On-line cleaning device for solid matter in melting furnace exhaust gas

Abstract

The present invention discloses an online cleaning device for solid matter in the exhaust gas of a melting furnace, comprising: a flue bellows, the top of which is open and connected to the flue, the bottom of which can be opened and closed, and the lower end of which is provided with a valve member for closing the inner channel at the lower end of the flue bellows during the solid matter cleaning and discharge process. The side wall of the flue bellows is also connected to the flue opening brick of the melting furnace, and the side wall of the flue bellows is also connected to a cold air flow supply device to introduce a cold air flow to impact and cool the high-temperature exhaust gas, and to rotate the mixed air flow of the cold air flow and the high-temperature exhaust gas downward along the flue bellows, thereby causing the solid matter in the high-temperature exhaust gas to condense and precipitate and fall downward to the bottom end of the flue bellows, while the clean exhaust gas moves upward under the action of the reaction force and is discharged into the flue from the top opening of the flue bellows. The online cleaning device of the present invention can solve the problem of furnace pressure change caused by the blockage of the flue of a glass melting furnace, and can realize the online cleaning of solid matter, and the cleaning operation is simple, safe and reliable.

Description

Technical Field

[0001] The invention relates to the field of melting furnace waste gas treatment devices, in particular to an online cleaning device for solid matter in melting furnace waste gas. Background Art

[0002] In order to improve the melting efficiency of electronic glass raw materials, electronic glass melting furnaces usually use electric heating and natural gas heating at the same time to fully melt the glass raw materials and clarify the liquid. Both natural gas combustion and glass raw material melting produce high-temperature exhaust gas, so during the production process, the melting furnace needs to discharge a large amount of high-temperature exhaust gas. Due to the installation requirements of the equipment, the dust removal equipment is usually tens of meters away from the kiln, so this distance requires a smoke pipe connection (i.e., flue).

[0003] Since the high-temperature exhaust gas contains a small amount of glass raw material powder and other vaporized solid substances, these solid substances will solidify as the exhaust gas temperature drops, causing flue blockage. Flue blockage causes the furnace pressure of the melting furnace to change, thereby affecting the quality of production products.

[0004] The existing method is to use the flue opening for cooling, open a door or flange structure on the flue opening, and regularly open the flue door or remove the flange to clean the flue. This method causes the furnace pressure of the melting furnace to change during the entire cleaning process, which in turn affects the quality of the product. At the same time, due to the long cleaning time and high cleaning frequency (about 3-5 times a week), the product quality is unstable. At the same time, the cleaning workload is large, the labor intensity of the workers is high, and the cleaning is carried out in a high temperature environment, which makes it difficult for the operators to clean, and the cleaning operation safety is low. Summary of the invention

[0005] The present invention provides an online cleaning device for solid matter in the exhaust gas of a melting furnace to solve the technical problems existing in the existing cleaning method, such as the flue is easily blocked, which leads to the change of the furnace pressure of the melting furnace affecting the quality of the production products, the cleaning workload is large, the labor intensity of the workers is high, and when cleaning in a high temperature environment, the cleaning is difficult for the operators and the cleaning operation safety is low.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An online cleaning device for solid matter in the exhaust gas of a melting furnace comprises: a vertically arranged hollow cylindrical flue bellows, the top of which is open and sealedly connected to the flue, so that clean exhaust gas after solid matter removal is discharged into the flue, the bottom of the flue bellows can be opened and closed to contain solidified and falling solid matter so that the solid matter can be cleaned and discharged regularly, and a valve member is also provided at the lower end of the flue bellows to close the inner channel at the lower end of the flue bellows during the solid matter cleaning and discharge process, so as to ensure the normal operation of the online cleaning device The side wall of the flue bellows is also sealed and connected with the flue opening bricks of the melting furnace so that the high-temperature exhaust gas to be treated can be discharged into the flue bellows. The side wall of the flue bellows is also connected with a cold air flow supply device for supplying a cold air flow, so as to introduce a cold air flow to impact and cool the high-temperature exhaust gas, and make the mixed air flow of the cold air flow and the high-temperature exhaust gas rotate downward along the flue bellows, thereby causing the solid matter in the high-temperature exhaust gas to condense and precipitate and fall downward to the bottom end of the flue bellows, while the clean exhaust gas moves upward under the action of the reaction force and is discharged into the flue through the top opening of the flue bellows.

