Converter flue gas dust removal and waste heat recovery device and method

Abstract

The present invention belongs to the technical field of flue gas waste heat recovery, and specifically relates to a converter flue gas dust removal and waste heat recovery device and method, wherein the converter flue gas dust removal and waste heat recovery device comprises a dust removal component and a waste heat recovery component, the waste heat recovery component comprises a flue gas treatment box, the flue gas treatment box comprises a box body, the middle area inside the box body is a heat exchange zone, and heat exchange tubes are transversely arranged in the heat exchange zone; the present invention introduces flue gas into evenly arranged heat exchange tubes so that the flue gas passes through the inside of the heat exchange tubes in narrow channels, thereby increasing the heat exchange area and improving the absorption efficiency of heat in the flue gas; and by arranging a dust removal tube, the flue gas can only pass through the dust removal tube and enter the heat exchange gap to contact the inner wall of the heat exchange tube, and the particulate dust in the flue gas is retained on the inner wall of the dust removal tube, so that during the contact heat exchange process between the flue gas and the dust removal tube, the particulate dust adhering to the inner wall of the heat exchange tube and continuously accumulating scaling is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas waste heat recovery, and specifically relates to a converter flue gas dust removal and waste heat recovery device and method. Background Art

[0002] Due to the shortage of energy, as energy conservation work is further carried out. Various new and energy-saving advanced furnaces are becoming more and more perfect, and the use of high-quality insulation materials such as new refractory fibers has significantly reduced the heat loss of the furnace. The use of advanced combustion devices has strengthened combustion, reduced the amount of incomplete combustion, and the air-fuel ratio has also become reasonable. However, the technology of reducing exhaust heat loss and recovering flue gas waste heat is still not progressing fast. In order to further improve the thermal efficiency of the kiln and achieve the purpose of energy saving and consumption reduction, recovering flue gas waste heat is also an important way to save energy.

[0003] Flue gas is the main way for general energy-consuming equipment to waste energy. For example, boiler exhaust consumes about 15% of energy, while other equipment such as setting machines, dryers and kilns in the printing and dyeing industry mainly consume energy through flue gas emissions. Flue gas waste heat recovery mainly converts the heat carried by flue gas into usable heat through a certain heat exchange method.

[0004] The existing heat pipe waste heat recovery device is a special equipment for coal-fired, oil-fired and gas-fired boilers, which is installed at the smoke outlet. When working, it generally uses heat transfer tubes and other heat transfer elements with good heat transfer performance to make them contact with the flue gas and absorb the heat to heat water or air to achieve waste heat recovery; such technical means require the flue gas to contact with the heat transfer tube element, because the flue gas contains residual smoke impurities. During the contact process, the impurities in the flue gas are easy to adhere to the surface of the heat transfer element, resulting in scaling of the contact gap, affecting the heat transfer efficiency, and then reducing the waste heat recovery efficiency of the flue gas. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a converter flue gas dust removal and waste heat recovery device and method.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention proposes a converter flue gas dust removal and waste heat recovery device, including a dust removal component and a waste heat recovery component, the waste heat recovery component includes a flue gas treatment box, the flue gas treatment box includes a box body, and an air inlet and an air outlet are respectively arranged on both sides of the box body;

[0007] The middle area inside the box is a heat exchange area, and the areas inside the box located on both sides of the heat exchange area are respectively an air inlet area and an air outlet area, and the air inlet area, the heat exchange area and the air outlet area are separated by a partition; a heat exchange tube is transversely arranged in the heat exchange area, and the ends on both sides of the heat exchange tube are respectively connected with the air inlet area and the air outlet area; the side wall of the heat exchange tube is hollow to form a heat absorption cavity, and the ends on both sides of the heat absorption cavity are respectively connected with the upper water tank on the top of the box and the lower water tank at the bottom of the box through connecting pipes;

[0008] The dust removal assembly includes a dust removal pipe and a dust removal filter bag. The dust removal pipe is a metal mesh structure and is located in the middle position inside the heat exchange tube. Limiting rings are evenly arranged on the heat exchange gap between the outer surface of the dust removal pipe and the inner wall of the heat exchange tube. The limiting rings limit the dust removal pipe. The dust removal filter bag is located inside the air outlet area and is connected to the limiting ring close to the air outlet area.

[0009] Preferably, a dust removal plate is provided in the air outlet area, and a cleaning pipe is provided in the heat exchange gap. The cleaning pipe passes through each of the limiting rings in sequence, and the end of the cleaning pipe is communicated with the dust removal chamber provided inside the dust removal plate, the dust removal chamber is communicated with an external air supply device, and the cleaning pipe is communicated with the heat exchange gap.

[0010] Preferably, the limiting ring is in sliding contact with the inner wall of the heat exchange tube, and annular scrapers are provided on the two side surfaces of the limiting ring, and the ends of the scrapers are in contact with the inner wall of the heat exchange tube; the dust removal plate is connected to the telescopic device provided on the side wall of the air inlet area.

