A continuous refining furnace with a structure for removing carbonaceous particles from flue gas
By introducing oxygen into the ambient flue gas at the furnace entrance into the regenerated copper continuous refining furnace for combustion reactions with carbonaceous particulate matter in the process flue gas, the problem of carbonaceous particulate matter that cannot be captured by existing dust collectors is solved, and the purification of flue gas and the reduction of environmental pollution is achieved.
Patent Information
- Application Number
- CN202421501816.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the recycled copper continuous refining furnace, the carbonaceous particulate matter present in the process flue gas and the ambient flue gas at the furnace cannot be captured by the existing dust collector, resulting in the flue gas emissions containing particulate matter exceeding the standard and causing environmental pollution.
A continuous refining furnace with a flue gas carbonaceous particulate matter removal structure is designed. By introducing oxygen into the ambient flue gas at the furnace entrance, the carbonaceous particulate matter in the process flue gas is used to carry out combustion reactions, and combustion is achieved using the high-temperature waste heat of the process flue gas, and combustion is carried out in the continuous refining furnace flue through the charcoal structure.
It effectively eliminates carbonaceous particulate pollution from the refined exhaust chimney and ring-collection chimney exhaust outlets, realizes flue gas purification, and does not increase fuel consumption or total flue gas emissions.
Smart Images
Figure CN222718712U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of recycled copper refining equipment, in particular to a continuous refining furnace with a flue gas carbonaceous particle removal structure. Background Art
[0002] When the continuous refining furnace of secondary copper is in production (see Figure 1 ), the process flue gas generated in the furnace is sent to the refining bag dust collector through the continuous refining furnace flue to capture the particulate matter entrained in the flue gas, and the purified flue gas is discharged from the outlet of the refining tail gas chimney. The small amount of process flue gas leaking from the mouth of the refining furnace and the air around the mouth of the furnace are called the furnace mouth environmental flue gas, which are collected by the smoke hood and sent to the ring collection bag dust collector for treatment. The purified flue gas is discharged from the outlet of the ring collection chimney. The smoke hood is equipped with a ring collection valve.
[0003] The operation process of each heat of the continuous refining furnace is divided into four operation stages, namely "feeding insulation operation", "oxidation refining operation", "reduction refining" and "insulation casting operation". During the reduction refining operation, the gas reducing agent is passed into the copper liquid layer in the molten pool in the furnace through the reduction pipe passing through the furnace mouth to reduce the copper oxide contained in the copper liquid to metallic copper. In practice, some reducing agents enter the furnace without fully exerting their reducing effect, generate carbonaceous particulate matter under oxygen-deficient conditions, and enter the process flue gas of the continuous refining furnace. Since the particle size of carbonaceous particulate matter is very small (8.72-11.36 nanometers), it is far beyond the micron-level filtration accuracy range of the refining bag dust collector and cannot be captured by the refining bag dust collector. As a result, during the reduction refining of the continuous refining furnace, the flue gas discharged from the exhaust chimney of the refining tail gas exceeds the standard, causing environmental pollution. The ambient flue gas at the furnace mouth contains a certain amount of carbonaceous particulate matter, which cannot be captured by the ring collection bag dust collector, and there is also environmental pollution at the exhaust chimney of the ring collection chimney. Utility Model Content
[0004] The purpose of the utility model is to provide a continuous refining furnace with a flue gas carbonaceous particulate removal structure in view of the above situation. The continuous refining furnace is a local improvement on the traditional existing refining furnace system. The application of the utility model does not increase fuel consumption or the total amount of flue gas emissions.
[0005] The specific scheme of the utility model is: a continuous refining furnace with a flue gas carbonaceous particle removal structure, comprising a refining reverberatory furnace body, a smoke collecting hood is arranged at the inlet of the refining reverberatory furnace body, a ring collecting bag dust collector and a ring collecting chimney are connected to the smoke collecting hood through a ring collecting pipe, a ring collecting valve is arranged on the ring collecting pipe, the top of the refining reverberatory furnace body is connected to a refining bag dust collector and a refining tail gas chimney through a continuous refining furnace flue, a smoke induced pipe is connected to the middle position of the ring collecting pipe above the smoke collecting hood, a smoke induced pipe valve is arranged on the smoke induced pipe; a smoke induced machine is also arranged, the inlet of the smoke induced machine is connected to the end of the smoke induced pipe, the outlet of the smoke induced machine is connected to an oxygen supply pipe, the end of the oxygen supply pipe is connected to a charcoal burning structure, and the charcoal burning structure is connected to the continuous refining furnace flue.