[0008] Furthermore, the flue bellows includes a flue outer tube with both ends connected and in a hollow cylindrical shape, a dust collecting barrel for collecting fallen solid matter, a guide inner tube for rotating and guiding the mixed air flow downward and guiding the clean exhaust gas upward, and a cold air pipe for introducing a cold air flow; the dust collecting barrel is sealed and connected to the lower open end of the flue outer tube, and the bottom end of the dust collecting barrel can be opened and closed, and the valve member is arranged at the lower end of the flue outer tube and close to the dust collecting barrel; the guide inner tube is sealed and fixed in the upper open end of the flue outer tube, and the upper end of the guide inner tube is connected to the flue, and the opposite lower end thereof extends downward into the flue outer tube along the axis; the side wall of the flue outer tube is also sealed and connected to the flue mouth brick, and one end of the cold air pipe is connected to the side wall of the flue outer tube, and the other opposite end thereof is used to connect to the cold air flow supply device.

[0009] Furthermore, the length of the guide inner tube extending into the flue outer tube is 1 / 3 to 1 / 2 of the total length of the flue outer tube; the outer diameter of the guide inner tube is 1 / 4 to 1 / 2 of the inner diameter of the flue outer tube.

[0010] Furthermore, the cold air pipe includes a tubular equal-diameter tube connected to the cold air flow supply device, and a flat square tube connected to the equal-diameter tube; the square tube is parallel to the side wall of the flue outer tube so that the cold air flow can be sprayed into the flue outer tube along the tangent direction of the inner circumference of the flue outer tube and perpendicular to the high-temperature exhaust gas.

[0011] Furthermore, the online cleaning device for solid matter in the melting furnace exhaust gas also includes a control device, which includes a controller, and a flow regulating valve and a temperature detector connected to the controller; the flow regulating valve is connected to the pipeline of the cold air pipe; the temperature detector is connected to the upper end of the guide inner pipe to detect the temperature of the clean exhaust gas, so that the controller automatically controls the opening of the flow regulating valve according to the temperature value of the clean exhaust gas.

[0012] Furthermore, the valve component includes an installation box fixed on the outer circumferential surface of the flue outer tube, and a valve plate for closing the inner channel of the flue outer tube; the installation box has an outer opening, and the valve plate is slidably installed in the installation box through the outer opening; the outer circumferential surface of the flue outer tube is provided with an installation groove corresponding to the valve plate, which extends vertically inwardly from the outer circumferential surface, and the installation groove is connected to the inner cavity of the installation box, and the valve plate is used to slide into the installation groove under the action of external force to block the inner channel of the flue outer tube.

[0013] Furthermore, the valve component includes an installation box fixed on the outer circumferential surface of the flue outer tube, a valve electric push rod arranged on the installation box, and a valve plate for blocking the inner channel of the flue outer tube, and the valve electric push rod is connected to the controller; the installation box has an outer opening, and the valve plate is slidably installed in the installation box through the outer opening; an installation groove extending vertically inwardly from the outer circular surface is provided on the outer circular surface of the flue outer tube corresponding to the valve plate, and the installation groove is connected to the inner cavity of the installation box; the fixed end of the valve electric push rod is fixed to the installation box, and its opposite driving end is connected to the outer end of the valve plate.

[0014] Furthermore, the dust collection barrel includes an upper barrel with both ends connected and in a hollow cylindrical shape, a lower barrel with a closed bottom end and an open upper end and in a hollow cylindrical shape, and a barrel electric push rod for driving the lower barrel to move, and the barrel electric push rod is connected to a controller; the upper open end of the upper barrel is sealed and connected to the lower open end of the flue outer barrel; the upper open end of the lower barrel is hinged to the lower open end of the upper barrel by a hinge; the barrel electric push rod is fixed to the outer circumferential surface of the upper barrel, and its driving end is connected to the lower barrel.

[0015] Furthermore, the online cleaning device for solid matter in the melting furnace exhaust gas also includes a weighing unit connected to the control device; the weighing unit is arranged in the lower barrel to be used for online real-time weighing of the solid matter, so that the controller automatically controls the movement of the valve electric push rod and the barrel electric push rod according to the weight value of the solid matter.

[0016] Furthermore, assuming that the cold air flow rate is Q1 and the temperature is T1, the high-temperature exhaust gas flow rate is Q2 and the temperature is T2, and the clean exhaust gas flow rate is Q3 and the temperature is T3, then: (Q1+Q2)(T1+T2)=Q3﹡T3+kmt; where k is the correction coefficient, m is the weight of the solid matter, and t is the number of days of the cleaning cycle.

