Tail gas treatment system

Abstract

The utility model discloses a tail gas treatment system relates to tail gas purification technical field. Tail gas treatment system includes: furnace pressure control fan, cloth bag dust removal tower is equipped with the discharge port at the bottom of cloth bag dust removal tower, sprays tower, is equipped with the net gas export on sprays tower, tail gas access pipe, tail gas access pipe connects the air inlet end of furnace pressure control fan, first connecting pipe, connects the air outlet end of furnace pressure control fan and cloth bag dust removal tower, second connecting pipe, connects cloth bag dust removal tower and sprays tower, first pressure detection spare, the detection end of first pressure detection spare is connected on tail gas access pipe or is suitable for connecting on sintering kiln. Wherein, furnace pressure control fan is the frequency conversion adjustable fan and is electrically connected with first pressure detection spare, to adjust the frequency according to the detection result. This tail gas treatment system can efficiently capture and remove the dust, tar and harmful gas component in waste gas, purify the gas that can be discharged to the atmosphere, and does not affect the furnace pressure.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas purification technology, specifically to an exhaust gas treatment system. Background Technology

[0002] Many industrial production processes require the use of furnaces and kilns at high temperatures and under specific pressures to sinter materials, creating challenges in waste gas treatment. For example, during the sintering of lithium iron phosphate in a large rotary kiln, the exhaust gas contains dust, tar, protective gases, carbon dioxide, and water vapor. Direct discharge of this waste gas into the atmosphere damages the natural environment. Commonly used treatment methods include a combination of cyclone separators and spray towers, and a combination of gravity dust collectors and spray towers. However, these solutions suffer from poor gas-solid separation and dust blockage. Furthermore, the exhaust gas also affects the pressure within the furnace. Improving waste gas treatment methods warrants further investigation. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a tail gas treatment system that can filter dust particles and tar from waste gas, purify the gas, and obtain gas that can be directly discharged into the atmosphere. Furthermore, it does not affect the furnace pressure when the tail gas is discharged from the sintering kiln.

[0004] The exhaust gas treatment system according to an embodiment of this utility model includes: a furnace pressure control fan; a bag filter tower with a slag discharge port at its bottom; a spray tower with a clean gas outlet; an exhaust gas inlet pipe connected to the inlet end of the furnace pressure control fan; a first connecting pipe, one end of which is connected to the outlet end of the furnace pressure control fan, and the other end of which is connected to the bag filter tower; a second connecting pipe, one end of which is connected to the bag filter tower, and the other end of which is connected to the spray tower; and a first pressure detection element, the detection end of which is connected to the exhaust gas inlet pipe or adapted to be connected to a sintering kiln; wherein the furnace pressure control fan is a frequency-adjustable fan and is electrically connected to the first pressure detection element to adjust the frequency according to the detection result.

[0005] According to the exhaust gas treatment system of this utility model embodiment, exhaust gas is discharged from the sintering kiln and flows through the exhaust gas inlet pipe to the furnace pressure control fan. The first pressure detection device monitors the furnace pressure in real time and feeds back the pressure signal to the PLC. The PLC transmits a signal to control the furnace pressure control fan to adjust its own frequency, thereby precisely controlling the furnace pressure. Subsequently, the exhaust gas flows through the outlet of the furnace pressure control fan to the first connecting pipe, and then flows into the bag filter tower. In the bag filter tower, dust and tar in the exhaust gas are intercepted, achieving gas-solid separation. Finally, the gas passing through the bag filter tower goes through the second connecting pipe to the spray tower. The spray tower uses a spray water curtain to absorb the residual dust and soluble gases in the exhaust gas again. Thus, the exhaust gas is purified into gas that can be directly discharged into the atmosphere.

