CN219174525U - Device for granulating blast furnace slag by using gas nozzle array - Google Patents
Device for granulating blast furnace slag by using gas nozzle array Download PDFInfo
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- CN219174525U CN219174525U CN202223367914.0U CN202223367914U CN219174525U CN 219174525 U CN219174525 U CN 219174525U CN 202223367914 U CN202223367914 U CN 202223367914U CN 219174525 U CN219174525 U CN 219174525U
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
An apparatus for granulating blast furnace slag using an array of gas nozzles, comprising: the slag granulating body is of a box structure, and a slag inflow port and a steam outflow channel are arranged at the top of the slag granulating body; a high-speed air injection mechanism comprising: the device comprises a compressor, an air storage tank, an air pipeline connected with the air storage tank and a nozzle array connected with one end of the air pipeline; a control valve and a flowmeter are sequentially arranged in a gas pipeline at the outlet end of the gas storage tank; the air storage tank is provided with a pressure gauge, an air inlet pipeline and an air inlet valve; the nozzle array comprises a plurality of atomizing nozzles and corresponding branch pipelines, and each branch pipeline is connected to the gas transmission pipeline respectively; the atomizing nozzle is arranged on one side wall of the slag granulating body. The utility model utilizes the high-speed air flow sprayed by the high-speed air nozzle to impact the liquid slag to crush the liquid slag, and rapidly reduces the temperature of the granulated slag particles, thereby being convenient for rapid slag formation and having the advantages of water quenching and air quenching granulating technology.
Description
Technical Field
The utility model relates to the field of blast furnace slag granulation, in particular to a device for granulating blast furnace slag by utilizing a gas nozzle array.
Background
The blast furnace slag is a slag in a molten state discharged from a blast furnace during pig iron smelting, and mainly contains CaO and SiO 2 、Al 2 O 3 MgO, which has a large yield, is a byproduct with the largest quantity in the metallurgical industry. The tapping temperature is as high as 1450-1650 ℃, the tapping temperature is also a high-quality heat source, the enthalpy is about 1770MJ/t, in the high-grade waste heat resource, the sensible heat of slag accounts for about 35%, and the potential, economical efficiency and feasibility of waste heat recovery exist, so that under the current situation, the research on the waste heat recovery and utilization of blast furnace slag becomes the focus of attention of enterprises in recent years.
At present, the blast furnace slag waste heat recovery process is generally divided into a wet process and a dry recovery process. The wet process mostly adopts a water quenching process. The water quench process is severely water-resource consuming, requiring about 10 tons of water per ton of slag to be treated, accompanied by large amounts of sulfur-containing vapors such as SO X And H 2 S is discharged, the pipeline is easy to wear and the maintenance workload is large, the sensible heat of slag is not recovered, only 10% of heat can be used for heating and generating electricity after water quenching, and the rest 90% of heat enters the atmosphere in the form of water vapor and is wasted. In order to further utilize the blast furnace slag after water quenching, a part of energy is still required to be consumed for drying the blast furnace slag. For the air quenching method in the dry recovery method, the method also has a series of defects such as serious noise pollution in the treatment process, huge power energy consumption, high cost, low temperature of the recovered hot air, low benefit, and cooling rate and water coolingThe processing speed is slower than before, resulting in a reduced glass content.
