Ground pouring and cooling flue gas trapping method

Abstract

The invention discloses a ground pouring and cooling flue gas gathering method, which is realized by combining a flue gas gathering cover, and the flue gas gathering cover comprises a door-shaped telescopic cover provided with a circulating air outlet, a dust removal and purification air outlet, a roller shutter door and a circulating air supply pipe; the number of the circulating air outlets is two, circulating air supply outlets for supplying air into the door-shaped telescopic cover are formed in the circulating air supply pipes, and each circulating air outlet is connected with one circulating air supply pipe through one telescopic pipe. A suspension cover is further arranged at the end of the door-shaped telescopic cover and composed of a pouring air supply pipe and a pouring air return pipe which are connected through an exhaust fan, a pouring air supply opening is formed in the pouring air supply pipe, and a pouring air return opening is formed in the pouring air return pipe. And the dust removal and purification exhaust outlet is connected with the dust removal and purification device through a sliding sealing pipe mechanism. According to statistics, the ventilation quantity can be reduced by about 50% during pouring, the ventilation quantity can be reduced by about 80% during cooling, the operation energy consumption of the system is reduced, the initial investment and the maintenance cost of the system are reduced, and good green and low-carbon effects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of dust-containing flue gas capture, in particular to a ground pouring and cooling flue gas capture method. Background Art

[0002] Ground pouring is one of the main casting processes. The waste gas generated during the casting and cooling process of the casting needs to be captured and purified so that the environment in the workshop meets the occupational health and environmental standards, and at the same time, the outdoor atmospheric environment is prevented from being polluted. Since the sand mold layout area in ground casting is often large, and the sand mold layout area and the sand mold cooling area will change in real time according to the production arrangement, the location of the pollution source is dynamically changing rather than fixed in a certain place. Secondly, if the capture hood is a fixed structure, its coverage area is too large, which will affect normal production; if the capture hood adopts a telescopic structure, due to the long telescopic distance, it is easy to derail, etc., affecting the use of the capture hood. Thirdly, the pouring process requires the crane to lift the ladle for operation, and the sand mold transportation process also requires the crane to lift the operation. Therefore, the upper space of the pouring area needs to be reserved for process operation, and a fixed closed hood cannot be used for fume capture. Finally, the existing equipment for exhaust gas capture needs to have a large ventilation volume, so the initial investment is high and the system operation energy consumption is high, which is not conducive to the green, low-carbon development and high-quality development of the foundry industry. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a ground pouring and cooling smoke capture method, which can specifically adopt the following technical solutions: The ground pouring and cooling fume capture method of the present invention is realized by combining a fume capture hood, and is characterized in that: The combined fume capture hood comprises a door-type telescopic hood arranged on the ground, a circulating exhaust port and a dust removal and purification exhaust port are arranged in the middle of the door-type telescopic hood, and a rolling shutter door and a circulating air supply pipe are arranged at the end of the door-type telescopic hood; there are two circulating exhaust ports, and a plurality of circulating air supply ports for supplying air into the door-type telescopic hood are arranged on the circulating air supply pipe, and each circulating exhaust port is connected to a circulating air supply pipe through a telescopic pipe; a suspended hood for capturing casting fume is also arranged at the end of the door-type telescopic hood, and the suspended hood is composed of a casting air supply pipe and a casting return air pipe connected to an exhaust fan, and a plurality of casting air supply ports for supplying air into the door-type telescopic hood are arranged on the casting air supply pipe, and the casting return air pipe is arranged opposite to the casting air supply pipe, and a casting return air port with a downward opening is arranged thereon; the dust removal and purification exhaust port is connected to the dust removal and purification device through a sliding sealing pipe mechanism; The capture method comprises: 1) Pouring conditions: Move the door-type telescopic cover to the vicinity of the sand box to be poured, lower the shutter door at one end of the sand box away from the sand box to be poured to close the opening at that end, adjust the suspension cover at the other end to the upper part of the sand box to be poured, turn on the exhaust fan, and pour the sand box. The air supply jet formed by the pouring air supply port of the suspension cover sends the smoke generated by pouring and the iron ladle into the door-type telescopic cover. After being captured by the wind curtain formed in the door-type telescopic cover, it gathers in the middle and rises upward. A part of it returns to the door-type telescopic cover through the circulating exhaust port and the circulating air supply pipe, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port, and is discharged after the dust removal and purification meet the standards; 2) Cooling conditions: When cooling the sand box, lower the shutter doors at both ends to form a closed space with the door-type telescopic cover, so that the air supply airflow of the circulating air supply pipes at both ends forms an air curtain. The exhaust gas released by the sand box is captured by the air curtain and gathered in the middle and rises upward. A part of it returns to the door-type telescopic cover through the circulating air outlet and the circulating air supply pipe, and the other part enters the dust removal and purification device through the dust removal and purification exhaust outlet, and is discharged after the dust removal and purification meet the standards; 3) Non-operating conditions: When there is no pouring and cooling in the pouring area, the door-type telescopic cover shrinks together to provide more operating space for process operations.