[0006] In this application, the exhaust gas treatment system is equipped with a furnace pressure control fan at the exhaust gas inlet. On the one hand, by controlling the air pressure generated by the fan, sufficient flow force is provided for the exhaust gas, allowing it to flow quickly to the bag filter tower and spray tower, avoiding the problems of blockage and poor separation effect caused by excessively low airflow velocity. On the other hand, the furnace pressure control fan draws the exhaust gas from the sintering kiln, and in conjunction with the pressure detection and control of the first pressure detection element, the stability of the pressure control in the furnace and the smoothness of exhaust are ensured. This helps to guarantee the sintering quality of the materials in the sintering kiln.

[0007] In addition, in this application, the exhaust gas first enters the bag filter tower, which can filter out the tar and prevent the tar from entering the spray tower with the exhaust gas and generating a large amount of foam. Moreover, since the bag filter tower is also effective in removing particulate impurities, it avoids the possibility of particulate impurities entering the spray tower and clogging the spray heads.

[0008] In some embodiments, the first connecting pipe is inclined downward in the direction toward the bag filter tower.

[0009] In some embodiments, at least a portion of the exhaust gas inlet pipe is a telescopic pipe with adjustable length.

[0010] In some embodiments, the telescopic tube is a flexible metal tube.

[0011] In some embodiments, the exhaust gas treatment system further includes a second pressure detection element, the detection end of which is connected to the second connecting pipe.

[0012] In some embodiments, the exhaust gas inlet pipe is inclined upward in the direction toward the furnace pressure control blower.

[0013] In some embodiments, the spray tower is provided with spray heads, and the bottom of the spray tower is provided with a water collection tank; The exhaust gas treatment system further includes a circulation pump, one end of which is connected to the water collection tank and the other end of which is connected to the spray head.

[0014] In some embodiments, the water collection tank also has a sewage outlet, and the exhaust gas treatment system further includes: a sewage pump, the inlet of which is connected to the sewage outlet; and a water supply port on the spray tower.

[0015] In some embodiments, there are at least two spray heads arranged at intervals along the height direction; the connection port of the second connecting pipe to the spray tower is located below the spray head, and the clean air outlet is located at the top of the spray tower.

[0016] In some embodiments, the exhaust gas treatment system further includes: a bypass pipe connected to the exhaust gas inlet pipe; and a bypass control valve disposed on the bypass pipe.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the exhaust gas treatment system according to an embodiment of this application; Figure 2 This is an enlarged view of the connection between the bag filter tower and the furnace pressure control fan in some embodiments of this application; Figure 3 This is an enlarged view of the connection between the furnace pressure control fan and the sintering kiln in some embodiments of this application.

[0019] Figure label: Exhaust gas treatment system 10, Angle A, Furnace pressure control fan 1, air inlet 11, air outlet 12. Baghouse dust collector 2, slag discharge port 21 3. Spray tower; 31. Clean air outlet; 32. Spray head; 33. Water collection tank; 33. Sewage outlet; 331. Water inlet; 34. Sewage gas inlet; 35. Exhaust gas inlet pipe 4, telescopic pipe 41, 5. First connecting pipe; 6. Second connecting pipe; 7. First pressure detection element; 8. Sintering kiln. Second pressure testing component 9 Circulating pump 20, exhaust fan 30, sewage pump 40, water inlet 42. Bypass pipe 50, bypass control valve 60. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The following is for reference. Figures 1-3 Description of exhaust gas treatment system 10 according to an embodiment of the present utility model.

[0024] The exhaust gas treatment system 10 according to an embodiment of the present invention is described, with reference to... Figure 1 It includes: furnace pressure control fan 1, bag filter tower 2, spray tower 3, exhaust gas inlet pipe 4, first connecting pipe 5, second connecting pipe 6, and first pressure detection element 7.

[0025] The sintering kiln 8 establishes a tail gas flow channel with the furnace pressure control fan 1 through the tail gas inlet pipe 4. The tail gas inlet pipe 4 is connected to the air inlet 11 of the furnace pressure control fan 1 and is used to transport waste gas.

