CN112375902B - Experimental system for simulating pellet belt roasting machine and application method thereof - Google Patents
Experimental system for simulating pellet belt roasting machine and application method thereof Download PDFInfo
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- CN112375902B CN112375902B CN202110019156.4A CN202110019156A CN112375902B CN 112375902 B CN112375902 B CN 112375902B CN 202110019156 A CN202110019156 A CN 202110019156A CN 112375902 B CN112375902 B CN 112375902B
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- 239000008188 pellet Substances 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 155
- 238000001816 cooling Methods 0.000 claims abstract description 101
- 239000007789 gas Substances 0.000 claims abstract description 58
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003546 flue gas Substances 0.000 claims abstract description 51
- 239000000428 dust Substances 0.000 claims abstract description 44
- 238000002485 combustion reaction Methods 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims description 57
- 238000002791 soaking Methods 0.000 claims description 38
- 239000000779 smoke Substances 0.000 claims description 26
- 238000004321 preservation Methods 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 22
- 238000007605 air drying Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 239000002912 waste gas Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 239000010425 asbestos Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 5
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000006243 chemical reaction 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
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution 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
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- 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 pellet belt roasting machine and a use method thereof, wherein the experimental system comprises: 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 beaker supporting device, a lower sealing cover I, a cooling dust removing device I, an air draft fan I, an air blower fan I, a cooling dust removing device II, an air draft fan II, an upper sealing cover II, a circulating baking beaker supporting device, a lower sealing cover II, a cooling dust removing device III, an air draft fan II and an air blower fan II. The invention provides the circulating flue gas for the pellet production of the circulating baking cup by utilizing the high-temperature flue gas generated by the standard baking 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 and high energy utilization rate, and has more practical guiding significance on experimental results.
Description
Technical Field
The invention relates to the technical field of experimental equipment for producing iron ore pellets, in particular to an experimental system for simulating a pellet belt roasting machine and a use method thereof.
Background
The iron ore pellet has the advantages of uniform granularity, high strength, suitability for long-distance transportation and storage, high iron grade, good metallurgical property, contribution to improving the air permeability of a material column during smelting, reducing the coke ratio and the like, and is an ideal furnace charge of a modern blast furnace.
The production process of the world iron ore pellets mainly comprises a shaft furnace process, a grate-rotary kiln process and a belt conveyor process. The high-ratio hematite pellets or solvent pellets cannot be produced by the shaft furnace process or the grate-rotary kiln process due to the continuous falling or reversing movement of the pellets in the processing process.
The process design of the belt type pellet integrates the procedures of drying, preheating, roasting and cooling on a belt type machine, so that the green pellets do not need to fall down or be inverted in the process from the end of spreading to the generation of finished pellets, and the pellet quality of the belt type pellet process is ensured; the belt conveyor adopts nozzles on two sides of the trolley to spray fuel for heat supply, and the preheating and roasting temperatures are easy to control.
The experimental device for simulating the pellet belt roasting machine mainly comprises a small-sized bedroom tube furnace and an experimental pellet belt roasting machine. The small 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 roasting machine. Most of the existing experimental pellet belt roasting machines directly adopt a combustion chamber air distribution mode to simulate the pellet production process, and the actual production process of the pellet of the existing belt roasting machine needs to carry out smoke circulation. Therefore, the existing laboratory pellet belt roasting machine cannot well simulate the actual reaction process of the pellet of the belt roasting machine adopting circulating smoke.
Disclosure of Invention
The invention aims to provide an experimental system for simulating a pellet belt roasting machine and a use method thereof, so as to overcome the defect that the conventional laboratory pellet belt roasting machine cannot well simulate the actual reaction process of pellets of the belt roasting machine by adopting circulating smoke.
The invention adopts the following technical scheme:
An experimental system for simulating a pellet belt 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 dust removing device I, an air draft fan I, an air blower fan I, a cooling 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 dust removing device III, an air draft fan III and an air blower 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 split-flow combustion chamber, and the split-flow combustion chamber comprises a hot air chamber I and a hot air chamber II; the hot air chamber I is connected with the upper sealing cover I through a hot air control valve I-I, a cold air exchanging valve I and a hot air control valve I-II in sequence by a pipeline, the upper sealing cover I is connected with the cooling dust removing device I and the air draft fan I through an exhaust gas control valve I in sequence, 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 draft fan I through a cooling air control valve I, the lower sealing cover I is connected with the pipeline between the cold air exchanging 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 connected with the cooling dust removing device II and the air draft fan II through a flue gas control valve I and a circulating hot air control valve II-I in sequence; the hot air chamber II is connected with the upper sealing cover II through a hot air control valve II-I, a cold air exchanging valve II and a hot air control valve II-II in sequence, the upper sealing cover II is connected with a cooling dust removing device III and an air draft fan III through an exhaust gas control valve II in sequence, the circulating baking cup is rotatably arranged between the upper sealing cover II and the lower sealing cover II through a 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 also connected with the cooling dust removing device II and the air draft fan II through a flue gas control valve II in sequence, the lower sealing cover II is connected with a pipeline between the flue gas control valve I and the circulating hot air control valve II-I through the circulating hot air control valve II-II, and the lower sealing cover II is connected with the cold air exchanging valve II and the pipeline between the circulating hot air control valve II-III and the cooling air control valve II.
