CN111850194A - High-temperature steel slag bottom blowing air cooling crushing waste heat recovery device and method - Google Patents
High-temperature steel slag bottom blowing air cooling crushing waste heat recovery device and method Download PDFInfo
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- CN111850194A CN111850194A CN202010773125.3A CN202010773125A CN111850194A CN 111850194 A CN111850194 A CN 111850194A CN 202010773125 A CN202010773125 A CN 202010773125A CN 111850194 A CN111850194 A CN 111850194A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 215
- 239000010959 steel Substances 0.000 title claims abstract description 215
- 239000002918 waste heat Substances 0.000 title claims abstract description 81
- 238000001816 cooling Methods 0.000 title claims abstract description 79
- 238000011084 recovery Methods 0.000 title claims abstract description 65
- 238000007664 blowing Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000003546 flue gas Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims description 75
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- 238000004519 manufacturing process Methods 0.000 claims description 10
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- 238000003756 stirring Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 4
- 239000000112 cooling gas Substances 0.000 claims description 3
- 238000010795 Steam Flooding Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 17
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
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- 239000011147 inorganic material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000007885 magnetic separation Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
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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
- C21B3/08—Cooling slag
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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
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- 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
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
- C21B2400/058—Rotating beds on which slag is cooled
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a bottom blowing air cooling crushing waste heat recovery device and method for high-temperature steel slag. And a heat exchanger and a generator are adopted to cool the high-temperature steel slag to generate high-temperature waste heat for recycling and generating power. The crushing capacity is high, the treatment efficiency of the steel slag is greatly improved, and the waste heat recovery power generation can be realized by adopting air cooling heat exchange. The high-efficiency crushing and waste heat recovery of the high-temperature steel slag are realized, a steel slag water cooling system device is omitted, a wet flue gas treatment system caused by the conventional water cooling process is replaced by a simple dry dedusting mode, and the high-efficiency crushing and waste heat recovery device has the advantages of high automation degree, small space occupation, good tightness, low system investment, ultra-clean emission and the like, and improves the comprehensive economic benefit of steel slag treatment.
Description
Technical Field
The invention relates to a bottom blowing air cooling crushing waste heat recovery device and method for high-temperature steel slag, in particular to a device and method for air cooling crushing waste heat recovery for high-temperature molten steel slag generated in the production process of steel enterprises.
Background
In recent years, the annual steel yield of China exceeds 8 hundred million tons, which accounts for about 120-140 kg of steel slag generated by producing one ton of steel, and the annual steel slag generation amount of China exceeds 1 million tons. The steel slag contains two types of resources, namely iron metal resources and inorganic materials such as calcium silicate, and has the material property of resource utilization. For a long time, iron ores in China mainly depend on imports, and resources are very short. The steel slag in China is expected to recover nearly 2000 ten thousand tons of iron resources, and inorganic materials can reach more than 8000 ten thousand tons, so that the method has great significance in resource recovery value.
The high-efficiency recovery of metal iron and inorganic material resources in the steel slag is to perform crushing separation firstly and then realize the separation of the two materials by adopting magnetic separation and other modes, thereby obtaining targeted resource utilization. The steel slag pretreatment process is a precondition for steel slag crushing and magnetic separation treatment, and realizes more efficient crushing, screening and magnetic separation of the steel slag through pretreatment under a high temperature condition.
The prior steel slag pretreatment process comprises production processes such as a hot stuffy method, a hot splashing method, a roller method, a wind quenching method and the like, wherein the hot splashing method has the problems of backward production mode, simple and extensive treatment process, serious environmental pollution, low metal resource recovery rate and the like, and is required to be eliminated as soon as possible; the roller method is only suitable for liquid steel slag with good fluidity, the treatment rate of the steel slag is less than 50%, the equipment operation cost is high, the failure is high, and the roller method is only used for a few steel enterprises in a steel system at present; the air quenching method adopts large air volume to blow off and cool the liquid steel slag into fine particles, is only suitable for treating the liquid steel slag, has low recovery rate of steel metal iron resources, and only one set of air quenching equipment is provided for domestic horse steel.
The domestic main steel slag treatment method is a hot-disintegrating method, and the process has a series of advantages of wide adaptability, good steel slag pulverization effect after hot disintegration, good slag-iron separation effect, high metal iron recovery rate, qualified tailing stability and the like. The existing hot-sealing method is divided into a pool type hot-sealing process and a pressure hot-sealing process. The tank type hot stuffy method adopts a process method of engineering mechanized operation, namely an excavator is used for slagging off and crushing the high-temperature steel slag poured into the hot stuffy tank, and the equipment level and the environmental emission need to be further improved. The crushing method has the advantages of high equipment and automation degree and the like by adopting a mechanical rolling crusher to crush the high-temperature steel slag in a pressing and hot stuffiness mode, but the investment is relatively high, the tightness is poor, and the waste heat recovery cannot be carried out by adopting a water cooling mode in the crushing process.
The slag temperature of the steel slag reaches 1600 ℃, the heat value of each ton of slag exceeds 50kg of standard coal, and a large amount of waste heat resources are contained in the slag. The annual output of steel slag in China exceeds 1 hundred million tons, if all the waste heat resources are recycled, the newly increased economic benefit can reach billions of yuan every year, and the method has huge economic market space. At present, the waste heat recovery of high-temperature slag such as metallurgical slag is still often in a test research stage, and the complete resource utilization of two slag heat resources is often difficult to realize. A large number of laboratory and industrial pilot-scale test researches are carried out at home and abroad aiming at the recovery of the waste heat of the air-quenched steel slag, but the method is improper, the recovery rate of iron resources is low, the production is discontinuous, and the comprehensive economic benefit is poor, so that the production and the application cannot be realized. In addition, smelting slag is adopted to be cooled to generate steam or hot water for heat exchange utilization, but the waste heat utilization rate is low, and the economic condition of industrial operation is not met.