[0026] The baghouse dust collector 2 is a device that uses fiber filter media to capture particulate matter in dust-laden gas, achieving gas purification and dust recovery. In this application, the baghouse dust collector 2 can adopt the structure of a baghouse dust collector known in the prior art, and is not specifically limited here. In some specific embodiments, the baghouse dust collector 2 operates as follows: after the dust-laden gas enters through the inlet of the baghouse dust collector 2, larger dust particles first settle directly to the bottom in the ash hopper area due to the sudden drop in airflow velocity and inertia. Fine dust particles rise with the airflow and enter the filter bag chamber. Through multiple physical effects such as inertial collision, interception, diffusion, and electrostatic adsorption, the dust particles are firmly captured on the surface of the filter bags, while the purified air passes through the filter media into the clean air chamber. Of course, the fiber filter media can not only efficiently filter exhaust gas containing gas-solid mixtures, but also trap dust and tar in the exhaust gas on the surface of the filter bags.

[0027] like Figure 1 As shown, the bottom of the bag filter tower 2 is provided with a slag discharge port 21. The exhaust gas from the furnace pressure control fan 1 passes through the first connecting pipe 5. One end of the first connecting pipe 5 is connected to the outlet end 12 of the furnace pressure control fan 1, and the other end of the first connecting pipe 5 is connected to the bag filter tower 2. The exhaust gas comes to the bag filter tower 2 from the first connecting pipe 5. The exhaust gas adsorbed by the bag filter tower 2 removes a large amount of dust particles and tar residue. The residue is discharged through the slag discharge port 21.

[0028] One end of the second connecting pipe 6 is connected to the bag filter tower 2, and the other end is connected to the spray tower 3. The spray tower 3 is equipped with a clean gas outlet 31. The exhaust gas adsorbed by the bag filter tower 2 comes to the spray tower 3 through the second connecting pipe 6. The spray water curtain formed by the spray tower 3 further purifies the trace dust and soluble gases in the remaining exhaust gas. The purified gas is discharged into the atmosphere through the clean gas outlet 31.

[0029] Furthermore, the exhaust gas treatment system 10 also includes a first pressure detection element 7. The detection end of the first pressure detection element 7 is connected to the exhaust gas inlet pipe 4 or is adapted to be connected to the sintering kiln 8, and is used to detect the pressure inside the exhaust gas inlet pipe 4 or at the outlet of the sintering kiln 8. Since the exhaust gas inlet pipe 4 is used to connect to the sintering kiln 8, for example, it can be connected to the kiln head or kiln tail of the sintering kiln 8, the gas pressure in the exhaust gas inlet pipe 4 is approximately equal to the gas pressure inside the kiln. Therefore, when the detection end of the first pressure detection element 7 is connected to the exhaust gas inlet pipe 4, the pressure inside the kiln can also be detected.

[0030] Among them, the furnace pressure control blower 1 is a frequency-adjustable blower and is electrically connected to the first pressure detection element 7 to adjust the frequency according to the detection result.

[0031] Specifically, when the exhaust gas is discharged from the sintering kiln 8 and flows through the exhaust gas inlet pipe 4, the first pressure detection element 7 detects the exhaust gas pressure in real time and feeds the pressure information back to the furnace pressure control fan 1. The automatic control system of the furnace pressure control fan 1 automatically adjusts the rotation frequency of the furnace pressure control fan 1 according to the pressure change, thereby dynamically controlling the pressure and exhaust gas emission rate into the dust collector bag 2. The first pressure detection element 7 and the automatic control system of the furnace pressure control fan 1 work together to further improve the accuracy and response speed of pressure detection and the furnace pressure control fan 1, realize intelligent and precise control of furnace pressure, improve exhaust gas treatment efficiency and the stability of the entire system operation, and significantly reduce energy consumption and operation and maintenance costs.

