Reduction furnace exhaust gas treatment system and method

Abstract

The present invention discloses a reduction furnace exhaust gas treatment system and method, which relates to the field of exhaust gas treatment technology. High-temperature exhaust gas enters a spiral cooling tube and is cooled by a low-pressure coolant. The coolant evaporates and condenses on the heat dissipation fins, and circulates back to the cooling pool. The cooled exhaust gas enters a water washing barrel, is fully mixed with water, and is further driven by an impeller to flow the exhaust gas. The exhaust gas after water washing enters a filter chamber and is filtered again by a filter element. As the air permeability of the filter element decreases, the internal pressure of the water washing barrel increases. The pressure increase triggers the sedimentation trigger tube to contact the trigger disk, activates the pressure relief solenoid valve, releases the internal pressure of the water washing barrel, and sounds an alarm. The paddle plate and separation paddle rotate the disk to separate the sediment. Through the action of centrifugal force and gravity, silicon powder and solid matter enter the outer cover. The separated silicon powder and solid matter enter the separation filter cartridge, accumulate at the dust collection port, and are discharged into the collection pool by the circulation motor and discharge screw.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a reduction furnace waste gas treatment system and method. Background Art

[0002] Existing reduction furnace exhaust gas treatment systems typically use a simple water washing method to purify the exhaust gas, which has significant disadvantages. Simple water washing methods are difficult to completely remove harmful substances in the exhaust gas, resulting in the exhaust gas being discharged potentially causing environmental pollution. In addition, most existing equipment lacks pressure control and solid matter separation mechanisms, resulting in problems such as clogging, low efficiency, and maintenance difficulties during equipment operation. In response to these shortcomings of the existing technology, this application designs a reduction furnace exhaust gas treatment system, which aims to address the deficiencies in the existing technology and improve the overall effect of exhaust gas treatment and the operational stability of the system. Summary of the Invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a reduction furnace exhaust gas treatment system, comprising a water washing barrel, a plurality of discharge outlets are provided at the bottom of the water washing barrel, and a sealing bottom plate is fixedly and sealedly provided at the bottom of the water washing barrel, and a dial plate is rotatably installed on the sealing bottom plate for separating solid matter in the liquid; an air intake pipe is provided at the axis center inside the water washing barrel, and a sedimentation trigger tube is sleeved on the outer surface of the air intake pipe, and the bottom position of the air intake pipe is fixed to the inner wall of the water washing barrel through a stable frame, and a trigger disk that is in conductive contact with the sedimentation trigger tube is fixedly installed on the stable frame, and the bottom end of the air intake pipe is fixedly connected to an impeller booster chamber, and an impeller machine is rotatably installed inside the impeller booster chamber, and the impeller machine is fixed to the output shaft of the planetary gearbox, and the input shaft of the planetary gearbox is fixed to the dial plate.

[0004] Preferably, the outer shell of the planetary gearbox is fixed on the impeller booster chamber, the water washing bucket is located on the outside of the discharge outlet, the fixed sealing sleeve is provided with an outer shell cover, a separation paddle rotating disk is rotatably mounted on the inner wall of the outer shell cover, a plurality of separation paddles are arranged in a circular array on the separation paddle rotating disk, a discharge countersunk nozzle is provided on the outer shell cover, and a drive motor is fixedly mounted on the lower surface of the outer shell cover, and the output shaft of the drive motor is fixedly matched with the paddle plate and the separation paddle rotating disk.

[0005] Preferably, a filter chamber is fixedly connected to the top of the water washing barrel, a filter element is fixedly installed on the inner wall of the filter chamber, a dust cover is also fixed on the top of the filter chamber, a gap for ventilation is provided between the dust cover and the filter chamber, and a pressure relief solenoid valve is also provided on the top of the water washing barrel.

[0006] It also includes a cooling pool, which is fixedly connected to a heat dissipation fin. The heat dissipation fin is hollow as a whole. The entire hollow space of the heat dissipation fin is connected to the interior of the cooling pool. Coolant is provided inside the cooling pool, and the cooling pool and the heat dissipation fin are set at negative pressure.