Preferably, a pipeline between the cold air exchanging valve I and the hot air control valve I-II is connected with a pipeline between the cold air exchanging valve II and the hot air control valve II-II through a circulating hot air control valve II-IV.
Further, the upper sealing cover I comprises an upper sealing cover body I and an upper heat preservation layer I, wherein the upper heat preservation layer I is arranged on the inner wall of the upper sealing cover body I, and an upper sealing cover thermometer I is arranged in the upper sealing cover I; the upper sealing cover II comprises an upper sealing cover body II and an upper heat preservation layer II, wherein the upper heat preservation layer II is arranged on the inner wall of the upper sealing cover body II, and an upper sealing cover thermometer II is arranged in the upper sealing cover II.
Further, the upper sealing cover I is in sealing connection with the reference beaker, the lower sealing cover I is in sealing connection with the reference beaker through an asbestos gasket, and the upper sealing cover II is in sealing connection with the circulating beaker, and the lower sealing cover II is in sealing connection with the circulating beaker through an asbestos gasket.
Further, the reference beaker is composed of a reference roasting cup body and a reference roasting cup heat insulation lining, the circulating roasting cup is composed of a circulating roasting cup body and a circulating roasting cup heat insulation lining, and high-temperature-resistant grate bars are arranged at the bottoms of the reference roasting cup and the circulating roasting cup.
Further, lower sealed cowling I includes lower sealed cowling body I and lower heat preservation I, lower heat preservation I sets up on the lower sealed cowling body I inner wall, the inside lower sealed cowling I is provided with lower sealed cowling thermoscope I, lower sealed cowling II includes lower sealed cowling body II and lower heat preservation II, lower heat preservation II sets up on the lower sealed cowling body II inner wall, the inside lower sealed cowling II is provided with lower sealed cowling thermoscope II.
The reference roasting cup is fixed on the reference 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 standard beaker supporting device and the circulating beaker supporting device have the same structure and 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 an up-and-down movable manner through bolts.
The application method of the experimental system for simulating the pellet belt roasting machine comprises the following steps of: (1) Preparing for combustion, namely enabling the split-flow combustion chamber to reach a specified temperature; (2) Preparing the raw materials of the reference roasting cup, and enabling the central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be positioned on the same straight line; (3) The standard roasting cup is subjected to forced air drying, and the forced air drying stage of the belt type roasting machine 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 reference roasting cup pellets, and simulating a preheating stage of the belt roasting machine; (6) Preparing raw materials of the circulating baking cup, and enabling the central axes of the upper sealing cover II, the circulating baking cup and the lower sealing cover II to be positioned on the same straight line; (7) Pre-roasting the standard roasting cup pellets, and simulating a roasting stage of a belt roasting machine; (8) The circular roasting cup is subjected to forced air drying, pellet roasting smoke of the reference roasting cup is circulated to the bottom of the circular roasting cup, and the forced air drying stage of a belt roasting machine adopting the circular smoke is simulated; (9) Exhausting and drying the circular roasting cup, namely circulating pellet roasting flue gas of the reference roasting cup to the top of the circular roasting cup, and simulating an exhausting and drying stage of a belt roasting machine adopting the circular flue gas; (10) Soaking the reference roasting cup pellets, and simulating a soaking stage of a belt type roasting machine; (11) The pellet preheating of the circulating roasting cup, namely circulating the pellet roasting flue gas of the standard roasting cup to the top of the circulating roasting cup, and simulating the preheating stage of the belt roasting machine adopting the circulating flue gas; (12) Cooling the reference roasting cup pellets, and simulating a cooling stage of the belt roasting machine; (13) Roasting the pellet in the circulating roasting cup, and simulating a roasting stage of a belt roasting machine adopting circulating smoke; (14) Soaking the circular roasting cup pellets, and simulating a soaking stage of a belt roasting machine adopting circular smoke; (15) And cooling the pellet in the circulating roasting cup, and simulating a cooling stage of the belt roasting machine adopting circulating smoke.
