Waste Heat Recovery Device for Calciner in Preparation of Zeolite from Blast Furnace Slag

Abstract

The present invention relates to the technical field of waste heat recovery of calcining furnaces, and particularly to a waste heat recovery device for a calcining furnace for preparing zeolite from blast furnace slag, and a waste heat recovery cylinder. A heat conduction layer is arranged inside the waste heat recovery cylinder, and the heat conduction layer divides the waste heat recovery cylinder from the inside to the outside into a gas space and a water storage space. A plurality of partition plates are arranged on the waste heat recovery cylinder from top to bottom, and the partition plates divide the gas space and the water storage space into a first gas chamber, a second gas chamber, a third gas chamber, a first water chamber, a second water chamber, and a third water chamber from top to bottom respectively. By dividing the gas space and the water storage space in the waste heat recovery cylinder into a plurality of gas chambers, namely the first gas chamber, the second gas chamber, and the third gas chamber, and water chambers, namely the first water chamber, the second water chamber, and the third water chamber respectively, during the process of the flue gas being transmitted downward step by step, the heat is absorbed step by step, ensuring that the heat in the flue gas is fully recovered, and fully recovering the high, medium, and low temperature heat in the flue gas.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery of calcining furnaces, and particularly to a waste heat recovery device for a calcining furnace for preparing zeolite from blast furnace slag. Background Art

[0002] The waste heat recovery of the calcining furnace for preparing zeolite from blast furnace slag is an important way to achieve efficient resource utilization and clean production. By recovering the waste heat of the flue gas and the cooling system of the calcining furnace, the energy consumption can be effectively reduced, emissions can be reduced, and economic and environmental benefits can be improved. A large amount of waste heat of the flue gas generated during the high-temperature operation of the calcining furnace, if directly discharged, will not only cause energy waste but also increase the environmental burden. Through the waste heat recovery system, this part of thermal energy can be used to preheat raw materials, heat air or generate electricity, significantly reducing the fuel consumption in the production process.

[0003] Existing waste heat recovery devices usually directly discharge the flue gas generated by the calcining furnace into the recovery device, heat water through the heat of the flue gas to generate water vapor, thereby achieving the effect of waste heat recovery. However, existing devices usually simply discharge the flue gas into the recovery device for single-stage waste heat recovery treatment. However, during single-stage treatment, the heat in the flue gas cannot be fully utilized in a graded manner, resulting in low waste heat recovery efficiency; secondly, the high-temperature flue gas may still contain a large amount of medium and low-temperature heat that has not been utilized after single-stage recovery, causing energy waste;

[0004] And existing waste heat recovery devices can only carry out waste heat recovery by stirring the flue gas with a constant water volume and a constant stirring speed, and cannot adjust the water volume to be heated according to the flue gas volume discharged into the waste heat recovery device, nor can they adjust the stirring speed of the flue gas and water according to the flue gas volume. When the flue gas volume fluctuates, the fixed heating water volume may lead to a decrease in heat recovery efficiency, energy waste when the flue gas volume is small, and insufficient heat recovery when the flue gas volume is large; secondly, the stirring speed cannot be adjusted with the flue gas volume, which will affect the heat exchange efficiency between the flue gas and water, resulting in uneven heat transfer and further reducing the waste heat recovery effect; finally, such a device lacking an adaptive adjustment function is difficult to achieve the optimization of energy utilization. Summary of the Invention

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a waste heat recovery device for a calcining furnace for preparing zeolite from blast furnace slag, which can effectively solve the problems that the prior art can only perform single-stage waste heat recovery treatment, cannot adjust the water volume to be heated according to the flue gas volume discharged into the waste heat recovery device, and cannot adjust the stirring speed of the flue gas and water according to the flue gas volume.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] The present invention provides a waste heat recovery device for a calcining furnace for preparing zeolite from blast furnace slag, including:

[0008] A waste heat recovery cylinder, inside which a heat conduction layer is provided. The heat conduction layer divides the waste heat recovery cylinder from the inside out into a gas space and a water storage space. The waste heat recovery cylinder is provided with a plurality of partition plates from top to bottom. The partition plates divide the gas space and the water storage space into a first gas chamber, a second gas chamber, a third gas chamber, a first water chamber, a second water chamber, and a third water chamber from top to bottom respectively. And every two gas chambers and water chambers at the same horizontal level from top to bottom respectively form a primary waste heat recovery space, a secondary waste heat recovery space, and a tertiary waste heat recovery space;

[0009] An adaptive adjustment mechanism, which includes a water stirring frame and a gas stirring frame for stirring water and flue gas, and the water stirring frame and the gas stirring frame stir circularly and turn up and down;

[0010] A flue gas detection mechanism, which is used to detect the flue gas volume and temperature during each primary treatment;

[0011] A flue gas and water supplementary transmission mechanism, which is used to transmit the flue gas downward step by step and supplement water according to the flue gas detection mechanism.

[0012] Preferably, the adaptive adjustment mechanism includes a support seat fixedly connected to the bottom end of the waste heat recovery cylinder. A plurality of first support plates arranged in a linear array are fixedly connected to the outer wall of the waste heat recovery cylinder. The support seat and the first support plates correspond to the tertiary waste heat recovery space. Between every two adjacent first support plates from bottom to top respectively correspond to the secondary waste heat recovery space and the tertiary waste heat recovery space. Motors are fixedly connected to the tops of the support seat and the first support plates. The output ends of the motors are fixedly connected with rotating shafts, and the other ends of each rotating shaft are rotatably connected to the bottom end of the first support plate above itself.