[0007] Preferably, a spiral cooling tube is provided in the cooling pool, both ends of the spiral cooling tube extend to the outside of the cooling pool, one end of the spiral cooling tube is connected to the air intake pipe, and the other end of the spiral cooling tube is connected to the exhaust gas outlet. A fan is provided on the side of the heat dissipation fin for cooling the heat dissipation fin.

[0008] It also includes a separation filter cartridge, a separation water inlet pipe is coaxially arranged inside the separation filter cartridge, both ends of the separation water inlet pipe extend to the outside of the separation filter cartridge, and a through hole is provided at the position of the separation water inlet pipe inside the separation filter cartridge, and a tee pipe is provided at both ends of the separation water inlet pipe, and the tee pipe is connected to the top of the inside of the water washing bucket through a return pipe, and a water pump is installed in series on the return pipe.

[0009] Preferably, the separation filter cartridge is symmetrically provided with an inlet and a dust collecting port, wherein the inlet is connected to the discharge nozzle, the dust collecting port is fixedly and sealedly connected to a dust collecting chamber, a discharge screw is rotatably installed in the dust collecting chamber, and one end of the dust collecting chamber is connected to the inside of the collection pool.

[0010] Preferably, the discharge screw is driven to rotate by a circulation motor, and the output shaft of the circulation motor also drives the water pump to operate through a transmission belt.

[0011] Preferably, the cooling pool is fixedly mounted on the first frame, and the outer shell, the separation filter cartridge and the circulation motor are fixedly mounted on the second frame.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention designs a perfect liquid reflux and recycling mechanism. The water pump transports the liquid in the separation filter cartridge back to the water washing barrel through the reflux pipe, realizing the recycling of the liquid. This not only saves water resources, but also ensures the continuous operation of the system and improves the overall environmental performance of the equipment; (2) The present invention monitors the pressure inside the water washing barrel in real time through the cooperation of the sedimentation trigger tube and the trigger disk. When the air permeability of the filter element decreases and the pressure rises, the sedimentation trigger tube automatically starts the pressure relief solenoid valve to release excess pressure and prevent the water washing barrel from being damaged due to excessive pressure. At the same time, the system also has an alarm function to prompt the operator to replace the filter element or perform maintenance in time; (3) The rotation of the paddle plate and the separation paddle rotating disk of the present invention drives the sediment inside the water washing barrel to separate. Through the action of centrifugal force and gravity, the silicon powder and solid matter are separated from the exhaust gas and collected into the dust collecting chamber through the discharge port and the separation filter cartridge. The circulation motor and the discharge screw further discharge the collected solid matter into the collection pool to ensure the cleanliness and efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2This is a schematic diagram of the structure of the spiral cooling tube of the present invention.

[0015] Figure 3 It is a schematic diagram of the heat dissipation fin structure of the present invention.

[0016] Figure 4 It is a schematic diagram of the internal structure of the water washing bucket of the present invention.

[0017] Figure 5 Schematic diagram of the water level at the settlement trigger pipe of the present invention.

[0018] Figure 6 For the present invention Figure 4 Schematic diagram of the structure at point B in the middle.

[0019] Figure 7 This is a structural diagram of the separation filter cartridge of the present invention.

[0020] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point C in the middle.

[0021] Figure 9 This is a structural diagram of the sealing bottom plate of the present invention.

[0022] Figure 10 It is a structural schematic diagram of the transmission belt of the present invention.

[0023] In the figure: 101-first rack; 102-cooling pool; 103-heat dissipation fins; 104-fan; 105-spiral cooling pipe; 106-intake pipe; 107-washing bucket; 108-dust cover; 109-filter element; 110-filter chamber; 111-sedimentation trigger tube; 112-stabilizing frame; 113-trigger plate; 114-impeller booster chamber; 115-impeller; 116-planetary gearbox; 117-paddle wheel plate; 118-housing cover; 119-separation paddle; 1 20-Second frame; 121-Discharge outlet; 122-Sealing bottom plate; 123-Discharge nozzle; 124-Separation paddle rotary disk; 125-Drive motor; 126-Pressure relief solenoid valve; 127-Return pipe; 128-Water pump; 129-Separation water inlet pipe; 130-Tee pipe; 131-Inlet sink; 132-Separation filter cartridge; 133-Dust collection port; 134-Dust collection chamber; 135-Discharge screw; 136-Circulation motor; 137-Collection tank; 138-Transmission belt. DETAILED DESCRIPTION