The using method of the experimental system for simulating the pellet belt 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 split-flow combustion chamber to reach a specified temperature;
s2, loading raw ball materials into a reference roasting cup, and adjusting the reference roasting cup to enable the central axes of an upper sealing cover I, the reference roasting cup and a lower sealing cover I to be positioned on the same straight line through a reference roasting cup supporting device;
s3, opening a hot air control valve I-I, a cold air exchanging valve I, a hot air control valve I-III, an exhaust gas control valve I, a cooling dust collector I and an exhaust fan I to supply hot air for pellet forced air drying, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air exchanging valve I to enable the air temperature and the air quantity entering a reference beaker to reach forced air drying appointed values, and after the appointed forced air drying time is reached, ending forced air drying, thereby simulating the forced air drying stage of the belt type roasting machine;
S4, opening a hot air control valve I-II, a flue gas control valve I, a circulating hot air control valve II-I, a cooling dust removing device II and an exhaust fan II, closing the hot air control valve I-III, the waste gas control valve I, the cooling dust removing device I and the exhaust fan I, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering a reference baking cup to reach an exhaust drying appointed value, and after the appointed exhaust drying time is reached, ending the exhaust drying, thereby simulating an exhaust 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 split combustion chamber to reach a specified temperature, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering the reference baking cup to reach a pellet preheating specified value, and after the specified pellet preheating time is reached, finishing pellet preheating so as to simulate a preheating stage of the belt type baking machine;
S6, loading raw ball materials into a circulating baking cup, and adjusting the position of the circulating baking cup to enable the central axes of an upper sealing cover II, the circulating baking cup and a lower sealing cover II to be positioned on the same straight line through a circulating baking cup supporting device;
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 split combustion chamber to reach a specified value, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a pellet roasting specified value, and after the specified pellet roasting time is reached, finishing pellet roasting, so that a roasting stage of the belt type roasting machine is simulated;
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 dust removal device III, an exhaust fan III, a cooling air control valve II and a blowing fan II, and circulating pellet roasting flue gas of a reference roasting cup to the bottom of the circulating roasting cup to enable the air temperature and the air quantity entering the circulating roasting cup to reach a pellet blowing drying appointed value, and after the appointed blowing drying time is reached, ending the blowing drying, thereby simulating a blowing drying stage of a belt 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 cold air adding valve II and a flue gas control valve II, closing the waste gas control valve II, a cooling dust removing device III, an exhaust fan III, a circulating hot air control valve II-II, a cooling air control valve II and a blowing fan II, regulating the circulating hot air control valve II-I, the circulating hot air control valve II-III and the cold air adding valve II, circulating pellet roasting flue gas of a 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 pellet exhaust drying appointed values, and ending exhaust drying after the appointed exhaust drying time is reached, thereby simulating an exhaust drying stage of a belt roasting machine adopting the circulating flue gas;
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 split combustion chamber to reach a specified temperature, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air blending valve I to enable the air temperature and the air quantity entering a reference baking cup to reach a pellet soaking specified value, and after the specified pellet soaking time is reached, finishing pellet soaking so as to simulate a soaking stage of a belt type roasting machine;
S11, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-III and a cold air adding valve II, and circulating pellet roasting flue gas of a reference roasting cup to the top of the circulating roasting cup, so that the air temperature and the air quantity entering the circulating roasting cup reach a pellet preheating specified value, and after the specified pellet preheating time is reached, finishing pellet preheating, thereby simulating a preheating stage of a belt roasting machine adopting the circulating flue gas;
S12, closing a hot air control valve I-I, a cold air exchange valve I and a smoke control valve I, opening the exhaust air control valve I, the cooling dust removing device I, the exhaust fan I, the cooling air control valve I and the blowing fan I, and cooling cold air from the bottom of the reference baking beaker into a pellet material layer to cool, wherein after the specified pellet cooling time is reached, the pellet cooling is finished, so that the cooling stage of the belt type baking machine is simulated;
S13, closing a circulating hot air control valve II-III, opening a hot air control valve II-I, a cold air adding valve II and a circulating hot air control valve II-IV, regulating the hot air control valve II-I, the cold air adding valve II, the hot air control valve I-II and an exhaust gas control valve I to ensure that the air temperature and the air quantity entering a circulating baking cup reach a pellet baking appointed value, and finishing pellet baking after the appointed pellet baking time is reached, so as to simulate a belt type roasting machine baking stage adopting circulating flue gas;
S14, after the pellet roasting of the circulating roasting cup is finished, regulating a hot air control valve II-I, a cold air adding 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 pellet soaking appointed value, and after the appointed pellet soaking time is reached, finishing the pellet soaking, thereby simulating a soaking stage of a belt type roasting machine adopting circulating smoke;
S15, after soaking of the pellets in the circulating baking cup is finished, closing an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, namely a hot air control valve II-I, a cold air exchange 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, an air supply fan II and an exhaust gas control valve II, and sequentially cooling the pellets with a cooling dust removing device III and an exhaust fan III, cooling cold air from the bottom of the circulating baking cup, and after the specified pellet cooling time is reached, finishing pellet cooling, thereby simulating the cooling stage of the belt type roasting machine adopting circulating smoke.
