High-efficiency flue gas purification device for carbon product baking furnace

Abstract

This invention discloses a high-efficiency purification device for flue gas from a carbon product roasting furnace, belonging to the field of environmental protection technology. It aims to solve the problems of existing roasting flue gas purification devices, such as weak capture ability of fine asphalt fumes, poor synergistic removal of multiple pollutants, and easy escape of pollutants. The device includes a collection cylinder, a mounting frame, a water tower, a support plate, and a heat exchange mechanism, a dual filtration mechanism, and a spraying mechanism connected in sequence. The heat exchange mechanism is fitted onto the outer surface of the water tower, the dual filtration mechanism is fixed inside the mounting frame, and the spraying mechanism is installed inside the support plate and the water tower. Through the synergistic effect of heat exchange, staged filtration, and spiral spraying, this invention can achieve rapid cooling of high-temperature flue gas, staged filtration of pollutants of different particle sizes, and efficient absorption of harmful components. The device has a compact integrated structure, reducing equipment footprint and operating costs, and meeting the environmental emission requirements for carbon product roasting flue gas.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, specifically to a high-efficiency purification device for flue gas from a carbon product roasting furnace. Background Technology

[0002] Calcination is a crucial step in the production of carbon products. Raw products are heated and solidified in a calcination furnace using petroleum coke powder as a protective medium, under air-isolated conditions, at a specific heating rate. This process generates a large amount of flue gas. This flue gas has a complex composition and high pollutant concentration, making it one of the most significant pollution sources in the carbon industry. The flue gas contains not only a large amount of particulate dust but also harmful pollutants such as asphalt fumes, sulfur dioxide, nitrogen oxides, and fluorides. Asphalt fumes contain potent carcinogens such as polycyclic aromatic hydrocarbons and benzo[a]pyrene. The small particle size, high resistivity at high temperatures, and poor fluidity at low temperatures make it difficult to control, severely hindering the green development of the carbon industry and threatening the surrounding ecological environment and human health.

[0003] To address the need for treating carbon product roasting flue gas, relevant technical personnel have begun developing corresponding purification devices. Among them, patent CN213942654U (National Authorization Announcement No.) discloses a carbon product roasting flue gas purification device. This device includes a purification pipe and a flue gas pipe connected to the roasting furnace on one side of the purification pipe. An ammonia pipe is located on the side of the purification pipe away from the flue gas pipe, with the flue gas pipe and ammonia pipe forming an angle with the purification pipe. A delay cone is installed inside the purification pipe, with evenly distributed air perforations on the delay cone. The delay cone is positioned above the air inlets of the flue gas pipe and ammonia pipe. A settling tank is located at the bottom of the purification pipe, and an auxiliary overflow tank is located on one side of the settling tank. An overflow pipe is connected between the settling tank and the auxiliary overflow tank, and a water outlet pipe is installed in the auxiliary overflow tank. A spray nozzle is located above the delay cone. This device has a simple structure, is easy to manufacture, and is suitable for large-scale application, enabling preliminary purification of roasting flue gas.

[0004] However, the carbon product roasting flue gas purification device disclosed in the aforementioned patent still has significant limitations in practical applications, making it difficult to meet the current requirements for the synergistic purification of multiple pollutants in carbon roasting flue gas and stringent environmental emission standards. This device uses only a single spray-sedimentation structure, resulting in a short residence time of the flue gas within the purification pipe. The mixing and contact between the flue gas and the spray liquid and purification medium are insufficient, limiting its ability to capture fine-particle asphalt fumes and hindering efficient removal. Furthermore, its purification effect on nitrogen oxides is poor, failing to simultaneously meet the requirements for the removal of multiple pollutants such as particulate matter, sulfur dioxide, nitrogen oxides, and fluorides. In addition, the device lacks a staged filtration structure, allowing dust and sticky asphalt fumes in the flue gas to easily adhere directly to the spray nozzles and the surface of the delay cone, causing nozzle blockage, decreased equipment stability, and the single purification process prone to pollutant escape. Overall, the purification efficiency is insufficient, making it difficult to meet the requirements for near-zero emissions of carbon roasting flue gas and current special environmental emission limits.

[0005] Existing purification devices for carbon roasting flue gas mostly adopt similar single purification structures. Although they can achieve preliminary purification of flue gas, they cannot effectively solve the above problems and are difficult to adapt to the increasingly stringent environmental protection requirements of the carbon industry. Summary of the Invention

[0006] The purpose of this invention is to provide a high-efficiency purification device for carbon product roasting furnace flue gas, in order to solve the problems mentioned in the background art regarding the weak capture ability of fine asphalt fumes, poor purification effect of nitrogen oxides, inability to achieve synergistic and efficient removal of multiple pollutants, insufficient mixing of flue gas and purification medium, easy escape of pollutants, resulting in insufficient overall purification efficiency and difficulty in meeting the requirements of near-zero emission of carbon roasting flue gas and current environmental protection special emission limits.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency purification device for flue gas from a carbon product roasting furnace includes a liquid collection cylinder and an installation frame. A water tower is connected to the upper surface of the liquid collection cylinder, and a support plate is fixedly installed on the upper part of the outer surface of the liquid collection cylinder. A spraying mechanism is fixedly installed on the upper surface of the support plate and the interior of the water tower. A first pipe is connected to the air inlet port of the spraying mechanism, and the other end of the first pipe is connected to the air outlet port of a dual filtration mechanism, which is fixedly installed inside the installation frame. A second pipe is connected to the air inlet port of the dual filtration mechanism, and the other end of the second pipe is connected to the air outlet port of a heat exchange mechanism. The heat exchange mechanism is fitted onto the upper part of the outer surface of the water tower, and the air inlet port of the heat exchange mechanism is connected to the flue gas exhaust port of the carbon product roasting furnace.