[0024] The following combination Figures 1-10 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0025] The present invention provides a reduction furnace waste gas treatment system, comprising a water washing barrel 107, wherein a plurality of discharge ports 121 are provided at the bottom of the water washing barrel 107, and a sealing bottom plate 122 is fixedly and sealedly provided at the bottom of the water washing barrel 107, and a paddle plate 117 is rotatably mounted on the sealing bottom plate 122 for separating solid matter from liquid; an air intake pipe 106 is provided at the axis center inside the water washing barrel 107, and a sedimentation trigger tube 111 is sleeved on the outer surface of the air intake pipe 106, and the bottom position of the air intake pipe 106 is fixed to the inner wall of the water washing barrel 107 by a stable frame 112, and a trigger disk 113 is fixedly mounted on the stable frame 112 for conductive contact with the sedimentation trigger tube 111, and the bottom end of the air intake pipe 106 is fixedly connected to an impeller boost chamber 114, and an impeller machine 115 is rotatably mounted inside the impeller boost chamber 114, and the impeller machine 115 is fixed to the output shaft of the planetary gearbox 116, and the input shaft of the planetary gearbox 116 is fixed to the paddle plate 117. The outer shell of the planetary gearbox 116 is fixed to the impeller pressurizing chamber 114. The water washing bucket 107 is located outside the discharge port 121. The fixed sealing sleeve is provided with an outer shell cover 118. A separation paddle rotating disk 124 is rotatably mounted on the inner wall of the outer shell cover 118. A plurality of separation paddles 119 are arranged in a circular array on the separation paddle rotating disk 124. A discharge countersunk nozzle 123 is provided on the outer shell cover 118. A drive motor 125 is fixedly mounted on the lower surface of the outer shell cover 118. The output shaft of the drive motor 125 is fixedly engaged with the paddle plate 117 and the separation paddle rotating disk 124. The top of the water washing bucket 107 is fixedly connected to the filter chamber 110. The inner wall of the filter chamber 110 is fixedly mounted with a filter element 109. A dust cover 108 is also fixed to the top of the filter chamber 110. A gap for ventilation is provided between the dust cover 108 and the filter chamber 110. A pressure relief solenoid valve 126 is also provided at the top of the water washing bucket 107.

[0026] The cooling system further includes a cooling pool 102, to which heat sink fins 103 are fixedly connected. The heat sink 103 is hollow, and the entire hollow space of the heat sink 103 is connected to the interior of the cooling pool 102. Coolant is provided inside the cooling pool 102, and the interiors of the cooling pool 102 and the heat sink 103 are negatively pressurized. A spiral cooling tube 105 is provided within the cooling pool 102, with both ends of the spiral cooling tube 105 extending to the outside of the cooling pool 102. One end of the spiral cooling tube 105 is connected to the air intake pipe 106, and the other end of the spiral cooling tube 105 is connected to the exhaust gas outlet. A fan 104 is provided on the side of the heat sink 103 to cool the heat sink 103.

[0027] The filter cartridge 132 also includes a separation filter cartridge 132, wherein a separation water inlet pipe 129 is coaxially arranged inside the separation filter cartridge 132. Both ends of the separation water inlet pipe 129 extend to the outside of the separation filter cartridge 132, and a through hole is provided at the position of the separation water inlet pipe 129 inside the separation filter cartridge 132. A tee pipe 130 is provided at both ends of the separation water inlet pipe 129. The tee pipe 130 is connected to the top of the interior of the water washing bucket 107 through a return pipe 127. A water pump 128 is installed in series on the return pipe 127. An inlet sink 131 and a dust collecting port 133 are symmetrically arranged on the separation filter cartridge 132, wherein the inlet sink 131 is connected to the discharge sink nozzle 123. A dust collecting chamber 134 is fixedly and sealedly connected to the dust collecting port 133. A discharge screw 135 is rotatably installed in the dust collecting chamber 134. One end of the dust collecting chamber 134 is connected to the interior of the collection tank 137. The discharge screw 135 is driven to rotate by the circulation motor 136, and the output shaft of the circulation motor 136 also drives the water pump 128 through the transmission belt 138. The cooling pool 102 is fixedly mounted on the first frame 101, and the outer shell 118, the separation filter cartridge 132 and the circulation motor 136 are fixedly mounted on the second frame 120.