[0011] Preferably, the interior of the limiting ring is hollow to form a purification chamber, the purification chamber is communicated with a connecting hole provided on the cleaning tube, and an impact hole is provided on the end of the scraper block, and the impact hole is communicated with the purification chamber.

[0012] Preferably, a guide ring is provided at a position inside the dust removal pipe corresponding to the heat exchange gap, the guide ring is a conical structure, and the conical end of the middle part of the guide ring points towards the direction close to the air intake area; the guide ring is connected to the dust removal plate through a connecting rod provided in the middle part.

[0013] Preferably, the outer circular end portion of the guide ring is in sliding contact with the inner wall of the dust removal pipe, and the connecting rod is connected to the output end of the propulsion device inside the dust removal plate.

[0014] Preferably, the outer circular end portion of the guide ring extends horizontally to form a scouring portion, and the outer surface of the scouring portion is evenly provided with transverse guide grooves; the guide groove is a conical groove structure, and the small end of the guide groove is located close to the air outlet area.

[0015] Preferably, cleaning cone blocks are evenly arranged on the inner wall of the guide groove, and the width of the cleaning cone blocks is smaller than the width of the guide groove.

[0016] Preferably, a suction hole is provided in an area of ​​the inner wall of the guide groove located in the gap between the cleaning cone blocks, and the suction hole connects the gap area of ​​the cleaning cone blocks and the inner area of ​​the guide ring.

[0017] A converter flue gas dust removal and waste heat recovery method, the converter flue gas dust removal and waste heat recovery method uses the above-mentioned converter flue gas dust removal and waste heat recovery device, and the specific steps of the converter flue gas dust removal and waste heat recovery method are:

[0018] S1: The flue gas that has undergone preliminary purification is introduced into the air inlet area inside the flue gas treatment box through the air inlet, so that it flows into the heat exchange tubes in the heat exchange area and flows along the inside of the heat exchange tubes;

[0019] S2: Start the water pump device inside the connecting pipe connected to the upper water tank, so that the water stored in the upper water tank is introduced into the heat absorption chamber through the connecting pipe, then flows along the heat absorption chamber, and flows into the lower water tank from the connecting pipe connected to the heat absorption chamber, repeatedly absorbing the heat of the flue gas flowing inside the heat exchange tube;

[0020] S3: The temperature of the heated water is detected in the lower water tank. If the temperature does not reach the preset temperature, the water is introduced into the upper water tank through the pipeline again, and circulated and heated again until the preset temperature is reached. The heated water is then directed to the outside for use.

[0021] S4: After passing through the heat exchange tube, the flue gas needs to pass through the dust filter bag installed on the end of the heat exchange tube. In the process of penetrating the dust filter bag, the residual smoke in the flue gas is left on the surface of the dust filter bag. The flue gas at the outlet is tested and discharged normally if it meets the emission standards.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention discloses a converter flue gas dust removal and waste heat recovery device and method. The present invention introduces flue gas into evenly arranged heat exchange tubes, allowing the flue gas to pass through the inside of the heat exchange tubes in narrow passages, so that the flue gas is dispersed to form multiple concentrated flue gas flows and fully contact the inner wall of the heat exchange tube, effectively increasing the heat exchange area and improving the absorption efficiency of the heat in the flue gas.

[0024] By setting up the dust removal pipe, after the flue gas flows into the interior of the heat exchange tube, it can only pass through the dust removal pipe and enter the heat exchange gap to contact the inner wall of the heat exchange tube, so that the particulate dust in the flue gas is retained on the inner wall of the dust removal pipe, while the flue gas that flows into the heat exchange gap and directly contacts the inner wall of the heat exchange tube has been purified by the dust removal pipe; in this way, during the contact heat exchange process between the flue gas and the dust removal pipe, the particulate dust adhering to the inner wall of the heat exchange tube and continuously accumulating scaling is reduced, and the dust impurities on the inner wall of the heat exchange tube prevent heat transfer, thereby effectively improving the subsequent heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a three-dimensional diagram of the converter flue gas dust removal and waste heat recovery device of the present invention;

[0027] Figure 2 It is a schematic diagram of the internal structure of the converter flue gas dust removal and waste heat recovery device of the present invention;

[0028] Figure 3 is a cross-sectional view of a heat exchange tube in the present invention;

[0029] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0030] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle;

[0031] Figure 6 is a stereogram of the limiting ring in the present invention;

[0032] Figure 7 It is a schematic diagram of the coordination of the limit ring, the cleaning pipe and the dust filter bag in the present invention;

[0033] Figure 8 It is a flow chart of the flue gas dust removal and waste heat recovery method of the present invention.

