CN108645208B - No draught fan does not have switching-over valve steel scrap baking system - Google Patents
No draught fan does not have switching-over valve steel scrap baking system Download PDFInfo
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- CN108645208B CN108645208B CN201810760707.0A CN201810760707A CN108645208B CN 108645208 B CN108645208 B CN 108645208B CN 201810760707 A CN201810760707 A CN 201810760707A CN 108645208 B CN108645208 B CN 108645208B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000010438 heat treatment Methods 0.000 claims abstract description 108
- 239000000779 smoke Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 34
- 230000007246 mechanism Effects 0.000 claims description 30
- 239000003517 fume Substances 0.000 claims description 23
- 230000001681 protective effect Effects 0.000 claims description 22
- 239000002699 waste material Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 11
- 239000002912 waste gas Substances 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 9
- 238000000605 extraction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/39—Arrangements of devices for discharging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a steel scrap baking system without a draught fan and a reversing valve, which comprises a charging hopper, a heating furnace, a smoke exhaust hood and a steel scrap trough, wherein the steel scrap trough is arranged on a trough trolley; the heating furnace is arranged on a first layer of platform, the smoke exhaust hood slides along a first track on a second layer of platform, the second layer of platform is arranged on the first layer of platform, a second track is arranged below the first layer of platform, the second track is parallel or perpendicular to the first track, and the trough trolley slides along the second track; the heating furnaces are arranged in parallel by 1 or more, a smoke exhaust hood and a trough trolley are arranged above and below each heating furnace respectively Fang Junfen, a plurality of burners are arranged on two side surfaces of each heating furnace, a split flap valve is arranged at the bottom of each heating furnace, the smoke hood is moved away during charging, baking is completed, and a scrap steel trough is moved to a lifting position after receiving the materials and is lifted by a crown block. According to the invention, an induced draft fan and a reversing valve are not needed, exhaust gas is discharged through the smoke hood, so that exhaust gas pollution is reduced, a plurality of heating furnaces can be arranged side by side, feeding, baking and discharging are not influenced, and the working efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of waste steel baking, and particularly relates to a waste steel baking system without a draught fan and a reversing valve.
Background
In the steel production, in order to save energy and reduce consumption, the scrap steel is usually required to be preheated, so that the energy consumption of a converter can be greatly reduced by heating the scrap steel in terms of economic benefit, meanwhile, the smelting time is shortened, the service life of a furnace lining is prolonged, the electrode consumption is reduced, the maintenance cost is reduced, the yield is improved, the steel grade quality is improved, and the comprehensive economic benefit is huge. The industrial enterprises are households with large energy consumption, the energy consumption is reduced, the emission of greenhouse gases and other nitrogen oxides can be greatly reduced, the environmental treatment is positively influenced, and the social benefit is obvious.
The traditional scrap steel preheating system has the advantages of single setting form, uneven scrap steel heating, small single scrap steel heating amount, low heating efficiency, low fuel utilization rate, large waste gas production amount and serious pollution, and usually needs to be added with a draught fan and a reversing valve to remove waste gas; the material leakage frequently occurs in the feeding and discharging processes, potential safety hazards exist and the environment is polluted, and due to the limitation of the arrangement mode, the traditional preheating device is not tightly matched with the steelmaking process, and the working efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a waste steel baking system without an induced draft fan and a reversing valve, which has the advantages of reasonable structural arrangement, novel form, simple structure, no need of installing an induced draft fan and a reversing valve, no mutual influence of feeding, baking and discharging, great improvement of working efficiency, solving of the problem of material leakage in the prior art, discharge of waste gas generated in baking through a smoke hood, reduction of waste gas emission and environmental pollution, and further realization of energy conservation and consumption reduction.