[0004] The door-type telescopic cover is composed of a rigid exhaust section, a rigid end section and a telescopic section, wherein the rigid exhaust section is located in the middle, the rigid end section is located on both sides of the rigid exhaust section, and the telescopic section is used to connect the rigid exhaust section and the rigid end section.

[0005] The bottoms of the rigid exhaust section, the rigid end section and the telescopic section are all provided with walking wheels, the circulating air outlet and the dust removal and purification air outlet are arranged at the top of the rigid exhaust section, and the circulating air supply pipe is arranged at the top of the rigid end section.

[0006] The telescopic tubes are both provided with circulating fans, the two telescopic tubes are parallel to each other, and are both arranged along the longitudinal direction of the door-type telescopic cover; the circulating air supply pipe, and the connecting line of the circulating exhaust port and the dust removal and purification exhaust port are perpendicular to the telescopic tubes.

[0007] Both ends of the top of the door-type telescopic cover are provided with linear guide rails. The linear guide rails, the cast air supply pipe, and the cast return air pipe are all parallel to the circulating air supply pipe. The cast return air pipe is located on the side close to the door-type telescopic cover, and the cast air supply pipe is located on the side away from the door-type telescopic cover, and the cast return air pipe is slidably connected to the linear guide rails.

[0008] The angles between the air supply directions of the circulating air supply ports and the pouring air supply ports and the horizontal plane are both 30-50°.

[0009] The ground pouring and cooling smoke capture method provided by the present invention is realized by a combined smoke capture hood with a simple structure, easy use, high degree of automation and low operating energy consumption. A suspended hood is arranged at the end of the telescopic hood, so that the pouring smoke can be quickly captured and enter the telescopic hood for purification, thereby solving the problem that the traditional fixed closed hood affects the pouring operation; the telescopic hood adopts a staggered arrangement of rigid segments and flexible telescopic segments, which can avoid the phenomenon of easy derailment due to excessive telescopic distance, and can cover a larger area, thereby improving the smoke capture effect during the cooling of the sand box and avoiding damage to the occupational health environment in the workshop; because the telescopic hood not only exhausts air to the dust removal and purification device, but also adopts an internal circulating wind mode, the wind curtain formed by the circulating wind effectively increases the wind speed of the cross section in the hood, thereby improving the smoke capture effect and reducing the dust collector processing air volume, achieving the effects of efficient capture, low-carbon operation, and reducing the initial investment and operating costs of the equipment.

[0010] The present invention can effectively reduce the diffusion of dusty smoke generated during pouring and sand box cooling in the foundry, avoid the health hazards of smoke retention caused by low cross-sectional wind speed to personnel entering the hood for maintenance, and avoid the damage to the workshop environment caused by smoke escaping into the workshop when the hood shrinks. According to statistics, the present invention can reduce the ventilation volume by about 50% during pouring and by about 80% during cooling, which not only reduces the operating energy consumption of the system, but also reduces the initial investment and maintenance costs of the system, and has a good green and low-carbon effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional diagram of the casting condition of the combined smoke capture hood described in the present invention.

[0012] Figure 2 It is a three-dimensional diagram of the contraction condition of the combined smoke capture hood described in the present invention.

[0013] Figure 3 yes Figure 1 Elevation drawing of .

[0014] Figure 4 yes Figure 2 Top view of the .

[0015] Figure 5 yes Figure 3 AA section view in.

