CN112375902A - Experimental system for simulating pelletizing belt type roasting machine and using method thereof - Google Patents
Experimental system for simulating pelletizing belt type roasting machine and using method thereof Download PDFInfo
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- CN112375902A CN112375902A CN202110019156.4A CN202110019156A CN112375902A CN 112375902 A CN112375902 A CN 112375902A CN 202110019156 A CN202110019156 A CN 202110019156A CN 112375902 A CN112375902 A CN 112375902A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005453 pelletization Methods 0.000 title claims abstract description 7
- 239000008188 pellet Substances 0.000 claims abstract description 173
- 238000001816 cooling Methods 0.000 claims abstract description 104
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000003546 flue gas Substances 0.000 claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 52
- 239000000428 dust Substances 0.000 claims abstract description 43
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims description 152
- 238000001035 drying Methods 0.000 claims description 67
- 238000002156 mixing Methods 0.000 claims description 37
- 238000002791 soaking Methods 0.000 claims description 30
- 239000002912 waste gas Substances 0.000 claims description 27
- 238000004321 preservation Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 239000000779 smoke Substances 0.000 claims description 13
- 239000010425 asbestos Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
Abstract
The invention discloses an experimental system for simulating a pelletizing belt type roasting machine and a use method thereof, wherein the experimental system comprises: air supply fan, flow control device, the gas jar, gas flow control device, the nozzle, the reposition of redundant personnel combustion chamber, go up sealed cowling I, the benchmark is baked over a slow fire beaker strutting arrangement, lower sealed cowling I, cooling dust collector I, exhaust fan I, air-blast fan I, cooling dust collector II, exhaust fan II, go up sealed cowling II, the circulation is baked over a slow fire beaker strutting arrangement, lower sealed cowling II, cooling dust collector III, exhaust fan II, air-blast fan II. The invention provides the circulating flue gas for the pellet production of the circulating roasting cup by utilizing the high-temperature flue gas generated by the reference roasting cup, can simulate the actual production process of the belt type roasting machine more truly, can be compared with the pellet production condition without adopting the circulating flue gas, has various system functions, high energy utilization rate and more practical guiding significance of experimental results.
Description
Technical Field
The invention relates to the technical field of iron ore pellet production experimental equipment, in particular to an experimental system for simulating a pellet belt type roasting machine and a using method thereof.
Background
The iron ore pellets have the advantages of uniform granularity, high strength, suitability for long-distance transportation and storage, high iron grade, good metallurgical performance, contribution to improving the air permeability of a material column during smelting, reducing the coke ratio and the like, and are ideal furnace burden of a modern blast furnace.
At present, the production process of iron ore pellets in the world mainly comprises a shaft furnace process, a grate-rotary kiln process and a belt machine process. In both the shaft furnace process and the grate-rotary kiln process, because of the design, the pellets need to continuously fall or reverse in the processing process, and the high-proportion hematite pellets or the solvent pellets are not suitable to be produced.
The belt type pelletizing process design integrates the procedures of drying, preheating, roasting and cooling on a belt type machine, raw pellets do not need to fall or turn over in the process from the end of spreading to the generation of finished pellets, and the quality of the pellets in the belt type pelletizing process is better guaranteed; the belt type machine adopts burners at two sides of the trolley to inject fuel for supplying heat, and the preheating and roasting temperature is easy to control.
The experimental device for simulating the pellet belt type roasting machine mainly comprises a small-sized bedroom tube furnace and the experimental pellet belt type roasting machine. The small-sized bedroom tube furnace is a static simulation method, has small scale and large error, and is difficult to reduce the production process of the belt type roasting machine. Most of the existing experimental pellet belt type roasting machines directly adopt a combustion chamber gas distribution mode to simulate the pellet production process, and the actual production process of the pellets of the existing belt type roasting machines needs flue gas circulation. Therefore, the existing laboratory pellet straight grate cannot well simulate the actual reaction process of pellets of the straight grate with circulating flue gas.
Disclosure of Invention
The invention aims to provide an experimental system for simulating a pellet straight grate and a using method thereof, so as to overcome the defects that the existing laboratory pellet straight grate cannot well simulate the actual reaction process of pellets of a straight grate adopting circulating flue gas and the like.
The invention adopts the following technical scheme:
an experimental system for simulating a pellet belt type roasting machine comprises an air supply fan, a flow control device, a gas tank, a gas flow control device, a burner, a split-flow combustion chamber, an upper sealing cover I, a reference roasting cup supporting device, a lower sealing cover I, a cooling and dust removing device I, an air draft fan I, an air blast fan I, a cooling and dust removing device II, an air draft fan II, an upper sealing cover II, a circulating roasting cup supporting device, a lower sealing cover II, a cooling and dust removing device III, an air draft fan III and an air blast fan II; the air supply fan is connected with the burner through the flow control device, the gas tank is connected with the burner through the gas flow control device, the burner is connected with the flow splitting combustion chamber, and the flow splitting combustion chamber comprises a hot air chamber I and a hot air chamber II; the hot air chamber I is sequentially connected with the upper sealing cover I through a hot air control valve I-I, a cold air charging valve I and a hot air control valve I-II through pipelines, the upper sealing cover I is sequentially connected with the cooling dust removal device I and the air draft fan I through a waste gas control valve I, the reference baking cup is rotatably arranged between the upper sealing cover I and the lower sealing cover I through a reference baking cup supporting device, the central axes of the upper sealing cover I, the reference baking cup and the lower sealing cover I are positioned on the same straight line, the lower sealing cover I is connected with the air blast fan I through a cooling air control valve I, the lower sealing cover I is connected with the pipeline between the cold air charging valve I and the hot air control valve I-II through a hot air control valve I-III, and the lower sealing cover I is sequentially connected with the cooling fan I through a flue gas control valve I and a circulating hot air control valve II-I The dust removal device II is connected with the air exhaust fan II; the hot air chamber II is sequentially connected with the upper sealing cover II through a hot air control valve II-I, a cold air mixing valve II and a hot air control valve II-II through pipelines, the upper sealing cover II is sequentially connected with a cooling and dust removing device III and an air draft fan III through a waste gas control valve II, the circulating baking cup is rotatably arranged between the upper sealing cover II and the lower sealing cover II through the circulating baking cup supporting device, the central axes of the upper sealing cover II, the circulating baking cup and the lower sealing cover II are positioned on the same straight line, the lower sealing cover II is connected with the air draft fan II through a cooling air control valve II, the lower sealing cover II is further sequentially connected with the cooling and dust removing device II and the air draft fan II through a smoke gas control valve II, the lower sealing cover II is connected with the pipeline between the smoke gas control valve I and the circulating hot air control valve II-II through a circulating hot air control valve II-II, and the lower sealing cover II is connected with a pipeline between the cold mixing valve II and the hot air control valve II through a circulating hot air control valve II-II and a circulating hot air control valve II-III.