[0032] Compared to existing technologies that control furnace pressure by controlling the input of a protective gas, i.e., nitrogen, and only install an exhaust fan at the end of the exhaust gas treatment system to drive the flow of exhaust gas and ensure smooth exhaust, or install a butterfly valve at the exhaust gas inlet to control the exhaust gas emission rate by controlling the valve opening, in this application, the exhaust gas treatment system 10 is equipped with a furnace pressure control fan 1 at the exhaust gas inlet, and a frequency-adjustable fan is selected. Combined with a first pressure detection device and PLC control, when the furnace pressure is too high, the first pressure detection device feeds a signal to the PLC, and the PLC transmits a signal to control the furnace pressure control fan 1 to increase its frequency, accelerating the exhaust gas flow from the furnace. The gas is discharged from the furnace body, thus reducing the furnace pressure. Conversely, when the furnace pressure is too low, the PLC sends a signal to reduce the frequency of the furnace pressure control fan 1, slowing down the gas discharge speed and causing more gas to remain inside the furnace, achieving a pressurization effect. Therefore, in conjunction with the control of the nitrogen input, the positive pressure inside the furnace can be precisely controlled, preventing insufficient pressure from increasing the possibility of external gas intrusion, and also preventing excessive pressure from causing volatile gases generated during sintering to adhere to the product surface, ensuring the sintering quality of the material. At the same time, frequency control is faster than valve opening control and avoids material accumulation. Furthermore, the coordination between the furnace pressure control fan 1 and the terminal exhaust fan provides sufficient flow power to the exhaust gas, allowing it to flow quickly to the bag filter tower 2 and the spray tower 3, preventing blockages and poor separation due to low airflow velocity.

[0033] For example, the exhaust gas treatment system 10 of this application is connected to the rotary kiln via the exhaust gas inlet pipe 4. During the sintering of lithium iron phosphate in the rotary kiln, it is necessary to strictly control the oxygen content in the sintering atmosphere to prevent the oxidation of ferrous ions into byproducts. A protective gas, such as nitrogen, is usually introduced from the tail of the kiln towards the head. The relative movement of the material and the protective gas generates a large amount of dust, resulting in the exhaust gas discharged from the head containing some lithium iron phosphate dust particles. The main components of the exhaust gas are nitrogen and carbon dioxide, and it also contains 1.0–3.5% water vapor and trace amounts of tar.

[0034] During the sintering of minerals (such as lithium iron phosphate, metal oxides, ceramic raw materials, etc.) in a rotary kiln, it is necessary to maintain a positive pressure environment inside the furnace. This is done by actively maintaining the furnace pressure higher than the external atmospheric pressure, preventing external air intrusion, stabilizing the reaction atmosphere inside the furnace, and ultimately ensuring sintering quality, efficiency, and product performance.

[0035] Therefore, the solution proposed in this application uses the furnace pressure control fan 1 and the furnace pressure setting self-adjustment control to adjust the rotation frequency of the furnace pressure control fan 1 in real time, thereby achieving stable control of the furnace pressure. This solves the problems of large fluctuations in the rotary kiln furnace pressure and poor exhaust smoothness, which is conducive to the timely discharge of volatiles from lithium iron phosphate sintering, thereby improving product performance.

[0036] In addition, in this application, the exhaust gas first enters the bag filter tower 2, which can filter out the tar and prevent the tar from entering the spray tower 3 with the exhaust gas and generating a large amount of foam. Moreover, since the bag filter tower 2 also has a good dust removal effect on particulate impurities, it avoids the possibility of particulate impurities entering the spray tower 3 and clogging the spray head 32.

[0037] Optionally, the first pressure sensing element 7 can be a pressure transmitter, pressure gauge, or differential pressure transmitter, etc. The filter bag material of the dust collector bag tower 2 can be: a high-temperature corrosion-resistant dust collector filter bag with polyphenylene sulfide (PPS) fiber as the base material and coated with a polytetrafluoroethylene (PTFE) microporous membrane, which can withstand high temperatures of 170℃ and is suitable for treating exhaust gas conditions of around 100℃, with a dust collection rate of over 99% and an exhaust dust concentration ≤10mg / m3.

