WO2021109325A1 - Dispositif de granulation par voie sèche de laitier liquide en fusion et de récupération de chaleur perdue présentant une fonction de broyage de laine de laitier et son procédé de fonctionnement - Google Patents

Dispositif de granulation par voie sèche de laitier liquide en fusion et de récupération de chaleur perdue présentant une fonction de broyage de laine de laitier et son procédé de fonctionnement Download PDF

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Publication number
WO2021109325A1
WO2021109325A1 PCT/CN2020/072567 CN2020072567W WO2021109325A1 WO 2021109325 A1 WO2021109325 A1 WO 2021109325A1 CN 2020072567 W CN2020072567 W CN 2020072567W WO 2021109325 A1 WO2021109325 A1 WO 2021109325A1
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WIPO (PCT)
Prior art keywords
slag
granulation
bin
waste heat
heat recovery
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PCT/CN2020/072567
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English (en)
Chinese (zh)
Inventor
王树众
赵军
徐宁文
吴志强
肖照宇
李美全
马琛
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西安交通大学
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Publication of WO2021109325A1 publication Critical patent/WO2021109325A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the invention belongs to the technical field of high-temperature liquid slag waste heat recovery, and particularly relates to a liquid slag dry granulation and waste heat recovery device with a slag cotton crushing function and an operation method thereof.
  • Dry slag pit cooling method and water flushing slag method are currently the most common blast furnace slag treatment methods.
  • the dry slag pit method produces a large amount of water vapor when cooling down, and releases a large amount of H 2 S and SO 2 gas at the same time, which corrodes buildings, destroys equipment and deteriorates the working environment.
  • the water flushing slag method wastes a lot of water resources during the treatment process, generates harmful gases such as SO 2 and H 2 S, and cannot effectively recover the high-quality waste heat resources contained in the high-temperature liquid slag.
  • these treatment methods can no longer meet the current urgent needs of energy saving and emission reduction in the steel industry, and the dry granulation method is widely favored due to its low system energy consumption, small and uniform particle size, and high product added value.
  • the liquid filaments broken from the granulator are rapidly cooled, and they are quickly cooled before they are broken into slag particles, forming a large amount of slag wool.
  • the slag wool continuously accumulates around the granulator, and even entangles on the motor shaft, causing the motor to jam, which is very unfavorable to the granulation process, and the production of slag wool seriously affects the equipment's recovery of slag waste heat.
  • the gathering of slag and cotton masses leads to poor discharge of particles and eventually blocks the moving bed, which will cause serious accidents. Therefore, the generated scum should be cleaned up in time to ensure the safe and stable operation of the dry granulation system and enhance the waste heat recovery effect.
  • the purpose of the present invention is to provide a liquid slag dry granulation and waste heat recovery device with slag wool crushing function and an operating method thereof, so as to solve the problem of the formation of slag wool in the current dry granulation process of liquid slag and cause damage to the granulation system. Hazardous technical issues.
  • a device for dry granulation and waste heat recovery of liquid molten slag with slag and cotton crushing function of the present invention includes: a granulation bin, a granulation system, a slag and cotton crushing device and a moving bed; the peripheral wall and roof of the granulation bin The walls are all cooling walls; the top wall of the granulation bin is provided with a temperature measuring device and a slagging pipe; the granulation bin is provided with the granulation system, and the granulation system is used for granulation from the slag drop Tube falling into the blast furnace slag of the rotor cup; the granulation system includes a rotor cup, the rotor cup is located directly below the slag tube, the lower part of the rotor cup is provided with a partition wall; the partition wall is provided with a reciprocating motion Shearing crusher, the shearing crusher is used to crush the slag cotton flying out from the rotor; the position of the moving bed is lower than the position of the shearing crusher
  • a further improvement of the present invention is that the temperature measuring device is an infrared temperature measuring device.
  • a further improvement of the present invention is that the shearing crusher is a staggered saw-tooth scraper or a rotary shearing drum.
  • a further improvement of the present invention is that the rake is provided with a cooling medium inlet and a cooling medium outlet; the cooling medium inlet is arranged outside the granulation bin, and the cooling medium outlet is arranged outside the granulation bin.
  • a further improvement of the present invention is that a cooling medium is passed through the rake; the cooling medium is gas, water or organic medium.
  • a further improvement of the present invention is that the crusher is located between the rake and the bulk material accumulation part.