From the above description of the invention, it is clear that the invention has the following advantages over the prior art:
the two pellet roasting cup combined experimental systems are adopted, the high-temperature flue gas generated in the standard roasting cup pellet production process is utilized to provide the circulating flue gas for the pellet production of the circulating roasting cup, the actual production process of the belt 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 functions are various, the flue gas waste heat is recovered, the energy is saved, and the result has more practical guiding significance.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent to one skilled in the art that the present invention may be practiced without these details. Well-known components, methods and procedures are not described in detail.
Referring to fig. 1, an experimental system for simulating a pellet belt 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-flow combustion chamber 6, an upper sealing cover i 14, a reference roasting cup 16, a reference roasting cup supporting device 19, a lower sealing cover i 18, a cooling dust removing device i 11, an air suction fan i 12, an air blower fan i 22, a cooling dust removing device ii 42, an air suction 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 dust removing device iii 29, an air suction fan iii 30 and an air blower 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 split-flow combustion chamber 6, and the split-flow combustion chamber 6 comprises a hot air chamber I61 and a hot air chamber II 62.
The hot air chamber I61 is connected with the upper sealing cover I14 through a pipeline sequentially through a hot air control valve I-I7, a cold air exchanging valve I8 and a hot air control valve I-II 9, the upper sealing cover I14 is sequentially connected with the cooling dust removing device I11 and the air draft fan I12 through an exhaust gas control valve I10, the lower sealing cover I18 is connected with the air draft fan I22 through a cooling air control valve I21, the lower sealing cover I18 is connected with the pipeline between the cold air exchanging valve I8 and the hot air control valve I-II 9 through a hot air control valve I-III 13, and the lower sealing cover I18 is sequentially connected with the cooling 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 connected with the upper sealing cover II 31 through a hot air control valve II-I23, a cold air exchanging valve II 24 and a hot air control valve II-II 27 in sequence, the upper sealing cover II 31 is connected with a cooling dust removing device III 29 and an air draft fan III 30 through an exhaust gas control valve II 28 in sequence, the lower sealing cover II 35 is connected with an air draft fan II 40 through a cooling air control valve II 39, the lower sealing cover II 35 is connected with a cooling dust removing device II 42 and an air draft fan II 43 through a flue gas control valve II 38 in sequence, the lower sealing cover II 35 is connected with a pipeline between the flue gas control valve I20 and the circulating hot air control valve II-I41 through a circulating hot air control valve II-II 37 and a circulating hot air control valve II-III 26, and a pipeline between the cold air exchanging valve II 24 and the hot air control valve II-II 27.
The pipeline between the cold air exchanging valve I8 and the hot air control valves I-II 9 is connected with the pipeline between the cold air exchanging valve II 24 and the hot air control valves II-II 27 through the circulating hot air control valves II-IV 25.
The central axes of the upper sealing cover I14, the reference baking cup 16 and the lower sealing cover I18 are positioned on the same straight line, and the upper sealing cover I14 is in sealing connection with the reference baking cup 16, and the lower sealing cover I18 is in sealing connection with the reference baking cup 16 through asbestos gaskets. The central axes of the upper sealing cover II 31, the circulating baking cup 33 and the lower sealing cover II 35 are positioned on the same straight line, and asbestos gaskets are also used for sealing connection between the upper sealing cover II 31 and the circulating baking cup 33 and between the lower sealing cover II 35 and the circulating baking 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 thermometer 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 thermometer 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 thermal insulation lining, the circulating roasting cup 33 is composed of a circulating roasting cup body and a circulating roasting cup thermal insulation lining, and high-temperature resistant grate bars are arranged at the bottoms of the reference roasting cup 16 and the circulating roasting cup 33.
The lower sealed cowling I18 includes lower sealed cowling body I and lower heat preservation I, lower heat preservation I sets up on the I inner wall of lower sealed cowling body, the inside lower sealed cowling I18 is provided with lower sealed cowling thermoscope I17. The lower sealing cover II 35 comprises a lower sealing cover body II and a lower heat preservation layer II, wherein 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 35 is internally provided with a lower sealing cover thermodetector II 34.
The reference beaker 16 is fixed to the reference beaker support means 19 by means of fasteners, and the circulating beaker 33 is fixed to the circulating beaker support means 36 by means of fasteners. The reference roasting cup supporting device 19 and the circulating roasting cup supporting device 36 have the same structure and comprise a supporting column 191 and a vertical rotating bracket 192, wherein a supporting seat 193 capable of rotating on a horizontal plane is arranged at the top end of the supporting column 191, and the vertical rotating bracket 192 is connected to the supporting seat 193 in a vertically movable manner through bolts.