[0034] In the figure: box body 1, air inlet 11, air outlet 12, heat exchange area 13, air inlet area 14, air outlet area 15, heat exchange tube 16, heat absorption chamber 161, connecting tube 162, upper water tank 17, lower water tank 18, dust removal pipe 2, limit ring 21, purification chamber 211, heat exchange gap 22, cleaning pipe 23, connecting hole 231, scraper block 24, impact hole 241, guide ring 25, connecting rod 251, propulsion device 252, flushing part 253, guide groove 254, cleaning cone block 255, suction hole 256, dust filter bag 3, dust removal plate 4, dust removal chamber 41. DETAILED DESCRIPTION

[0035] 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.

[0036] Embodiment 1:

[0037] In order to effectively solve the above problems, as shown in the accompanying drawings of the specification Figure 1-Figure 8 As shown, a converter flue gas dust removal and waste heat recovery device includes a dust removal component and a waste heat recovery component. The dust removal component includes an electrostatic dust removal device, etc., which fully purifies the dust in the flue gas generated by the converter, and then the flue gas is passed to the waste heat recovery component. After the waste heat recovery component is used to further recover the heat in the flue gas, the subsequent flue gas is tested, and it can be discharged normally after passing the test; the waste heat recovery component includes a flue gas treatment box, the flue gas treatment box includes a box body 1, and the box body 1 is respectively provided with an air inlet 11 and an air outlet 12 on both sides. The air inlet 11 is connected to the pipeline of the previous treatment process, and the flue gas to be discharged is sent to the flue gas treatment box for waste heat recovery;

[0038] The middle area inside the box body 1 is the heat exchange area 13, and the two side areas inside the box body 1 are respectively the air inlet area 14 and the air outlet area 15, and the air inlet area 14, the heat exchange area 13 and the air outlet area 15 are separated by a partition; a heat exchange tube 16 is horizontally arranged in the heat exchange area 13, and the two side ends of the heat exchange tube 16 are respectively communicated with the air inlet area 14 and the air outlet area 15; the side wall of the heat exchange tube 16 is hollow to form a heat absorption cavity 161, and the two side ends of the heat absorption cavity 161 are respectively communicated with the upper water tank 17 at the top of the box body 1 and the lower water tank 18 at the bottom of the box body 1 through a connecting pipe 162, and the upper water tank 17 and the lower water tank 18 are filled with water and are provided with a temperature sensor; the air inlet area 14, the heat exchange area 13 and the air outlet area 15 are also provided with a temperature and humidity sensor, a smoke concentration sensor and a gas flow sensor, and the detected data are reflected on the display interface outside the box body 1, so that the processing personnel can understand the internal situation of the box body 1 and make corresponding adjustments;

[0039] The dust removal assembly also includes a dust removal pipe 2 and a dust removal filter bag 3. The dust removal filter bag 3 here can use an existing high-temperature resistant metal filter bag. The dust removal pipe 2 is a tubular structure composed of a metal mesh and is located in the middle position inside the heat exchange tube 16. The heat exchange gap 22 between the outer surface of the dust removal pipe 2 and the inner wall of the heat exchange tube 16 is evenly provided with a limiting ring 21. The limiting ring 21 limits the dust removal pipe 2. The dust removal filter bag 3 is located inside the air outlet area 15 and is connected to the limiting ring 21 close to the air outlet area 15.

[0040] Specific work flow: A large amount of flue gas will be generated during the converter production process. These flue gases carry heat and various smoke pollutants. In order to reduce pollution to the environment, the flue gas is purified through multiple processes through various dust removal and purification equipment of the dust removal component. Before the final discharge, in order to reduce energy waste, the flue gas can be treated by waste heat recovery to collect the heat in the flue gas and achieve the purpose of energy saving and emission reduction;

[0041] Specifically, the purified flue gas is first introduced into the air inlet 11 into the air inlet area 14 inside the flue gas treatment box. After being intercepted by the partition, the flue gas can only flow into the heat exchange tube 16 of the heat exchange area 13, flow along the inside of the heat exchange tube 16, and then flow into the gas outlet area 15. Because the heat exchange tube 16 is made of metal material with good thermal conductivity, the heat of the flue gas can be transferred to the water in the internal heat absorption chamber 161 during the process of contacting the flue gas.

[0042] The upper water tank 17 is connected to one end of the heat absorption chamber 161 through the connecting pipe 162, so that the water stored in the upper water tank 17 is introduced into the heat absorption chamber 161 through the connecting pipe 162, and then flows along the heat absorption chamber 161, and flows into the lower water tank 18 from the connecting pipe 162 connected to the other end of the heat absorption chamber 161. In this process, the heat exchange tube 16 fully transfers the heat in the flue gas to the flowing water, so that the water temperature increases; the heated water can flow directly from the lower water tank 18 to the outside through the pipeline for use, or it can be introduced into the upper water tank 17 again, circulate and flow to be heated again, and then flow out for use after reaching a predetermined temperature, so that the heat in the flue gas can be fully recovered to achieve the purpose of energy saving and emission reduction;

