CN115560601A - Online cleaning device for solid matters in waste gas of melting furnace - Google Patents

Abstract

The invention discloses an online cleaning device for solid matters in waste gas of a melting furnace, which comprises: and the top end of the flue air box is opened and communicated with the flue, the bottom end of the flue air box can be opened and closed, and the lower end of the flue air box is provided with a valve member for closing an inner channel at the lower end of the flue air box in the solid matter cleaning and discharging process. The side wall of the flue bellows is also communicated with a flue opening brick of the melting furnace, the side wall of the flue bellows is also communicated with a cold air flow supply device so as to introduce cold air flow to impact and cool high-temperature waste gas, and the mixed air flow of the cold air flow and the high-temperature waste gas rotates downwards along the flue bellows, so that solid matters in the high-temperature waste gas are condensed and separated out and fall downwards to the bottom end of the flue bellows, and clean waste gas moves upwards under the action of counterforce and is discharged into the flue from the top end opening of the flue bellows. The online cleaning device can solve the problem of furnace pressure change caused by the blockage of the flue of the glass melting furnace, can realize the online cleaning of solid matters, and has simple cleaning operation and safe and reliable operation.

Description

Online cleaning device for solid matters in waste gas of melting furnace

Technical Field

The invention relates to the field of melting furnace waste gas treatment devices, in particular to an online cleaning device for solid matters in waste gas of a melting furnace.

Background

In order to improve the melting efficiency of the electronic glass raw materials, the electronic glass melting furnace generally adopts a mode of simultaneously heating by electric heating and natural gas, so that the glass raw materials are fully melted and the feed liquid is clarified. The natural gas burning and the glass raw material melting all have high-temperature waste gas to produce, therefore the melting furnace need discharge a large amount of high-temperature waste gas in the production process, because the installation needs of equipment again, dust collecting equipment is usually tens meters away from the kiln, so this section distance needs the tobacco pipe to connect (be the flue).

Because the high-temperature waste gas contains a small amount of glass raw material powder and other vaporized solid substances, the solid substances can be solidified along with the reduction of the temperature of the waste gas to cause the blockage of a flue, and the blockage of the flue causes the change of the furnace pressure of the melting furnace, thereby influencing the quality of the produced product.

The existing method is to adopt a flue port for cooling, open a door or a flange structure on the flue port, and periodically open the flue door or take down the flange to clean the flue. The method ensures that the furnace pressure of the melting furnace is changed in the whole cleaning process, thereby influencing the quality of the produced products; meanwhile, because the single cleaning time is too long and the cleaning frequency is high (about 3-5 times per week), the product quality is unstable, the cleaning workload is large, the labor intensity of workers is high, and the cleaning is performed in a high-temperature environment, so that the cleaning difficulty of the operators is large, and the safety of the cleaning operation is low.

Disclosure of Invention

The invention provides an online cleaning device for solid matters in waste gas of a melting furnace, which solves the technical problems that the quality of produced products is affected by the pressure change of the melting furnace due to the easy blockage of a flue in the existing cleaning mode, the cleaning workload is large, the labor intensity of workers is high, and the cleaning difficulty of the operators is large and the cleaning operation safety is low when the operators clean the waste gas in a high-temperature environment.

The technical scheme adopted by the invention is as follows:

an online cleaning device for solid matters in waste gas of a melting furnace comprises: the device comprises a hollow cylindrical flue air box which is vertically arranged, wherein the top end of the flue air box is opened and is communicated with the flue in a sealing manner so as to discharge clean waste gas generated after solid substances are removed into the flue, the bottom end of the flue air box can be opened and closed and is used for containing the solidified falling solid substances and enabling the solid substances to be cleaned and discharged periodically, and a valve member is further arranged at the lower end of the flue air box and is used for closing an inner channel at the lower end of the flue air box in the solid substance cleaning and discharging process so as to ensure the normal operation of the online cleaning device; the side wall of the flue bellows is also communicated with a flue opening brick of the melting furnace in a sealing way so as to discharge high-temperature waste gas to be treated into the flue bellows, the side wall of the flue bellows is also communicated with a cold gas flow supply device for supplying cold gas flow so as to introduce the cold gas flow to impact and cool the high-temperature waste gas, and the mixed gas flow of the cold gas flow and the high-temperature waste gas rotates downwards along the flue bellows, so that solid substances in the high-temperature waste gas are condensed and separated out and fall downwards to the bottom end of the flue bellows, and clean waste gas moves upwards under the action of a reaction force and is discharged into the flue from the top end opening of the flue bellows.

