Large roasting furnace
By setting a central cylinder and tangential burners inside the roasting furnace, the problem of uneven temperature gradient in large roasting furnaces was solved, thereby improving the processing capacity of a single furnace and increasing production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-04-03
AI Technical Summary
In the process of scaling up existing roasting furnaces, especially due to uneven temperature gradients at the furnace center, acid recovery rates are low, and the processing capacity of a single furnace is insufficient, making it difficult to meet process requirements.
Design a large roasting furnace, including a furnace body, a furnace cover and a central cylinder. The central cylinder is set in the furnace body to increase the diameter, and multiple spray guns are set on the furnace cover and tangential burners are set on the side wall of the furnace body to improve temperature control.
This has increased the processing capacity of a single furnace, improved production efficiency and reduced production costs, while also improving the temperature gradient distribution and increasing the acid recovery rate.
Smart Images
Figure CN224080206U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of roasting furnace technology, and in particular to a large roasting furnace. Background Technology
[0002] In acid regeneration technology, an acid pickling line is required for production. The specific production process is as follows:
[0003] The first step is to collect the waste acid from the pickling line into a waste acid storage tank. The storage capacity of the waste acid storage tank ensures that the acid regeneration station can operate continuously independently of the pickling line.
[0004] The second step is to use a pump to send the waste acid from the storage tank to the acid filter to separate and filter the solid particles and undissolved residues generated during the acid washing process.
[0005] The third step is that the filtered waste acid enters the bottom of the pre-concentrator through the pneumatic valve. The pneumatic valve automatically controls the liquid level at the bottom of the pre-concentrator. A constant amount of waste acid flows from the pre-concentrator into the circulating pump for circulating spraying, and directly exchanges heat with the hot gas in the calcining furnace for evaporation and concentration.
[0006] The fourth step is to concentrate the waste acid and pressurize it into the top spray gun of the furnace through the pressure pump of the roasting furnace. The spray gun is equipped with a nozzle and can be automatically immersed into the furnace. The spray gun is equipped with a filter to prevent the nozzle from clogging. In the hot zone of the furnace, FeCl2 undergoes thermal decomposition according to the following formula: 2FeCl2+2H2O+1 / 2O2=Fe2O3(s)+4HCl(g).
[0007] The fifth step involves the initial iron oxide powder at the top of the furnace, which is a hollow sphere with a diameter of about 0.2 μm. During its descent, it floats upward due to being carried by the counter-current vortex gas. Upon encountering the sprayed acid solution again, the particle size gradually increases. The iron oxide that falls to the bottom of the furnace is also a hollow sphere with a diameter of about tens of micrometers. It is discharged through a sealed rotary valve. Below the rotary valve is a hot spiral conveyor with a small burner. Combustion further reduces the residual chlorine content in the oxide. The fuel gas is returned to the roasting furnace, and the Fe2O3 powder enters the bagging machine through the sealed rotary valve at the bottom of the silo.
[0008] With the development of my country's iron and steel metallurgical industry, especially the rapid development of hydrometallurgy in the non-ferrous metals industry in recent years, the demand for larger roasting furnaces is becoming increasingly urgent. However, the current spray roasting furnaces suffer from excessive temperature gradients due to furnace shape limitations, especially in the center of the furnace. Because the temperature near the furnace wall cannot be too high, the larger the furnace diameter, the lower the temperature at the center, which inevitably seriously affects the acid recovery rate. The maximum waste acid processing capacity of a single furnace is 12m³. 3 If the processing load continues to increase, the required diameter of the roasting furnace will be too large, making it difficult to meet the process requirements. Utility Model Content
[0009] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a large-scale roasting furnace.
[0010] The objective of this utility model is achieved through the following technical solution:
[0011] A large roasting furnace includes a furnace body, a furnace cover, and a central cylinder. The furnace cover is sealed on the upper end of the furnace body and a flue gas exhaust pipe is provided on the furnace cover. A furnace door is provided on the side wall of the furnace body. The central cylinder is fixedly installed in the middle of the furnace body. Tangential burners are provided on the side wall of the furnace body.
[0012] Furthermore, both the furnace body and the central cylinder have circular cross-sections and are coaxially arranged.
[0013] Furthermore, the lower end of the central cylinder is connected to the inner wall of the furnace body via a lower support, and the upper end of the central cylinder is connected to the furnace cover via an upper support.
[0014] Furthermore, the furnace cover is provided with multiple spray guns, which are positioned between the inner wall of the furnace body and the outer wall of the central cylinder.
[0015] Furthermore, at least two tangential burners are evenly arranged on the side wall of the furnace body.
[0016] Furthermore, the furnace body includes an outer shell layer, a lightweight layer, and a refractory brick layer, with the lightweight layer disposed within the outer shell layer and the refractory brick layer disposed within the lightweight layer.