[0043] Furthermore, compared with the prior art, the present application introduces the flue gas into the evenly arranged heat exchange tubes 16, so that the flue gas passes through the narrow channel of the heat exchange tube 16, and after the flue gas is dispersed, multiple concentrated flue gases flow in and fully contact the inner wall of the heat exchange tube 16, thereby effectively increasing the heat exchange area and improving the absorption efficiency of the heat in the flue gas; and by setting the dust removal tube 2, after the flue gas flows into the heat exchange tube 16, it can only pass through the dust removal tube 2 and enter the heat exchange gap 22 to contact the inner wall of the heat exchange tube 16, so that the particulate smoke in the flue gas The dust is left on the inner wall of the dust removal pipe 2, while the flue gas that flows into the heat exchange gap 22 and directly contacts the inner wall of the heat exchange pipe 16 has been purified by the dust removal pipe 2; thus, in the process of contact and heat exchange between the flue gas and the dust removal pipe 2, it is possible to reduce the adhesion of particulate dust to the inner wall of the heat exchange pipe 16 and the continuous accumulation of scale, and avoid the situation where the dust impurities on the inner wall of the heat exchange pipe 16 prevent heat transfer, effectively improving the subsequent heat exchange efficiency, and thus reducing the frequency of manual cleaning and impurity removal of the heat exchange pipe 16, ensuring the smooth progress of the heat exchange operation;

[0044] Furthermore, because the dust removal pipe 2 adopts a metal mesh structure, the thermal conductivity is good, and the inner and outer surfaces of the dust removal pipe 2 are wrapped by the flue gas, the contact surface is large, so the heat in the flue gas is fully absorbed and transferred to the contacting heat exchange pipe 16 through the limiting ring 21, and then absorbed by the water flowing inside, further improving the recovery efficiency of the waste heat in the flue gas;

[0045] After passing through the heat exchange tube 16, the flue gas needs to pass through the dust filter bag 3 arranged on the end of the heat exchange tube 16. In the process of penetrating the dust filter bag 3, the residual smoke in the flue gas is retained on the surface of the dust filter bag 3, and the smoke dust particle impurities remaining in the flue gas are effectively purified, thereby reducing the pollution of the flue gas emission to the environment; after working continuously for a period of time, it is necessary to open the box 1 regularly, and clean the dust filter bag 3 and the dust removal tube 2 to ensure the smooth and continuous dust removal and purification of the flue gas and the recovery of waste heat.

[0046] Embodiment 2:

[0047] On the basis of Example 1, a dust removal plate 4 is provided in the air outlet area 15, and a cleaning pipe 23 is provided in the heat exchange gap 22. The cleaning pipe 23 passes through each limiting ring 21 in sequence, and the end of the cleaning pipe 23 is communicated with the dust removal chamber 41 provided inside the dust removal plate 4. The dust removal chamber 41 is communicated with the external air supply equipment through a metal telescopic hose, and the cleaning pipe 23 is communicated with the heat exchange gap 22.

[0048] The ring-shaped cleaning pipe 23 passes through the dust filter bag 3 at the corresponding position, and can be used as a part of the internal support frame of the dust filter bag 3 to support and stabilize the dust filter bag 3;

[0049] Specific work flow: On the basis of the specific work flow in Example 1, in order to ensure the continuous purification of flue gas, it is necessary to perform real-time purification treatment on the dust filter bag 3 inside the box body 1; therefore, after working for a period of time, stop inputting flue gas to the air inlet 11, and then connect the air outlet 12 to the air supply equipment, and the air inlet 11 to the processing equipment, and the processing equipment here is a related purification equipment dedicated to processing smoke dust particle impurities; a flushing airflow is sent inward from the air outlet 12, and the airflow flows from the air outlet area 15 to the air inlet area 14 inside the heat exchange area 13. During this process, the airflow flows from the outside to the inside of the dust filter bag 3, and the impact vibration causes the particle impurities adhered to the inner surface of the dust filter bag 3 to fall off, and then flows toward the air inlet 11 under the action of the airflow, so that the particle impurities flow into the processing equipment along with the flushing airflow;

[0050] At the same time, a portion of the purified airflow is introduced into the dust removal chamber 41, so that the airflow flows into the heat exchange gap 22 along the cleaning pipe 23, and flows from the outside to the inside of the dust removal pipe 2, so that the particulate impurities adhering to the inner surface of the dust removal pipe 2 fall off under the backwashing effect of the airflow, and flow toward the air inlet 11 along the lateral airflow inside the dust removal pipe 2;

[0051] Furthermore, the airflow flowing from the outside to the inside of the dust removal pipe 2 in the heat exchange gap 22 can, on the one hand, fully clean the particulate impurities adhering to the inner wall of the dust removal pipe 2, thereby ensuring the permeability of the dust removal pipe 2; on the other hand, the reverse airflow from the outside to the inside flushes the dust removal pipe 2, thereby effectively preventing the particulate impurities fallen from the dust filter bag 3 from re-adhering to the inner wall of the dust removal pipe 2 when flowing along the inner wall of the dust removal pipe 2, thereby allowing the fallen particulate impurities to flow smoothly into the direction of the air inlet 11, thereby ensuring the smooth online self-cleaning of the dust removal pipe 2 and the dust removal filter bag 3, thereby reducing the frequency of manual cleaning and increasing the continuous working time of the device of the present application.