Aiming at the problems of large occupied space, high system investment, incapability of recycling waste heat and the like of the existing steel slag treatment process and equipment, a novel steel slag treatment process is urgently needed to be developed. Therefore, the novel steel slag cooling and crushing method and equipment have the advantages of high equipment automation level, small space occupation, low system investment, high waste heat recovery rate and the like. Therefore, better pre-crushing process technical equipment is provided for steel slag pressing and hot smoldering, the complete recycling of the two resources of 'slag heat' is realized at the same time, and the method is a cross-over upgrade of the existing steel slag treatment process technical equipment.
Disclosure of Invention
In order to solve the technical problem, the invention adopts the fixed shaft spiral crusher to crush the molten steel slag, the molten steel slag can be continuously poured into the spiral crusher, the spiral crusher rotates at a certain speed, and the steel slag is crushed and driven to the slag outlet at the same time. The equipment occupies small space, has low requirements on the span and height of a factory building, and greatly reduces the civil engineering cost; the device adopts a fixed spiral mode to drive the steel slag, a walking mechanism is not required to be arranged in a steel slag crushing area, a fully-closed processing environment can be realized, and the investment of a flue gas processing system is reduced. In a word, the system has the advantages of high automation degree of equipment, good production continuity, high treatment efficiency, small occupied space, low system investment, standard environmental emission and the like, and can meet the requirements of environmental emission and economy of steel slag treatment.
The invention relates to a bottom blowing air cooling crushing waste heat recovery device and method for high-temperature steel slag, wherein the device comprises a slag tank (1), a crushing bed (2), a closed cover (3), a crusher (8), a bottom blowing air cooling box (6), a hot stuffy tank (23), a flue gas waste heat recovery system and a control system (24). The crushing bed is used as a high-temperature steel slag treatment carrier, the crusher is used for efficiently crushing the steel slag, the bottom air blowing cold box is filled with cold air to solidify and cool the high-temperature steel slag, and the crusher rotates at a certain speed, advances forwards and backwards and rotates to crush the steel slag. And a heat exchanger and a generator are adopted to cool the high-temperature steel slag to generate high-temperature waste heat for recycling and generating power. The crushing capacity is high, the treatment efficiency of the steel slag is greatly improved, and the waste heat recovery power generation can be realized by adopting air cooling heat exchange. The invention realizes the high-efficiency crushing and waste heat recovery of the high-temperature steel slag, cancels a steel slag water cooling system device, adopts a simple dry dedusting mode to replace a wet flue gas treatment system caused by the prior water cooling process, has the advantages of high automation degree, small space occupation, good tightness, low system investment, ultra-clean emission and the like, greatly improves the comprehensive economic benefit of steel slag treatment, and has obvious technical and market competitiveness.
The invention relates to a bottom blowing air cooling crushing waste heat recovery device for high-temperature steel slag, which comprises: the device comprises a crushing bed (2), a closed cover (3), a crusher (8), a bottom blowing air cooling box (6), an ash collecting bin (13), a slag extractor (22), a hot stuffy tank (23) and a flue gas waste heat recovery system; the crushing bed (2) comprises a cold slag cushion layer (4) and a grate plate (5), wherein the cold slag cushion layer (4) is arranged above the grate plate (5); the closed cover (3) is arranged above the crushing bed (2); the closed cover (3) comprises a slag pouring port (10), a slag discharging port (11) and a large slag outlet (12), wherein the slag pouring port (10) is arranged above the closed cover (3) and is used for pouring high-temperature steel slag (7) onto a cold slag cushion layer (4) of the crushing bed (2) through the slag pouring port (10); the slag discharging port (11) is arranged below one side of the closed cover (3) far away from the slag pouring port (10), and the massive slag outlet (12) is arranged right ahead one side of the closed cover (3) close to the slag pouring port (10); the crusher (8) is positioned above the crushing bed (2) and is used for stirring and crushing the high-temperature steel slag (7); the bottom blowing cold box (6) is arranged below the grate plate (5) and is used for air-cooling the high-temperature steel slag (7) by introducing cold air through the grate plate (5) and the cold slag cushion layer (4); the ash collecting bin (13) is arranged at the lower side of the bottom blowing cold box (6) and is used for collecting steel slag particles falling through the grate plate (5); the slag extractor (22) can reciprocate between the lower side of the slag discharging port (11) and the hot stuffy tank (23) and is used for transferring the steel slag discharged from the slag discharging port (11) into the hot stuffy tank (23) for hot stuffy treatment; the flue gas waste heat recovery system is connected to the upper part of the closed cover (3) and used for recovering flue gas waste heat generated by air cooling and crushing of the high-temperature steel slag and then discharging the flue gas waste heat.
The flue gas waste heat recovery system comprises a hot air pipe (16), a heat exchanger (17), a generator (18), a dust remover (19), an induced draft fan (20) and a chimney (21); the one end of hot-blast main (16) is connected with the upper portion of inclosed cover (3), the other end and the heat exchanger (17) of hot-blast main (16) are connected, a flue gas for sending into heat exchanger (17) with the broken production of high temperature slag forced air cooling carries out the heat transfer, generator (18) are connected in heat exchanger (17), a saturated steam drive generator (18) electricity generation for producing after the heat transfer, heat exchanger (17) still pass through pipe connection dust remover (19), a flue gas for sending into dust remover (19) after the heat transfer removes dust, chimney (21) are connected through draught fan (20) in dust remover (19), a flue gas for discharging after will removing dust is arranged outward.
3. The bottom-blowing air-cooling crushing waste heat recovery device for the high-temperature steel slag according to claim 2, further comprising a control system (24), wherein the control system (24) is respectively and controllably connected with the deslagging port (10), the slag discharging port (11), the large slag outlet (12), the crusher (8), the air-cooling crushing box (6), the slag discharging machine (22), the hot stuffy tank (23) and the flue gas waste heat recovery system.