[0017] The present invention has the following beneficial effects:

[0018] The on-line cleaning device for solid matter in the exhaust gas of the melting furnace of the present invention is arranged through the special structure of the flue bellows, and cooperates with the dynamic action contained in the high-temperature exhaust gas and the cold air flow to perform solid particle precipitation treatment on the high-temperature exhaust gas in the melting furnace at the flue port, and the clean exhaust gas without solid matter after treatment is discharged through the flue, thereby solving the problem that the flue of the glass melting furnace is blocked and causes the furnace pressure to change, thereby affecting the quality of the production products; secondly, through the valve component on the flue bellows and the structure that can be collected and opened and closed at the bottom of the flue bellows, the collected solid matter can be cleaned online, and during the cleaning process of the solid matter, the inner channel at the lower end of the flue bellows is closed, thereby ensuring the stability of the pressure in the melting furnace and avoiding product quality problems caused by unstable pressure. At the same time, when the solid matter is cleaned, the cleaning work is automatically completed by the controller, and the cleaning operation is simple, the labor intensity of the workers is low, and the operation is safe and reliable.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the spatial structure of an online cleaning device for solid matter in the exhaust gas of a melting furnace according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of gas flow in horizontal section;

[0023] Figure 3 yes Figure 1 Schematic diagram of gas flow in a vertical section.

[0024] Legend

[0025] 10. Flue outlet brick; 20. Flue outer tube; 30. Dust collection barrel; 31. Upper barrel; 32. Lower barrel; 33. Barrel electric push rod; 40. Inner guide tube; 50. Cold air pipe; 60. Valve component; 61. Installation box; 62. Valve electric push rod; 63. Valve plate; 71. Flow control valve; 72. Temperature detector; 80. Weighing unit. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] Reference Figure 1-Figure 3The preferred embodiment of the present invention provides an online cleaning device for solid matter in the exhaust gas of a melting furnace, comprising: a vertically arranged and hollow cylindrical flue bellows, the top end of the flue bellows is open and sealedly connected with the flue, so that clean exhaust gas after the solid matter is removed can be discharged into the flue, the bottom end of the flue bellows can be opened and closed to contain the solidified and fallen solid matter and to allow the solid matter to be cleaned and discharged regularly, and the lower end of the flue bellows is also provided with a valve member 60, which is used to close the inner channel at the lower end of the flue bellows during the solid matter cleaning and discharge process to ensure the normal operation of the online cleaning device. The side wall of the flue bellows is also sealed and connected to the flue opening brick 10 of the melting furnace so that the high-temperature exhaust gas to be treated can be discharged into the flue bellows. The side wall of the flue bellows is also connected to a cold air flow supply device for supplying a cold air flow, so as to introduce a cold air flow to impact and cool the high-temperature exhaust gas, and make the mixed air flow of the cold air flow and the high-temperature exhaust gas rotate downward along the flue bellows, thereby causing the solid matter in the high-temperature exhaust gas to condense and precipitate and fall downward to the bottom end of the flue bellows, while the clean exhaust gas moves upward under the action of the reaction force and is discharged into the flue through the top opening of the flue bellows.

[0028] When the on-line cleaning device for solid matter in the exhaust gas of a melting furnace of the present invention is in operation, the flue wind box is provided with the following Figure 1-3 As shown in the figure, the high-temperature exhaust gas generated in the melting furnace first enters the flue wind box through the C port, and at the same time, the cold air flow supplied by the cold air flow supply device enters the flue wind box through the A port. The cold air flow impacts and cools the high-temperature exhaust gas, and the mixed air flow formed by the high-temperature exhaust gas and the cold air flow rotates and moves downward along the flue wind box under the cooperation of its own power and the structural setting in the flue wind box; after the high-temperature exhaust gas is cooled, solid particles begin to precipitate, and the precipitated solid particles are under the centrifugal force F=mv 2 / r (m is the mass of the solid particles, v is the velocity of the solid particles, and r is the centrifugal radius of the fixed particles), they accumulate on the inner wall of the flue bellows, and begin to fall downward under the action of gravity G=mg, and are finally collected in the bottom end of the flue bellows, while the clean exhaust gas with the solid matter removed moves upward under the reaction force of the inner wall of the flue bellows, and is discharged into the flue through the B port on the flue bellows, and finally the exhaust gas is discharged through the flue, thereby realizing the cleaning of the solid matter in the high-temperature exhaust gas; when it is necessary to clean the solid matter contained in the flue bellows, the valve member 60 is driven to close the inner channel at the lower end of the flue bellows, and then the bottom end of the flue bellows is opened to clean the solid matter.