[0008] The aforementioned high-efficiency purification device for flue gas from a carbon product roasting furnace includes: a heat exchange mechanism comprising an outer ring and an inner ring; the upper and lower surfaces of the outer ring and the inner ring are fixedly connected by a first ring cover; the inner ring is fixedly installed at the upper end of the outer surface of the water tower; three sets of second ring covers are fixedly installed equidistantly along the axial direction between the outer ring and the inner ring; the three sets of second ring covers have flow gaps at their left, right, and left ends respectively, to allow the incoming flue gas to form a reciprocating serpentine flow path to extend the heat exchange path; one end of the outer surface of the outer ring is connected to two sets of gas pipes, one set of gas pipes being located at the uppermost end of the three sets of second ring covers, and the other set of gas pipes being located at the lowermost end of the three sets of second ring covers.

[0009] The aforementioned high-efficiency purification device for flue gas from carbon product roasting furnace includes: multiple sets of heat exchange tubes installed through the three sets of second ring covers, the heat exchange tubes being located inside the cavity between the outer ring and the inner ring; the upper and lower ends of each set of heat exchange tubes respectively extend to the outside of the two sets of first ring covers and are connected to the water ring tank cover; the two sets of water ring tank covers are respectively fixedly installed on the upper and lower surfaces of the two sets of first ring covers, and water pipes are connected to both sets of water ring tank covers.

[0010] The aforementioned high-efficiency purification device for flue gas from a carbon product roasting furnace includes: a dual filtration mechanism comprising a cyclone filter, which is fixedly installed at one end within an installation frame; a fan housing is connected to the upper surface of the cyclone filter, and a motor is fixedly installed on the upper surface of the fan housing; the output shaft of the motor rotatably penetrates into the interior of the fan housing, and an impeller is fixedly installed at the end of the output shaft, the impeller being rotatably installed inside the fan housing; a second pipe is connected to the air inlet port on the outer surface of the cyclone filter, and the other end of the second pipe is connected to the air pipe located at the uppermost end of the three sets of second ring covers.

[0011] The above-mentioned high-efficiency purification device for flue gas from carbon product roasting furnace includes: a third pipe connected to the air outlet port on the outer surface of the fan casing; the other end of the third pipe connected to the outer surface of the filter cartridge; the filter cartridge fixedly installed at the other end within the mounting frame; a cover rotatably mounted on the upper surface of the filter cartridge; a skeleton cylinder fixedly mounted on the lower surface of the cover; and a filter bag covering the outer surface of the skeleton cylinder.

[0012] The above-mentioned high-efficiency purification device for flue gas from carbon product roasting furnace includes: the lower surfaces of the cyclone filter and the filter cartridge are both connected and installed on the upper surface of the support plate, and the support plate is fixedly installed inside the mounting frame; collection boxes are slidably installed at both ends of the lower surface of the support plate, and the two collection boxes are perpendicularly opposite to the discharge ports at the lower ends of the cyclone filter and the filter cartridge; an electric butterfly valve is connected and installed inside the discharge pipe of the filter cartridge.

[0013] The aforementioned high-efficiency purification device for flue gas from a carbon product roasting furnace includes: a spraying mechanism comprising a riser fixedly installed inside a liquid collecting cylinder and extending to the inner top of a water tower; a spiral slide pipe fixedly installed on the outer surface of the riser, with an exhaust pipe and an inlet pipe respectively connected to the upper and lower ends of the spiral slide pipe, both of which are sealed through the outer surface of the water tower to the outside; one end of the inlet pipe is connected to a first pipe, and the other end of the first pipe is connected to the upper surface of a closed cover, wherein the first pipe is a stretchable corrugated pipe.

[0014] The aforementioned high-efficiency purification device for flue gas from carbon product roasting furnace includes a drain hole on the inner lower surface of the spiral slide tube.

[0015] The above-mentioned high-efficiency purification device for flue gas from carbon product roasting furnace includes: a spiral tube connected to the outer surface of the riser, and multiple sets of atomizing nozzles connected at equal intervals along the spiral direction on the outer surface of the spiral tube; a spiral strip opening is provided on the inner ring surface of the spiral slide tube, and the spiral tube passes through the spiral strip opening so that the atomizing nozzles are located inside the spiral slide tube.

[0016] The aforementioned high-efficiency purification device for flue gas from a carbon product roasting furnace comprises: one end of the outer surface of the riser is connected to a drain pipe, and the other end of the drain pipe passes through the inside of the collection cylinder in a sealed manner to the outside, and is connected to the drain port of a water pump; the water pump is fixedly installed on the upper surface of the support plate, and a suction pipe is connected to the suction port of the water pump, the other end of which passes through the inside of the collection cylinder in a sealed manner; a ball valve is connected to one end of the outer surface of the collection cylinder, and the ball valve is used for the injection and discharge of the spray liquid.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The heat exchange mechanism adopts an integrated structure mounted on the outer surface of the water tower. Combined with the water circulation design of the serpentine flow channel and multiple sets of heat exchange tubes, it significantly extends the heat exchange path and residence time of the flue gas, improves the contact efficiency between the flue gas and the cooling medium, realizes rapid and uniform cooling of high-temperature flue gas, avoids thermal damage to subsequent filter components and spray components caused by high-temperature flue gas, and provides stable and suitable temperature conditions for subsequent purification stages. At the same time, the integrated layout reduces the overall installation space of the equipment.

[0018] 2. The dual filtration mechanism adopts a staged filtration structure with a cyclone filter and a filter cartridge connected in series. It can remove pollutants of different particle sizes step by step. First, large-particle dust and asphalt fumes are separated by centrifugation. Then, fine pollutants are intercepted by the filter bag, which improves the thoroughness of flue gas filtration, greatly reduces the amount of pollutants entering the subsequent spraying process, reduces the pollution rate of the spray liquid, and extends the service life of the spray liquid.