Disclosure of Invention
The utility model aims to provide a device for granulating blast furnace slag by utilizing a gas nozzle array, which utilizes high-speed air flow sprayed by a high-speed gas nozzle to impact liquid slag to crush the slag, quickly reduces the temperature of the granulated slag particles, is convenient for quick slag formation, can properly reduce water consumption to reduce cost, can also consider the cooling rate of the slag to be beneficial to the formation of glass bodies of solid slag, can fully utilize the waste heat of the slag to reduce energy loss, and has the advantages of water quenching and wind quenching granulating technology; the cooling rate is faster, the slag crushing effect is good, and the energy consumption is low.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
an apparatus for granulating blast furnace slag using an array of gas nozzles, comprising:
the slag granulating body is of a box structure, and a slag inflow port and a steam outflow channel are arranged at the top of the slag granulating body;
a high-speed air injection mechanism comprising:
the device comprises a compressor, an air storage tank, an air pipeline connected with the air storage tank and a nozzle array connected with one end of the air pipeline; a control valve and a flowmeter are sequentially arranged in a gas pipeline at the outlet end of the gas storage tank;
the air storage tank is provided with a pressure gauge, an air inlet pipeline and an air inlet valve;
the nozzle array comprises a plurality of atomizing nozzles and corresponding branch pipelines, and each branch pipeline is connected to the gas transmission pipeline respectively; the atomizing nozzle is arranged on one side wall of the slag granulating body.
Further, the method further comprises the following steps: the nozzle atomizing mechanism comprises a second control valve, a water pump, a third control valve, a pressure gauge, a flowmeter and a plurality of atomizing nozzles which are sequentially arranged along the water conveying pipeline; the inlet end of the water pipe is connected with a water source; the atomizing nozzles are arranged in at least two rows at the bottom of the slag granulating body, and the outlet direction of the atomizing nozzles is opposite to blast furnace slag flowing in from the slag inflow port.
Still further, still include waste heat recovery system, it includes:
the upper part of one side wall of the heat exchange box body is provided with a feed inlet communicated with the discharge port of the slag granulating body; a secondary heat exchange airflow outlet at the top of the heat exchange box body; a plurality of layers of perforated bed plates are arranged in the height direction in the heat exchange box body; the bottom of the heat exchange box body is provided with a slag particle outlet;
the gas nozzle array is arranged at the inner bottom of the heat exchange box body and below the perforated bed plate, and the gas nozzle outlet corresponds to the perforated bed plate upwards; or alternatively, the process may be performed,
the waste heat recovery system adopts a cyclone separator.
Preferably, the perforated bed plate is arranged in a zigzag manner in the height direction in the heat exchange box body.
Preferably, the cyclone separator comprises a separator body, and one side of the upper part of the cyclone separator body is provided with a gas-solid medium inlet communicated with a discharge hole of the slag granulating body; an air outlet is arranged at the top of the separator body, and an ash bucket is arranged at the bottom of the separator body.
Preferably, the nozzles of the nozzle array are supersonic nozzles, atomizing nozzles or gas-liquid two-fluid nozzles; preferably, the nozzle axial direction of the nozzle array is perpendicular to the side wall of the slag granulating body.
Preferably, the nozzles of the nozzle array are arranged in a plurality of rows and columns or are arranged in an arc shape; preferably, the upward and downward nozzles are staggered left and right; more preferably, the number of nozzles is gradually decreased or increased from top to bottom.
Preferably, the nozzles of the nozzle array are gas-liquid two-fluid nozzles; correspondingly, the water supply device is also provided with a nozzle water supply mechanism which comprises a fourth control valve, a water pump, a fifth control valve, a pressure gauge and a flowmeter which are sequentially arranged along the water conveying pipeline; the inlet end of the water delivery pipe is connected with a water source, and the outlet end of the water delivery pipe is connected with the inlet end pipe of the gas-liquid double-fluid nozzle.
The compressor pressurizes the air and then sends the air into the air storage tank, the air is sprayed into the slag granulating body by the air storage tank through a pipeline and a (supersonic) nozzle for granulating, and the liquid slag is granulated in the granulating body; the high-speed airflow sprayed by the supersonic nozzle impacts the liquid slag to break the slag, and rapidly exchanges heat with and cools the granulated slag particles, thereby facilitating rapid slag formation.
Compared with the traditional air quenching and water quenching processes, the utility model adopts the supersonic nozzle array mode to further improve the slag treatment capacity, and the spray of the fog drops improves the slag particle heat exchange effect, thereby reducing the waste of water resources.