[0029] The on-line cleaning device for solid matter in the exhaust gas of the melting furnace of the present invention is arranged through the special structure of the flue bellows, and cooperates with the dynamic action contained in the high-temperature exhaust gas and the cold air flow to perform solid particle precipitation treatment on the high-temperature exhaust gas in the melting furnace at the flue port, and the clean exhaust gas without solid matter after treatment is discharged through the flue, thereby solving the problem that the flue of the glass melting furnace is blocked and causes the furnace pressure to change, thereby affecting the quality of the production products; secondly, through the valve component 60 on the flue bellows and the structure that can be collected and opened and closed at the bottom of the flue bellows, the collected solid matter can be cleaned online, and during the cleaning process of the solid matter, the inner channel at the lower end of the flue bellows is closed, thereby ensuring the stability of the pressure in the melting furnace and avoiding product quality problems caused by unstable pressure, and at the same time, during the cleaning process of the solid matter, the inner channel at the lower end of the flue bellows is closed, so when the cleaning operator opens the bottom end of the flue bellows for cleaning, the cleaning operation is simple, the cleaning amount is small, the labor intensity of the workers is low, and the operation is safe and reliable.

[0030] Alternatively, if Figure 1 and Figure 3 As shown, the flue wind box includes a flue outer tube 20 with two ends connected and in a hollow cylindrical shape, a dust collection barrel 30 for collecting fallen solid matter, a guide inner tube 40 for rotating and guiding the mixed air flow downward while guiding the clean exhaust gas upward, and a cold air pipe 50 for introducing a cold air flow. The dust collection barrel 30 is sealed and connected to the lower open end of the flue outer tube 20, and the bottom end of the dust collection barrel 30 can be opened and closed, and the valve member 60 is arranged at the lower end of the flue outer tube 20 and close to the dust collection barrel 30. The guide inner tube 40 is sealed and fixed in the upper open end of the flue outer tube 20, and the upper end of the guide inner tube 40 is connected to the flue, and the opposite lower end thereof extends downward into the flue outer tube 20 along the axis. The side wall of the flue outer tube 20 is also sealed and connected to the flue opening brick 10, and one end of the cold air pipe 50 is connected to the side wall of the flue outer tube 20, and the other opposite end thereof is used to connect to the cold air flow supply device. In this optional scheme, as Figure 1-3As shown, the input end of the guide inner tube 40 forms an A port, the port opened on the side wall of the flue outer tube 20 and connected to the flue opening brick 10 forms a C port, the lower end of the guide inner tube 40 forms a B port, and the upper end of the guide inner tube 40 forms a D port. During operation, the C port on the flue outer tube 20 is aligned and sealed with the flue port brick 10 of the melting furnace, so that the high-temperature exhaust gas in the melting furnace enters the flue outer tube 20 through the C port, and at the same time, the cold airflow enters the flue outer tube 20 after passing through the A port. The cold airflow impacts the high-temperature exhaust gas. At the same time, the cold airflow forces the mixed airflow formed by the cold airflow and the high-temperature exhaust gas to rotate downward along the inner circumference of the flue outer tube 20 under the guidance of the guide inner tube 40 and the inner channel of the flue outer tube 20. After the high-temperature exhaust gas is cooled, solid particles begin to precipitate, and the precipitated solid particles accumulate on the inner wall of the flue outer tube 20, and begin to fall downward under the action of gravity, and are finally collected in the dust collection barrel 30, while the clean exhaust gas is discharged upward from the B port into the flue under the action of the reaction force. This process ensures the precipitation of solid particles in the exhaust gas, so as to achieve the purpose of removing fixed particles in the exhaust gas.

[0031] In this option, if Figure 3 As shown, the cross section of the flue outer tube 20 is circular. Due to the circular structure of the cross section of the inner circumference of the flue outer tube 20, the mixed airflow is guided to rotate downward in cooperation with the guide inner tube 40, while minimizing the energy loss when the mixed airflow collides with the wall surface, so that the mixed airflow reaches the bottom of the dust collection barrel 30 as much as possible and then rises under the action of the reaction force, thereby increasing the precipitation rate of solid matter in the high-temperature exhaust gas, further purifying the clean exhaust gas, and more effectively preventing the flue from being blocked.