[0052] Embodiment three:

[0053] On the basis of the second embodiment, the limiting ring 21 is in sliding contact with the inner wall of the heat exchange tube 16, and annular scrapers 24 are arranged on the two side surfaces of the limiting ring 21, and the ends of the scrapers 24 are in contact with the inner wall of the heat exchange tube 16; the dust removal plate 4 is connected to the telescopic device arranged on the side wall of the gas outlet area 15; the interior of the limiting ring 21 is hollow to form a purification chamber 211, and the purification chamber 211 is communicated with the connecting hole 231 arranged on the cleaning tube 23, and an impact hole 241 is arranged on the end of the scraper 24, and the impact hole 241 is communicated with the purification chamber 211.

[0054] Specific work flow: Based on the specific work flow in Example 2, because the limit ring 21 is slidably connected to the inner wall of the heat exchange tube 16, and the limit ring 21 is fixedly connected to the dust removal tube 2, the entire dust removal tube 2 and the heat exchange tube 16 are slidably connected; the limit ring 21 can be made of copper or copper alloy, which has good thermal conductivity, and the copper material has self-lubricating properties, making the sliding smoother;

[0055] During the cleaning process, the telescopic device can be started to drive the dust removal plate 4 away from the heat exchange tube 16, and at this time, the dust removal tube 2 and the limit ring 21 are also driven to slide along the inner wall of the dust removal tube 2; in this process, when sliding to the maximum distance, the end of the dust removal tube 2 remains inside the heat exchange tube 16, that is, the heat exchange tube 16 and the dust removal tube 2 will not be completely separated;

[0056] As the main part of the dust removal pipe 2 moves into the gas outlet area 15, the outer surface of the dust removal pipe 2 is fully in contact with the flushing airflow flowing into the gas outlet area 15, so that the flushing airflow can directly flow inward through the outer surface of the dust removal pipe 2, and then flow toward the inside of the heat exchange tube 16, further flushing away the particulate impurities adhering to the inner wall of the dust removal pipe 2, thereby ensuring the passability of the dust removal pipe 2; after the cleaning is completed, the telescopic device is controlled to drive the dust removal plate 4 and the dust removal pipe 2 to reset, and then slide and embed them into the heat exchange tube 16 again;

[0057] Furthermore, as the dust removal pipe 2 and the limiting ring 21 slide back and forth, the ends of the annular scrapers 24 arranged on the two side surfaces of the limiting ring 21 scrape the inner wall of the heat exchange tube 16, and the dirt formed by the particles passing through the inner wall of the dust removal pipe 2 and adhering to the inner wall of the heat exchange tube 16 due to their small size is removed; in order to improve the purification efficiency of the inner wall of the heat exchange tube 16, the cleaning pipe 23 is connected to the purification chamber 211, so that the flushing airflow flowing into the heat exchange gap 22 first flows into the purification chamber 211, and then flows from the impact hole 24 at the end of the scraper 24. 1 outflow; in this way, when the end of the scraper block 24 scrapes the impurities and dirt that may be adhered to the inner wall of the heat exchange tube 16, the impact airflow flowing out of the impact hole 241 flushes the contact gap between the scraper block 24 and the heat exchange tube 16, which can improve the flushing and cleaning efficiency of the scraper block 24 on the inner wall of the heat exchange tube 16, and in the process of the scraper block 24 scraping the inner wall of the heat exchange tube 16, the particle impurities dropped in the contact gap are taken away in time, thereby reducing the situation where the particle impurities in the contact gap cause scratches on the inner wall of the heat exchange tube 16 as the scraper block 24 slides, thereby ensuring the service life of the heat exchange tube 16.

[0058] Embodiment 4:

[0059] On the basis of the third embodiment, a guide ring 25 is provided at a position corresponding to the heat exchange gap 22 inside the dust removal pipe 2. The guide ring 25 is a conical structure, and the conical end of the middle part of the guide ring 25 points to the direction close to the air inlet area 14; the guide ring 25 is connected to the dust removal plate 4 through a connecting rod 251 provided in the middle part, and the diameter of the connecting rod 251 is smaller than the opening at the end of the guide ring 25, so it does not affect the airflow passing through the middle opening of the guide ring 25; the outer circular end of the guide ring 25 is in sliding contact with the inner wall of the dust removal pipe 2, and the connecting rod 251 is connected to the output end of the propulsion device 252 inside the dust removal plate 4. The propulsion device 252 here can be a small electric telescopic device, which drives the guide ring 25 to slide laterally along the inner wall of the dust removal pipe 2 under the action of an external controller;