[0038] In some embodiments, refer to Figure 2 The first connecting pipe 5 is connected at one end to the gas outlet 12 of the furnace pressure control machine 1 and at the other end to the bag filter tower 2, providing a channel for the flow of exhaust gas. The first connecting pipe 5 is inclined downward in the direction towards the bag filter tower 2.

[0039] Specifically, the exhaust gas flows into the first connecting pipe 5 via the furnace pressure control fan 1 and is then transported to the downstream bag filter tower 2. During this process, the inclined design of the first connecting pipe 5 allows dust in the exhaust gas to flow into the bag filter tower 2 with the aid of gravity, reducing material accumulation inside the pipe and allowing the dust to slide naturally downwards. This prevents the dust from stagnating at high points or depositing backwards, effectively reducing the risk of pipe blockage and corrosion. Furthermore, the exhaust gas contains small amounts of water vapor and tar; the inclined first connecting pipe 5 also guides the liquid downwards and discharges it, preventing liquid stagnation within the pipe and ensuring the normal operation of the exhaust gas treatment system 10.

[0040] The inclined design of the first connecting pipe 5 helps optimize the flow of exhaust gas, reduces local eddies and pressure loss, and allows the exhaust gas to enter the bag filter tower 2 more smoothly and evenly, improving dust removal efficiency and system stability. The angle between the first connecting pipe 5 and the side wall of the bag filter tower 2 is angle A, which is an acute angle. Specifically, the size of angle A can be set according to actual needs, for example, it can be 20 degrees, 30 degrees, 45 degrees, etc.

[0041] In some embodiments, refer to Figure 3 At least a portion of the exhaust gas inlet pipe 4 is an adjustable telescopic pipe 41. The telescopic pipe 41 can flexibly expand and contract according to the needs of fine-tuning the equipment installation position or the displacement caused by thermal expansion and contraction due to temperature changes, ensuring that the connection between the exhaust gas inlet pipe 4 and the sintering kiln 8 or the exhaust gas inlet pipe 4 and the air inlet 11 of the furnace pressure control fan 1 remains tight and straight. This avoids loosening and stress concentration at the connection between the exhaust gas inlet pipe 8 and the sintering kiln 8 due to the fixed pipe length, or exhaust gas leakage due to loosening at the connection between the exhaust gas inlet pipe 4 and the furnace pressure control fan 1. At the same time, it improves the adaptability and ease of installation of the exhaust gas inlet pipe 4 under different operating conditions.

[0042] In other embodiments, the exhaust gas temperature from the sintering kiln 8 is extremely high. In this case, the telescopic section of the exhaust gas inlet pipe 4 can effectively utilize its adjustable length and flexible structure to extend the flow path and residence time of the exhaust gas within the pipe. As the exhaust gas flows through the telescopic pipe 41, the large amount of heat it carries is first rapidly conducted through the inner wall of the exhaust gas inlet pipe 4 to the pipe wall material. Then, the heat is transferred from the pipe wall to the gap between the telescopic pipe 41 and the external environment through convection and radiation. This telescopic section is often designed to be partially exposed to the air, with the flowing air constantly sweeping across the outer wall, carrying away the heat accumulated on the pipe wall, thus achieving efficient heat dissipation. Simultaneously, the extendable nature of the telescopic pipe 41 allows its length to be dynamically adjusted according to the actual exhaust gas temperature and emission conditions, further controlling the residence time and heat transfer path of the exhaust gas in the heat dissipation section and enhancing heat exchange efficiency. After sufficient heat exchange through this telescopic section, the exhaust gas temperature is significantly reduced, alleviating the high-temperature load on subsequent treatment equipment.

