Secondary smoke collection and purification device for mobile casting electric furnace smelting

Abstract

The present invention discloses a mobile electric furnace smelting secondary smoke collection and purification device for casting, including a collection part, a left cover and a right cover are located on both sides of the electric furnace, and a return air channel with multiple nozzles is arranged on the top of the left cover, and an exhaust air channel is arranged on the top of the right cover; it also includes a purification part, which includes a ventilator and a dust collector arranged on the outer side wall of the left cover, and an exhaust chimney is arranged on the dust collector; and a connecting part, which includes a telescopic air duct connected to the outlet of the exhaust air channel at one end and the inlet of the ventilator at the other end, a return air duct connected to the outlet of the ventilator at one end and the inlet of the return air channel at the other end, and a dust removal pipe connected to the outlet of the ventilator at one end and the inlet of the dust collector at the other end. The present invention uses a split-type mobile collection cover, and the pressurized air at the outlet of the ventilator forms a certain airflow organization through the nozzle, which can drive the high-temperature floating jet to flow to the exhaust air outlet, thereby improving the collection efficiency of the collection cover.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal for smelting electric furnaces in the foundry industry, and in particular to a mobile type of secondary smoke capture and purification device for smelting electric furnaces used in foundry. Background Art

[0002] Electric furnace smelting is an important link in the foundry industry. When performing operations such as charging, furnace repair, and iron tapping, it is necessary to open the furnace cover to perform other process operations such as charging. At this time, the high-temperature floating jet in the furnace is prone to escape, and a large amount of high-temperature smoke and dust diffuses into the workshop, causing a great impact on the workshop environment. Therefore, at present, a capture hood is mostly installed above the electric furnace, and the captured smoke enters the outdoor dust removal device along the pipeline, and is discharged after purification and dust removal. The above-mentioned capture hood dust removal system has high equipment investment and high operating energy consumption. Since the capture hood is located above the electric furnace, it is easy to affect the operations of charging, furnace repair, and iron tapping. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a mobile electric furnace smelting secondary smoke capture and purification device for casting, which can specifically adopt the following technical solutions:

[0004] The mobile casting electric furnace smelting secondary smoke collection and purification device of the present invention comprises:

[0005] The collecting part comprises a left cover and a right cover which are arranged on both sides of the electric furnace relatively, the top of the left cover is provided with a return air channel, the return air channel is provided with a plurality of nozzles located on the inner side of the left cover, the top of the right cover is provided with an exhaust air channel, the air inlet of the exhaust air channel is arranged on the inner side of the right cover;

[0006] The purification part includes a ventilator arranged on the inner side of the left cover and a dust collector arranged on the outer side of the left cover and movable with the left cover, wherein the dust collector is provided with an exhaust chimney;

[0007] Connection part, including

[0008] A telescopic air duct, one end of which is connected to the outlet of the exhaust passage, and the other end of which is connected to the inlet of the ventilator;

[0009] A return air duct, one end of which is connected to the outlet of the ventilator, and the other end of which is connected to the inlet of the return air channel;

[0010] A dust removal pipe, one end of which is connected to the outlet of the ventilator, and the other end of which is connected to the inlet of the dust collector.

[0011] Wheels are arranged at the bottom of the left cover and the right cover, and the wheels are matched with an X-direction linear guide rail extending from left to right on the ground.

[0012] The return air channel and the exhaust air channel are both arranged along the Y direction, the nozzles are arranged at intervals on the inner side of the return air channel and face the air inlet of the exhaust air channel, and the air inlet of the exhaust air channel is a grid plate structure.

[0013] A wind shield is arranged on the inner side of the right cover, and the wind shield is located below the air inlet of the exhaust passage.

[0014] The telescopic air duct includes a first section arranged at the top of the return air channel, a second section arranged between the left cover and the right cover, and a third section arranged on the outside of the left cover and extending toward the ventilator inlet. The first section, the second section and the third section are connected in sequence, and the second section is a telescopic sleeve structure.

[0015] The return air duct and the dust removal duct are respectively connected to the outlet main pipe of the ventilator.

[0016] A dust cleaning mechanism is also arranged on the outside of the left cover, and the dust cleaning mechanism includes an air compressor and a compressed air bag connected to the dust collector.