[0028] The working principle of a reduction furnace exhaust gas treatment system disclosed in the present invention is as follows: the exhaust gas generated in the reduction furnace enters the spiral cooling tube 105, and then flows forward in the spiral cooling tube 105, and needs to pass through a low-temperature coolant in the spiral section of the spiral cooling tube 105. The coolant is in a low-pressure state, so the boiling point of the coolant is low (for example, if water is used, then the maximum temperature of the environment in which the spiral cooling tube 105 is located is 100 degrees Celsius. If the pressure is reduced, the maximum temperature will be further reduced). At this time, the coolant cools the high-temperature exhaust gas. The high-temperature exhaust gas heats the coolant, causing the coolant to evaporate. The evaporated coolant will float upward, thereby forming condensation on the heat sink 103. This is because the heat sink 103 is at a low temperature under the action of the fan 104, so the evaporated coolant will form water droplets on the heat sink 103. As the volume of the water droplets continues to increase, they will fall back down into the cooling pool 102.

[0029] The cooled exhaust gas flows along the air inlet pipe 106 into the water washing barrel 107 for water washing, so that the harmful substances in the exhaust gas are precipitated. The exhaust gas flows out at the bottom of the water washing barrel 107 through the air inlet pipe 106 and is then fully mixed with water. In this process, the exhaust gas will pass through the impeller 115, so it is necessary to start the drive motor 125. The output shaft of the drive motor 125 drives the dial plate 117 and the separation paddle rotating disk 124 to rotate. The rotation of the dial plate 117 will drive the input shaft of the planetary gearbox 116 to rotate, so that the output shaft of the planetary gearbox 116 drives the impeller 115 to rotate, making it easier for the exhaust gas inside the air inlet pipe 106 to enter the water washing barrel 107. The filtered exhaust gas enters the filter chamber 110, is then filtered again through the filter element 109, and is then discharged. As time goes by in this process, the air permeability of the filter element 109 will gradually decay. When the air permeability of the filter element 109 is less than the air intake of the air intake pipe 106, the pressure inside the water washing bucket 107 will increase, causing the air pressure to squeeze the inside of the sedimentation trigger tube 111, causing the horizontal surface inside the sedimentation trigger tube 111 to rise, and the volume of the space without water inside the sedimentation trigger tube 111 to decrease, causing the buoyancy of the sedimentation trigger tube 111 to decrease. Under the action of gravity, the sedimentation trigger tube 111 sinks downward, and the sedimentation trigger tube 111 will contact the trigger disk 113. After the trigger disk 113 contacts the sedimentation trigger tube 111, a closed loop will be formed, and the pressure relief solenoid valve 126 will be started at this time. The pressure relief solenoid valve 126 opens to release the pressure inside the water washing bucket 107 to prevent damage caused by excessive pressure inside the water washing bucket 107, and an alarm can also be issued at the same time.