Compared with the prior art, the utility model has the advantages that:
1. the high-speed jet sprayed by the high-speed gas nozzle breaks the blast furnace slag, so that the water resource consumption is reduced, the water pollution is reduced, meanwhile, the emission of harmful gas is reduced, the gas pipeline is not easy to wear and has low maintenance cost, and the cooled blast furnace slag is not required to be dried by using extra energy.
2. Compared with the air quenching process, the device ensures that the gas in the pipe can reach higher speed under the same pressure by arranging the high-speed gas nozzle with less energy consumption, has low cost and less noise pollution, and the cooling rate of the high-temperature slag is faster than that of the traditional air quenching, thereby being more beneficial to the formation of glass bodies, and the better the quality and the higher the content of the glass bodies, the higher the recycling rate of the blast furnace slag.
3. The mode of installing a plurality of high-speed gas nozzles at the bottom is adopted, so that high-speed airflow which is uniformly distributed is formed to exchange heat with slag, and the arrangement of the nozzle arrays and the heat exchange of slag are more sufficient. The gas flow fields formed by the arrays can uniformly and fully cover the flowing range of slag flow, so that the granulating effect is more uniform, and the slag forming effect is better.
4. The mode that a plurality of atomizing nozzles are arranged at the bottom of the slag granulating body is adopted, so that mist drop particles which are uniformly distributed are formed to exchange heat with slag, and compared with the common water flow impact, the heat exchange between the mist drop particles and the slag is more sufficient; and the spray of the fog drop particles provides a driving force for slag particles after gas quenching, so that the slag particles can be prevented from falling into the bottom of the device too early to generate a bonding phenomenon.
5. The high-speed gas is distributed in the form of a (supersonic) nozzle array, and a gas flow field formed by the array can uniformly and fully cover the flowing range of slag flow, so that the granulating effect is more uniform, and the slag forming effect is better.
6. According to the utility model, the waste heat recovery sections are designed to be arranged in multiple layers, slag particles and high-temperature air flow enter the heat exchange box body to carry out secondary waste heat gas recovery, heat exchange and gas-solid separation, so that the waste heat recovery efficiency is greatly improved, the slag particles can be rapidly cooled by the gas nozzles arranged at the bottom in an array manner, and the high-temperature air flow is separated, so that the waste heat of slag is fully recovered.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present utility model;
fig. 2 to 4 are schematic views showing the arrangement of nozzle arrays in embodiment 1 of the present utility model.
FIG. 5 is a schematic structural diagram of embodiment 2 of the present utility model;
FIG. 6 is a top view of a nozzle array in embodiment 2 of the present utility model;
FIG. 7 is a schematic structural diagram of embodiment 3 of the present utility model;
FIG. 8 is a schematic structural diagram of embodiment 4 of the present utility model;
fig. 9 is a schematic structural view of embodiment 5 of the present utility model.
Detailed Description
Referring to fig. 1, the apparatus for granulating blast furnace slag using a gas nozzle array according to the present utility model includes:
the slag granulating body 1 is of a box structure, the top of the slag granulating body is provided with a slag inflow port 11 and a steam outflow channel 12, and blast furnace slag 100 enters the slag granulating body 1 through a slag chute 13 and the slag inflow port 11;
the high-speed air injection mechanism 2 includes:
the device comprises a compressor 21, an air storage tank 22, an air transmission pipeline 23 connected with the air storage tank 22 and a nozzle array 24 connected with one end of the air transmission pipeline 23; a first control valve F1 and a flowmeter 25 are sequentially arranged in a gas pipeline 23 at the outlet end of the gas storage tank 22;
the air storage tank 22 is provided with a pressure gauge 26, an air inlet pipeline 27 and an air inlet valve F2;
the nozzle array 24 comprises a plurality of nozzles 241 and corresponding branch pipelines 242, and each branch pipeline 242 is connected to the gas pipeline 23 respectively; the nozzle 241 is provided at one side wall of the slag granulating body 1.