Furthermore, the flue bellows comprises a hollow cylindrical flue outer cylinder with two communicated ends, a dust collecting barrel for collecting fallen solid matters, a flow guide inner pipe for rotating to guide the mixed airflow downwards and simultaneously guide clean waste gas upwards, and a cold air pipe for guiding cold airflow; the dust collecting barrel is communicated with the lower opening end of the outer flue barrel in a sealing way, the bottom end of the dust collecting barrel can be arranged in an opening and closing way, and the valve member is arranged at the lower end of the outer flue barrel and is close to the dust collecting barrel; the flow guide inner pipe is hermetically fixed in the upper opening end of the flue outer cylinder, the upper end of the flow guide inner pipe is communicated with the flue, and the opposite lower end of the flow guide inner pipe extends downwards into the flue outer cylinder along the axis; the side wall of the flue outer cylinder is also communicated with the flue opening brick in a sealing way, one end of the cold air pipe is communicated with the side wall of the flue outer cylinder, and the other opposite end of the cold air pipe is communicated with the cold air flow supply device.

Furthermore, the length of the flow guide inner pipe extending into the flue outer cylinder is 1/3-1/2 of the total length of the flue outer cylinder; the outer diameter of the flow guide inner pipe is 1/4-1/2 of the inner diameter of the flue outer cylinder.

Further, the cold air pipe comprises a tubular equal-diameter pipe and a flat square pipe, wherein the equal-diameter pipe is used for being connected with the cold air supply device; the square pipe is communicated with the side wall of the flue outer barrel in parallel so that cold air flow is sprayed into the flue outer barrel along the tangential direction of the inner peripheral surface of the flue outer barrel and vertical to high-temperature waste gas.

Furthermore, the online cleaning device for solid matters in the waste gas of the melting furnace also comprises a control device, wherein the control device comprises a controller, a flow regulating valve and a temperature detector which are connected with the controller; the flow regulating valve is connected in the pipeline of the cold air pipe; the temperature detector is connected in the upper end of water conservancy diversion inner tube to detect the temperature of clean waste gas, and then make the controller according to the aperture of the temperature value automatic control flow control valve of clean waste gas.

Furthermore, the valve component comprises a mounting box fixed on the outer peripheral surface of the flue outer cylinder and a valve plate used for sealing a channel in the flue outer cylinder; the outer side opening of the installation box is used for installing the valve plate in the installation box in a sliding manner through the outer side opening; the outer circular surface of the flue outer cylinder is provided with a mounting notch which is perpendicular to the inner circular surface and extends inwards corresponding to the valve plate, the mounting notch is communicated with the inner cavity of the mounting box, and the valve plate is used for being inserted into the mounting notch in a sliding mode under the action of external force so as to block an inner channel of the flue outer cylinder.

Furthermore, the valve component comprises a mounting box fixed on the outer peripheral surface of the flue outer barrel, a valve electric push rod arranged on the mounting box and a valve plate used for cutting off a channel in the flue outer barrel, and the valve electric push rod is connected with the controller; the outer side opening of the installation box is used for installing the valve plate in the installation box in a sliding manner; the outer circular surface of the flue outer cylinder is provided with a mounting notch which is concave and extends vertically to the outer circular surface corresponding to the valve plate, and the mounting notch is communicated with the inner cavity of the mounting box; the fixed end of the valve electric push rod is fixed with the mounting box, and the opposite driving end of the valve electric push rod is connected with the outer end of the valve plate.

Further, the dust collecting barrel comprises an upper barrel, a lower barrel and a barrel electric push rod, wherein the two ends of the upper barrel are communicated, the upper barrel is hollow and cylindrical, the bottom end of the lower barrel is closed, the upper end of the lower barrel is open, the lower barrel is hollow and cylindrical, the barrel electric push rod is used for driving the lower barrel to move, and the barrel electric push rod is connected with the controller; the upper opening end of the upper barrel is hermetically connected with the lower opening end of the flue outer barrel; the upper opening end of the lower barrel is hinged with the lower opening end of the upper barrel through a hinge piece; the barrel electric push rod is fixed on the peripheral surface of the upper barrel, and the driving end of the barrel electric push rod is connected with the lower barrel.

Furthermore, the on-line cleaning device for solid matters in the waste gas of the melting furnace also comprises a weighing unit connected with the control device; the weighing unit is arranged in the lower barrel and used for weighing the weight of the solid matters on line in real time, so that the controller automatically controls the action of the electric push rod of the valve and the electric push rod of the barrel according to the weight value of the solid matters.

