CN115094168B - Slag recovery system - Google Patents
Slag recovery system Download PDFInfo
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- CN115094168B CN115094168B CN202210625410.XA CN202210625410A CN115094168B CN 115094168 B CN115094168 B CN 115094168B CN 202210625410 A CN202210625410 A CN 202210625410A CN 115094168 B CN115094168 B CN 115094168B
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- recovery
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- 238000011084 recovery Methods 0.000 title claims abstract description 133
- 239000002893 slag Substances 0.000 title claims abstract description 121
- 238000001816 cooling Methods 0.000 claims abstract description 129
- 239000007789 gas Substances 0.000 claims abstract description 86
- 239000000112 cooling gas Substances 0.000 claims abstract description 49
- 239000002918 waste heat Substances 0.000 claims abstract description 26
- 238000005469 granulation Methods 0.000 claims abstract description 7
- 230000003179 granulation Effects 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 238000009826 distribution Methods 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 30
- 230000008569 process Effects 0.000 abstract description 26
- 239000011797 cavity material Substances 0.000 abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 13
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- UICBCXONCUFSOI-UHFFFAOYSA-N n'-phenylacetohydrazide Chemical compound CC(=O)NNC1=CC=CC=C1 UICBCXONCUFSOI-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- 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
Abstract
The application discloses recovery system of slag, including centrifugal granulation device, screw conveyor, first cooling gas circuit, second cooling gas circuit and waste heat recovery device. The rotary tray of the centrifugal granulating device completes dry centrifugal granulating in the working cavity. The feeding cavity material of the spiral conveying device is connected with the working cavity, and the spiral conveying rod of the spiral conveying device breaks and conveys the granulated slag. The first cooling air circuit comprises a first cooling branch circuit and a first recovery branch circuit which are connected to the working cavity through an air circuit. The second cooling air circuit comprises a second cooling branch circuit and a second recovery branch circuit which are connected to the feeding cavity through the air circuit. The waste heat recovery device is provided with a gas path channel, a first recovery branch and a second recovery branch are connected with the inlet end of the gas path channel, a first cooling branch and a second cooling branch are connected with the outlet end of the gas path channel, and the waste heat recovery device is also provided with a heat exchange pipeline for heat exchange with the gas path channel. The whole cooling process can be continuously circulated, and unnecessary energy and resource consumption is avoided.
Description
Technical Field
The present application relates to a recovery system, and in particular to a slag recovery system.
Background
In the fields of metallurgy, chemical industry and the like, complex and high-cost recovery steps are often involved after the generation of high-temperature slag.
Taking yellow phosphorus production as an example, the main process of the existing yellow phosphorus production is an electric furnace method, phosphate ore, silica and pyrodine are fed into an electric furnace together, and phosphorus pentoxide in the phosphate ore is reduced into elemental phosphorus by carbon under the high-temperature condition. In the process of producing yellow phosphorus by the electric furnace method, a large amount of high-temperature slag is produced, and according to statistics, about 10 tons of slag are produced per 1 ton of yellow phosphorus produced, and the temperature of slag discharged by the electric furnace is often above 1400 ℃, so that the electric furnace has higher physical sensible heat.
At present, a water quenching method is generally adopted in the treatment mode of high-temperature slag, namely, the high-temperature slag is discharged through a slag outlet of an electric furnace and flows into a special water tank for water quenching and cooling, and a water quenched product is used for producing cement.
The water quenching method consumes a large amount of water resources in the process of treating the high-temperature slag, has certain requirements on the consumption of slag flushing water in order to ensure that the slag is fully contacted with water, and has evaporation and dissipation of a large amount of water in the process of contacting the water with the high-temperature slag. According to measurement and calculation, 1.2 tons of fresh water and 10 tons of circulating water are consumed for treating 1 ton of slag. In the water quenching process, the emission of SO2, H2S and other acid gas pollutants is accompanied, the emission of sulfide of each ton of slag is more than 5000mg, and the sulfide is mainly diffused in the air along with water vapor, SO that serious secondary pollution is brought. In addition, the high-quality sensible heat contained in the high-temperature slag cannot be effectively recycled, and the energy waste is huge. After the water quenching process is adopted for treatment, the high-value sensible heat (about 1450 ℃) of the slag is converted into low-temperature waste heat (about 90 ℃) of slag flushing water, and the low-temperature slag flushing water contains corrosive phosphorus, sulfur and other substances, so that waste heat recovery and utilization are difficult, and a great amount of high-quality heat energy is lost and wasted each year.
