CN109434014B - Waste sand roasting system - Google Patents
Waste sand roasting system Download PDFInfo
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- CN109434014B CN109434014B CN201811361639.7A CN201811361639A CN109434014B CN 109434014 B CN109434014 B CN 109434014B CN 201811361639 A CN201811361639 A CN 201811361639A CN 109434014 B CN109434014 B CN 109434014B
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- roasting
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- 239000004576 sand Substances 0.000 title claims abstract description 226
- 239000002699 waste material Substances 0.000 title claims abstract description 88
- 238000007789 sealing Methods 0.000 claims abstract description 73
- 238000001035 drying Methods 0.000 claims abstract description 39
- 230000007246 mechanism Effects 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005266 casting Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 46
- 238000002485 combustion reaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
Abstract
The invention belongs to the technical field of casting material processing equipment, and particularly discloses a waste sand roasting system which comprises a drying tower, a furnace body and an air inlet unit, wherein the lower end of the drying tower is communicated with the upper part of the furnace body; an upper sealing plate is arranged in the furnace body, and a plurality of longitudinally distributed communicating channels are arranged on the upper sealing plate; the furnace body is provided with a burner communicated with the upper roasting layer; an upper sand conveying device is arranged on one side of the furnace body, which is far away from the drying tower, and a lower sand conveying device is arranged on the other side of the furnace body, wherein the upper sand conveying device and the lower sand conveying device comprise a closed box, a sand position control mechanism and a sand conveying pipe; the upper end of the upper sand feeding device sealing box is communicated with the upper roasting layer, and a sand feeding pipe of the upper sand feeding device is communicated with the lower roasting layer; the upper end of the lower sand feeding device sealing box is communicated with the lower roasting layer. The waste sand roasting system of the scheme is low in cost, short in construction period and low in energy consumption, and the problem that the existing roasting furnace cannot enable waste sand to be boiled sufficiently and the waste sand roasting effect is poor can be solved by using the technical scheme.
Description
Technical Field
The invention belongs to the technical field of casting material processing equipment, and particularly relates to a waste sand roasting system.
Background
The roasting furnace is main equipment of a casting waste sand thermal method regeneration technology, and the waste sand is roasted at high temperature to enable a coating layer on the surface of the waste sand to fall off, so that the waste sand can be regenerated and reused.
The roasting furnace commonly used at present is a vertical two-layer roasting furnace, the upper part of the furnace body is connected with a feeding pipe, a sealing plate is arranged in the furnace body, the sealing plate divides the furnace body into an upper combustion chamber and a lower combustion chamber, the bottom of the furnace body is connected with a discharging pipe and is communicated with a main pipe, and a combustor is arranged in the main pipe. The specific flow of the roasting furnace during operation is as follows: and adding waste sand into the upper combustion chamber through a feed pipe, enabling the waste sand to flow on a sealing plate, then falling into the lower combustion chamber in sequence, and finally discharging through a discharge pipe. At the same time, the burner heats the air in the main pipe, so that the temperature of the air is increased, the main pipe is filled with hot air into the lower combustion chamber, and the hot air heats the waste sand. In the process, air flows from the lower combustion chamber to the upper combustion chamber in sequence, and finally is discharged through a feed pipe; there are two paths for air to flow from the lower chamber to the upper chamber, the first path being directly through the sealing plate to the upper chamber and the second path being in the opposite direction to the flow of the spent sand.
The roasting furnace using the above structure has the following drawbacks: 1. the roasting furnace is arranged in a vertical mode, the roasting furnace has higher requirements on the height of a production factory, and the roasting furnace is inconvenient to manufacture, install, produce and maintain. 2. The flowing direction of the introduced air is opposite to the flowing direction of the waste sand, and the air exerts an acting force opposite to the flowing direction of the waste sand on the waste sand, so that the normal flowing of the waste sand is not facilitated, and the waste sand is easily accumulated; the air dispersedly flows, the air pressure flowing into the upper combustion chamber through the sealing plate is insufficient, waste sand in the upper combustion chamber is difficult to be boiled sufficiently, and the roasting effect of the waste sand is poor. 3. The waste sand temperature is raised by heat exchange between the hot air and the waste sand, the heat efficiency is low, and the consumed energy is large.