Preferably, the pipeline between the cold air mixing valve I and the hot air control valves I-II is connected with the pipeline between the cold air mixing valve II and the hot air control valves II-II through circulating hot air control valves II-IV.
Further, the upper sealing cover I comprises an upper sealing cover body I and an upper heat-insulating layer I, the upper heat-insulating layer I is arranged on the inner wall of the upper sealing cover body I, and an upper sealing cover thermodetector I is arranged inside the upper sealing cover I; the upper sealing cover II comprises an upper sealing cover body II and an upper heat-insulating layer II, the upper heat-insulating layer II is arranged on the inner wall of the upper sealing cover body II, and an upper sealing cover temperature measuring instrument II is arranged inside the upper sealing cover II.
Furthermore, the upper sealing cover I and the reference roasting cup and the lower sealing cover I and the reference roasting cup are in sealing connection through asbestos gaskets, and the upper sealing cover II and the circulating roasting cup and the lower sealing cover II and the circulating roasting cup are also in sealing connection through asbestos gaskets.
Furthermore, the reference roasting cup consists of a reference roasting cup body and a reference roasting cup heat-insulating lining, the circulating roasting cup consists of a circulating roasting cup body and a circulating roasting cup heat-insulating lining, and the bottoms of the reference roasting cup and the circulating roasting cup are both provided with high-temperature-resistant grate bars.
Further, the lower seal cover I comprises a lower seal cover body I and a lower heat preservation layer I, the lower heat preservation layer I is arranged on the inner wall of the lower seal cover body I, the lower seal cover I is internally provided with the lower seal cover temperature measuring instrument I, the lower seal cover II comprises a lower seal cover body II and a lower heat preservation layer II, the lower heat preservation layer II is arranged on the inner wall of the lower seal cover body II, and the lower seal cover II is internally provided with the lower seal cover temperature measuring instrument II.
The basic roasting cup is fixed on the basic roasting cup supporting device through a fastening piece, and the circulating roasting cup is also fixed on the circulating roasting cup supporting device through a fastening piece.
The reference roasting cup supporting device and the circulating roasting cup supporting device have the same structure and respectively comprise a support column and a vertical rotating support, wherein the top end of the support column is provided with a supporting seat capable of rotating on a horizontal plane, and the vertical rotating support is connected to the supporting seat in a manner of moving up and down through a bolt.
The use method of the experimental system for simulating the pellet straight grate roasting machine comprises the following steps: (1) preparing combustion to enable the shunting combustion chamber to reach the specified temperature; (2) preparing a reference roasting cup raw material, and enabling central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be located on the same straight line; (3) the blast drying stage of the standard roasting cup is simulated; (4) performing air draft drying on the reference roasting cup, and simulating an air draft drying stage of the belt type roasting machine; (5) preheating the pellets in the reference roasting cup, and simulating the preheating stage of the belt type roasting machine; (6) preparing raw materials of the circulating roasting cup, and enabling the central axes of the upper sealing cover II, the circulating roasting cup and the lower sealing cover II to be located on the same straight line; (7) pre-roasting the pellets in the reference roasting cup, and simulating the roasting stage of a belt type roasting machine; (8) circulating roasting flue gas of the reference roasting cup to the bottom of the circulating roasting cup, and simulating a forced air drying stage of a belt type roasting machine adopting the circulating flue gas; (9) circulating roasting flue gas of the reference roasting cup to the top of the circulating roasting cup, and simulating an air draft drying stage of a belt type roasting machine adopting the circulating flue gas; (10) carrying out uniform heating on the pellets in the reference roasting cup, and simulating the uniform heating stage of the belt type roasting machine; (11) preheating pellets in a circulating roasting cup, circulating pellet roasting flue gas in a reference roasting cup to the top of the circulating roasting cup, and simulating a preheating stage of a belt type roasting machine adopting the circulating flue gas; (12) cooling the pellets in the reference roasting cup, and simulating the cooling stage of the belt type roasting machine; (13) roasting the pellets in the circulating roasting cup, and simulating the roasting stage of a belt type roasting machine adopting circulating flue gas; (14) circulating roasting cup pellet soaking, and simulating a soaking stage of a belt type roasting machine adopting circulating flue gas; (15) and cooling the pellets in the circulating roasting cup, and simulating the cooling stage of the belt roasting machine by adopting circulating flue gas.
