Waste heat recovery method for iron-making slag flushing water and dehumidification device for recovering waste heat

Abstract

The invention discloses a waste heat recovery method for iron-making slag flushing water and a dehumidification device for waste heat recovery, the device comprises a heating device, the center of the inner contour of the bottom end of the heating device is fixedly connected with a fixed seat, and one side of the bottom end of the heating device is penetrated and fixedly connected with an L-shaped feeding pipe; the center of the top end of the heating equipment is connected with a driving ring in a penetrating and limiting rotating mode, and a screening mechanism is arranged at the top end of the L-shaped feeding pipe. By arranging the steam assembly, circulating suction is conducted on the interior of the heating equipment through the steam assembly, so that a low-pressure environment needed by flash evaporation is met in the tank body, slag flushing water is rapidly boiled and vaporized, and water and impurities are separated; by arranging the centrifugal mechanism, the flash steam is subjected to secondary gas-liquid separation through the centrifugal mechanism, and liquid drops and solid particles carried in the steam are further reduced; meanwhile, slag flushing water is rotationally stirred to prevent slag deposition; and by arranging the dehumidification assembly, cyclic utilization of condensate water and heat energy is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, and in particular to a waste heat recovery method for ironmaking slag flushing water and a dehumidification device for recovering the waste heat. Background Art

[0002] Ironmaking slag water is a by-product produced during the blast furnace ironmaking process. During the blast furnace ironmaking process, high-temperature slag flows out through the slag mouth and enters the slag chute. Further in the slag chute, the water and slag are impacted and quenched into qualified water slag. Ironmaking slag water, as a low-temperature waste heat source, has the characteristics of stable temperature and large flow rate. The temperature of the slag water is about 85°C when it is discharged, and a certain amount of waste heat can be recovered.

[0003] After searching, the patent with patent number CN116121472B discloses a blast furnace slag flushing water waste heat recovery system, including a flash tank and an absorption tower; the flash tank includes: a tank body, which is independently fixed and has a cavity inside, and a circulation cavity is arranged at the bottom; a circulation outlet is arranged at the bottom of the circulation cavity, and a circulation inlet is arranged at the top, and the central axis of the circulation inlet is tangent to the circumference of the circulation cavity; a feed pipe is arranged at the bottom of the tank body, and one end is arranged outside the tank body, and the other end extends into the tank body, and the end extending into the tank body is higher than the circulation cavity; a steam pipe is arranged at the top of the tank body, and one end is arranged outside the tank body, and the other end extends into the tank body; a circulation pump is connected to the circulation outlet and the circulation inlet through a pipeline, and is used to drive the slag flushing water to circulate in the circulation cavity.

[0004] In this case, the water and impurities in the slag flushing water are separated by flash evaporation and the sprayed cold water is heated by steam, so that the heat of the slag flushing water can be recovered; at the same time, a circulation chamber is designed at the bottom of the tank body, and the liquid phase is continuously circulated by a circulation pump, so that the impurities in the liquid phase are stirred and will not settle; and the circulation inlet tangent to the circulation chamber can also ensure that the liquid phase maintains a fixed rotation direction when flowing.

[0005] However, this case lacks the initial solid-liquid separation step of the slag water. Direct flash evaporation of the slag water will result in the generated steam containing a small amount of non-condensable gases and impurities. At this time, the waste heat recovery scheme in which the steam is in direct contact with the cooling water may cause cooling water pollution and thus waste water resources. At the same time, the small amount of solid particles or impurities entrained in the steam are easy to adhere to the inner wall of the device, thereby affecting the working efficiency of the device. Summary of the invention

[0006] The purpose of the present invention is to provide a waste heat recovery method for ironmaking slag flushing water and a dehumidification device for recovering waste heat, which has the advantages of steam purification and heat energy circulation and solves the problems raised in the background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for recovering waste heat from ironmaking slag flushing water, comprising the following steps:

[0008] S1. Pretreatment and flash evaporation: The high-temperature slag-washing water is firstly subjected to preliminary solid-liquid separation by a screening mechanism to remove large particle impurities, and the pretreated slag-washing water is further introduced into the steam component, where a sudden pressure drop is used to vaporize part of the water to generate flash steam;