Disclosure of Invention
In view of the above, the present application discloses a slag recovery system that overcomes or at least partially solves the above-described problems.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the application provides a recovery system of slag, it includes centrifugal granulation device, screw conveyor, first cooling gas circuit, second cooling gas circuit and waste heat recovery device. The centrifugal granulating device is provided with a working cavity, and also provided with a rotating tray arranged in the working cavity, and the rotating tray can finish dry centrifugal granulating of slag. The spiral conveying device is provided with a feeding cavity, the feeding cavity is connected with the working cavity to receive granulated slag, the feeding cavity is provided with a recycling discharge hole, the spiral conveying device is further provided with a spiral conveying rod positioned in the feeding cavity, the spiral conveying rod can crush the granulated slag and convey the slag to the recycling discharge hole. The first cooling air circuit comprises a first cooling branch circuit and a first recovery branch circuit which are connected to the working cavity through an air circuit. The second cooling air circuit comprises a second cooling branch circuit and a second recovery branch circuit which are connected to the feeding cavity through the air circuit. The waste heat recovery device is provided with a gas path channel, a first recovery branch gas path and a second recovery branch gas path are connected to the inlet end of the gas path channel, a first cooling branch gas path and a second cooling branch gas path are connected to the outlet end of the gas path channel, and the waste heat recovery device is also provided with a heat exchange pipeline capable of exchanging heat with the gas path channel.
According to the slag recovery system, the slag heat is recovered through the establishment of the cooling gas circuit, and the inert gas can be used as the cooling medium, so that additional undesirable harmful products are not generated, the heat in the slag can be carried out in a heat exchange mode for the use of a subsequent waste heat recovery device, the cooling medium can be repeatedly used in a cooling process, the whole process can be continuously circulated, and unnecessary energy and resource consumption are avoided. And the establishment of two paths of cooling air paths accelerates the cooling efficiency, and the two cooling processes have the possibility of mutual coordination.
In one embodiment of the slag recovery system, the waste heat recovery device is a waste heat boiler and the heat exchange line is a steam generation line. The slag recovery system also comprises a steam turbine which can be connected with a steam generating pipeline and a generator which can be driven by the steam turbine, and the energy conversion mode of the slag recovery system is clean and efficient.
In one embodiment of the slag recovery system, the slag recovery system further comprises a cooling aggregate path and a cooling gas path distribution device. The cooling main air passage is connected with the outlet end of the air passage of the waste heat recovery device. The cooling air path distribution device can be connected to the cooling main path through an air path, the first cooling branch path and the second cooling branch path are connected to the cooling air path distribution device through an air path, and the cooling air path distribution device can control the air flow entering the first cooling branch path and/or the second cooling branch path from the cooling main path. The structure can adapt to different special working conditions.
In one embodiment of the slag recovery system, the slag recovery system further comprises a cooling gas mixer arranged in the cooling main path and a cooling gas source capable of being connected with the cooling gas mixer in a gas path, wherein the cooling gas mixer can control the conduction with the cooling gas source according to the gas flow rate and the gas temperature of the cooling main path. The supplement of the cooling air source can ensure the air flow and the air temperature of the cooling total path.
In one embodiment of the slag recovery system, the cooling gas source includes a gas tank connected to the cooling gas mixer via a gas line, and a nitrogen generator connected to the gas tank via a gas line.
In one embodiment of the slag recovery system, the slag recovery system further comprises a circulation fan disposed in the cooling aggregate path and located between the cooling gas mixer and the cooling gas path distribution device. The structure can enable the cooling air path distribution device to control the flow more accurately.
In one embodiment of the slag recovery system, the slag recovery system further comprises a recovery train and a recovery gas mixer. The recovery main gas circuit is connected to the inlet end of the gas circuit channel of the waste heat recovery device. The gas recovery mixer can be connected to the recovery main path through the gas path, the first recovery branch path and the second recovery branch path are connected to the gas recovery mixer, and the gas recovery mixer can control the temperature of the gas entering the recovery main path based on the first recovery branch path and/or the second recovery branch path. The structure can ensure the stability and the efficiency of heat recovery.
In one embodiment of the slag recovery system, the slag recovery system further comprises a buffer storage tank for slag, the material of which is connected to the working chamber of the centrifugal granulation device. The buffer storage tank can ensure that high-temperature slag is provided for the working cavity of the centrifugal granulating device in quantity.