[0017] The ventilator is a speed-adjustable fan.

[0018] The mobile electric furnace smelting secondary smoke dust capture and purification device for casting provided by the present invention uses a split-type mobile capture hood and a circulating air system is arranged between the two, wherein the pressurized air at the outlet of the ventilator forms a certain airflow organization through the nozzle, and drives the high-temperature floating jet flow to flow toward the exhaust port, thereby improving the capture efficiency of the capture hood; since most of the smoke returns at the outlet of the ventilator and participates in the airflow organization in the hood, the remaining small part of the smoke enters the dust collector for purification, therefore, the ventilation volume of the dust collector is reduced, the volume of the dust collector is reduced, and the investment amount is reduced; the above-mentioned dust collector can be fixed on the capture hood and move with it, avoiding the defect of insufficient on-site space when arranging the pipeline; the ventilation volume of the above-mentioned ventilator can also be automatically adjusted according to the opening width of the capture hood, and the airflow organization in the hood can be optimized according to needs, effectively reducing the energy consumption of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 Left view of .

[0021] Figure 3 yes Figure 1 Right view of . DETAILED DESCRIPTION

[0022] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific working process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0023] like Figure 1-3 As shown, the mobile electric furnace smelting secondary smoke collection and purification device for casting of the present invention is composed of a collection part, a purification part and a connection part.

[0024] The above-mentioned collection part includes a left cover 101 and a right cover 102 which are arranged on both sides of the electric furnace. Wheels 103 are installed at the bottom of both covers for fitting with an X-direction linear guide rail 104 extending from left to right on the ground, so as to facilitate the opening or closing of the left cover 101 and the right cover 102. A Y-direction return air channel 105 is arranged on the top of the left cover 101, and a plurality of nozzles 106 located on the inner side of the left cover 101 are installed on the return air channel 105; a Y-direction exhaust air channel 107 is arranged on the top of the right cover 102, and an air inlet 108 of the exhaust air channel 107 is a grid plate structure, which is located on the inner side of the right cover 102 and opposite to the nozzle 106. When in use, the nozzle 106 of the left cover 101 can blow out a pressurized airflow, which can change the flow direction of the floating jet in the cover, so that most of the dusty smoke overflowing from the electric furnace flows to the right cover 102 and enters the exhaust air channel 107 through the air inlet 108, thereby improving the pollutant collection efficiency. Typically, a windshield plate 109 is installed on the inner side of the right cover 102 below the air inlet of the exhaust passage 107 to optimize the airflow organization in the left cover 101 and the right cover 102 and further improve the pollutant capture efficiency.

[0025] The purification unit includes a ventilator 201 installed on the outside of the left cover 101 and a dust collector 202 installed on the outside of the left cover 101. The ventilator 201 is a speed-adjustable fan, and its ventilation volume increases with the increase of the distance between the left cover 101 and the right cover 102, and when the left cover 101 and the right cover 102 are closed, the ventilation volume is the smallest. The dust collector 202 adopts a bag dust collector, which can withstand the high temperature of flue gas above 300°C and the particulate matter above 500°C, and the concentration of the particulate matter after purification is not more than 2.4mg / m³. An exhaust chimney 203 is installed on the dust collector 202, and the dust collector 202 is also connected to a cleaning mechanism composed of an air compressor 204 and a compressed air bag 205. When the dust collector 202 reaches the cleaning pressure, the compressed air pre-stored in the compressed air bag 205 can be sprayed for cleaning. Since the dust collector 202 is fixed on the left cover 101, the difficulty of arranging the relevant exhaust pipes can be reduced, thereby reducing the overall construction cost by about 20%.

[0026] The connecting part includes a telescopic air duct 301, a return air duct 302 and a dust removal duct 303. One end of the telescopic air duct 301 is connected to the outlet of the exhaust duct 107, and the other end is connected to the inlet of the fan 201. Specifically, the telescopic air duct 301 includes a first section, a second section and a third section connected in sequence, the first section is located at the top of the return air channel 105, the second section is located between the left cover 101 and the right cover 102, and is a telescopic sleeve structure suitable for the change of the distance between the left and right covers, and the third section is located outside the left cover 101 and extends to the inlet of the fan 201. One end of the return air duct 302 is connected to the outlet of the fan 201, and the other end is connected to the inlet of the return air channel 105. One end of the dust removal duct 303 is connected to the outlet of the fan 201, and the other end is connected to the inlet of the dust collector 202. The return air duct 302 and the dust removal duct 303 are respectively connected to the outlet main pipe of the fan 201.