  • a further improvement of the present invention is that the cooling air duct is provided with a plurality of air outlets, and each air outlet is provided with a hood.
  • the operation method of the above-mentioned liquid slag dry granulation and waste heat recovery device with slag cotton crushing function of the present invention includes the following steps:
  • the slag cotton flying out of the rotor cup is crushed once by the shearing crusher; the slag cotton after the first crushing falls into the moving bed below under the action of gravity;
  • the fallen scum is combed back and forth by the rake, and the scum is concentrated on the crushers on both sides;
  • the slag wool is crushed for the second time by the crusher, and finally falls into the bulk material accumulation part to form a bulk material accumulation layer to complete the dry granulation of liquid slag and waste heat recovery.
  • the present invention has the following beneficial effects:
  • the device of the present invention in the early stage of system operation, when the cooling rate is too low, a large amount of scum will be formed during the granulation process. After the slag wool is generated, it surrounds the granulation system. The shearing crusher cuts the slag wool around the outlet of the granulation system to prevent the slag wool from agglomerating around the rotor and reduce the occurrence of accidents. Under the action of gravity, the disconnected slag wool will fall into the moving bed heat exchange device, and the reciprocating rake will send the slag wool to the crusher below to further cut the slag wool to prevent the occurrence of agglomeration of the slag wool and cause particle discharge. The phenomenon of blocking the moving bed due to poor material. In the device of the present invention, after a large amount of scum quilt is cut and broken, it is beneficial to enhance heat exchange and increase the waste heat recovery rate.
  • the shearing crusher is a device with a shearing effect, and horizontal or vertical staggered saw-tooth scrapers, rotary shearing drums, etc. can be selected.
  • the operating method of the present invention is used to operate the device of the present invention, can cut and clean the generated slag cotton in time, can ensure the safe and stable operation of the dry granulation system, and can enhance the waste heat recovery effect at the same time.
  • FIG. 1 is a schematic structural diagram of a liquid slag dry granulation and waste heat recovery device with slag cotton crushing function according to an embodiment of the present invention
  • a device for dry granulation and waste heat recovery of liquid slag with slag cotton crushing function includes: a granulation bin arranged above, a granulation system located in the middle of the granulation bin, and A moving bed arranged below.
  • the periphery and ceiling of the granulation bin are composed of cooling wall surfaces 9, and an infrared temperature measuring device 8 is arranged at the ceiling.
  • a slagging pipe 2 is arranged on the top of the granulation bin, and a granulation system is arranged directly below the slagging pipe.
  • a partition wall 10 is arranged under the rotor cup 3 of the granulation system, and a reciprocating shearing crusher 1 is arranged on the partition wall 10, that is, the shearing crusher 1 is arranged above the partition wall 10 of the rotor cup 3.
  • a reciprocating rake 4 is arranged at the upper part, the crusher 5 is arranged at the lower part of the rake 4 and the upper part of the bulk material accumulation part 7, and a cooling air duct 11 is arranged at the lower part of the moving bed.
  • the rake 4 arranged on the upper part of the moving bed has a cooling medium flowing inside.
  • the cooling medium inside the rake 4 can be determined according to the overall design processing capacity, ambient temperature and specific conditions of the device to determine the required cooling intensity. Choose gas, water or organic medium It is the cooling medium.
  • the cooling medium inlet 6 is arranged outside the granulation bin, and the cooling medium outlet may be arranged inside or outside the moving bed; there may also be no cooling medium circulating.
  • the crusher 5 is arranged above the bulk material accumulation part 7 and below the rake 4. There is cooling air circulating in the cooling air duct 11, and the air cap 12 is arranged above it.
  • the slag wool crushing process is as follows: the blast furnace slag falls from the slag tube into the rotor, the molten slag flies out of the rotor, and the slag slag falls on the partition wall after being cut by the shearing crusher.
  • the slag slag in the granulation bin is reciprocally combed by the rake and then falls on the crushers on both sides for crushing, and finally falls into the bulk material accumulation part.
  • the present invention in the early stage of system operation, when the cooling rate is too low, a large amount of scum will be formed during the granulation process.
  • the shearing crusher cuts the slag wool around the outlet of the granulation system to prevent the slag wool from agglomerating around the rotor and reduce the occurrence of accidents.