Further, if the flow rate of the cold air flow is Q1, the temperature is T1, the flow rate of the high-temperature exhaust gas is Q2, the temperature is T2, and the flow rate of the clean exhaust gas is Q3, the temperature is T3, then: (Q1 + Q2) (T1 + T2) = Q3 \65121; T3+ kmt; wherein k is a correction coefficient, m is a solid matter weight, and t is the number of days of a cleaning cycle.

The invention has the following beneficial effects:

according to the online cleaning device for solid matters in the waste gas of the melting furnace, the solid particles are separated out from the high-temperature waste gas in the melting furnace at the flue opening through the special structure arrangement of the flue bellows and the action of power contained in the high-temperature waste gas and the cold air flow, and the clean waste gas without the solid matters after treatment is discharged through the flue, so that the problem that the quality of produced products is influenced due to the change of furnace pressure caused by the blockage of the flue of the glass melting furnace is solved; secondly, through the structural cooperation that valve member and flue bellows bottom can collect and open and shut the setting on the flue bellows, can accomplish the online clearance of the solid matter of collecting, in the solid matter clearance process, flue bellows lower extreme inner channel seals to ensure the stability of melting furnace internal pressure, avoid the product quality problem because pressure instability causes, when the solid matter clearance simultaneously, clearance work is accomplished the clearance by the controller is automatic, clearance easy operation, workman's low in labor strength, simultaneous operation safe and reliable.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic space structure of an on-line cleaning apparatus for solid matters in exhaust gas of a melting furnace according to a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the gas flow direction in the horizontal section of FIG. 1;

fig. 3 is a schematic view of the vertical section gas flow of fig. 1.

Description of the figures

10. A flue port brick; 20. a flue outer cylinder; 30. a dust collection barrel; 31. putting the barrel on; 32. discharging the barrel; 33. a barrel electric push rod; 40. a flow guiding inner pipe; 50. a cold air duct; 60. a valve member; 61. installing a box; 62. a valve electric push rod; 63. a valve plate; 71. a flow regulating valve; 72. a temperature detector; 80. and a weighing unit.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

Referring to fig. 1 to 3, a preferred embodiment of the present invention provides an on-line cleaning apparatus for solid matter in exhaust gas of a melting furnace, comprising: the flue bellows of vertical setting and cavity tube-shape, the top end opening of flue bellows and with the sealed intercommunication of flue to supply the clean waste gas after the solid matter is got rid of to discharge into the flue, the bottom of flue bellows can open and shut the setting, but make the solid matter of solid matter regular cleaning discharge with being used for the splendid attire to solidify the whereabouts, the lower extreme of flue bellows still is equipped with valve member 60, in order to be used for closing the interior passageway of flue bellows lower extreme at the outer in-process of solid matter clearance, guarantees online cleaning device normal operating. The side wall of the flue bellows is also communicated with a flue opening brick 10 of the melting furnace in a sealing way so as to discharge high-temperature waste gas to be treated into the flue bellows, the side wall of the flue bellows is also communicated with a cold gas flow supply device for supplying cold gas flow so as to introduce the cold gas flow to impact and cool the high-temperature waste gas, and the mixed gas flow of the cold gas flow and the high-temperature waste gas rotates downwards along the flue bellows, so that solid matters in the high-temperature waste gas are condensed and separated out and fall downwards to the bottom end of the flue bellows, and clean waste gas moves upwards under the action of a reaction force and is discharged into the flue from the top end opening of the flue bellows.

When the online cleaning device for solid matters in the waste gas of the melting furnace works, the air box of the flue is arranged onThe four through holes A, B, C and D shown in the figures 1-3 are arranged, high-temperature waste gas generated in the melting furnace firstly enters the flue bellows through the C hole, meanwhile, cold air flow supplied by the cold air flow supply device enters the flue bellows through the A hole, the cold air flow impacts and cools the high-temperature waste gas, and mixed air flow formed by mixing the high-temperature waste gas and the cold air flow moves downwards along the rotation of the flue bellows under the matching action of self power and the arrangement of the structure in the flue bellows; solid particles begin to be separated out after the high-temperature waste gas is cooled, and the separated solid particles are separated out under the centrifugal force F = mv ² Accumulating towards the inner wall of the flue bellows under the action of/r (m is the mass of solid particles, v is the velocity of the solid particles, and r is the centrifugal radius of fixed particles), falling downwards under the action of gravity G = mg, finally collecting the bottom end of the flue bellows, enabling clean waste gas without the solid substances to move upwards under the action of the reaction force of the inner wall of the flue bellows, discharging the clean waste gas into a flue through an opening B on the flue bellows, and finally discharging the waste gas through the flue, thereby realizing the cleaning of the solid substances in the high-temperature waste gas; when the solid matters contained in the flue bellows need to be cleaned, the valve member 60 is driven to act, so that the inner channel at the lower end of the flue bellows is closed, and then the bottom end of the flue bellows is opened to clean the solid matters.