[0043] In some embodiments, such as Figure 3As shown, the telescopic pipe 41 is a flexible metal hose. The exhaust gas discharged from the sintering kiln 8 is a high-temperature gas, which also contains other water vapor or corrosive gases. The flexible metal hose has good flexibility, high-temperature resistance, fatigue resistance, and sealing performance, and can be used stably for a long time in high-temperature, dusty, and somewhat corrosive exhaust gas transportation environments. In addition, if the furnace pressure control fan 1 or other equipment such as the sintering kiln 8 is displaced during operation, the exhaust gas inlet pipe 4 can also compensate for the displacement, preventing the connection between the furnace pressure control fan 1 or the sintering kiln 8 and the exhaust gas inlet pipe 4 from loosening, thus preventing exhaust gas leakage and improving the operational stability of the exhaust gas treatment system 10.

[0044] Optionally, the metal hose of the exhaust inlet pipe 4 can be made of stainless steel, Monel alloy, Hastelloy, etc.

[0045] In some embodiments, refer to Figure 1 The exhaust gas treatment system 10 also includes a second pressure detection element 9, the detection end of which is connected to the second connecting pipe 6. Specifically, as shown... Figure 1 As shown, the spray tower 3 has a waste gas inlet 35 connected to the second connecting pipe 6, and the detection end of the second pressure detection element 9 is located upstream of the waste gas inlet 35.

[0046] When the exhaust gas filtered by the bag filter tower 2 flows into the spray tower 3 through the second connecting pipe 6, the second pressure detection element 9 connected to the second connecting pipe 6 monitors the pressure changes within the second connecting pipe 6 in real time. Because a small amount of dust remains in the exhaust gas after preliminary filtration by the bag filter tower 2, during the airflow process, increased local resistance in the pipeline (such as gradual dust deposition, poor airflow at pipe bends or reductions in diameter) causes dust to accumulate in the pipeline, resulting in increased gas flow resistance within the second connecting pipe 6, and consequently, abnormal fluctuations in the pressure value of that pipe section. At this time, the second pressure detection element 9 can immediately capture this pressure change and feed the monitoring data back to the control system in real time. Upon receiving the abnormal signal, the control system can trigger an alarm or alert mechanism to notify maintenance personnel to promptly check for pipeline blockages and perform cleaning or maintenance, thereby ensuring the smooth flow of exhaust gas and the stability of subsequent spray treatment.

[0047] In some embodiments, refer to Figure 3The exhaust gas inlet pipe 4 is inclined upwards in the direction of the furnace pressure control fan 1. That is, the pipe section gradually rises from the outlet end of the sintering kiln 8 to the inlet end 11 of the furnace pressure control fan 1 along the airflow direction. During the flow of the high-temperature exhaust gas from the sintering kiln 8, due to gravity, the dust or tar in the exhaust gas will flow back and accumulate at the outlet end of the sintering kiln 8, avoiding the accumulation at the inlet end 11 of the furnace pressure control fan 1, which would cause blockage or corrosion. At the same time, the upward inclination angle can effectively reduce the kinetic energy of the exhaust gas directly impacting the impeller of the furnace pressure control fan 1, reduce the mechanical impact load of the high-speed airflow on the fan, and further optimize the uniformity of airflow distribution in conjunction with the natural climbing process of the airflow in the exhaust gas inlet pipe 4, improve the precise control capability of the furnace pressure control fan 1 on the system pressure, and take into account both the safety of equipment operation and the efficiency of exhaust gas delivery.

[0048] The inclination of the exhaust gas inlet pipe 4 and the furnace pressure control fan 1 can be adjusted according to the actual situation.