[0019] 3. The spraying mechanism adopts a structure that combines a spiral slide tube with spirally arranged atomizing nozzles, which can guide the flue gas to flow along the spiral path, greatly extending the residence time of the flue gas in the spraying area. At the same time, the atomized spray liquid can form sufficient reverse contact with the flue gas, enhance the gas-liquid mass transfer efficiency, efficiently absorb the residual harmful pollutants in the flue gas, prevent pollutant escape, achieve the synergistic removal of multiple pollutants, and ensure that the purified flue gas meets environmental emission requirements.

[0020] 4. The device integrates heat exchange, staged filtration, deep spraying, waste liquid collection, and waste residue collection into one unit, forming a closed and complete flue gas purification path to avoid environmental pollution caused by flue gas leakage. At the same time, the integrated structural layout greatly reduces the equipment's footprint and adapts to the installation needs of different sites, especially suitable for application scenarios of small and medium-sized carbon enterprises.

[0021] 5. The liquid collection tank, together with the water pump, suction pipe, and discharge pipe, forms a spray liquid circulation path, which can realize the recycling of spray liquid, reduce water consumption, and reduce equipment operating costs; the sliding collection box, the rotatable and openable cover, and the stretchable first pipe greatly reduce the difficulty of daily cleaning and component replacement, and reduce the manpower and time costs of operation and maintenance.

[0022] 6. The purification process of the entire device is seamlessly connected, and the various functional components work together to achieve targeted treatment based on the compositional characteristics of carbon roasting flue gas. This solves the problems of insufficient capture capacity of fine asphalt fumes, poor synergistic removal effect of multiple pollutants, and easy escape of pollutants in existing purification devices, achieving efficient and stable purification of flue gas and meeting the long-term treatment needs of carbon product roasting flue gas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first pipe, the second pipe, and the third pipe of the present invention; Figure 3 This is a schematic diagram of the overall side cross-section of the present invention; Figure 4 This is a schematic diagram of the liquid collecting cylinder and ball valve of the present invention; Figure 5 This is a schematic diagram of the heat exchange mechanism of the present invention; Figure 6 This is a schematic diagram of the dual filtration mechanism of the present invention; Figure 7 This is a schematic diagram of the water pump and riser of the present invention; Figure 8 This is a schematic diagram of the spiral slide tube and spiral tube of the present invention.

[0024] In the diagram: 1. Support plate; 101. Liquid collecting cylinder; 102. Ball valve; 103. Mounting frame; 104. First pipe; 105. Third pipe; 106. Second pipe; 107. Collection box; 108. Water tower; 2. Spraying mechanism; 201. Water pump; 202. Drain pipe; 203. Suction pipe; 204. Spiral slide pipe; 205. Exhaust pipe; 206. Smoke inlet pipe; 207. Riser; 208. Spiral tube; 209. Atomizing nozzle; 210. Spiral strip 3. Heat exchange mechanism; 301. First ring cover; 302. Water ring tank cover; 303. Second ring cover; 304. Heat exchange tube; 305. Water pipe; 306. Outer ring; 307. Inner ring; 308. Air pipe; 4. Dual filtration mechanism; 401. Cyclone filter; 402. Fan casing; 403. Motor; 404. Impeller; 405. Filter cartridge; 406. Closed cover; 407. Frame cylinder; 408. Filter bag; 409. Electric butterfly valve; 410. Support plate. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-8 This embodiment provides a high-efficiency purification device for flue gas from a carbon product roasting furnace, including a liquid collection cylinder 101 and an installation frame 103. A water tower 108 is connected to the upper surface of the liquid collection cylinder 101. A support plate 1 is fixedly installed on the upper end of the outer surface of the liquid collection cylinder 101. A spraying mechanism 2 is fixedly installed on the upper surface of the support plate 1 and the interior of the water tower 108. A first pipe 104 is connected to the air inlet port of the spraying mechanism 2. The other end of the first pipe 104 is connected to the air outlet port of a dual filtration mechanism 4. The dual filtration mechanism 4 is fixedly installed inside the installation frame 103. A second pipe 106 is connected to the air inlet port of the dual filtration mechanism 4. The other end of the second pipe 106 is connected to the air outlet port of a heat exchange mechanism 3. The heat exchange mechanism 3 is fitted onto the upper end of the outer surface of the water tower 108. The air inlet port of the heat exchange mechanism 3 is used to connect with the flue gas exhaust end of the carbon product roasting furnace.

[0027] The above technical solution defines the overall composition and connection relationship of the purification device. The heat exchange mechanism 3 is installed on the upper end of the outer surface of the water tower 108, realizing the integrated layout of heat exchange and spray functions, and reducing the overall footprint of the equipment. The flue gas flows in sequence according to the heat exchange mechanism 3, the dual filtration mechanism 4, and the spray mechanism 2, forming a complete treatment process of cooling, filtration, and deep purification, realizing the synergistic removal of multiple types of pollutants in the flue gas, and ensuring that the flue gas purification effect meets the environmental emission requirements. Each functional component is connected in an orderly manner through corresponding pipelines to form a closed flue gas treatment path, avoiding the escape of pollutants caused by flue gas leakage. At the same time, the centralized structural layout reduces the difficulty of equipment installation and daily operation and maintenance.