[0030] The rotation of the paddle plate 117 will cause the sediment inside the washing barrel 107 to rotate (including silicon powder and solid matter), so that the silicon powder and solid matter are separated from the water, and under the action of gravity and centrifugal force, they will enter the outer shell 118 through the discharge port 121. Because the separation paddle rotating disk 124 is also in a rotating state, the separation paddle 119 will also paddle these separated silicon powder and solid matter to move to the inner wall edge of the outer shell 118, and then these silicon powder and solid matter will pass through the discharge sink mouth 123 and the inlet sink mouth 131, along the separation filter cylinder The tangent of the inner wall of 132 enters the separation filter barrel 132 and generates rotation in the separation filter barrel 132. These rotating solid substances and silicon powder will always adhere to the inner wall edge of the separation filter barrel 132 under the action of centrifugal force. When they move to the dust collecting port 133, they will accumulate inside the dust collecting chamber 134. At this time, the circulation motor 136 is started, and the output shaft of the circulation motor 136 drives the discharge screw 135 to rotate. The discharge screw 135 rotates to discharge the silicon powder and solid substances inside the dust collecting chamber 134 into the collection pool 137 for collection.

[0031] When the circulation motor 136 is started, the water pump 128 will be driven to work through the transmission belt 138. The water pump 128 will transport the liquid inside the tee pipe 130 through the return pipe 127 to the water washing barrel 107 to form a circulation. The liquid inside the tee pipe 130 comes from the separation water inlet pipe 129. Since a through hole is provided in the middle of the separation water inlet pipe 129, liquid also enters the separation filter barrel 132 along with the silicon powder and solid matter. These liquids will be separated from the silicon powder and solid matter due to centrifugal force, and thus concentrated at the axis of the separation filter barrel 132. Due to the action of the water pump 128, the inside of the separation water inlet pipe 129 is in a negative pressure state, so these liquids will enter the separation water inlet pipe 129, and then pass through the tee pipe 130 and the return pipe 127 into the water washing barrel 107.

Claims

1. A reduction furnace exhaust gas treatment system, characterized by: The invention comprises a water washing bucket (107), wherein a plurality of discharge ports (121) are provided at the bottom of the water washing bucket (107), a sealing bottom plate (122) is fixedly and sealedly provided at the bottom of the water washing bucket (107), and a thumbwheel plate (117) is rotatably mounted on the sealing bottom plate (122) for separating solid matter from liquid; An air inlet pipe (106) is provided at the axis center inside the water washing barrel (107), and a sedimentation trigger tube (111) is sleeved on the outer surface of the air inlet pipe (106). The bottom position of the air inlet pipe (106) is fixed to the inner wall of the water washing barrel (107) through a stable frame (112), and a trigger disk (113) that is in conductive contact with the sedimentation trigger tube (111) is fixedly installed on the stable frame (112). The bottom end of the air inlet pipe (106) is fixedly connected to an impeller pressurization chamber (114), and an impeller (115) is rotatably installed inside the impeller pressurization chamber (114). The impeller (115) is fixed to the output shaft of the planetary gearbox (116), and the input shaft of the planetary gearbox (116) is fixed to the dial plate (117); The outer shell of the planetary gearbox (116) is fixed on the impeller pressurizing chamber (114), the water washing bucket (107) is located outside the discharge port (121), the fixed sealing sleeve is provided with an outer shell cover (118), a separation paddle rotating disk (124) is rotatably mounted on the inner wall of the outer shell cover (118), a plurality of separation paddles (119) are arranged in a circular array on the separation paddle rotating disk (124), a discharge sink nozzle (123) is provided on the outer shell cover (118), a driving motor (125) is fixedly mounted on the lower surface of the outer shell cover (118), and an output shaft of the driving motor (125) is fixedly matched with the paddle plate (117) and the separation paddle rotating disk (124); The top of the water washing bucket (107) is fixedly connected to a filter chamber (110), the inner wall of the filter chamber (110) is fixedly mounted with a filter element (109), a dust cover (108) is fixedly mounted on the top of the filter chamber (110), a gap for ventilation is provided between the dust cover (108) and the filter chamber (110), and a pressure relief solenoid valve (126) is also provided on the top of the water washing bucket (107); The air permeability of the filter element (109) will gradually decay. When the air permeability of the filter element (109) is less than the air intake of the air intake pipe (106), the pressure inside the water washing bucket (107) will increase, thereby causing the air pressure to squeeze the inside of the sedimentation trigger tube (111), causing the horizontal surface inside the sedimentation trigger tube (111) to rise, and the volume of the space without water inside the sedimentation trigger tube (111) to decrease, causing the buoyancy of the sedimentation trigger tube (111) to decrease. Under the action of gravity, the sedimentation trigger tube (111) sinks downward, and the sedimentation trigger tube (111) will contact the trigger disk (113). After the trigger disk (113) contacts the sedimentation trigger tube (111), a closed circuit is formed, and at this time, the pressure relief solenoid valve (126) is activated, and the pressure relief solenoid valve (126) opens to release the pressure inside the water washing bucket (107).