[0013] Preferably, sliding grooves are opened on the outer walls of the rotating shafts. Sliders are fixedly connected to the inner walls of the sliding grooves. Gears are fixedly connected to the outer walls of the sliders, and the gears are slidably connected to the outer walls of the rotating shafts. A plurality of first moving grooves arranged vertically are opened on the outer wall of the waste heat recovery cylinder. First moving blocks are slidably connected to the inner walls of the first moving grooves. A plurality of toothed rings are rotatably connected to the outer walls of the first moving blocks. The toothed rings are engaged with the gears. Ring-shaped rotating grooves are opened at the bottoms of the toothed rings and the gears. Rotating heads are rotatably connected to the inner walls of the ring-shaped rotating grooves, and connecting plates are rotatably connected to the bottoms of the rotating heads.

[0014] Preferably, the water stirring frame includes a first rotating ring in contact with the inner wall of the waste heat recovery cylinder, and first permanent magnetic rings are embedded in the outer peripheral wall of the first rotating ring and the inner peripheral wall of the toothed ring, and the two first permanent magnetic rings attract each other magnetically. A plurality of second moving grooves corresponding to the first moving grooves are formed in the outer peripheral wall of the heat conducting layer. A second moving block is slidably connected to the inner wall of the second moving groove. A second rotating ring is rotatably connected to the outer wall of the second moving block, and a plurality of first connecting blocks arranged in a circumferential array are fixedly connected between the second rotating ring and the first rotating ring.

[0015] Preferably, threaded rods are vertically rotatably connected to the interiors of the first air chamber, the second air chamber, and the third air chamber. Threaded sleeves are sleeved on the outer walls of the threaded rods. The air stirring frame includes second connecting blocks arranged in a circumferential array on the outer peripheral wall of the threaded sleeve. A lifting plate is fixedly connected to the bottom end of the second connecting block. The other ends of the second connecting blocks are fixedly connected together to form a third rotating ring. Second permanent magnetic rings that attract each other magnetically are embedded in the outer peripheral wall of the third rotating ring and the inner peripheral wall of the second rotating ring.

[0016] Sockets are formed at the top ends of the partition plates. Circular holes are formed at the bottom ends of the threaded rods. An electromagnetic plate is fixedly connected to the inner top wall of the circular hole. A plastic spring is fixedly connected to the bottom end of the electromagnetic plate. The other end of the plastic spring is fixedly connected to a magnetic insertion block. The magnetic insertion block repels the electromagnetic plate magnetically, and the magnetic insertion block is intermittently inserted into the circular hole.

[0017] Preferably, the flue gas detection mechanism includes pressing plates slidably connected to the inner walls of the first air chamber, the second air chamber, and the third air chamber respectively. A threaded ring is fixedly connected to the inner peripheral wall of the pressing plate, and the threaded ring is sleeved on the outer wall of the threaded rod. Detection springs are fixedly connected between the inner top walls of the first air chamber, the second air chamber, and the third air chamber and the top ends of the pressing plates respectively. An air outlet is formed in the inner top wall of the waste heat recovery cylinder. A detection tube is fixedly connected to the top end of the waste heat recovery cylinder. A vertical block is fixedly connected to the top end of the detection tube. A connecting rod is fixedly connected between the two vertical blocks. A detection rod is rotatably connected to the bottom end of the connecting rod. A wind wheel is fixedly connected to the bottom end of the detection rod. An N-pole magnetic plate and an S-pole magnetic plate are fixedly arranged up and down on the inner wall of one of the vertical blocks. A conductive rod is fixedly connected to the outer wall of the detection rod, and the conductive rod is located between the horizontal planes of the N-pole magnetic plate and the S-pole magnetic plate. Temperature detectors are arranged inside the first air chamber, the second air chamber, and the third air chamber respectively. The conductive rod is electrically connected to a current detector. The current detector is electrically connected to a PLC controller. The PLC controller is electrically connected to the motor, the electromagnetic plate, and the temperature detector to form a control loop.

[0018] Preferably, the flue gas and water replenishment transmission mechanism includes two second support plates fixedly connected to the outer wall of the waste heat recovery cylinder and arranged up and down. The top ends of the second support plates are fixedly connected with air pumps. The air delivery ends of the air pumps located above pass through the inner wall and the heat conduction layer of the waste heat recovery cylinder and extend into the first air cavity. The air extraction ends of the air pumps located below pass through the inner wall and the heat conduction layer of the waste heat recovery cylinder and extend into the third air cavity;

[0019] A plurality of third support plates are fixedly connected to the outer wall of the waste heat recovery cylinder and arranged up and down. The top ends of the third support plates are fixedly connected with air pumps. The air extraction ends of the air pumps from top to bottom pass through the inner wall of the waste heat recovery cylinder and extend into the first air cavity, the second air cavity, and the third air cavity respectively. The output ends of the plurality of air pumps are fixedly communicated with connecting pipes, and the other ends of the connecting pipes are fixedly communicated with a collecting pipe together.

[0020] Preferably, a plurality of fourth support plates are fixedly connected to the outer wall of the waste heat recovery cylinder and arranged up and down. The top ends of the two fourth support plates located in the upper part are fixedly connected with transfer pumps. The air extraction ends of the two transfer pumps from top to bottom are respectively communicated with the first air cavity and the second air cavity. The air exhaust ends of the two transfer pumps from top to bottom are respectively communicated with the second air cavity and the third air cavity;

[0021] The top ends of the plurality of fourth support plates are fixedly connected with water extraction pumps. The water drainage ends of the water extraction pumps from top to bottom are respectively communicated with the first water cavity, the second water cavity, and the third water cavity. The PLC controller is electrically connected to the air pumps, the air pumps, the transfer pumps, and the water extraction pumps to form a transmission loop.