Preferably, the nozzle 241 of the nozzle array 24 is a supersonic nozzle, an atomizing nozzle, or a gas-liquid two-fluid nozzle; the nozzle 241 of the nozzle array 24 is axially perpendicular to the sidewall of the slag granulating body 1.
Referring to fig. 2 to 4, the nozzles 241 of the nozzle array 24 are arranged in a plurality of rows and columns.
Preferably, the nozzles 241 of the nozzle array 24 are arranged in a plurality of rows and columns, and the atomizing nozzles in the upper row and the lower row are staggered left and right.
Preferably, the nozzles 241 of the nozzle array 24 are arranged in a plurality of rows and columns, and the number of atomizing nozzles is gradually reduced or increased from top to bottom.
The high-speed jet sprayed by the high-speed gas nozzle breaks the blast furnace slag, so that the water resource consumption is reduced, the water pollution is reduced, meanwhile, the emission of harmful gas is reduced, the gas pipeline is not easy to wear and has low maintenance cost, and the cooled blast furnace slag is not required to be dried by using extra energy. Compared with the air quenching process, the device ensures that the gas in the pipe can reach higher speed under the same pressure by arranging the high-speed gas nozzle with less energy consumption, has low cost and less noise pollution, and the cooling rate of the high-temperature slag is faster than that of the traditional air quenching, thereby being more beneficial to the formation of glass bodies, and the better the quality and the higher the content of the glass bodies, the higher the recycling rate of the blast furnace slag. The mode of installing a plurality of high-speed gas nozzles at the bottom is adopted, so that high-speed airflow which is uniformly distributed is formed to exchange heat with slag, and the arrangement of the nozzle arrays and the heat exchange of slag are more sufficient. The gas flow fields formed by the arrays can uniformly and fully cover the flowing range of slag flow, so that the granulating effect is more uniform, and the slag forming effect is better.
Referring to fig. 5 and 6, which show embodiment 2 of the present utility model, in embodiment 2, the present utility model further includes: the nozzle atomizing mechanism 3 comprises a second control valve F2, a water pump 31, a third control valve F3, a pressure gauge 32, a flowmeter 33 and a plurality of atomizing nozzles 34 which are sequentially arranged along the water conveying pipeline 30; the inlet end of the water pipe 30 is connected with a water source 200; the atomizing nozzles are arranged in at least two rows at the bottom of the slag granulating body 1, and the outlet direction of the atomizing nozzle 34 is opposite to the blast furnace slag flowing in from the slag inflow port 11.
Referring to fig. 7, which shows embodiment 3 of the present utility model, in embodiment 3, the nozzle 241 of the nozzle array 24 is a gas-liquid two-fluid nozzle; correspondingly, a nozzle water supply mechanism 6 is also arranged, and comprises a fourth control valve F4, a water pump 61, a fifth control valve F5, a pressure gauge 62 and a flowmeter 63 which are sequentially arranged along the water conveying pipeline 60; the inlet end of the water pipe 60 is connected with a water source 200, and the outlet end of the water pipe is connected with the inlet end pipe of the gas-liquid two-fluid nozzle.
Referring to fig. 8, which shows embodiment 4 of the present utility model, in embodiment 4, the present utility model further includes a waste heat recovery system 4 including:
a heat exchange box 41, the upper part of one side wall of which is provided with a feed inlet communicated with the discharge port of the slag granulating body 1; a secondary heat exchange air flow outlet 411 at the top of the heat exchange box 41; a plurality of layers of perforated bed plates 42 are arranged in the height direction in the heat exchange box body 41; the bottom of the heat exchange box 41 is provided with a slag particle outlet 412;
the gas nozzle array 43 is disposed at the bottom of the heat exchange box 41 and below the perforated bed plate 42, and the gas nozzle outlet corresponds to the perforated bed plate 42 upward.