[0016] Figure 6 yes Figure 4 BB cross-section diagram in.

[0017] Figure 7 It is an airflow organization diagram of the present invention during the pouring operation. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1-7 As shown, the ground pouring and cooling smoke capture method of the present invention is realized by a combined smoke capture hood, which includes a door-type telescopic hood 1 and a suspended hood 2 connected thereto.

[0020] Specifically, the door-type telescopic cover 1 is arranged on the ground slide rail, and is composed of a rigid exhaust section 11, two rigid end sections 12 and two telescopic sections 13. Among them, the rigid exhaust section 11 is located in the middle, the rigid end sections 12 are located on both sides of the rigid exhaust section 11, and the telescopic section 13 is used to connect the rigid exhaust section 11 and the rigid end section 12. The above-mentioned rigid exhaust section 11 and the two rigid end sections 12 are made of metal materials, and the telescopic section 13 is composed of a metal telescopic frame and a fireproof cover body covering it. In order to facilitate movement, the bottom of the rigid exhaust section 11, the rigid end section 12 and the telescopic section 13 are all equipped with running wheels that are compatible with the ground slide rail. Usually, the driving device of the running wheel is installed on one side of the rigid end section 12.

[0021] The top of the rigid exhaust section 11 is provided with an exhaust port, which is specifically divided into three, one of which is a dust removal and purification exhaust port 3, and the other two are circulating exhaust ports 4, and the three are arranged in sequence along the hood body in the horizontal direction. A horizontal circulating air supply pipe 5 is provided on the top of each rigid end section 12, and each circulating air supply pipe 5 is connected to a circulating exhaust port 4 through a telescopic pipe 6. Normally, the two telescopic pipes 6 are parallel to each other and are both arranged along the longitudinal direction of the door-type telescopic cover 1; the circulating air supply pipe 5, and the central line connecting the circulating exhaust port 4 and the dust removal and purification exhaust port 3 are perpendicular to the telescopic pipe 6. Each telescopic pipe 6 is provided with a circulating fan 7, and each circulating air supply pipe 5 is provided with a plurality of circulating air supply ports for supplying air to the door-type telescopic cover 1. When the circulating fan 7 is turned on, the airflow blown out of the circulating air supply pipe 5 at both ends of the hood body is blown downward at a certain angle to blow the smoke rising in the hood body due to the buoyancy to the exhaust port at the top of the rigid exhaust section 11 (i.e., forming a wind curtain that increases the wind speed in the cross section of the hood). Generally, the air supply direction of the circulating air supply port on the circulating air supply pipe 5 is at an angle of 30-50° to the horizontal plane, and the outlet wind speed of the circulating air supply port is 6-12 m / s. In addition, a receiving box for receiving a rolling shutter door is also installed on the top of the rigid end section 12.

[0022] The above-mentioned dust removal and purification air outlet 3 is connected to the dust removal and purification device through a sliding sealing pipe mechanism, which is used to discharge the smoke in the door-type telescopic cover 1 to the dust removal and purification device and empty it after the exhaust gas meets the standard. The sliding sealing pipe mechanism adopts the structure of the dust removal method of the single-track telescopic cover of CN2022106753521, which includes a longitudinal exhaust pipe 31 arranged at the inlet end of the dust removal and purification unit, and the top surface of the longitudinal exhaust pipe 31 is provided with a longitudinal through groove, and a sealing belt adsorbed by negative pressure is arranged on the longitudinal through groove; it also includes a movable air duct joint 32 arranged at the dust removal and purification air outlet 3, and the movable air duct joint 32 includes a pipe joint connected to the outlet pipe of the dust removal and purification air outlet 3, and a sealing cover arranged on the outside of the pipe joint; wherein the pipe joint is located between the sealing belt and the longitudinal exhaust pipe 31, and the lower opening of the pipe joint corresponds to the longitudinal through groove; the sealing cover is located on the outside of the sealing belt, and the lower opening of the sealing cover is sealed with the sealing belt. Since the lower opening of the pipe joint is always connected to the longitudinal exhaust duct 31, and the sealing belt on its outside can keep the longitudinal groove of the longitudinal exhaust duct 31 in a sealed state when subjected to negative pressure adsorption, the dust removal and purification exhaust port 3 can still be smoothly exhausted after the position is moved by sliding the sealing tube mechanism.