[0060] Specific work flow: On the basis of the specific work flow in Example 3, when the flue gas is introduced into the air inlet 11 and the waste heat of the flue gas is collected, the heat exchange gap 22 between the heat exchange tube 16 and the dust removal tube 2 is divided into a plurality of small heat exchange gaps 22 by the evenly distributed limiting rings 21; each small heat exchange gap 22 is correspondingly distributed with a guide ring 25, and when the flue gas flows into the heat exchange tube 16, it contacts the guide ring 25 at the corresponding position of the small heat exchange gap 22. Because the guide ring 25 is a conical structure, the flue gas flowing from the air inlet area 14 flows toward the direction close to the heat exchange gap 22 under the guidance of the conical surface of the guide ring 25, so that more flue gas passes through the dust removal tube 2 and flows into the heat exchange gap 22 area and repeatedly contacts with the heat exchange tube 16, thereby improving the heat recovery efficiency of the flue gas;

[0061] Then, the flue gas flows in the heat exchange gap 22 and is intercepted by the next limiting ring 21. Under the guidance of the inclined surface of the scraper block 24 on the limiting ring 21, the flue gas passes through the dust removal pipe 2 again and flows into the inside of the dust removal pipe 2, and flows into the next small heat exchange gap 22, and the above process is repeated. In such repeated processes, the flow path of the flue gas is increased, so that the residence time of the flue gas in the heat exchange pipe 16 is increased, and the contact time with the heat exchange pipe 16 is also increased, which further improves the waste heat recovery efficiency of the flue gas.

[0062] Furthermore, when the supply of flue gas is stopped and the flushing airflow begins to be supplied inward from the air outlet area 15, facing the flushing airflow flowing from the air outlet area 15, the propulsion device 252 is controlled to adjust the position of the guide ring 25 on the heat exchange tube 16 through the connecting rod 251, so that the end of the guide ring 25 in contact with the inner wall of the dust removal tube 2 moves to a position overlapping with the limiting ring 21; in this way, when the flushing airflow mixed with a large amount of smoke and dust impurities passing through the dust filter bag 3 approaches the small section of the heat exchange gap 22, it is intercepted by the limiting ring 21 and the guide ring 25, so that after the flushing airflow is intercepted, it is concentrated to the outlet of the guide ring 25 close to the air inlet area 14 under the action of the guide ring 25. At this time, the flushing airflow is concentrated to the middle position of the heat exchange tube 16, reducing the contact between the flushing airflow and the inner wall of the dust removal tube 2, thereby reducing the situation where the particulate impurities mixed in the flushing airflow adhere to the inner wall of the dust removal tube 2 again, thereby ensuring the passability of the dust removal tube 2.

[0063] Embodiment five:

[0064] On the basis of Example 4, the outer circular end portion of the guide ring 25 extends horizontally to form a scouring portion 253, and the outer surface of the scouring portion 253 is evenly provided with transverse guide grooves 254; the guide groove 254 is a conical groove structure, and the small end of the guide groove 254 is located close to the air outlet area 15, preventing the flushing air flow flowing from the air outlet area 15 from entering the guide groove 254; the inner wall of the guide groove 254 is evenly provided with cleaning cone blocks 255, and the width of the cleaning cone blocks 255 is smaller than the width of the guide groove 254.

[0065] An inner wall of the guide groove 254 is provided with a suction hole 256 in the area located in the gap between the cleaning cone blocks 255 , and the suction hole 256 connects the gap area of ​​the cleaning cone blocks 255 and the inner area of ​​the guide ring 25 .

[0066] Specific working process: Based on the specific working process in the fourth embodiment, when smoke flows in, in order to reduce the impact of smoke on the guide ring 25, on the one hand, part of the smoke is forced to pass through the opening in the middle of the guide ring 25, and on the other hand, by evenly arranging guide grooves 254 on the outer surface of the scouring portion 253 of the guide ring 25, part of the smoke flowing from the inside to the outside along the conical surface of the guide ring 25 flows into the guide grooves 254 and passes through the guide grooves 254, thereby reducing the impact of smoke on the guide ring 25;

[0067] Furthermore, the guide groove 254 is a conical groove structure, so the gap between the inner wall of the guide groove 254 and the dust removal pipe 2 becomes smaller and smaller toward the direction close to the air outlet 12. Therefore, the flue gas flowing along the guide groove 254 is directed to flow toward the heat exchange gap 22 under the guidance of the inclined inner wall, so that part of the flue gas flowing into the guide groove 254 is slowly pressed into the heat exchange gap 22 during the process of flowing along the inner wall of the guide groove 254, so that more flue gas enters the heat exchange gap 22 and contacts the heat exchange tube 16, while reducing the instantaneous impact on the guide ring 25.

