Continuous annealing furnace roller bottom waste heat recovery device
By designing a continuous annealing furnace roller bottom waste heat recovery device, the circulating water in the water-cooled roller is heated by using the flue gas waste heat of the annealing furnace to heat the circulating water in the water-cooled roller, the problems of large heat loss and low recovery efficiency of the annealing furnace are solved, and efficient heat recovery and utilization are achieved.
Patent Information
- Application Number
- CN202510137587.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-04-25
AI Technical Summary
During the operation of the annealing furnace, the water-cooled furnace bottom roller needs to be withdrawn by a large amount, which leads to a heavy burden on the circulating water system and is unable to effectively utilize the heat in the hot water.
A continuous annealing furnace roller bottom waste heat recovery device is designed, and the flue gas waste heat of the annealing furnace is recovered through the waste heat recovery mechanism, and the recovered heat is converted into low-pressure steam by using a steam gas-liquid separator and a steam compressor for other processes.
The heat recovery and utilization of water-cooled rollers and annealing furnace flue gas is realized, reducing heat loss, improving heat utilization efficiency, and reducing the burden on the cooling water system.
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Figure CN119879578A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of waste heat recovery of annealing furnaces, and in particular to a waste heat recovery device for a roller bottom of a continuous annealing furnace. Background Art
[0002] In the cold rolling process of the steel industry, the continuously heated roller-hearth furnace is the main industrial furnace type for heat treatment of various plates, pipes, bars and long profiles. After decades of continuous technological progress and improvement of equipment level, the roller-hearth furnace has shown its outstanding advantages in continuous production (high production capacity), uniform temperature control (good temperature control), automatic application and energy saving and consumption reduction. The hearth roller of the roller-hearth furnace is a key structural component in the furnace structure. It bears the load of the charge and is responsible for the task of conveying the charge through the furnace in a high-temperature heating environment. Generally, the roller-hearth furnace has different requirements for the use of the hearth roller according to the different heat treatment process requirements (such as tempering, annealing, spheroidizing annealing and quenching and solution treatment, etc.), so the design optimization of the hearth roller scheme is very important.
[0003] The furnace bottom rollers are divided into water-cooled furnace rollers and empty water-free furnace rollers. The water-cooled furnace rollers are cooled by circulating cooling water, which has a low temperature and is not easy to damage. However, their disadvantage is that the heat loss is large. Under normal circumstances, the heat withdrawn by the circulating water at the bottom of the roller is 10-15% of the total heat. For long-term use, the heat cost is worthy of attention. The water-free furnace rollers have low heat loss and have become the first choice for many large enterprises. However, the water-free furnace rollers are made of special alloy materials, and the price is 3-4 times that of water-cooled furnace rollers. In addition, the operation requirements are very high and the production product requirements are relatively stable, which is beneficial to a single product, which seriously limits the use of water-free furnace rollers in small enterprises.
[0004] In production practice, the heat that needs to be removed from the water-cooled hearth rollers during the operation of the annealing furnace includes heat transferred by convection, radiation, etc., and circulating water is needed for circulating heat removal. The temperature of the circulating water outlet is even as high as 70°C, which puts a lot of pressure on the circulating water system. Therefore, companies using water-cooled hearth rollers need to set up a huge cooling water system. However, even if the circulating water temperature reaches 60-70°C, it cannot be used for other purposes such as pickling and emulsion preheating except for winter heating, resulting in a waste of heat contained in hundreds of cubic meters of hot water per hour. Therefore, we propose a waste heat recovery device for the roller bottom of a continuous annealing furnace, which can better recycle the heat of the annealing furnace bottom rollers. Summary of the invention
[0005] The present invention provides a device for recovering waste heat from the bottom of a roller of a continuous annealing furnace, which solves the problems of large heat loss and low recovery efficiency of the annealing furnace in the related art.