[0017] Furthermore, the flue gas exhaust pipe is fixedly installed on the middle part of the furnace cover and is arranged horizontally.
[0018] Furthermore, the furnace body includes a cylindrical section and a conical section. The upper end of the cylindrical section is sealed and fixedly connected to the furnace cover, and the lower end of the cylindrical section is sealed and fixedly connected to the large-diameter end of the conical section. A discharge port is provided on the small-diameter end of the conical section.
[0019] Furthermore, the central cylinder is a hollow cylinder.
[0020] Furthermore, a thermometer interface is provided on the side wall of the furnace body.
[0021] The beneficial effects of this utility model are:
[0022] 1) In this technology, a central cylinder is set inside the furnace body, and the furnace diameter can reach more than 15 meters, with a single furnace processing capacity of up to 20m³. 3 With a capacity of over 1000 kilowatt-hours, compared to the original furnace type, a single furnace can increase its load by 70%, which can effectively improve production efficiency and reduce production costs.
[0023] 2) In this technology, multiple spray guns are installed on the furnace cover, which can spray out a large amount of waste acid at the same time for processing.
[0024] 3) In this technology, multiple tangential burners are evenly arranged on the furnace body, which allows for better temperature control. Attached Figure Description
[0025] Figure 1 A schematic diagram of the internal connection structure of a large roasting furnace;
[0026] Figure 2 This is a schematic diagram of the connection structure between the tangential burner and the furnace body.
[0027] In the diagram, 1-furnace body, 2-furnace cover, 3-central cylinder, 4-flue gas exhaust pipe, 5-tangential burner, 6-furnace door, 7-lower support, 8-upper support, 9-spray gun, 10-discharge port, 11-thermometer interface. Detailed Implementation
[0028] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0029] See Figures 1-2 This utility model provides a technical solution:
[0030] A large roasting furnace includes a furnace body 1, a furnace cover 2, and a central cylinder 3. The furnace cover 2 is sealed at the upper end of the furnace body 1, and a flue gas exhaust pipe 4 is provided on the furnace cover 2. A furnace door 6 is provided on the side wall of the furnace body 1. The central cylinder 3 is fixedly installed in the middle of the furnace body 1, and tangential burners 5 are provided on the side wall of the furnace body 1. The lower end of the central cylinder 3 is connected to the inner wall of the furnace body 1 through a lower support 7, and the upper end of the central cylinder 3 is connected to the furnace cover 2 through an upper support 8. The central cylinder 3 is a hollow cylinder. The central cylinder 3, lower support 7, and upper support 8 are all made of heat-resistant steel, with external protection from existing refractory materials. The furnace body 1 and furnace cover 2 are sealed together. The upper support 8 on the furnace cover 2 is used to lift the upper end of the central cylinder 3, and the lower support 7 is placed on the furnace body 1 to support the upper end of the central cylinder 3. To reduce weight, the central cylinder 3 is hollow. The upper end of the central cylinder 3 is sealed to prevent waste acid from entering, and the lower end has a through hole. Tangential burners 5 are used to heat the furnace body 1. The central cylinder 3 in the middle of this roasting furnace allows the diameter of the furnace body 1 to reach over 15 meters, and the processing capacity of a single furnace to reach 20 cubic meters. 3With a capacity of over 1000 liters per hour, compared to the original furnace type, a single furnace can increase the load by 70%, which can effectively reduce enterprise investment costs, improve processing efficiency, and facilitate temperature control.
[0031] In some embodiments, the furnace body 1 and the central cylinder 3 both have circular cross-sections and are coaxially arranged. This circular and coaxial arrangement of the furnace body 1 and the central cylinder 3 facilitates temperature control and also allows for the uniform arrangement of the spray gun 9 and the tangential burner 5.
[0032] In some embodiments, a plurality of spray guns 9 are provided on the furnace cover 2, and the spray guns 9 are disposed between the inner wall of the furnace body 1 and the outer wall of the central cylinder 3. The plurality of spray guns 9 are arranged in a circular pattern and coaxially with the furnace body 1, and the spray guns 9 are made of Al2O3 material. At least two spray guns 9 are provided, and commonly five or six are provided. The spray guns 9 are disposed in the annular gap between the furnace body 1 and the central cylinder 3, effectively avoiding the problem of unsatisfactory temperature processing due to excessively low center temperature in the original furnace design, and also thoroughly improving the temperature gradient distribution within the furnace.
[0033] In some embodiments, at least two tangential burners 5 are uniformly arranged on the side wall of the furnace body 1. The tangential burners 5 are located at the connection between the cylindrical and conical sections, and two, three, four, or even more tangential burners 5 may be provided. The tangential burners 5 are arranged tangentially along the furnace body 1, and the flame and gas flow direction on the tangential burners 5 maintains a spiral upward direction within the annular gap. Because the annular gap area is slightly smaller than the original furnace type, the heat transfer effect is improved, which is beneficial to the chemical reactions within the furnace body 1.