[0009] S2. Steam treatment: The steam generated by flash evaporation contains a certain amount of water vapor and a small amount of non-condensable gases and impurities. A centrifugal mechanism is used to preliminarily remove the droplets and solid particles in the steam; the separated steam is further introduced into the subsequent dehumidification component through a blower;

[0010] S3, diversion dehumidification: In the dehumidification process, the steam is first cooled by the cooler to condense part of the water vapor into liquid water and remove most of the moisture; the condensed water is then collected and processed for recycling; further, the dehumidified air is heated by the heater to prevent moisture from re-condensing and increase the dryness of the air. At this time, the dried air is further circulated into the steam component;

[0011] S4. Energy recovery and water resource utilization: The heat in the steam component and the dehumidification component is recovered through the circulator, thereby realizing the purpose of recovering and utilizing the waste heat of the ironmaking slag flushing water; the condensed water is further treated to meet the industrial water standards and reused in the ironmaking process or other links requiring water, realizing the recycling of water resources.

[0012] Preferably, a dehumidification device for recovering waste heat from iron-making slag water comprises a heating device that provides storage and reaction space for the iron-making slag water, a fixed seat is fixedly connected to the center of the inner contour of the bottom end of the heating device, an L-shaped feed pipe is penetrated and fixedly connected to one side of the bottom end of the heating device, a drive ring is penetrated and connected to the center of the top end of the heating device for limited rotation, and a screening mechanism for preliminary solid-liquid separation of the slag water is provided at the top end of the L-shaped feed pipe.

[0013] Preferably, the screening mechanism includes a collecting hopper, the bottom end of which is detachably mounted on the outer contour of the end of the L-shaped feed pipe away from the heating device, a fixing rod is fixedly connected to the inner contour of the top end of the collecting hopper, a threaded shaft is penetrated through the center of the fixing rod and connected for limited rotation, a knob is fixedly connected to the top end of the threaded shaft, a conical sieve plate is penetrated through and screwed on the outer contour of the middle section of the threaded shaft, and a steam component for adjusting the internal pressure of the heating device is provided on the inner contour of the drive ring.

[0014] Preferably, the ratio of the opening aperture at the bottom end of the collecting hopper to the opening aperture at the top end of the L-shaped feed pipe is one to one, and the ratio of the opening aperture at the bottom end of the conical sieve plate to the opening aperture at the top end of the L-shaped feed pipe is eight to ten.

[0015] Preferably, the steam component includes a reciprocating threaded column, the middle section of the reciprocating threaded column is threaded onto the inner contour of the driving ring, a connecting rod is penetrated and fixedly connected to the outer contour of the bottom end of the reciprocating threaded column, both ends of the connecting rod are fixedly connected to a supporting shaft, the bottom end of the support shaft is fixedly connected to a pressure reducing plate, the center of the top end of the pressure reducing plate is penetrated and rotatably connected to a cover plate via a pin shaft, and a centrifugal mechanism for secondary solid-liquid separation of flash steam is provided at the bottom of the internal space of the heating equipment.

[0016] Preferably, the centrifugal mechanism includes a pressure limiting plate, the center of the top end of the pressure limiting plate is penetrated and rotatably connected to a cover plate 2 through a pin shaft, the center of the bottom end of the pressure limiting plate is fixedly connected to a conical tube, the internal limiting sliding connection of the conical tube is connected to a limiting ball, the outer contour of the pressure limiting plate is penetrated and connected to a limiting transmission with a positioning shaft, the top end of the positioning shaft is penetrated and connected to the limiting transmission with the pressure reducing plate, the outer contour of the fixed seat is rotatably connected to a rotating ring, the outer contour of the rotating ring is fixedly connected to a stirring blade, and a dehumidification component for recovering waste heat from steam is arranged once the heating equipment is away from the collecting hopper.