[0006] The technical solution of the present invention is as follows: A waste heat recovery device for a roller bottom of a continuous annealing furnace, comprising a water-cooled roller, and further comprising: A water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively connected to two ends of the water-cooled roller, and valves are installed on the water inlet pipe and the water outlet pipe; A waste heat recovery mechanism, which is used to recover the waste heat of the flue gas of the annealing furnace and heat the circulating water in the water-cooling roller. The waste heat recovery mechanism includes: An evaporation chamber, wherein the evaporation chamber is connected to a water inlet, and the water outlet pipe is connected to the water inlet; A heat exchange tube, wherein a plurality of heat exchange tubes are provided and the heat exchange tubes are connected to the bottom of the evaporation bin; A hot water boiler, wherein the hot water boiler is located below the evaporation bin, the heat exchange tube is located inside the hot water boiler, and the hot water boiler is connected to an annealing furnace flue gas inlet pipe and a cooling flue gas outlet pipe; A steam gas-liquid separator, wherein the steam gas-liquid separator is connected with an air inlet and an air outlet, the steam generated by the waste heat recovery mechanism enters the interior of the steam gas-liquid separator through the air inlet, and the bottom liquid outlet of the steam gas-liquid separator is connected with the waste heat recovery mechanism for reflow of the separated liquid; A steam compressor, wherein the inlet of the steam compressor is connected to the outlet of the steam gas-liquid separator.
[0007] In order to improve the heat exchange effect between the heat exchange tube and the annealing furnace flue gas, a plurality of partitions are fixedly connected inside the hot water boiler, through openings are opened on the partitions, and a plurality of guide plates are fixedly connected between two adjacent partitions. There is a gap between one end of the guide plate and the inner wall of the hot water boiler, and the adjacent guide plates are staggered.
[0008] In order to reduce the influence of water flow on the rising of steam, a buffer component is provided at the water inlet, and the buffer component is used to buffer the incoming water. The buffer component includes: A buffer plate is connected to the inner wall of the evaporation bin through a telescopic rod and a buffer spring, and the positions of the buffer plate and the water inlet correspond to each other.
[0009] In order to improve the evaporation efficiency of the circulating water, a quantitative water supply mechanism is also included, and the quantitative water supply mechanism is used to allow the circulating water to enter the interior of the heat exchange tube in a quantitative manner. The quantitative water supply mechanism includes: An interception groove, the interception groove is fixedly connected to the inside of the evaporation bin, the interception groove is located below the water inlet, and a plurality of water drop holes are opened at the bottom of the interception groove; A sponge pad, the sponge pad is located inside the interception groove; An extrusion component is used to extrude the sponge pad to squeeze out the water inside the sponge pad. The extrusion component includes: A pressing plate is movably arranged on the stopping groove, and the pressing plate is in contact with the sponge pad.
[0010] In order to realize the movement of the extrusion plate, a driving assembly is also included, and the driving assembly is used to drive the extrusion plate to move. The driving assembly includes: An air supply pipe, the air supply pipe is located inside the evaporation bin, and the air supply pipe is connected to a cooling flue gas outlet pipe of the hot water boiler; A telescopic drive tube, one end of which is connected to the air supply tube, and the other end of which is fixedly connected to the extrusion plate; The exhaust pipe, the cooling flue gas outlet pipe is connected to the air supply pipe and the exhaust pipe through a three-way valve, the air supply pipe is connected to the air supply pipe, and the air supply pipe is connected to the air supply pipe and the exhaust pipe through a three-way valve.
[0011] In order to reduce the condensation of steam when entering the steam gas-liquid separator, the evaporation bin is connected to the air inlet of the steam gas-liquid separator through a steam pipe, and the outside of the steam pipe is fixedly sleeved with an insulation cover, and the insulation cover is connected to the annealing furnace flue gas inlet pipe of the hot water boiler.
[0012] In order to replace the sponge pad, a replacement opening is opened on the evaporation bin for the sponge pad to pass through when being replaced, and a replacement plate is detachably connected to the replacement opening.
[0013] In order to improve the heat exchange efficiency between the flue gas and the circulating water, a plurality of heat exchange fins are fixedly connected to the outside of the heat exchange tube.
[0014] The working principle and beneficial effects of the present invention are: 1. In the present invention, the circulating water in the water-cooled roller enters the interior of the evaporation bin and flows into the heat exchange tube, the flue gas generated by the annealing furnace enters the interior of the hot water boiler, the flue gas flows along the partition and the guide plate, and fully contacts the heat exchange tube, and heats the circulating water in the heat exchange tube. The steam generated by the heating enters the interior of the steam gas-liquid separator, and a steam compressor is provided to reduce the pressure of the preheated hot water to generate negative pressure steam. After compression and pressure increase, the temperature is increased, and the low-pressure steam is obtained and directly used in other cold rolling processes, thereby realizing the recovery and utilization of heat in the water-cooled roller and the flue gas of the annealing furnace.