  • the disconnected slag wool will fall into the moving bed heat exchange device, and the reciprocating rake will send the slag wool to the crusher below to further cut the slag wool to prevent the occurrence of agglomeration of the slag wool and cause particle discharge.
  • the phenomenon of blocking the moving bed due to poor material.
  • after a large amount of scum quilt is cut and broken it is beneficial to enhance heat exchange and increase the waste heat recovery rate.
  • the present invention discloses a liquid slag dry granulation and waste heat recovery device with slag cotton crushing function and an operating method thereof.
  • the device consists of a granulation bin arranged above and a granulation bin located in the middle of the granulation bin. It consists of a chemical system and a moving bed arranged below.
  • the periphery and ceiling of the granulation bin are composed of cooling walls, and an infrared temperature measuring device is arranged at the ceiling.
  • a slagging pipe is arranged on the top of the granulation bin, and a granulation system is arranged directly below the slagging pipe.
  • the lower part of the chemical system rotor is arranged with a partition wall, and a reciprocating shearing crusher is arranged on the partition wall; for the mobile bed, a reciprocating rake is arranged on the upper part, and the crusher is arranged at the lower part of the rake and the upper part of the bulk material accumulation part.
  • a cooling air duct is arranged at the lower part of the moving bed.
  • the embodiment of the present invention also provides a liquid slag waste heat recovery system, which applies the granulation and waste heat recovery device of the present invention, including a slag buffer device, a flow control device, a centrifugal granulation device and a moving bed device; a slag buffer device One end of the device is connected to the slag trench, the other end of the slag buffer device is connected to the inlet end of the flow control device, the outlet end of the flow control device is connected to the inlet end of the centrifugal granulation device, and the outlet end of the centrifugal granulation device is connected to the moving bed
  • the connection of the device; the liquid slag is discharged from the slag ditch and first enters the slag buffer device, and then passes through the flow control device, the centrifugal granulation device and the moving bed device in sequence.
  • the slag buffer device includes a slag bag body and a slag bag cover; the slag bag cover is sealed and arranged above the slag bag body, and a slag bag inner cavity is formed between the slag bag cover and the slag bag body; one end of the slag bag body is provided with a slag inlet , The other end is provided with an accident slag discharge port; the slag inlet is connected with the outlet end of the slag ditch, and the liquid slag enters the cavity of the slag ladle through the slag inlet; the accident slag discharge port is used to connect with the accident diversion tank, and the accident guide
  • the launder is connected to the slag pit; the side wall of the slag bag body is provided with a slag outlet, and a slag outlet is provided with a slag outlet; one end of the slag outlet is connected to the inner cavity of the slag bag, and the other end is connected to the flow control device;
  • the flow control device includes an upper sealing cover, a device bottom plate, a slag pipe, a weir plate, and a stopper rod; the upper sealing cover is sealed on the device bottom plate and connected to the slag buffer device; the upper sealing cover is provided with a stopper rod on the side wall Operation port, maintenance entrance and high temperature flue gas inlet, stopper rod is installed on the stopper rod operation port, one end of the stopper rod is used to connect with the slag outlet, and the other end is extended to the outside of the upper sealing cover; high temperature flue gas inlet and high temperature flue gas The outlet end of the channel is connected; the bottom of the device bottom plate is provided with a slag drop port, one end of the slag pipe is connected with the slag drop port, and the other end is connected with the centrifugal granulation device; the upper end of the slag pipe is provided with a weir plate; one side of the device bottom plate A slag discharge port is provided, and the slag discharge port is connected
  • the granulation device includes a granulation bin, a flue gas ring header, a granulator, a heat exchange tube bundle, a granulation air duct and a collecting flue; the granulation bin is arranged under the flow control device, and the inlet end of the granulation bin is connected to the The outlet end of the flow control device is connected; the flue gas annular header is set at the inlet end of the granulation bin, one end of the flue gas annular header is connected with the granulation bin, and the other end is connected through the collecting flue; the granulator is set at the granulation bin In the center of the silo, the granulator is set directly opposite the outlet end of the flow control device; the heat exchange tube bundles are evenly arranged in the granulation silo, and the granulated air distribution pipes are arranged below the heat exchange tube bundles.
  • the inner wall of the granulation silo is provided with a membrane type water wall, which includes a water wall tube, a side iron of the water wall tube and a small air outlet.
  • the water wall tube is arranged vertically upwards and passes between two adjacent water wall tubes.