The application method of the experimental system for simulating the pellet belt roasting machine comprises the following steps of:
(1) Preparation of a combustion chamber: opening a hot air control valve III 44, and starting an igniter to enable the split-flow combustion chamber 6 to reach a specified temperature by the air supply fan 1, the flow control device 2, the gas tank 3, the gas flow control device 4 and the burner 5;
(2) Preparing raw materials of a reference roasting cup: loading the green ball materials into a reference baking cup 16, and adjusting the position of the reference baking cup 16 to be positioned on the same straight line with the central axes of an upper sealing cover I14, the reference baking cup 16 and a lower sealing cover I18 through a reference baking cup supporting device 19;
(3) Air drying in a reference beaker: the hot air control valve I-I7, the cold air exchanging valve I8, the hot air control valve I-III 13, the waste gas control valve I10, the cooling dust removing device I11 and the exhaust fan I12 are opened to supply hot air for pellet blast drying, and the blast temperature and the air quantity entering the reference baking cup 16 reach a specified value of blast drying through adjusting the hot air control valve III 44, the hot air control valve I-I7 and the cold air exchanging valve I8, and after the specified blast drying time is reached, the blast drying is finished, so that the blast drying stage of the belt type baking machine is simulated;
(4) And (5) air-draft drying in a reference baking beaker: after the standard beaker blast drying is finished, a hot air control valve I-II 9, a flue gas control valve I20, a circulating hot air control valve II-I41, a cooling dust removing device II 42 and an exhaust fan II 43 are opened, the hot air control valve I-III 13, the waste gas control valve I10, the cooling dust removing device I11 and the exhaust fan I12 are closed, and a hot air control valve III 44, a hot air control valve I-I7 and a cold air adding valve I8 are regulated to enable the air temperature and the air quantity entering the standard beaker 16 to reach the specified value of the exhaust drying, and after the specified exhaust drying time is reached, the exhaust drying is finished, so that the exhaust drying stage of the belt type roasting machine is simulated;
(5) Preheating the basic baking cup pellets: after the reference beaker is subjected to air draft drying, 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 are regulated to enable the inside of the split combustion chamber 6 to reach a specified temperature, and the hot air control valve III 44, a hot air control valve I-I7 and a cold air adding valve I8 are regulated to enable the air temperature and the air quantity entering the reference beaker 16 to reach pellet preheating specified values, 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 raw materials of a reference roasting cup: after the standard beaker pellets are preheated, loading raw ball materials into a circulating baking cup 33, and adjusting the position of the circulating baking cup 33 to be on the same straight line with the central axes of an upper sealing cover II 31, the circulating baking cup 33 and a lower sealing cover II 35 through a circulating baking cup supporting device 36;
(7) Roasting the standard roasting cup pellets: after the standard beaker pellets are preheated, 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 are regulated to enable the inside of the split combustion chamber 6 to reach a specified temperature, and the hot air control valve III 44, a hot air control valve I-I7 and a cold air adding valve I8 are regulated to enable the air temperature and the air quantity entering the standard beaker 16 to reach pellet roasting specified values, and after the specified pellet roasting time is reached, the pellet roasting is ended, so that the roasting stage of the belt roasting machine is simulated;
(8) And (5) circularly baking the materials in a beaker for blast drying: when the pellet roasting of the reference roasting cup starts, a circulating hot air control valve II-I41, a circulating hot air control valve II-II 37, an exhaust gas control valve II 28, a cooling dust removing device III 29, an exhaust fan III 30, a cooling air control valve II 39 and a blowing fan II 40 are regulated, pellet roasting flue gas of the reference roasting cup 16 is circulated to the bottom of the circulating roasting cup 33, so that the air temperature and the air quantity entering the circulating roasting cup 33 reach a specified value of pellet blowing and drying, and after a specified blowing and drying time is reached, the blowing and drying is finished, thereby simulating a blowing and drying stage of a belt roasting machine adopting the circulating flue gas;
(9) And (5) circulating baking cup air draft drying: after the blowing and drying of the circulating baking cup are finished, a circulating hot air control valve II-III 26, a hot air control valve II-II 27, a cold air adding valve II 24 and a smoke control valve II 38 are opened, a waste air control valve II 28, a cooling dust removing device III 29, an exhaust fan III 30, a circulating hot air control valve II-II 37, a cooling air control valve II 39 and a blowing fan II 40 are closed, a circulating hot air control valve II-I41, a circulating hot air control valve II-III 26 and a cold air adding valve II 24 are regulated, pellet baking smoke of the reference baking cup 16 is circulated to the top of the circulating baking cup 33, so that the air temperature and the air quantity entering the circulating baking cup 33 reach pellet exhaust drying specified values, and exhaust drying is finished after the specified exhaust drying time is reached, so that an exhaust drying stage of a belt type baking machine adopting the circulating smoke is simulated;
(10) Soaking the standard baking cup pellets: after the standard beaker pellets are baked, 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 are regulated to enable the inside of the split combustion chamber 6 to reach a specified temperature, and the hot air control valve III 44, a hot air control valve I-I7 and a cold air blending valve I8 are regulated to enable the air temperature and the air quantity entering the standard beaker 16 to reach pellet soaking specified values, and after the specified pellet soaking time is reached, the pellet soaking is ended, so that a soaking stage of the belt type roasting machine is simulated;
(11) Preheating the cyclic baking cup pellets: after the circulation baking cup is subjected to air draft drying, a circulation hot air control valve II-I41, a circulation hot air control valve II-III 26 and a cold air adding valve II 24 are regulated, and pellet baking flue gas of the reference baking cup 16 is circulated to the top of the circulation baking cup 33, so that the air temperature and the air quantity entering the circulation baking cup 33 reach a pellet preheating specified value, and after the specified pellet preheating time is reached, the pellet preheating is finished, and the preheating stage of a belt type roasting machine adopting the circulation flue gas is simulated;