The high-temperature steel slag bottom blowing air cooling crushing waste heat recovery device further comprises a cold air pipe (15) and an air blower (14), and the bottom blowing cold box (6) is connected with the air blower (14) through the cold air pipe (15).
The high-temperature steel slag bottom blowing air cooling crushing waste heat recovery device further comprises a slag tank (1), wherein the slag tank (1) is movably arranged above the closed cover (3) and is used for pouring the high-temperature steel slag in the slag tank (1) onto a cold slag cushion layer (4) of the crushing bed (2) through a slag pouring port (10).
Wherein the crusher (8) moves back and forth along a track (27) arranged at the bottom of the crushing bed (2) through a walking mechanism at the bottom of the crusher; the running mechanism comprises wheels (25).
The crusher (8) comprises a driving motor (26), wherein the driving motor (26) is arranged on one side of the crusher (8) and is used for enabling the crusher (8) to rotate so as to crush the steel slag; the crusher (8) can realize the rotation in the positive and negative directions through the driving motor (26), the positive rotation can push the steel slag to move towards the slag discharging opening (11), and the negative rotation can push the steel slag to move towards the large slag outlet (12).
The crusher (8) further comprises crushing teeth (9), the crushing teeth (9) are uniformly arranged on the shaft of the crusher (8), and 3-9 crushing teeth (9) can be arranged in every 360 degrees in the circumferential direction; the included angle between two adjacent crushing teeth (9) is 40-120 degrees; the material of the crusher (8) and the crushing teeth (9) is heat-resistant alloy steel.
Wherein, slag pouring hole (10) internal diameter is not less than 2000mm, slag pouring hole (10) are opened through the pulley mode and are used for pouring the sediment, unload sediment mouth (11) and adopt hydraulic pressure mode to open and be used for unloading the sediment to mucking machine (22), and bold sediment export (12) adopt hydraulic pressure mode to open and are used for pushing out broken bed (2) through breaker (8) with the bold slag that is difficult to the breakage.
The thickness of the grate plate (5) is not less than 20mm, the grate plate (5) is provided with plate holes (30), and the gap width of the plate holes (30) is 5-40 mm; a cold slag cushion layer (4) is arranged above the grate plate (5) and is used for insulating heat of the high-temperature steel slag (7) so as to protect the grate plate (5) from high-temperature deformation, and the thickness of the cold slag cushion layer (4) is not less than 50 mm.
The heat insulation plate (28) is arranged on the outer side of the crusher (8) along the advancing direction of the rail (27), the retaining wall (29) is arranged on the outer side of the crushing bed (2), and a blower (14) provides cold air between the heat insulation plate (28) and the retaining wall (29) to carry out air cooling protection on a travelling mechanism of the crusher (8).
Wherein the cable inside the enclosure (3) is provided with cable armour to protect the power supply; the closed cover (3), the heat insulation plate (28), the hot air pipe (16) and the heat exchanger (17) are subjected to heat insulation treatment by adopting inorganic heat insulation cotton.
Preferably, the present invention relates to a high temperature steel slag bottom blowing air cooling crushing waste heat recovery system device, which comprises: the device comprises a slag tank, a crushing bed, a closed cover, a crusher, a bottom blowing cold box, a hot stuffy tank, a flue gas waste heat recovery system and a control system. The crushing bed comprises a cold slag cushion layer and a grate plate, and the cold slag cushion layer is arranged above the grate plate; the closed cover is placed above the crushing bed; the closed cover comprises a slag pouring port, a slag discharging port and a large slag outlet, the slag pouring port is arranged above the closed cover, the slag discharging port is arranged below one side of the closed cover, which is far away from the slag pouring port, and the large slag outlet is arranged right ahead of one side, which is close to the slag pouring port; the bottom blowing air cooling box is arranged below the grate plate, and the ash collecting bin is arranged at the lower side of the bottom blowing air cooling box; the bottom blowing cold box is connected with the air blower through a cold air pipe; the slag receiving machine is arranged at the lower side of the slag discharging opening; the flue gas waste heat recovery system part is positioned at the upper part of the closed cover and is used for generating power and utilizing flue gas generated by air-cooling and crushing high-temperature steel slag and then discharging the flue gas in an organized manner; the control system is respectively connected with a slag pouring port, a slag discharging port, a large slag outlet, a crusher, an air-cooled crushing box, a slag discharging machine, a hot stuffy tank and a flue gas waste heat treatment system; the control system is used for starting the slag extractor to be conveyed out from the lower part of the slag discharging port, and the slag is poured into the hot stuffy tank through the crown block to be subjected to hot stuffy treatment.
The flue gas waste heat recovery system comprises a hot air pipe, a heat exchanger, a generator, a dust remover, an induced draft fan and a chimney; the heat exchanger, the generator, the dust remover, the induced draft fan and the chimney are sequentially connected by a pipeline; the hot air pipe is connected with the upper part of the closed cover.
Wherein the ash collecting bin is used for collecting steel slag particles falling through the grate plate; the control system is a PLC control system; the air blower and the induced draft fan are variable frequency induced draft fans; the driving device is a motor arranged on one side of the crusher and used for rotary crushing of the crusher.
Wherein, the inner diameter of the slag pouring hole is not less than 2000 mm. The crusher can realize the rotation in the positive and negative directions through a motor of the driving device, the positive rotation of the motor can push the steel slag to move towards the slag discharging opening, and the negative rotation of the motor can push the steel slag to move towards the outlet direction of the large slag.
Wherein, the material of the crusher and the crushing teeth is heat-resistant alloy steel. The crushing teeth are uniformly arranged on the crusher shaft, and 3-9 crushing teeth can be arranged in every 360 degrees; the included angle between two adjacent crushing teeth is 40-120 degrees.
The crusher is positioned above the crushing bed and moves back and forth along the track at the bottom of the crushing bed under the drive of a motor through wheels at the bottom of the crusher.
