throat of the chimney through the narrowing section of the chimney. The spiral fins of the throat spiral fin cooler surrounding the outer wall of the chimney throat can intensify the heat exchange between the flue gas and the outside, which helps to reduce the temperature of the flue gas and accelerate the condensation of water vapor in the flue gas; (5) Full cooling: After the flue gas is intensively cooled by the throat spiral fin cooler, it passes through the diffusion section of the chimney and then enters the cyclone. The flue gas produces cyclone and then enters the upper spiral fin cooler. The cyclone makes the turbulence of the airflow more intense and fully contacts the chimney wall, which can effectively enhance the heat exchange between the flue gas and the chimney wall. The spiral fins of the upper spiral fin cooler surrounding the outer wall of the chimney can effectively enhance the heat exchange between the chimney wall and the outside. Under the action of cyclone-fin coupled intensified heat exchange, the flue gas is fully cooled, and the water vapor in the flue gas is fully condensed; (6) Second white removal: After the flue gas is fully cooled by the upper spiral fin cooler, the water vapor in the flue gas is fully condensed and separated out. The water mist enters the water collector under the action of cyclone and is separated from the flue gas. The water vapor attached to the porous cylindrical wall or the inner wall of the chimney finally collects at the sealing plate of the water collector and is discharged through the third drain, realizing second white removal; (7) Heat pipe heat exchange reheating: After the flue gas is subjected to second white removal, it enters the condenser of the gravity heat pipe heat exchanger. The phase change medium in the condenser condenses when it meets low temperature, releases heat to the outlet flue gas, and increases the temperature of the outlet flue gas, making its state far from the state of saturated humidity, effectively reducing the relative humidity of the flue gas.

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