[0017] Preferably, the reciprocating threaded column is driven by an external motor and fixedly connected to the output shaft of the motor. The size ratio of the pressure reducing plate, the pressure limiting plate and the inner contour of the heating device is one to one. There are multiple stirring blades and they are symmetrically distributed along the axis of the rotating ring. The bottom end of the positioning shaft is in contact with the outer contour of the stirring blade and is transmission connected.

[0018] Preferably, the dehumidification component includes a blower, the top end of the blower close to the heating device is penetrated by and fixedly connected with a guide pipe 1, the end of the guide pipe 1 away from the blower is penetrated by and fixedly connected to the heating device, the bottom end of the blower away from the heating device is penetrated by and fixedly connected with a guide pipe 2, the end of the guide pipe 2 away from the blower is penetrated by and fixedly connected with a cooler, the bottom end of the cooler is penetrated by and fixedly connected with a drain pipe, the top end of the cooler is penetrated by and fixedly connected with an exhaust pipe, the end of the cooler away from the blower is fixedly connected with a circulator, the end of the circulator away from the cooler is penetrated by and fixedly connected with a heat conduction pipe, the top end of the exhaust pipe is penetrated by and fixedly connected with a heater, the end of the heat conduction pipe away from the circulator is penetrated by and fixedly connected to the outer contour of the heater, the top end of the heater is penetrated by and fixedly connected with an air guide pipe, and the end of the air guide pipe away from the circulator is penetrated by and fixedly connected to the outer contour of the top of the heating device.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a steam component, which circulates and pumps the heating device through the steam component to make the tank body meet the low-pressure environment required for flash evaporation, so that the slag flushing water boils and vaporizes rapidly and separates the water and impurities.

[0021] 2. The present invention provides a centrifugal mechanism to perform secondary gas-liquid separation on the flash steam, thereby further reducing the droplets and solid particles entrained in the steam; at the same time, the slag flushing water is rotated and stirred to prevent slag deposition.

[0022] 3. The present invention provides a dehumidification component to perform secondary gas-liquid separation and waste heat recovery operations on steam, thereby realizing the recycling of condensed water and thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 It is a cross-sectional view of the main structure of the present invention;

[0025] Figure 3 It is a cross-sectional view of the heating device and the screening mechanism structure of the present invention;

[0026] Figure 4 It is an exploded schematic diagram of the heating device and the screening mechanism structure of the present invention;

[0027] Figure 5 It is a cross-sectional view of the steam component and the centrifugal mechanism structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the steam component and the centrifugal mechanism structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the dehumidification component of the present invention;

[0030] Figure 8 This is a cross-sectional view of the dehumidification component structure of the present invention;

[0031] Fig. 9 It is the overall workflow diagram of the present invention.

[0032] In the figure: 1. heating equipment; 11. fixing seat; 12. L-shaped feed pipe; 13. driving ring; 2. collecting hopper; 21. fixing rod; 22. threaded shaft; 23. knob; 24. conical screen plate; 3. reciprocating threaded column; 31. connecting rod; 32. supporting shaft; 33. pressure reducing plate; 34. cover plate 1; 4. pressure limiting plate; 41. cover plate 2; 42. conical tube; 43. limiting ball; 44. positioning shaft; 45. rotating ring; 46. stirring blade; 5. blower; 51. guide tube 1; 52. guide tube 2; 6. cooler; 61. drain pipe; 62. exhaust pipe; 7. circulator; 71. heat pipe; 72. heater; 73. air pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] See also Figures 1 to 9 The present invention provides a technical solution, a method for recovering waste heat from ironmaking slag flushing water, comprising the following steps:

[0036] S1. Pretreatment and flash evaporation: The high-temperature slag-washing water is firstly subjected to preliminary solid-liquid separation by a screening mechanism to remove large particle impurities, and the pretreated slag-washing water is further introduced into the steam component, where a sudden pressure drop is used to vaporize part of the water to generate flash steam;

[0037] S2, steam treatment: the steam generated by flash evaporation contains a certain amount of water vapor and a small amount of non-condensable gas and impurities. The centrifugal mechanism is used to preliminarily remove the droplets and solid particles in the steam; the separated steam is further introduced into the subsequent dehumidification component through the blower 5;