[0006] Furthermore, the charcoal burning structure described in the utility model is composed of an oxygenator and a positioning seat, wherein the positioning seat is placed on the top of the continuous refining furnace flue and is cast by casting material; a penetrating circular hole is provided in the middle of the positioning seat, and the lower end of the oxygenator is inserted into the continuous refining furnace flue through the circular hole, and the upper end of the oxygenator is connected to a 90° elbow through a flange, and the 90° elbow is connected to the oxygen supply pipe.
[0007] Furthermore, the oxygenator described in the utility model is made of a steel round tube, and the lower end of the oxygenator extends into the flue of the continuous refining furnace by 150 mm.
[0008] Furthermore, the width of the positioning seat in the utility model is 300-1000 mm, and the thickness of the positioning seat is the same as the flue cover plate on the flue of the continuous refining furnace.
[0009] Furthermore, in the utility model, a decoking structure is also provided on the 90° elbow, and the decoking structure comprises a decoking pipe, which is vertically arranged on the 90° elbow and communicated with the decoking pipe, and the decoking pipe is coaxially arranged with the oxygenator, and the upper port of the decoking pipe is connected to a sealing plate through a flange, and a lifting ring is provided on the top surface of the sealing plate.
[0010] Furthermore, the decoking tube described in the utility model is a steel round tube made of Q235.
[0011] Furthermore, an oxygen supply valve is provided on the oxygen supply pipe in the utility model.
[0012] Furthermore, the smoke exhaust fan described in the utility model is a centrifugal fan.
[0013] The continuous refining furnace of the utility model contains a structure for removing carbonaceous particles from flue gas, and utilizes oxygen in the "furnace mouth ambient flue gas" as a combustion aid for carbonaceous particles in the process flue gas of the continuous refining furnace during reduction refining, and simultaneously utilizes the high-temperature waste heat of the process flue gas itself to realize the combustion reaction, while eliminating the pollution of carbonaceous particles at the exhaust port of the refining tail gas chimney and the exhaust port of the ring chimney; and does not increase fuel consumption or the total amount of flue gas emissions; the utility model has a simple process flow, low investment and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the relevant structure of the existing continuous refining furnace;
[0015] Figure 2 It is a structural schematic diagram of the utility model;
[0016] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at K in the middle;
[0017] Figure 4 yes Figure 3 Schematic diagram of the structure from a top-down perspective.
[0018] In the figure: 1—ring-shaped chimney, 2—ring-shaped bag dust collector, 3—ring-shaped valve, 4—smoke collecting hood, 5—continuous refining furnace flue, 6—refining tail gas chimney, 7—refining bag dust collector, 8—refining reverberatory furnace body, 9—furnace mouth, 10—reduction pipe, 11—smoke duct, 12—smoke duct valve, 13—smoke duct machine, 14—oxygen supply pipe, 15—oxygen supply valve, 16—sealing plate, 17—lifting ring, 18—coke cleaning pipe, 19—90° elbow, 20—positioning seat, 21—oxygen supply device. DETAILED DESCRIPTION
[0019] The following will be combined with the accompanying drawings of the utility model to clearly and completely describe the technical solution of the utility model. It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the utility model. In the description of the utility model, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0021] See also Figure 2 to Figure 4 The utility model is a continuous refining furnace with a flue gas carbonaceous particle removal structure, which comprises a refining reverberatory furnace body 8, a smoke collecting hood 4 is arranged at the furnace mouth 9 of the refining reverberatory furnace body, a ring collecting bag dust collector 2 and a ring collecting chimney 1 are connected to the smoke collecting hood through a ring collecting pipe, a ring collecting valve 3 is arranged on the ring collecting pipe, a refining bag dust collector 7 and a refining tail gas chimney 6 are connected to the top of the refining reverberatory furnace body through a continuous refining furnace flue 5, a smoke duct 11 is connected to the middle position of the ring collecting pipe above the smoke collecting hood, a smoke duct valve 12 is arranged on the smoke duct; a smoke duct fan 13 is also arranged, further, the smoke duct fan described in the utility model is a centrifugal fan, the inlet of the smoke duct fan is connected to the end of the smoke duct, the outlet of the smoke duct fan is connected to an oxygen supply pipe 14, the end of the oxygen supply pipe is connected to a charcoal burning structure, and the charcoal burning structure is connected to the described continuous refining furnace flue; further, an oxygen supply valve 15 is arranged on the oxygen supply pipe described in the utility model.