  • the edge iron of the water wall tube is connected, and the edge iron of the water wall tube is provided with a small air outlet.
  • the moving bed device includes a heat exchange bin, a slag wool scraper, a flattening device, a roll crushing device and an air distribution mechanism.
  • the heat exchange warehouse is arranged below the granulation warehouse, the center of the heat exchange warehouse is provided with an installation space for the granulation device, and the granulation rotor is installed on the installation space; both sides of the granulation rotor are equipped with slag cotton scrapers and slag cotton scrapers.
  • the slag cotton scraper is provided with a flattening device, a roll crushing device is set below the flattening device, and an air distribution mechanism is set below the roll crushing device;
  • the slag cotton scraper is at 180° Set on both sides of the granulation rotor, the slag scraper adopts a zigzag structure;
  • the slag scraper can reciprocate on the side of the granulation rotor to realize the cutting of the slag around the granulation rotor and the cut slag. It falls into the heat exchange bin under the action of gravity;
  • the slag wool scraper is made of 310S stainless steel with high temperature resistance.
  • the flattening device is arranged under the slag wool scraper and is located in the upper high temperature section of the heat exchange bin; the flattening device is symmetrically arranged on both sides of the granulation rotor, and the flattening device is connected with the motor and reciprocates under the drive of the motor. It realizes the reciprocating combing of the surface of the material layer, which plays the role of uniform material layer.
  • the flat material device adopts air-cooled rake.
  • the air-cooled rake is symmetrically arranged on both sides of the granulation rotor.
  • the air-cooled rake is evenly equipped with an exhaust device.
  • the roll crushing device is arranged under the flat material device and located in the middle temperature part of the heat exchange bin; the roll crushing device is symmetrically arranged on both sides of the granulation rotor.
  • the roll crushing device adopts several pairs of air-cooled roll crushing devices.
  • the cold roll crushing device is connected to the two ends of the heat exchange chamber, and the rotation direction of each pair of air-cooled roll crushing devices is different; the air-cooled roll crushing device can cut the larger-diameter slag or slag mass.
  • the particle size slag or slag wool mass is crushed by the air-cooled roller crushing device to form small slag blocks, and the small slag blocks continue to exchange heat in the heat exchange chamber.
  • the air distribution mechanism includes a first-level air distribution pipe and a second-level air distribution pipe.
  • the first-level air distribution pipe is arranged at the bottom of the heat exchange chamber, and the second-level air distribution pipe is arranged above the first-stage air distribution pipe; Both ends of the first-level air distribution pipe and the second-level air distribution pipe are softly connected to the side wall of the heat exchange chamber and connected to the vibration motor; the first-level air distribution pipe is evenly provided with a number of first air supply hoods, The distance between two adjacent first air supply hoods is more than twice the diameter of the first-stage air distribution pipe;
  • the second-level air distribution pipe has three layout forms:
  • a plurality of inverted U-shaped structures are evenly arranged on the second-level air distribution pipe, the opening of the inverted U-shaped structure is downward, and the arc section extends upward, and the second air supply hood is provided above the arc section of the inverted U-shaped structure ;
  • a plurality of inverted U-shaped structures are evenly arranged on the second-level air distribution pipe, the opening of the inverted U-shaped structure is downward, and the arc section extends upward, and the air outlet is provided under the arc section of the inverted U-shaped structure;
  • a plurality of upright air pipes are evenly arranged on the second-level air distribution pipe, and a hood is arranged on the upper end of the upright air pipe.
  • the height of the inverted U-shaped structure can extend to the material layer above 800°C.
  • the liquid slag is discharged from the slag ditch and sequentially passes through the slag buffer device, the flow control device, the centrifugal granulation device, the moving bed device and the slag discharge module;
  • the waste heat recovery medium is Air and water, where the air passes through the moving bed device, the centrifugal granulation device, the high temperature flue and the waste heat boiler in sequence, and the water passes through the economizer, the moving bed device, the centrifugal granulation device, the waste heat boiler and the superheater heating surface module in sequence.