[0022] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art:

[0023] 1. By dividing the gas space and the water storage space in the waste heat recovery cylinder into multiple air cavities, namely the first air cavity, the second air cavity, and the third air cavity, and water cavities, namely the first water cavity, the second water cavity, and the third water cavity respectively, during the process of the flue gas being transmitted downward step by step, the heat is absorbed step by step, ensuring that the heat in the flue gas is fully recovered, fully recovering the high, medium, and low temperature heat in the flue gas, and avoiding the problem of insufficient heat utilization in single-stage recovery.

[0024] 2. Detect the quantity and temperature of the flue gas through a flue gas detection agency. The PLC controller controls the water pump to inject an appropriate amount of water into each water chamber (the first water chamber, the second water chamber, and the third water chamber) according to the detection results, ensuring that the water quantity matches the flue gas quantity and temperature. Drive the water stirring frame and the air stirring frame through the motor. The PLC controller adjusts the rotation speed of the motor according to the flue gas quantity and temperature, and then adjusts the stirring speed of the water stirring frame and the air stirring frame to ensure that the flue gas is in full contact with the water, improving the heat exchange efficiency. Drive the rotating shaft through the motor to drive the gear and the toothed ring to rotate, and then drive the water stirring frame and the air stirring frame to perform circular stirring. Through the cooperation of the electromagnetic plate and the threaded rod, the air stirring frame moves up and down on the threaded rod, driving the water stirring frame to move up and down synchronously to achieve up and down stirring, enabling the flue gas to be in full contact with the water, improving the heat exchange effect, avoiding excessive or too low local water temperature, and ensuring uniform heat transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Schematic three-dimensional structure of the present invention Figure I ;

[0027] Figure 2 Schematic three-dimensional structure of the present invention Figure II ;

[0028] Figure 3 Schematic cross-sectional three-dimensional structure diagram of the present invention;

[0029] Figure 4 Schematic three-dimensional structure diagram of the flue gas detection agency of the present invention;

[0030] Figure 5 Schematic cross-sectional three-dimensional structure diagram of the threaded rod of the present invention;

[0031] Figure 6 Schematic partial three-dimensional structure diagram of the present invention;

[0032] Figure 7 Schematic three-dimensional structure diagram of the air stirring frame of the present invention.

[0033] Reference Numerals: 1, waste heat recovery cylinder; 2, heat conduction layer; 3, adaptive adjustment mechanism; 31, water stirring frame; 311a, first rotating ring; 312a, first connecting block; 313a, second moving groove; 314a, second moving block; 315a, second rotating ring; 32, gas stirring frame; 321a, second connecting block; 322a, lifting plate; 323, third rotating ring; 33, support seat; 34, first support plate; 35, motor; 36, rotating shaft; 37, sliding groove; 38, slider; 39, gear; 310, first moving groove; 311b, first moving block; 312b, toothed ring; 313b, annular rotating groove; 314b, rotating head; 315b, connecting plate; 316, threaded rod; 317, threaded sleeve; 318, jack; 319, round hole; 320, electromagnetic plate; 321b, plastic spring; 322b, magnetic insertion block; 4, flue gas detection mechanism; 41, extrusion plate; 42, detection spring; 43, air outlet; 44, detection tube; 45, vertical block; 46, connecting rod; 47, detection rod; 48, wind wheel; 49, N-pole magnetic plate; 410, S-pole magnetic plate; 411, conductive rod; 5, flue gas and water replenishment and transmission mechanism; 51, second support plate; 52, air pump; 53, third support plate; 54, gas pump; 55, connecting pipe; 56, gas collecting pipe; 57, fourth support plate; 58, transmission pump; 59, water pumping pump; 510, gas space; 511, water storage space; 512, partition plate; 513, first air chamber; 514, second air chamber; 515, third air chamber; 516, first water chamber; 517, second water chamber; 518, third water chamber. Detailed Embodiment

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention will be further described below with reference to the embodiments.

[0036] Embodiment: Refer to Figures 1 to 7 , the waste heat recovery device for the calciner of preparing zeolite from blast furnace slag water, comprising:

[0037] Waste heat recovery cylinder 1, with a heat conduction layer 2 arranged inside the waste heat recovery cylinder 1. The heat conduction layer 2 divides the waste heat recovery cylinder 1 from the inside to the outside into a gas space 510 and a water storage space 511. The waste heat recovery cylinder 1 is provided with a plurality of partition plates 512 from top to bottom. The partition plates 512 divide the gas space 510 and the water storage space 511 into a first gas chamber 513, a second gas chamber 514, a third gas chamber 515, a first water chamber 516, a second water chamber 517, and a third water chamber 518 from top to bottom respectively. And every two horizontally-aligned gas chambers and water chambers form a primary waste heat recovery space, a secondary waste heat recovery space, and a tertiary waste heat recovery space from top to bottom respectively;

[0038] An adaptive adjustment mechanism 3, the adaptive adjustment mechanism 3 includes a water stirring frame 31 and a gas stirring frame 32 for stirring water and flue gas, and the water stirring frame 31 and the gas stirring frame 32 perform circular stirring and up-and-down turning;

[0039] The adaptive adjustment mechanism 3 includes a support base 33 fixedly connected to the bottom end of the waste heat recovery cylinder 1. A plurality of first support plates 34 arranged in a linear array are fixedly connected to the outer wall of the waste heat recovery cylinder 1. The support base 33 and the first support plates 34 correspond to the tertiary waste heat recovery space. Every two adjacent first support plates 34 from bottom to top respectively correspond to the secondary waste heat recovery space and the tertiary waste heat recovery space. Motors 35 are fixedly connected to the tops of the support base 33 and the first support plates 34. Output shafts of the motors 35 are fixedly connected with rotating shafts 36. And the other end of each rotating shaft 36 is rotatably connected to the bottom end of the first support plate 34 above it.