[0038] S3, dehumidification by diversion: In the dehumidification process, the steam is first cooled by the cooler 6, so that part of the water vapor is condensed into liquid water, and most of the water is removed; then the condensed water is collected and processed for recycling; further, the dehumidified air is heated by the heater 72 to prevent the moisture from re-condensing and improve the dryness of the air. At this time, the dried air is further circulated into the steam component;

[0039] S4. Energy recovery and water resource utilization: The heat in the steam component and the dehumidification component is recovered through the circulator 7, thereby realizing the purpose of recovering and utilizing the waste heat of the ironmaking slag flushing water; the condensed water is further treated to meet the industrial water standard and reused in the ironmaking process or other links requiring water, realizing the recycling of water resources.

[0040] Embodiment 2:

[0041] See also Figures 1 to 4 This embodiment further illustrates Example 1, a dehumidification device for recovering waste heat from iron-making slag water, applied to a waste heat recovery method for iron-making slag water as described in claim 1, characterized in that it includes a heating device 1 for providing storage and reaction space for iron-making slag water, a fixing seat 11 is fixedly connected to the center of the inner contour of the bottom end of the heating device 1, an L-shaped feed pipe 12 is penetrated and fixedly connected to one side of the bottom end of the heating device 1, a drive ring 13 is penetrated at the center of the top end of the heating device 1 and is limitedly rotatably connected, and a screening mechanism for preliminary solid-liquid separation of the slag water is provided at the top end of the L-shaped feed pipe 12.

[0042] The screening mechanism includes a collecting hopper 2, the bottom end of which is detachably mounted on the outer contour of an L-shaped feed pipe 12 away from the heating device 1, a fixing rod 21 is fixedly connected to the inner contour of the top end of the collecting hopper 2, a threaded shaft 22 is penetrated through the center of the fixing rod 21 and connected for limited rotation, a knob 23 is fixedly connected to the top end of the threaded shaft 22, a conical sieve plate 24 is penetrated and screwed on the outer contour of the middle section of the threaded shaft 22, and a steam component for adjusting the internal pressure of the heating device 1 is provided on the inner contour of the driving ring 13.

[0043] The ratio of the opening aperture at the bottom end of the collecting hopper 2 to the opening aperture at the top end of the L-shaped feed pipe 12 is one to one, and the ratio of the opening aperture at the bottom end of the conical screen plate 24 to the opening aperture at the top end of the L-shaped feed pipe 12 is eight to ten.

[0044] First, ironmaking slag flushing water is added into the interior of the heating equipment 1 through a screening mechanism. During this process, slag impurities contained in the slag flushing water accumulate on the inner surface of the collecting hopper 2, and the liquid enters the L-shaped feed pipe 12 through the gap between the bottom opening of the collecting hopper 2 and the bottom end of the fixing rod 21 and further flows into the bottom end of the internal space of the heating equipment 1.

[0045] After the screening process is completed, the operator removes the screening mechanism and can precisely adjust the screening aperture by turning the knob 23, thereby effectively classifying the slag according to size.

[0046] When the knob 23 is rotated, since the knob 23 is fixedly connected to the threaded shaft 22 and the threaded shaft 22 is threadedly connected to the conical sieve plate 24, and the threaded shaft 22 is connected to the fixed rod 21 in a limited rotational connection, that is, the knob 23 drives the threaded shaft 22 to rotate synchronously, and the rotation of the threaded shaft 22 further drives the conical sieve plate 24 to rise or fall in the vertical direction under the limiting action of the fixed rod 21.

[0047] At this time, the relative position direction between the bottom end of the conical sieve plate 24 and the bottom opening of the collecting hopper 2 in the vertical direction changes synchronously with the lifting and lowering of the conical sieve plate 24. Since the outer contour of the conical sieve plate 24 is set to be conical, that is, the size of the gap between the bottom end of the conical sieve plate 24 and the bottom opening of the collecting hopper 2 changes synchronously with the lifting and lowering of the conical sieve plate 24, so that the size of the slag that can pass through changes synchronously, and the slag that passes through further falls into the collecting container to achieve the purpose of effectively classifying the slag according to size.