(12) And (5) cooling the base beaker pellets: after the soaking of the pellets in the standard baking beaker is finished, closing a hot air control valve I-I7, a cold air exchange valve I8 and a flue gas control valve I20, opening a waste gas control valve I10, a cooling dust removing device I11, an exhaust fan I12, a cooling air control valve I21 and a blowing fan I22, cooling cold air from the bottom of the standard baking beaker 16 into a pellet material layer, 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;
(13) And (3) roasting the circularly baked beaker pellets: when the preheating of the pellet in the circulating baking cup is finished, the cooling S12 of the pellet in the standard baking cup is started, the circulating hot air control valve II-III 26 is closed, the hot air control valve II-I23, the cold air adding valve II 24, the circulating hot air control valve II-IV 25 and the hot air control valve I-II 9 are opened, the hot air control valve II-I23, the cold air adding valve II 24, the hot air control valve I-II 9 and the waste gas control valve I10 are regulated, so that the air temperature and the air quantity entering the circulating baking cup 33 reach the pellet baking appointed value, and after the appointed pellet baking time is reached, the pellet baking is finished, and the baking stage of the belt type roasting machine adopting the circulating flue gas is simulated;
(14) Soaking the circularly baked beaker pellets: after the pellet roasting of the circulating roasting cup is finished, regulating a hot air control valve II-I23, a cold air adding valve II 24, a hot air control valve I-II 9 and a waste gas control valve I10 to ensure that the air temperature and the air quantity entering the circulating roasting cup 33 reach a pellet soaking appointed value, and after the appointed pellet soaking time is reached, finishing the pellet soaking, thereby simulating a soaking stage of a belt type roasting machine adopting circulating smoke;
(15) And (5) cooling the circular baking cup pellets: after the soaking of the circular baking cup pellets is finished, an air supply fan 1, a flow control device 2, a gas tank 3, a gas flow control device 4 and a burner 5 are closed, a hot air control valve II-I23, a cold air adding valve II 24, a circular hot air control valve II-IV 25 and a hot air control valve II-II 27 are opened, a cooling air control valve II 39, an air supply fan II 40 and an exhaust gas control valve II 28 are sequentially connected with a cooling dust removing device III 29 and an exhaust fan III 30, cold air enters the pellet material layer from the bottom of the circular baking cup 33 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 adopting circular smoke is simulated.
The invention adopts two pellet roasting cup combined experimental systems, and utilizes high-temperature flue gas generated in the pellet production process of the standard roasting cup to provide circulating flue gas for pellet production of the circulating roasting cup, so that the actual production process of the belt roasting machine can be more truly simulated, and meanwhile, compared with the pellet production condition without adopting the circulating flue gas, the system has various functions, can recover flue gas waste heat, saves energy sources, and has more practical guiding significance in results.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (8)
1. An experimental system for simulating a pellet belt 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 beaker supporting device, a lower sealing cover I, a cooling dust removing device I, an air draft fan I, an air blower fan I, a cooling dust removing device II, an air draft fan II, an upper sealing cover II, a circulating baking beaker supporting device, a lower sealing cover II, a cooling dust removing device III, an air draft fan III and an air blower 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 split-flow combustion chamber, and the split-flow combustion chamber comprises a hot air chamber I and a hot air chamber II; the hot air chamber I is connected with the upper sealing cover I through a hot air control valve I-I, a cold air exchanging valve I and a hot air control valve I-II in sequence by a pipeline, the upper sealing cover I is connected with the cooling dust removing device I and the air draft fan I through an exhaust gas control valve I in sequence, 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 draft fan I through a cooling air control valve I, the lower sealing cover I is connected with the pipeline between the cold air exchanging valve I and the hot air control valve I-II through a hot air control valve I-III, the lower sealing cover I is sequentially connected with a cooling and dedusting device II and an exhaust fan II through a smoke control valve I and a circulating hot air control valve II-I; the hot air chamber II is connected with the upper sealing cover II through a pipeline sequentially through a hot air control valve II-I, a cold air exchanging valve II and a hot air control valve II-II, the upper sealing cover II is sequentially connected with a cooling dust removing device III and an air draft fan III through an exhaust gas control valve II, the circulating baking cup is rotatably arranged between the upper sealing cover II and the lower sealing cover II through a 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, and the lower sealing cover II is sequentially connected with the cooling dust removing device II through a flue gas control valve II, The lower sealing cover II is connected with a pipeline between the smoke control valve I and the circulating hot air control valve II-I through the circulating hot air control valve II-II and the pipeline between the cold air exchanging valve II and the hot air control valve II-II through the circulating hot air control valve II-II and the circulating hot air control valve II-III; the pipeline between the cold air exchanging valve I and the hot air control valve I-II is connected with the pipeline between the cold air exchanging valve II and the hot air control valve II-II through the circulating hot air control valve II-IV; the upper sealing cover I comprises an upper sealing cover body I and an upper heat preservation layer I, wherein the upper heat preservation layer I is arranged on the inner wall of the upper sealing cover body I, and an upper sealing cover thermometer I is arranged in the upper sealing cover I; the upper sealing cover II comprises an upper sealing cover body II and an upper heat preservation layer II, wherein the upper heat preservation layer II is arranged on the inner wall of the upper sealing cover body II, and an upper sealing cover thermometer II is arranged in the upper sealing cover II.