  • Liquid slag enters the inner cavity of the slag buffer device through the slag inlet on the upper part of the slag buffer device, and then is discharged from the sizing nozzle provided on the side of the slag buffer device, and flows into the outer liquid slag flow control device, the flow control device Arranged with a weir plate structure, the inflowing slag smoothly flows into the slagging tube into the centrifugal granulation module after submerging the weir plate structure; at the same time, a burner inlet is arranged on the slag buffer device cover for installing the burner;
  • the other side of the cache device cover is provided with a high-temperature flue gas outlet;
  • the upper part of one end of the slag cache device is equipped with a slag inlet, the bottom of the other end is equipped with an accident slag outlet, and the upper part is equipped with a peep hole; an accident is provided outside the accident slag outlet
  • the diversion groove leads to the water
  • the outside of the cover is operated by the stopper rod operating device port to operate the stopper rod head and the sizing nozzle to control the flow;
  • the bottom of the liquid slag flow control device is inclined design, and the angle with the horizontal plane is 5°-10°, and the other end is provided with a slag discharge port
  • the outside of the slag discharge port is provided with a slag lead trench, which merges into the accident diversion groove at one end of the slag buffer device;
  • the top of the slag pipe is equipped with a weir structure, and the outside of the lower tribe slag pipe is equipped with a heating device.
  • the slag buffer device can be arranged in a rectangular structure, a circular structure or a circular structure according to the on-site space, and the flow control device is uniformly or non-uniformly distributed on the outer side of the slag buffer device.
  • the burner inlet for installing the burner arranged between the cover of the slag buffer device is arranged obliquely downwards at a certain angle to the horizontal.
  • the other side of the cover of the slag buffer device is provided with a high-temperature flue gas outlet, and the outside is connected with a high-temperature flue , It is connected with the high temperature flue gas inlet on the side of the sealing cover, and there is a valve on the pipe.
  • the burner adopts a single, or multiple symmetrical or staggered arrangement.
  • the lower part of the slag flow control device and the part under the opening of the stopper operating device is set in an inclined structure to ensure that the slag of the module can be drained; there is a weir structure on the periphery of the top of the slag pipe, and the slag flowing into the module needs to be drained. It flows into the slagging pipe through the weir to avoid the fluctuation of the liquid level inside the slagging pipe and to ensure the accuracy of liquid level measurement.
  • the inner wall of the granulation silo is equipped with a membrane water wall, and the water wall is arranged vertically upward. There is a small hole in the middle of the water-cooled side iron, and the small hole has a certain inclination angle.
  • the flue gas in the granulation warehouse is led out from the gap of the flue gas outlet, and the drawn flue gas is collected in the flue gas ring header, and finally flows into the waste heat boiler and other equipment through the collecting flue.
  • the position of the flue gas outlet gap mainly has the following two implementation methods:
  • a flue gas outlet gap is opened around the top of the granulation bin, and the flue gas flows into the flue gas annular header through the flue gas outlet gap around the granulation bin, and finally a collecting flue is set on the flue gas annular header to draw out the flue gas .
  • a flue gas outlet gap is opened around the slag pipe in the center of the granulation warehouse, and the flue gas flows into the flue gas annular header through the flue gas outlet gap in the center of the granulation warehouse, and finally a collecting flue is set on the flue gas annular header to lead out Smoke.
  • slag wool scrapers are set in the connecting section of the moving bed waste heat recovery device and the granulation rotor.
  • the slag scrapers are arranged on both sides of the granulation rotor and arranged at 180°. They are designed according to the sawtooth structure and are made of 310S stainless steel with high temperature resistance. Material. In the early stage of operation of the waste heat recovery system, when the speed of the granulator is too fast or the temperature of the equipment is too low, a large amount of scum will be formed during the centrifugal granulation process.
  • a reciprocating serrated scraper is installed on the side of the rotor to cut off the slag around the rotor.
  • air-cooled rakes are arranged in the high temperature section on the upper part of the moving bed.
  • the air-cooled rakes are arranged on both sides in a symmetrical structure.
  • the air-cooled rakes are driven by the motor to reciprocate combing the surface of the material layer, which plays the role of evening the material layer.
  • the air-cooled rake is provided with symmetrically distributed air exhaust devices to enhance the heat exchange effect in the high temperature section of the bed.
  • an air-cooled roll crushing device is installed in the lower part of the air-cooled rake, that is, the middle temperature section of the moving bed.
  • the crushing device adopts a symmetrical distribution and is arranged at both ends of the warehouse.
  • a pair of air-cooled rolls rotate in different directions, and the material layer of the moving bed is discharged more smoothly by using the effect of shearing force.