[0048] Embodiment three:

[0049] See also Figure 5 to Figure 6 This embodiment further explains Example 2, the steam component includes a reciprocating threaded column 3, the middle section of the reciprocating threaded column 3 is screwed onto the inner contour of the driving ring 13, a connecting rod 31 is penetrated and fixedly connected to the outer contour of the bottom end of the reciprocating threaded column 3, both ends of the connecting rod 31 are fixedly connected to a support shaft 32, the bottom end of the support shaft 32 is fixedly connected to a pressure reducing plate 33, the center of the top end of the pressure reducing plate 33 is penetrated and rotatably connected to a cover plate 34 through a pin shaft, and a centrifugal mechanism for secondary solid-liquid separation of flash steam is provided at the bottom of the internal space of the heating device 1.

[0050] The centrifugal mechanism includes a pressure limiting plate 4, the center of the top end of the pressure limiting plate 4 is penetrated and rotatably connected to a cover plate 2 41 through a pin shaft, the center of the bottom end of the pressure limiting plate 4 is fixedly connected to a conical tube 42, the internal limiting sliding connection of the conical tube 42 is connected to a limiting ball 43, the outer contour of the pressure limiting plate 4 is penetrated and connected to a limiting transmission with a positioning shaft 44, the top end of the positioning shaft 44 is penetrated and connected to a pressure reducing plate 33 in a limiting transmission, the outer contour of the fixed seat 11 is rotatably connected to a rotating ring 45, and the outer contour of the rotating ring 45 is fixedly connected to a stirring blade 46, and the heating device 1 is provided with a dehumidification component for recovering waste heat from steam away from the collecting hopper 2.

[0051] The reciprocating threaded column 3 is driven by an external motor and fixedly connected to the output shaft of the motor. The size ratio of the pressure reducing plate 33, the pressure limiting plate 4 and the inner contour of the heating device 1 is one to one. The stirring blades 46 are provided in plurality and are symmetrically distributed along the axis of the rotating ring 45. The bottom end of the positioning shaft 44 is in contact with the outer contour of the stirring blade 46 and is transmission-connected.

[0052] When the sieved slag flushing water flows into the bottom end of the internal space of the heating equipment 1, the external motor is started and drives the reciprocating threaded column 3 to rotate. Since the middle section of the reciprocating threaded column 3 is provided with a reciprocating thread, that is, during the unidirectional rotation of the reciprocating threaded column 3, it is guided by the driving ring 13 so that the reciprocating threaded column 3 starts to rise and fall synchronously. The connecting rod 31, the support shaft 32 and the pressure reducing plate 33 are fixedly connected to have the same movement trajectory as the reciprocating threaded column 3.

[0053] Since the ratio of the sizes of the pressure reducing plate 33 , the pressure limiting plate 4 and the inner contour of the heating device 1 is one to one, the inner space of the heating device 1 is divided into three areas A, B and C from top to bottom by the pressure reducing plate 33 and the pressure limiting plate 4 .

[0054] In the process of the pressure reducing plate 33 rising and falling synchronously with the reciprocating threaded column 3, when the pressure reducing plate 33 descends, the air pressure between the pressure reducing plate 33 and the pressure limiting plate 4 gradually increases. At this time, the cover plate 1 34 is in an open state under the action of the air pressure, and the cover plate 2 41 is in a closed state. When the pressure reducing plate 33 rises, the air pressure between the pressure reducing plate 33 and the pressure limiting plate 4 gradually decreases. At this time, the cover plate 1 34 is in a closed state under the action of the air pressure, and the cover plate 2 41 is in an open state.

[0055] When the pressure reducing plate 33 rises, the gas flow in the three areas inside the heating device 1 changes as follows: the gas in area C flows into area B through the cover plate 2 41, and the gas in area A remains unchanged. When the pressure reducing plate 33 falls, the gas flow in the three areas inside the heating device 1 changes as follows: the gas in area B flows into area A through the cover plate 1 34, and the gas in area C remains unchanged. Thus, the purpose of reducing the pressure of area C by flash evaporation and steam diversion is achieved by reciprocating the lifting and lowering of the pressure reducing plate 33.

