CN210154354U - Direct heat extraction method high temperature slag waste heat recycling system - Google Patents
Direct heat extraction method high temperature slag waste heat recycling system Download PDFInfo
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Abstract
The utility model discloses a direct heat extraction method high temperature sediment waste heat recovery utilizes system, including high temperature sediment storehouse, heat extraction storehouse, sedimentation tank and working medium storage pond, high temperature sediment storehouse bottom sets up the feed cinder notch, the feed cinder notch sets up the feed sediment ware, the feed cinder notch is connected with the heat extraction storehouse, heat extraction storehouse top sets up into cinder notch and steam outlet, and upper portion sets up high-pressure working medium import, and the bottom sets up the row cinder notch, the steam outlet is connected with the heat consumption unit, the cold working medium export of the heat consumption unit is connected with the working medium storage pond, the row cinder notch sets up row sediment ware, the row cinder notch is connected with the sedimentation tank, the sedimentation tank is connected with the working medium storage pond; the system is suitable for recovering sensible heat carried by high-temperature waste slag such as powdery or fine-grained slag, reducing slag and the like in the industrial production process, can improve the energy utilization efficiency, can reduce thermal pollution, indirectly reduces the emission of waste gas such as carbon dioxide, sulfur dioxide and the like, and has good social and economic values and environmental values.
Description
Technical Field
The utility model relates to a direct heat extraction method high temperature sediment waste heat recovery utilizes system belongs to chemical industry waste heat recovery and utilizes technical field.
Background
High-temperature slag, reducing slag and the like discharged by the metallurgy and energy industries such as thermal power plant boilers, iron-making blast furnaces, silicothermic reduction of metal magnesium, aluminothermic reduction of metal calcium and the like have the highest temperature of 1600 ℃, carry a large amount of sensible heat, and cause extreme waste of energy if the waste heat is not recycled or is not properly recycled. Taking the silicothermic reduction of magnesium metal as an example, for every 1 ton of magnesium metal produced, about 5.5 tons of reduced magnesium slag are produced, leaving the reduction tank at a temperature of about 1200 ℃. And calculating by professor Chengjinqing of Jiangxi Ringchang university, and in the temperature range of 1200-25 ℃, the specific heat capacity of the reduced magnesium slag is about 871J/kg, namely, the reduced magnesium slag generated by producing 1 ton of metal magnesium is cooled from 1200 ℃ to 25 ℃, and the released sensible heat is equivalent to the heat released by burning about 192.5kg of standard coal. The annual yield of magnesium smelting by a silicothermic method in China is calculated according to 90 ten thousand tons at present, the utilization rate of the waste heat of the reduced magnesium slag is calculated according to 60%, the recovered waste heat is equivalent to the heat released by burning about 10.5 ten thousand tons of standard coal, and meanwhile, the emission of harmful substances such as carbon dioxide, sulfur dioxide, dust and the like is reduced, so that the method has great economic value and great social and environmental protection values.
At present, in the industry, for the treatment of the reduced magnesium slag, one is to utilize cooling water to spray and cool the hot reduced magnesium slag through a slag cooler and generate a small amount of hot water and steam at the same time. The slag cooler has the disadvantages that the slag cooler belongs to a semi-open motion type system, the sealing of the system is difficult to realize, the hot water separation and the collection of water vapor are difficult to realize, and the available value is not high. The other is through a waste heat boiler, and the defects are that the device is static heat transfer, the heat transfer efficiency is low, and the processing capacity is limited. The third is a tubular heat exchanger, which utilizes gravity to lead the reduced magnesium slag to fall from top to bottom, and the reduced magnesium slag passes through the tubular heat exchanger to heat working medium water in the heat exchanger in the falling process.
To thermal power factory high temperature sediment, one kind is through the cooling slag of recirculated cooling water cooling, and the recirculated water goes into the cooling tower with the sediment surplus heat and discharges into the atmosphere, though solved the quick refrigerated problem of sediment, nevertheless, the sediment heat can not effectively be utilized, influences boiler thermal efficiency, and the front of a business over for the business of recirculated water also causes the waste of water resource to a certain extent moreover, also causes thermal pollution to the environment simultaneously. The second is to adopt a fluidized bed slag cooler, after high-temperature slag is cooled by a fluidizing agent (air or low-temperature flue gas), the low-temperature slag is discharged into a slag removal system, and the heated fluidizing agent carries a small amount of fine particles and is sent back to the hearth by an air return pipe.