Disclosure of Invention
The invention aims to provide a waste sand roasting system, which solves the problems that the existing roasting furnace cannot fully boil waste sand and the waste sand roasting effect is poor.
In order to achieve the above purpose, the basic scheme of the invention is as follows: the device comprises a drying tower, a furnace body and an air inlet unit communicated with the bottom of the furnace body, wherein the lower end of the drying tower is communicated with the upper part of the furnace body; an upper sealing plate for dividing the furnace body into an upper roasting layer and a lower roasting layer is arranged in the furnace body, and a plurality of longitudinally distributed communication channels are arranged on the upper sealing plate; the furnace body is provided with a burner communicated with the upper roasting layer; an upper sand conveying device is arranged on one side of the furnace body, which is far away from the drying tower, and a lower sand conveying device is arranged on the other side of the furnace body, and the upper sand conveying device and the lower sand conveying device both comprise a closed box, a sand level control mechanism for controlling sand in the closed box to be at a fixed height and a sand conveying pipe communicated with the lower end of the closed box; the upper end of the upper sand feeding device sealing box is communicated with the upper roasting layer, and a sand feeding pipe of the upper sand feeding device is communicated with the lower roasting layer; the upper end of the lower sand feeding device sealing box is communicated with the lower roasting layer.
The beneficial effect of this basic scheme lies in:
1. the air inlet unit is used for introducing air into the furnace body, the air is heated into hot air in the furnace body, the hot air finally flows to the drying tower from the lower roasting layer to the upper roasting layer, the hot air dries and preheats the waste sand falling from the drying tower, so that the waste sand falls into the furnace body and then has higher temperature, the waste sand can be quickly heated to the required temperature when being heated by the burner in the furnace body, the heating time is shortened, and the energy is saved.
2. The upper sealing plate is arranged, so that the furnace body is divided into two layers, the effect of reducing the height of the sand layer can be achieved, the roasted sand is distributed more uniformly, and the waste sand can be heated.
3. An upper roasting layer and a lower roasting layer are arranged in the furnace body, the waste sand of the upper roasting layer is heated by the burner, so that the temperature of the waste sand of the upper roasting layer is increased to hundreds of degrees, and the waste sand heated by the upper roasting layer finally flows into the lower roasting layer. The air inlet unit is used for introducing air into the furnace body, the introduced air is firstly contacted and exchanges heat with the high Wen Feisha on the lower roasting layer, the temperature of the air is rapidly increased to become hot air, the hot air flows to the upper roasting layer, the waste sand on the upper roasting layer can be preheated, and the energy-saving effect can be achieved.
4. The sand level control mechanism in the upper sand feeding device and the lower sand feeding device controls the height of the waste sand in the closed box to be at a fixed height, namely, quantitative waste sand always exists in the closed box to plug the closed box, and air in the lower roasting layer can flow only through the upper sealing plate to the upper roasting layer when flowing, so that the air flowing path is controlled, the air flowing path is ensured, the air flowing upward sealing plate is ensured, the waste sand in the upper roasting layer can be fully boiled, and the roasting effect is ensured.
5. According to the technical scheme, the combustion mechanism of the roasting furnace is improved, the heat exchange between the hot air and the waste sand is changed into the heat of the flame of the burner to directly heat the waste sand, so that the heat efficiency is improved, and the roasting effect is better.
Further, the bottom of sending the sand pipe is equipped with the air chamber, and the upper wall of air chamber is equipped with a plurality of intercommunication mechanisms, and the intercommunication mechanism includes shroud and intercommunication send sand pipe and air chamber's inner tube, and the shroud is fixed at the upper wall of air chamber and cover and establish on the inner tube, opens the air outlet that keeps away from closed case one side on the lateral wall of shroud. When the sand conveying pipe is required to normally discharge sand, air is continuously blown into the air chamber, the air in the air chamber enters the inner pipe and then enters the cover cap through the inner pipe, and finally enters the sand conveying pipe through the air outlet on the side wall of the cover cap, and the air exerts an external force on the sand in the sand conveying pipe, so that the sand in the sand conveying pipe can flow in an accelerating manner, the sand is prevented from being blocked in the sand conveying pipe, and the sand discharging efficiency is improved. The inner pipe and the cover cap are arranged, so that air in the air chamber can smoothly enter the sand conveying pipe and simultaneously the upper end opening of the inner pipe is protected through the cover cap, and sand is prevented from entering the inner pipe and the air chamber.