[0015] 2. In the present invention, the circulating water enters the interior of the interception groove and is absorbed by the sponge pad. The cooling flue gas outlet pipe and the air supply pipe are connected through the three-way valve. The flue gas enters the interior of the air supply pipe and the telescopic drive pipe, and the extrusion plate is driven to move to squeeze the sponge pad, so that part of the water inside the sponge pad is squeezed out and falls into the interior of the heat exchange tube through the water drop hole, thereby realizing quantitative evaporation of the circulating water. Less water is heated by the flue gas at the same time, thereby ensuring the evaporation efficiency of the circulating water.
[0016] 3. Therefore, compared with the annealing furnace waste heat recovery method in the prior art, the present invention passes the circulating water in the water-cooled roller into the interior of the heat exchange tube, the annealing furnace flue gas enters the interior of the hot water boiler to heat the circulating water in the heat exchange tube, the steam enters the interior of the steam gas-liquid separator, and the water flows back to the interior of the evaporation bin to continue heating and evaporation. The steam compressor increases the pressure of the steam to obtain low-pressure steam that is directly used for other cold rolling processes, thereby realizing the recovery and utilization of heat in the water-cooled roller and the annealing furnace flue gas. At the same time, the cooling flue gas intermittently enters the interior of the telescopic drive tube, pushing the extrusion plate to squeeze the sponge pad, so that the circulating water intermittently falls into the interior of the heat exchange tube, ensuring the efficiency of evaporation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] Figure 1 It is a structural schematic diagram of the first viewing angle of the present invention; Figure 2 It is a structural schematic diagram of the second viewing angle of the present invention; Figure 3 It is a structural schematic diagram of the waste heat recovery mechanism and the buffer component of the present invention; Figure 4 It is a schematic diagram of the structure of the evaporation chamber, heat exchange tubes, water inlet and heat exchange fins of the present invention; Figure 5 It is a schematic diagram of the structure of the partition plate and the guide plate of the present invention; Figure 6 It is a structural schematic diagram of the quantitative water delivery mechanism of the present invention; Figure 7 For the present invention Figure 3 A schematic diagram of the local enlarged structure at point A in the middle; Figure 8 For the present invention Figure 6 Schematic diagram of the local enlarged structure at point B in the middle.
[0019] In the figure: 1. Water-cooled roller; 2. Water inlet pipe; 3. Water outlet pipe; 4. Steam gas-liquid separator; 5. Steam compressor; 6. Air inlet; 7. Air outlet; 8. Bottom liquid outlet; 9. Insulation cover; 10. Steam pipe; 101, evaporation chamber; 102, heat exchange tube; 103, hot water boiler; 104, water inlet; 105, heat exchange plate; 106, annealing furnace flue gas inlet pipe; 107, cooling flue gas outlet pipe; 108, partition; 109, guide plate; 201, buffer plate; 202, buffer spring; 301, stop groove; 302, sponge pad; 401, extruded plate; 501, air supply pipe; 502, telescopic drive pipe; 503, exhaust pipe; 504, air delivery pipe; 505, air release pipe. DETAILED DESCRIPTION
[0020] The following will be combined with 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.
[0021] like Figures 1 to 8 As shown, this embodiment proposes a waste heat recovery device for the bottom of a continuous annealing furnace roller, comprising a water-cooled roller 1, a water inlet pipe 2, a water outlet pipe 3, a waste heat recovery mechanism, a steam gas-liquid separator 4 and a steam compressor 5. Compared with the waste heat recovery method of the annealing furnace in the prior art, the present invention passes the circulating water in the water-cooled roller 1 into the interior of the heat exchange tube 102, the annealing furnace flue gas enters the interior of the hot water boiler 103 to heat the circulating water in the heat exchange tube 102, the steam enters the interior of the steam gas-liquid separator 4, and the water flows back to the interior of the evaporation bin 101 to continue heating and evaporation. The steam compressor 5 increases the pressure of the steam to obtain low-pressure steam that is directly used for other cold rolling processes, thereby realizing the recovery and utilization of heat in the water-cooled roller 1 and the annealing furnace flue gas. At the same time, the cooling flue gas intermittently enters the interior of the telescopic drive tube 502, pushes the extrusion plate 401 to squeeze the sponge pad 302, and makes the circulating water intermittently fall into the interior of the heat exchange tube 102 to ensure the efficiency of evaporation.