The aim and the technical problems of the invention are realized by adopting the following technical proposal. The invention provides a draught-fan-free reversing-valve-free steel scrap baking system, which comprises a charging hopper, a heating furnace, a steel scrap trough, a smoke exhaust hood, a trough trolley, a steel scrap trough and a control unit, wherein the steel scrap trough is arranged on the trough trolley; the heating furnace is arranged on a first layer of platform, a second layer of platform is arranged right above the first layer of platform, the smoke exhaust hood slides along a first track arranged on the second layer of platform, a second track is arranged on the ground below the first layer of platform, the second track is parallel or perpendicular to the first track, and a scrap steel loading groove of the groove trolley slides along the second track;
the heating furnaces are provided with 1 or more heating furnaces side by side, smoke exhaust hoods are arranged above each heating furnace, and the smoke exhaust hoods slide along the first track; a trough trolley is arranged below each heating furnace, and a set of scrap steel baking system is formed by the heating furnaces, the smoke exhaust hood, the trough trolley and scrap steel troughs on the trough trolley; the smoke exhaust hood is connected with the smoke exhaust pipe through a quick-change connector;
the two sides of the heating furnace are provided with a plurality of burners, each burner comprises a first layer of burner, a second layer of burner and a third layer of burner, the first layer of burner, the second layer of burner and the third layer of burner are arranged at equal intervals or unequal intervals in the vertical direction, the ventilation pipeline of each burner is communicated with an air annular pipeline and a gas annular pipeline, the air annular pipeline and the gas annular pipeline are respectively communicated with an air main pipeline and a gas main pipeline, and the air main pipeline is connected with a fan arranged on a layer of platform;
the bottom of the heating furnace is provided with a split type flap valve, in a baking state, the split type flap valve is closed, when the material is discharged, the split type flap valve is opened, the opening and the closing of the split type flap valve are realized through first hydraulic mechanisms arranged on two sides of a protective cover of the heating furnace, one end of each first hydraulic mechanism is connected with the protective cover or a rack of the heating furnace, and the other end of each first hydraulic mechanism is connected with the split type flap valve; the two end faces of the heating furnace are also provided with second hydraulic mechanisms which further strengthen the closed flap valve so as to reduce the impact of steel scraps in the charging hopper on the flap valve when falling down during charging.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures.
The scrap steel baking system is characterized in that the trough trolley is further provided with limiting columns 27, wherein the number of the limiting columns is 2 or more, and the limiting columns are arranged along two sides or the periphery of the trough trolley.
The steel scrap baking system is characterized in that a guide hopper is further arranged right below the heating furnace, is of an up-down communication structure, slides up and down along a third track arranged on the frame, falls down to contact with a steel scrap trough during material receiving, and moves upwards after the material receiving is finished; the set of scrap steel baking system further comprises the guide hopper.
The steel scrap baking system comprises a split type flap valve, wherein the split type flap valve comprises a left flap valve and a right flap valve, three-level sealing is realized by a first sealing surface, a second sealing surface and a sealing ring when the left flap valve and the right flap valve are closed, the first sealing surface is formed into cone sealing by respective conical surfaces on the left flap valve and the right flap valve, the second sealing surface is formed into cone sealing by the conical surfaces on a furnace body and the conical surfaces on the left flap valve and the right flap valve, and the sealing ring is arranged between the furnace body and the flap valve and is tightly pressed and sealed by bolts; the flap valve on each side is connected with a plurality of first hydraulic mechanisms, and the opening angle of the opposite-opening flap valve is adjusted according to the travel of the first hydraulic mechanisms.
The steel scrap baking system is characterized in that the second track is parallel to the first track, the steel scrap baking systems are arranged side by side, the plurality of trough trolleys slide along the same second track, two adjacent steel scrap baking systems are in one group, and a steel scrap trough lifting position is reserved between the two adjacent groups.
The second track is perpendicular to the first track, the plurality of scrap steel baking systems are arranged side by side, one second track is correspondingly arranged below each heating furnace, namely the number of the second tracks is equal to that of the heating furnaces, the scrap steel feed groove loaded by the feed groove trolley moves out of the heating furnaces along the second track, and the crown block is lifted.
In the steel scrap baking system, the number of the burners on the two sides of the heating furnace is equal or unequal, and the burners on the two sides are symmetrically or asymmetrically arranged; the number of the first layer of burners, the number of the second layer of burners and the number of the third layer of burners are equal or unequal, the burners of two adjacent layers on the same side face are aligned or arranged in a staggered manner, and the burners of the same layer on the two side faces are aligned or arranged in a staggered manner.
In the scrap steel baking system, the number of the burners on the two sides of the heating furnace is unequal and asymmetrically arranged; the burners of two adjacent layers on the same side face are arranged in a staggered way, and the burners of the same layer on the two side faces are arranged in a staggered way.