2. An experimental system for simulating a pellet firing press as claimed in claim 1, wherein: the upper sealing cover I is in sealing connection with the reference beaker, the lower sealing cover I is in sealing connection with the reference beaker through an asbestos gasket, and the upper sealing cover II is in sealing connection with the circulating beaker, and the lower sealing cover II is in sealing connection with the circulating beaker through an asbestos gasket.
3. An experimental system for simulating a pellet firing press as claimed in claim 1, wherein: the reference beaker comprises a reference roasting cup body and a reference roasting cup heat insulation lining, the circulating roasting cup comprises a circulating roasting cup body and a circulating roasting cup heat insulation lining, and high-temperature-resistant grate bars are arranged at the bottoms of the reference roasting cup and the circulating roasting cup.
4. An experimental system for simulating a pellet firing press 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 a lower sealing cover thermometer 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 a lower sealing cover thermometer II.
5. An experimental system for simulating a pellet firing press as claimed in claim 1, wherein: the reference roasting cup is fixed on the reference 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.
6. An experimental system for simulating a pellet firing press as claimed in claim 5, wherein: the standard beaker supporting device and the circulating beaker supporting device have the same structure and 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 an up-and-down movable manner through bolts.
7. A method of using the experimental system of a simulated pellet grate machine of any of claims 1-6, comprising the steps of: (1) Preparing for combustion, namely enabling the split-flow combustion chamber to reach a specified temperature; (2) Preparing the raw materials of the reference roasting cup, and enabling the central axes of the upper sealing cover I, the reference roasting cup and the lower sealing cover I to be positioned on the same straight line; (3) The standard roasting cup is subjected to forced air drying, and the forced air drying stage of the belt type roasting machine 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 reference roasting cup pellets, and simulating a preheating stage of the belt roasting machine; (6) Preparing raw materials of the circulating baking cup, and enabling the central axes of the upper sealing cover II, the circulating baking cup and the lower sealing cover II to be positioned on the same straight line; (7) Pre-roasting the standard roasting cup pellets, and simulating a roasting stage of a belt roasting machine; (8) The circular roasting cup is subjected to forced air drying, pellet roasting smoke of the reference roasting cup is circulated to the bottom of the circular roasting cup, and the forced air drying stage of a belt roasting machine adopting the circular smoke is simulated; (9) Exhausting and drying the circular roasting cup, namely circulating pellet roasting flue gas of the reference roasting cup to the top of the circular roasting cup, and simulating an exhausting and drying stage of a belt roasting machine adopting the circular flue gas; (10) Soaking the reference roasting cup pellets, and simulating a soaking stage of a belt type roasting machine; (11) The pellet preheating of the circulating roasting cup, namely circulating the pellet roasting flue gas of the standard roasting cup to the top of the circulating roasting cup, and simulating the preheating stage of the belt roasting machine adopting the circulating flue gas; (12) Cooling the reference roasting cup pellets, and simulating a cooling stage of the belt roasting machine; (13) Roasting the pellet in the circulating roasting cup, and simulating a roasting stage of a belt roasting machine adopting circulating smoke; (14) Soaking the circular roasting cup pellets, and simulating a soaking stage of a belt roasting machine adopting circular smoke; (15) And cooling the pellet in the circulating roasting cup, and simulating a cooling stage of the belt roasting machine adopting circulating smoke.