[0022] The water inlet pipe 2 and the water outlet pipe 3 are respectively connected to the two ends of the water-cooled roller 1, and valves are installed on the water inlet pipe 2 and the water outlet pipe 3. The water inlet pipe 2 and the water outlet pipe 3 are both rotatably connected to the water-cooled roller 1. The circulating water enters the interior of the water-cooled roller 1 through the water inlet pipe 2, and then the circulating water is discharged through the water outlet pipe 3.
[0023] The waste heat recovery mechanism is used to recover the waste heat of the flue gas of the annealing furnace and heat the circulating water in the water-cooled roller 1. The waste heat recovery mechanism includes an evaporation bin 101, a heat exchange pipe 102 and a hot water boiler 103. The evaporation bin 101 is connected to a water inlet 104, and a water outlet pipe 3 is connected to the water inlet 104. A plurality of heat exchange pipes 102 are provided. The heat exchange pipe 102 is connected to the bottom of the evaporation bin 101. A plurality of heat exchange plates 105 are fixedly connected to the outside of the heat exchange pipe 102. The hot water boiler 103 is located below the evaporation bin 101. The heat exchange pipe 102 is located inside the hot water boiler 103. The hot water boiler 103 is connected to the annealing furnace flue gas inlet pipe 106 and the cooling flue gas outlet pipe 107. The circulating water in the water-cooled roller 1 enters the interior of the evaporation bin 101 through the outlet pipe 3. The evaporation bin 101 is cylindrical. The circulating water falls into the interior of the heat exchange pipe 102. The annealing furnace flue gas passes through the annealing The furnace flue gas inlet pipe 106 enters the interior of the hot water boiler 103, and the waste heat of the flue gas heats the circulating water and cools the annealing furnace flue gas at the same time. The circulating water evaporates to generate steam. In order to improve the heat exchange effect between the heat exchange tube 102 and the annealing furnace flue gas, a plurality of partitions 108 are fixedly connected to the interior of the hot water boiler 103. Through holes are opened on the partitions 108, and a plurality of guide plates 109 are fixedly connected between two adjacent partitions 108. There is a gap between one end of the guide plate 109 and the inner wall of the hot water boiler 103. The adjacent guide plates 109 are staggered. The hot water boiler 103 is divided into a plurality of interconnected spaces by the partitions 108 and the guide plates 109, so that the flue gas flows along a specific track, prolonging the time the flue gas stays in the hot water boiler 103, and at the same time, the heat exchange area between the flue gas and the heat exchange tube 102 is increased by the heat exchange plate 105, thereby improving the efficiency of waste heat recovery.
[0024] The steam gas-liquid separator 4 is connected with an air inlet 6 and an air outlet 7. The steam generated by the waste heat recovery mechanism enters the interior of the steam gas-liquid separator 4 through the air inlet 6, and the liquid flows back to the interior of the waste heat recovery mechanism through the bottom liquid outlet 8 of the steam gas-liquid separator 4. The top of the evaporation bin 101 is connected with a steam pipe 10, and the steam pipe 10 is connected with the air inlet 6. The bottom liquid outlet 8 of the steam gas-liquid separator 4 is connected with the water inlet 104 of the evaporation bin 101. The inlet of the steam compressor 5 is connected with the air outlet 7 of the steam gas-liquid separator 4. The water heated to 60-70°C at the outlet of the water-cooled roller 1 is transported to the negative pressure hot water boiler 103 and is heated by the 200°C flue gas inlet The temperature is raised to 90-95°C in one step, and the pressure of the hot water boiler 103 is reduced to 0.08-0.09MPa (absolute pressure) by the steam compressor 5 at the rear end, forming a gas-liquid mixture that enters the steam gas-liquid separator 4 for separation. The negative pressure steam after separation enters the steam compressor 5 and is pressurized to 0.11-0.13Mpa. The temperature is raised to 120-140°C and is directly used as cold rolling pickling hydrochloric acid preheating and emulsion heating. The used steam is condensed, cooled to 40-50°C and returned to the circulating water system, forming a large cycle to realize the recovery and utilization of the heat of the water-cooled roller 1 and the annealing furnace flue gas, and the separated liquid flows back to the evaporation bin 101 for further evaporation.