The scrap steel baking system is characterized in that an automatic ignition hole is formed below each combustor, each combustor is provided with a protective cap, the protective caps are located above the automatic ignition holes, the automatic ignition holes are flush with the inner wall of the heating furnace body, the shell of each protective cap extends into the furnace body, and the top of each protective cap is bent downwards and is in arc transition; the included angle alpha between the inclined furnace wall at the upper end of the protective cap and the horizontal direction is 30-60 degrees.
In the scrap steel baking system, the inner wall of the bottom of the heating furnace body is parallel to the vertical direction or inclined to the inside of the furnace body by a certain angle, and the inclined angle beta is 0-45 degrees.
In the scrap steel baking system, during charging, the smoke exhaust hood is detached from the smoke exhaust pipe through the quick-change connector, the smoke exhaust hood slides along the first track to give off a charging port of the heating furnace, and the crown block lifts the charging hopper to the position above the charging port for charging;
during baking, the fume exhaust hood slides to the position above the charging hole of the heating furnace along the first rail and is connected with the fume exhaust pipe through the quick-change connector, so that waste gas generated by baking waste steel is exhausted;
when the baking is finished and the material is discharged, the guide hopper slides downwards along the third track to contact with the scrap steel trough, and the second hydraulic mechanism and the first hydraulic mechanism drive the split type flap valve to be opened for discharging;
and after the unloading is finished, the trough trolley loads the scrap steel trough to slide to a lifting position along the second rail, and the overhead travelling crane lifts away the scrap steel trough.
In the steel scrap baking system, the single steel scrap heating amount of the heating furnace is 25-50 tons and can be 35 tons.
By means of the technical scheme, the invention has the advantages that:
(1) According to the invention, an induced draft fan and a reversing valve are not needed, waste gas generated in baking is discharged through the smoke hood, so that the discharge amount of the waste gas and the pollution to the environment are reduced, and the energy conservation and the consumption reduction are further realized.
(2) The heating furnaces can be arranged side by side, feeding, baking and discharging are not mutually influenced, the heating furnace is large in size, the amount of waste steel baked by each heating furnace for a single time is about 35 tons, and the preheating efficiency of the waste steel can be greatly improved by the plurality of baking systems arranged side by side.
(3) The burner of heating furnace unilateral adopts three-layer or multilayer overall arrangement, and original heating furnace unilateral combustor arranges into one row, and the heating is inhomogeneous, and this heating system promotes the single heating capacity of heating furnace, and unilateral combustor adopts three-layer or multilayer overall arrangement simultaneously, and the combustor dislocation overall arrangement between layer and the layer has not only increased the heating and has toasted the ability, makes the steel scrap heating more even moreover, improves fuel utilization and heating efficiency.
(4) The problem of leaking materials that exists among the prior art is solved through increasing loading hopper and guide hopper, because loading hopper and guide hopper bottom all adopt the flap valve that is split, and sealing performance is good when this flap valve is closed, when opening, the flap valve that is split can play the effect of guiding materials, makes the steel scrap follow the inner wall of flap valve and take advantage of the situation and descend, gets into the heating furnace from the loading hopper or toasts and get into the silo dolly from the heating furnace, leak materials problem when avoiding the blowing.
The heating furnace is not convenient for long-term use and maintenance, the heating furnace does not need to move back and forth to charge and discharge, the crown block lifts the scrap steel materials to the upper part of the heating furnace during charging, and the flap valve is opened through the hydraulic mechanism to discharge during discharging, and the flap valve plays a role in guiding materials during discharging so as to avoid leakage.
(5) The invention has reasonable structure and arrangement, novel form and strong applicability, can flexibly adjust the track direction and the number of baking systems according to the working condition of the production site, and can arrange a plurality of baking systems side by side under the condition of site permission, thereby improving the working efficiency.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the advantages and other objects, features and advantages of the present invention may be more readily understood, as exemplified by the following detailed description of the preferred embodiments.
Drawings
FIG. 1 is a schematic view of the second track and the first track in parallel;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a schematic view of the second track perpendicular to the first track;
FIG. 4 is a schematic view of a heating furnace;
FIG. 5 is an enlarged view of portion A of FIG. 4;
FIG. 6 is a schematic illustration of the open state of the split flap valve;
FIG. 7 is a schematic diagram of the furnace body in top view when burners on both sides of the heating furnace are symmetrically arranged;
FIG. 8 is a schematic diagram of a furnace body in plan view when burners on both sides of a heating furnace are asymmetrically arranged.