The application method of the experimental system for simulating the pelletizing belt type roasting machine comprises the following specific processes:
s1, opening a hot air control valve III, an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, and starting an igniter to enable the flow-dividing combustion chamber to reach the specified temperature;
s2, loading the green ball material into a reference roasting cup, and adjusting the reference roasting cup to enable the central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be located on the same straight line through a reference roasting cup supporting device;
s3, opening a hot air control valve I-I, a hot air mixing valve I, a hot air control valve I-III, a waste gas control valve I, a cooling dust removal device I and an exhaust fan I to provide hot air for pellet blast drying, adjusting the hot air control valve III, the hot air control valve I-I and the hot air mixing valve I to enable the air temperature and the air volume entering a reference roasting cup to reach specified values of blast drying, and finishing the blast drying after reaching specified blast drying time so as to simulate the blast drying stage of the belt type roasting machine;
s4, opening a hot air control valve I-II, a smoke control valve I, a circulating hot air control valve II-I, a cooling dust removal device II and an air draft fan II, closing the hot air control valve I-III, a waste gas control valve I, the cooling dust removal device I and the air draft fan I, and adjusting the hot air control valve III, the hot air control valve I-I and the air draft cooling valve I to enable the air temperature and the air volume entering a standard roasting cup to reach an air draft drying specified value, and after reaching specified air draft drying time, finishing air draft drying so as to simulate an air draft drying stage of a belt type roasting machine;
s5, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a specified pellet preheating value, and after the specified pellet preheating time is reached, completing pellet preheating so as to simulate the preheating stage of the belt type roasting machine;
s6, placing the green ball material into a circulating roasting cup, and adjusting the position of the circulating roasting cup through a circulating roasting cup supporting device to enable the central axes of the upper sealing cover II, the circulating roasting cup and the lower sealing cover II to be located on the same straight line;
s7, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach specified values of pellet roasting, and after specified pellet roasting time is reached, finishing the roasting of the pellets so as to simulate the roasting stage of a belt type roasting machine;
s8, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-II, a waste gas control valve II, a cooling and dedusting device III, an air draft fan III, a cooling air control valve II and a blast fan II, circulating pellet roasting flue gas of the basic roasting cup to the bottom of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach a specified value of pellet blast drying, and finishing the blast drying after reaching specified blast drying time, thereby simulating the blast drying stage of a belt type roasting machine adopting the circulating flue gas;
s9, opening a circulating hot air control valve II-III, a hot air control valve II-II, a cooling air exchanging valve II and a smoke control valve II, closing a waste gas control valve II, a cooling dust removal device III, an air draft fan III, a circulating hot air control valve II-II, a cooling air control valve II and an air blast fan II, adjusting the circulating hot air control valve II-I, the circulating hot air control valve II-III and the cooling air exchanging valve II, circulating pellet roasting smoke of the basic roasting cup to the top of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach the specified value of pellet air draft drying, and finishing air draft drying after reaching the specified air draft drying time, thereby simulating the air draft drying stage of the belt type roasting machine adopting circulating smoke;
s10, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a specified pellet soaking value, and after reaching specified pellet soaking time, finishing pellet soaking so as to simulate a belt type roasting machine soaking stage;
s11, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-III and a hot air mixing valve II, circulating pellet roasting flue gas of the reference roasting cup to the top of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach a specified pellet preheating value, and after reaching specified pellet preheating time, finishing pellet preheating so as to simulate the preheating stage of the belt type roasting machine adopting the circulating flue gas;
s12, closing a hot air control valve I-I, a hot air exchange valve I and a flue gas control valve I, opening a waste gas control valve I, a cooling dust removal device I, an air draft fan I, a cooling air control valve I and an air blast fan I, cooling cold air enters a pellet material layer from the bottom of the standard roasting cup to be cooled, and after the specified pellet cooling time is reached, the pellet cooling is finished, so that the cooling stage of the belt type roasting machine is simulated;
s13, closing a circulating hot air control valve II-III, opening a hot air control valve II-I, a cold air mixing valve II, a circulating hot air control valve II-IV, adjusting a hot air control valve II-I, a cold air mixing valve II, a hot air control valve I-II and an exhaust gas control valve I, so that the air temperature and the air quantity entering a circulating roasting cup reach a specified value of roasting of the pellets, and after the specified roasting time of the pellets is reached, the roasting of the pellets is finished, thereby simulating the roasting stage of a belt type roasting machine adopting circulating flue gas;
s14, after the pellets in the circulating roasting cup are roasted and sintered, adjusting a hot air control valve II-I, a hot air exchange valve II, a hot air control valve I-II and a waste gas control valve I to enable the air temperature and the air quantity entering the circulating roasting cup to reach a specified pellet soaking value, and after reaching the specified pellet soaking time, finishing the pellet soaking so as to simulate the soaking stage of the belt type roasting machine adopting circulating flue gas;
s15, after the pellet heat equalization of the circulating roasting cup is finished, closing an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, opening a hot air control valve II-I, a heat exchange air valve II, a circulating hot air control valve II-IV and a hot air control valve II-II, opening a cooling air control valve II, a blast fan II and a waste gas control valve II, sequentially connecting a cooling dust removal device III and an air draft fan III, allowing cold air to enter a pellet material layer from the bottom of the circulating roasting cup for cooling, and after the specified pellet cooling time is reached, finishing the cooling of the pellets, thereby simulating the cooling stage of the belt type roasting machine adopting circulating flue gas.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
the two pellet roasting cup combined experiment system is adopted, the high-temperature flue gas generated in the pellet production process of the reference roasting cup is used for providing the circulating flue gas for the pellet production of the circulating roasting cup, the actual production process of the belt type roasting machine can be simulated more truly, meanwhile, the system can be compared with the pellet production condition without adopting the circulating flue gas, the system has various functions, the waste heat of the flue gas is recycled, the energy is saved, and the result has more practical guiding significance.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details. Well-known components, methods and processes are not described in detail below.