Preferably, the perforated bed plates 42 are arranged in a zigzag shape in the height direction in the heat exchange box 41, and the perforated bed plates 42 which are arranged in an up-down inclined manner are corresponding to each other from head to tail.
The slag granulating process is carried out in the slag granulating body, the high-speed gas nozzle assembly and the atomizing nozzle array provide main power for slag crushing and granulating and perform primary heat exchange, and the waste heat recovery system separates slag particles from gas and performs secondary heat exchange.
The working process is as follows:
the high-speed gas nozzle assembly provides uniform high-speed gas flow to uniformly crush the falling blast furnace slag, so that high-temperature slag particles in parabolic motion are obtained; the atomizing nozzle array sprays water mist on the bottom of the slag granulating body to spray the slag particles which move in a parabolic manner, so that on one hand, the heat exchange efficiency is increased to quickly cool the slag particles, and on the other hand, an impetus is applied to blast furnace slag; and a slag particle collecting section is arranged at the tail part of the slag particle body device, slag particles and high-temperature air flow enter a heat exchange box body of the waste heat recovery system to carry out gas-solid separation, the slag particles pass through the multi-layer perforated bed plate and fully exchange heat with cold air sprayed out by air nozzles of a lower air nozzle array, the heat exchange air flows out from an upper outlet, and cold slag falls from a lower outlet of the heat exchange box body.
Starting a compressor, pressurizing gas by the compressor, feeding the gas into a gas storage tank, providing gas with stable pressure to a nozzle array (supersonic gas) by the gas storage tank, and injecting high-speed airflow into a slag granulating body by the nozzle to crush slag entering from a slag inflow port; meanwhile, a water pump is started, the water pump pressurizes water in the water delivery pipeline, then the water is sprayed out through an atomization nozzle, sprayed fog drop particles impact granulated slag particles, and the slag particles are rapidly cooled and become stable small particles; the mixed jet flow sprayed by the nozzle array nozzle and the atomizing nozzle is impacted to completely generate air and steam of high-temperature slag, and the air and the steam flow out from the upper part of the slag granulating body to serve as waste heat recovery resources.
Referring to fig. 9, which shows embodiment 5 of the present utility model, in embodiment 5, the waste heat recovery system 4 employs a cyclone 5.
The cyclone separator 5 comprises a separator body 51, and one side of the upper part of the cyclone separator is provided with a gas-solid medium inlet 511 communicated with the discharge port 14 of the slag granulating body 1; an air outlet 512 is arranged at the top of the separator body 51, and an ash bucket 52 is arranged at the bottom of the separator body 51.
The slag particles and the high-temperature air flow enter a cyclone separator 5 for gas-solid separation. The cyclone separator can separate high-temperature clean airflow, so that slag waste heat is fully recovered.
Claims (12)
1. An apparatus for granulating blast furnace slag using an array of gas nozzles, comprising:
the slag granulating body is of a box structure, and a slag inflow port and a steam outflow channel are arranged at the top of the slag granulating body;
a high-speed air injection mechanism comprising:
the device comprises a compressor, an air storage tank, an air pipeline connected with the air storage tank and a nozzle array connected with one end of the air pipeline; a first control valve and a flowmeter are sequentially arranged in a gas pipeline at the outlet end of the gas storage tank; the air storage tank is provided with a pressure gauge, an air inlet pipeline and an air inlet valve;
the nozzle array comprises a plurality of nozzles and corresponding branch pipelines, and each branch pipeline is connected to the gas transmission pipeline respectively; the nozzle is arranged on one side wall of the slag granulating body.