[0049] In some embodiments, refer to Figure 1 The spray tower 3 is equipped with spray heads 32, and a water collection tank 33 is located at the bottom of the spray tower 3. The spray tower 3 is one of the core purification devices of the exhaust gas treatment system 10. After the exhaust gas has been preliminarily purified by the bag filter tower 2, it arrives at the spray tower 3 through the second connecting pipe 6. The water curtain sprayed by the spray heads 32 on the spray tower 3 further treats the exhaust gas from the bag filter tower 2. The residual dust and soluble gases in the exhaust gas dissolve in the spray water and flow into the water collection tank 33 at the bottom of the spray tower 3.

[0050] In addition, the exhaust gas treatment system 10 also includes a circulation pump 20, one end of which is connected to a water collection tank 33, and the other end is connected to a spray head 32. When the circulation pump 20 is working, it pressurizes and delivers the clean spray water that has been settled in the water collection tank 33 to the spray head 32, so that the spray water is evenly sprayed into the spray tower 3 to fully contact the exhaust gas. After capturing and collecting dust and soluble gases, the wastewater falls back into the water collection tank 33 to form a circulation loop. In this process, the spray water is recycled and reused, which significantly reduces the consumption of fresh water during system operation, reduces water waste, saves on water replenishment and wastewater treatment costs, and maintains a stable purification efficiency in the spray tower 3.

[0051] Furthermore, the water collection tank 33 also has a sewage outlet 331, and the exhaust gas treatment system 10 also includes a sewage pump 40, the inlet end 42 of which is connected to the sewage outlet 331.

[0052] The spray head 32 on the spray tower 3 is connected to the water collection tank 33 at the bottom of the spray tower 3 through the circulation pump 20. The circulation pump 20 pumps the water in the water collection tank 33 to the spray head 32 for secondary dust removal and absorption of harmful gases in the exhaust gas. After spraying, the wastewater falls back to the water collection tank 33 for recycling. At the same time, the sewage pump 40 connected to the sewage outlet 331 of the water collection tank 33 regularly discharges the deposited impurities. The water inlet 34 set on the spray tower 3 replenishes the lost water volume, ensuring stable operation of the system and reducing water consumption.

[0053] Optionally, the circulating pump 20 can be: a centrifugal circulating pump, a self-priming circulating pump, a pump made of corrosion-resistant / wear-resistant material, or a multi-stage centrifugal pump.

[0054] In some embodiments, refer to Figure 1 There are at least two spray heads 32 arranged at intervals along the height direction. The waste gas inlet 35 of the spray tower 3 is located below the spray heads 32, and the clean gas outlet 31 is located at the top of the spray tower 3.

[0055] Spray heads 32 are arranged at intervals along the height of the spray tower 3. The number of spray heads 32 can be two or more, depending on the exhaust gas volume, dust and pollutant concentration. The exhaust gas, which has been preliminarily purified by the bag filter tower 2, flows vertically upward through the second connecting pipe 6. The clean gas outlet 31 is located at the top of the spray tower 3. The exhaust gas and each spray head 32 form an airflow path of "air inlet at the bottom and water outlet at the top". This allows the exhaust gas to mainly come into countercurrent contact with the rising exhaust gas through the spray water from the top spray head 32, increasing the cleaning contact surface of the exhaust gas and thus performing deep purification treatment on the exhaust gas. This ensures that the gas discharged from the top clean gas outlet 31 meets the environmental emission standards.

[0056] Specifically, such as Figure 1 As shown, the water inlet 34 is located below the waste gas inlet 35 and above the water collection tank 33. The incoming water can flow smoothly into the water collection tank 33, avoiding obstruction of airflow.

[0057] Furthermore, referring to Figure 1 The exhaust gas treatment system 10 also includes an exhaust fan 30, which is connected to the clean gas outlet 31 to ensure smooth exhaust of clean gas.

[0058] In some embodiments, refer to Figure 1 The exhaust gas treatment system 10 also includes a bypass pipe 50, which is connected to the exhaust gas inlet pipe 4.

