Ground pouring and cooling flue gas capture method

Abstract

The present invention discloses a method for capturing flue gas during ground pouring and cooling, which is achieved by combining a flue gas capture hood. The method comprises a door-shaped telescopic hood equipped with a circulating exhaust port, a dust removal and purification exhaust port, a rolling shutter door, and a circulating air supply pipe. The circulating exhaust port is provided with two circulating air supply ports, each of which is connected to a circulating air supply pipe via a telescopic pipe. The end of the door-shaped telescopic hood is also provided with a suspended hood, which is composed of a pouring air supply pipe and a pouring return air pipe connected to an exhaust fan. The pouring air supply pipe is provided with a pouring air supply port, and the pouring return air pipe is provided with a pouring return air port. The dust removal and purification exhaust port is connected to the dust removal and purification device via a sliding sealing pipe mechanism. According to statistics, the present invention can reduce ventilation volume by approximately 50% during pouring and by approximately 80% during cooling, thereby reducing not only the operating energy consumption of the system but also the initial investment and maintenance costs of the system, achieving good green and low-carbon effects.

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 casting is a major foundry process. Exhaust gases generated during the casting and cooling processes require capture and purification to ensure the workshop environment meets occupational health and safety standards while preventing contamination of the outdoor atmosphere. Because the mold layout area in ground casting is often large and changes in real time based on production schedules, the location of the pollution source is dynamic rather than fixed. Furthermore, if the capture hood is a fixed structure, its large coverage area will disrupt normal production. If the capture hood is a telescopic structure, its long telescopic range makes it prone to derailment, hindering its use. Furthermore, the pouring process requires a crane to lift the ladle for operation, and the sand mold transportation also requires a crane for lifting operations. Therefore, the space above the casting area must be reserved for process operations, making it impossible to use a fixed enclosed hood for fume capture. Finally, existing exhaust gas capture equipment requires a large ventilation capacity, resulting in high initial investment and high energy consumption, which is detrimental to the green, low-carbon, 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 flue gas capture method, which can specifically adopt the following technical solutions:

[0004] The ground pouring and cooling fume capture method of the present invention is realized by combining a fume capture hood, and is characterized by:

[0005] The combined fume hood comprises a door-type telescopic hood arranged on the ground, a circulating exhaust port and a dust removal and purification exhaust port being arranged in the middle of the door-type telescopic hood, and a rolling shutter door and a circulating air supply pipe being arranged at the end of the door-type telescopic hood; there are two circulating exhaust ports, and the circulating air supply pipe is provided with a plurality of circulating air supply ports that supply air into the door-type telescopic hood, 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 provided 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 that supply air into the door-type telescopic hood are provided 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 provided on it; the dust removal and purification exhaust port is connected to the dust removal and purification device through a sliding sealing pipe mechanism;

[0006] The capture method comprises:

[0007] 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 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 start sand box pouring. The air jet formed by the pouring air supply port of the suspension cover sends the smoke generated by pouring and the molten iron ladle into the door-type telescopic cover. The smoke is captured by the air curtain formed in the door-type telescopic cover and gathers towards the middle and rises. 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;

[0008] 2) Cooling condition: 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 flow from 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. 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 outlet, and is discharged after the dust removal and purification meet the standards;

[0009] 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.

[0010] The door-type telescopic cover is composed of a rigid exhaust section, a rigid end section and a telescopic section. 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.

[0011] The bottoms of the rigid exhaust section, rigid end section and telescopic section are all provided with walking wheels, the circulating air outlet and 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.

[0012] 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-shaped telescopic cover; the circulating air supply pipe, and the connecting line of the circulating air outlet and the dust removal and purification air outlet are perpendicular to the telescopic tubes.

[0013] Linear guide rails are provided at both ends of the top of the door-type telescopic cover. 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.

[0014] The angles between the air supply directions of the circulation air supply port and the pouring air supply port and the horizontal plane are both 30-50°.