Further, the waste sand roasting system further comprises a first controller; the sand level control mechanism comprises a first air blower communicated with the air chamber and a level gauge arranged in the closed box, and the first controller is electrically connected with the first air blower and the level gauge.
Further, the waste sand roasting system also comprises a second controller and a second air blower, wherein the second air blower is respectively communicated with the two air chambers through pipelines, a first valve is arranged on one pipeline, and a second valve is arranged on the other pipeline; the sand level control mechanism is a material level indicator arranged in the closed box, and the second controller is electrically connected with the first valve, the second valve and the material level indicator.
Further, sand level control mechanism includes third controller, the third air-blower and the charge level indicator of setting in the closed case with the air chamber intercommunication, and the third controller all is connected with third air-blower, charge level indicator electricity.
Further, the air inlet unit comprises a main pipe, and a plurality of air inlet branch pipes are connected between the main pipe and the bottom of the furnace body. When the roasting furnace works, air in the main pipe continuously enters the furnace body through the air inlet branch pipe, and enough air is provided for the normal work of the roasting furnace.
Further, a lower sealing plate positioned below the upper sealing plate is arranged in the furnace body, and a plurality of connecting channels are also arranged on the lower sealing plate; the gas flow section of the upper sealing plate connecting channel is smaller than that of the lower sealing plate connecting channel. So set up, on the one hand, the air can stop for a longer time in the lower roasting layer, has guaranteed the preheating effect of air in stopping in the lower roasting layer, on the other hand, can effectually guarantee the air and get into the internal flow strength of upper roasting, make the sand waste on the upper seal board fully boil, ensure that the sand waste can be heated fully.
Further, the upper sealing plate and the lower sealing plate are provided with the same number of connecting channels, each connecting channel comprises an air pipe and a hood arranged at the upper part of the air pipe, and the side wall of the hood is provided with an air hole; the number of the wind holes formed in the wind cap at the lower sealing plate is greater than that of the wind holes formed in the wind cap at the upper sealing plate. When the roasting furnace works, air is continuously introduced into the bottom of the furnace body through the air inlet unit, flows through the air pipe on the lower sealing plate, flows out through the air holes (hereinafter called lower air holes) of the air cap at the lower sealing plate, flows out through the air pipe on the upper sealing plate, and finally flows out through the air holes (hereinafter called upper air holes) of the air cap at the upper sealing plate.
Further, the upper portion of drying tower is connected with the inlet pipe, is equipped with multiunit dispersing part along the direction of height in the drying tower, and dispersing part includes the dispersion board of reverse V-arrangement and two symmetries set up and enclose into the collection material board of reverse splayed, and the collection material board is located the below of dispersion board. The dispersing part is arranged, the waste sand can be uniformly dispersed by the dispersing part, and hot air flowing from the roasting furnace to the drying tower can be ensured to be sufficiently heated, so that the waste sand can be quickly dried.
Further, the burner is fixed on the side wall of the furnace body far away from one side of the drying tower, and the nozzle of the burner faces to the upper sealing plate and forms an included angle of 30-45 degrees with the side wall of the furnace body. The hot air preheats the waste sand falling from the drying tower in the process of flowing to the drying tower, so that the temperature of the waste sand is increased, the waste sand finally falls on the upper sealing plate and flows towards the upper sand conveying device, and when the waste sand moves to the burner, the burner heats the waste sand. The angle of the burner is reasonably set, so that the burner can directly heat the waste sand more fully, and the heating effect is better.