8. The method for using the experimental system for simulating a pellet belt roasting machine according to claim 7, wherein the specific process is as follows:
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 split-flow combustion chamber to reach a specified temperature;
s2, loading raw ball materials into a reference roasting cup, and adjusting the reference roasting cup to enable the central axes of an upper sealing cover I, the reference roasting cup and a lower sealing cover I to be positioned on the same straight line through a reference roasting cup supporting device;
s3, opening a hot air control valve I-I, a cold air exchanging valve I, a hot air control valve I-III, an exhaust gas control valve I, a cooling dust collector I and an exhaust fan I to supply hot air for pellet forced air drying, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air exchanging valve I to enable the air temperature and the air quantity entering a reference beaker to reach forced air drying appointed values, and after the appointed forced air drying time is reached, ending forced air drying, thereby simulating the forced air drying stage of the belt type roasting machine;
S4, opening a hot air control valve I-II, a flue gas control valve I, a circulating hot air control valve II-I, a cooling dust removing device II and an exhaust fan II, closing the hot air control valve I-III, the waste gas control valve I, the cooling dust removing device I and the exhaust fan I, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering a reference baking cup to reach an exhaust drying appointed value, and after the appointed exhaust drying time is reached, ending the exhaust drying, thereby simulating an exhaust 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 split combustion chamber to reach a specified temperature, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering the reference baking cup to reach a pellet preheating specified value, and after the specified pellet preheating time is reached, finishing pellet preheating so as to simulate a preheating stage of the belt type baking machine;
S6, loading raw ball materials into a circulating baking cup, and adjusting the position of the circulating baking cup to enable the central axes of an upper sealing cover II, the circulating baking cup and a lower sealing cover II to be positioned on the same straight line through a circulating baking cup supporting device;
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 split combustion chamber to reach a specified value, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air adding valve I to enable the air temperature and the air quantity entering the reference roasting cup to reach a pellet roasting specified value, and after the specified pellet roasting time is reached, finishing pellet roasting, so that a roasting stage of the belt type roasting machine is simulated;
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 dust removal device III, an exhaust fan III, a cooling air control valve II and a blowing fan II, and circulating pellet roasting flue gas of a reference roasting cup to the bottom of the circulating roasting cup to enable the air temperature and the air quantity entering the circulating roasting cup to reach a pellet blowing drying appointed value, and after the appointed blowing drying time is reached, ending the blowing drying, thereby simulating a blowing drying stage of a belt 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 cold air adding valve II and a flue gas control valve II, closing the waste gas control valve II, a cooling dust removing device III, an exhaust fan III, a circulating hot air control valve II-II, a cooling air control valve II and a blowing fan II, regulating the circulating hot air control valve II-I, the circulating hot air control valve II-III and the cold air adding valve II, circulating pellet roasting flue gas of a 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 pellet exhaust drying appointed values, and ending exhaust drying after the appointed exhaust drying time is reached, thereby simulating an exhaust drying stage of a belt roasting machine adopting the circulating flue gas;
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 split combustion chamber to reach a specified temperature, and adjusting the hot air control valve III, the hot air control valve I-I and the cold air blending valve I to enable the air temperature and the air quantity entering a reference baking cup to reach a pellet soaking specified value, and after the specified pellet soaking time is reached, finishing pellet soaking so as to simulate a soaking stage of a belt type roasting machine;
S11, adjusting a circulating hot air control valve II-I, a circulating hot air control valve II-III and a cold air adding valve II, and circulating pellet roasting flue gas of a reference roasting cup to the top of the circulating roasting cup, so that the air temperature and the air quantity entering the circulating roasting cup reach a pellet preheating specified value, and after the specified pellet preheating time is reached, finishing pellet preheating, thereby simulating a preheating stage of a belt roasting machine adopting the circulating flue gas;
S12, closing a hot air control valve I-I, a cold air exchange valve I and a smoke control valve I, opening the exhaust air control valve I, the cooling dust removing device I, the exhaust fan I, the cooling air control valve I and the blowing fan I, and cooling cold air from the bottom of the reference baking beaker into a pellet material layer to cool, wherein after the specified pellet cooling time is reached, the pellet cooling is finished, so that the cooling stage of the belt type baking machine is simulated;
S13, closing a circulating hot air control valve II-III, opening a hot air control valve II-I, a cold air adding valve II and a circulating hot air control valve II-IV, regulating the hot air control valve II-I, the cold air adding valve II, the hot air control valve I-II and an exhaust gas control valve I to ensure that the air temperature and the air quantity entering a circulating baking cup reach a pellet baking appointed value, and finishing pellet baking after the appointed pellet baking time is reached, so as to simulate a belt type roasting machine baking stage adopting circulating flue gas;
S14, after the pellet roasting of the circulating roasting cup is finished, regulating a hot air control valve II-I, a cold air adding 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 pellet soaking appointed value, and after the appointed pellet soaking time is reached, finishing the pellet soaking, thereby simulating a soaking stage of a belt type roasting machine adopting circulating smoke;
S15, after soaking of the pellets in the circulating baking cup is finished, closing an air supply fan, a flow control device, a gas tank, a gas flow control device and a burner, namely a hot air control valve II-I, a cold air exchange 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, an air supply fan II and an exhaust gas control valve II, and sequentially cooling the pellets with a cooling dust removing device III and an exhaust fan III, cooling cold air from the bottom of the circulating baking cup, and after the specified pellet cooling time is reached, finishing pellet cooling, thereby simulating the cooling stage of the belt type roasting machine adopting circulating smoke.
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