Referring to fig. 1, an experimental system for simulating a pellet belt type roasting machine comprises an air supply fan 1, a flow control device 2, a gas tank 3, a gas flow control device 4, a burner 5, a split combustion chamber 6, an upper sealing cover I14, a reference roasting cup 16, a reference roasting cup supporting device 19, a lower sealing cover I18, a cooling and dust removing device I11, an air draft fan I12, an air blast fan I22, a cooling and dust removing device II 42, an air draft fan II 43, an upper sealing cover II 31, a circulating roasting cup 33, a circulating roasting cup supporting device 36, a lower sealing cover II 35, a cooling and dust removing device III 29, an air draft fan III 30 and an air blast fan II 40.
The air supply fan 1 is connected with the burner 5 through the flow control device 2, the gas tank 3 is connected with the burner 5 through the gas flow control device 4, the burner 5 is connected with the shunting combustion chamber 6, and the shunting combustion chamber 6 comprises a hot air chamber I61 and a hot air chamber II 62.
The hot air chamber I61 is sequentially connected with the upper sealing cover I14 through a pipeline via a hot air control valve I-I7, a cold air valve I8 and a hot air control valve I-II 9, the upper sealing cover I14 is sequentially connected with the cooling and dust removing device I11 and the air draft fan I12 through a waste gas control valve I10, the lower sealing cover I18 is connected with the air blast fan I22 through a cooling air control valve I21, the lower sealing cover I18 is connected with a pipeline between the cold air valve I8 and the hot air control valve I-II 9 through a hot air control valve I13, and the lower sealing cover I18 is sequentially connected with the cooling and dust removing device II 42 and the air draft fan II 43 through a flue gas control valve I20 and a circulating hot air control valve II-I41.
The hot air chamber II 62 is sequentially connected with the upper sealing cover II 31 through a hot air control valve II-I23, a cold air charging valve II 24 and a hot air control valve II-II 27 through pipelines, the upper sealing cover II 31 is sequentially connected with a cooling and dust removing device III 29 and an air draft fan III 30 through a waste gas control valve II 28, the lower sealing cover II 35 is connected with a blast fan II 40 through a cooling air control valve II 39, the lower sealing cover II 35 is sequentially connected with a cooling and dust removing device II 42 and an air draft fan II 43 through a flue gas control valve II 38, the lower sealing cover II 35 is connected with the pipeline between the flue gas control valve I20 and the hot air circulating control valve II-I41 through a hot air circulating control valve II-II 37 and a hot air circulating control valve II-III 26, and the pipeline between the cold air charging valve II 24 and the hot air control valve II-II 27 through a hot air circulating control valve II-II 37 and a hot air circulating control valve II-III 26 The pipelines are connected.
And the pipeline between the cold mixing valve I8 and the hot air control valves I-II 9 is connected with the pipeline between the cold mixing valve II 24 and the hot air control valves II-II 27 through circulating hot air control valves II-IV 25.
The central axes of the upper sealing cover I14, the reference roasting cup 16 and the lower sealing cover I18 are positioned on the same straight line, and asbestos gaskets are adopted for sealing connection between the upper sealing cover I14 and the reference roasting cup 16 and between the lower sealing cover I18 and the reference roasting cup 16. The central axes of the upper sealing cover II 31, the circulating roasting cup 33 and the lower sealing cover II 35 are positioned on the same straight line, and asbestos gaskets are adopted for sealing connection between the upper sealing cover II 31 and the circulating roasting cup 33 and between the lower sealing cover II 35 and the circulating roasting cup 33.
The upper sealing cover I14 comprises an upper sealing cover body I and an upper heat preservation layer I, the upper heat preservation layer I is arranged on the inner wall of the upper sealing cover body I, an upper sealing cover temperature measuring instrument I15 is arranged inside the upper sealing cover I14, the upper sealing cover II 31 comprises an upper sealing cover body II and an upper heat preservation layer II, the upper heat preservation layer II is arranged on the inner wall of the upper sealing cover body II, and an upper sealing cover temperature measuring instrument II 32 is arranged inside the upper sealing cover II 31.
The reference roasting cup 16 is composed of a reference roasting cup body and a reference roasting cup heat-insulating lining, the circulating roasting cup 33 is composed of a circulating roasting cup body and a circulating roasting cup heat-insulating lining, and the bottoms of the reference roasting cup 16 and the circulating roasting cup 33 are both provided with high-temperature-resistant grate bars.
The lower sealing cover I18 comprises a lower sealing cover body I and a lower heat preservation layer I, the lower heat preservation layer I is arranged on the inner wall of the lower sealing cover body I, and the lower sealing cover temperature measuring instrument I17 is arranged inside the lower sealing cover I18. The lower sealing cover II 35 comprises a lower sealing cover body II and a lower heat preservation layer II, the lower heat preservation layer II is arranged on the inner wall of the lower sealing cover body II, and the lower sealing cover temperature measuring instrument II 34 is arranged inside the lower sealing cover II 35.
The reference roasting cup 16 is fixed to the reference roasting cup support 19 by fasteners, and the circulating roasting cup 33 is fixed to the circulating roasting cup support 36 by fasteners. The reference cup supporting unit 19 and the circulating beaker supporting unit 36 have the same structure, and each of them includes a support column 191 and a vertical rotating bracket 192, a support base 193 which can rotate on a horizontal plane is provided at the top end of the support column 191, and the vertical rotating bracket 192 is connected to the support base 193 by a bolt so as to be movable up and down.