Further, a high-temperature steel plate is arranged at the bottom of the upper sealing plate; the inner wall of the furnace body is provided with a connecting groove, and the high-temperature steel plate is arranged in the furnace body through the connecting groove. The high-temperature steel plate is arranged in the furnace body through the connecting groove, the upper sealing plate and the high-temperature steel plate are not rigid, when the air flow in the furnace body acts on the high-temperature steel plate and the upper sealing plate, the high-temperature steel plate can move relative to the furnace body, the stress is effectively buffered, and the high-temperature steel plate and the upper sealing plate are prevented from being damaged due to long-term stress.
Further, the lower end of the drying tower is communicated with the upper part of the furnace body through a corrugated pipe. When the roasting furnace works, hot air in the roasting furnace flows from the furnace body to the drying tower, and the drying tower receives acting force exerted by the hot air. The drying tower is connected with the furnace body through the corrugated pipe, the connection between the drying tower and the furnace body is not rigid, the stress of the drying tower can be effectively buffered, and the connection between the drying tower and the furnace body is prevented from being broken.
Further, the air outlet is positioned at the lower part of the side wall of the cover cap, and the upper end opening of the inner tube is positioned above the air outlet. The upper end opening of the inner tube is higher than the air outlet, so that waste sand can be prevented from entering the inner tube, and the smoothness of the communication mechanism is ensured.
Further, the furnace body comprises a ceramic fiber cotton heat-insulating refractory layer. The existing heat-insulating refractory layer is made of refractory bricks, the thickness of the refractory bricks is large, the weight of the refractory bricks is heavy, the whole volume of the furnace body is increased, in the scheme, ceramic fiber cotton is selected as the heat-insulating refractory layer, the weight of the ceramic fiber cotton is light, the heat-insulating effect is good, and the volume of the furnace body is effectively reduced while the heat-insulating effect of the furnace body is improved.
Drawings
FIG. 1 is a front view in cross section of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of a burner mounted on the side wall of a furnace body;
FIG. 3 is an enlarged view of portion A of FIG. 1;
FIG. 4 is an enlarged view of a portion of the upper sand feeding device of FIG. 1;
fig. 5 is an enlarged view of a portion B in fig. 4.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in fig. 1-5 of the specification include: furnace body 10, upper firing layer 11, lower firing layer 12, upper sealing plate 13, lower sealing plate 14, burner 15, connecting tank 16, upper sand feeder 20, closed box 21, sand feeder 22, air chamber 23, inner pipe 24, cover 25, air outlet 251, lower sand feeder 30, blower 40, main pipe 50, air inlet branch pipe 51, drying tower 60, dispersion plate 61, collecting plate 62, feeding pipe 63, bellows 64, high-temperature steel plate 70, air pipe 80, hood 81, and air hole 811.
Example 1
An example is substantially as shown in figure 1: the waste sand roasting system comprises a drying tower 60, a furnace body 10 and an air inlet unit communicated with the bottom of the furnace body 10, wherein the furnace body 10 comprises a ceramic fiber cotton heat-insulating refractory layer. The drying tower 60 is positioned above the right side of the furnace body 10, and a corrugated pipe 64 is communicated between the lower end of the drying tower 60 and the upper part of the furnace body 10. The upper portion of drying tower 60 is connected with inlet pipe 63, is equipped with multiunit dispersion portion along the direction of height in the drying tower 60, and the dispersion portion includes dispersion board 61 of reverse V-arrangement and two symmetry settings and encloses into the collection material board 62 of reverse splayed, and collection material board 62 is located the below of dispersion board 61.