Blast furnace slag is liquid when high temperature, and in the sensible heat release process, gradually cools down, can take place phase transition, solidification, if directly carry out heat recovery through the heat exchanger, can solidify, adhere to the heat exchanger on, so often through granulation in advance in order to obtain solid-state granule or thin slice earlier, carry out waste heat recovery. The typical process for sensible heat recovery of iron smelting blast furnace slag is introduced in 'blast furnace slag dry sensible heat recovery technology research progress' by Xuyongtong, etc. of the process engineering research institute of Chinese academy of sciences: several typical blast furnace slag sensible heat recovery processes, such as a cooling drum method slag flake solidification process, a continuous casting and rolling method slag flat solidification process, a mechanical stirring method slag granulation process, a rotating drum method slag granulation process, a Merotec slag granulation process, a wind-breaking method blast furnace slag sensible heat recovery process, a rotating cup granulation slag sensible heat recovery process and the like, have respective defects. For example, the waste heat recovery system is complex, the process is complex and difficult to control, and the like. By utilizing the high-temperature slag granulation process, a part of sensible heat and phase change heat from liquid to solid are dissipated.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned prior art is not enough, a direct extraction heat method high temperature sediment waste heat recovery utilizes system is provided, this system is suitable for but not limited to the recovery of the sensible heat that high temperature waste residue such as likepowder or particle slag, reduction slag carried among the thermal reduction method preparation magnesium, calcium, sodium, iron and other industrial production processes, can improve energy utilization efficiency, can reduce thermal pollution again, indirectly reduce the emission of waste gases such as carbon dioxide, sulfur dioxide, good society and economic value and environmental value have.
The utility model discloses a following technical scheme realizes:
a direct heat extraction method high-temperature slag waste heat recycling system, which comprises a high-temperature slag bin, a heat extraction bin, a sedimentation tank and a working medium storage tank,
the bottom of the high-temperature slag bin is provided with a slag feeding port, the slag feeding port is connected with a slag inlet of the heat extraction bin, the upper part of the heat extraction bin is provided with a high-pressure working medium inlet, the high-pressure working medium inlet is connected with a working medium storage pool, the bottom of the heat extraction bin is provided with a slag discharging port, the slag discharging port is connected with a sedimentation tank, and the sedimentation tank is connected with the working medium storage pool;
the high-temperature slag bin is built by refractory materials, a slag feeder is arranged in the bottom slag feeding port, a cooling water jacket is also arranged on the outer wall of the slag feeding port, and circulating cooling water is arranged in the cooling water jacket;
the heat extraction bin comprises a top slag inlet, a steam area positioned at the upper part, a steam outlet, a slag baffle and a heat extraction area positioned at the lower part, wherein the top of the heat extraction bin is provided with the slag inlet, the slag inlet is provided with a slag inlet pipe, the upper part of the heat extraction bin is provided with the steam outlet, the steam area at the upper part of the heat extraction bin is internally provided with the slag baffle, the slag baffle is positioned between the outlet of the slag inlet pipe and the steam outlet, the upper part of the heat extraction bin is provided with one or more high-pressure working medium inlets, the high-pressure working medium inlets are arranged at the upper part of the outlet of the slag inlet pipe, and the slag outlet at the bottom of the heat;
the sedimentation tank is a one-stage or multi-stage sedimentation tank, a cold slag outlet is arranged at the bottom of the sedimentation tank, an overflow port is arranged at the top of the sedimentation tank, and the overflow port is connected with a working medium storage tank;
the upper part of the working medium storage pool is provided with a high-pressure working medium inlet which is connected with the heat extraction bin through a working medium output pipeline and a high-pressure pump, and the working medium storage pool is also provided with a working medium supplement pipeline;
the hot inlet of the heat utilization unit is connected with the steam outlet, and the cold outlet is connected with the working medium storage pool.