[0028] Specifically, in this embodiment: the heat exchange mechanism 3 includes an outer ring 306 and an inner ring 307. The upper and lower surfaces of the outer ring 306 and the inner ring 307 are fixedly connected by a first ring cover 301. The inner ring 307 is fixedly installed at the upper end of the outer surface of the water tower 108. Three sets of second ring covers 303 are fixedly installed equidistantly along the axial direction between the outer ring 306 and the inner ring 307. The three sets of second ring covers 303 have flow gaps at the left, right, and left ends in sequence to allow the flue gas to form a reciprocating serpentine flow channel to extend the heat exchange path. Two sets of air pipes 308 are connected to one end of the outer surface of the outer ring 306. One set of air pipes 308 is located at the uppermost end of the three sets of second ring covers 303, and the other set of air pipes 308 is located at the lowermost end of the three sets of second ring covers 303.

[0029] This design defines the cavity structure and flow channel design of the heat exchange mechanism 3. The outer ring 306 and the inner ring 307, together with the first ring cover 301, form a closed annular heat exchange cavity, avoiding the problem of short-circuiting of flue gas. The three sets of second ring covers 303, through staggered flow gaps, force the flue gas to form a reciprocating serpentine flow channel in the annular cavity, significantly extending the flow path and residence time of the flue gas in the heat exchange mechanism 3, improving the contact efficiency between the flue gas and the heat exchange structure, and enhancing the heat exchange and cooling effect. The two sets of gas pipes 308 are respectively set at the beginning and end of the serpentine flow channel, ensuring that the flue gas can flow completely through the entire heat exchange channel, eliminating heat exchange blind spots, and ensuring the uniformity and stability of flue gas cooling.

[0030] Specifically, in this embodiment: multiple sets of heat exchange tubes 304 are installed through the three sets of second ring covers 303, and the heat exchange tubes 304 are located inside the cavity between the outer ring 306 and the inner ring 307; the upper and lower ends of each set of heat exchange tubes 304 respectively extend to the outside of the two sets of first ring covers 301, and are connected to the water ring tank cover 302; the two sets of water ring tank covers 302 are respectively fixedly installed on the upper and lower surfaces of the two sets of first ring covers 301, and water pipes 305 are connected to both sets of water ring tank covers 302.

[0031] This scheme defines the heat exchange medium circulation structure of the heat exchange mechanism 3. Multiple sets of heat exchange tubes 304 are installed inside the second ring cover 303, which can fully contact the flue gas in the serpentine flow channel. Heat exchange is completed between the tubes and the high-temperature flue gas through the cooling medium inside the tubes, achieving rapid cooling of the flue gas. The water ring cover 302 can evenly distribute the cooling medium to each set of heat exchange tubes 304, ensuring uniform flow of the cooling medium in each heat exchange tube 304 and avoiding the problem of insufficient local heat exchange effect. The water pipe 305 realizes the continuous input and output of the cooling medium, maintains the temperature stability of the cooling medium during the heat exchange process, ensures continuous and efficient heat exchange capacity, and at the same time, the cooled flue gas can avoid thermal damage to the subsequent filtration and spray components caused by high temperature, ensuring the stable operation of the subsequent purification stage.

[0032] Specifically, in this embodiment: the dual filtration mechanism 4 includes a cyclone filter 401, which is fixedly installed at one end within the mounting frame 103; a fan housing 402 is connected to the upper surface of the cyclone filter 401, and a motor 403 is fixedly installed on the upper surface of the fan housing 402. The output shaft of the motor 403 rotates through the inside of the fan housing 402, and an impeller 404 is fixedly installed at the end of the output shaft. The impeller 404 is rotatably installed inside the fan housing 402; a second pipe 106 is connected to the air inlet port on the outer surface of the cyclone filter 401, and the other end of the second pipe 106 is connected to the air pipe 308 located at the uppermost end of the three sets of second ring covers 303.

[0033] This scheme defines the power and primary filtration structure of the dual filtration mechanism 4. The motor 403 drives the impeller 404 to rotate inside the fan casing 402, which can provide stable negative pressure power for the entire flow of flue gas, ensuring that the flue gas can flow through each purification stage in an orderly manner according to the preset path, avoiding the problem of poor flue gas flow. The cyclone filter 401 can use centrifugal force to perform primary treatment on the cooled flue gas, separating coarse dust particles and large-diameter asphalt fume pollutants in the flue gas, realizing primary purification of the flue gas, while reducing the processing load of subsequent filtration stages and extending the service life of subsequent filter components.

[0034] Specifically, in this embodiment: the air outlet port on the outer surface of the fan housing 402 is connected to and installed with a third pipe 105, the other end of the third pipe 105 is connected to and installed on the outer surface of the filter cartridge 405, and the filter cartridge 405 is fixedly installed in the other end of the mounting frame 103; a cover 406 is rotatably installed on the upper surface of the filter cartridge 405, a skeleton cylinder 407 is fixedly installed on the lower surface of the cover 406, and a filter bag 408 is covered on the outer surface of the skeleton cylinder 407.

[0035] This scheme defines a two-stage filtration structure for the dual filtration mechanism 4. The third pipe 105 can stably transport the flue gas treated by the cyclone filter 401 into the filter cartridge 405, realizing the orderly transfer of the flue gas after primary filtration. The skeleton cylinder 407 can provide stable support for the filter bag 408, preventing the filter bag 408 from deforming or breaking under the pressure of the flue gas, and ensuring the operational stability of the filtration structure. The filter bag 408 can perform secondary interception on the flue gas after primary filtration, removing residual fine dust and fine asphalt fumes in the flue gas. Together with the cyclone filter 401, it forms a graded filtration system, realizing the step-by-step removal of pollutants of different particle sizes, improving the thoroughness of flue gas filtration, and reducing the content of pollutants entering the subsequent spraying stage.

[0036] Specifically, in this embodiment: the lower surfaces of the cyclone filter 401 and the filter cartridge 405 are both connected and installed on the upper surface of the support plate 410, and the support plate 410 is fixedly installed inside the mounting frame 103; collection boxes 107 are slidably installed at both ends of the lower surface of the support plate 410, and the two collection boxes 107 are perpendicularly opposite to the discharge ports at the lower ends of the cyclone filter 401 and the filter cartridge 405, respectively; an electric butterfly valve 409 is connected and installed inside the discharge port of the filter cartridge 405.