[0025] In order to reduce the influence of water flow on the rising of steam, a buffer component is provided at the water inlet 104, and the buffer component is used to buffer the incoming water. The buffer component includes a buffer plate 201, and the buffer plate 201 is connected to the inner wall of the evaporation bin 101 through a telescopic rod and a buffer spring. The positions of the buffer plate 201 and the water inlet 104 correspond. When the circulating water in the water-cooling roller 1 and the liquid separated by the steam gas-liquid separator 4 flow into the evaporation bin 101 through the water inlet 104, the water flow is blocked to a certain extent by the buffer plate 201 to prevent excessive water flow from rushing into the center of the evaporation bin 101 and affecting the rising of the steam, so that the steam condenses when it meets water. The elasticity of the buffer spring 202 and the sliding damping of the telescopic rod are used to buffer and absorb the impact force of the water flow, thereby reducing the flow rate of the water. There is a certain gap between the buffer plate 201 and the inner wall of the evaporation bin 101, so that water can flow into the interior of the heat exchange tube 102.
[0026] In order to improve the evaporation efficiency of the circulating water, a quantitative water supply mechanism is also included. The quantitative water supply mechanism is used to allow the circulating water to enter the interior of the heat exchange tube 102 in a quantitative manner. The quantitative water supply mechanism includes a stop groove 301, a sponge pad 302 and an extrusion assembly. The stop groove 301 is fixedly connected to the interior of the evaporation chamber 101. The stop groove 301 is located below the water inlet 104. A plurality of water drop holes are provided at the bottom of the stop groove 301. The sponge pad 302 is located inside the stop groove 301. The extrusion assembly is used to squeeze the sponge pad 302 to squeeze out the water inside it. The extrusion assembly includes an extrusion plate 401. The extrusion plate 401 is movably arranged on the stop groove 301. The extrusion plate 401 contacts the sponge pad 302 and enters from the water inlet 104. The water falls into the intercepting groove 301 and is absorbed by the sponge pad 302. The intercepting groove 301 intercepts the water to prevent it from falling all the time. The sponge pad 302 is squeezed by the intermittent movement of the squeezing plate 401, and part of the water is squeezed out and falls into the heat exchange tube 102 at a slower speed through the water drop hole, thereby preventing the heat exchange tube 102 from having too much water inside, making it easier for the flue gas to heat the water and evaporate it, thereby ensuring the heat exchange efficiency and the steam generation efficiency. In order to replace the sponge pad 302, a replacement port is opened on the evaporation bin 101 for the sponge pad 302 to pass through when replaced. A replacement plate is detachably connected to the replacement port. In order to ensure the water absorption performance of the sponge pad 302, the replacement plate can be opened regularly to replace the sponge pad 302.
[0027] In order to realize the movement of the extrusion plate 401, a driving component is also included, and the driving component is used to drive the extrusion plate 401 to move. The driving component includes an air supply pipe 501, a telescopic driving pipe 502 and an exhaust pipe 503. The air supply pipe 501 is located inside the evaporation bin 101, and the air supply pipe 501 is connected to the cooling flue gas outlet pipe 107 of the hot water boiler 103. One end of the telescopic driving pipe 502 is connected to the air supply pipe 501, and the other end of the telescopic driving pipe 502 is fixedly connected to the extrusion plate 401. The cooling flue gas outlet pipe 107 is connected to the air supply pipe 504 and the exhaust pipe 503 through a three-way valve. The air supply pipe 504 is connected to the air supply pipe 501. The cooling flue gas outlet pipe 107 is connected to the air supply pipe 504 or the exhaust pipe 503 through the three-way valve. When the cooling flue gas outlet pipe 107 is connected to the air supply pipe 504, the cooled flue gas passes through the air supply pipe 504 and the air supply pipe The tube 501 enters the interior of the telescopic driving tube 502, so that the telescopic driving tube 502 is extended, and the extrusion plate 401 is pushed to extrude the sponge pad 302. Then the three-way valve controls the cooling smoke outlet pipe 107 to be connected with the exhaust pipe 503, and the cooling smoke is directly discharged through the exhaust pipe 503. The air supply pipe 501 is connected with the air supply pipe 504 and the air release pipe 505 through the three-way valve. When it is necessary to extrude the sponge pad 302, the three-way valve connects the air supply pipe 501 with the air supply pipe 504 to supply air to the interior of the telescopic driving tube 502. After extrusion, the three-way valve connects the air supply pipe 501 with the air release pipe 505, and the smoke in the telescopic driving tube 502 is discharged through the air release pipe 505. A return spring is connected between the extrusion plate 401 and the stop groove 301 to drive the extrusion plate 401 to return to its original position to extrude the telescopic driving tube 502.