The slag pouring port is opened in a reciprocating mode on the upper portion of the closed cover by adopting a pulley and used for pouring slag, the slag discharging port is opened in a hydraulic mode and used for discharging slag to a slag discharging machine, and the large slag outlet is opened in a hydraulic mode and used for pushing out the solid waste steel slag which is difficult to crush by using large blocks to form a crushing bed.
The cable in the closed cover is provided with a cable armor for protection and power supply; the closed cover, the heat insulation plate, the hot air pipe and the heat exchanger adopt inorganic heat insulation cotton for heat insulation treatment; the heat insulation plate is arranged on the outer side of the crusher along the track traveling direction, and a blower provides cold air to protect the crusher traveling mechanism between the heat insulation plate and the retaining wall on the outer side of the crushing bed.
The thickness of the grid plate is not less than 20mm, the grid plate is provided with plate holes, and preferably, the width of a plate hole gap is 5-40 mm; a cold slag cushion layer is arranged above the grate plate to protect the grate plate from high-temperature deformation by insulating high-temperature steel slag, and the thickness of the cold slag cushion layer is not less than 50 mm.
Preferably, the invention also relates to a method for recovering the air-cooled crushing waste heat of the high-temperature steel slag by bottom blowing, and the method for recovering the air-cooled crushing waste heat of the high-temperature steel slag by adopting the device for recovering the bottom-blowing air-cooled crushing waste heat of the high-temperature steel slag preferably comprises the following steps:
(1) opening a slag pouring port on the closed cover through a control system, closing a slag discharging port and a large slag outlet, lifting a slag pot filled with high-temperature steel slag to a crushing bed through a crane, and enabling the high-temperature steel slag to fall onto a cold slag cushion layer;
(2) starting an air blower through a control system to blow cold air into a bottom blowing air box through a cold air pipe, and further performing air cooling on the high-temperature steel slag through a grate plate and a cold slag cushion layer; simultaneously starting the crusher, stirring and crushing the high-temperature steel slag by adopting crushing teeth through the reciprocating motion of the crusher along the rail, and carrying out strong convection heat exchange on the bottom blowing cold air and the high-temperature steel slag in the stirring and crushing process;
(3) while blast cooling, starting the heat exchanger, the generator and the induced draft fan through a control system, sending high-temperature flue gas obtained by heat exchange of high-temperature steel slag into the heat exchanger through a hot air pipe, and generating electricity by using the generator for saturated steam generated by the heat exchanger; the flue gas cooled by the heat exchanger is discharged out in an organized way through a dust remover, a draught fan and a chimney;
(4) after the temperature of the high-temperature steel slag is changed by cold air and reduced to a certain temperature, a crusher is started through a control system to push the steel slag to a slag discharging port, the slag discharging port is opened, a slag discharging machine is used for conveying the cooled steel slag out of the lower part of the slag discharging port, and the steel slag is hoisted to a hot stuffy tank by a crane to be subjected to hot stuffy treatment.
Preferably, upon operation of the crusher, ash will be collected
Wherein, the slag pouring time of a single slag pot is 2-6 minutes, and the crushing time is 10-60 minutes. The rotating speed of the crusher is 3-15 r/min, the steel slag treatment rate can be increased by increasing the rotating speed of the crusher, and otherwise, the steel slag treatment rate is reduced. The cooling blast volume of the steel slag is 1000-4000m3The temperature of the steel slag at the slag discharging port can be reduced by increasing the blast volume, otherwise, the temperature of the steel slag at the slag discharging port is increased. The slag discharging temperature of the steel slag at the slag discharging port is controlled to 400-1200 ℃, the primary cooling, solidification and crushing of the steel slag can be realized, and certain heat can be reserved for subsequent hot smoldering. After the steel slag is crushed, the particle size is<The steel slag with the thickness of 50mm exceeds 70 percent.
Wherein, the blower provides high-temperature steel slag cooling gas as normal temperature air, the temperature of high-temperature flue gas obtained by the cooling and heat exchange of the high-temperature steel slag is 250-plus 500 ℃, the temperature of the high-temperature flue gas is reduced to below 200 ℃ by the heat exchange of a heat exchanger, and then the high-temperature flue gas is orderly discharged by a dust remover, a draught fan and a chimney in an organized manner, and the concentration of dust in the discharged flue gas is lower than 10mg3(ii) a Saturated steam obtained by heat exchange of the high-temperature flue gas through the heat exchanger is used for generating power, and the power generation capacity per ton of steel slag is 10-40 kWh.
The crusher crushes the high-temperature steel slag, the blower blows air to cool the high-temperature steel slag, and the crusher, the heat exchanger, the generator, the dust remover, the draught fan and the chimney are carried out simultaneously.
The control system is a PLC control system, and the PLC control system is used for controlling the slag pouring port, the slag discharging port, the opening of a large slag outlet, the starting and running speed adjustment of a crusher motor, the starting and air volume adjustment of an air blower, the starting and water volume adjustment of a heat exchanger, the starting of a generator, the starting and air volume adjustment of an induced draft fan, the opening of a slag extractor and the opening of a hot stuffy tank.
The device and the method have the advantages that the air-cooled crushing and waste heat recovery treatment of the high-temperature steel slag are realized, and the PLC remote control is adopted, so that the device and the method have the advantages of high automation degree, high waste heat recovery utilization rate, high treatment efficiency, high steel slag pulverization rate, small space occupation, low system investment, standard environmental emission, convenience in production and operation and the like. The method and the device greatly improve the level of steel slag crushing treatment, improve the steel slag treatment efficiency, break through the difficult problem of steel slag waste heat recycling, increase the comprehensive utilization benefit of the steel slag and effectively reduce the production and operation cost of the steel slag.