[ element and symbol description ]
1: hopper 2: heating furnace 3: smoke exhaust hood 4: trough trolley 5: one deck platform
6: first track 7: two-layer platform 8: second rail 9: scrap steel chute 10: third track
11: first layer burner 12: the second layer burner 13: third layer burner 14: air ring line 15: gas annular pipe 16: air main line 17: gas main line 18: blower fan
19: first hydraulic mechanism 20: left side flap valve 21: right rollover valve 22: first sealing surface
23: second hydraulic mechanism 24: quick-change connector 25: smoke exhaust pipe 26: guide hopper 27: spacing post
28: furnace body 29: sealing ring 30: second sealing surface 31: split flap valve at bottom of charging hopper
32: sealing strip 33: automatic ignition hole 34: protective cap 35: furnace wall with inclined upper end of protective cap
36: inner wall of furnace bottom
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description refers to the specific implementation, structure, characteristics and effects of the induced-draft-fan-free reversing-valve-free steel scrap baking system according to the invention by combining the accompanying drawings and the preferred embodiment.
In the description of the present invention, the terms indicating the azimuth are as follows: the above, below, left, right, etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and are not indicative or implying that the apparatus or elements in question must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Taking fig. 1 as an example, the induced-draft-fan-free reversing-valve-free steel scrap baking system comprises a large-capacity steel scrap charging hopper 1, a steel scrap heating furnace 2, a smoke exhaust hood 3 and a movable trough trolley 4, wherein the heating furnace 2 is arranged on a layer of platform 5, and the position of the heating furnace is not moved during charging, baking and discharging. The smoke exhaust hood 3 slides left and right along a first rail 6 arranged on a second-layer platform 7, the second-layer platform is positioned right above the first-layer platform, a second rail 8 is arranged on the ground below the first-layer platform, the second rail 8 is parallel to the first rail 6 on the second-layer platform, in fig. 1, a movable trough trolley 4 slides left and right along the second rail 8, and a scrap steel trough 9 (abbreviated as a trough) and a limiting column 27 are arranged on the movable trough trolley 4; the limit posts are at least 2, and can be arranged along two sides or four sides of the trough trolley 4, and the limit posts are used for limiting the placement position of the scrap steel trough and preventing the scrap steel trough 9 from excessively shifting in the placement process. The first-layer platform and the second-layer platform are built through a steel frame structure and are fixed on the ground.
A guide hopper 26 is arranged right below the heating furnace 2, is of an up-down communication structure, slides up and down along a third rail 10 arranged on the frame, falls down to contact with a scrap steel trough during material receiving, and moves upwards after material discharging.
The fume exhaust hood is connected with the fume exhaust pipe 25 through the quick-change connector 24, and when the fume exhaust hood needs to be shifted, the fume exhaust hood is quickly disassembled through the quick-change connector, and when the waste steel is baked to be exhausted, the fume exhaust hood is quickly connected with the fume exhaust pipe 25 through the quick-change connector.
The waste steel heating furnaces 2 set up 1 or more side by side, the top of every waste steel heating furnace 2 all is provided with fume extraction hood 3, the below of every waste steel heating furnace 2 all is provided with guide hopper and portable silo dolly 4, fume extraction hood 3, waste steel heating furnace 2, guide hopper 26, portable silo dolly 4 and above waste steel silo 9 form a set waste steel baking systems.
When a plurality of scrap steel baking systems are arranged side by side, every two scrap steel baking systems are in one group, and a scrap steel trough lifting position is reserved between two adjacent groups, as shown in fig. 1.