According to the online cleaning device for solid matters in the waste gas of the melting furnace, the solid particles are separated out from the high-temperature waste gas in the melting furnace at the flue opening through the special structure arrangement of the flue bellows and the action of power contained in the high-temperature waste gas and the cold air flow, and the clean waste gas without the solid matters after treatment is discharged through the flue, so that the problem that the quality of produced products is influenced due to the change of furnace pressure caused by the blockage of the flue of the glass melting furnace is solved; secondly, the structure cooperation that sets up can be collected and open and shut through valve member 60 and flue bellows bottom on the flue bellows, can accomplish the online clearance of the solid matter of collecting, in the solid matter clearance process, flue bellows lower extreme inner channel seals, thereby ensure the stability of melting furnace internal pressure, avoid the product quality problem that causes because pressure is unstable, simultaneously in the solid matter clearance process, flue bellows lower extreme inner channel seals, so when clearance operating personnel opened flue bellows bottom and cleared up, clearance easy operation, the clearance volume is little, workman's low in labor strength, the simultaneous operation safe and reliable.

Alternatively, as shown in fig. 1 and 3, the flue bellows comprises a hollow cylindrical flue outer cylinder 20 with two communicated ends, a dust collecting barrel 30 for collecting the dropped solid matters, a diversion inner pipe 40 for guiding the mixed gas flow downwards in a rotating manner and guiding the clean waste gas upwards at the same time, and a cold air pipe 50 for guiding the cold air flow. The dust collecting barrel 30 is hermetically communicated with the lower opening end of the outer flue barrel 20, the bottom end of the dust collecting barrel 30 can be opened and closed, and the valve member 60 is arranged at the lower end of the outer flue barrel 20 and close to the dust collecting barrel 30. The inner diversion pipe 40 is hermetically fixed in the upper opening end of the outer flue cylinder 20, the upper end of the inner diversion pipe 40 is communicated with the flue, and the opposite lower end of the inner diversion pipe extends downwards into the outer flue cylinder 20 along the axis. The side wall of the flue outer cylinder 20 is also in sealed communication with the flue opening brick 10, one end of the cold air pipe 50 is communicated with the side wall of the flue outer cylinder 20, and the other opposite end is used for communicating with a cold air flow supply device. In this alternative, as shown in fig. 1 to 3, an opening a is formed at the input end of the inner flow guide pipe 40, an opening C is formed at the side wall of the outer flue pipe 20 and communicated with the flue opening brick 10, an opening B is formed at the lower end of the inner flow guide pipe 40, and an opening D is formed at the upper end of the inner flow guide pipe 40. When the melting furnace dust collecting device works, a C opening on a flue outer cylinder 20 is aligned with a flue opening brick 10 of the melting furnace and sealed, so that high-temperature waste gas in the melting furnace enters the flue outer cylinder 20 through the C opening, meanwhile, cold gas flow enters the flue outer cylinder 20 after passing through an A opening, the cold gas flow impacts the high-temperature waste gas, meanwhile, the cold gas flow forces mixed gas flow formed by mixing the cold gas flow and the high-temperature waste gas to rotate downwards along the inner peripheral surface of the flue outer cylinder 20 under the flow guide effect of a channel in a flow guide inner pipe 40 and a channel in the flue outer cylinder 20, solid particles begin to separate out after the high-temperature waste gas is cooled, the separated solid particles accumulate towards the inner wall of the flue outer cylinder 20 and begin to fall downwards under the gravity effect, finally, the dust is collected into a dust collecting barrel 30, clean waste gas is discharged upwards from a B opening under the effect of counter force and enters a flue, and the process ensures that the solid particles in the waste gas separate out is separated out, and the purpose of removing fixed particles in the waste gas is achieved.

In this alternative, as shown in fig. 3, the flue outer cylinder 20 has a circular cross section. Due to the circular structure of the section of the inner circumferential surface of the flue outer cylinder 20, the guide inner tube 40 is matched to guide the mixed airflow to rotate downwards, and meanwhile, the energy loss of the mixed airflow when the mixed airflow collides with the wall surface is reduced as much as possible, so that the mixed airflow rises under the action of counter force after reaching the bottom of the dust collecting barrel 30 as completely as possible, the precipitation rate of solid matters in high-temperature waste gas is improved, the waste gas is further purified, and the flue blockage is more effectively prevented.