[0056] When the air pressure in the C area drops to a predetermined value, due to the sudden pressure drop, part of the high-temperature water in the slag flushing water is rapidly vaporized to form steam to realize the flash evaporation of the slag flushing water. At this time, the steam quickly fills the entire C area and, along with the rise of the pressure reducing plate 33, the steam enters the B area through the conical pipe 42 and the cover plate 41.

[0057] When steam enters area B, the steam pushes the limiting ball 43 to cause relative displacement between the limiting ball 43 and the conical tube 42 and a gap appears. The steam further enters area B through the gap between the conical tube 42 and the limiting ball 43. By setting the limiting ball 43, the concentration of the steam entering area B can be effectively guaranteed, and when the steam contacts the outer contour of the limiting ball 43, some droplets entrained in the steam will adhere to the outer surface of the limiting ball 43 and provide lubrication for the sliding of the limiting ball 43.

[0058] After the steam enters the B area, along with the descent of the pressure reducing plate 33, the spatial volume of the B area is gradually compressed. At this time, the steam further enters the A area through the cover plate 34, and again along with the rise of the pressure reducing plate 33, the spatial volume of the A area is gradually compressed, and the steam is squeezed into the subsequent dehumidification components to complete the steam diversion operation.

[0059] Since the pressure reducing plate 33 rotates synchronously with the reciprocating threaded column 3 during the lifting process, the positioning shaft 44 is connected to the pressure reducing plate 33 and the pressure limiting plate 4 by a limited transmission, that is, the pressure reducing plate 33 synchronously drives the pressure limiting plate 4 and the positioning shaft 44 to rotate, and the bottom end of the positioning shaft 44 further drives the stirring blade 46 to rotate synchronously around the axis of the rotating ring 45. The rotation of the stirring blade 46 realizes sufficient stirring of the slag flushing water, thereby avoiding scaling caused by static deposition of the slag flushing water.

[0060] At the same time, the rotation of the pressure reducing plate 33, the positioning shaft 44 and the pressure limiting plate 4 drives the steam in the three areas A, B and C to rotate synchronously, thereby forming a spiral airflow in the internal space of the heating equipment 1. Since the mass of droplets and solid particles is significantly greater than the mass of gas, the centrifugal effect of the spiral airflow is used to preliminarily remove droplets and solid particles in the steam to ensure the normal operation of subsequent components.

[0061] It should be noted that during the separation process, as the pressure reducing plate 33 rises and falls, the pressure reducing plate 33 scrapes the inner wall of the middle section of the heating device 1. At this time, under the action of centrifugal force, the droplets and solid particles attached to the inner wall of the middle section of the heating device 1 are collected on the upper surface of the pressure limiting plate 4.

[0062] Embodiment 4:

[0063] See also Figures 7 and 8, this embodiment further illustrates Example 3, the dehumidification component includes a blower 5, the top of the blower 5 close to the heating device 1 is penetrated and fixedly connected with a guide pipe 1 51, the end of the guide pipe 1 51 away from the blower 5 is penetrated and fixedly connected to the heating device 1, the bottom of the blower 5 away from the heating device 1 is penetrated and fixedly connected with a guide pipe 2 52, the end of the guide pipe 2 52 away from the blower 5 is penetrated and fixedly connected with a cooler 6, the bottom end of the cooler 6 is penetrated and fixedly connected with a drain pipe 61, the top of the cooler 6 The end of the cooler 6 is penetrated and fixedly connected with an exhaust pipe 62, the end of the cooler 6 away from the blower 5 is fixedly connected to the circulator 7, the end of the circulator 7 away from the cooler 6 is penetrated and fixedly connected with a heat conduction pipe 71, the top end of the exhaust pipe 62 is penetrated and fixedly connected with a heater 72, the end of the heat conduction pipe 71 away from the circulator 7 is penetrated and fixedly connected to the outer contour of the heater 72, the top end of the heater 72 is penetrated and fixedly connected with an air guide pipe 73, the end of the air guide pipe 73 away from the circulator 7 is penetrated and fixedly connected to the outer contour of the top end of the heating device 1.