[0022] Furthermore, the charcoal burning structure described in this embodiment is composed of an oxygenator 21 and a positioning seat 20, wherein the positioning seat is placed on the top of the continuous refining furnace flue and is cast and formed by casting material; a through circular hole is set in the middle of the positioning seat, and the lower end of the oxygenator is inserted into the continuous refining furnace flue through the circular hole, and the upper end of the oxygenator is connected to a 90° elbow 19 through a flange, and the 90° elbow is connected to the oxygen supply pipe. Further, the oxygenator described in the utility model is made of a steel round tube, and the lower end of the oxygenator extends into the continuous refining furnace flue by 150mm. Further, the width of the positioning seat described in the utility model is 300 to 1000mm, and the thickness of the positioning seat is the same as the flue cover plate above the continuous refining furnace flue. Furthermore, in the utility model, a coke clearing structure is also provided on the 90° elbow, and the coke clearing structure has a coke clearing pipe 18, which is vertically arranged on the 90° elbow and communicated therewith, and the coke clearing pipe is coaxially arranged with the oxygenator, and the upper end of the coke clearing pipe is connected to a sealing plate 16 through a flange, and a hoisting ring 17 is provided on the top surface of the sealing plate. Furthermore, the coke clearing pipe in the utility model is a steel round pipe made of Q235.
[0023] The smoke extraction device of the ring-collected smoke is composed of a smoke extraction machine, a smoke extraction pipe, and an oxygen supply pipe. The smoke extraction machine is a centrifugal fan with a total pressure of 3400Pa and a flow rate of 3200m 3 / h; the smoke duct inlet is connected to the smoke hood with a smoke duct pipe, and a smoke duct valve is installed on the smoke duct; the smoke duct outlet is connected to the front end of the oxygen supply pipe, and an oxygen supply pipe valve is installed on the oxygen supply pipe, with a 90° elbow at the end. Both the smoke duct pipe and the oxygen supply pipe are steel round pipes, made of Q235. The smoke duct valve is an electric butterfly valve; the oxygen supply pipe valve is a high-temperature electric butterfly valve, T=400℃.
[0024] The carbon burning structure consists of an oxygenator and a positioning seat. The oxygenator is a steel round tube with the same diameter as the oxygenator pipe and made of 310S. The oxygenator is connected to the 90° elbow at the end of the oxygenator pipe by flange connection. The length of the oxygenator extending into the flue is 150mm. The positioning seat is installed on the top of the continuous refining furnace flue. Its length is the same as the width of the continuous refining furnace flue, 500mm, and its thickness is the same as the cover plate on the flue, 240mm. The positioning seat is cast with high-aluminum steel fiber castable, and a through round hole is set in the middle to accommodate the insertion of the oxygenator.
[0025] The coke clearing structure consists of a coke clearing tube and a sealing plate. The coke clearing tube is a steel round tube made of Q235, which is vertically installed on the elbow of the oxygen supply pipe and is concentric with the oxygen supply device. The sealing plate is connected to the coke clearing tube with a flange, and a lifting ring is provided on the sealing plate. The sealing plate and the lifting ring are both made of Q235.
[0026] The utility model is used as follows: when the continuous refining furnace is performing reduction refining, the annular collection valve is closed, and the valve of the smoke duct, the smoke duct machine, and the valve of the oxygen supply pipe are opened. The ambient smoke at the furnace mouth of the refining furnace is collected by the smoke collection hood, and then, under the suction of the smoke duct machine, it passes through the smoke duct, the oxygen supply pipe, and the oxygen supply device in sequence into the flue of the continuous refining furnace and is mixed with the process smoke of the "continuous refining furnace".
[0027] During reduction refining, the process flue gas temperature of the continuous refining furnace is 1000-1300℃, which exceeds the ignition temperature of carbonaceous particles (500-600℃), but the process flue gas does not contain oxygen and cannot support combustion; the oxygen concentration in the ambient flue gas at the furnace mouth is close to that of air.