The heating furnace position is motionless, and during the reinforced, the fume extraction hood of the steel scrap heating furnace top that needs to feed is dismantled separately through quick change joint with the fume extraction pipe fast, and fume extraction hood slides along first track 6 and gives way the charge door of heating furnace, and the overhead traveling crane is used to the charging directly over the steel scrap heating furnace to the charging hopper, and the charging is accomplished the overhead traveling crane and is left the loading hopper handling, and fume extraction hood slides directly over the heating furnace, is connected with fume extraction pipe through quick change joint fast, discharges fume when the steel scrap toasts. The baking is completed, the flap valve at the bottom of the heating furnace is opened through the hydraulic mechanism to discharge, the scrap steel material enters the trough trolley 4 through the guide hopper, the discharging is completed, the flap valve at the bottom of the heating furnace is closed, the guide hopper slides upwards along the third track, the movable trough trolley 4 is enabled to load the scrap steel trough 9 to slide to a lifting position along the second track 8, and the crown block lifts away the baked scrap steel material to discharge. The movable trough trolley 4 is used for loading the empty scrap steel trough 9 to slide to the lower part of the heating furnace to continuously prepare for receiving. During receiving, the guide hopper slides downwards, the upper port of the guide hopper is aligned with the bottom of the heating furnace, and the lower port of the guide hopper is aligned with the scrap steel trough 9.
In fig. 1, four sets of scrap steel baking systems are provided, and the scrap steel baking systems are numbered 1#, 2#, 3#, and 4# in sequence from left to right, wherein two sets are provided, the scrap steel tanks of the 2# baking system and the 3# baking system are lifted by the reserved positions in the middle, and the scrap steel tanks of the 1# baking system and the 4# baking system are respectively slid to the left lifting position and the right lifting position of fig. 1 for lifting. Similarly, the moving direction of the smoke exhaust hood on the two-layer platform is consistent with the moving direction of the corresponding scrap steel trough, and when the scrap steel trough is lifted, the corresponding smoke exhaust hood needs to slide along the first track to leave a vacancy.
The two sides of the heating furnace 2 are provided with a plurality of burners, including a first layer of burners 11, a second layer of burners 12 and a third layer of burners 13, wherein the first layer of burners 11, the second layer of burners 12 and the third layer of burners 13 are arranged at equal intervals or unequal intervals in the vertical direction, according to the situation. The number of the burners on the two sides can be equal or unequal, the burners on the two sides can be symmetrically arranged or asymmetrically arranged, and the burners on the same layer on the two sides are aligned or staggered.
A scheme is as follows: the number of the burners on two sides of the heating furnace body is equal and symmetrically arranged, the number of the burners on the first layer, the number of the burners on the second layer and the number of the burners on the third layer can be equal or unequal, the burners between the layers are arranged in a staggered manner, and the burners on the same layer on two sides are symmetrically arranged, as shown in fig. 2, 4 and 7.
Another scheme is as follows: the number of the burners on two sides of the heating furnace body is unequal and asymmetric, the number of the burners on the first layer, the number of the burners on the second layer and the number of the burners on the third layer can be equal or unequal, the burners on the same side face layer and the burners on the same layer are arranged in a staggered manner, and the burners on the same layer on two sides are arranged in a staggered manner as shown in fig. 8.
The ventilation pipeline of each burner is communicated with an air annular pipeline 14 and a gas annular pipeline 15, the air annular pipeline and the gas annular pipeline are respectively communicated with an air main pipeline 16 and a gas main pipeline 17, and the air main pipeline is connected with a fan 18 arranged on a layer of platform.
Further, an automatic ignition hole 33 is formed below each burner, each burner is provided with a protective cap 34, the protective caps 34 are positioned above the automatic ignition holes 33, the automatic ignition holes are flush with the inner wall of the heating furnace body, the shell of each protective cap extends into the furnace body, and the top of each protective cap is bent downwards and is in arc transition; the inclined furnace wall 35 at the upper end of the helmet forms an angle alpha with the horizontal of between 30 and 60 deg., preferably 45 and 55 deg., such as 51 deg..
The inner wall 36 at the bottom of the heating furnace body is parallel to the vertical direction or inclined to the inside of the furnace body by a certain angle beta of 0-45 degrees, such as 25 degrees; the two sides of the heating furnace body are provided with a plurality of layers of reinforcing ribs which are distributed in a cross shape in a staggered way, and the burner is positioned at the cross-shaped crossing point of the reinforcing ribs.