[0032] In this option, if Figure 3 As shown, after a large number of experiments, the inventor found that the length of the inner guide tube 40 extending into the flue outer tube 20 is related to the removal efficiency of solid matter in the high-temperature exhaust gas. In order to obtain the highest possible removal rate of solid matter in the high-temperature exhaust gas, the inventor of the present application has obtained after long-term exploration and a large number of experiments and optimized designs that when the length of the inner guide tube 40 extending into the flue outer tube 20 is 1 / 3 to 1 / 2 of the total length of the flue outer tube 20, not only can the mixed airflow reach the bottom of the dust collection barrel 30 as much as possible to improve the removal rate of solid matter, but also the working efficiency of the device is high, and the mixed airflow and clean exhaust gas are not easy to stay in the device, and can be discharged upward into the flue as soon as possible, so that the working efficiency of the device is high and the processing capacity is strong. Similarly, when the outer diameter of the inner guide tube 40 is 1 / 4 to 1 / 2 of the inner diameter of the flue outer tube 20, similar beneficial effects can also be obtained, which will not be repeated here.

[0033] In this option, if Figure 2 and Figure 3As shown, the cold air pipe 50 includes a tubular equal-diameter pipe connected to the cold air flow supply device, and a flat square pipe connected to the equal-diameter pipe. The square pipe is parallel to the side wall of the flue outer tube 20, so that the cold air flow is sprayed into the flue outer tube 20 along the tangent direction of the inner circumference of the flue outer tube 20 and perpendicular to the high-temperature exhaust gas, and while impacting and cooling the high-temperature exhaust gas, the mixed air flow can form a swirling flow along the circumferential direction and with the largest initial power, thereby increasing the precipitation rate of solid matter in the high-temperature exhaust gas.

[0034] Alternatively, if Figure 1 As shown, the online cleaning device for solid matter in the exhaust gas of the melting furnace also includes a control device, which includes a controller, and a flow regulating valve 71 and a temperature detector 72 connected to the controller. The flow regulating valve 71 is connected to the pipeline of the cold air pipe 50. The temperature detector 72 is connected to the upper end of the guide inner pipe 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 optional scheme, the flow regulating valve 71 is an electric regulating valve, and the temperature detector 72 is a temperature sensor. When working, the electric regulating valve is used to adjust the flow of the cold air flow, and the temperature sensor is used to detect the discharge temperature of the clean exhaust gas. The temperature sensor sends the detected temperature value to the controller in real time. The controller receives the real-time temperature value. If the real-time temperature value is greater than the system preset temperature, the controller controls the opening of the electric regulating valve to increase accordingly. Otherwise, the controller controls the opening of the electric regulating valve to decrease accordingly, thereby achieving the purpose of automatically controlling the temperature of the clean exhaust gas and reducing the dust in the flue. For example, the present scheme adopts 500°C as the optimal exhaust temperature of the exhaust gas (in fact, in the present application, the inventors, after a long period of exploration and a large number of tests and optimized designs, have obtained the optimal temperature range of 400°C to 600°C. Within this temperature range, the removal rate of solid matter in the high-temperature exhaust gas is the highest, and the energy loss is relatively small and the cost is low). The initial temperature of the high-temperature exhaust gas discharged from the melting furnace is 1500°C to 1600°C, and the cooling air is 15°C to 30°C. The controller automatically adjusts the flow rate of the cold air flow by controlling the opening of the electric regulating valve to achieve the purpose of automatically controlling the temperature of the clean exhaust gas and thereby reducing the flue dust.