The invention adopts a crushing bed as a high-temperature steel slag treatment carrier, adopts a crusher to efficiently crush the steel slag, adopts a bottom blowing air box to carry out air cooling on the high-temperature steel slag, and adopts a heat exchanger and a generator to recycle the waste heat of the high-temperature steel slag for power generation. Pouring high-temperature steel slag into a crushing bed, simultaneously introducing cold air into the bottom of the crushing bed to carry out air cooling solidification and cooling on the steel slag, and rotating the crusher at a certain speed to crush the steel slag and simultaneously realize the slag pushing effect. The device has high crushing capacity, greatly improves the treatment efficiency of the steel slag, and can recover waste heat to generate power by obtaining high-temperature flue gas through air cooling heat exchange in the crushing process. The process equipment can realize 10-40kWh of power generation per ton of slag, and has remarkable waste heat recovery economic benefit. After the steel slag is crushed<The proportion of the steel slag with the thickness of 50mm is up to more than 70 percent, and the pulverization rate of the steel slag is obviously improved. Cooling the high-temperature flue gas after heat exchange, discharging the high-temperature flue gas in an organized manner through a dust remover, wherein the smoke dust discharge concentration is lower than 10mg/m3. The invention has the advantages that the device and the method realize the high-efficiency crushing and waste heat recovery of the high-temperature steel slag, the device of a steel slag water cooling system is cancelled, the traditional wet flue gas treatment system caused by a water cooling process is replaced by a simple dry dedusting mode, and the invention has the advantages of high automation degree, small space occupation, good tightness, low system investment, ultra-clean emission and the like, greatly improves the comprehensive economic benefit of steel slag treatment, and has obvious technical and market competitiveness.
Drawings
FIG. 1 is a schematic view of a bottom-blowing air-cooled crushing waste heat recovery system for high-temperature steel slag.
FIG. 2 is a sectional view of a high-temperature steel slag bottom-blowing air-cooling crushing waste heat recovery system device.
FIG. 3 is a schematic view of a grate plate of a steel slag crushing bed.
Detailed Description
A high temperature steel slag bottom blowing air cooling crushing waste heat recovery system device is shown in figure 1, figure 2 and figure 3, the high temperature steel slag bottom blowing air cooling crushing waste heat recovery system device comprises: the device comprises a slag pot 1, a crushing bed 2, a closed cover 3, a crusher 8, a bottom blowing air cooling box 6, a hot stuffy pot 23, a flue gas waste heat recovery system and a control system 24. The crushing bed 2 comprises a cold slag cushion layer 4 and a grate plate 5, wherein the cold slag cushion layer 4 is arranged above the grate plate 5; the closed hood 3 is placed above the crushing bed 2; the closed cover 3 comprises a slag pouring port 10, a slag discharging port 11 and a large slag outlet 12, wherein the slag pouring port 10 is arranged above the closed cover 3, the slag discharging port 11 is arranged below one side of the closed cover 3 far away from the slag pouring port 10, and the large slag outlet 12 is arranged right ahead of one side close to the slag pouring port 10; the bottom blowing air cooling box 6 is arranged below the grate plate 5, and the ash collecting bin 13 is arranged at the lower side of the bottom blowing air cooling box; the bottom blowing cold box 6 is connected with an air blower 14 through a cold air pipe 15; the slag receiving machine 22 is arranged at the lower side of the slag discharging opening 11; the flue gas waste heat recovery system part is positioned at the upper part of the closed cover 3 and is used for generating power and discharging organized smoke gas generated by air-cooling and crushing high-temperature steel slag; the control system 24 is respectively connected with the slag pouring hole 10, the slag discharging hole 11, the large slag outlet 12, the crusher 8, the air-cooled crushing box 6, the slag discharging machine 22, the hot stuffy tank 23 and the flue gas waste heat treatment system; the control system 24 is used for starting the slag extractor 22 to be transported out from the lower part of the slag discharging port 11, and the slag is poured into the hot stuffy tank 23 by a crown block to be subjected to hot stuffy treatment.
The flue gas waste heat recovery system comprises a hot air pipe 16, a heat exchanger 17, a generator 18, a dust remover 19, an induced draft fan 20 and a chimney 21; the heat exchanger 17, the generator 18, the dust remover 19, the induced draft fan 20 and the chimney 21 are sequentially connected by pipelines; the hot air duct 16 is connected to the upper part of the closed cover 3. The ash collecting bin 13 is used for collecting steel slag particles falling through the grate plate 5; the control system 24 is a PLC control system; the blower 14 and the induced draft fan 20 are variable frequency induced draft fans; the drive means is a motor 26 on the side of the crusher 8 for rotary crushing of the crusher. The inner diameter of the slag pouring hole 13 is not less than 2000 mm. The crusher 8 can realize the rotation in the positive and negative directions through the motor 18 of the driving device, the positive rotation of the motor 18 can push the steel slag to move towards the slag discharging opening 11, and the negative rotation can push the steel slag to move towards the large slag outlet 12. The material of the crusher 8 and the crushing teeth 9 is heat-resistant alloy steel. The crushing teeth 9 are uniformly arranged on the shaft of the crusher 8, and 3-9 crushing teeth 9 can be arranged in every 360 degrees; the included angle between two adjacent crushing teeth 9 is 40-120 degrees. The crusher 8 is located above the crushing bed 2 and the crusher 8 is driven by its bottom wheels 25 by a motor to move back and forth along the bottom rails 27 of the crushing bed 2. The slag pouring port 10 is opened in a mode that a pulley moves back and forth on the upper portion of the closed cover 3 for pouring slag, the slag discharging port 11 is opened in a hydraulic mode for discharging slag to the slag discharging machine 22, and the large slag outlet 12 is opened in a hydraulic mode for pushing out the large solid waste steel slag which is difficult to break out of the breaking bed 2. A cable armor is arranged in the cable in the closed cover 3 for protection and power supply; the closed cover 3, the heat insulation plate 28, the hot air pipe 16 and the heat exchanger 17 are subjected to heat insulation treatment by adopting inorganic heat insulation cotton; the heat shield 28 is placed on the outer side of the crusher 8 in the traveling direction of the rail 27, and the running mechanism of the crusher 8 is protected by air cooling by the air blower 14 between the heat shield 28 and the retaining wall 29 on the outer side of the crushing bed 2. The thickness of the grid plate 5 is not less than 20mm, the grid plate 5 is provided with plate holes 30, and preferably, the width of gaps of the plate holes 30 is 5-40 mm; a cold slag cushion layer 4 is arranged above the grate plate 5 to protect the grate plate 5 from high-temperature deformation by insulating high-temperature steel slag 7, and the thickness of the cold slag cushion layer 4 is not less than 50 mm.