[0064] The flash steam after gas-liquid separation is stored in area A and is squeezed into the interior of guide tube 1 51 as the pressure reducing plate 33 rises. According to Bernoulli's principle, the steam is attracted by the airflow generated by the rotation of the blower 5 and enters the interior of the blower 5 and is discharged along the guide tube 2 52. The blower 5 provides airflow power for the steam and sends it into the cooler 6.

[0065] The steam entering the cooler 6 is cooled, causing the temperature to drop below the dew point, and the condensed liquid water and water vapor are separated under the action of the cooler 6. The liquid water is discharged through the drain pipe 61 to prevent it from re-entering the air flow. The liquid water is further processed to meet the industrial water standards and can be reused in the ironmaking process or other links requiring water. The water vapor enters the heater 72 through the exhaust pipe 62. The cooler 6 usually adopts a tubular or plate heat exchanger, the material of which is corrosion-resistant and has high heat transfer efficiency.

[0066] During the process of condensing and separating steam in the cooler 6, the absorbed heat energy is stored inside the circulator 7 and the heat pipe 71 supplies heat to the heater 72. The water vapor entering the heater 72 is heated into dry air by the heater 72 and enters the area A inside the heating device 1 along the air pipe 73; the heater 72 usually adopts electric heating or heat exchange, with uniform heating, controllable temperature and high efficiency.

[0067] The dry air entering area A is fully mixed with the flash steam in area A to reduce the humidity and impurity concentration of the flash steam, thereby effectively reducing the workload of subsequent components. The above process realizes the waste heat recovery of the slag water and the recycling of water resources and heat energy.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recovering waste heat from ironmaking slag flushing water, comprising the following steps: S1. Pretreatment and flash evaporation: The high-temperature slag-washing water is firstly subjected to preliminary solid-liquid separation by a screening mechanism to remove large particle impurities, and the pretreated slag-washing water is further introduced into the steam component, where a sudden pressure drop is used to vaporize part of the water to generate flash steam; S2, steam treatment: the steam generated by flash evaporation contains a certain amount of water vapor and a small amount of non-condensable gas and impurities. A centrifugal mechanism is used to preliminarily remove droplets and solid particles in the steam; the separated steam is further introduced into the subsequent dehumidification component through a blower (5); S3, dehumidification by diversion: In the dehumidification process, the steam is first cooled by the cooler (6) to condense part of the water vapor into liquid water and remove most of the water; the condensed water is then collected and processed for recycling; further, the dehumidified air is heated by the heater (72) to prevent the moisture from re-condensing and to increase the dryness of the air. At this time, the dried air is further circulated into the steam component; S4. Energy recovery and water resource utilization: The heat in the steam component and the dehumidification component is recovered through the circulator (7), and the waste heat of the ironmaking slag flushing water is recovered and utilized; the condensed water is further treated to meet the industrial water standard and reused in the ironmaking process or other links requiring water, thereby realizing the recycling of water resources.

2. A dehumidification device for recovering waste heat from iron-making slag-washing water, applied to a waste heat recovery method for iron-making slag-washing water according to claim 1, characterized in that: The invention comprises a heating device (1) for providing storage and reaction space for ironmaking slag water, wherein a fixing seat (11) is fixedly connected to the center of the inner contour of the bottom end of the heating device (1), an L-shaped feed pipe (12) is penetrated and fixedly connected to one side of the bottom end of the heating device (1), a driving ring (13) is penetrated and connected to the center of the top end of the heating device (1) for limited rotation, and a screening mechanism for preliminary solid-liquid separation of the slag water is arranged at the top end of the L-shaped feed pipe (12).

3. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 2, characterized in that: The screening mechanism comprises a collecting hopper (2), the bottom end of which is detachably mounted on the outer contour of an end of an L-shaped feed pipe (12) away from the heating device (1), a fixing rod (21) is fixedly connected to the inner contour of the top end of the collecting hopper (2), a threaded shaft (22) is penetrated through the center of the fixing rod (21) and is connected to it for limited rotation, a knob (23) is fixedly connected to the top end of the threaded shaft (22), a conical sieve plate (24) is penetrated through and screwed on the outer contour of the middle section of the threaded shaft (22), and a steam component for adjusting the internal pressure of the heating device (1) is provided on the inner contour of the driving ring (13).

4. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 3, characterized in that: The ratio of the opening diameter at the bottom end of the collecting hopper (2) to the opening diameter at the top end of the L-shaped feed pipe (12) is one to one, and the ratio of the opening diameter at the bottom end of the conical screen plate (24) to the opening diameter at the top end of the L-shaped feed pipe (12) is eight to ten.

5. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 3, characterized in that: The steam component comprises a reciprocating threaded column (3), the middle section of the reciprocating threaded column (3) is threadedly connected to the inner contour of the driving ring (13), a connecting rod (31) is penetrated and fixedly connected to the outer contour of the bottom end of the reciprocating threaded column (3), both ends of the connecting rod (31) are fixedly connected to a support shaft (32), the bottom end of the support shaft (32) is fixedly connected to a pressure reducing plate (33), the center of the top end of the pressure reducing plate (33) is penetrated and rotatably connected to a cover plate 1 (34) via a pin shaft, and a centrifugal mechanism for secondary solid-liquid separation of flash steam is arranged at the bottom of the internal space of the heating device (1).

6. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 5, characterized in that: The centrifugal mechanism comprises a pressure limiting plate (4), the center of the top end of the pressure limiting plate (4) is penetrated and rotatably connected to a cover plate 2 (41) via a pin shaft, the center of the bottom end of the pressure limiting plate (4) is fixedly connected to a conical tube (42), the inner limiting sliding connection of the conical tube (42) is connected to a limiting ball (43), the outer contour of the pressure limiting plate (4) is penetrated and connected to a limiting transmission with a positioning shaft (44), the top end of the positioning shaft (44) is penetrated and connected to a pressure reducing plate (33) via a limiting transmission, the outer contour of the fixed seat (11) is rotatably connected to a rotating ring (45), the outer contour of the rotating ring (45) is fixedly connected to a stirring blade (46), and a dehumidification component for recovering waste heat from steam is arranged at a time of the heating device (1) away from the collecting hopper (2).

7. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 6, characterized in that: The reciprocating threaded column (3) is driven by an external motor and is fixedly connected to the output shaft of the motor. The ratio of the dimensions of the pressure reducing plate (33), the pressure limiting plate (4) and the inner contour of the heating device (1) is one to one. A plurality of stirring blades (46) are provided and are symmetrically distributed along the axis of the rotating ring (45). The bottom end of the positioning shaft (44) is in contact with the outer contour of the stirring blade (46) and is transmission-connected.

8. A dehumidification device for recovering waste heat from ironmaking slag flushing water according to claim 6, characterized in that: The dehumidification component comprises a blower (5), the top end of the blower (5) close to the heating device (1) is penetrated by and fixedly connected with a guide pipe (51), the end of the guide pipe (51) away from the blower (5) is penetrated by and fixedly connected with the heating device (1), the bottom end of the blower (5) away from the heating device (1) is penetrated by and fixedly connected with a guide pipe (52), the end of the guide pipe (52) away from the blower (5) is penetrated by and fixedly connected with a cooler (6), the bottom end of the cooler (6) is penetrated by and fixedly connected with a drain pipe (61), the top end of the cooler (6) is penetrated by and fixedly connected with An exhaust pipe (62), one end of the cooler (6) away from the blower (5) is fixedly connected to a circulator (7), one end of the circulator (7) away from the cooler (6) is penetrated by and fixedly connected to a heat conduction pipe (71), the top end of the exhaust pipe (62) is penetrated by and fixedly connected to a heater (72), the end of the heat conduction pipe (71) away from the circulator (7) is penetrated by and fixedly connected to the outer contour of the heater (72), the top end of the heater (72) is penetrated by and fixedly connected to an air guide pipe (73), and the end of the air guide pipe (73) away from the circulator (7) is penetrated by and fixedly connected to the outer contour of the top end of the heating device (1).

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