The bottom of the heating furnace is provided with a split type flap valve, in a baking state, the split type flap valve is closed, the split type flap valve is opened during discharging, the opening and the closing of the split type flap valve are realized through a first hydraulic mechanism 19 arranged on two sides of a protective cover of the heating furnace, specifically, the split type flap valve comprises a left side flap valve 20 and a right side flap valve 21, three-level sealing is realized by the left side flap valve and the right side flap valve through a first sealing surface 22, a second sealing surface 30 and a sealing ring 29 when the split type flap valve is closed, the first sealing surface 22 forms cone sealing by respective conical surfaces on the left side flap valve and the right side flap valve, the second sealing surface 30 forms cone sealing by the conical surfaces on a furnace body 28 and the conical surfaces on the left side flap valve and the right side flap valve, and the sealing ring 29 is arranged in a groove on the inner wall of the furnace body, is positioned between the furnace body and the flap valve and is tightly sealed through bolts; a plurality of first hydraulic mechanisms 19 are connected to the flap valve on each side. One embodiment is that 4 first hydraulic mechanisms are connected to the flap valve on each side, and the 4 first hydraulic mechanisms are fixed on a protective cover of the heating furnace. As shown in fig. 2. The opening angle of the split type flap valve can be adjusted according to the stroke of the first hydraulic mechanism, and the adaptability is high. During discharging, the split type flap valve can play a certain role in guiding materials, and the condition of material leakage is avoided. The two end faces of the heating furnace are also provided with a second hydraulic mechanism 23, which second hydraulic mechanism 23 is used for further sealing the closed flap valve.
Preferably, the left side flap valve is further provided with a groove, and a sealing strip 32 is fixedly arranged in the groove, as shown in fig. 6. The sealing strip 32 acts as a further seal when the flap valve is closed. Or a sealing strip is arranged on the right side flap valve.
The bottom of the charging hopper also adopts a split type flap valve structure, as shown in figure 1, the flap valve at the bottom is opened during charging to form an inverted eight shape, so that the falling scrap steel material is guided, and the material leakage condition is avoided.
The working method of the invention comprises the following steps:
during charging, the smoke exhaust hood 3 is detached from the smoke exhaust pipe through the quick-change connector, the smoke exhaust hood slides along the first track to give up a charging port of the heating furnace, the crown block lifts the charging hopper to the position above the charging port for charging, the split type flap valve at the bottom of the charging hopper is opened, the material guiding effect is achieved, and material leakage is avoided;
during baking, the fume exhaust hood slides to the position above the charging hole of the heating furnace along the first rail and is connected with the fume exhaust pipe through the quick-change connector, so that waste gas generated by baking waste steel is exhausted;
when baking is finished and discharging is performed, the guide hopper slides downwards along the third track to contact with the scrap steel trough, the second hydraulic mechanism and the first hydraulic mechanism drive the split type flap valve to open for discharging, and the opened split type flap valve plays a role in guiding materials, so that leakage of materials is avoided;
and after the unloading is finished, the trough trolley loads the scrap steel trough to slide to a lifting position along the second rail, and the overhead travelling crane lifts away the scrap steel trough.
In another embodiment of the invention, as shown in fig. 3, the second rail 8 is perpendicular to the first rail 6, and in fig. 3, the smoke exhaust hood moves left and right along the first rail 6, and when in charging, the smoke exhaust hood moves to make a room for charging of the charging hopper, and when in baking, the smoke exhaust hood moves to the upper part of the heating furnace for smoke exhaust. And the trough trolley slides back and forth along the second track in the direction shown in fig. 3, when the heating furnace discharges, the trough trolley loads the scrap steel trough and is positioned below the guide hopper, the heating furnace discharges, the trough trolley slides along the second track to the front or the rear of the diagram and moves out from below the heating furnace, and moves to the air space, and the overhead crane lifts away the scrap steel trough.
The smoke exhaust hood can be connected with an exhaust device arranged on site to increase smoke exhaust power, and the technology belongs to the prior art and is not repeated here.
Whether the second track is parallel or perpendicular to the first track in practical application is mainly chosen according to the actual field. According to the on-site situation, when the lifting height of the crown block is too low, the trough trolley can be placed on the ground, namely, a second track is not arranged.
The present invention is not limited to the preferred embodiments, and any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention will fall within the scope of the technical principles of the present invention, as will be apparent to those skilled in the art without departing from the scope of the technical principles of the present invention.