In this alternative, as shown in fig. 3, the inventors found after a great deal of experiments that: the length that water conservancy diversion inner tube 40 stretched into in the flue urceolus 20 is relevant with the efficiency of getting rid of solid matter in the high temperature waste gas, for obtaining the high removal rate as high as possible of solid matter in the high temperature waste gas, the inventor of this application obtains after long-term exploration and test and the optimal design of very big volume: when the length that the diversion inner tube 40 stretched into the flue outer cylinder 20 was 1/3 ~ 1/2 of the total length of the flue outer cylinder 20, not only the mixed gas stream can all reach the bottom of dust collecting vessel 30 as far as possible to improve the clearance of solid matter, the work efficiency of device is high simultaneously, and mixed gas stream and clean waste gas are difficult for stopping in the device, can upwards discharge into in the flue as early as possible, thereby the device work efficiency is high, throughput is strong. Similarly, when the outer diameter of the inner diversion pipe 40 is 1/4-1/2 of the inner diameter of the outer flue cylinder 20, similar beneficial effects can be obtained, and the description is not repeated.

In this alternative, as shown in fig. 2 and 3, the cold air duct 50 includes a tube of equal diameter having a tubular shape for connecting to the cold air supply device, and a square tube having a flat shape for connecting to the tube of equal diameter. The square pipe is communicated with the side wall of the flue outer cylinder 20 in parallel, so that cold air flow is sprayed into the flue outer cylinder 20 along the tangential direction of the inner circumferential surface of the flue outer cylinder 20 and is perpendicular to the high-temperature waste gas, the high-temperature waste gas is cooled by impact, and meanwhile, the mixed air flow can form a rotational flow with the maximum initial power along the circumferential direction, and the precipitation rate of solid substances in the high-temperature waste gas is further improved.

Optionally, as shown in fig. 1, the online cleaning device for solid matters in the waste gas of the melting furnace further comprises a control device, wherein the control device comprises a controller, and a flow regulating valve 71 and a temperature detector 72 which are connected with the controller. Flow regulating valve 71 is connected in the line of cold air pipe 50. The temperature detector 72 is connected to the upper end of the flow guiding inner tube 40 to detect the temperature of the clean exhaust gas, so that the controller automatically controls the opening of the flow regulating valve 71 according to the temperature value of the clean exhaust gas. In this alternative, the flow rate adjustment valve 71 is an electric adjustment valve, and the temperature detector 72 is a temperature sensor. During operation, electrical control valve is used for adjusting the flow of cold gas flow, temperature sensor is used for detecting the exhaust temperature of clean waste gas, temperature sensor sends the temperature value that detects for the controller in real time, this real-time temperature value is received to the controller, if this real-time temperature value is greater than the system and predetermines the temperature, then the aperture increase of the corresponding control electrical control valve of controller, otherwise, the aperture of the corresponding control electrical control valve of controller reduces, thereby reach the temperature of the clean waste gas of automatic control, and then reduce the purpose of flue dust. If the scheme adopts 500 ℃ as the optimal exhaust gas discharge temperature (actually, in the application, after long-term exploration and a great amount of experiments and optimal design, the inventor obtains the optimal temperature range of 400-600 ℃, the solid matter removal rate in the high-temperature exhaust gas is highest, the energy loss is relatively low, and the cost is low), the initial temperature of the high-temperature exhaust gas discharged by the melting furnace is 1500-1600 ℃, the cooling air is 15-30 ℃, and the controller automatically adjusts the flow of the cold air flow by controlling the opening of the electric adjusting valve to achieve the aim of automatically controlling the temperature of the clean exhaust gas and further reducing the flue dust.

Alternatively, in the first embodiment of the valve member 60, not shown, the valve member 60 includes a mounting box 61 fixed to the outer peripheral surface of the flue outer cylinder 20, and a valve plate 63 for closing the passage in the flue outer cylinder 20. The mounting case 61 is opened on the outside, and the valve plate 63 is slidably mounted in the mounting case 61 through the opening on the outside. The outer circular surface of the flue outer cylinder 20 is provided with a mounting notch which is perpendicular to the inner circular surface and extends inwards corresponding to the valve plate 63, the mounting notch is communicated with the inner cavity of the mounting box 61, and the valve plate 63 is used for being inserted into the mounting notch in a sliding manner under the action of external force so as to block an inner channel of the flue outer cylinder 20. When the flue outer barrel 20 works normally, the valve plate 63 is partially positioned in the inner cavity of the mounting box 61, the rest part of the valve plate is positioned outside the mounting box 61, and the mixed airflow in the flue outer barrel 20 is prevented from leaking outwards through a gap between the valve plate 63 and the inner cavity of the mounting box 61 after passing through the mounting groove opening through the matching arrangement of the valve plate 63 and the inner cavity of the mounting box 61; when solid matters in the dust collecting barrel 30 need to be cleaned, a cleaning operator applies force to push the valve plate 63, so that the valve plate 63 is inserted into the mounting notch in a sliding manner and continues to push the valve plate 63 into the mounting notch, and the valve plate 63 transversely cuts off an inner channel of the flue outer barrel 20, so that the solid matters can be cleaned on line.