As shown in FIGS. 1-3, a method for recovering waste heat from bottom blowing air-cooled crushing of high-temperature steel slag by using the above device comprises the following steps: (1) opening a slag pouring port 10 on the closed cover 3 through a control system 24, closing a slag discharging port 11 and a large slag outlet 12, pouring the slag tank 1 filled with the high-temperature steel slag onto the crushing bed 2 by hoisting through a crane, and allowing the high-temperature steel slag 7 to fall onto the cold slag cushion layer 4; (2) the control system 24 starts the air blower 14 to blow cold air into the bottom blowing cold air box 16 through the cold air pipe 15, and then the high-temperature steel slag 7 is air-cooled through the grate plate 5 and the cold slag cushion layer 4; simultaneously starting the crusher 8, enabling the crusher 8 to reciprocate along the track 27, stirring and crushing the high-temperature steel slag 7 by using the crushing teeth 9, and carrying out strong convection heat exchange on bottom-blown cold air and the high-temperature steel slag 7 in the stirring and crushing process; (3) while blowing and cooling, starting the heat exchanger 17, the generator 18 and the draught fan 20 through the control system 24, sending high-temperature flue gas obtained by heat exchange of the high-temperature steel slag 7 into the heat exchanger 17 through the hot air pipe 16, and generating electricity by using the generator 18 for saturated steam generated by the heat exchanger 17; the flue gas cooled by the heat exchanger 17 is discharged out through a dust remover 19, a draught fan 20 and a chimney 21 in an organized manner; (4) after the temperature of the high-temperature steel slag 7 is reduced to a certain temperature through cold air exchange, the crusher 8 is started through the control system 24 to push the steel slag to the slag discharging port 11, the slag discharging port 11 is opened, the cooled steel slag is conveyed out from the lower part of the slag discharging port 11 through the slag discharging machine 22, and the cooled steel slag is hoisted to the hot stuffy tank 23 by a crane to be subjected to hot stuffy treatment.
Wherein, the slag pouring time of a single slag pot 1 is 2-6 minutes, and the crushing time is 10-60 minutes. The rotating speed of the crusher 3 is 3-15 r/min, the steel slag treatment rate can be increased by increasing the rotating speed of the crusher 3, and otherwise, the steel slag treatment rate is reduced. The cooling blast volume of the steel slag is 1000-4000m3The temperature of 11 steel slag at the slag discharging port can be reduced by increasing the blast volume, otherwise, the temperature of 11 steel slag at the slag discharging port is increased. The slag discharging temperature of the 11 steel slag at the slag discharging port is controlled to be 400-1200 ℃, so that the primary cooling, solidification and crushing of the steel slag can be realized, and certain heat can be reserved for subsequent hot smoldering. After the steel slag is crushed, the particle size is<The steel slag with the thickness of 50mm exceeds 70 percent. The blower 14 provides high-temperature steel slag cooling gas as normal-temperature air, the temperature of high-temperature flue gas obtained by cooling and heat exchange of the high-temperature steel slag 7 is 250-plus-500 ℃, the temperature of the high-temperature flue gas is reduced to be below 200 ℃ by heat exchange of the heat exchanger 17, and the high-temperature flue gas is orderly discharged by a dust remover 19, a draught fan 20 and a chimney 21 in sequence, and the concentration of dust in the discharged flue gas is lower than 10mg/m3(ii) a Saturated steam obtained by heat exchange of the high-temperature flue gas through the heat exchanger 17 is used for power generation, and the power generation capacity per ton of steel slag is 10-40 kWh. The crusher 8 crushes the high-temperature steel slag 7, the blower 14 blows air to cool the high-temperature steel slag 7, and the crusher 8, the heat exchanger 17, the generator 18, the dust remover 19, the induced draft fan 20 and the chimney 21 are carried out simultaneously. The control system is a PLC control system, and the PLC control system is used for controlling the opening of the slag pouring port 10, the slag discharging port 11, the opening of the large slag outlet 12, the starting and running speed adjustment of the motor 26 of the crusher 8, the starting and air volume adjustment of the blower 14, the opening and water volume adjustment of the heat exchanger 17, the opening of the generator 18, the opening and air volume adjustment of the draught fan 10 and the opening of the slag discharging machine 22 and the hot stuffy tank 23.