[0035] Optionally, the first embodiment of the valve member 60 is not shown in the figure, and the valve member 60 includes a mounting box 61 fixed on the outer circumferential surface of the flue outer tube 20, and a valve plate 63 for closing the inner passage of the flue outer tube 20. The mounting box 61 has an outer opening, and the valve plate 63 is slidably mounted in the mounting box 61 through the outer opening. The outer circumferential surface of the flue outer tube 20 is provided with a mounting notch corresponding to the valve plate 63, which is vertically concave and extends from the outer circumferential surface. The mounting notch is communicated with the inner cavity of the mounting box 61, and the valve plate 63 is used to slide into the mounting notch under the action of an external force to block the inner passage of the flue outer tube 20. During normal operation, part of the valve plate 63 is located in the inner cavity of the installation box 61, and the rest is located outside the installation box 61. The valve plate 63 is coordinated with the inner cavity of the installation box 61 to prevent the mixed airflow in the flue outer tube 20 from leaking outward through the gap between the valve plate 63 and the inner cavity of the installation box 61 after passing through the installation slot. When the solid matter in the dust collection barrel 30 needs to be cleaned, the cleaning operator pushes the valve plate 63 with force to make the valve plate 63 slide into the installation slot and continue to push it in. During the process, the valve plate 63 transversely blocks the inner channel of the flue outer tube 20, thereby realizing online cleaning of solid matter.

[0036] Alternatively, a second embodiment of the valve member 60, such as Figure 1 As shown, the valve member 60 includes a mounting box 61 fixed on the outer circumference of the flue outer tube 20, a valve electric push rod 62 arranged on the mounting box 61, and a valve plate 63 for blocking the inner channel of the flue outer tube 20, and the valve electric push rod 62 is connected to the controller. The mounting box 61 has an outer opening, and the valve plate 63 is slidably mounted in the mounting box 61 through the outer opening. The outer circumferential surface of the flue outer tube 20 is provided with a mounting notch corresponding to the valve plate 63, which extends vertically from the inner concave of the outer circumferential surface, and the mounting notch is connected to the inner cavity of the mounting box 61. The fixed end of the valve electric push rod 62 is fixed to the mounting box 61, and its opposite driving end is connected to the outer end of the valve plate 63. During normal operation, part of the valve plate 63 is located in the inner cavity of the installation box 61, and the rest is located outside the installation box 61. The valve plate 63 is arranged in cooperation with the inner cavity of the installation box 61 to prevent the mixed airflow in the flue outer tube 20 from leaking outward through the gap between the valve plate 63 and the inner cavity of the installation box 61 after passing through the installation slot. When the solid matter in the dust collection barrel 30 needs to be cleaned, the valve electric push rod 62 starts to pull and push the valve plate 63, so that the valve plate 63 slides into the installation slot and continues to pull. The valve plate 63 horizontally blocks the inner channel of the flue outer tube 20, thereby realizing online cleaning of solid matter. Preferably, a position sensor for detecting whether the inner channel of the flue outer tube 20 is closed in place is also provided on the valve plate 63, and the position sensor is connected to the controller.

[0037] Alternatively, if Figure 1As shown, the dust collection barrel 30 includes an upper barrel 31 with both ends connected and in a hollow cylindrical shape, a lower barrel 32 with a closed bottom end and an open top end and in a hollow cylindrical shape, and a barrel electric push rod 33 for driving the lower barrel 32 to move, and the barrel electric push rod 33 is connected to the controller. The upper open end of the upper barrel 31 is sealed and connected to the lower open end of the flue outer barrel 20. The upper open end of the lower barrel 32 is hinged to the lower open end of the upper barrel 31 through a hinge. The barrel electric push rod 33 is fixed to the outer circumferential surface of the upper barrel 31, and its driving end is connected to the lower barrel 32. In this optional solution, as Figure 1 As shown, the upper barrel 31 is detachably connected to the flue outer tube 20, so that it is easy to remove the whole barrel to clean the solid matter, reduce the difficulty of cleaning operation and the labor intensity of workers, and make the operation safe and reliable. When the solid matter needs to be cleaned, the barrel electric push rod 33 extends outward to tilt the lower barrel 32 around the hinge point hinged with the upper barrel 31 to pour out the solid particles in the barrel. After the solid particles are cleaned, the barrel electric push rod 33 retracts to make the lower barrel 32 and the upper barrel 31 sealed.

[0038] Alternatively, if Figure 1 As shown, the on-line cleaning device for solid matter in the exhaust gas of the melting furnace also includes a weighing unit 80 connected to the control device. The weighing unit 80 is arranged in the lower barrel 32 to measure the weight of the solid matter online in real time, so that the controller automatically controls the actions of the valve electric push rod 62 and the barrel electric push rod 33 according to the weight value of the solid matter. In actual setting, the weighing unit 80 sends the weighing value to the controller in real time, and the controller obtains the weighing value sent by the weighing unit 80. When the weighing value is equal to the system setting value, the controller drives the valve electric push rod 62 to close the valve member 60. At the same time, the controller also obtains the state of the valve member 60 through the position sensor arranged on the valve plate 63. If it is completely closed, the controller drives the barrel electric push rod 33 to open the lower barrel 32 to dump the solid particles; when the weighing value is 0, the controller drives the barrel electric push rod 33 to retract and also drives the valve electric push rod 62 to open the flue outer tube 20.