[0040] Sliding grooves 37 are formed on the outer walls of the rotating shafts 36. Sliders 38 are fixedly connected to the inner walls of the sliding grooves 37. Gears 39 are fixedly connected to the outer walls of the sliders 38. And the gears 39 are slidably connected to the outer walls of the rotating shafts 36. A plurality of first moving grooves 310 arranged in an up-and-down array are formed on the outer wall of the waste heat recovery cylinder 1. First moving blocks 311b are slidably connected to the inner walls of the first moving grooves 310. A plurality of tooth rings 312b are rotatably connected to the outer walls of the first moving blocks 311b. The tooth rings 312b are meshed with the gears 39. Annular rotating grooves 313b are formed at the bottoms of the tooth rings 312b and the gears 39. Rotating heads 314b are rotatably connected to the inner walls of the annular rotating grooves 313b. And the bottoms of the rotating heads 314b are rotatably connected to connecting plates 315b. The rotating heads 314b will not fall off within the annular rotating grooves 313b. The tops or bottoms of the rotating heads 314b may be designed with structures such as bosses, snap rings, or retaining rings, etc. These structures cooperate with the upper and lower end faces of the annular rotating grooves 313b to limit the axial movement range of the rotating heads 314b, so that they can only rotate within the annular rotating grooves 313b and will not fall off.

[0041] The water stirring frame 31 includes a first rotating ring 311a in contact with the inner wall of the waste heat recovery cylinder 1. The outer peripheral walls of the first rotating ring 311a and the inner peripheral wall of the toothed ring 312b are both embedded with first permanent magnetic rings, and the two first permanent magnetic rings attract each other magnetically. A plurality of second moving grooves 313a corresponding to the first moving grooves 310 are formed in the outer peripheral wall of the heat conducting layer 2. A second moving block 314a is slidably connected to the inner wall of the second moving groove 313a. The outer wall of the second moving block 314a is rotatably connected to a second rotating ring 315a, and a plurality of first connecting blocks 312a arranged in a circumferential array are fixedly connected between the second rotating ring 315a and the first rotating ring 311a.

[0042] A threaded rod 316 is vertically rotatably connected to the interiors of the first air chamber 513, the second air chamber 514, and the third air chamber 515. A threaded sleeve 317 is sleeved on the outer wall of the threaded rod 316. The air stirring frame 32 includes second connecting blocks 321a arranged in a circumferential array on the outer peripheral wall of the threaded sleeve 317. The bottom ends of the second connecting blocks 321a are fixedly connected to a lifting plate 322a. The other ends of the second connecting blocks 321a are fixedly connected to a third rotating ring 323 together. The outer peripheral walls of the third rotating ring 323 and the inner peripheral wall of the second rotating ring 315a are both embedded with second permanent magnetic rings that attract each other magnetically;

[0043] Insertion holes 318 are formed at the top ends of the partition plates 512. A round hole 319 is provided at the bottom end of the threaded rod 316. An electromagnetic plate 320 is fixedly connected to the inner top wall of the round hole 319. A plastic spring 321b is fixedly connected to the bottom end of the electromagnetic plate 320. The other end of the plastic spring 321b is fixedly connected to a magnetic insertion block 322b. The magnetic insertion block 322b repels the electromagnetic plate 320 magnetically, and the magnetic insertion block 322b is intermittently inserted into the round hole 319.

[0044] The flue gas detection mechanism 4 is used to detect the flue gas volume and temperature during each primary treatment;

[0045] The flue gas detection mechanism 4 includes pressing plates 41 slidably connected to the inner walls of the first air chamber 513, the second air chamber 514, and the third air chamber 515 respectively. A threaded ring is fixedly connected to the inner peripheral wall of the pressing plate 41, and the threaded ring is threadedly sleeved on the outer wall of the threaded rod 316 (through the threaded ring, when the pressing plate moves upward, the threaded ring moves threadedly with the outer wall of the threaded rod 316, and the threaded ring rotates within the pressing plate. Therefore, the pressing plate 41 can move upward normally, and the above three are all hermetically connected to prevent the discharge of flue gas). The inner top walls of the first air chamber 513, the second air chamber 514, and the third air chamber 515 are all fixedly connected to the top ends of the pressing plates 41 with detection springs 42. An air outlet 43 is provided on the inner top wall of the waste heat recovery cylinder 1. The top end of the waste heat recovery cylinder 1 is fixedly connected to a detection tube 44. The top end of the detection tube 44 is fixedly connected to a vertical block 45. A connecting rod 46 is fixedly connected between the two vertical blocks 45. The bottom end of the connecting rod 46 is rotatably connected to a detection rod 47. The bottom end of the detection rod 47 is fixedly connected to a wind wheel 48. N-pole magnetic plates 49 and S-pole magnetic plates 410 are fixedly arranged up and down on the inner wall of one of the vertical blocks 45. A conductive rod 411 is fixedly connected to the outer wall of the detection rod 47, and the conductive rod 411 is located between the horizontal planes of the N-pole magnetic plate 49 and the S-pole magnetic plate 410. Temperature detectors are arranged inside the first air chamber 513, the second air chamber 514, and the third air chamber 515. The conductive rod 411 is electrically connected to a current detector, and the current detector is electrically connected to a PLC controller. The PLC controller is electrically connected to the motor 35, the electromagnetic plate 320, and the temperature detector and forms a control loop.

