Water-cooling centrifugal spheroidal graphite cast iron pipe annealing system
By setting up multiple spaced burners in the annealing furnace body and optimizing the segmented blowing method of combustion air, the problem of inaccurate air distribution in the existing annealing furnace is solved, and more efficient combustion and energy utilization are achieved.
Patent Information
- Application Number
- CN202421796148.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The air-fuel ratio distribution in existing annealing furnaces is inaccurate, resulting in increased energy consumption.
A water-cooled centrifugal ductile iron pipe annealing system is adopted. By setting up multiple spaced burners in the annealing furnace body, and setting up combustion-assist ports between the fuel port and the flame-breathing port, respectively, the combustion-assist fan is connected to the burner structure to optimize the burner structure to inject the combustion-assist air in sections to ensure that the fuel is fully burned and the flame strength is increased.
By optimizing the burner structure, the problem of inaccurate air-fuel ratio is solved, making the combustion reaction more complete, improving combustion efficiency and reducing fuel consumption.
Smart Images
Figure CN222907993U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cast pipe production, in particular to a water-cooled centrifugal ductile iron pipe annealing system. Background Art
[0002] Annealing process is widely used in production. There are many annealing process specifications according to the different purposes of annealing required by the workpiece, and the commonly used ones are full annealing, spheroidizing annealing and stress relief annealing. Annealing process refers to a metal heat treatment process in which the metal is heated to a certain temperature, kept for a sufficient time, and then cooled at an appropriate speed (usually slow cooling, sometimes controlled cooling). It can reduce hardness, improve machinability, reduce residual stress, stabilize size, reduce deformation and crack tendency, refine grains, adjust organization, eliminate organizational defects, uniform material organization and composition, improve material properties or prepare organization for subsequent heat treatment.
[0003] Most of the annealing methods currently used use an annealing furnace process to anneal the cast pipe, and the annealing furnace process anneals the cast-molded pipe body in order to reduce the cementite on the cast pipe. In the prior art, coke oven gas is burned in an annealing furnace, and a fan is used to blow in combustion-supporting air according to the ratio of air and fuel to increase the degree of combustion of the flame. The annealing process from entering the furnace to leaving the furnace is respectively divided into a heating section, a heat preservation section, a fast cooling section and a slow cooling section. In the annealing furnace, the cast pipe is driven by a chain to complete the annealing process. However, in the existing annealing process, due to the inaccurate air and fuel ratio in the annealing furnace, energy consumption increases and the like. Utility Model Content
[0004] The utility model provides a water-cooled centrifugal ductile iron pipe annealing system to solve the technical problem of increased energy consumption caused by inaccurate air-fuel ratio adjustment.
[0005] In order to solve the above problems, the utility model provides a water-cooled centrifugal ductile iron pipe annealing system, comprising an annealing device, the annealing device comprising: an annealing furnace body and a plurality of burners arranged at intervals in the annealing furnace body;
[0006] The burner has a fuel port and a flame nozzle, the fuel port is connected to a fuel pipeline, one side of the fuel pipeline is provided with a combustion-supporting port 1, the burner also has a combustion-supporting port 2 located between the fuel port and the flame nozzle, and the combustion-supporting port 1 and the combustion-supporting port 2 are respectively connected to combustion-supporting fans.
[0007] The utility model also includes the following technical solution: each of the combustion-supporting fans is connected to an air supply pipeline, and a heating structure is provided on the air supply pipeline to heat the air flowing through.
[0008] The present utility model further includes the following technical solutions: The heating structure is a heat exchanger, and a waste heat blower communicating with the furnace body is further provided on the annealing device, and the waste heat blower is connected to the heat exchanger.
[0009] The present utility model further includes the following technical solutions: A valve is provided on the fuel pipeline, and the first combustion air inlet is provided between the valve and the fuel port.
[0010] The present utility model further includes the following technical solutions: The annealing system for water-cooled centrifugal ductile iron pipes includes a sand blowing device for sand blowing on the water-cooled centrifugal ductile iron pipes entering the annealing device, and the sand blowing device includes a conveying mechanism and a blowing air pipe on one side of the conveying mechanism.