[0068] Furthermore, cleaning cone blocks 255 are evenly arranged inside the guide ring 25. When the flushing airflow is introduced for cleaning, after the dust filter bag 3 is cleaned, the flushing airflow can be introduced through the dust removal chamber 41 alone, and the propulsion device 252 is started at the same time to drive the guide ring 25 to slide back and forth laterally; in this process, the cleaning cone blocks 255 on the inner wall of the guide groove 254 impact and scrape the inner wall of the dust removal pipe 2, accelerating the falling of smoke and dust impurities on the inner wall of the dust removal pipe 2;

[0069] In addition, in conjunction with the flushing airflow flowing from the insulation gap toward the inside of the dust removal pipe 2, a portion of the flushing airflow flows into the inner wall of the dust removal pipe 2, and then flows into the guide ring 25 to form a concentrated airflow; the other portion flows into the gap between the flushing portion 253 and the inner wall of the dust removal pipe 2, and flows laterally along the guide groove 254; because the width of the cleaning cone block 255 is smaller than the guide groove 254, the flushing airflow flowing into the guide groove 254 can pass through the gap between the two sides of the cleaning cone block 255 and the side wall of the guide groove 254, and take away the smoke and dust impurities accumulated in the gap of the cleaning cone block 255; at the same time, because the airflow is guided by the conical annular structure in the guide ring A concentrated airflow is formed in the middle position inside the guide ring 25. The velocity of the airflow increases and the air pressure decreases inside the guide ring 25 due to the narrow tube effect. Therefore, the smoke and dust impurities located in the gap of the cleaning cone block 255 are sucked into the middle position inside the guide ring 25 from the suction hole 256 and mixed into the concentrated airflow, which causes it to flow toward the middle path of the dust removal pipe 2. In this way, the smoke and dust impurities scraped off from the gap of the flushing part 253 can be taken away in time, and the flow of the smoke and dust impurities tends to be concentrated, and the situation of adhering to the inner wall of the dust removal pipe 2 again is reduced, thereby improving the cleaning efficiency of the dust removal pipe 2 and ensuring the normal progress of the subsequent waste heat collection operation.

[0070] Embodiment six:

[0071] Based on the above embodiments, as shown in the accompanying drawings of the specification Figure 8 As shown, a converter flue gas dust removal and waste heat recovery method, wherein the converter flue gas dust removal and waste heat recovery method uses the above-mentioned converter flue gas dust removal and waste heat recovery device, and the specific steps of the converter flue gas dust removal and waste heat recovery method are:

[0072] S1: The flue gas that has undergone preliminary purification treatment is introduced into the air inlet area 14 inside the flue gas treatment box through the air inlet 11, so that it flows into the heat exchange tube 16 of the heat exchange area 13 and flows along the inside of the heat exchange tube 16;

[0073] S2: Start the water pump device inside the connecting pipe 162 connected to the upper water tank 17, so that the water stored in the upper water tank 17 is introduced into the heat absorption chamber 161 through the connecting pipe 162, then flows along the heat absorption chamber 161, and flows into the lower water tank 18 from the connecting pipe 162 connected to the heat absorption chamber 161, repeatedly absorbing the heat of the flue gas flowing inside the heat exchange tube 16;

[0074] S3: The temperature of the heated water is detected in the lower water tank 18. If the temperature does not reach the predetermined temperature, the heated water is introduced into the upper water tank 17 through the pipeline, circulated and heated again, and then the heated water is guided to the outside for use after reaching the predetermined temperature.

[0075] S4: After passing through the heat exchange tube 16, the flue gas needs to pass through the dust filter bag 3 provided on the end of the heat exchange tube 16. In the process of penetrating the dust filter bag 3, the residual smoke in the flue gas is left on the surface of the dust filter bag 3. The flue gas at the air outlet 12 is tested and discharged normally if it meets the emission standards.

[0076] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A converter flue gas dust removal and waste heat recovery device, comprising a dust removal component and a waste heat recovery component, the waste heat recovery component comprising a flue gas treatment box, the flue gas treatment box comprising a box body (1), and an air inlet (11) and an air outlet (12) are respectively arranged on both sides of the box body (1); Features: The middle area inside the box (1) is a heat exchange area (13), and the areas inside the box (1) located on both sides of the heat exchange area (13) are respectively an air inlet area (14) and an air outlet area (15), and the air inlet area (14), the heat exchange area (13) and the air outlet area (15) are separated by a partition; a heat exchange tube (16) is transversely arranged in the heat exchange area (13), and the two side ends of the heat exchange tube (16) are respectively connected to the air inlet area (14) and the air outlet area (15); the side wall of the heat exchange tube (16) is hollow to form a heat absorption cavity (161), and the two side ends of the heat absorption cavity (161) are respectively connected to an upper water tank (17) at the top of the box (1) and a lower water tank (18) at the bottom of the box (1) through a connecting pipe (162); The dust removal assembly comprises a dust removal pipe (2) and a dust removal filter bag (3); the dust removal pipe (2) is a metal mesh structure and is located in the middle of the heat exchange pipe (16); a heat exchange gap (22) between the outer surface of the dust removal pipe (2) and the inner wall of the heat exchange pipe (16) is evenly provided with a limiting ring (21); the limiting ring (21) limits the position of the dust removal pipe (2); the dust removal filter bag (3) is located inside the gas outlet area (15) and is connected to the limiting ring (21) close to the gas outlet area (15); The limiting ring (21) is in sliding contact with the inner wall of the heat exchange tube (16), and annular scrapers (24) are provided on the two side surfaces of the limiting ring (21), and the ends of the scrapers (24) are in contact with the inner wall of the heat exchange tube (16).