[0028] In order to reduce the condensation of steam when entering the steam gas-liquid separator 4, the evaporation chamber 101 is connected to the air inlet 6 of the steam gas-liquid separator 4 through the steam pipe 10, and the outside of the steam pipe 10 is fixedly sleeved with a heat preservation cover 9, the heat preservation cover 9 is connected to the annealing furnace flue gas inlet pipe 106 of the hot water boiler 103, and the heat preservation cover 9 is connected to the flue of the annealing furnace. The annealing furnace flue gas enters the interior of the heat preservation cover 9 to heat and insulate the steam pipe 10 to reduce the condensation of steam, and then the flue gas enters the interior of the hot water boiler 103 for heat exchange to heat the circulating water.
[0029] The working principle or use process of the roller bottom waste heat recovery device of the continuous annealing furnace is as follows: The circulating water enters the water-cooled roller 1 through the water inlet pipe 2, and the water-cooled roller 1 heats the circulating water to 60-70°C. Then the circulating water enters the evaporation bin 101 through the water outlet pipe 3, and the water falls into the interception groove 301 and is absorbed by the sponge pad 302. Part of the water falls into the heat exchange tube 102. The flue gas of the annealing furnace enters the hot water boiler 103 through the heat preservation cover 9. The 200°C flue gas further heats the water in the heat exchange tube 102 to 90-95°C. The pressure of the hot water boiler 103 is reduced to 0.08-0.09MPa by the steam compressor 5 at the rear end, forming a gas-liquid mixture that enters the steam gas-liquid separator 4 for separation. The negative pressure steam after separation enters the steam compressor 5 and is pressurized to 0.11-0.13Mpa, and the temperature rises to 120-140°C. , used as other power or heat source, the used steam is condensed, cooled to 40-50℃ and returned to the circulating water system to form a large cycle, the separated water flows back to the evaporation bin 101 to continue evaporation, and the two three-way valves are opened intermittently to connect the cooling flue gas outlet pipe 107 and the air supply pipe 501 with the air delivery pipe 504, and the flue gas enters the interior of the telescopic drive pipe 502, driving the extrusion plate 401 to squeeze the sponge pad 302, so that the circulating water inside it falls into the heat exchange tube 102 for heating, and then the cooling flue gas outlet pipe 107 is connected to the exhaust pipe 503 through the three-way valve, and the air supply pipe 501 is connected to the exhaust pipe 505, and the cooling flue gas is discharged to the outside, and the extrusion plate 401 returns to its original position under the action of the reset spring, and the sponge pad 302 continues to absorb the circulating water.
[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A device for recovering waste heat from the bottom of a roller of a continuous annealing furnace, comprising a water-cooled roller (1), characterized in that: It also includes a water inlet pipe (2), a water outlet pipe (3), a waste heat recovery mechanism, a steam gas-liquid separator (4), a steam compressor (5) and a quantitative water delivery mechanism; The water inlet pipe (2) and the water outlet pipe (3) are respectively connected to two ends of the water-cooled roller (1), and valves are installed on the water inlet pipe (2) and the water outlet pipe (3); The waste heat recovery mechanism is used to recover waste heat from the flue gas of the annealing furnace and heat the circulating water in the water-cooled roller (1); the waste heat recovery mechanism comprises a heat exchange pipe (102) for achieving heat exchange between the circulating water and the flue gas of the annealing furnace; The steam gas-liquid separator (4) is connected to an air inlet (6) and an air outlet (7), and the steam generated by the waste heat recovery mechanism enters the interior of the steam gas-liquid separator (4) through the air inlet (6). The bottom liquid outlet (8) of the steam gas-liquid separator (4) is connected to the waste heat recovery mechanism for reflow of the separated liquid; The inlet of the steam compressor (5) is in communication with the gas outlet (7) of the steam gas-liquid separator (4); The quantitative water supply mechanism is used to allow circulating water to enter the interior of the heat exchange tube (102) in a quantitative manner.
2. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 1, characterized in that: The waste heat recovery mechanism also includes: An evaporation bin (101), the evaporation bin (101) being connected to a water inlet (104), the water outlet pipe (3) being connected to the water inlet (104), a plurality of heat exchange tubes (102) being provided, and the heat exchange tubes (102) being connected to the bottom of the evaporation bin (101); A hot water boiler (103), the hot water boiler (103) being located below the evaporation bin (101), the heat exchange tube (102) being located inside the hot water boiler (103), and the hot water boiler (103) being connected to an annealing furnace flue gas inlet pipe (106) and a cooling flue gas outlet pipe (107).
3. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 2, characterized in that: A plurality of partitions (108) are fixedly connected inside the hot water boiler (103), and a through opening is opened on the partition (108). A plurality of guide plates (109) are fixedly connected between two adjacent partitions (108), and a gap is provided between one end of the guide plate (109) and the inner wall of the hot water boiler (103), and adjacent guide plates (109) are arranged in a staggered manner.
4. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 3, characterized in that: A buffer component is provided at the water inlet (104), and the buffer component is used to buffer incoming water. The buffer component comprises: A buffer plate (201), the buffer plate (201) being connected to the inner wall of the evaporation bin (101) via a telescopic rod and a buffer spring (202), and the positions of the buffer plate (201) and the water inlet (104) corresponding to each other.
5. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 4, characterized in that: The quantitative water delivery mechanism comprises: An interception groove (301), the interception groove (301) being fixedly connected to the inside of the evaporation bin (101), the interception groove (301) being located below the water inlet (104), and a plurality of water drop holes being provided at the bottom of the interception groove (301); A sponge pad (302), the sponge pad (302) being located inside the interception groove (301); An extrusion component is used to squeeze the sponge pad (302) to squeeze out the moisture inside it.
6. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 5, characterized in that: The extrusion assembly comprises: A pressing plate (401), the pressing plate (401) being movably disposed on the interception groove (301), the pressing plate (401) being in contact with the sponge pad (302).
7. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 6, characterized in that: It also includes a driving assembly, the driving assembly is used to drive the extrusion plate (401) to move, and the driving assembly includes: an air supply pipe (501), the air supply pipe (501) being located inside the evaporation bin (101), the air supply pipe (501) being connected to a cooling flue gas outlet pipe (107) of the hot water boiler (103); A telescopic drive tube (502), one end of the telescopic drive tube (502) being in communication with the air supply tube (501), and the other end of the telescopic drive tube (502) being fixedly connected to the extrusion plate (401); The exhaust pipe (503) is connected to the cooling smoke outlet pipe (107) through a three-way valve to an air supply pipe (504) and the exhaust pipe (503); the air supply pipe (504) is connected to the air supply pipe (501); and the air supply pipe (501) is connected to the air supply pipe (504) and an air discharge pipe (505) through a three-way valve.
8. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 7, characterized in that: The evaporation chamber (101) is connected to the air inlet (6) of the steam gas-liquid separator (4) via a steam pipe (10); a heat-insulating cover (9) is fixedly mounted on the outside of the steam pipe (10); and the heat-insulating cover (9) is connected to the annealing furnace flue gas inlet pipe (106) of the hot water boiler (103).
9. The device for recovering waste heat from roller bottom of a continuous annealing furnace according to claim 8, characterized in that: The evaporation chamber (101) is provided with a replacement opening for passing the sponge pad (302) when it is replaced, and a replacement plate is detachably connected to the replacement opening.
10. A continuous annealing furnace roller bottom waste heat recovery device according to claim 9, characterized in that: A plurality of heat exchange fins (105) are fixedly connected to the outside of the heat exchange tube (102).