[0034] In some embodiments, the furnace body 1 includes an outer shell layer, a lightweight layer, and a refractory brick layer. The lightweight layer is disposed within the outer shell layer, and the refractory brick layer is disposed within the lightweight layer. The outer shell layer is made of stainless steel, the lightweight layer is made of alumina, and the refractory brick layer is constructed using existing refractory brick sealing methods. The alumina layer is sandwiched between the stainless steel layer and the refractory bricks. The refractory brick layer, located internally, can withstand high temperatures and prevent corrosion.
[0035] In some embodiments, the flue gas exhaust pipe 4 is fixedly installed on the middle of the furnace cover 2 and is arranged horizontally. The flue gas exhaust pipe 4 is L-shaped, with its vertical section sealed and fixed to the furnace cover 2 and coaxial with it. The furnace cover 2 is spherical, and the flue gas exhaust pipe 4 is connected to the top of the furnace cover 2 for easy smoke removal. The end of the flue gas exhaust pipe 4 is horizontal to prevent rainwater or foreign objects from entering the furnace body 1 through the flue gas exhaust pipe 4.
[0036] In some embodiments, the furnace body 1 includes a cylindrical section and a conical section. The upper end of the cylindrical section is sealed and fixedly connected to the furnace cover 2, and the lower end of the cylindrical section is sealed and fixedly connected to the large-diameter end of the conical section. A discharge port 10 is provided on the small-diameter end of the conical section. Both the cylindrical and conical sections are provided with an outer shell layer, a lightweight layer, and a refractory brick layer. In the prior art, a sealing rotary valve is provided on the discharge port 10.
[0037] In some embodiments, a thermometer interface 11 is provided on the side wall of the furnace body 1. During the processing, the temperature at the top of the furnace body 1 is controlled at about 400°C, and the temperature near the tangential burner 5 is controlled at 600-700°C. Therefore, multiple thermometer interfaces 11 are provided on the upper and lower sides of the furnace body 1. The thermometer interfaces 11 are used to install thermometers in the prior art.
[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "bottom", "one end", "top", "middle", "other end", "coaxial", "one side", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "setting", "installation", "connection", "fixing", "hinged" and other such terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0040] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.
Claims
1. A large roasting furnace, characterized in that: The furnace includes a furnace body (1), a furnace cover (2), and a central cylinder (3). The furnace cover (2) is sealed on the upper end of the furnace body (1). A flue gas exhaust pipe (4) is provided on the furnace cover (2). A furnace door (6) is provided on the side wall of the furnace body (1). The central cylinder (3) is fixedly provided on the middle part of the furnace body (1). A tangential burner (5) is provided on the side wall of the furnace body (1).
2. A large-scale roasting furnace according to claim 1, characterized in that: The furnace body (1) and the central cylinder (3) both have circular cross sections and are coaxially arranged.
3. A large-scale roasting furnace according to claim 1 or 2, characterized in that: The lower end of the central cylinder (3) is connected to the inner wall of the furnace body (1) through the lower support (7), and the upper end of the central cylinder (3) is connected to the furnace cover (2) through the upper support (8).
4. A large roasting furnace according to claim 1 or 2, characterized in that: The furnace cover (2) is provided with a plurality of spray guns (9), which are located between the inner wall of the furnace body (1) and the outer wall of the central cylinder (3).
5. A large roasting furnace according to claim 1 or 2, characterized in that: At least two tangential burners (5) are evenly arranged on the side wall of the furnace body (1).
6. A large roasting furnace according to claim 1 or 2, characterized in that: The furnace body (1) includes an outer shell layer, a lightweight layer and a refractory brick layer, wherein the lightweight layer is disposed within the outer shell layer and the refractory brick layer is disposed within the lightweight layer.
7. A large roasting furnace according to claim 1 or 2, characterized in that: The flue gas exhaust pipe (4) is fixedly installed on the middle part of the furnace cover (2) and is arranged horizontally.
8. A large roasting furnace according to claim 1 or 2, characterized in that: The furnace body (1) includes a cylindrical section and a conical section. The upper end of the cylindrical section is sealed and fixedly connected to the furnace cover (2). The lower end of the cylindrical section is sealed and fixedly connected to the large diameter end of the conical section. A discharge port (10) is provided on the small diameter end of the conical section.
9. A large roasting furnace according to claim 1 or 2, characterized in that: The central cylinder (3) is a hollow cylinder.
10. A large roasting furnace according to claim 1 or 2, characterized in that: A thermometer interface (11) is provided on the side wall of the furnace body (1).