In one embodiment of the slag recovery system, the second cooling branch is connected to the feeding cavity at a position on one side of the recovery discharging hole, and the second recovery branch is connected to the feeding cavity at a position on one side of the feeding cavity connected with the working cavity. The structure can lead the flow direction of the cooling air flow entering from the second cooling branch to be opposite to the conveying direction of the high-temperature slag in the feeding cavity, and the structural design is more beneficial to the cooling efficiency of the high-temperature slag in the feeding cavity.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram illustrating an exemplary embodiment of a slag recovery system.
Fig. 2 is a schematic diagram illustrating another exemplary embodiment of a slag recovery system.
Description of the reference numerals:
12. centrifugal granulating device
122. Working chamber
124. Rotary tray
14. Screw conveyor
141. Recovery discharge port
142. Feeding cavity
144. Screw conveying rod
20. First cooling air path
22. First cooling branch
24. A first recovery branch
30. Second cooling air path
32. Second cooling branch
34. A second recovery branch
40. Waste heat recovery device
42. Outlet end of air channel
44. Inlet end of air channel
45. Heat exchange pipeline
52. Steam turbine
54. Electric generator
61. Circulation fan
62. Cooling main path
64. Cooling air path distribution device
66. Cooling gas mixer
67. Cooling air source
68. Air storage tank
69. Nitrogen making machine
72. Recovery main road
74. Recycle gas mixer
80. Buffer storage tank
Description of the embodiments
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In this document, "schematic" means "serving as an example, instance, or illustration," and any illustrations, embodiments described herein as "schematic" should not be construed as a more preferred or advantageous solution.
For simplicity of the drawing, only the parts relevant to the present application are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. In addition, for simplicity and ease of understanding, components having the same structure or function in some of the figures are shown schematically only one of them, or only one of them is labeled.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic diagram illustrating an exemplary embodiment of a slag recovery system. It should be noted that, for clarity of presentation of the material transfer relationships and the gas flow transfer relationships between the various components, the material flow direction is shown by dashed arrows and the gas flow direction is shown by solid arrows in the figures.
As shown in fig. 1, the slag recovery system includes a centrifugal granulating apparatus 12, a screw conveyor 14, a first cooling air path 20, a second cooling air path 30, and a waste heat recovery apparatus 40.
The centrifugal granulating apparatus 12 is formed with a working chamber 122, and further has a rotating tray 124 disposed in the working chamber 122, and the high-speed rotation of the rotating tray 124 centrifugally granulates the high-temperature slag entering the working chamber 122 in the direction of the dotted arrow, and during this process, the high-temperature slag is granulated into fine solid slag particles with a diameter of about 2mm to 5 mm. In the process, the granulated slag has more heat dissipation area and releases larger heat.
The slag centrifugally granulated by the centrifugal granulating apparatus 12 is transferred to the screw conveyor 14 via the working chamber 122, the screw conveyor 14 is formed with a feed chamber 142, the feed chamber 142 can be connected with the working chamber 122 of the centrifugal granulating apparatus 12 by material, i.e. the slag centrifugally granulated in the working chamber 122 is transferred as material to the feed chamber 142 of the screw conveyor 14, the feed chamber 142 is further provided with a recovery discharge port 141 for finally recovering slag, and the slag discharged through the recovery discharge port 141 is finally fed as a finished product to a warehouse. The screw conveyor 14 is provided with a screw conveyor 144, the screw conveyor 144 can convey granulated slag entering the feed chamber 142 from the working chamber 122 to the recovery discharge port 141, and the screw conveyor 144 can further crush slag during slag conveying.
The first cooling air path 20 is mainly a cooling air path for the centrifugal granulating device 12, the first cooling air path 20 includes a first cooling branch 22 and a first recovery branch 24 which can be connected to the working chamber 122 of the centrifugal granulating device 12, the cooling air flow can enter the working chamber 122 through the first cooling branch 22, cool slag in the working chamber 122, and then take away heat in the working chamber 122 through the first recovery branch 24.
The second cooling air path 30 is mainly a cooling air path for the screw conveyor 14, the second cooling air path 30 includes a second cooling branch 32 and a second recovery branch 34 connected to the feeding cavity 142 of the screw conveyor 14, the cooling air flow can enter the feeding cavity 142 through the second cooling branch 32, cool slag in the feeding cavity 142, and then take away heat in the feeding cavity 142 through the second recovery branch 34.