[0046] The flue gas and water supplementary transmission mechanism 5 is used to transmit the flue gas downward step by step and supplement water according to the flue gas detection mechanism 4.

[0047] The flue gas and water supplementary transmission mechanism 5 includes two second support plates 51 fixedly connected to the outer wall of the waste heat recovery cylinder 1 and arranged up and down. The top ends of the second support plates 51 are both fixedly connected to air pumps 52. The air delivery end of the air pump 52 located above passes through the inner wall of the waste heat recovery cylinder 1, the heat conduction layer 2, and extends into the first air chamber 513. The air extraction end of the air pump 52 located below passes through the inner wall of the waste heat recovery cylinder 1, the heat conduction layer 2, and extends into the third air chamber 515;

[0048] A plurality of third support plates 53 are fixedly connected to the outer wall of the waste heat recovery cylinder 1 and arranged up and down. The top ends of the third support plates 53 are all fixedly connected to air pumps 54. The air extraction ends of the air pumps 54 from top to bottom all pass through the inner wall of the waste heat recovery cylinder 1 and extend into the first air chamber 513, the second air chamber 514, and the third air chamber 515 respectively. The output ends of the plurality of air pumps 54 are all fixedly communicated with a connecting pipe 55. The other ends of the connecting pipes 55 are fixedly communicated with a collecting pipe 56 together. The air outlet of the collecting pipe 56 can be connected to various waste heat utilization devices, such as heat exchangers and heat pumps.

[0049] A plurality of vertically arranged fourth support plates 57 are fixedly connected to the outer wall of the waste heat recovery cylinder 1. The tops of the two upper fourth support plates 57 are fixedly connected with a transfer pump 58. The air suction ends of the two transfer pumps 58 from top to bottom are respectively communicated with the first air chamber 513 and the second air chamber 514, and the air discharge ends of the two transfer pumps 58 from top to bottom are respectively communicated with the second air chamber 514 and the third air chamber 515;

[0050] The tops of a plurality of fourth support plates 57 are all fixedly connected with a water extraction pump 59. The water discharge ends of the water extraction pumps 59 from top to bottom are respectively communicated with the first water chamber 516, the second water chamber 517, and the third water chamber 518. The PLC controller is electrically connected to the air pump 52, the air pump 54, the transfer pump 58, and the water extraction pump 59 to form a transfer loop.

[0051] All the above-mentioned magnetic components adopt high-temperature magnetic materials. For example, samarium cobalt magnets are divided into two types: SmCo5 and Sm2Co17. SmCo5 has a relatively high remanence and coercivity. The remanence generally reaches 0.9 - 1.1T, and the coercivity is between 700 - 900 kA / m; the Sm2Co17 type has a higher magnetic energy product, up to 200 - 250 kJ / m3, and can maintain good magnetic stability at high temperatures. In the waste heat recovery device of the calciner for preparing zeolite from blast furnace slag, samarium cobalt magnets can ensure that in a high-temperature environment of 1100 °C, all magnetic components (such as the first permanent magnet ring, the second permanent magnet ring, the electromagnetic plate 320, etc.) work normally, maintaining the adaptive adjustment function and heat exchange efficiency of the device.

[0052] The working principle of the present invention is as follows:

[0053] First, the flue gas generated by the calciner is discharged into the first air chamber 513 through the upper air pump 52. Then, the clear water introduced into the first water chamber 516 is controlled according to the temperature and volume of the flue gas. Subsequently, the motor 35 is started, and the rotating shaft 36 is driven to rotate by the motor 35, thereby driving the gear 39 to rotate. The gear 39 drives the toothed ring 312b to rotate. Since the outer peripheral wall of the first rotating ring 311a and the inner peripheral wall of the toothed ring 312b are both embedded with first permanent magnet rings, and the two first permanent magnet rings attract each other magnetically, the first rotating ring 311a drives the toothed ring 312b to rotate synchronously, thereby driving the water stirring frame 31 to rotate. The clear water is stirred by the water stirring frame 31. Since the outer peripheral wall of the third rotating ring 323 and the inner peripheral wall of the second rotating ring 315a are both embedded with second permanent magnet rings that attract each other magnetically, the air stirring frame 32 is driven to stir the flue gas circumferentially;

[0054] And when the flue gas is stirred circumferentially, the electromagnetic plate 320 is energized regularly by the PLC controller and the motor 35 is controlled to reverse regularly (the regular time of the electromagnetic plate 320 is the time for the gas stirring frame 32 to move from the bottom end of the threaded rod 316 to the top end of the threaded rod 316 through pre-testing. The reverse time of the motor 35 is the energizing time of the electromagnetic plate 320. When the electromagnetic plate 320 is de-energized, the motor 35 will not reverse). By energizing the electromagnetic plate 320, the magnetic insert block 322b moves downward. As the gas stirring frame 32 drives the threaded rod 316 to rotate, the magnetic insert block 322b will gradually insert into the jack 318. Through the limitation of the insert block by the jack 318, the threaded rod 316 is limited. By the rotation of the gas stirring frame 32 on the outer wall of the threaded rod 316, the gas stirring frame 32 moves up and down (referring to the relationship between the screw and the nut), so that the gas stirring frame 32 and the water stirring frame 31 move up and down synchronously, and then the water and the flue gas are stirred up and down, so as to achieve the effect of up-and-down stirring and circumferential stirring.