[0028] After the furnace mouth ambient flue gas is mixed with the continuous refining furnace process flue gas, the temperature of the mixed flue gas is 800-1100°C, which exceeds the ignition temperature of the carbonaceous particulate matter; the carbonaceous particulate matter in the continuous refining furnace process flue gas and the oxygen contained in the furnace mouth ambient flue gas undergo combustion reaction at high temperature and are burned out within 1-2 seconds. The combustion product is carbon dioxide gas, and the carbonaceous particulate matter in the process flue gas is thus removed.
[0029] On the other hand, the flue gas from the furnace mouth during reduction refining is no longer sent to the ring-collecting bag filter for treatment, and carbonaceous particulate matter will not enter the ring-collecting chimney outlet, eliminating environmental pollution from the ring-collecting chimney.
[0030] After the reduction refining in the continuous refining furnace is completed, open the ring valve and close the smoke duct valve, smoke duct fan and oxygen supply pipe valve.
[0031] When the continuous refining furnace is shut down for feeding, the sealing plate on the coke cleaning tube is lifted through the lifting ring, and the coke in the oxygenator is cleaned with tools such as pneumatic picks and steel chisels to keep the oxygenator unobstructed.
[0032] The continuous refining furnace of the utility model contains a structure for removing carbonaceous particles from flue gas, and utilizes oxygen in the ambient flue gas at the furnace mouth as a combustion aid for carbonaceous particles in the process flue gas of the continuous refining furnace during reduction refining, and simultaneously utilizes the high-temperature waste heat of the process flue gas itself to realize the combustion reaction, while eliminating the pollution of carbonaceous particles at the exhaust port of the refining tail gas chimney and the exhaust port of the ring collecting chimney; and does not increase fuel consumption or the total amount of flue gas emissions; the utility model has a simple process flow, low investment and easy operation.
Claims
1. A continuous refining furnace with a flue gas carbonaceous particulate removal structure, comprising a refining reverberatory furnace body, a smoke collecting hood is provided at the entrance of the refining reverberatory furnace body, a ring collecting bag dust collector and a ring collecting chimney are connected to the smoke collecting hood through a ring collecting pipeline, a ring collecting valve is provided on the ring collecting pipeline, and a refining bag dust collector and a refining tail gas chimney are connected to the top of the refining reverberatory furnace body through a continuous refining furnace flue, characterized in that: A smoke duct is connected to the middle position of the annular collecting pipe above the smoke collecting hood, and a smoke duct valve is arranged on the smoke duct; a smoke duct fan is also provided, the inlet of the smoke duct fan is connected to the end of the smoke duct, and the outlet of the smoke duct fan is connected to an oxygen supply pipe, and the end of the oxygen supply pipe is connected to a charcoal burning structure, which is connected to the flue of the continuous refining furnace.
2. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 1, characterized in that: The charcoal burning structure is composed of an oxygenator and a positioning seat, wherein the positioning seat is placed on the top of the continuous refining furnace flue and is cast by casting material; a penetrating circular hole is arranged in the middle of the positioning seat, and the lower end of the oxygenator is inserted into the continuous refining furnace flue through the circular hole, and the upper end of the oxygenator is connected to a 90° elbow through a flange, and the 90° elbow is connected to the oxygen supply pipe.
3. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 2, characterized in that: The oxygenator is made of a steel round tube, and the lower end of the oxygenator extends into the flue of the continuous refining furnace by 150 mm.
4. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 2, characterized in that: The width of the positioning seat is 300-1000 mm, and the thickness of the positioning seat is the same as the flue cover plate on the flue of the continuous refining furnace.
5. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 2, characterized in that: A decoking structure is also provided on the 90° elbow. The decoking structure comprises a decoking pipe, which is vertically arranged on the 90° elbow and communicated with the decoking pipe. The decoking pipe is coaxially arranged with the oxygenator. The upper port of the decoking pipe is connected to a sealing plate through a flange, and a lifting ring is provided on the top surface of the sealing plate.
6. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 5, characterized in that: The decoking tube is a steel round tube made of Q235.
7. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 1, characterized in that: The oxygen supply pipe is provided with an oxygen supply valve.
8. The continuous refining furnace with a structure for removing carbonaceous particles from flue gas according to claim 1, characterized in that: The smoke exhaust fan is a centrifugal fan.