The waste heat recovery device 40 forms a gas path channel (not specifically shown in the drawings), the first recovery branch 24 and the second recovery branch 34 can be connected to an inlet end 44 of the gas path channel, the first cooling branch 22 and the second cooling branch 32 can be connected to an outlet end 42 of the gas path channel, and the waste heat recovery device is further formed with a heat exchange pipeline capable of exchanging heat with the gas path channel. The waste heat recovery device 40 mainly plays a role in heat recovery or heat conversion, and can recover the heat in the working cavity 122 of the centrifugal granulating device 12 recovered by the first recovery branch 24 and the heat in the feeding cavity 142 of the screw conveying device 14 recovered by the second recovery branch 34, and the recovered heat is subjected to heat exchange with the heat exchange pipeline 45 through the air passage in a heat exchange mode, so that the heat exchange pipeline 45 can continuously utilize the recovered heat, and after the heat of the air flow in the air passage is lost, the air flow can be continuously utilized as cooling air flow, and the cooling air flow is re-supplied to the first cooling branch 22 and the second cooling branch 32 from the outlet end 42 of the air passage.
The gas for realizing cooling in the slag recovery system can generally adopt nitrogen, the nitrogen is used as inert gas, the nitrogen is not easily affected by high temperature, harmful substances are not generated due to reaction, and the nitrogen can be easily obtained from air in a large amount, so that the cost is saved. It will be appreciated by those skilled in the art that the gas used to effect cooling in the slag recovery system may be other gases, such as other inert gases, depending on the design requirements.
According to the slag recovery system, the slag heat is recovered through the establishment of the cooling gas circuit, and inert gas can be used as a cooling medium, so that the cooling medium can not generate additional undesirable harmful products in the cooling process, and can directly conduct out heat energy sources to be used as subsequent energy sources in a heat exchange mode, the cooling medium can be repeatedly used in the cooling process, the whole process can be continuously circulated, and almost no unnecessary energy sources and resources are consumed.
The other two cooling processes are complementary to the cooling efficiency, taking yellow phosphorus slag as an example, when the yellow phosphorus slag enters the working cavity 122 of the centrifugal granulating device 12, the temperature of the yellow phosphorus slag can reach more than 1400 ℃, after the yellow phosphorus slag is centrifugally granulated by the rotating tray 124 in the working cavity, the yellow phosphorus slag can be granulated into fine solid slag particles with the particle size of about 2mm-5mm, in the process, the contact area of the yellow phosphorus slag and cooling gas can be rapidly increased, a large amount of temperature of the yellow phosphorus slag can be rapidly taken away, for example, when nitrogen gas enters the working cavity 122 through the first cooling gas path, the temperature of the nitrogen gas is about 120 ℃, the temperature of the yellow phosphorus slag cooled by the nitrogen gas can be reduced to about 750 ℃, and the temperature of the nitrogen gas recovered through the first recovery branch is about 550 ℃.
In the feeding chamber 142 of the screw conveyor 14, the yellow phosphorus slag is turned over by the screw conveyor, and by this process, the granulated slag is brought into sufficient contact with the cooling gas to further take away heat, and in this process, the temperature of the nitrogen gas introduced into the feeding chamber 142 through the second cooling gas passage is about 120 ℃, the granulated slag is reduced from the temperature of 750 ℃ to about 150 ℃, and is recovered through the recovery discharge port 141, and is stored as a finished product, and is subsequently used for producing building materials such as cement, and the temperature of the nitrogen gas recovered from the second recovery branch is about 500 ℃.
Through the above process, the slag recovery system utilizes two physical processes of high temperature slag recovery: and the centrifugal granulating process and the spiral conveying process are completed, and meanwhile, the heat cooling and recovering processes of the high-temperature slag are completed. And the cooling efficiency is accelerated by utilizing the morphological change of the high-temperature slag in the two physical processes.
In particular, the two cooling air paths are established, so that the two cooling processes are also possible to be mutually coordinated, for example, when the temperature of the high-temperature slag entering the working cavity or the feeding cavity in different time periods changes in a gradient manner, the flow of the cooling air conveyed by the first cooling air path or the flow of the cooling air conveyed by the second cooling air path can be adjusted to make corresponding adjustment, thereby being beneficial to the cooling of the high-temperature slag, facilitating the follow-up heat recovery action and ensuring the stability and efficiency of heat recovery.