The sedimentation tank is a one-stage or series-connected multi-stage sedimentation tank, and a cold slag outlet is formed in the bottom of the sedimentation tank;
when the sedimentation tank is a multi-stage sedimentation tank connected in series, the primary sedimentation tank is connected with a slag discharge port of the heat extraction bin, the top of the primary sedimentation tank is provided with an overflow port, the overflow port is connected with the secondary sedimentation tank, the top of the secondary sedimentation tank is provided with an overflow port connected with the next-stage sedimentation tank, and the overflow port of the last-stage sedimentation tank is connected with a working medium storage tank;
the upper part of the working medium storage pool is provided with a high-pressure working medium inlet which is connected with the heat extraction bin through a working medium output pipeline and a high-pressure pump, and the working medium storage pool is also provided with a working medium supplement pipeline.
And a filtering device is also arranged on the working medium output pipeline.
The heat utilization unit is a steam turbine and a heating radiator.
The slag baffle is of a single-layer or multi-layer screen structure.
The top of the heat extraction bin is also provided with a pressure sensor and a pressure relief safety valve.
And the primary sedimentation tank is also internally provided with a heat exchanger, and the heat exchanger is connected with a working medium output pipeline and used for preheating the working medium.
And the outer walls of the slag feeding port and the slag inlet are also provided with cooling water jackets, and circulating cooling water is arranged in the cooling water jackets.
Compared with the prior art, the beneficial effects of the utility model are that:
the system is suitable for but not limited to the preparation of magnesium, calcium, sodium, iron by a thermal reduction method and the recovery of sensible heat carried by high-temperature waste slag such as powdery or fine-grained slag, reducing slag and the like in other industrial production processes, can improve the energy utilization efficiency, can reduce thermal pollution, indirectly reduces the emission of waste gases such as carbon dioxide, sulfur dioxide and the like, and has good social and economic values and environmental values.
Drawings
Fig. 1 is a typical direct heat extraction process route diagram of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
In the figure, a high-temperature slag bin 1, a slag feeding port 2, a heat extraction bin 3, a primary sedimentation tank 4, a working medium storage tank 5, a slag feeding device 6, a slag inlet 7, a steam outlet 8, a high-pressure working medium inlet 9, a slag discharge port 10, a heat utilization unit 11, a cold working medium outlet 12, a working medium storage tank 13, a slag discharge device 14, a secondary sedimentation tank 15, a steam area 16, a slag baffle plate 17, a heat extraction area 18, a slag inlet pipe 19, a cold slag outlet 22, a working medium output pipeline 23, a high-pressure pump 24, a working medium supplement pipeline 25, a filtering device 26, a temperature measuring device 27, a heat exchanger 28, a cooling water jacket 29, a pressure sensor 31, a pressure relief safety valve 32, a heat extraction working medium 50 and slag 52.
Detailed Description
The invention is further illustrated below with reference to the following examples and drawings:
example 1
A high-temperature slag waste heat recycling system adopting a direct heat extraction method comprises a high-temperature slag bin 1, a heat extraction bin 3, a sedimentation tank and a working medium storage tank 5, wherein a slag feeding port 2 is formed in the bottom of the high-temperature slag bin 1, a slag feeding device 6 is arranged on the slag feeding port 2, the slag feeding port is connected with a slag inlet 7 of the heat extraction bin, a slag inlet 7 and a steam outlet 8 are formed in the top of the heat extraction bin, a high-pressure working medium inlet 9 is formed in the upper part of the heat extraction bin, a slag discharging port 10 is formed in the bottom of the heat extraction bin, the steam outlet 8 is connected with a heat using unit 11, a cold working medium outlet 12 of the heat using unit 11 is connected with the working medium storage tank 13, a slag discharging device 14 is arranged on the slag discharging port 10, the sedimentation tank is connected with the; the working medium in the system of the embodiment is water.
The slag feeder is connected with a slag inlet at the upper part of the heat extraction bin and is used for ensuring that high-temperature slag in the slag bin continuously and uniformly enters the heat extraction bin, and meanwhile, the sealing of the heat extraction bin can be realized, and the leakage of steam generated in the heat extraction bin is prevented.
The high-temperature slag bin 1 is built by refractory materials; the failure caused by the high temperature of the slag in the bin is avoided, and the loss of sensible heat carried by the high-temperature slag in the bin can be prevented. The method has the advantages that the high-temperature slag transported from the slag source is stored, and the working sustainability of the whole system is guaranteed.