[0037] This design defines the discharge and waste collection structure of the dual filtration mechanism 4. The support plate 410 provides stable installation support for the cyclone filter 401 and the filter cartridge 405, while ensuring that the discharge ports of the two filter components are precisely aligned with the collection box 107 below. The collection box 107 can collect the solid waste separated from the cyclone filter 401 and the filter cartridge 405, preventing pollutants from scattering and causing secondary pollution. The sliding installation method facilitates the removal and cleaning of the collection box 107, reducing the difficulty of equipment operation and maintenance. The electric butterfly valve 409 can control the opening and closing of the discharge port of the filter cartridge 405. It remains closed during the filtration operation to ensure the sealing performance inside the filter cartridge 405 and prevent flue gas leakage. It opens during the dust removal operation to ensure that the waste trapped inside the filter cartridge 405 can be smoothly discharged into the collection box 107.

[0038] Specifically, in this embodiment: the spraying mechanism 2 includes a riser 207, which is fixedly installed inside the liquid collection cylinder 101 and extends to the inner top of the water tower 108; a spiral slide pipe 204 is fixedly installed on the outer surface of the riser 207, and the upper and lower ends of the spiral slide pipe 204 are respectively connected to the exhaust pipe 205 and the inlet pipe 206, which are sealed through the outer surface of the water tower 108 to the outside; one end of the inlet pipe 206 is connected to the first pipe 104, and the other end of the first pipe 104 is connected to the upper surface of the cover 406, which is a stretchable corrugated pipe.

[0039] This scheme defines the main structure and flue gas passage of the spray mechanism 2. The riser 207 provides stable installation support for the spiral slide pipe 204, ensuring the stability of the spiral slide pipe 204 in the water tower 108. The spiral slide pipe 204 can guide the filtered flue gas to flow along the spiral path, greatly extending the residence time of the flue gas in the spray mechanism 2, providing sufficient time for the flue gas to fully contact the spray liquid. The first pipe 104 adopts a stretchable corrugated pipe structure, which can adapt to the positional changes during the opening and closing of the cover 406, ensuring that the flue gas passage between the filter cartridge 405 and the spray mechanism 2 remains connected at all times, while facilitating the opening operation of the cover 406 and reducing the difficulty of replacing the filter bag 408.

[0040] Specifically, in this embodiment, a drain hole is provided on the inner lower surface of the spiral slide tube 204. This design defines the drain structure of the spiral slide tube 204. The drain hole on the inner lower surface of the spiral slide tube 204 allows the spray waste liquid that has absorbed pollutants after the spraying operation to be smoothly discharged from the spiral slide tube 204, preventing the waste liquid from accumulating inside the spiral slide tube 204 and ensuring the smooth flow of flue gas. At the same time, the discharged waste liquid can flow back to the collection cylinder 101 for centralized collection, providing a basis for the recycling of spray liquid.

[0041] Specifically, in this embodiment: a spiral tube 208 is connected to the outer surface of the riser 207, and multiple sets of atomizing nozzles 209 are connected to the outer surface of the spiral tube 208 at equal intervals along the spiral direction; a spiral groove 210 is opened on the inner ring surface of the spiral slide tube 204, and the spiral tube 208 passes through the spiral groove 210, so that the atomizing nozzles 209 are located inside the spiral slide tube 204.

[0042] This scheme defines the spray liquid injection structure of the spray mechanism 2. The spiral tube 208 is arranged along the spiral direction and is adapted to the direction of the spiral slide tube 204, ensuring that the atomizing nozzles 209 can be evenly arranged along the flue gas flow path. The spiral bar opening 210 provides installation space for the spiral tube 208 and the atomizing nozzles 209, allowing the atomizing nozzles 209 to extend into the spiral slide tube 204, ensuring that the spray liquid can be directly sprayed into the flue gas flow area. Multiple sets of atomizing nozzles 209 can atomize the spray liquid and spray it evenly, forming full contact with the flue gas flowing along the spiral path, enhancing the gas-liquid mass transfer effect, efficiently absorbing the residual harmful pollutants in the flue gas, achieving deep purification of the flue gas, and eliminating purification blind spots.

[0043] Specifically, in this embodiment: one end of the outer surface of the riser 207 is connected to the drain pipe 202, and the other end of the drain pipe 202 passes through the inside of the collection cylinder 101 and is connected to the drain port of the water pump 201; the water pump 201 is fixedly installed on the upper surface of the support plate 1, and a suction pipe 203 is connected to the suction port of the water pump 201, and the other end of the suction pipe 203 passes through the inside of the collection cylinder 101; a ball valve 102 is connected to one end of the outer surface of the collection cylinder 101, and the ball valve 102 is used for the filling and discharge of the spray liquid.

[0044] This scheme defines the spray liquid circulation and control structure of the spray mechanism 2. The water pump 201 draws the spray liquid from the collection cylinder 101 through the suction pipe 203 and delivers it to the riser 207 through the discharge pipe 202, providing a continuous and stable supply of spray liquid for the spraying operation and ensuring the continuous operation of the atomized spraying. The collection cylinder 101 can collect the spray waste liquid in a centralized manner, and together with the water pump 201, realize the recycling of the spray liquid, reduce water consumption, and reduce equipment operating costs. The ball valve 102 can conveniently control the opening and closing of the collection cylinder 101, which is convenient for adding new spray liquid and discharging the waste spray liquid according to the degree of pollution of the spray liquid, ensuring the stability of the spray purification effect.