Fig. 2 is a schematic diagram illustrating another exemplary embodiment of a slag recovery system. The heat recovery device 40 shown in fig. 2 is a heat recovery boiler, and the heat exchange line 45 is a steam generation line. The slag recovery system further includes a steam turbine 52 that can be coupled to the steam generating line and a generator 54 that can be driven by the steam turbine 52. This way, the recovered heat energy is converted into steam as the kinetic energy of the steam turbine 52, and finally drives the generator 54 to generate electricity to be converted into electric energy, which is an energy conversion way of recovering heat energy, and the energy conversion way is clean and efficient. Those skilled in the art will appreciate that other thermal energy utilization or conversion of thermal energy to other energy sources are possible and are not limited to the manner shown in fig. 2.
In the embodiment shown in fig. 2, the slag recovery system further includes a cooling manifold 62 and a cooling gas circuit distribution device 64. The cooling manifold 62 is air-coupled to the outlet end 42 of the air passage of the waste heat recovery device 40. The cooling circuit distribution device 64 can be connected to the cooling circuit 62 in a circuit manner, the first cooling branch circuit 22 and the second cooling branch circuit 32 are connected to the cooling circuit distribution device 64 in a circuit manner, and the cooling circuit distribution device 64 can control the flow of the gas entering the first cooling branch circuit 22 and/or the second cooling branch circuit 32 from the cooling circuit 62. The cooling gas circuit distribution device 64 adjusts the gas flow of the first cooling branch 22 and/or the second cooling branch 32, so that different special working conditions can be adapted.
For example, during the operation of the overall recovery system, the working chamber 122 and/or the feeding chamber may have a temperature gradient, so that the final cooling effect and cooling efficiency may be ensured by the adjustment of the cooling air path distribution device 64. For example, when the temperature of the working chamber 122 is too high, the gas flow rate of the cooling gas in the first cooling branch 22 may be increased, which is generally achieved by increasing the gas flow rate in the first cooling branch 22, but in a certain case, even if the gas flow rate is increased continuously, no more heat can be taken away, so that the gas flow rate of the first cooling branch 22 does not need to be increased continuously, and the cooling effect is ensured by adjusting the gas flow rate of the cooling gas in the second cooling branch 32.
In the embodiment of the slag recovery system shown in fig. 2, the slag recovery system further comprises a cooling gas mixer 66 disposed in the cooling total path 62, and a cooling gas source 67 capable of being connected to the cooling gas mixer 66 in a gas path, wherein the cooling gas mixer 66 can control the conduction with the cooling gas source 67 according to the gas flow rate and the gas temperature of the cooling total path 62 so as to ensure the gas flow rate and the gas temperature of the cooling total path 62 through the supplement of the cooling gas source 67. In the embodiment shown in the figures, the cooling gas source 67 comprises a gas tank 68 connected to the cooling gas mixer 66 in a gas path, and a nitrogen generator 69 connected to the gas tank 68 in a gas path. Nitrogen is an inert gas which is relatively easy to obtain, and the use cost of the nitrogen as cooling gas is low and very convenient. The gas tank 68 serves as an intermediate storage unit to assist in storing nitrogen gas and to timely replenish the cooling main 62 with nitrogen gas.
In the embodiment of the slag recovery system shown in fig. 2, the slag recovery system further includes a circulating fan 61, where the circulating fan 61 is disposed in the cooling total path 62 and between the cooling gas mixer 66 and the cooling gas path distribution device 64, and the circulating fan 61 can be used as a power source of the entire cooling gas circulating path, and is disposed between the cooling gas mixer 66 and the cooling gas path distribution device 64, so that the control flow rate of the cooling gas path distribution device 64 can be more accurate.
In the embodiment of the slag recovery system shown in fig. 2, the slag recovery system further includes a recovery manifold 72 and a recovery gas mixer 74. The recovery manifold 72 is air-coupled to the inlet end 44 of the air path channel of the waste heat recovery device 40. The recycling gas mixer 74 can be connected to the recycling gas mixer 72 in a gas way, the first recycling branch 24 and the second recycling branch 34 are connected to the recycling gas mixer 74 in a gas way, the recycling gas mixer 74 can control the temperature of gas entering the recycling gas mixer 72 based on the first recycling branch 24 and/or the second recycling branch 34, namely, the temperature of gas flowing into the recycling gas mixer 72 is controlled by controlling the flow rate of gas entering the recycling gas mixer 74 through the first recycling branch 24 and the second recycling branch 34 (the gas in the first recycling branch 24 and the second recycling branch 34 has own temperature), so as to finally control the temperature of gas entering the inlet end 44 of the gas channel in the waste heat recycling device, and ensure the stability and the efficiency of heat recycling.