2. The converter flue gas dust removal and waste heat recovery device according to claim 1, characterized in that: A dust removal plate (4) is provided in the air outlet area (15), a cleaning pipe (23) is provided in the heat exchange gap (22), the cleaning pipe (23) passes through each of the limiting rings (21) in sequence, and the end of the cleaning pipe (23) is communicated with a dust removal chamber (41) provided inside the dust removal plate (4), the dust removal chamber (41) is communicated with an external air supply device, and the cleaning pipe (23) is communicated with the heat exchange gap (22).

3. The converter flue gas dust removal and waste heat recovery device according to claim 2, characterized in that: The dust removal plate (4) is connected to a telescopic device arranged on the side wall of the air outlet area (15).

4. The converter flue gas dust removal and waste heat recovery device according to claim 3, characterized in that: The limiting ring (21) is hollow inside to form a purification chamber (211), the purification chamber (211) is in communication with a connecting hole (231) provided on the cleaning tube (23), and an impact hole (241) is provided on the end of the scraper block (24), the impact hole (241) is in communication with the purification chamber (211).

5. The converter flue gas dust removal and waste heat recovery device according to claim 4, characterized in that: A guide ring (25) is provided at a position inside the dust removal pipe (2) corresponding to the heat exchange gap (22); the guide ring (25) is a conical structure, and the conical end of the middle portion of the guide ring (25) points in a direction close to the air intake area (14); the guide ring (25) is connected to the dust removal plate (4) via a connecting rod (251) provided at the middle portion.

6. The converter flue gas dust removal and waste heat recovery device according to claim 5, characterized in that: The outer circular end of the guide ring (25) is in sliding contact with the inner wall of the dust removal pipe (2), and the connecting rod (251) is connected to the output end of the propulsion device (252) inside the dust removal plate (4).

7. The converter flue gas dust removal and waste heat recovery device according to claim 6, characterized in that: The outer circular end portion of the guide ring (25) extends horizontally to form a scouring portion (253), and the outer surface of the scouring portion (253) is evenly provided with transverse guide grooves (254); the guide grooves (254) are of a conical groove structure, and the small end of the guide groove (254) is located close to the gas outlet area (15).

8. The converter flue gas dust removal and waste heat recovery device according to claim 7, characterized in that: Cleaning cone blocks (255) are evenly arranged on the inner wall of the guide groove (254), and the width of the cleaning cone blocks (255) is smaller than the width of the guide groove (254).

9. The converter flue gas dust removal and waste heat recovery device according to claim 8, characterized in that: An inner wall of the guide groove (254) is provided with a suction hole (256) in an area located in the gap between the cleaning cone blocks (255), and the suction hole (256) communicates with the gap area of ​​the cleaning cone blocks (255) and the inner area of ​​the guide ring (25).

10. A converter flue gas dust removal and waste heat recovery method, using the converter flue gas dust removal and waste heat recovery device according to any one of claims 1 to 9, characterized in that: The specific steps of the converter flue gas dust removal and waste heat recovery method are: S1: The flue gas that has undergone preliminary purification treatment is introduced into the air inlet area (14) inside the flue gas treatment box through the air inlet (11), so that the flue gas is concentrated and flows into the heat exchange tube (16) of the heat exchange area (13), and flows along the inside of the heat exchange tube (16); S2: starting the water pump device inside the connecting pipe (162) connected to the upper water tank (17), so that the water stored in the upper water tank (17) is introduced into the heat absorption chamber (161) through the connecting pipe (162), then flows along the heat absorption chamber (161), and flows into the lower water tank (18) from the connecting pipe (162) connected to the heat absorption chamber (161), repeatedly absorbing the heat of the flue gas flowing inside the heat exchange tube (16); S3: The temperature of the heated water is detected in the lower water tank (18). If the temperature does not reach the predetermined temperature, the heated water is introduced into the upper water tank (17) through a pipeline, and circulated and heated again until the temperature reaches the predetermined temperature. The heated water is then guided to the outside for use. S4: After the flue gas passes through the heat exchange tube (16), it needs to pass through the dust filter bag (3) provided at the end of the heat exchange tube (16). In the process of passing through the dust filter bag (3), the smoke remaining in the flue gas is left on the surface of the dust filter bag (3). The flue gas at the air outlet (12) is tested and discharged normally if it meets the emission standards.

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