Claims (10)
1. The steel scrap baking system without the induced draft fan and the reversing valve comprises a charging hopper (1), a heating furnace (2) and a steel scrap trough (9), and is characterized by further comprising a smoke exhaust hood (3) and a trough trolley (4), wherein the steel scrap trough (9) is arranged on the trough trolley (4); the heating furnace (2) is arranged on a first layer of platform (5), a second layer of platform (7) is arranged right above the first layer of platform, the smoke exhaust hood (3) slides along a first track (6) arranged on the second layer of platform (7), a second track (8) is arranged on the ground below the first layer of platform, the second track (8) is parallel or perpendicular to the first track (6), and a scrap steel trough (9) loaded by the trough trolley (4) slides along the second track (8); a limiting column (27) is also arranged on the trough trolley (4);
the heating furnaces (2) are arranged in parallel with 1 or more, smoke exhaust hoods (3) are arranged above each heating furnace (2), and the smoke exhaust hoods slide along the first track (6); a trough trolley (4) is arranged below each heating furnace, and a set of scrap steel baking system is formed by the heating furnaces (2), the smoke exhaust hood (3), the trough trolley (4) and a scrap steel trough (9) on the trough trolley; the smoke exhaust hood (3) is connected with a smoke exhaust pipe (25) through a quick-change connector (24);
the two sides of the heating furnace (2) are provided with a plurality of burners, each burner comprises a first layer of burners (11), a second layer of burners (12) and a third layer of burners (13), the first layer of burners (11), the second layer of burners (12) and the third layer of burners (13) are arranged at equal intervals or unequal intervals in the vertical direction, two adjacent burners on the same side are aligned or staggered, and the same burners on the two sides are aligned or staggered; the ventilation pipeline of each burner is communicated with an air annular pipeline (14) and a gas annular pipeline (15), the air annular pipeline and the gas annular pipeline are respectively communicated with an air main pipeline (16) and a gas main pipeline (17), and the air main pipeline is connected with a fan (18) arranged on a layer of platform;
the bottom of the heating furnace is provided with a split type flap valve, in a baking state, the split type flap valve is closed, when the material is discharged, the split type flap valve is opened, the opening and the closing of the split type flap valve are realized through first hydraulic mechanisms (19) arranged on two sides of a protective cover of the heating furnace, one end of each first hydraulic mechanism (19) is connected with the protective cover or a frame of the heating furnace, and the other end of each first hydraulic mechanism is connected with the split type flap valve; the two end surfaces of the heating furnace are also provided with second hydraulic mechanisms (23), and the second hydraulic mechanisms (23) further strengthen the closed flap valve seal.
2. The scrap steel roasting system of claim 1, wherein the limit posts (27) are 4 or more, and are provided along both sides or around the trough cart (4).
3. The scrap steel baking system in accordance with claim 1, characterized in that a guide hopper (26) is further provided under the heating furnace (2), the guide hopper is of an up-down communication structure, slides up and down along a third rail (10) provided on the frame, falls down to contact with the scrap steel trough during material receiving, and moves upward after material receiving; the set of scrap steel baking system further comprises the guide hopper.
4. The steel scrap roasting system of claim 1, wherein the split flap valve comprises a left flap valve (20) and a right flap valve (21), three-stage sealing is realized by the left flap valve and the right flap valve through a first sealing surface (22), a second sealing surface (30) and a sealing ring (29) when the left flap valve and the right flap valve are closed, the first sealing surface (22) forms a cone seal by the respective conical surfaces on the left flap valve and the right flap valve, the second sealing surface (30) forms a cone seal by the conical surfaces on the furnace body (28) and the conical surfaces on the left flap valve and the right flap valve, and the sealing ring (29) is arranged between the furnace body and the flap valve and is tightly sealed by bolt compression; the flap valve on each side is connected with a plurality of first hydraulic mechanisms (19), and the opening angle of the opposite-opening flap valve is adjusted according to the travel of the first hydraulic mechanisms.
5. A scrap roasting system in accordance with claim 1, characterized in that the second rail (8) is parallel to the first rail (6), a plurality of scrap roasting systems are arranged side by side, a plurality of trolleys slide along the same second rail (8), two adjacent scrap roasting systems are grouped together, and a scrap chute lifting position is reserved between the two adjacent groups.
6. A scrap roasting system in accordance with claim 1, characterized in that the second rail (8) is perpendicular to the first rail (6), a plurality of scrap roasting systems are arranged side by side, one second rail is arranged under each heating furnace, i.e. the number of the second rails is equal to the number of the heating furnaces, the loading scrap tanks of the tank car are moved out from the lower parts of the heating furnaces along the second rails, and the crown block is lifted.