  • a multi-stage air supply hood is set in the lower part of the moving bed.
  • the distance between the hood and the air supply pipe can be designed to be more than twice the diameter of the air supply pipe to ensure that the slag and The slag wool will not block the bottom of the moving bed.
  • the upper air supply pipe of the secondary air supply hood at the bottom of the moving bed protrudes upward at regular intervals to form an inverted "U"-shaped structure air pipe.
  • the air pipe and the side wall of the moving bed are connected by a soft connection, and the vibration motor drives the air pipe to vibrate to ensure smooth discharge.
  • the inverted "U"-shaped air duct can be set high enough to enter the material layer above the middle temperature section to further strengthen the waste heat recovery.
  • the flue gas of the baking slag buffer device will enter the high-temperature flue along the high-temperature flue gas outlet, first enter the outer liquid slag flow control device, and then The high-temperature flue gas enters the lower centrifugal granulation device through the slagging pipe, and finally flows into the moving bed device through the centrifugal granulation device. After the high temperature flue gas enters the system for a period of time, the waste heat recovery of the system begins. When the entire flue gas enters the waste heat recovery system, it plays a role of preheating the drying bag. Because the parts of the entire system are mostly made of high-temperature resistant metals, they are expensive.
  • the slag buffer device in the slag waste heat recovery system of the present invention includes a slag ladle, a combustion device and a flue gas pipeline; a plurality of combustion devices are arranged on the top of the slag ladle cover and communicate with the inner cavity of the slag ladle;
  • the side of the bag is connected with a flow control device, and the slag bag body is connected to the flow control device through the high-temperature flue gas pipeline and the slag outlet; the flow control device is used to control the flow of the slag bag to the flow control device;
  • the flow control device includes an upper sealing cover, a weir plate of the device bottom plate, a slagging pipe and a stopper rod; the upper sealing cover is also sealed to the side wall of the slag ladle body; a slagging pipe is provided at the bottom of the liquid slag flow measurement and control device, and the slagging pipe is above it There is a weir plate.
  • the stopper rod includes a stopper rod and a stopper rod; the stopper rod operating port is provided on the sealing cover, the stopper rod rod is provided in the stopper rod operating port, and the end of the stopper rod located inside the sealing cover is provided with a stopper rod head; A sizing nozzle is arranged on the upper communicating with the flow control device, the plug head can be inserted into the sizing nozzle, and a heating device is arranged at the sizing nozzle.
  • the flue gas pipeline includes a high-temperature flue gas outlet, a high-temperature flue, a high-temperature flue gas inlet and a valve; the high-temperature flue gas outlet is set on the top of the slag bag, the high-temperature flue gas inlet is set on the flow control device, and one end of the high-temperature flue is connected to the high-temperature flue gas.
  • the gas outlet is connected, and the other end is connected with the high-temperature flue gas inlet; the high-temperature flue is provided with a valve.
  • each burner inlet is provided with a burner; the burner inlet is arranged obliquely.
  • the inside of the slag ladle has an inclined structure from the end of the slag inlet to the end of the accident discharge outlet; the accident diversion groove is arranged outside the accident discharge outlet.
  • the bottom plate of the flow control device is an inclined structure toward the direction of the slag pipe; a heating device is arranged under the slag pipe; the side of the flow control device at the position of the slag pipe is provided with a slag discharge port; the outside of the slag discharge port is provided with a slag lead groove, Into the accident diversion tank located at one end of the slag bag.
  • the top of the sealing cover is provided with a radar level gauge and an infrared thermometer; the side of the sealing cover is provided with an access for maintenance.
  • the slag bag in the invention is provided with a slag bag accident slag discharge port, and the bottom surface of the slag bag cavity is designed to be inclined.
  • the liquid slag in the slag bag cavity can be quickly removed in a short period of time.
  • the filling material is injected into the slag discharge port of the slag bag accident; if the liquid slag in the cavity of the slag bag needs to be discharged urgently in the case of emergency slag discharge, the slag can be discharged
  • the filling in the slag discharge port of the accident slag is opened, so as to quickly discharge the high-temperature liquid slag in the cavity of the slag bag, which can effectively prevent the liquid slag from cooling and condensing in the cavity of the slag bag;
  • the circulation area of the accident slag discharge port is The flow area after specific calculation can be calculated according to the actual volume of the slag ladle cavity.