Referring to fig. 2, a burner 15 is fixedly installed on a side wall of the furnace body 10 at a side far from the drying tower 60, and one or more burners 15 may be provided, and a plurality of burners are generally provided when the volume of the furnace body 10 is excessively large. The burner 15 is in communication with the upper firing layer 11, and the nozzle of the burner 15 faces the upper seal plate 13 and forms an angle of 30-45 degrees with the side wall of the furnace body 10, in this embodiment the burner 15 forms an angle of 45 degrees with the side wall of the furnace body 10. An upper sealing plate 13 and a lower sealing plate 14 positioned below the upper sealing plate 13 are arranged in the furnace body 10, the upper sealing plate 13 divides the furnace body 10 into an upper roasting layer 11 and a lower roasting layer 12, the lower roasting layer 12 is positioned between the upper sealing plate 13 and the lower sealing plate 14, and an air chamber is formed between the lower sealing plate 14 and the bottom of the furnace body 10. The upper sealing plate 13 and the lower sealing plate 14 are longitudinally penetrated with a plurality of connecting channels, the number of the connecting channels arranged on the upper sealing plate 13 and the lower sealing plate 14 is the same, the connecting channels in the embodiment comprise an air pipe 80 and a blast cap 81 fixedly connected to the upper part of the air pipe 80, a plurality of blast holes 811 uniformly distributed along the circumferential direction are formed in the side wall of the blast cap 81, and the number of the blast holes 811 (hereinafter referred to as lower blast holes 811) formed in the blast cap 81 positioned at the lower sealing plate 14 is greater than the number of the blast holes 811 (hereinafter referred to as upper blast holes 811) formed in the blast cap 81 positioned at the upper sealing plate 13. The bottom of the upper sealing plate 13 is welded with a high-temperature steel plate 70, and as shown in fig. 3, the four inner walls of the furnace body 10 are all provided with connecting grooves 16, the four sides of the high-temperature steel plate 70 are respectively clamped in the connecting grooves 16, and the high-temperature steel plate 70 is installed in the furnace body 10 through the connecting grooves 16.
The left side of the furnace body 10 is provided with an upper sand feeding device 20, the right side is provided with a lower sand feeding device 30, and the upper sand feeding device 20 and the lower sand feeding device 30 comprise a closed box 21, a sand level control mechanism and a sand feeding pipe 22, as shown in combination with fig. 4. One side of the sand feeding pipe 22 is provided with a sand inlet, the other side is provided with a sand outlet, and the lower end of the closed box 21 is communicated with the sand inlet. As shown in fig. 5, the bottom of the sand feeding pipe 22 is provided with an air chamber 23, the upper wall of the air chamber 23 is provided with a plurality of communication mechanisms, each communication mechanism comprises a cover 25 and an inner pipe 24 for communicating the sand feeding pipe 22 with the air chamber 23, the cover 25 is fixed on the upper wall of the air chamber 23 and covers the inner pipe 24, the side wall of the cover 25 is provided with an air outlet 251 facing to one side of the sand outlet, the air outlet 251 is positioned at the lower part of the side wall of the cover 25, and the upper end opening of the inner pipe 24 is positioned above the air outlet 251. The upper end of a closed box 21 (hereinafter referred to as an upper closed box) of the upper sand feeding device 20 is communicated with the upper roasting layer 11, the upper end of the upper closed box is positioned at an upper sealing plate 13, and waste sand flowing on the upper sealing plate 13 can enter the upper end of the upper closed box; the sand outlet of the sand feed pipe 22 (hereinafter referred to as an upper sand feed pipe) of the upper sand feed device 20 communicates with the lower firing layer 12. The lower sand feeding device 30 is communicated with the lower roasting layer 12 at the upper end of a closed box 21 (hereinafter referred to as a lower closed box), the upper end of the lower closed box is positioned at the lower sealing plate 14, and waste sand on the lower sealing plate 14 can enter the upper end of the lower closed box; the sand outlet of the sand feed pipe 22 (hereinafter referred to as a lower sand feed pipe) of the lower sand feed device 30 communicates with the outside.
The upper sand feeding device 20 and the lower sand feeding device 30 are both provided with a sand level control mechanism, and the sand level control mechanism in the embodiment comprises a third controller, a third blower and a level gauge, wherein the third blower and the level gauge are both electrically connected with the third controller. The third blower in the upper sand feeding device 20 is communicated with the air chamber 23 of the upper sand feeding pipe, and the level gauge in the upper sand feeding device 20 is arranged in the upper closed box; the third blower in the lower sand feeding device 30 is communicated with the air chamber 23 of the lower sand feeding pipe, and the level gauge in the lower sand feeding device 30 is arranged in the lower closed box. In this example, the material level measuring device used was a material level measuring device model QHC-ST-1 manufactured by Henan potential Automation technology Co., ltd. The controller used in this embodiment is a model MAM-210 controller manufactured by Shenzhen pulett electronics Inc.