The heat extraction bin 3 comprises working areas and components such as a top slag inlet 7, a steam area 16 positioned at the upper part, a steam outlet 8, a slag baffle 17, a heat extraction area 18 positioned at the lower part and the like, and is a place where working media and high-temperature slag perform heat extraction reaction and generate steam. The slag inlet 7 is provided with a slag inlet pipe 19, the upper part of the heat extraction bin 3 is provided with a steam outlet 8, a slag baffle 17 is arranged in a steam area on the upper part of the heat extraction bin, the slag baffle 17 is positioned between an outlet of the slag inlet pipe 19 and the steam outlet, and the slag baffle plays a role in blocking flying slag generated by raising dust at the slag inlet, so that steam is purified, and the steam is prevented from carrying slag. The upper part of the heat extraction bin is provided with one to a plurality of high-pressure working medium inlets, the high-pressure working medium inlets are arranged at the upper part of the outlet of the slag inlet pipe 19, the high-pressure working medium inlets 9 are provided with high-pressure nozzles, and a slag discharging port 10 at the bottom of the heat extraction bin 3 is provided with a slag discharger 14; the slag extractor is connected with a slag outlet at the lower part of the heat extraction bin, and is used for realizing sealing and pressure maintaining of the heat extraction bin while discharging slag.
The sedimentation tank is a one-stage or multi-stage sedimentation tank, the bottom of the sedimentation tank is provided with a cold slag outlet 22, the top of the sedimentation tank is provided with an overflow port, and the overflow port is connected with a working medium storage tank 13;
the sedimentation tank is a multi-stage sedimentation tank connected in series and is used for settling and separating a mixture of slag discharged from the heat extraction bin and the working medium. A cold slag outlet 22 is arranged at the bottom of the sedimentation tank; the primary sedimentation tank 4 is connected with a slag discharge port 10 of a heat extraction bin, the top of the primary sedimentation tank 4 is provided with an overflow port, the overflow port is connected with a secondary sedimentation tank 15, the top of the secondary sedimentation tank is provided with an overflow port connected with the next primary sedimentation tank, and the overflow port of the last primary sedimentation tank is connected with a working medium storage tank 13;
the working medium storage pool has the functions that: 1) the method comprises the steps of (1) storage of a supplementary working medium, 2) storage of a backflow working medium, 3) recovery and storage of a clarified working medium separated by a sedimentation tank, and 4) supply of a cold working medium to a heat extraction bin through a high-pressure pump and a pumping pipeline.
The upper part of the working medium storage tank 13 is provided with a high-pressure working medium inlet 9 which is connected with the heat extraction bin 3 through a working medium output pipeline 23 and a high-pressure pump 24, and the working medium storage tank 13 is also provided with a working medium supplement pipeline 25.
And a filtering device 26 is also arranged on the working medium output pipeline, so that a small amount of impurities in the working medium storage tank 13 are prevented from entering the high-pressure pump to cause blockage or damage, and the smooth production is influenced.
The heat utilization unit 11 is a steam turbine and a heating radiator. The hot inlet of the heat utilization unit 11 is connected with the steam outlet, and the cold outlet is connected with the working medium storage pool 13.
The upper part of the working medium storage tank 13 is provided with a high-pressure working medium inlet 20 which is connected with the heat extraction bin 3 through a working medium output pipeline 23 and a high-pressure pump 24, and the working medium storage tank 13 is also provided with a working medium supplement pipeline 25.
The slag baffle 17 is of a single-layer or multi-layer screen structure, and when a multi-layer structure is adopted, staggered hole structures are adopted among layers.
The top of the heat extraction bin 3 is also provided with a pressure sensor 31 and a pressure relief safety valve 32.
And a heat exchanger 28 is also arranged in the primary sedimentation tank, is connected with a working medium output pipeline and carries out preheating treatment on the working medium so as to further improve the utilization efficiency of sensible heat of the high-temperature slag.
And the outer walls of the slag feeding port and the slag inlet are also provided with cooling water jackets 29, and circulating cooling water is arranged in the cooling water jackets.
The process route of the high-temperature slag is as follows: the high-temperature reducing slag is transported and then stored in a high-temperature slag bin, is sent into a heat extraction bin through a slag feeder below the slag bin and falls below the liquid level in the bin, and exchanges heat with working media in the bin to enable the working media to be heated and gasified to form working medium steam. The slag after heat release is settled to the position of a slag outlet below the heat extraction bin under the action of gravity, so that the primary separation of the slag and the working medium is realized, and the slag enters a primary sedimentation tank below through a slag discharger to perform secondary separation of the slag and the working medium. The working medium subjected to primary precipitation separation enters a secondary sedimentation tank from an overflow port above the primary sedimentation tank to carry out tertiary separation … … of slag and the working medium until the working medium is clarified to a storage tank.