  • the accidental slag discharge sizing nozzle The material is high-temperature wear-resistant and corrosion-resistant material.
  • the lower plane of the accident slag discharge sizing nozzle is lower than the bottom of the inner cavity of the slag ladle and is inclined downward to ensure the discharge.
  • one or more burners can be arranged on the side of the slag bag cover according to the actual volume of the slag bag to preheat and supplement the heat of the inner cavity of the slag bag; the outlet of the burner is inside the slag bag Inclined downwards, while satisfying the heating function, it avoids the high-temperature baking of the same part of the slag cover by the horizontally arranged burner, thereby preventing the slag cover from cracking.
  • a high-temperature flue gas outlet is provided on the slag ladle cover, and a high-temperature flue gas duct with a valve is connected with the high-temperature flue gas inlet arranged on the side of the sealing cover to connect the high temperature generated in the inner cavity of the slag ladle during the heating stage.
  • the flue gas is introduced into the sealed cover to preheat the liquid slag flow control device, and then flows into the subsequent flue gas processing unit; this structure not only utilizes the flue gas generated by the burner's supplementary heating and preheating, but also reaches the convection flow
  • the purpose of preheating by the device of the control device is to make full use of the heat and improve the energy utilization rate.
  • the bottom of the flow control device has an inclined design and has a certain angle with the horizontal plane.
  • the other end is provided with a slag discharge port, and the outside of the slag discharge port is provided with a slag lead groove, which merges into the accident diversion groove at one end of the slag bag;
  • the design of the structure of the bottom surface and the slag discharge port allows the slag discharge port to be opened during the system startup stage, and the filling in the sizing nozzle is drained from the slag discharge port, and then the slag discharge port is blocked and enters the normal operation stage;
  • the design of the inclined bottom surface can also ensure that the liquid slag is completely drained from the flow control device during the maintenance and shutdown phases, and avoid the residues sticking to the surface of the equipment and causing damage.
  • the top of the slag falling pipe of the flow control device is provided with a weir plate, and the liquid slag in the inner cavity of the slag ladle is discharged through the sizing nozzle and enters the flow control device.
  • the slag on the bottom plate of the flow control device is only where the liquid level reaches the weir plate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)

Abstract

L'invention concerne un dispositif de granulation par voie sèche de laitier liquide en fusion et de récupération de chaleur perdue présentant une fonction de broyage de laine de laitier et son procédé de fonctionnement, comprenant : un réservoir de granulation, un système de granulation, un dispositif de broyage de laine de laitier et un lit mobile. Une paroi supérieure du réservoir de granulation est pourvue d'un dispositif de mesure de température et d'une conduite de chute de laitier. Le système de granulation est disposé dans le réservoir de granulation, le système de granulation comprend une coupelle rotative, la coupelle rotative est située directement sous le conduit de chute de laitier, et une paroi de séparation est disposée au niveau d'une partie inférieure de la coupelle rotative. Un broyeur à cisaillement en va-et-vient est disposé sur la paroi de séparation. La position du lit mobile est inférieure à celle du broyeur à cisaillement, et le lit mobile comprend un râteau et un broyeur. Le râteau et le broyeur sont disposés dans le réservoir de granulation, le râteau peut effectuer un mouvement de va-et-vient et la position du broyeur est inférieure à celle du râteau. Le fond du réservoir de granulation est une partie d'accumulation de matériau en vrac. Le fond du réservoir de granulation est pourvu d'un conduit d'air de refroidissement. La présente invention peut broyer efficacement la laine de laitier produite lors d'un processus de granulation, réduire l'occurrence d'accidents et améliorer le taux de récupération de chaleur perdue.
PCT/CN2020/072567 2019-12-04 2020-01-17 Dispositif de granulation par voie sèche de laitier liquide en fusion et de récupération de chaleur perdue présentant une fonction de broyage de laine de laitier et son procédé de fonctionnement WO2021109325A1 (fr)

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CN201911228420.4A CN111020073B (zh) 2019-12-04 2019-12-04 具有渣棉破碎功能的液态熔渣干式粒化及余热回收装置及其操作方法

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CN112239811A (zh) * 2020-08-13 2021-01-19 郴州雄风环保科技有限公司 一种实用型冰铜水淬工艺
CN115156260A (zh) * 2022-07-13 2022-10-11 东北大学 一种工业废盐熔融提纯-成粒系统及方法

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