The air inlet unit comprises a main pipe 50 and a fan 40 communicated with the main pipe 50, and a plurality of air inlet branch pipes 51 are connected between the main pipe 50 and the bottom of the furnace body 10. The air intake unit may be configured such that the main pipe 50 is connected to a third blower, and the third blower supplies air to the main pipe 50.
The specific implementation process is as follows: when the roasting furnace is used, the burner 15 is started, waste sand is fed into the drying tower 60 through the feeding pipe 63, the waste sand is uniformly dispersed under the action of the dispersing part, finally, the waste sand falls on the upper sealing plate 13 through the corrugated pipe 64, the waste sand flows towards one side of the upper sand feeding device 20, and flame sprayed by the burner 15 directly heats the waste sand in the flowing process, so that the temperature of the waste sand is rapidly increased. When the sand level in the upper closed box exceeds the specified height (in this embodiment, the specified sand level in the upper closed box is 600 nm), the corresponding third controller receives the signal sent by the material level indicator, the third controller controls the third air blower to work, the third air blower continuously blows air into the air chamber 23 of the upward sand feeding pipe, the air in the air chamber 23 enters the inner pipe 24, then enters the cover cap 25 through the inner pipe 24, finally enters the upward sand feeding pipe through the air outlet 251 on the side wall of the cover cap 25, and the air exerts an external force on the sand in the upward sand feeding pipe, so that the sand in the sand feeding pipe 22 flows to the lower roasting layer 12. When the sand level in the upper closed box is lower than the prescribed height, the third controller controls the third blower to stop working, and the sand in the upper sand feeding device 20 stops flowing. The waste sand in the lower roasting layer 12 flows to one side of the lower sand feeding device 30, the waste sand gradually falls into the lower sand feeding device 30, and the sand discharging principle of the lower sand feeding device 30 is the same as that of the upper sand feeding device 20, and the description thereof is omitted.
Meanwhile, air is introduced into the bottom of the furnace body 10 through the air inlet unit, flows through the air pipe 80 on the lower sealing plate 14, flows into the lower roasting layer 12 through the lower air holes 811, and is in contact with and exchanges heat with the waste sand in the lower roasting layer 12, and the temperature of the waste sand in the lower roasting layer 12 is rapidly increased after the air and the waste sand exchange heat due to the fact that the heating temperature of the waste sand in the lower roasting layer 12 is relatively high (about 400 ℃) and the hot air flows out of the air pipe 80 on the upper sealing plate 13 through the upper air holes 811, so that the waste sand on the upper sealing plate 13 is fully boiled by applying relatively high pressure to the waste sand. The hot air (the hot air naturally generated by the lower heat exchange air, the upper roasting layer burner and the waste sand) finally flows to the drying tower 60, and exchanges heat with the waste sand in the drying tower 60, so that the temperature of the waste sand falling from the drying tower 60 is increased from tens of degrees to hundreds of degrees, when the waste sand flows to the burner 15, the burner 15 can quickly increase the temperature of the waste sand to the required temperature, and compared with the waste sand directly heated by tens of degrees, the energy can be saved, the heating time is reduced, and meanwhile, the thermal efficiency is greatly improved.
Example 2
This embodiment differs from embodiment 1 in that: the waste sand roasting system further comprises a first controller; the sand level control mechanism comprises a first air blower communicated with the air chamber 23 and a level gauge arranged in the closed box 21, and the first air blower and the level gauge in the two sand level control mechanisms are electrically connected.
When the sand level in the upper closed box is higher than a preset value, the first controller receives a signal sent by a level gauge in the upper closed box, and the first controller controls a first air blower communicated with the upper sand feeding pipe air chamber 23 to work, and waste sand in the upper sand feeding pipe flows to the lower roasting layer 12. When the sand level in the upper closed box is lower than the specified height, the first controller receives signals sent by the level gauge in the upper closed box, and the first controller controls the corresponding first air blower to stop working.