Alternatively, in a second embodiment of the valve member 60, as shown in fig. 1, the valve member 60 includes a mounting box 61 fixed on the outer peripheral surface of the flue outer cylinder 20, a valve electric push rod 62 disposed on the mounting box 61, and a valve plate 63 for blocking the passage in the flue outer cylinder 20, and the valve electric push rod 62 is connected to the controller. The mounting case 61 is opened on the outside, and the valve plate 63 is slidably mounted in the mounting case 61 through the opening on the outside. The outer circular surface of the flue outer cylinder 20 is provided with a mounting notch which is perpendicular to the inner circular surface and extends inwards corresponding to the valve plate 63, and the mounting notch is communicated with the inner cavity of the mounting box 61. The fixed end of valve electric push rod 62 is fixed with mounting box 61, and its relative drive end connects the outer end of valve plate 63. When the flue outer barrel 20 works normally, the valve plate 63 is partially positioned in the inner cavity of the mounting box 61, the rest part of the valve plate is positioned outside the mounting box 61, and the mixed airflow in the flue outer barrel 20 is prevented from leaking outwards through a gap between the valve plate 63 and the inner cavity of the mounting box 61 after passing through the mounting groove opening through the matching arrangement of the valve plate 63 and the inner cavity of the mounting box 61; when solid matters in the dust collecting barrel 30 need to be cleaned, the valve electric push rod 62 is started to pull and push the valve plate 63, so that the valve plate 63 is inserted into the mounting notch in a sliding mode and in the pulling process, the valve plate 63 transversely cuts off an inner channel of the flue outer barrel 20, and therefore the solid matters can be cleaned on line. Preferably, the valve plate 63 is further provided with a position sensor for detecting whether the inner channel of the flue outer cylinder 20 is closed in place, and the position sensor is connected with the controller.

Alternatively, as shown in fig. 1, the dust collecting barrel 30 includes an upper barrel 31 with two communicated ends and a hollow barrel shape, a lower barrel 32 with a closed bottom end and an open top end and a hollow barrel shape, and a barrel electric push rod 33 for driving the lower barrel 32 to move, wherein the barrel electric push rod 33 is connected with the controller. The upper opening end of the upper barrel 31 is hermetically connected with the lower opening end of the flue outer barrel 20. The upper open end of the lower barrel 32 is hinged with the lower open end of the upper barrel 31 through a hinge. The tub electric push rod 33 is fixed to an outer circumferential surface of the upper tub 31, and a driving end thereof is connected to the lower tub 32. In the alternative, as shown in fig. 1, the upper barrel 31 is detachably connected with the flue outer barrel 20, so that the solid matter can be conveniently and integrally removed and cleaned, the cleaning operation difficulty and the labor intensity of workers are reduced, and the operation is safe and reliable. When solid materials need to be cleaned, the bucket electric push rod 33 extends outwards to tilt the lower bucket 32 around a hinge point hinged with the upper bucket 31, solid particles in the bucket are poured out, and after the solid particles are cleaned, the bucket electric push rod 33 retracts to enable the lower bucket 32 and the upper bucket 31 to be connected in a sealing mode.

Optionally, as shown in fig. 1, the on-line cleaning device for solid matter in the exhaust gas of the melting furnace further comprises a weighing unit 80 connected to the control device. The weighing unit 80 is disposed in the lower barrel 32 for weighing the solid matter online in real time, so that the controller automatically controls the actions of the electric push rod 62 and the barrel electric push rod 33 according to the weight value of the solid matter. During actual setting, the weighing unit 80 sends a weighing value to the controller in real time, the controller acquires the weighing value sent by the weighing unit 80, when the weighing value is equal to a system set value, the controller drives the valve electric push rod 62 to act to close the valve member 60, meanwhile, the controller also acquires the state of the valve member 60 through a position sensor arranged on the valve plate 63, and if the valve member is completely closed, the controller drives the barrel electric push rod 33 to open the lower barrel 32 to dump solid particles; when the weighing value is 0, the controller drives the barrel electric push rod 33 to retract, and then drives the valve electric push rod 62 to open the flue outer barrel 20.