[0055] When the flue gas is discharged into the first gas chamber 513, the flue gas will push the extrusion plate 41 upward. Through the extrusion plate 41, the air on the extrusion plate 41 is discharged through the air outlet 43. The air is extruded through the air outlet 43, and the air blows the wind wheel 48 to rotate. By the rotation of the wind wheel 48, the detection rod 47 can be driven to rotate. By the rotation of the detection rod 47, the conductive rod 411 is driven to rotate, and then the magnetic induction lines between the N-pole magnetic plate 49 and the S-pole magnetic plate 410 are cut, so as to generate an electric current (the principle of cutting magnetic induction lines). Then the magnitude of the generated current is detected by the current detector (since there is a certain space between the extrusion plate 41 and the inner bottom of the first gas chamber 513 in the initial state, but the gas storage capacity of this space is known through pre-testing). Then the electrical signal for detecting the current magnitude is transmitted to the PLC controller, and the temperature of the flue gas is detected by the temperature detector.

[0056] Then, the water injection volume into each water chamber is controlled according to the flue gas volume and the flue gas temperature, and the stirring speeds of the water stirring frame 31 and the gas stirring frame 32 are controlled. Specifically as follows:

[0057] During the process of preparing zeolite from blast furnace slag, the operating conditions of the calciner are different, and the flue gas temperature and volume will vary. Taking the common blast furnace production scale as an example, under normal production load, the flue gas temperature discharged from the calciner is generally between 700-900°C, and the flue gas volume is about 3000-5000 cubic meters per hour. When the blast furnace is in high-load production, such as when the ore processing volume increases by 20%, the flue gas temperature discharged from the calciner may rise to 900-1100°C at this time, and the flue gas volume will correspondingly increase to 5000-7000 cubic meters per hour; while in the low-load production stage, such as just after starting up after equipment maintenance or insufficient ore supply, the flue gas temperature will drop to 500-700°C, and the flue gas volume will also decrease to 1500-3000 cubic meters per hour. These data are statistically obtained based on the monitoring data in the actual blast furnace production process. Due to equipment differences and different production processes in different blast furnaces, the data will fluctuate.

[0058] When the flue gas volume is large and the temperature is low, a larger amount of water is required because, although the temperature is low, the total heat is still high due to the large flue gas volume, and sufficient water is needed to absorb the heat. According to the heat exchange principle and actual tests, the initial amount of water injected into each water chamber can be set to 10-12 cubic meters per hour, and it is evenly distributed to each water chamber. For the stirring speed of the water stirring frame 31, the rotation speed of the motor 35 can be set to 1200-1400 revolutions per minute to improve the heat transfer efficiency by increasing the fluidity of the water and avoid the overall recovery effect being affected by too low local water temperature. The stirring speed of the gas stirring frame 32 for the flue gas remains at a normal level, and the motor 35 drives its rotation speed to 1000-1200 revolutions per minute to ensure sufficient contact between the flue gas and water;

[0059] When the flue gas volume is large and the temperature is high, a larger amount of water is required because the total heat is high due to the large flue gas volume and high temperature, and more water is needed to absorb the heat. Therefore, the amount of water injected into the corresponding water chamber according to the position of the specific gas chamber can be increased to 15-18 cubic meters per hour. To ensure sufficient contact between the high-temperature flue gas and water and rapid heat transfer, the stirring speeds of both the water stirring frame 31 and the gas stirring frame 32 should be increased. The rotation speed of the motor 35 driving the water stirring frame 31 is increased to 1400-1600 revolutions per minute, and the rotation speed of the gas stirring frame 32 is also increased to 1200-1400 revolutions per minute;

[0060] When the flue gas volume is small and the temperature is low, a smaller amount of water is required because the total heat is relatively low due to the small flue gas volume and low temperature, and too much water will cause the water temperature to rise insignificantly. Therefore, the amount of water injected into the corresponding water chamber according to the position of the specific gas chamber can be reduced to 3-5 cubic meters per hour. To avoid excessive dilution, the stirring speed of the gas stirring frame 32 for the flue gas should be reduced, and the motor 35 drives its rotation speed to 600-800 revolutions per minute. The stirring speed of the water stirring frame 31 is also correspondingly reduced, and the motor 35 drives its rotation speed to 800-1000 revolutions per minute to maintain appropriate heat transfer;

[0061] When the flue gas volume is small and the temperature is high, normal water volume is required. The flue gas volume is small but the temperature is high, and the total heat is moderate. Too much or too little water volume will affect the efficiency. The water volume injected into the corresponding water cavity according to the position of the specific gas cavity can be controlled at 6-8 cubic meters per hour. The stirring speeds of the gas stirring frame 32 and the water stirring frame 31 both maintain normal speeds. The motor 35 drives the gas stirring frame 32 to rotate at a speed of 1000-1200 revolutions per minute, and drives the water stirring frame 31 to rotate at a speed of 1200-1400 revolutions per minute, ensuring full contact between the high-temperature flue gas and water and balancing heat transfer and energy consumption.