[0015] The ground pouring and cooling flue gas capture method provided by the present invention is realized by a combined flue gas 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 flue gas can be quickly captured and enter the telescopic hood for purification treatment, which solves the disadvantage that the traditional fixed closed hood affects the pouring operation; the above-mentioned 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. It can cover a larger area, improve the flue gas capture effect during the sand box cooling process, and avoid 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 air mode of the hood, the wind curtain formed by the circulating wind effectively increases the wind speed of the cross section inside the hood, thereby improving the flue gas capture effect and reducing the air volume processed by the dust collector, achieving the effects of efficient capture, low-carbon operation, and reduced initial investment and operating costs of equipment.

[0016] This invention effectively reduces the spread of dust-laden fumes generated during pouring and flask cooling within the foundry. This prevents the health hazards of stagnant fumes to personnel entering the hood for maintenance, caused by low cross-sectional wind speeds, and the environmental damage caused by fumes escaping into the workshop when the hood contracts. Statistics show that this invention can reduce ventilation volume by approximately 50% during pouring and by approximately 80% during cooling. This not only reduces the system's operating energy consumption, but also lowers initial investment and maintenance costs, achieving significant green and low-carbon benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the casting working conditions of the combined fume capture hood described in the present invention.

[0018] Figure 2 It is a three-dimensional diagram of the contraction working condition of the combined fume capture hood described in the present invention.

[0019] Figure 3 yes Figure 1 Elevation drawing of .

[0020] Figure 4 yes Figure 2 Top view of .

[0021] Figure 5 yes Figure 3 AA section view in.

[0022] Figure 6 yes Figure 4 BB cross-section diagram in.

[0023] Figure 7 It is an airflow organization diagram of the present invention during the pouring operation. DETAILED DESCRIPTION

[0024] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific working process. However, the protection scope of the present invention is not limited to the following embodiment.

[0025] 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.

[0026] Specifically, the door-type telescopic cover 1 is set on the ground slide rail and consists 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 the rigid end section 12 on one side.

[0027] The top of the rigid exhaust section 11 is provided with an exhaust port, specifically three of which are a dust removal and purification exhaust port 3, and the other two are circulating exhaust ports 4. The three are arranged in sequence along the horizontal direction of the cover body. The top of each rigid end section 12 is provided with a horizontal circulating air supply pipe 5, 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 center 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 multiple circulating air supply ports that supply air to the door-type telescopic cover 1. When the circulation fan 7 is turned on, the airflow from the circulating air supply duct 5 at both ends of the hood is directed downward at a certain angle, blowing the smoke rising due to buoyancy within the hood to the exhaust port at the top of the rigid exhaust section 11 (forming an air curtain that increases the wind speed across the cross-sectional area within the hood). Typically, the air flow direction of the circulating air supply port on the circulating air supply duct 5 is at an angle of 30-50° to the horizontal, and the outlet air speed of the circulating air supply port is 6-12 m / s. Furthermore, a storage box for the rolling shutter is mounted on the top of the rigid end section 12.

[0028] The above-mentioned dust removal and purification exhaust port 3 is connected to the dust removal and purification device through a sliding sealing pipe mechanism, which is used to discharge the flue gas in the door-type telescopic cover 1 to the dust removal and purification device and to 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 the longitudinal through groove is provided with a sealing belt that is adsorbed by negative pressure; it also includes a movable air duct joint 32 arranged at the dust removal and purification exhaust port 3, and the movable air duct joint 32 includes a pipe joint connected to the outlet pipe of the dust removal and purification exhaust port 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.

[0029] The suspended 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 suspended 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, a horizontal linear guide 8 is provided at both ends of the top of the door-type telescopic hood 1. The linear guide 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 suspended hood 2 can move according to the specific sand box pouring position 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 into the door-type telescopic hood 1, and the pouring return air pipe 23 is provided with a pouring return air port opening downward. Typically, the angle between the air supply direction of the pouring air inlet and the horizontal plane is 30-50°. During use, the suspension cover 2 is adjusted above the pouring sand box, the ladle hanging rope is positioned between the pouring air supply pipe 22 and the pouring return air pipe 23, the exhaust fan 21 is started, and pouring is carried out. A large amount of high-temperature smoke and dust evaporates upward and is captured by the pouring return air inlet. The exhaust fan 21 extracts the pouring smoke from the pouring return air pipe 23 and sends it out of the pouring air supply pipe 22, forming an air supply jet that entrains the pouring smoke and enters the door-type telescopic cover 1. The smoke 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 airflow.