When the sand level in the lower closed box is higher than a preset value, the first controller receives a signal sent by a level gauge in the lower closed box, and the first controller controls a first air blower communicated with the lower sand feeding pipe air chamber 23 to work, and waste sand in the lower sand feeding pipe flows to the outside. When the sand level in the lower closed box exceeds the specified height, the first controller receives a signal sent by the level gauge in the lower closed box, and the first controller controls the corresponding first air blower to stop working.
The air inlet unit comprises a main pipe 50 and a fan 40 communicated with the main pipe 50, and a plurality of air inlet branch pipes 51 are connected between the main pipe 50 and the bottom of the furnace body 10. The air intake unit may be configured such that the main pipe 50 is connected to the first blower without providing the blower 40, and the first blower supplies the main pipe 50 with the inflation gas.
Example 3
This embodiment differs from embodiment 1 in that: the waste sand roasting system further comprises a second controller and a second air blower, a pipeline (hereinafter referred to as a first pipeline) is connected between the second air blower and the air chamber 23 of the upper sand conveying pipe, a pipeline (hereinafter referred to as a second pipeline) is connected between the second air blower and the air chamber 23 of the lower sand conveying pipe, a first valve is arranged on the first pipeline, and a second valve is arranged on the second pipeline. The sand level control mechanism is a material level indicator arranged in the closed box 21, and the second controller is electrically connected with the first valve, the second valve and the material level indicators in the two sand level control mechanisms. The air inlet unit comprises a main pipe 50, a third pipeline is connected between the main pipe 50 and the second blower, and a plurality of air inlet branch pipes 51 are connected between the main pipe 50 and the bottom of the furnace body 10.
When the sand level in the upper closed box is higher than a preset value, the second controller receives a signal sent by a level gauge in the upper closed box, the second controller controls the first valve to be opened, and gas generated by the second air blower flows into the air chamber 23 of the upper sand conveying pipe through the first pipeline; and when the sand level in the upper closed box is lower than the specified height, the second controller receives a signal sent by the level gauge in the upper closed box, and the second controller controls the first valve to be closed.
When the sand level in the lower closed box is higher than a preset value, the second controller receives a signal sent by a level gauge in the lower closed box, the second controller controls a second valve to be opened, and gas generated by a second air blower flows into the air chamber 23 of the lower sand conveying pipe through a second pipeline; and when the sand level in the lower closed box is lower than the exceeding specified height, the second controller receives a signal sent by the level gauge in the lower closed box, and the first controller controls the second valve to be closed.
Claims (10)
1. The utility model provides a sand waste calcination system which characterized in that: the device comprises a drying tower, a furnace body and an air inlet unit communicated with the bottom of the furnace body, wherein the lower end of the drying tower is communicated with the upper part of the furnace body; an upper sealing plate for dividing the furnace body into an upper roasting layer and a lower roasting layer is arranged in the furnace body, and a plurality of longitudinally distributed communication channels are arranged on the upper sealing plate; the furnace body is provided with a burner communicated with the upper roasting layer; an upper sand conveying device is arranged on one side of the furnace body, which is far away from the drying tower, and a lower sand conveying device is arranged on the other side of the furnace body, and the upper sand conveying device and the lower sand conveying device both comprise a closed box, a sand level control mechanism for controlling sand in the closed box to be at a fixed height and a sand conveying pipe communicated with the lower end of the closed box; the upper end of the upper sand feeding device sealing box is communicated with the upper roasting layer, and a sand feeding pipe of the upper sand feeding device is communicated with the lower roasting layer; a lower sealing plate positioned below the upper sealing plate is arranged in the furnace body, and a plurality of connecting channels are also arranged on the lower sealing plate; the upper end of the lower sand feeding device sealing box is communicated with the lower roasting layer; the upper sealing plate and the lower sealing plate are provided with the same number of connecting channels, each connecting channel comprises an air pipe and a hood arranged at the upper part of the air pipe, and the side wall of the hood is provided with air holes; the number of the wind holes formed in the wind cap at the lower sealing plate is greater than that of the wind holes formed in the wind cap at the upper sealing plate; the bottom of the sand conveying pipe is provided with an air chamber, the upper wall of the air chamber is provided with a plurality of communication mechanisms, each communication mechanism comprises a cover cap and an inner pipe for communicating the sand conveying pipe with the air chamber, the cover cap is fixed on the upper wall of the air chamber and is covered on the inner pipe, and the side wall of the cover cap is provided with an air outlet far away from one side of the closed box; the gas flow section of the upper sealing plate connecting channel is smaller than that of the lower sealing plate connecting channel; the air outlet is positioned at the lower part of the side wall of the cover cap, and the upper end opening of the inner tube is positioned above the air outlet.