[0011] The present utility model further includes the following technical solutions: The blowing air pipes are multiple and are respectively arranged on the upper part and / or the horizontal side part of the conveying mechanism.
[0012] The present utility model further includes the following technical solutions: A detection device is further provided on one side of the sand blowing device away from the annealing furnace body, and the detection device includes a conveying frame, a supporting wheel rotatably installed on the conveying frame, and a detection mechanism located above the supporting wheel.
[0013] The beneficial effects of the present utility model are:
[0014] By optimizing the structure of the burner, a fuel pipeline is connected to the fuel port, a first combustion air inlet is provided on one side of the fuel pipeline, a second combustion air inlet is further provided between the fuel port and the flame spraying port, the first combustion air inlet and the second combustion air inlet are respectively connected with a combustion air blower, the combustion air blower blows combustion air into the first combustion air inlet to mix the combustion air with the fuel before combustion to increase the temperature of the fuel, and then the combustion air blower blows combustion air into the second combustion air inlet to ensure full combustion of the fuel and increase the flame intensity at the same time, solve the problem of inaccurate air-fuel ratio, make the combustion reaction more complete, thereby improving the combustion efficiency and reducing the fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:
[0016] Figure 1 is a schematic diagram of the annealing system in the present utility model;
[0017] Figure 2 is a schematic diagram of the burner in the present utility model;
[0018] Figure 3 is a schematic diagram of the sand blowing device in the present utility model;
[0019] Figure 4 This is another schematic diagram of the sandblasting device in the present utility model.
[0020] Explanation of reference numerals:
[0021] 100, cast pipe; 1, annealing device; 11, annealing furnace body; 12, burner; 121, fuel port; 122, flame jet port; 123, primary combustion air port; 124, secondary combustion air port; 13, fuel pipeline; 14, combustion air blower; 15, air supply pipeline; 16, heating structure; 17, waste heat blower; 18, medium tank; 2, valve; 3, sandblasting device; 31, conveying mechanism; 32, sandblasting pipe; 4, detection device; 41, conveying rack; 42, supporting wheel; 43, detection mechanism; 5, storage rack. Specific embodiments
[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.
[0023] In the description of the present application, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In the present application, for the sake of convenience of understanding, the length direction of the annealing furnace is defined as left and right, the width direction is defined as front and back, and the height direction is defined as up and down. Specific embodiment 1:
[0025] As Figure 1 shown, in this embodiment, a system for annealing water-cooled centrifugal ductile iron pipes is provided, including an annealing device 1, a valve 2, a sandblasting device 3, a detection device 4, and a storage rack 5. The storage rack 5 is placed on one side of the detection device 4. The detection device 4, the sandblasting device 3, and the annealing device 1 are arranged at intervals from left to right in sequence, making the annealing process of the cast pipe 100 neat and orderly.
[0026] As Figure 1As shown in the figure, the annealing device 1 includes an annealing furnace body 11 and burners 12. A plurality of burners 12 are spaced and installed inside the annealing furnace body 11. The use of a plurality of burners 12 facilitates quickly raising the temperature inside the annealing furnace body 11. The annealing furnace body 11 is generally made of metal materials to avoid damage caused by high temperatures.
[0027] As Figure 2 shown in the figure, the burner 12 includes a fuel port 121, a flame ejection port 122, and a secondary combustion air port 124. A fuel pipeline 13 is connected to the fuel port 121. A primary combustion air port 123 is provided on one side of the fuel pipeline 13, and the secondary combustion air port 124 is located between the fuel port 121 and the flame ejection port 122. The primary combustion air port 123 and the secondary combustion air port 124 are respectively connected to a combustion air blower 14. The fuel port 121 of the burner 12 is connected to a fuel tank. The burner 12 is filled with fuel through the fuel port 121 to ensure the combustion of the burner 12. The flame ejection port 122 is used to eject flames for the high-temperature combustion of the cast pipe 100. The combustion air blower 14 can be used to blow combustion air into the primary combustion air port 123 and the secondary combustion air port 124. In this embodiment, the combustion air is high-temperature air. The primary combustion air port 123 is located on the fuel pipeline 13 in the front section of the fuel port 121. At this time, the fuel has not yet burned, so that the fuel and the combustion air are fully mixed before fuel combustion, increasing the temperature of the fuel and facilitating the rapid combustion of the fuel. The secondary combustion air port 124 is installed in the rear section of the fuel port 121. At this time, the fuel has already burned. The combustion air can ensure the full combustion of the fuel while increasing the flame intensity. By optimizing the structure of the burner 12, the method of blowing combustion air in segments ensures more complete combustion, thereby suppressing the generation of nitrogen oxides in the furnace body, solving the problem of inaccurate air-fuel ratio, making the combustion reaction more complete, thus improving the combustion efficiency and reducing fuel consumption.