[0039] During operation, the valve member 60 is always in an open state, the flue outer cylinder 20 forms a seal with the dust collection barrel 30, and the fixed particles fall directly into the dust collection barrel 30. When the weighing unit 80 reaches the set weight, the controller controls the valve electric push rod 62 to work to close the valve member 60. After the position sensor installed 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 and pour out the solid particles in the barrel. After the solid particles are cleaned, the barrel electric push rod 33 retracts to seal the bottom end of the flue wind box, and then the controller controls the valve electric push rod 62 to open the valve member 60. Since the flue outer cylinder 20 is in a sealed state when the valve member 60 is closed, the pressure of the melting furnace will not change during operation.

[0040] Compared with the existing cleaning methods, the scheme of the present invention reduces the difficulty of flue cleaning. The whole process is automatically controlled and no manual cleaning is required. The operation is simple and convenient. While reducing the difficulty of operation, the cleaning efficiency is greatly improved. At the same time, the labor cost is reduced. Each process is sealed to ensure the stability of the furnace pressure and the stability of the product quality. After the exhaust gas is treated by the flue bellows, the solid matter content is very small, so it is not easy to cause flue blockage.

[0041] Optionally, in order to obtain the relationship between the number of days of the cleaning cycle and the weight of solid matter, the inventor of the present application obtained the following after long-term exploration and a large number of experimental verifications: assuming that the cold air flow rate is Q1 and the temperature is T1, the high-temperature exhaust gas flow rate is Q2 and the temperature is T2, and the clean exhaust gas flow rate is Q3 and the temperature is T3, then:

[0042] (Q1+Q2)(T1+T2)=Q3﹡T3+kmt.

[0043] Where k is the correction factor, m is the weight of the solid matter, and t is the number of days in the cleaning cycle.

[0044] Based on the above formula, we can infer the number of days t in the cleaning cycle, and we can also reversely calculate whether the T2 setting value is reasonable, thereby forming a closed-loop control of the flue control and improving the removal rate and efficiency of solid matter in the high-temperature exhaust gas.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online cleaning device for solid matter in the exhaust gas of a melting furnace, characterized in that: include: A flue bellows is vertically arranged and hollow cylindrical, the top of the flue bellows is open and sealedly connected to the flue, so that clean exhaust gas after solid matter is removed is discharged into the flue, the bottom of the flue bellows can be opened and closed, so as to contain solidified and fallen solid matter and enable the solid matter to be cleaned and discharged regularly, and the lower end of the flue bellows is also provided with a valve member (60) for closing the inner channel at the lower end of the flue bellows during the solid matter cleaning and discharge process, so as to ensure the normal operation of the online cleaning device; The side wall of the flue wind box is also sealed and connected to the flue opening brick (10) of the melting furnace so that the high-temperature waste gas to be treated can be discharged into the flue wind box. The side wall of the flue wind box is also connected to a cold air flow supply device for supplying a cold air flow, so that the cold air flow is introduced 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 downward along the flue wind box, thereby causing solid matter in the high-temperature waste gas to condense and precipitate and fall downward to the bottom end of the flue wind box, while the clean waste gas moves upward under the action of the reaction force and is discharged into the flue through the top opening of the flue wind box; The flue wind box comprises a flue outer tube (20) with two ends connected and in a hollow cylindrical shape, a dust collection bucket (30) for collecting fallen solid matter, a flow guide inner tube (40) for rotating and guiding a mixed air flow downward and guiding clean exhaust gas upward, and a cold air pipe (50) for introducing a cold air flow; the dust collection bucket (30) is sealed and connected to the lower open end of the flue outer tube (20), and the bottom end of the dust collection bucket (30) is openable and closable, and a valve member (60) is arranged on the flue outer tube ( The lower end of the guide inner tube (40) is close to the dust collection barrel (30); the guide inner tube (40) is sealed and fixed in the upper open end of the flue outer tube (20), and the upper end of the guide inner tube (40) is connected to the flue, and the opposite lower end thereof extends downwardly into the flue outer tube (20) along the axis; the side wall of the flue outer tube (20) is also sealed and connected to the flue outlet brick (10), and one end of the cold air pipe (50) is connected to the side wall of the flue outer tube (20), and the opposite other end thereof is used to connect to the cold air flow supply device; The on-line cleaning device for solid matter in the waste gas of a melting furnace further comprises a control device, the control device comprising a controller, and a flow regulating valve (71) and a temperature detector (72) connected to the controller; the flow regulating valve (71) is connected to the pipeline of the cold air pipe (50); the temperature detector (72) is connected to the upper end of the guide inner pipe (40) to detect the temperature of the clean waste gas, thereby enabling the controller to automatically control the opening of the flow regulating valve (71) according to the temperature value of the clean waste gas; The valve member (60) comprises a mounting box (61) fixed on the outer peripheral surface of the flue outer tube (20), and a valve plate (63) for closing the inner passage of the flue outer tube (20); the mounting box (61) has an outer opening, and the valve plate (63) is slidably mounted in the mounting box (61) through the outer opening; a mounting notch extending perpendicularly to the inner concave surface of the outer circular surface is provided on the outer circular surface of the flue outer tube (20) 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 to be slidably inserted into the mounting notch under the action of an external force to block the inner passage of the flue outer tube (20).

2. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 1, characterized in that: The length of the guide inner tube (40) extending into the flue outer tube (20) is 1 / 3 to 1 / 2 of the total length of the flue outer tube (20); The outer diameter of the flow guide inner tube (40) is 1 / 4 to 1 / 2 of the inner diameter of the flue outer tube (20).

3. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 1, characterized in that: The cold air pipe (50) comprises a tubular tube of equal diameter used for connecting to the cold air flow supply device, and a flat square tube connected to the equal diameter tube; The square tube is parallel to and connected to the side wall of the flue outer cylinder (20), so that the cold air flow is sprayed into the flue outer cylinder (20) along the tangent direction of the inner circumference of the flue outer cylinder (20) and perpendicularly to the high-temperature exhaust gas.

4. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 1, characterized in that: The valve component (60) comprises a mounting box (61) fixed on the outer peripheral surface of the flue outer tube (20), a valve electric push rod (62) arranged on the mounting box (61), and a valve plate (63) for isolating the inner channel of the flue outer tube (20); the valve electric push rod (62) is connected to a controller; The installation box (61) has an outer opening, and the valve plate (63) is slidably installed in the installation box (61) through the outer opening; An installation notch is provided on the outer circumferential surface of the flue outer cylinder (20) corresponding to the valve plate (63), and extends inwardly from the outer circumferential surface in a perpendicular manner, and the installation notch is communicated with the inner cavity of the installation box (61); The fixed end of the valve electric push rod (62) is fixed to the mounting box (61), and the opposite driving end is connected to the outer end of the valve plate (63).

5. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 4, characterized in that: The dust collection bucket (30) comprises an upper bucket (31) with two ends connected and in a hollow cylindrical shape, a lower bucket (32) with a closed bottom end and an open top end and in a hollow cylindrical shape, and a bucket electric push rod (33) for driving the lower bucket (32) to move, wherein the bucket electric push rod (33) is connected to a controller; The upper opening end of the upper barrel (31) is sealedly connected to the lower opening end of the flue outer cylinder (20); The upper opening end of the lower barrel (32) is hinged to the lower opening end of the upper barrel (31) via a hinge; The barrel electric push rod (33) is fixed on the outer peripheral surface of the upper barrel (31), and its driving end is connected to the lower barrel (32).

6. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 5, characterized in that: The on-line cleaning device for solid matter in the exhaust gas of a melting furnace further comprises a weighing unit (80) connected to the control device; The weighing unit (80) is disposed in the lower barrel (32) to measure the weight of the solid material online in real time, thereby enabling the controller to automatically control the actions of the valve electric push rod (62) and the barrel electric push rod (33) according to the weight value of the solid material.

7. The on-line cleaning device for solid matter in the exhaust gas of a melting furnace according to claim 6, characterized in that: Assume that the cold air flow is Q1 and the temperature is T1, the high-temperature exhaust gas flow is Q2 and the temperature is T2, and the clean exhaust gas flow is Q3 and the temperature is T3, then: (Q1+Q2) (T1+T2) = Q3*T3+kmt; Where k is the correction factor, m is the weight of the solid matter, and t is the number of days in the cleaning cycle.

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