[0027] When in use, the ventilator 201 is started, and the dusty smoke overflowing from the electric furnace enters the telescopic air duct 301 through the exhaust channel 107, and is divided into two parts at the outlet of the ventilator 201. One part enters the return air channel 105 and is ejected under pressure through the nozzle 106, which can effectively change the flow direction of the floating jet in the hood and prevent the dusty smoke in the hood from escaping; the other part enters the dust collector 202 through the dust removal pipe 303 for purification, and is discharged through the exhaust chimney 203 after reaching the indoor emission limit standard. After the above treatment, the total amount of particulate matter emissions in the exhaust gas is reduced by 60%-80% compared with the traditional treatment, and the environmental protection benefits are obvious; for heating areas, the heating energy consumption caused by ventilation can be eliminated.

[0028] During the operation of the electric furnace, the fan 201 should continue to work, and the operation mode of the fan 201 is changed only by adjusting the opening of the left cover 101 and the right cover 102. Normally, when the electric furnace is smelting and tapping iron, the left cover 101 and the right cover 102 are closed, and the ventilation volume of the fan is the minimum; when the electric furnace is charging, repairing the furnace, etc., the left cover 101 and the right cover 102 are opened, and the ventilation volume of the fan is the maximum. According to calculations, this working mode can reduce the operating energy consumption by 20%-30%.

[0029] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships, such as "front", "rear", "left", "right", "vertical", "horizontal", "inside", "outside", etc., are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

Claims

1. A mobile casting electric furnace smelting secondary smoke capture and purification device, characterized by: include The collecting part comprises a left cover and a right cover which are arranged on both sides of the electric furnace relatively, the top of the left cover is provided with a return air channel, the return air channel is provided with a plurality of nozzles located on the inner side of the left cover, the top of the right cover is provided with an exhaust air channel, the air inlet of the exhaust air channel is arranged on the inner side of the right cover; The purification part includes a ventilator and a dust collector arranged on the outer side wall of the left cover, and the dust collector is provided with an exhaust chimney; Connection part, including A telescopic air duct, one end of which is connected to the outlet of the exhaust passage, and the other end of which is connected to the inlet of the ventilator; A return air duct, one end of which is connected to the outlet of the ventilator, and the other end of which is connected to the inlet of the return air channel; A dust removal pipe, one end of which is connected to the outlet of the ventilator, and the other end of which is connected to the inlet of the dust collector; The return air channel and the exhaust air channel are both arranged along the Y direction, the nozzles are arranged at intervals inside the return air channel and facing the air inlet of the exhaust air channel, and the air inlet of the exhaust air channel is a grid plate structure; The telescopic air duct includes a first section arranged at the top of the return air channel, a second section arranged between the left cover and the right cover, and a third section arranged outside the left cover and extending toward the ventilator inlet, the first section, the second section and the third section are connected in sequence, and the second section is a telescopic sleeve structure; The return air duct and the dust removal duct are respectively connected to the outlet main pipe of the ventilator.

2. The mobile electric furnace smelting secondary smoke collection and purification device for casting according to claim 1 is characterized in that: The bottom of the left cover and the bottom of the right cover are both provided with wheels with driving power, and the wheels are adapted to the X-direction linear guide rails extending from left to right on the ground.

3. The mobile electric furnace smelting secondary smoke collection and purification device for casting according to claim 1 is characterized in that: A wind shield is arranged on the inner side of the right cover, and the wind shield is located below the air inlet of the exhaust passage.

4. The mobile casting electric furnace smelting secondary smoke collection and purification device according to claim 1 is characterized in that: A dust cleaning mechanism is also arranged on the outside of the left cover, and the dust cleaning mechanism includes an air compressor and a compressed air bag connected to the dust collector.

5. The mobile casting electric furnace smelting secondary smoke capture and purification device according to claim 1 is characterized in that: The ventilator is a speed-adjustable fan.

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