7. The scrap roasting system of claim 1, wherein the number of burners on both sides of the heating furnace is equal or unequal, and the burners on both sides are symmetrically or asymmetrically arranged; the number of the first layer of burners, the second layer of burners and the third layer of burners are equal or unequal.
8. The scrap steel roasting system of claim 1, wherein an automatic ignition hole (33) is provided below each burner, each burner is provided with a protective cap (34), the protective caps (34) are positioned above the automatic ignition holes (33), the automatic ignition holes are flush with the inner wall of the furnace body, the shell of the protective caps extends into the furnace body, and the tops of the protective caps are downwards bent and are in arc transition; the included angle alpha between the inclined furnace wall (35) at the upper end of the protective cap and the horizontal direction is 30-60 degrees.
9. A scrap roasting system in accordance with claim 1, characterized in that the inner wall (36) of the bottom of the heating furnace body is parallel to the vertical or inclined to the inside of the furnace body by an angle β of 0-45 °.
10. The steel scrap baking system in accordance with claim 1 wherein during charging, the fume extractor hood (3) is detached from the fume extractor hood by a quick change connector, the fume extractor hood slides along the first track to clear the charging port of the heating furnace, and the crown block lifts the hopper to above the charging port for charging;
during baking, the fume exhaust hood slides to the position above the charging hole of the heating furnace along the first rail and is connected with the fume exhaust pipe through the quick-change connector, so that waste gas generated by baking waste steel is exhausted;
when baking is finished and discharging is performed, the guide hopper slides downwards along the third track to contact with the scrap steel trough, the second hydraulic mechanism and the first hydraulic mechanism drive the split type flap valve to open for discharging, and the split type flap valve at the bottom of the guide hopper is opened for guiding materials;
and after the unloading is finished, the trough trolley loads the scrap steel trough to slide to a lifting position along the second rail, and the overhead travelling crane lifts away the scrap steel trough.
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| CN201810760707.0A CN108645208B (en) | 2018-07-12 | 2018-07-12 | No draught fan does not have switching-over valve steel scrap baking system |
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| CN201810760707.0A CN108645208B (en) | 2018-07-12 | 2018-07-12 | No draught fan does not have switching-over valve steel scrap baking system |
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| CN108645208B true CN108645208B (en) | 2023-11-10 |
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| CN109455618B (en) * | 2018-12-25 | 2020-09-25 | 北京碧水源科技股份有限公司 | Hoisting system for MBR (Membrane bioreactor) membrane module in membrane workshop of buried sewage treatment plant and application of hoisting system |
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| CN107387781A (en) * | 2017-08-15 | 2017-11-24 | 洛阳沃达节能科技有限公司 | Alloy heating furnace turnover panel valve seal mechanism |
| CN107475483A (en) * | 2017-09-21 | 2017-12-15 | 洛阳沃达节能科技有限公司 | A kind of portable steel scrap on-line heating system |
| CN107574283A (en) * | 2017-09-21 | 2018-01-12 | 洛阳沃达节能科技有限公司 | A kind of off-line type scrap heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0132876A1 (en) * | 1983-07-27 | 1985-02-13 | DANECO-DANIELI ECOLOGIA Spa | Improvements to hoods for aspiration of secondary fumes in steel mills and foundries |
| JPH10300366A (en) * | 1997-04-18 | 1998-11-13 | Daido Steel Co Ltd | Scrap preheating device |
| JP2010107066A (en) * | 2008-10-28 | 2010-05-13 | Sumikin Manegement Co Ltd | Sintering ignition furnace and method of manufacturing sintered ore |
| DE102015209230A1 (en) * | 2015-05-20 | 2016-11-24 | Gvp Gesellschaft Zur Vermarktung Der Porenbrennertechnik Mbh | oven assembly |
| CN107387781A (en) * | 2017-08-15 | 2017-11-24 | 洛阳沃达节能科技有限公司 | Alloy heating furnace turnover panel valve seal mechanism |
| CN107475483A (en) * | 2017-09-21 | 2017-12-15 | 洛阳沃达节能科技有限公司 | A kind of portable steel scrap on-line heating system |
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