The use method of the experimental system for simulating the pellet belt type roasting machine comprises the following steps:
(1) preparing a combustion chamber: opening a hot air control valve III 44, an air supply fan 1, a flow control device 2, a gas tank 3, a gas flow control device 4 and a burner 5, and starting an igniter to enable a shunting combustion chamber 6 to reach a specified temperature;
(2) preparing a reference roasting cup raw material: raw ball materials are loaded into a reference roasting cup 16, and the position of the reference roasting cup 16 is adjusted to be positioned on the same straight line through the central axes of an upper sealing cover I14, the reference roasting cup 16 and a lower sealing cover I18 through a reference roasting cup supporting device 19;
(3) standard beaker air drying: opening a hot air control valve I-I7, a hot air mixing valve I8, a hot air control valve I-III 13, a waste gas control valve I10, a cooling dust removal device I11 and an air draft fan I12 to provide hot air for pellet air blast drying, adjusting a hot air control valve III 44, a hot air control valve I-I7 and a hot air mixing valve I8 to enable the air temperature and the air quantity entering a reference roasting cup 16 to reach an appointed value of air blast drying, and finishing the air blast drying after reaching the appointed air blast drying time so as to simulate the air blast drying stage of a belt type roasting machine;
(4) performing air draft drying on a standard roasting cup: after the air blowing drying of the reference roasting cup is finished, opening a hot air control valve I-II 9, a smoke control valve I20, a circulating hot air control valve II-I41, a cooling dust removal device II 42 and an air draft fan II 43, closing the hot air control valve I-III 13, a waste gas control valve I10, a cooling dust removal device I11 and an air draft fan I12, and adjusting a hot air control valve III 44, a hot air control valve I-I7 and an air mixing valve I8 to enable the air temperature and the air quantity entering the reference roasting cup 16 to reach an appointed value of air draft drying, and after the appointed air draft drying time is reached, finishing the air draft drying so as to simulate the air draft drying stage of a belt type roasting machine;
(5) preheating pellets in a standard roasting cup: after the air pumping and drying of the reference roasting cup are finished, the air supply fan 1, the flow control device 2, the gas tank 3, the gas flow control device 4 and the hot air control valve III 44 are adjusted to enable the temperature in the shunting combustion chamber 6 to reach a specified temperature, the hot air control valve III 44, the hot air control valves I-I7 and the cold air mixing valve I8 are adjusted to enable the air temperature and the air volume entering the reference roasting cup 16 to reach a specified pellet preheating value, and after the specified pellet preheating time is reached, the pellet preheating is finished, so that the preheating stage of the belt type roasting machine is simulated;
(6) preparing a reference roasting cup raw material: after the preheating of the reference roasting cup pellets is finished, the green pellet materials are loaded into a circulating roasting cup 33, and the position of the circulating roasting cup 33 is adjusted to be in the same straight line through central axes of an upper sealing cover II 31, the circulating roasting cup 33 and a lower sealing cover II 35 by a circulating roasting cup supporting device 36;
(7) roasting the pellets in the standard roasting cup: after the preheating of the pellets in the reference roasting cup is finished, adjusting an air supply fan 1, a flow control device 2, a gas tank 3, a gas flow control device 4 and a hot air control valve III 44 to enable the temperature in a shunting combustion chamber 6 to reach a specified value, adjusting the hot air control valve III 44, the hot air control valves I-I7 and a cold air mixing valve I8 to enable the air temperature and the air volume entering the reference roasting cup 16 to reach specified values of pellet roasting, and after the specified pellet roasting time is reached, finishing the roasting of the pellets so as to simulate the roasting stage of a belt type roasting machine;
(8) and (3) drying by air blowing of a circulating baking cup: when the pellet roasting of the reference roasting cup starts, adjusting a circulating hot air control valve II-I41, a circulating hot air control valve II-II 37, a waste gas control valve II 28, a cooling dust removal device III 29, an air draft fan III 30, a cooling air control valve II 39 and an air blast fan II 40, circulating pellet roasting flue gas of the reference roasting cup 16 to the bottom of the circulating roasting cup 33, enabling the air temperature and the air quantity entering the circulating roasting cup 33 to reach a specified value of pellet blast drying, and after reaching specified blast drying time, finishing the blast drying so as to simulate the blast drying stage of a belt type roasting machine adopting the circulating flue gas;
(9) circulating roasting cup air draft drying: after the air blowing and drying of the circulating roasting cup are finished, opening a circulating hot air control valve II-III 26, a hot air control valve II-II 27, a cold air mixing valve II 24 and a flue gas control valve II 38, closing a waste gas control valve II 28, a cooling dust removal device III 29, an air draft fan III 30, a circulating hot air control valve II-II 37, a cooling air control valve II 39, a blower fan II 40, adjusting a circulating hot air control valve II-I41, a circulating hot air control valve II-III 26 and a cold air mixing valve II 24, circulating the pellet roasting flue gas of the reference roasting cup 16 to the top of the circulating roasting cup 33, so that the air temperature and the air quantity entering the circulating roasting cup 33 reach the specified value of pellet air draft drying and reach the specified air draft drying time, after the air draft drying is finished, simulating an air draft drying stage of the belt type roasting machine adopting circulating flue gas;
(10) pellet soaking in a standard baking cup: after the pellets in the reference roasting cup are roasted and sintered, the air supply fan 1, the flow control device 2, the gas tank 3, the gas flow control device 4 and the hot air control valve III 44 are adjusted to enable the temperature in the shunting combustion chamber 6 to reach the specified temperature, the hot air control valve III 44, the hot air control valves I-I7 and the cold air mixing valve I8 are adjusted to enable the air temperature and the air volume entering the reference roasting cup 16 to reach the specified values of pellet soaking, and after the specified pellet soaking time is reached, the pellet soaking is finished, so that the soaking stage of a belt type roasting machine is simulated;
(11) preheating pellets in a circulating baking cup: after the air pumping and drying of the circulating roasting cup are finished, adjusting a circulating hot air control valve II-I41, a circulating hot air control valve II-III 26 and a hot air mixing valve II 24, circulating the pellet roasting flue gas of the reference roasting cup 16 to the top of the circulating roasting cup 33, enabling the air temperature and the air quantity entering the circulating roasting cup 33 to reach a specified pellet preheating value, and after a specified pellet preheating time is reached, finishing the pellet preheating so as to simulate the preheating stage of a belt type roasting machine adopting the circulating flue gas;