[0045] Specifically, in this embodiment: the flue gas purification efficiency of the spray mechanism 2 satisfies the following gas-liquid mass transfer-structure coupling equation:

[0046] in: Flue gas purification efficiency, dimensionless; : Gas-liquid mass transfer coefficient, with units of m / s, determined by experimental measurement or empirical formula; : Effective length of the 204 spiral slide tube, in meters; Surface area of ​​liquid film per unit length, in meters. 2 / m, determined by the arrangement density of the spiral tube 208 and the atomizing nozzle 209; Flue gas volumetric flow rate, in m³ / s 3 / s; The helical structure enhancement factor is dimensionless and determined by the geometric parameters of the helical slide tube (such as helical diameter and pitch). ≥1 can be obtained through computational fluid dynamics simulation or experimental calibration; The influence coefficient of the thermophysical properties of the spray liquid is dimensionless and ranges from 0 to 0.5. It is related to the density of the atomizing nozzles and the properties of the spray liquid. Specific heat capacity of the spray liquid, in J / (kg·K); The standard specific heat capacity of water is taken as 4186 J / (kg·K).

[0047] Example: Assume the flue gas operating conditions and spray mechanism design parameters of a carbon roasting furnace are as follows: (Determined experimentally); (Effective length of spiral slide tube); =0.8m² / m (surface area of ​​liquid film per unit length). (Flue gas volumetric flow rate); (The helical structure enhancement factor is obtained by calculation of geometric parameters or CFD simulation). (Influence coefficient of thermophysical properties of spray fluid, medium density nozzle); (The specific heat capacity of the spray liquid is close to that of water);

[0048] calculate: ;

[0049] ; ; ; This translates to a purification efficiency of approximately 25.05%. This figure indicates that the spray system is inefficient under these conditions, requiring parameter optimization (e.g., increasing L, A, or improving...). To achieve higher efficiency, 95% efficiency is required, which necessitates an NTU ≈ 3. This can be achieved by adjusting the design (e.g., increasing L to 40m or improving...). Up to level 5).

[0050] Technical effect 1. Quantitative Design Tool: This equation incorporates the geometric parameters of the spiral slide tube ( ), flue gas flow characteristics (Q), spray liquid physical properties ( The unified inclusion of efficiency prediction models provides a theoretical basis for the design optimization of the device, and the required structural dimensions can be deduced from the target efficiency.

[0051] 2. Dynamic control basis: In actual operation, the current efficiency can be calculated by equations based on real-time monitored parameters such as flue gas flow rate and temperature, and the spray liquid flow rate, composition or atomization intensity can be adjusted to keep the efficiency at a high level.

[0052] 3. Energy saving and consumption reduction: Avoid blindly increasing the spray volume, and determine the minimum required spray intensity through precise calculation to reduce water pump energy consumption and spray liquid consumption.

[0053] 4. Near-zero emission guarantee: The equation can guide the design to make the NTU large enough (e.g., >4) to ensure that the purification efficiency approaches 100% and meets increasingly stringent environmental emission limits.

[0054] 5. High adaptability: Correction factors in the equation and It can be adjusted according to the characteristics of the flue gas from the roasting of different carbon products, and is suitable for various working conditions.

[0055] Working principle and process 1. Parameter Acquisition: Flue gas flow rate Q and temperature are measured under the operating conditions of the calcining furnace; the enhancement factor is calculated or obtained through CFD simulation based on the geometric parameters (diameter, pitch) of the spiral tube. Calculate the surface area A of the liquid film per unit length based on the nozzle arrangement; determine the mass transfer coefficient using empirical formulas or experiments. Determine the specific heat capacity of the spray liquid. .

[0056] 2. Efficiency Calculation: Substitute the above parameters into the equation to calculate the purification efficiency under the current design or operating conditions. .

[0057] 3. Design optimization: If If the target value is not reached, adjust L and A (e.g., increase the spiral tube length or nozzle density) and optimize the spray liquid properties (e.g., add surfactants to improve performance). Or improve the helical geometry to increase Recalculate until the requirements are met.

[0058] 4. Operation and Control: During unit operation, real-time monitoring of flue gas flow rate Q and temperature (affecting...) and ), calculated online via equations It automatically adjusts the spray pump frequency or atomization pressure to make... Stay within the set range.

[0059] 5. Feedback loop: Compare the purified flue gas emission concentration with the predicted values ​​from the equation to verify the model's accuracy and continuously adjust the parameters (e.g., ...). This leads to self-learning optimization control.

[0060] The overall working principle of this invention is as follows: The power for the operation of the device is provided by motor 403. Motor 403 drives impeller 404 to rotate inside fan casing 402, forming a continuous negative pressure and guiding the flue gas from the roasting furnace to flow orderly within the device along a preset path.

[0061] The high-temperature flue gas discharged from the roasting furnace first enters the heat exchange mechanism 3. The flue gas enters the annular cavity between the outer ring 306 and the inner ring 307 through the gas pipe 308 on the outer ring 306. The upper and lower ends of the outer ring 306 and the inner ring 307 are sealed and fixed by the first ring cover 301. Three sets of second ring covers 303 are installed equidistantly along the axial direction in the annular cavity. The flow gaps opened by the staggered three sets of second ring covers 303 force the flue gas to form a reciprocating serpentine flow channel in the annular cavity, prolonging the flow path and residence time of the flue gas. At the same time, the cooling medium enters the water ring box cover 302 through the water pipe 305. After being diverted by the water ring box cover 302, it enters the multiple sets of heat exchange tubes 304 evenly. The heat exchange tubes 304 are installed through the three sets of second ring covers 303, and fully contact the high-temperature flue gas in the serpentine flow channel to complete heat exchange, realizing rapid cooling of the flue gas. The cooled flue gas is discharged from the heat exchange mechanism 3 through another set of gas pipes 308 on the outer ring 306.