2. A reduction furnace exhaust gas treatment system according to claim 1, characterized in that: The cooling pool (102) is also provided with a heat dissipation fin (103) fixedly connected to the cooling pool (102). The heat dissipation fin (103) is hollow as a whole. The entire hollow space of the heat dissipation fin (103) is connected to the interior of the cooling pool (102). Coolant is provided inside the cooling pool (102), and the interiors of the cooling pool (102) and the heat dissipation fin (103) are negative pressure settings.

3. A reduction furnace exhaust gas treatment system according to claim 2, characterized in that: A spiral cooling tube (105) is provided in the cooling pool (102), with both ends of the spiral cooling tube (105) extending to the outside of the cooling pool (102), one end of the spiral cooling tube (105) being connected to the air inlet pipe (106), and the other end of the spiral cooling tube (105) being connected to the exhaust gas outlet, and a fan (104) being provided on the side of the heat dissipation fin (103) for cooling the heat dissipation fin (103).

4. A reduction furnace exhaust gas treatment system according to claim 3, characterized in that: The apparatus further comprises a separation filter cartridge (132), wherein a separation water inlet pipe (129) is coaxially arranged inside the separation filter cartridge (132), both ends of the separation water inlet pipe (129) extend to the outside of the separation filter cartridge (132), and a through hole is provided at a position of the separation water inlet pipe (129) inside the separation filter cartridge (132), and a tee pipe (130) is provided at both ends of the separation water inlet pipe (129), and the tee pipe (130) is connected to the top end of the washing bucket (107) through a return pipe (127), and a water pump (128) is installed in series on the return pipe (127).

5. A reduction furnace exhaust gas treatment system according to claim 4, characterized in that: The separation filter cartridge (132) is symmetrically provided with an inlet (131) and a dust collecting port (133), wherein the inlet (131) is connected to the discharge nozzle (123), and the dust collecting port (133) is fixedly and sealedly connected to a dust collecting chamber (134), a discharge screw (135) is rotatably installed in the dust collecting chamber (134), and one end of the dust collecting chamber (134) is connected to the interior of the collection pool (137).

6. A reduction furnace exhaust gas treatment system according to claim 5, characterized in that: The delivery screw (135) is driven to rotate by the circulation motor (136), and the output shaft of the circulation motor (136) also drives the water pump (128) to operate through the transmission belt (138).

7. A reduction furnace exhaust gas treatment system according to claim 6, characterized in that: The cooling pool (102) is fixedly mounted on the first frame (101), and the outer shell (118), the separation filter cartridge (132) and the circulation motor (136) are fixedly mounted on the second frame (120).

8. The method for treating exhaust gas from a reduction furnace according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the high-temperature exhaust gas first enters the spiral cooling tube (105), and the coolant cools the high-temperature exhaust gas; S2, the cooled exhaust gas enters the water washing barrel (107) through the air inlet pipe (106), flows out from the bottom of the water washing barrel and is fully mixed with water; S3, the washed exhaust gas enters the filter chamber (110) and is filtered again through the filter element (109); S4. When the internal pressure of the water washing bucket (107) increases, the liquid level inside the sedimentation trigger tube (111) rises, the buoyancy decreases, the trigger tube sinks and contacts the trigger disk (113), forming a closed circuit, activating the pressure relief solenoid valve (126), releasing the excess pressure inside the water washing bucket (107), preventing system damage and sounding an alarm; S5, the rotation of the paddle wheel plate (117) and the separation paddle rotating disk (124) separates the sediment inside the washing barrel (107), and then the sediment is separated from the water and transported to the collection tank (137); S6. The separated water flows back into the washing bucket (107).

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