[0062] The process of discharging clear water into the first water cavity 516, the second water cavity 517, and the third water cavity 518 is as follows. The water pump 59 is started through the PLC controller, and water is injected into the first water cavity 516, the second water cavity 517, and the third water cavity 518 respectively through the water pump 59. After the flue gas volume detected in the first gas cavity 513 during the first injection, the flue gas volumes in the subsequent second gas cavity 514 and third gas cavity 515 are the same. Only the flue gas temperature needs to be detected, and the water injection volumes into the second water cavity 517 and the third water cavity 518 are controlled according to the flue gas temperature. The time for waste heat recovery in each cavity is 10 minutes (every 10 minutes is the time that has been pre-tested for the highest temperature of the flue gas discharged from the calciner and can be processed within 30 minutes);

[0063] After the flue gas is processed in the second gas cavity 514 for 10 minutes, the flue gas in the third gas cavity 515 is pumped out through the air pump 52 and discharged into the flue gas processor. Then, the flue gas in the second gas cavity 514 is discharged into the third gas cavity 515 through the transfer pump 58, the flue gas in the first gas cavity 513 is discharged into the second gas cavity 514, and the unprocessed flue gas is discharged into the first gas cavity 513, with continuous waste heat recovery.

[0064] The heating of water by the flue gas will cause water to generate water vapor. The water vapor in the first water cavity 516, the second water cavity 517, and the third water cavity 518 is pumped out through multiple air pumps 54 respectively, and then discharged through the gas collecting pipe 56 to recover and utilize the waste heat. And every time the flue gas enters a new gas cavity, the water in the water cavity will be pumped out and then new water will be discharged again. The reason is to ensure the accuracy of the water volume discharged into the water cavity each time.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. The waste heat recovery device for the calciner of preparing zeolite from blast furnace slag is characterized in that, Including: A waste heat recovery cylinder (1), inside which a heat conduction layer (2) is provided. The heat conduction layer (2) divides the waste heat recovery cylinder (1) from the inside out into a gas space (510) and a water storage space (511). The waste heat recovery cylinder (1) is provided with a plurality of partition plates (512) from top to bottom. The partition plates (512) divide the gas space (510) and the water storage space (511) into a first gas chamber (513), a second gas chamber (514), a third gas chamber (515), a first water chamber (516), a second water chamber (517), and a third water chamber (518) from top to bottom respectively. And every two gas chambers and water chambers at the same horizontal level form a primary waste heat recovery space, a secondary waste heat recovery space, and a tertiary waste heat recovery space from top to bottom respectively; An adaptive adjustment mechanism (3), which includes a water stirring frame (31) and a gas stirring frame (32) for stirring water and flue gas. The water stirring frame (31) and the gas stirring frame (32) stir circularly and turn up and down; A plurality of first moving grooves (310) are arranged in an up-and-down array on the outer wall of the waste heat recovery cylinder (1). A plurality of second moving grooves (313a) corresponding to the first moving grooves (310) are provided on the outer peripheral wall of the heat conduction layer (2). A second moving block (314a) is slidably connected to the inner wall of the second moving groove (313a). A second rotating ring (315a) is rotatably connected to the outer wall of the second moving block (314a). And a plurality of first connecting blocks (312a) arranged in a circular array are fixedly connected between the second rotating ring (315a) and the first rotating ring (311a); Vertical rotating rods (316) are rotatably connected inside the first gas chamber (513), the second gas chamber (514), and the third gas chamber (515). A thread sleeve (317) is threadedly sleeved on the outer wall of the threaded rod (316). The gas stirring frame (32) includes second connecting blocks (321a) arranged in a circular array on the outer peripheral wall of the thread sleeve (317). The bottom ends of the second connecting blocks (321a) are fixedly connected with lifting plates (322a). The other ends of the second connecting blocks (321a) are fixedly connected together with a third rotating ring (323). Second permanent magnets with mutually attracting magnetic properties are embedded on the outer peripheral wall of the third rotating ring (323) and the inner peripheral wall of the second rotating ring (315a); Jacks (318) are provided at the tops of the partition plates (512). Circular holes (319) are provided at the bottom ends of the threaded rods (316). An electromagnetic plate (320) is fixedly connected to the inner top wall of the circular hole (319). A plastic spring (321b) is fixedly connected to the bottom end of the electromagnetic plate (320). The other end of the plastic spring (321b) is fixedly connected with a magnetic insertion block (322b). The magnetic insertion block (322b) and the electromagnetic plate (320) are magnetically repulsive, and the magnetic insertion block (322b) is intermittently inserted into the circular hole (319); A flue gas detection mechanism (4) for detecting the flue gas volume and temperature during each primary treatment; The flue gas and water replenishment transmission mechanism (5) is used to transmit the flue gas downward step by step and replenish water according to the flue gas detection mechanism (4).

2. The waste heat recovery device for calcining furnace of preparing zeolite from blast furnace slag according to claim 1, characterized in that, The adaptive adjustment mechanism (3) includes a support base (33) fixedly connected to the bottom end of the waste heat recovery cylinder (1). A plurality of first support plates (34) arranged in a linear array are fixedly connected to the outer wall of the waste heat recovery cylinder (1). There are corresponding three - level waste heat recovery spaces between the support base (33) and the first support plates (34). Between every two adjacent first support plates (34) from bottom to top, there are corresponding second - level and third - level waste heat recovery spaces respectively. Motors (35) are fixedly connected to the tops of both the support base (33) and the first support plates (34). The output ends of the motors (35) are fixedly connected with rotating shafts (36), and the other ends of each rotating shaft (36) are rotatably connected to the bottom ends of the first support plates (34) above themselves.