2. The apparatus for granulating blast furnace slag using a gas nozzle array as set forth in claim 1, further comprising:
the nozzle atomizing mechanism comprises a second control valve, a water pump, a third control valve, a pressure gauge, a flowmeter and a plurality of atomizing nozzles which are sequentially arranged along the water conveying pipeline; the inlet end of the water pipe is connected with a water source; the atomizing nozzles are arranged in at least two rows at the bottom of the slag granulating body, and the outlet direction of the atomizing nozzles is opposite to blast furnace slag flowing in from the slag inflow port.
3. The apparatus for granulating blast furnace slag using a gas nozzle array as claimed in claim 1 or 2, further comprising a waste heat recovery system comprising:
the upper part of one side wall of the heat exchange box body is provided with a feed inlet communicated with the discharge port of the slag granulating body; a secondary heat exchange airflow outlet at the top of the heat exchange box body; a plurality of layers of perforated bed plates are arranged in the height direction in the heat exchange box body; the bottom of the heat exchange box body is provided with a slag particle outlet;
the gas nozzle array is arranged at the inner bottom of the heat exchange box body and below the perforated bed plate, and the gas nozzle outlet corresponds to the perforated bed plate upwards; or alternatively, the process may be performed,
the waste heat recovery system adopts a cyclone separator.
4. The apparatus for granulating blast furnace slag using a gas nozzle array as claimed in claim 3, wherein the perforated deck is arranged in a zigzag shape in a height direction in the heat exchange box.
5. The apparatus for granulating blast furnace slag using a gas nozzle array according to claim 4, wherein the cyclone separator comprises a separator body, and a gas-solid medium inlet communicating with a discharge port of the slag granulating body is provided at one side of an upper portion thereof; an air outlet is arranged at the top of the separator body, and an ash bucket is arranged at the bottom of the separator body.
6. The apparatus for granulating blast furnace slag using a gas nozzle array as claimed in claim 1, wherein the nozzle of the nozzle array is a supersonic nozzle, an atomizing nozzle or a gas-liquid two-fluid nozzle.
7. The apparatus for granulating blast furnace slag using a gas nozzle array according to claim 6, wherein the nozzle axis of the nozzle array is perpendicular to the slag granulating body side wall.
8. The apparatus for granulating blast furnace slag by using a gas nozzle array as claimed in claim 1, 6 or 7, wherein the nozzles of the nozzle array are arranged in a plurality of rows and columns or are arranged in an arc shape.
9. The apparatus for granulating blast furnace slag using a gas nozzle array according to claim 8, wherein the nozzles of the nozzle array are arranged in a plurality of rows and columns or in an arc shape, and the upward and downward nozzles are staggered from side to side.
10. The apparatus for granulating blast furnace slag by using a gas nozzle array according to claim 8, wherein the nozzles of the nozzle array are arranged in a plurality of rows and columns or in an arc shape, and the number of the nozzles is gradually decreased or increased from top to bottom.
11. The apparatus for granulating blast furnace slag by using a gas nozzle array according to claim 9, wherein the nozzles of the nozzle array are arranged in a plurality of rows and columns or in an arc shape, and the number of the nozzles is gradually decreased or increased from top to bottom.
12. The apparatus for granulating blast furnace slag using a gas nozzle array as claimed in claim 1, wherein the nozzles of the nozzle array are gas-liquid two-fluid nozzles; correspondingly, the water supply device is also provided with a nozzle water supply mechanism which comprises a fourth control valve, a water pump, a fifth control valve, a pressure gauge and a flowmeter which are sequentially arranged along the water conveying pipeline; the inlet end of the water delivery pipe is connected with a water source, and the outlet end of the water delivery pipe is connected with the inlet end pipe of the gas-liquid double-fluid nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223367914.0U CN219174525U (en) | 2022-12-13 | 2022-12-13 | Device for granulating blast furnace slag by using gas nozzle array |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223367914.0U CN219174525U (en) | 2022-12-13 | 2022-12-13 | Device for granulating blast furnace slag by using gas nozzle array |
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