[0062] After cooling, the flue gas enters the dual filtration mechanism 4 through the second pipe 106. First, it enters the cyclone filter 401. Under the action of centrifugal force, coarse dust particles and large-diameter asphalt fumes in the flue gas are separated, completing the primary filtration of the flue gas. The flue gas after primary filtration enters the filter cartridge 405 through the third pipe 105 at the outlet port of the fan casing 402. The skeleton cylinder 407 inside the filter cartridge 405 provides stable support for the filter bag 408. When the flue gas passes through the filter bag 408, the fine dust particles and fine asphalt fumes in it are intercepted and filtered, completing the secondary purification of the flue gas.

[0063] After double filtration, the flue gas enters the spraying mechanism 2 through the first pipe 104, and then enters the spiral slide pipe 204 through the smoke inlet pipe 206. The spiral slide pipe 204 is fixedly installed on the outer surface of the riser 207. The flue gas flows along the spiral path of the spiral slide pipe 204, extending the residence time in the spraying area. At the same time, the water pump 201 draws spraying liquid from the collection cylinder 101 through the suction pipe 203, and delivers it to the riser 207 through the discharge pipe 202. It is then diverted to the spiral pipe 208 connected to the riser 207. Multiple sets of atomizing nozzles 209 on the spiral pipe 208 pass through the spiral strip openings 210 on the spiral slide pipe 204, atomize the spraying liquid and spray it evenly into the interior of the spiral slide pipe 204, making full contact with the flowing flue gas and absorbing harmful pollutants such as residual sulfur dioxide, nitrogen oxides, and fine asphalt fumes in the flue gas, thus completing the deep purification of the flue gas.

[0064] The purified flue gas is discharged from the device through the exhaust pipe 205 at the upper end of the spiral slide pipe 204. The spray waste liquid after absorbing pollutants flows back to the collection cylinder 101 through the drain hole on the lower inner surface of the spiral slide pipe 204 for centralized collection. The solid waste separated by the dual filtration mechanism 4 falls into the collection box 107 below the support plate 410 for centralized treatment. The ball valve 102 on the outer surface of the collection cylinder 101 can control the addition and discharge of the spray liquid, realizing the recycling of the spray liquid.

[0065] The method of using this invention is as follows: 1. Preparations before powering on Add appropriate spray liquid to the collection cylinder 101 through ball valve 102, and confirm that the spray liquid level meets the requirements for circulation. Connect the water pipe 305 of the heat exchange mechanism 3 to the external cooling medium circulation system, and confirm that the cooling medium circulation path is unobstructed. Check the connection status of the first pipe 104, the second pipe 106, and the third pipe 105 to ensure that each pipe connection is sealed and leak-free. Rotate the open cover 406 to check the installation status of the filter bag 408 on the skeleton cylinder 407. After confirming that there is no damage or looseness, reset the cover 406. Check the installation position of the collection box 107 below the support plate 410, and confirm that it is vertically aligned with the corresponding discharge port. At the same time, confirm that the electric butterfly valve 409 at the discharge port of the filter cylinder 405 is in the closed state.

[0066] 2. Start-up and operation First, start the external cooling medium circulation system to allow the cooling medium to flow continuously through the heat exchange tube 304 and establish a stable heat exchange cycle. Then, start the motor 403, which drives the impeller 404 to rotate and create negative pressure, guiding the flue gas discharged from the roasting furnace to continuously enter the device. After the flue gas flow is stable, start the water pump 201, which continuously delivers the spray liquid in the liquid collection cylinder 101 to the atomizing nozzle 209 to complete the atomizing spraying operation. The device then enters the continuous flue gas purification state.

[0067] 3. Routine maintenance operations Periodically remove the collection box 107, clean the solid waste collected inside, and reinstall it after cleaning; periodically open the electric butterfly valve 409 to clean the filter bag 408 in the filter cartridge 405, and close the electric butterfly valve 409 after cleaning; periodically check the pollution level of the spray liquid in the liquid collection cylinder 101 through the ball valve 102. When the purification capacity of the spray liquid decreases, discharge the failed spray liquid through the ball valve 102 and add new spray liquid; when the filter bag 408 is damaged or blocked, stretch the retractable first pipe 104, rotate the opening and closing cover 406, take out the skeleton cylinder 407 to replace the filter bag 408, and reset the closing cover 406 and the first pipe 104 after replacement.

[0068] 4. Shutdown Operation First, stop the flue gas input from the roasting furnace. After the residual flue gas in the device has completed the full process purification, turn off water pump 201 and stop the spraying operation. Then, turn off motor 403 and stop the flue gas delivery. Finally, turn off the external cooling medium circulation system to complete the shutdown operation. After shutdown, the device can be thoroughly cleaned and inspected to ensure the stable operation of subsequent operations.

[0069] All parts not described in this invention are the same as or can be implemented using existing technology. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon product calcination furnace flue gas high-efficiency purification device, comprising a liquid collecting cylinder (101) and a mounting frame (103), characterized in that: The upper surface of the liquid collection cylinder (101) is connected to a water tower (108), and a support plate (1) is fixedly installed on the upper end of the outer surface of the liquid collection cylinder (101). The upper surface of the support plate (1) and the interior of the water tower (108) are jointly fixedly installed with a spraying mechanism (2). The air inlet port of the spraying mechanism (2) is connected to a first pipe (104), and the other end of the first pipe (104) is connected to the air outlet port of the dual filtration mechanism (4). The dual filtration mechanism (4) is fixedly installed inside the mounting frame (103). The air inlet port of the dual filtration mechanism (4) is connected to a second pipe (106), and the other end of the second pipe (106) is connected to the air outlet port of the heat exchange mechanism (3). The heat exchange mechanism (3) is fitted onto the upper end of the outer surface of the water tower (108), and the air inlet port of the heat exchange mechanism (3) is used to connect with the flue gas exhaust end of the carbon product roasting furnace.