Claims (16)
1. The utility model provides a broken waste heat recovery unit of air-cooled of high temperature steel slag bottom blowing which characterized in that, broken waste heat recovery unit of air-cooled of high temperature steel slag bottom blowing includes: the device comprises a crushing bed (2), a closed cover (3), a crusher (8), a bottom blowing air cooling box (6), an ash collecting bin (13), a slag extractor (22), a hot stuffy tank (23) and a flue gas waste heat recovery system; the crushing bed (2) comprises a cold slag cushion layer (4) and a grate plate (5), wherein the cold slag cushion layer (4) is arranged above the grate plate (5); the closed cover (3) is arranged above the crushing bed (2); the closed cover (3) comprises a slag pouring port (10), a slag discharging port (11) and a large slag outlet (12), wherein the slag pouring port (10) is arranged above the closed cover (3) and is used for pouring high-temperature steel slag (7) onto a cold slag cushion layer (4) of the crushing bed (2) through the slag pouring port (10); the slag discharging port (11) is arranged below one side of the closed cover (3) far away from the slag pouring port (10), and the massive slag outlet (12) is arranged right ahead one side of the closed cover (3) close to the slag pouring port (10); the crusher (8) is positioned above the crushing bed (2) and is used for stirring and crushing the high-temperature steel slag (7); the bottom blowing cold box (6) is arranged below the grate plate (5) and is used for air-cooling the high-temperature steel slag (7) by introducing cold air through the grate plate (5) and the cold slag cushion layer (4); the ash collecting bin (13) is arranged at the lower side of the bottom blowing cold box (6) and is used for collecting steel slag particles falling through the grate plate (5); the slag extractor (22) can reciprocate between the lower side of the slag discharging port (11) and the hot stuffy tank (23) and is used for transferring the steel slag discharged from the slag discharging port (11) into the hot stuffy tank (23) for hot stuffy treatment; the flue gas waste heat recovery system is connected to the upper part of the closed cover (3) and used for recovering flue gas waste heat generated by air cooling and crushing of the high-temperature steel slag and then discharging the flue gas waste heat.
2. The bottom blowing air cooling crushing waste heat recovery device for high-temperature steel slag according to claim 1, wherein the flue gas waste heat recovery system comprises a hot air pipe (16), a heat exchanger (17), a generator (18), a dust remover (19), an induced draft fan (20) and a chimney (21); the one end of hot-blast main (16) is connected with the upper portion of inclosed cover (3), the other end and the heat exchanger (17) of hot-blast main (16) are connected, a flue gas for sending into heat exchanger (17) with the broken production of high temperature slag forced air cooling carries out the heat transfer, generator (18) are connected in heat exchanger (17), a saturated steam drive generator (18) electricity generation for producing after the heat transfer, heat exchanger (17) still pass through pipe connection dust remover (19), a flue gas for sending into dust remover (19) after the heat transfer removes dust, chimney (21) are connected through draught fan (20) in dust remover (19), a flue gas for discharging after will removing dust is arranged outward.
3. The bottom-blowing air-cooling crushing waste heat recovery device for the high-temperature steel slag according to claim 2, further comprising a control system (24), wherein the control system (24) is respectively and controllably connected with the deslagging port (10), the slag discharging port (11), the large slag outlet (12), the crusher (8), the air-cooling crushing box (6), the slag discharging machine (22), the hot stuffy tank (23) and the flue gas waste heat recovery system.
4. The high-temperature steel slag bottom-blowing air-cooling crushing waste heat recovery device as claimed in one of claims 1 to 3, wherein the high-temperature steel slag bottom-blowing air-cooling crushing waste heat recovery device further comprises a cold air pipe (15) and an air blower (14), and the bottom-blowing air cooling box (6) is connected with the air blower (14) through the cold air pipe (15).
5. The high-temperature steel slag bottom-blowing air-cooling crushing waste heat recovery device as claimed in one of claims 1 to 3, wherein the high-temperature steel slag bottom-blowing air-cooling crushing waste heat recovery device further comprises a slag pot (1), and the slag pot (1) is movably arranged above the closed cover (3) and is used for pouring the high-temperature steel slag in the slag pot (1) onto the cold slag cushion layer (4) of the crushing bed (2) through the slag pouring port (10).
6. A device according to any one of claims 1-3, characterized in that the crusher (8) is moved to and fro by means of its bottom running gear along a rail (27) arranged at the bottom of the crushing bed (2); the running mechanism comprises wheels (25).
7. The bottom-blowing air-cooling crushing waste heat recovery device for high-temperature steel slag according to claim 6, wherein the crusher (8) comprises a driving motor (26), the driving motor (26) is arranged on one side of the crusher (8) and is used for enabling the crusher (8) to rotate to crush the steel slag; the crusher (8) can realize the rotation in the positive and negative directions through the driving motor (26), the positive rotation can push the steel slag to move towards the slag discharging opening (11), and the negative rotation can push the steel slag to move towards the large slag outlet (12).
8. The high-temperature steel slag bottom blowing air cooling crushing waste heat recovery device as claimed in claim 7, wherein the crusher (8) further comprises crushing teeth (9), the crushing teeth (9) are uniformly arranged on the shaft of the crusher (8), and 3-9 crushing teeth (9) can be arranged in the circumferential direction at every 360 degrees; the included angle between two adjacent crushing teeth (9) is 40-120 degrees; the material of the crusher (8) and the crushing teeth (9) is heat-resistant alloy steel.
9. A high-temperature steel slag bottom blowing air cooling crushing waste heat recovery device as claimed in one of claims 1 to 3, characterized in that the inner diameter of the slag pouring hole (10) is not less than 2000mm, the slag pouring hole (10) is opened in a pulley mode for slag pouring, the slag discharging hole (11) is opened in a hydraulic mode for slag discharging to the slag discharging machine (22), and the large slag outlet (12) is opened in a hydraulic mode for pushing large steel slag which is difficult to crush out of the crushing bed (2) through the crusher (8).
10. The high-temperature steel slag bottom blowing air cooling crushing waste heat recovery device as claimed in one of claims 1 to 3, wherein the thickness of the grid plate (5) is not less than 20mm, the grid plate (5) is provided with plate holes (30), and the gap width of the plate holes (30) is 5-40 mm; a cold slag cushion layer (4) is arranged above the grate plate (5) and is used for insulating heat of the high-temperature steel slag (7) so as to protect the grate plate (5) from high-temperature deformation, and the thickness of the cold slag cushion layer (4) is not less than 50 mm.
11. A high temperature steel slag bottom blowing air cooling crushing waste heat recovery device as claimed in one of claims 1 to 3, characterized in that the heat insulation board (28) is arranged at the outer side of the crusher (8) along the traveling direction of the rail (27), the retaining wall (29) is arranged at the outer side of the crushing bed (2), and the air cooling protection is provided for the traveling mechanism of the crusher (8) by the air blower (14) between the heat insulation board (28) and the retaining wall (29).