The process route of the working medium is as follows: and the clarifying working medium storage tank simultaneously collects the reflux working medium after steam is condensed, the precipitate recovery working medium and the working medium for supplementing system loss. Working media in the clarified working medium storage pool enter the heat extraction bin through a high-pressure pump, the working media consumed by gasification and slag discharge in the heat extraction bin are supplemented through a spraying system, and meanwhile, dust at a slag inlet is sprayed and reduced; the heated and gasified working medium steam enters a heat consumption unit through a steam outlet and a gas supply pipeline, and after heat release and condensation, the working medium steam flows back through a return pipeline and enters a clarified working medium storage pool.
According to actual conditions, a heat exchanger can be added in the primary sedimentation tank to preheat working media, so that the sensible heat utilization efficiency of the high-temperature slag is further improved.
Example 2
A high-temperature slag waste heat recycling system adopting a direct heat extraction method comprises a high-temperature slag bin 1, a heat extraction bin 3, a sedimentation tank 4 and a working medium storage tank 5, wherein a slag feeding port 2 is formed in the bottom of the high-temperature slag bin 1, a slag feeder 6 is arranged on the slag feeding port 2, the slag feeding port is connected with the heat extraction bin 3, a slag inlet 7 and a steam outlet 8 are formed in the top of the heat extraction bin, a high-pressure working medium inlet 9 is formed in the upper part of the heat extraction bin, a slag discharging port 10 is formed in the bottom of the heat extraction bin, the steam outlet 8 is connected with a heat consumption unit 11, a cold working medium outlet 12 of the heat consumption unit 11 is connected with the working medium storage tank 13, the slag discharging port 10 is provided with a slag discharging device 14, the slag discharging port 10 is connected with the; the working medium in the system of the embodiment is water.
The high-temperature slag bin 1 is built by refractory materials; the failure caused by the high temperature of the slag in the bin is avoided, and the loss of sensible heat carried by the high-temperature slag in the bin can be prevented. The method has the advantages that the high-temperature slag transported from the slag source is stored, and the working sustainability of the whole system is guaranteed.
The heat extraction bin 3 comprises working areas and components such as a top slag inlet 7, a steam area 16 positioned at the upper part, a steam outlet 8, a slag baffle 17, a heat extraction area 18 positioned at the lower part and the like, and is a place where working media and high-temperature slag perform heat extraction reaction and generate steam. The slag inlet 7 is provided with a slag inlet pipe 19, the upper part of the heat extraction bin 3 is provided with a steam outlet 8, a slag baffle 17 is arranged in a steam area at the upper part of the heat extraction bin, the slag baffle 17 is positioned between an outlet of the slag inlet pipe 19 and the steam outlet, the upper part of the heat extraction bin is provided with one or more high-pressure working medium inlets 20, the high-pressure working medium inlets 20 are arranged at the upper part of an outlet of the slag inlet pipe 19, the high-pressure working medium inlets 20 are provided with high-pressure nozzles, and a slag discharge port 10 at the bottom of the heat extraction bin 3 is provided with a slag discharger 14;
the sedimentation tank is a primary sedimentation tank, the primary sedimentation tank is connected with a slag discharge port 10 of the heat extraction bin, a cold slag outlet 22 is arranged at the bottom of the primary sedimentation tank, an overflow port is arranged at the top of the primary sedimentation tank, and the overflow port is connected with a working medium storage tank 13;
the upper part of the working medium storage tank 13 is provided with a high-pressure working medium inlet 20 which is connected with the heat extraction bin 3 through a working medium output pipeline 23 and a high-pressure pump 24, and the working medium storage tank 13 is also provided with a working medium supplement pipeline 25.
And a filtering device 26 is also arranged on the working medium output pipeline.
The heat utilization unit 11 is a steam turbine and a heating radiator.
The slag baffle 17 is of a single-layer or multi-layer screen structure, and when a multi-layer structure is adopted, staggered hole structures are adopted among layers.