[0059] The bypass pipe 50 can be activated without shutting down the furnace, providing a safe working environment for maintenance personnel. When a fault occurs in a certain part of the system during operation, maintenance personnel can enter the bag filter tower 2 or other components of the system through the bypass pipe 50 for inspection and maintenance, ensuring the continuity of the exhaust gas treatment system 10 and the production system and the convenience of equipment maintenance.

[0060] Furthermore, the exhaust gas treatment system 10 also includes a bypass control valve 60, which is located on the bypass pipe 50. Under normal operating conditions, the bypass control valve 60 remains closed, ensuring that all exhaust gas from the sintering kiln 8 is purified by the bag filter tower 2 and the spray tower 3. When equipment maintenance or handling of sudden malfunctions is required, maintenance personnel can operate the bypass control valve 60 to open it, directing the exhaust gas into the bypass pipe 50. This reduces the internal pressure and weakens the airflow of the exhaust gas treatment system 10, providing a safe environment for personnel to enter. At the same time, the valve opening is adjusted to maintain the overall pressure balance of the system, achieving a dual guarantee of operational flexibility and process stability.

[0061] Optionally, the main equipment and piping of the exhaust gas treatment system 10 can be made of stainless steel, such as 304 stainless steel. This can prevent magnetic contaminants from entering the materials.

[0062] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An exhaust gas treatment system, characterized in that, include: Furnace pressure control blower; A bag filter dust collector, wherein the bottom of the bag filter dust collector is provided with a slag discharge port; A spray tower, wherein the spray tower is provided with a clean air outlet; The exhaust gas inlet pipe is connected to the air inlet of the furnace pressure control blower; The first connecting pipe has one end connected to the air outlet of the furnace pressure control blower and the other end connected to the bag filter tower. The second connecting pipe has one end connected to the bag filter tower and the other end connected to the spray tower. The first pressure detection element, the detection end of the first pressure detection element is connected to the exhaust gas inlet pipe or is adapted to be connected to the sintering kiln. The furnace pressure control fan is a frequency-adjustable fan and is electrically connected to the first pressure detection element to adjust the frequency according to the detection result.

2. The exhaust gas treatment system according to claim 1, characterized in that, The first connecting pipe is inclined downward in the direction toward the bag filter tower.

3. The exhaust gas treatment system according to claim 1, characterized in that, At least a portion of the exhaust gas inlet pipe is a telescopic pipe with adjustable length.

4. The exhaust gas treatment system according to claim 3, characterized in that, The telescopic tube is a flexible metal tube.

5. The exhaust gas treatment system according to claim 1, characterized in that, Also includes: The second pressure detection element has its detection end connected to the second connecting pipe.

6. The exhaust gas treatment system according to claim 1, characterized in that, The exhaust gas inlet pipe is inclined upwards in the direction toward the furnace pressure control fan.

7. The exhaust gas treatment system according to any one of claims 1-6, characterized in that, The spray tower is equipped with spray heads, and a water collection tank is located at the bottom of the spray tower; The exhaust gas treatment system further includes a circulation pump, one end of which is connected to the water collection tank and the other end of which is connected to the spray head.

8. The exhaust gas treatment system according to claim 7, characterized in that, The water collection tank also has a sewage outlet, and the exhaust gas treatment system further includes a sewage pump, the inlet of which is connected to the sewage outlet. The spray tower is equipped with a water inlet.

9. The exhaust gas treatment system according to claim 8, characterized in that, The spray heads are at least two and are arranged at intervals along the height direction; The spray tower has a waste gas inlet connected to the second connecting pipe, and the waste gas inlet is located below the spray head; The water inlet is located below the waste gas inlet and above the water collection tank; The clean air outlet is located at the top of the spray tower.

10. The exhaust gas treatment system according to any one of claims 1-6, characterized in that, Also includes: A bypass pipe, wherein the bypass pipe is connected to the exhaust gas inlet pipe; A bypass control valve is provided on the bypass pipe.

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