12. The bottom blowing air cooling crushing waste heat recovery device for high temperature steel slag according to claim 11, wherein a cable armor is arranged on a cable in the closed cover (3) to protect power supply; the closed cover (3), the heat insulation plate (28), the hot air pipe (16) and the heat exchanger (17) are subjected to heat insulation treatment by adopting inorganic heat insulation cotton.
13. A method for recovering waste heat of bottom-blowing air-cooling crushing of high-temperature steel slag, preferably a method for recovering waste heat of air-cooling crushing of high-temperature steel slag by using the device for recovering waste heat of bottom-blowing air-cooling crushing of high-temperature steel slag according to any one of claims 1 to 12, comprising the following steps:
(1) opening a slag pouring port (10) on the closed cover (3) through a control system (24), closing a slag discharging port (11) and a large slag outlet (12), pouring a slag tank (1) filled with high-temperature steel slag onto the crushing bed (2) by hoisting and conveying through a crane, and allowing the high-temperature steel slag (7) to fall onto the cold slag cushion layer (4);
(2) starting an air blower (14) through a control system (24), blowing cold air into a bottom blowing cold air box (16) through a cold air pipe (15), and further performing air cooling on the high-temperature steel slag (7) through a grate plate (5) and a cold slag cushion layer (4); simultaneously starting the crusher (8), enabling the crusher (8) to reciprocate along the track (27), stirring and crushing the high-temperature steel slag (7) through crushing teeth (9) on the crusher (8), and carrying out strong convection heat exchange on bottom-blown cold air and the high-temperature steel slag (7) in the stirring and crushing process;
(3) when blast cooling is carried out, a heat exchanger (17), a generator (18) and a draught fan (20) of a flue gas waste heat recovery system are started through a control system (24), high-temperature flue gas obtained through heat exchange of high-temperature steel slag (7) is sent into the heat exchanger (17) through a hot air pipe (16), and saturated steam generated by the heat exchanger (17) drives the generator (18) to generate electricity; the flue gas cooled by the heat exchanger (17) is discharged outside through a dust remover (19), an induced draft fan (20) and a chimney (21) of a flue gas waste heat recovery system;
(4) after the temperature of the high-temperature steel slag (7) is reduced to a certain temperature through cold air exchange, a crusher (8) is started through a control system (24) to push the steel slag to a slag discharging port (11), the slag discharging port (11) is opened, the cooled steel slag is conveyed out from the lower part of the slag discharging port (11) through a slag discharging machine (22), and the cooled steel slag is hoisted to a hot stuffy tank (23) by a crane to be subjected to hot stuffy treatment.
14. According toThe method of claim 13, characterized in that the deslagging time of the single slag pot (1) is 2-6 minutes, and the crushing treatment time is 10-60 minutes; preferably, the rotating speed of the crusher (8) is 3-15 r/min, and the steel slag treatment speed can be increased by increasing the rotating speed of the crusher (8), and conversely, the steel slag treatment speed can be reduced. Preferably, the cooling blast volume of the steel slag is 1000-3Per ton of steel slag, the temperature of the steel slag at the slag discharging port (11) can be reduced by increasing the blast volume, and conversely, the temperature of the steel slag at the slag discharging port (11) is increased. Preferably, the slag discharging temperature of the steel slag at the slag discharging port (11) is controlled to be 400-. Preferably, the steel slag has a particle size after being crushed<The steel slag with the thickness of 50mm exceeds 70 percent.
15. The method as set forth in one of claims 13 to 14, wherein the high temperature steel slag cooling gas provided by the blower (14) is normal temperature air, the temperature of the high temperature flue gas obtained by cooling and heat exchanging the high temperature steel slag (7) is 250-3(ii) a The saturated steam obtained by heat exchange of the high-temperature flue gas through the heat exchanger (17) generates electricity, and the generating capacity of each ton of steel slag is 10-40 kWh.
16. The method as claimed in one of claims 13 to 15, characterized in that the control system is a PLC control system, and the opening of the deslagging port (10), the slag discharge port (11) and the large slag outlet (12) is controlled by the PLC control system, and the starting and running speed adjustment of the motor (26) of the crusher (8), the starting and air volume adjustment of the blower (14), the starting and water volume adjustment of the heat exchanger (17), the starting of the generator (18), the starting and air volume adjustment of the draught fan (10), the opening of the slag discharging machine (22) and the opening of the hot stuffer tank (23) are controlled.
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| CN112899416A (en) * | 2021-03-17 | 2021-06-04 | 中冶节能环保有限责任公司 | Method for utilizing waste heat of steel slag |
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| CN113684328A (en) * | 2021-08-17 | 2021-11-23 | 刘春茗 | Dry type treatment equipment for foam slag and working mode thereof |
| CN114262761A (en) * | 2021-12-16 | 2022-04-01 | 北京崎基环保科技有限公司 | Short-flow integrated treatment system and treatment method for steel slag |
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| CN114058746A (en) * | 2022-01-17 | 2022-02-18 | 中冶节能环保有限责任公司 | Steel slag crushing treatment system and method |
| CN114891934A (en) * | 2022-04-29 | 2022-08-12 | 刘春茗 | Steel slag roller type crushing, air quenching and cooling dry processing device and working method thereof |
| CN114891934B (en) * | 2022-04-29 | 2024-05-31 | 刘春茗 | Steel slag roller type crushing, air quenching and cooling dry treatment device and working method thereof |
| CN115505655A (en) * | 2022-09-29 | 2022-12-23 | 一重集团大连工程技术有限公司 | Thermal state steel slag crushing equipment and thermal braising treatment system |
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| CN115627304A (en) * | 2022-10-26 | 2023-01-20 | 中冶节能环保有限责任公司 | Efficient wind-crushing waste heat recovery method and device for molten electric furnace slag |
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