(12) cooling the pellet in the standard roasting cup: after the heat equalization of the pellets in the reference roasting cup is finished, closing a hot air control valve I-I7, a hot air exchange valve I8 and a flue gas control valve I20, opening a waste gas control valve I10, a cooling and dust removal device I11, an air draft fan I12, a cooling air control valve I21 and an air blast fan I22, allowing cold air to enter a pellet material layer from the bottom of the reference roasting cup 16 for cooling, and after the specified pellet cooling time is reached, finishing the cooling of the pellets so as to simulate the cooling stage of a belt type roasting machine;
(13) and (3) roasting the pellets in a circulating roasting cup: when the preheating of the circulating roasting cup pellets is finished, the cooling of the reference roasting cup pellets S12 is started, the circulating hot air control valves II-III 26 are closed, the hot air control valves II-I23, the hot air mixing valve II 24, the circulating hot air control valves II-IV 25 and the hot air control valves I-II 9 are opened, the hot air control valves II-I23, the hot air mixing valve II 24, the hot air control valves I-II 9 and the waste gas control valve I10 are adjusted, so that the air temperature and the air quantity entering the circulating roasting cup 33 reach the specified values of pellet roasting, and after the specified pellet roasting time is reached, the roasting of the pellets is finished, thereby simulating the roasting stage of the belt type roasting machine adopting circulating flue gas;
(14) pellet soaking in a circulating baking cup: after the pellets in the circulating roasting cup are roasted and sintered, adjusting a hot air control valve II-I23, a hot air exchange valve II 24, a hot air control valve I-II 9 and an exhaust gas control valve I10 to ensure that the air temperature and the air quantity entering the circulating roasting cup 33 reach the specified value of pellet soaking, and finishing the pellet soaking after reaching the specified pellet soaking time so as to simulate the soaking stage of a belt type roasting machine adopting circulating flue gas;
(15) cooling the pellets in the circulating roasting cup: after the heat equalization of the pellets in the circulating roasting cup is finished, the air supply fan 1, the flow control device 2, the gas tank 3, the gas flow control device 4 and the burner 5 are closed, the hot air control valve II-I23, the hot air charging valve II 24, the circulating hot air control valve II-IV 25 and the hot air control valve II-II 27 are opened, the cooling air control valve II 39, the air supply fan II 40 and the waste gas control valve II 28 are sequentially connected with the cooling dust removal device III 29 and the air exhaust fan III 30, cold air enters a pellet material layer from the bottom of the circulating roasting cup 33 to be cooled, and after the specified pellet cooling time is reached, the cooling of the pellets is finished, so that the cooling stage of the belt type roasting machine adopting circulating flue gas is simulated.
The invention adopts two pellet roasting cup combined experimental systems, provides circulating flue gas for pellet production of the circulating roasting cup by utilizing high-temperature flue gas generated in the pellet production process of the reference roasting cup, can simulate the actual production process of the belt roasting machine more truly, can be compared with the pellet production condition without adopting the circulating flue gas, has various functions, recovers the waste heat of the flue gas, saves energy and has more practical guiding significance as a result.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. An experimental system for simulating a pelletizing belt type roasting machine is characterized in that: the device comprises an air supply fan, a flow control device, a gas tank, a gas flow control device, a burner, a split-flow combustion chamber, an upper sealing cover I, a reference baking cup supporting device, a lower sealing cover I, a cooling and dust removing device I, an air draft fan I, an air blast fan I, a cooling and dust removing device II, an air draft fan II, an upper sealing cover II, a circulating baking cup supporting device, a lower sealing cover II, a cooling and dust removing device III, an air draft fan III and an air blast fan II; the air supply fan is connected with the burner through the flow control device, the gas tank is connected with the burner through the gas flow control device, the burner is connected with the flow splitting combustion chamber, and the flow splitting combustion chamber comprises a hot air chamber I and a hot air chamber II; the hot air chamber I is sequentially connected with the upper sealing cover I through a hot air control valve I-I, a cold air charging valve I and a hot air control valve I-II through pipelines, the upper sealing cover I is sequentially connected with the cooling dust removal device I and the air draft fan I through a waste gas control valve I, the reference baking cup is rotatably arranged between the upper sealing cover I and the lower sealing cover I through a reference baking cup supporting device, the central axes of the upper sealing cover I, the reference baking cup and the lower sealing cover I are positioned on the same straight line, the lower sealing cover I is connected with the air blast fan I through a cooling air control valve I, the lower sealing cover I is connected with the pipeline between the cold air charging valve I and the hot air control valve I-II through a hot air control valve I-III, and the lower sealing cover I is sequentially connected with the cooling fan I through a flue gas control valve I and a circulating hot air control valve II-I The dust removal device II is connected with the air exhaust fan II; the hot air chamber II is sequentially connected with the upper sealing cover II through a hot air control valve II-I, a cold air mixing valve II and a hot air control valve II-II through pipelines, the upper sealing cover II is sequentially connected with a cooling and dust removing device III and an air draft fan III through a waste gas control valve II, the circulating baking cup is rotatably arranged between the upper sealing cover II and the lower sealing cover II through the circulating baking cup supporting device, the central axes of the upper sealing cover II, the circulating baking cup and the lower sealing cover II are positioned on the same straight line, the lower sealing cover II is connected with the air draft fan II through a cooling air control valve II, the lower sealing cover II is further sequentially connected with the cooling and dust removing device II and the air draft fan II through a smoke gas control valve II, the lower sealing cover II is connected with the pipeline between the smoke gas control valve I and the circulating hot air control valve II-II through a circulating hot air control valve II-II, and the lower sealing cover II is connected with a pipeline between the cold mixing valve II and the hot air control valve II through a circulating hot air control valve II-II and a circulating hot air control valve II-III.
2. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: and the pipeline between the cold air mixing valve I and the hot air control valves I-II is connected with the pipeline between the cold air mixing valve II and the hot air control valves II-II through circulating hot air control valves II-IV.
3. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: the upper sealing cover I comprises an upper sealing cover body I and an upper heat-insulating layer I, the upper heat-insulating layer I is arranged on the inner wall of the upper sealing cover body I, and an upper sealing cover thermodetector I is arranged inside the upper sealing cover I; the upper sealing cover II comprises an upper sealing cover body II and an upper heat-insulating layer II, the upper heat-insulating layer II is arranged on the inner wall of the upper sealing cover body II, and an upper sealing cover temperature measuring instrument II is arranged inside the upper sealing cover II.
4. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: go up sealing boot I with between the benchmark beaker cup and down sealing boot I with all adopt asbestos packing ring sealing connection between the benchmark beaker cup, go up sealing boot II with between the circulation beaker cup and down sealing boot II with also all adopt asbestos packing ring sealing connection between the circulation beaker cup.
5. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: the standard roasting cup is composed of a standard roasting cup body and a standard roasting cup heat-insulating lining, the circulating roasting cup is composed of a circulating roasting cup body and a circulating roasting cup heat-insulating lining, and high-temperature-resistant grate bars are arranged at the bottoms of the standard roasting cup and the circulating roasting cup.
6. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: the lower sealing cover I comprises a lower sealing cover body I and a lower heat preservation layer I, the lower heat preservation layer I is arranged on the inner wall of the lower sealing cover body I, the lower sealing cover I is internally provided with the lower sealing cover temperature measuring instrument I, the lower sealing cover II comprises a lower sealing cover body II and a lower heat preservation layer II, the lower heat preservation layer II is arranged on the inner wall of the lower sealing cover body II, and the lower sealing cover II is internally provided with the lower sealing cover temperature measuring instrument II.
7. The experimental system for simulating the pellet belt roasting machine as claimed in claim 1, wherein: the basic roasting cup is fixed on the basic roasting cup supporting device through a fastening piece, and the circulating roasting cup is also fixed on the circulating roasting cup supporting device through a fastening piece.
8. The experimental system for simulating the pellet belt roasting machine as claimed in claim 7, wherein: the reference roasting cup supporting device and the circulating roasting cup supporting device have the same structure and respectively comprise a support column and a vertical rotating support, wherein the top end of the support column is provided with a supporting seat capable of rotating on a horizontal plane, and the vertical rotating support is connected to the supporting seat in a manner of moving up and down through a bolt.
9. A method for using the experimental system for simulating the pellet belt roasting machine according to any one of claims 1 to 8, which comprises the following steps: (1) preparing combustion to enable the shunting combustion chamber to reach the specified temperature; (2) preparing a reference roasting cup raw material, and enabling central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be located on the same straight line; (3) the blast drying stage of the standard roasting cup is simulated; (4) performing air draft drying on the reference roasting cup, and simulating an air draft drying stage of the belt type roasting machine; (5) preheating the pellets in the reference roasting cup, and simulating the preheating stage of the belt type roasting machine; (6) preparing raw materials of the circulating roasting cup, and enabling the central axes of the upper sealing cover II, the circulating roasting cup and the lower sealing cover II to be located on the same straight line; (7) pre-roasting the pellets in the reference roasting cup, and simulating the roasting stage of a belt type roasting machine; (8) circulating roasting flue gas of the reference roasting cup to the bottom of the circulating roasting cup, and simulating a forced air drying stage of a belt type roasting machine adopting the circulating flue gas; (9) circulating roasting flue gas of the reference roasting cup to the top of the circulating roasting cup, and simulating an air draft drying stage of a belt type roasting machine adopting the circulating flue gas; (10) carrying out uniform heating on the pellets in the reference roasting cup, and simulating the uniform heating stage of the belt type roasting machine; (11) preheating pellets in a circulating roasting cup, circulating pellet roasting flue gas in a reference roasting cup to the top of the circulating roasting cup, and simulating a preheating stage of a belt type roasting machine adopting the circulating flue gas; (12) cooling the pellets in the reference roasting cup, and simulating the cooling stage of the belt type roasting machine; (13) roasting the pellets in the circulating roasting cup, and simulating the roasting stage of a belt type roasting machine adopting circulating flue gas; (14) circulating roasting cup pellet soaking, and simulating a soaking stage of a belt type roasting machine adopting circulating flue gas; (15) and cooling the pellets in the circulating roasting cup, and simulating the cooling stage of the belt roasting machine by adopting circulating flue gas.