[0030] The ground pouring and cooling smoke capture method of the present invention comprises:

[0031] 1) Pouring Condition: Move the telescopic door 1 near the flask to be poured. Use a crane to hoist the ladle to the top of the flask. Move the suspension hood 2 on that side along the linear guide 8 to above the ladle, positioning the ladle hoist rope in the middle of the suspension hood 2. Simultaneously, lower the roller shutter door on the other side of the telescopic door 1 to seal the opening. After turning on the exhaust fan 21 of the suspension hood 2 and the circulating fan 7 of the telescopic door 1, flask pouring begins. The air jets formed by the pouring air inlets of the suspension hood 2 draw the fumes generated by the pouring and the ladle into the telescopic door 1. These fumes are captured by the high-speed air curtain formed by the circulating air inlets at both ends of the telescopic door 1. The fumes within the hood gather toward the center and rise upward. A portion of the fumes return to the telescopic door 1 through the circulating exhaust outlet 4 and circulating air duct 5. The remaining portion enters the dust removal and purification device through the dust removal and purification outlet 3, where they are discharged after meeting dust removal and purification standards.

[0032] 2) Cooling Condition: When cooling the sand box, the rolling shutter doors at both ends are lowered to form a closed space around the door-type telescopic cover 1. The circulating fan 7 is turned on, forming a high-speed air curtain from the circulating air supply ducts 5 at both ends. The exhaust gas released from the sand box is captured by the high-speed air curtain and gathered in the center, rising upward. A portion of the exhaust gas returns to the door-type telescopic cover 1 through the circulating air outlet 4 and the circulating air supply duct 5, while the remaining portion enters the dust removal and purification device through the dust removal and purification outlet 3. After dust removal and purification, it is discharged after meeting the standards. Since the entire door-type telescopic cover 1 is in a closed state, the required exhaust volume is relatively small. The dust removal and purification fan frequency is adjusted to reduce the ventilation volume, thereby reducing operating energy consumption.

[0033] 3) Non-operating conditions: When there is no pouring and cooling in the pouring area, the door-type telescopic cover 1 is retracted together under the action of the travel wheel drive device, providing more operating space for process operations.

[0034] 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”, and “outside” are based on the orientation or positional relationships shown in the accompanying 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 cannot be understood as a limitation on the present invention.

Claims

1. A method for collecting ground pouring and cooling fumes, achieved by combining a fume collection hood, characterized in that: The combined fume hood comprises a door-type telescopic hood arranged on the ground, a circulating exhaust port and a dust removal and purification exhaust port being arranged in the middle of the door-type telescopic hood, and a rolling shutter door and a circulating air supply pipe being arranged at the end of the door-type telescopic hood; there are two circulating exhaust ports, and the circulating air supply pipe is provided with a plurality of circulating air supply ports that supply air into the door-type telescopic hood, 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 provided 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 that supply air into the door-type telescopic hood are provided 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 provided on it; 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 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 start sand box pouring. The air jet formed by the pouring air supply port of the suspension cover sends the smoke generated by pouring and the molten iron ladle into the door-type telescopic cover. The smoke is captured by the air curtain formed in the door-type telescopic cover and gathers towards the middle and rises. 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 condition: 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 flow from 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. 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 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 ground pouring and cooling fume capture method 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. 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, rigid end section and telescopic section are all provided with walking wheels, the circulating air outlet and 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-shaped telescopic cover; the circulating air supply pipe, and the connecting line of the circulating air outlet and the dust removal and purification air outlet are perpendicular to the telescopic tubes.

5. The ground pouring and cooling fume capture method according to claim 1, characterized in that: Linear guide rails are provided at both ends of the top of the door-type telescopic cover. 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 circulation air supply port and the pouring air supply port and the horizontal plane are both 30-50°.

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