[0023] The suspension hood 2 is located at both ends of the top of the door-type telescopic hood 1 and is used to capture the pouring smoke. The suspension hood 2 is composed of a pouring air supply pipe 22 and a pouring return air pipe 23 connected to an exhaust fan 21, and is U-shaped as a whole. Specifically, transverse linear guides 8 are respectively provided at both ends of the top of the door-type telescopic hood 1. The linear guides 8, the pouring air supply pipe 22, and the pouring return air pipe 23 are all parallel to the circulating air supply pipe 5. The pouring return air pipe 12 is located on the side close to the door-type telescopic hood 1, and the pouring air supply pipe 22 is located on the side away from the door-type telescopic hood 1. The pouring return air pipe 23 is slidably connected to the linear guide 8, so that the suspension hood 2 can be moved according to the specific sand box pouring position, so as to quickly and efficiently capture the pouring smoke. The pouring air supply pipe 22 is provided with a plurality of pouring air supply ports for supplying air to the door-type telescopic hood 1, and the pouring return air pipe 23 is provided with a pouring return air port opening downward. Normally, the angle between the air supply direction of the pouring air supply port and the horizontal plane is 30-50°. When in use, the suspension cover 2 is adjusted to the top of the pouring sand box, the ladle hanging rope is located between the pouring air supply pipe 22 and the pouring return air pipe 23, the exhaust fan 21 is started, and the pouring operation is carried out. A large amount of high-temperature smoke and dust evaporates upward and is captured by the pouring return air port. The exhaust fan 21 extracts the pouring smoke from the pouring return air pipe 23 and sends it out from the pouring air supply pipe 22, forming an air supply jet to suck the pouring smoke and enter the door-type telescopic cover 1, which is captured by the high-speed air curtain inside the door-type telescopic cover 1 and enters the exhaust port at the top of the rigid exhaust section 11 along with the circulating air flow.

[0024] The ground pouring and cooling smoke capture method of the present invention comprises: 1) Casting conditions: Move the door-type telescopic cover 1 to the vicinity of the sand box to be cast, and hoist the ladle to the upper part of the casting sand box by the crane, so that the suspension cover 2 on this side moves along the linear guide rail 8 to the top of the ladle, and the ladle hanging rope is located in the middle of the suspension cover 2, and at the same time, the roller shutter door on the other side of the door-type telescopic cover 1 is lowered to close the opening at this end. After turning on the exhaust fan 21 of the suspension cover 2 and the circulating fan 7 of the door-type telescopic cover 1, the sand box casting is carried out, and the air supply jet formed by the casting air supply port of the suspension cover 2 sends the smoke generated by the casting and the ladle into the door-type telescopic cover 1, and is captured by the high-speed air curtain formed by the circulating air supply ports at both ends of the door-type telescopic cover 1. The smoke in the cover gathers to the middle and rises upward, and a part of it returns to the door-type telescopic cover 1 through the circulating exhaust port 4 and the circulating air supply pipe 5, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port 3, and is discharged after the dust removal and purification meet the standards.

[0025] 2) Cooling conditions: When cooling the sand box, lower the shutter doors at both ends to form a closed space for the door-type telescopic cover 1, turn on the circulating fan 7, and form a high-speed air curtain with the air supply airflow from the circulating air supply pipe 5 at both ends. The waste gas released by the sand box is captured by the high-speed air curtain and gathered in the middle and rises upward. A part of it returns to the door-type telescopic cover 1 through the circulating exhaust port 4 and the circulating air supply pipe 5, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port 3, and is discharged after the dust removal and purification meet the standards. Since the entire door-type telescopic cover 1 is in a closed state, the required exhaust volume is small at this time, and the ventilation volume is reduced by frequency modulation of the dust removal and purification fan, thereby reducing the operating energy consumption.

[0026] 3) Non-operating conditions: When there is no pouring and cooling condition in the pouring area, the door-type telescopic cover 1 is retracted together under the action of the travel wheel drive device to provide more operating space for process operation.