In the embodiment of the slag recovery system shown in fig. 2, the slag recovery system further comprises a buffer tank 80 for slag, wherein the buffer tank 80 is connected to the working chamber 122 of the centrifugal granulation device 12, i.e. the high-temperature slag in the buffer tank 80 can be transferred as a material to the working chamber 122 of the centrifugal granulation device 12. The buffer storage tank 80 stores therein high temperature slag to ensure that the high temperature slag is provided in an amount to the working chamber 122 of the centrifugal granulation device 12.
In the embodiment of the slag recovery system shown in fig. 1 and 2, the position of the second cooling branch 32 connected to the feeding cavity 142 of the screw conveyor 14 is located at the side of the recovery discharge port 141, the position of the second recovery branch 34 connected to the feeding cavity 142 is located at the side of the feeding cavity 142 connected to the working cavity 122 of the centrifugal granulating apparatus 12, i.e. the position of the second recovery branch 34 connected to the feeding cavity 142 is located at the side of the feeding cavity 142 from which the high-temperature slag is obtained from the working cavity 122. It can be seen that with the above-described configuration, the flow direction of the cooling air stream entering from the second cooling branch 32 in the feed cavity 142 is opposite to the conveying direction of the high-temperature slag in the feed cavity 142, and the structural design further contributes to the cooling efficiency of the high-temperature slag in the feed cavity 142.
The foregoing is merely a specific implementation of the present application and other modifications and variations can be made by those skilled in the art based on the above-described examples in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the present application and that the scope of the present application is to be controlled by the scope of the appended claims.
Claims (6)
1. A slag recovery system, comprising:
the centrifugal granulating device is provided with a working cavity and a rotating tray arranged in the working cavity, and the rotating tray can finish dry centrifugal granulating of slag;
the spiral conveying device is provided with a feeding cavity, the feeding cavity is connected with the working cavity to receive the granulated slag, the feeding cavity is provided with a recycling discharge hole, the spiral conveying device is also provided with a spiral conveying rod positioned in the feeding cavity, and the spiral conveying rod can crush the granulated slag and convey the slag to the recycling discharge hole;
the first cooling air circuit comprises a first cooling branch and a first recovery branch which are connected to the working cavity through air circuits;
the second cooling air circuit comprises a second cooling branch and a second recovery branch which are connected to the feeding cavity through air circuits;
the waste heat recovery device is provided with a gas path channel and a heat exchange pipeline capable of exchanging heat with the gas path channel;
the air channel of the cooling main channel is connected with the outlet end of the air channel of the waste heat recovery device;
the cooling air channel distribution device can be connected to the cooling main channel in an air channel manner, the first cooling branch channel and the second cooling branch channel are connected to the cooling air channel distribution device in an air channel manner, and the cooling air channel distribution device can control the air flow entering the first cooling branch channel and/or the second cooling branch channel from the cooling main channel;
the gas circuit of the recovery main circuit is connected to the inlet end of the gas circuit channel of the waste heat recovery device;
the recycling gas mixer can be connected to the recycling main path through a gas path, the first recycling branch path and the second recycling branch path are connected to the recycling gas mixer through a gas path, and the recycling gas mixer can control the temperature of gas entering the recycling main path based on the first recycling branch path and/or the second recycling branch path;
the slag recovery system further comprises a cooling gas mixer arranged on the cooling total path and a cooling gas source capable of being connected with the cooling gas mixer in a gas path mode, and the cooling gas mixer can control conduction with the cooling gas source according to the gas flow and the gas temperature of the cooling total path.
2. The slag recovery system of claim 1, wherein,
the waste heat recovery device is a waste heat boiler, and the heat exchange pipeline is a steam generation pipeline;
the slag recovery system further comprises a steam turbine capable of being connected to the steam generating pipeline and a generator capable of being driven by the steam turbine.
3. The slag recovery system of claim 1, wherein the cooling gas source includes a gas tank gas-line connected to a cooling gas mixer and a nitrogen generator gas-line connected to the gas tank.
4. The slag recovery system of claim 1, further comprising a circulation fan disposed in the cooling manifold and positioned between the cooling gas mixer and the cooling gas circuit distribution device.
5. The slag recovery system of claim 1, further comprising a slag buffer storage tank in fluid communication with the working chamber of the centrifugal granulation device.
6. The slag recovery system of claim 1, wherein the location of the second cooling branch to the feed cavity is on a side of the recovery outlet and the location of the second recovery branch to the feed cavity is on a side of the feed cavity that is in material connection with the working cavity.
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