10. The method for using the experimental system for simulating the pellet belt roasting machine according to claim 9, is characterized by comprising the following steps:
s1, opening a hot air control valve III, an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, and starting an igniter to enable the flow-dividing combustion chamber to reach the specified temperature;
s2, loading the green ball material into a reference roasting cup, and adjusting the reference roasting cup to enable the central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be located on the same straight line through a reference roasting cup supporting device;
s3, opening a hot air control valve I-I, a hot air mixing valve I, a hot air control valve I-III, a waste gas control valve I, a cooling dust removal device I and an exhaust fan I to provide hot air for pellet blast drying, adjusting the hot air control valve III, the hot air control valve I-I and the hot air mixing valve I to enable the air temperature and the air volume entering a reference roasting cup to reach specified values of blast drying, and finishing the blast drying after reaching specified blast drying time so as to simulate the blast drying stage of the belt type roasting machine;
s4, opening a hot air control valve I-II, a smoke control valve I, a circulating hot air control valve II-I, a cooling dust removal device II and an air draft fan II, closing the hot air control valve I-III, a waste gas control valve I, the cooling dust removal device I and the air draft fan I, and adjusting the hot air control valve III, the hot air control valve I-I and the air draft cooling valve I to enable the air temperature and the air volume entering a standard roasting cup to reach an air draft drying specified value, and after reaching specified air draft drying time, finishing air draft drying so as to simulate an air draft drying stage of a belt type roasting machine;
s5, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a specified pellet preheating value, and after the specified pellet preheating time is reached, completing pellet preheating so as to simulate the preheating stage of the belt type roasting machine;
s6, placing the green ball material into a circulating roasting cup, and adjusting the position of the circulating roasting cup through a circulating roasting cup supporting device to enable the central axes of the upper sealing cover II, the circulating roasting cup and the lower sealing cover II to be located on the same straight line;
s7, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach specified values of pellet roasting, and after specified pellet roasting time is reached, finishing the roasting of the pellets so as to simulate the roasting stage of a belt type roasting machine;
s8, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-II, a waste gas control valve II, a cooling and dedusting device III, an air draft fan III, a cooling air control valve II and a blast fan II, circulating pellet roasting flue gas of the basic roasting cup to the bottom of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach a specified value of pellet blast drying, and finishing the blast drying after reaching specified blast drying time, thereby simulating the blast drying stage of a belt type roasting machine adopting the circulating flue gas;
s9, opening a circulating hot air control valve II-III, a hot air control valve II-II, a cooling air exchanging valve II and a smoke control valve II, closing a waste gas control valve II, a cooling dust removal device III, an air draft fan III, a circulating hot air control valve II-II, a cooling air control valve II and an air blast fan II, adjusting the circulating hot air control valve II-I, the circulating hot air control valve II-III and the cooling air exchanging valve II, circulating pellet roasting smoke of the basic roasting cup to the top of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach the specified value of pellet air draft drying, and finishing air draft drying after reaching the specified air draft drying time, thereby simulating the air draft drying stage of the belt type roasting machine adopting circulating smoke;
s10, adjusting an air supply fan, a flow control device, a gas tank, a gas flow control device and a hot air control valve III to enable the temperature in the shunting combustion chamber to reach a specified temperature, adjusting the hot air control valve III, the hot air control valves I-I and a hot air mixing valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a specified pellet soaking value, and after reaching specified pellet soaking time, finishing pellet soaking so as to simulate a belt type roasting machine soaking stage;
s11, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-III and a hot air mixing valve II, circulating pellet roasting flue gas of the reference roasting cup to the top of the circulating roasting cup, enabling the air temperature and the air quantity entering the circulating roasting cup to reach a specified pellet preheating value, and after reaching specified pellet preheating time, finishing pellet preheating so as to simulate the preheating stage of the belt type roasting machine adopting the circulating flue gas;
s12, closing a hot air control valve I-I, a hot air exchange valve I and a flue gas control valve I, opening a waste gas control valve I, a cooling dust removal device I, an air draft fan I, a cooling air control valve I and an air blast fan I, cooling cold air enters a pellet material layer from the bottom of the standard roasting cup to be cooled, and after the specified pellet cooling time is reached, the pellet cooling is finished, so that the cooling stage of the belt type roasting machine is simulated;
s13, closing a circulating hot air control valve II-III, opening a hot air control valve II-I, a cold air mixing valve II, a circulating hot air control valve II-IV, adjusting a hot air control valve II-I, a cold air mixing valve II, a hot air control valve I-II and an exhaust gas control valve I, so that the air temperature and the air quantity entering a circulating roasting cup reach a specified value of roasting of the pellets, and after the specified roasting time of the pellets is reached, the roasting of the pellets is finished, thereby simulating the roasting stage of a belt type roasting machine adopting circulating flue gas;
s14, after the pellets in the circulating roasting cup are roasted and sintered, adjusting a hot air control valve II-I, a hot air exchange valve II, a hot air control valve I-II and a waste gas control valve I to enable the air temperature and the air quantity entering the circulating roasting cup to reach a specified pellet soaking value, and after reaching the specified pellet soaking time, finishing the pellet soaking so as to simulate the soaking stage of the belt type roasting machine adopting circulating flue gas;
s15, after the pellet heat equalization of the circulating roasting cup is finished, closing an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, opening a hot air control valve II-I, a heat exchange air valve II, a circulating hot air control valve II-IV and a hot air control valve II-II, opening a cooling air control valve II, a blast fan II and a waste gas control valve II, sequentially connecting a cooling dust removal device III and an air draft fan III, allowing cold air to enter a pellet material layer from the bottom of the circulating roasting cup for cooling, and after the specified pellet cooling time is reached, finishing the cooling of the pellets, thereby simulating the cooling stage of the belt type roasting machine adopting circulating flue gas.
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| CN113652542A (en) * | 2021-08-16 | 2021-11-16 | 中冶长天国际工程有限责任公司 | Physical simulation test system and test method for roasting of oxidized pellets |
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