The top of the heat extraction bin 3 is also provided with a pressure sensor 31 and a pressure relief safety valve 32.
And a heat exchanger 28 is also arranged in the primary sedimentation tank, is connected with a working medium output pipeline and carries out preheating treatment on the working medium so as to further improve the utilization efficiency of sensible heat of the high-temperature slag.
And the outer walls of the slag feeding port and the slag inlet are also provided with cooling water jackets 29, and circulating cooling water is arranged in the cooling water jackets.
The foregoing shows and describes the general principles of the present invention, its essential features, and advantages, and thus, the present invention has been described in considerable detail with particularity and detail without limitation to the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (8)
1. A direct heat extraction method high-temperature slag waste heat recycling system is characterized by comprising a high-temperature slag bin, a heat extraction bin, a sedimentation tank and a working medium storage tank,
the bottom of the high-temperature slag bin is provided with a slag feeding port, the slag feeding port is connected with a slag inlet of the heat extraction bin, the upper part of the heat extraction bin is provided with a high-pressure working medium inlet, the high-pressure working medium inlet is connected with a working medium storage pool, the bottom of the heat extraction bin is provided with a slag discharging port, the slag discharging port is connected with a sedimentation tank, and the sedimentation tank is connected with the working medium storage pool;
the high-temperature slag bin is built by refractory materials, a slag feeder is arranged in the bottom slag feeding port, a cooling water jacket is also arranged on the outer wall of the slag feeding port, and circulating cooling water is arranged in the cooling water jacket;
the heat extraction bin comprises a top slag inlet, a steam area positioned at the upper part, a steam outlet, a slag baffle and a heat extraction area positioned at the lower part, wherein the top of the heat extraction bin is provided with the slag inlet, the slag inlet is provided with a slag inlet pipe, the upper part of the heat extraction bin is provided with the steam outlet, the steam area at the upper part of the heat extraction bin is internally provided with the slag baffle, the slag baffle is positioned between the outlet of the slag inlet pipe and the steam outlet, the upper part of the heat extraction bin is provided with one or more high-pressure working medium inlets, the high-pressure working medium inlets are arranged at the upper part of the outlet of the slag inlet pipe, and the slag outlet at the bottom of the heat;
the sedimentation tank is a one-stage or multi-stage sedimentation tank, a cold slag outlet is arranged at the bottom of the sedimentation tank, an overflow port is arranged at the top of the sedimentation tank, and the overflow port is connected with a working medium storage tank;
the upper part of the working medium storage pool is provided with a high-pressure working medium inlet which is connected with the heat extraction bin through a working medium output pipeline and a high-pressure pump, and the working medium storage pool is also provided with a working medium supplement pipeline;
the hot inlet of the heat utilization unit is connected with the steam outlet, and the cold outlet is connected with the working medium storage pool.
2. The system for recycling high-temperature slag waste heat by using the direct heat extraction method according to claim 1, wherein a filtering device is further arranged on the working medium output pipeline.
3. The system for recycling high-temperature slag waste heat by using the direct heat extraction method according to claim 1, wherein the high-pressure working medium inlet is provided with a high-pressure spray head.
4. The system for recycling high-temperature slag waste heat by using the direct heat extraction method according to claim 1, wherein the slag baffle has a single-layer or multi-layer screen structure.
5. The system for recycling the high-temperature slag waste heat by the direct heat extraction method according to claim 1, wherein a pressure sensor and a pressure relief safety valve are further arranged at the top of the heat extraction bin.
6. The system according to claim 1, wherein when the sedimentation tank is a multi-stage sedimentation tank connected in series, a first-stage sedimentation tank is connected with the slag discharge port of the heat extraction bin, an overflow port is arranged at the top of the first-stage sedimentation tank, the overflow port is connected with a second-stage sedimentation tank, an overflow port is arranged at the top of the second-stage sedimentation tank and connected with a next-stage sedimentation tank, and an overflow port of the last-stage sedimentation tank is connected with the working medium storage tank.
7. The system for recycling the high-temperature slag waste heat by the direct heat extraction method according to claim 1, wherein a heat exchanger is further arranged in the sedimentation tank, the heat exchanger is connected with a working medium output pipeline, and the working medium is preheated.
8. The system for recycling high-temperature slag waste heat by using the direct heat extraction method according to claim 1, wherein the heat utilization units are steam turbines and heating radiators.
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