2. A sand waste firing system according to claim 1, wherein: the waste sand roasting system further comprises a first controller; the sand level control mechanism comprises a first air blower communicated with the air chamber and a level gauge arranged in the closed box, and the first controller is electrically connected with the first air blower and the level gauge.
3. A sand waste firing system according to claim 1, wherein: the waste sand roasting system also comprises a second controller and a second air blower, wherein the second air blower is respectively communicated with the two air chambers through pipelines, one pipeline is provided with a first valve, and the other pipeline is provided with a second valve; the sand level control mechanism is a material level indicator arranged in the closed box, and the second controller is electrically connected with the first valve, the second valve and the material level indicator.
4. A sand waste firing system according to claim 1, wherein: the sand level control mechanism comprises a third controller, a third air blower communicated with the air chamber and a level gauge arranged in the closed box, and the third controller is electrically connected with the third air blower and the level gauge.
5. A spent sand roasting system according to any one of claims 1-4, wherein: the air inlet unit comprises a main pipe, and a plurality of air inlet branch pipes are connected between the main pipe and the bottom of the furnace body.
6. A spent sand roasting system according to any one of claims 1-4, wherein: the upper portion of drying tower is connected with the inlet pipe, is equipped with multiunit dispersion portion along the direction of height in the drying tower, and dispersion portion includes the dispersion board of reverse V-arrangement and two symmetries set up and enclose into the collection material board of reverse splayed, and the collection material board is located the below of dispersion board.
7. A sand waste firing system as claimed in claim 6, wherein: the burner is fixed on the furnace body lateral wall far away from drying tower one side, and the nozzle of burner is towards last shrouding and forms 30-45 degrees contained angles with the furnace body lateral wall.
8. A sand waste firing system as claimed in claim 7, wherein: the bottom of the upper sealing plate is provided with a high-temperature steel plate; the inner wall of the furnace body is provided with a connecting groove, and the high-temperature steel plate is arranged in the furnace body through the connecting groove.
9. A sand waste firing system as claimed in claim 8, wherein: the lower end of the drying tower is communicated with the upper part of the furnace body through a corrugated pipe.
10. A spent sand roasting system according to any one of claims 1-4, wherein: the furnace body comprises a ceramic fiber cotton heat-insulating refractory layer.
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| CN201811361639.7A CN109434014B (en) | 2018-11-15 | 2018-11-15 | Waste sand roasting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109940125A (en) * | 2019-04-27 | 2019-06-28 | 共享智能铸造产业创新中心有限公司 | High production capacity sand thermal reclamation roaster |
| CN112846071B (en) * | 2020-12-31 | 2022-11-15 | 重庆长江造型材料（集团）股份有限公司 | Heat collection exchange method and mechanism of high-temperature kiln |
| CN112815696B (en) * | 2020-12-31 | 2022-12-27 | 重庆长江造型材料（集团）股份有限公司 | Forced air supply system of horizontal furnace |
| CN112833670B (en) * | 2020-12-31 | 2023-02-28 | 重庆长江造型材料（集团）股份有限公司 | In-furnace thermal regulation system of horizontal high-temperature kiln |
| CN112815709A (en) * | 2020-12-31 | 2021-05-18 | 重庆长江造型材料（集团）股份有限公司 | Fluidized roasting method |
| CN112833669B (en) * | 2020-12-31 | 2023-03-24 | 重庆长江造型材料（集团）股份有限公司 | High-efficiency energy-saving thermal cracking furnace |
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