During operation, the valve member 60 is always in an open state, the flue outer cylinder 20 and the dust collecting barrel 30 form a seal, fixed particles directly fall into the dust collecting barrel 30, when the weighing unit 80 reaches a set weight, the controller controls the valve electric push rod 62 to work to close the valve member 60, after the position sensor arranged on the valve plate 63 detects that the inner channel of the flue outer cylinder 20 is completely closed, the controller controls the barrel electric push rod 33 to work to dump the lower barrel 32, solid particles in the barrel are dumped out, after the solid particles are cleaned, the barrel electric push rod 33 retracts to seal the bottom end of the flue bellows, and then the controller controls the valve electric push rod 62 to open the valve member 60. Since the flue outer tub 20 is in a sealed state when the valve member 60 is closed, the pressure of the melting furnace does not change during operation.

Compared with the existing cleaning method, the scheme of the invention reduces the difficulty of cleaning the flue, automatically controls the whole process, does not need manual cleaning, is simple and convenient to operate, greatly improves the cleaning efficiency while reducing the operation difficulty, simultaneously reduces the labor cost, completes each process in a sealing way, ensures the stability of the furnace pressure and ensures the stability of the product quality, and after the waste gas is treated by the flue bellows, the flue is not easy to block due to very small solid matter content.

Alternatively, in order to obtain the relationship between the number of days of the cleaning cycle and the weight of the solid matter, etc., the inventor of the present application obtains, after long-term exploration and extensive experimental verification: if the flow rate of the cold air flow is Q1, the temperature is T1, the flow rate of the high-temperature exhaust gas is Q2, the temperature is T2, the flow rate of the clean exhaust gas is Q3, and the temperature is T3, then:

Q1+Q2T1+T2＝Q3﹡T3+kmt。

wherein k is a correction coefficient, m is a solid matter weight, and t is the number of days of a cleaning cycle.

According to the formula, the number of days T of the cleaning cycle can be deduced, and whether the T2 set value is reasonable or not can be inversely calculated, so that closed-loop control is formed on flue control, and the removal rate and the removal efficiency of solid matters in high-temperature waste gas are improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An online cleaning device for solid matters in waste gas of a melting furnace is characterized by comprising:

the device comprises a hollow cylindrical flue air box which is vertically arranged, wherein the top end of the flue air box is opened and is communicated with the flue in a sealing manner so as to discharge clean waste gas generated after solid substances are removed into the flue, the bottom end of the flue air box can be opened and closed and is used for containing the solidified falling solid substances and enabling the solid substances to be cleaned and discharged periodically, and a valve member (60) is further arranged at the lower end of the flue air box and is used for closing an inner channel at the lower end of the flue air box in the solid substance cleaning and discharging process so as to ensure the normal operation of the online cleaning device;

the side wall of the flue air box is also communicated with a flue opening brick (10) of the melting furnace in a sealing way so as to discharge high-temperature waste gas to be treated into the flue air box, the side wall of the flue air box is also communicated with a cold air flow supply device for supplying cold air flow so as to introduce the cold air flow to impact and cool the high-temperature waste gas, and the mixed air flow of the cold air flow and the high-temperature waste gas rotates downwards along the flue air box, so that solid matters in the high-temperature waste gas are condensed and separated out and fall downwards to the bottom end of the flue air box, and clean waste gas moves upwards under the action of reaction force and is discharged into the flue from the top end opening of the flue air box.

2. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 1,

the flue air box comprises a hollow cylindrical flue outer cylinder (20) with two communicated ends, a dust collecting barrel (30) for collecting falling solid matters, a flow guide inner pipe (40) for guiding mixed airflow downwards in a rotating mode and guiding clean waste gas upwards at the same time, and a cold air pipe (50) for guiding cold airflow;

the dust collecting barrel (30) is communicated with the lower opening end of the flue outer barrel (20) in a sealing mode, the bottom end of the dust collecting barrel (30) can be arranged in an opening and closing mode, and the valve component (60) is arranged at the lower end of the flue outer barrel (20) and close to the dust collecting barrel (30);

the flow guide inner pipe (40) is hermetically fixed in the upper opening end of the flue outer barrel (20), the upper end of the flow guide inner pipe (40) is communicated with the flue, and the opposite lower end of the flow guide inner pipe (40) extends downwards into the flue outer barrel (20) along the axis;

the side wall of the flue outer cylinder (20) is also communicated with the flue opening brick (10) in a sealing way, one end of the cold air pipe (50) is communicated with the side wall of the flue outer cylinder (20), and the other opposite end of the cold air pipe is used for being communicated with the cold air supply device.

3. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 2,

the length of the diversion inner pipe (40) extending into the flue outer cylinder (20) is 1/3-1/2 of the total length of the flue outer cylinder (20);

the outer diameter of the flow guide inner pipe (40) is 1/4-1/2 of the inner diameter of the flue outer cylinder (20).

4. The on-line cleaning apparatus for solid matter in exhaust gas from a melting furnace according to claim 2,

the cold air pipe (50) comprises a tubular equal-diameter pipe and a flat square pipe, wherein the equal-diameter pipe is connected with the cold air supply device;

the square pipe is communicated with the side wall of the flue outer cylinder (20) in parallel so that cold air flow is sprayed into the flue outer cylinder (20) along the tangential direction of the inner circumferential surface of the flue outer cylinder (20) and vertical to high-temperature waste gas.

5. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 2,

the on-line cleaning device for solid matters in the waste gas of the melting furnace also comprises a control device, wherein the control device comprises a controller, a flow regulating valve (71) and a temperature detector (72) which are connected with the controller;

the flow regulating valve (71) is connected in the pipeline of the cold air pipe (50);

the temperature detector (72) is connected to the upper end of the flow guide inner pipe (40) to detect the temperature of the clean waste gas, and then the controller automatically controls the opening degree of the flow regulating valve (71) according to the temperature value of the clean waste gas.

6. The on-line cleaning apparatus for solid matter in exhaust gas from a melting furnace according to claim 5,

the valve component (60) comprises a mounting box (61) fixed on the outer peripheral surface of the flue outer cylinder (20) and a valve plate (63) used for sealing the channel in the flue outer cylinder (20);

the outer side opening of the installation box (61) is formed, and the valve plate (63) is arranged in the installation box (61) in a sliding mode through the outer side opening;

the outer circular surface of the flue outer cylinder (20) is provided with a mounting notch which is perpendicular to the inner circular surface and extends inwards corresponding to the valve plate (63), the mounting notch is communicated with the inner cavity of the mounting box (61), and the valve plate (63) is used for being inserted into the mounting notch in a sliding mode under the action of external force so as to partition an inner channel of the flue outer cylinder (20).

7. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 5,

the valve component (60) comprises a mounting box (61) fixed on the outer peripheral surface of the flue outer cylinder (20), a valve electric push rod (62) arranged on the mounting box (61), and a valve plate (63) used for cutting off a channel in the flue outer cylinder (20), wherein the valve electric push rod (62) is connected with the controller;

the outer side opening of the installation box (61) is formed, and the valve plate (63) is arranged in the installation box (61) in a sliding mode through the outer side opening;

the outer circular surface of the flue outer cylinder (20) is provided with a mounting notch which is concave and extends vertically to the outer circular surface corresponding to the valve plate (63), and the mounting notch is communicated with the inner cavity of the mounting box (61);

the fixed end of the valve electric push rod (62) is fixed with the mounting box (61), and the opposite driving end of the valve electric push rod is connected with the outer end of the valve plate (63).

8. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 7,

the dust collecting barrel (30) comprises an upper barrel (31) with two communicated ends and a hollow barrel shape, a lower barrel (32) with a closed bottom end and an open upper end and a hollow barrel shape, and a barrel electric push rod (33) for driving the lower barrel (32) to act, wherein the barrel electric push rod (33) is connected with the controller;

the upper opening end of the upper barrel (31) is hermetically connected with the lower opening end of the flue outer barrel (20);

the upper opening end of the lower barrel (32) is hinged with the lower opening end of the upper barrel (31) through a hinge piece;

the barrel electric push rod (33) is fixed on the peripheral surface of the upper barrel (31), and the driving end of the barrel electric push rod is connected with the lower barrel (32).

9. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 8,

the on-line cleaning device for solid matters in the waste gas of the melting furnace also comprises a weighing unit (80) connected with the control device;

the weighing unit (80) is arranged in the lower barrel (32) and is used for weighing the weight of the solid matters on line in real time, so that the controller automatically controls the actions of the electric push rod (62) and the barrel electric push rod (33) according to the weight values of the solid matters.

10. The apparatus for on-line cleaning of solid matter in off-gas of a melting furnace according to claim 9,

let cold air flow be Q1, the temperature be T1, high temperature exhaust gas flow be Q2, the temperature be T2, clean exhaust gas flow be Q3, the temperature be T3, then:

(Q1+Q2)(T1+T2)＝Q3﹡T3+kmt；

wherein k is a correction coefficient, m is a solid matter weight, and t is the number of days of a cleaning cycle.

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