[0027] 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 method for collecting ground pouring and cooling smoke, achieved by combining a smoke collection hood, characterized in that: The combined fume capture hood comprises a door-type telescopic hood arranged on the ground, a circulating exhaust port and a dust removal and purification exhaust port are arranged in the middle of the door-type telescopic hood, and a rolling shutter door and a circulating air supply pipe are arranged at the end of the door-type telescopic hood; there are two circulating exhaust ports, and a plurality of circulating air supply ports for supplying air into the door-type telescopic hood are arranged on the circulating air supply pipe, and each circulating exhaust port is connected to a circulating air supply pipe through a telescopic pipe; a suspended hood for capturing casting fume is also arranged at the end of the door-type telescopic hood, and the suspended hood is composed of a casting air supply pipe and a casting return air pipe connected to an exhaust fan, and a plurality of casting air supply ports for supplying air into the door-type telescopic hood are arranged on the casting air supply pipe, and the casting return air pipe is arranged opposite to the casting air supply pipe, and a casting return air port with a downward opening is arranged thereon; the dust removal and purification exhaust port is connected to the dust removal and purification device through a sliding sealing pipe mechanism; The capture method comprises: 1) Pouring conditions: Move the door-type telescopic cover to the vicinity of the sand box to be poured, lower the shutter door at one end of the sand box away from the sand box to be poured to close the opening at that end, adjust the suspension cover at the other end to the upper part of the sand box to be poured, turn on the exhaust fan, and pour the sand box. The air supply jet formed by the pouring air supply port of the suspension cover sends the smoke generated by pouring and the iron ladle into the door-type telescopic cover. After being captured by the wind curtain formed in the door-type telescopic cover, it gathers in the middle and rises upward. A part of it returns to the door-type telescopic cover through the circulating exhaust port and the circulating air supply pipe, and the other part enters the dust removal and purification device through the dust removal and purification exhaust port, and is discharged after the dust removal and purification meet the standards; 2) Cooling conditions: When cooling the sand box, lower the shutter doors at both ends to form a closed space with the door-type telescopic cover, so that the air supply airflow of the circulating air supply pipes at both ends forms an air curtain. The exhaust gas released by the sand box is captured by the air curtain and gathered in the middle and rises upward. A part of it returns to the door-type telescopic cover through the circulating air outlet and the circulating air supply pipe, and the other part enters the dust removal and purification device through the dust removal and purification exhaust outlet, and is discharged after the dust removal and purification meet the standards; 3) Non-operating conditions: When there is no pouring and cooling in the pouring area, the door-type telescopic cover shrinks together to provide more operating space for process operations.

2. The method for collecting ground pouring and cooling smoke according to claim 1, characterized in that: The door-type telescopic cover is composed of a rigid exhaust section, a rigid end section and a telescopic section, wherein the rigid exhaust section is located in the middle, the rigid end section is located on both sides of the rigid exhaust section, and the telescopic section is used to connect the rigid exhaust section and the rigid end section.

3. The ground pouring and cooling fume capture method according to claim 2, characterized in that: The bottoms of the rigid exhaust section, the rigid end section and the telescopic section are all provided with walking wheels, the circulating air outlet and the dust removal and purification air outlet are arranged on the top of the rigid exhaust section, and the circulating air supply pipe is arranged on the top of the rigid end section.

4. The ground pouring and cooling fume capture method according to claim 1, characterized in that: The telescopic tubes are both provided with circulating fans, the two telescopic tubes are parallel to each other, and are both arranged along the longitudinal direction of the door-type telescopic cover; the circulating air supply pipe, and the connecting line of the circulating exhaust port and the dust removal and purification exhaust port are perpendicular to the telescopic tubes.

5. The ground pouring and cooling fume capture method according to claim 1, characterized in that: Both ends of the top of the door-type telescopic cover are provided with linear guide rails. The linear guide rails, the cast air supply pipe, and the cast return air pipe are all parallel to the circulating air supply pipe. The cast return air pipe is located on the side close to the door-type telescopic cover, and the cast air supply pipe is located on the side away from the door-type telescopic cover, and the cast return air pipe is slidably connected to the linear guide rails.

6. The ground pouring and cooling fume capture method according to claim 1, characterized in that: The angles between the air supply directions of the circulating air supply ports and the pouring air supply ports and the horizontal plane are both 30-50°.

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