2. The carbon product baking furnace flue gas high efficiency purification device according to claim 1, characterized in that: The heat exchange mechanism (3) includes an outer ring (306) and an inner ring (307). The upper and lower surfaces of the outer ring (306) and the inner ring (307) are fixedly connected by a first ring cover (301). The inner ring (307) is fixedly installed at the upper end of the outer surface of the water tower (108). Three sets of second ring covers (303) are fixedly installed equidistantly along the axial direction between the outer ring (306) and the inner ring (307). The three sets of second ring covers (303) have flow gaps at the left, right and left ends in sequence to allow the flue gas to form a reciprocating serpentine flow channel to extend the heat exchange path. Two sets of air pipes (308) are connected to one end of the outer surface of the outer ring (306). One set of air pipes (308) is located at the uppermost end of the three sets of second ring covers (303), and the other set of air pipes (308) is located at the lowermost end of the three sets of second ring covers (303).

3. The carbon product baking furnace flue gas high-efficiency purification device according to claim 2, characterized in that: Multiple sets of heat exchange tubes (304) are installed through the three sets of second ring covers (303). The heat exchange tubes (304) are located inside the cavity between the outer ring (306) and the inner ring (307). The upper and lower ends of each set of heat exchange tubes (304) are respectively connected to the outside of the two sets of first ring covers (301) and are connected to the water ring tank cover (302). The two sets of water ring tank covers (302) are respectively fixedly installed on the upper and lower surfaces of the two sets of first ring covers (301), and water pipes (305) are connected to both sets of water ring tank covers (302).

4. The carbon product baking furnace flue gas high efficiency purification device according to claim 1, characterized in that: The dual filtration mechanism (4) includes a cyclone filter (401), which is fixedly installed at one end within the mounting frame (103); a fan housing (402) is connected to the upper surface of the cyclone filter (401), and a motor (403) is fixedly installed on the upper surface of the fan housing (402). The output shaft of the motor (403) rotates through the inside of the fan housing (402), and an impeller (404) is fixedly installed at the end of the output shaft. The impeller (404) is rotatably installed inside the fan housing (402); a second pipe (106) is connected to the air inlet port on the outer surface of the cyclone filter (401), and the other end of the second pipe (106) is connected to the air pipe (308) located at the uppermost end of the three sets of second ring covers (303).

5. The carbon product baking furnace flue gas high efficiency purification device according to claim 4, characterized in that: The air outlet port on the outer surface of the fan casing (402) is connected to a third pipe (105). The other end of the third pipe (105) is connected to the outer surface of the filter cartridge (405). The filter cartridge (405) is fixedly installed in the other end of the mounting frame (103). A cover (406) is rotatably installed on the upper surface of the filter cartridge (405). A skeleton cylinder (407) is fixedly installed on the lower surface of the cover (406). A filter bag (408) is covered on the outer surface of the skeleton cylinder (407).

6. The high-efficiency purification device for carbon product roasting furnace flue gas according to claim 4, characterized in that: The lower surfaces of the cyclone filter (401) and the filter cartridge (405) are both connected to the upper surface of the support plate (410), and the support plate (410) is fixedly installed inside the mounting frame (103); a collection box (107) is slidably installed at both ends of the lower surface of the support plate (410), and the two collection boxes (107) are perpendicular to the discharge ports at the lower ends of the cyclone filter (401) and the filter cartridge (405), respectively; an electric butterfly valve (409) is connected to the discharge port of the filter cartridge (405).

7. The high-efficiency purification device for flue gas from carbon product roasting furnace according to claim 1, characterized in that: The spraying mechanism (2) includes a riser (207), which is fixedly installed inside the liquid collection cylinder (101) and extends to the inner top of the water tower (108); a spiral slide pipe (204) is fixedly installed on the outer surface of the riser (207), and the upper and lower ends of the spiral slide pipe (204) are respectively connected to the exhaust pipe (205) and the inlet pipe (206). The exhaust pipe (205) and the inlet pipe (206) are both sealed through the outer surface of the water tower (108) to the outside; one end of the inlet pipe (206) is connected to the first pipe (104), and the other end of the first pipe (104) is connected to the upper surface of the cover (406). The first pipe (104) is a stretchable corrugated pipe.

8. The high-efficiency purification device for carbon product roasting furnace flue gas according to claim 7, characterized in that: The inner lower surface of the spiral slide tube (204) is provided with a drain hole.

9. The high-efficiency purification device for flue gas from a carbon product roasting furnace according to claim 7, characterized in that: The outer surface of the riser (207) is connected to a spiral tube (208), and multiple sets of atomizing nozzles (209) are connected at equal intervals along the spiral direction on the outer surface of the spiral tube (208); a spiral groove (210) is opened on the inner ring surface of the spiral slide tube (204), and the spiral tube (208) passes through the spiral groove (210), so that the atomizing nozzles (209) are located inside the spiral slide tube (204).

10. The high-efficiency purification device for flue gas from a carbon product roasting furnace according to claim 7, characterized in that: One end of the outer surface of the riser (207) is connected to the drain pipe (202), and the other end of the drain pipe (202) is sealed through the inside of the collection cylinder (101) to the outside and connected to the drain port of the water pump (201). The water pump (201) is fixedly installed on the upper surface of the support plate (1). A suction pipe (203) is connected to the suction port of the water pump (201), and the other end of the suction pipe (203) is sealed through the inside of the collection cylinder (101). A ball valve (102) is connected to one end of the outer surface of the collection cylinder (101). The ball valve (102) is used for the filling and discharge of the spray liquid.

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