3. The waste heat recovery device for calcining furnace of preparing zeolite from blast furnace slag according to claim 2, characterized in that, Sliding grooves (37) are formed in the outer walls of the rotating shafts (36). Sliders (38) are fixedly connected to the inner walls of the sliding grooves (37). Gears (39) are fixedly connected to the outer walls of the sliders (38), and the gears (39) are slidably connected to the outer walls of the rotating shafts (36). A first moving block (311b) is slidably connected to the inner wall of the first moving groove (310). A plurality of toothed rings (312b) are rotatably connected to the outer wall of the first moving block (311b). The toothed rings (312b) are meshed with the gears (39). Annular rotating grooves (313b) are formed at the bottoms of both the toothed rings (312b) and the gears (39). Rotating heads (314b) are rotatably connected to the inner walls of the annular rotating grooves (313b), and the bottom ends of the rotating heads (314b) are rotatably connected to connecting plates (315b).

4. The waste heat recovery device for the calciner of preparing zeolite from blast furnace slag according to claim 3, characterized in that, The water stirring frame (31) includes a first rotating ring (311a) in contact with the inner wall of the waste heat recovery cylinder (1). First permanent magnetic rings are embedded in the outer peripheral walls of the first rotating ring (311a) and the inner peripheral walls of the toothed rings (312b), and the two first permanent magnetic rings attract each other magnetically.

5. The waste heat recovery device for the calciner of preparing zeolite from blast furnace slag according to claim 1, characterized in that, The flue gas detection mechanism (4) includes a pressing plate (41) slidably connected to the inner walls of the first air chamber (513), the second air chamber (514), and the third air chamber (515) respectively. A threaded ring is fixedly connected to the inner peripheral wall of the pressing plate (41), and the threaded ring is threadedly sleeved on the outer wall of the threaded rod (316). Detection springs (42) are fixedly connected to the top ends of the pressing plate (41) and the inner top walls of the first air chamber (513), the second air chamber (514), and the third air chamber (515). An air outlet (43) is formed in the inner top wall of the waste heat recovery cylinder (1). A detection tube (44) is fixedly connected to the top of the waste heat recovery cylinder (1). A vertical block (45) is fixedly connected to the top of the detection tube (44). A connecting rod (46) is fixedly connected between the two vertical blocks (45). A detection rod (47) is rotatably connected to the bottom end of the connecting rod (46). A wind wheel (48) is fixedly connected to the bottom end of the detection rod (47). An N-pole magnetic plate (49) and an S-pole magnetic plate (410) are fixedly arranged up and down on the inner wall of one of the vertical blocks (45). A conductive rod (411) is fixedly connected to the outer wall of the detection rod (47), and the conductive rod (411) is located between the horizontal planes of the N-pole magnetic plate (49) and the S-pole magnetic plate (410). Temperature detectors are arranged inside the first air chamber (513), the second air chamber (514), and the third air chamber (515). The conductive rod (411) is electrically connected to a current detector. The current detector is electrically connected to a PLC controller. The PLC controller is electrically connected to the motor (35), the electromagnetic plate (320), and the temperature detector to form a control loop.

6. The waste heat recovery device for the calciner of preparing zeolite from blast furnace slag according to claim 5, characterized in that, The flue gas and water replenishment transmission mechanism (5) includes two second support plates (51) fixedly connected to the outer wall of the waste heat recovery cylinder (1) and arranged up and down. Air pumps (52) are fixedly connected to the top ends of the second support plates (51). The air delivery end of the air pump (52) located above passes through the inner wall of the waste heat recovery cylinder (1), the heat conduction layer (2) and extends into the first air chamber (513). The air suction end of the air pump (52) located below passes through the inner wall of the waste heat recovery cylinder (1), the heat conduction layer (2) and extends into the third air chamber (515). A plurality of third support plates (53) are fixedly connected to the outer wall of the waste heat recovery cylinder (1) and arranged up and down. Air pumps (54) are fixedly connected to the top ends of the third support plates (53). The air suction ends of the air pumps (54) from top to bottom pass through the inner wall of the waste heat recovery cylinder (1) and extend into the first air chamber (513), the second air chamber (514), and the third air chamber (515) respectively. The output ends of the plurality of air pumps (54) are fixedly communicated with a connecting pipe (55). The other ends of the connecting pipes (55) are fixedly communicated with a gas collecting pipe (56).

7. The waste heat recovery device for the calciner of preparing zeolite from blast furnace slag according to claim 6, characterized in that, A plurality of vertically arranged fourth support plates (57) are fixedly connected to the outer wall of the waste heat recovery cylinder (1). The tops of the two upper fourth support plates (57) are fixedly connected with a transfer pump (58). The air suction ends of the two transfer pumps (58) from top to bottom are respectively communicated with the first air chamber (513) and the second air chamber (514), and the air discharge ends of the two transfer pumps (58) from top to bottom are respectively communicated with the second air chamber (514) and the third air chamber (515). The tops of the plurality of fourth support plates (57) are all fixedly connected with a water pump (59). The water discharge ends of the water pumps (59) from top to bottom are respectively communicated with the first water chamber (516), the second water chamber (517), and the third water chamber (518). The PLC controller is electrically connected to the air pump (52), the air pump (54), the transfer pump (58), and the water pump (59) to form a transfer loop.

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