[0028] The combustion air blower 14 is a variable-frequency blower. The combustion air blower 14 adopts variable-frequency start and operates at a high speed of 50 hz during annealing to reasonably control the air usage. When not annealing, through program control, the variable-frequency operating frequency drops to 20 hz to reduce the air usage, ensuring the reasonable use of air and reducing energy consumption.
[0029] As Figure 2 shown in the figure, a valve 2 is also provided on the fuel pipeline 13. The primary combustion air port 123 is provided between the valve 2 and the fuel port 121. The valve 2 is used to reasonably control the fuel delivery volume to improve the resource utilization rate.
[0030] As Figure 1 shown in the figure, an air supply pipeline 15 is connected to each combustion air blower 14. The air supply pipeline 15 is connected to a heating structure 16 to heat the air flowing through the heating structure 16. The heated air flows into the combustion air blower 14 through the air supply pipeline 15 and is blown into the burner 12 by the combustion air blower 14, facilitating the provision of high-temperature air for the combustion air blower 14.
[0031] In this embodiment, the heating structure 16 is a heat exchanger, which is installed at the front and / or rear of the annealing furnace body 11 through the air supply line 15. According to the actual production situation, the heat exchanger is installed at the front or rear of the annealing furnace body 11, and is connected to the combustion-supporting fan 14 through the air supply line 15. The heat exchanger converts ordinary air into high-temperature air. In this embodiment, the heat exchanger preheats the air to 450°C high-temperature air, which can greatly improve the energy saving effect. The medium tank 18 transports the medium to the heat exchanger through the air supply line 15. The air supply line 15 is also provided with a valve 2. The delivery amount of the medium is reasonably controlled by the valve 2 to improve resource utilization. In this embodiment, the medium is air. Of course, in other embodiments, the medium can be other high-temperature gases without too many restrictions.
[0032] like Figure 1 As shown, one end of the waste heat blower 17 is connected to the annealing furnace body 11, and the other end is connected to the heat exchanger. The waste heat blower 17 transports the waste heat generated in the annealing furnace body 11 to the heat exchanger, and then transports it to the burner 12 through the combustion-supporting blower 14, or the waste heat is transported to the curing furnace through the waste heat blower 17. Since the cast pipe 100 has a paint spraying operation in the subsequent process, the waste heat can accelerate the cooling of the paint, which solves the problem of direct discharge of waste heat and waste of heat source, improves the utilization rate of waste heat, and saves resources.
[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the sand blasting device 3 includes a conveying mechanism 31 and a blowing pipe 32. In this embodiment, there are two blowing pipes 32. In other embodiments, the number of blowing pipes 32 can be selected according to actual needs. The main function of the sand blasting device 3 is to blow away and clean the iron sand, iron filings or some other casting residues remaining on the casting pipe 100 entering the annealing device 1. Specifically, Figure 3 As shown, the casting pipe 100 is placed on the conveying mechanism 31, and a blowing pipe 32 is provided in front of and above the conveying mechanism 31. When the casting pipe 100 moves along the conveying mechanism 31, the blowing pipe 32 performs a blowing treatment. Of course, it can also be as shown in FIG. Figure 4 As shown, the blowing pipes 32 are installed on both sides of the conveying mechanism 31 horizontally, and are selected according to specific production conditions.
[0034] like Figure 1As shown in the figure, the detection device 4 includes a conveying rack 41, supporting wheels 42 and a detection mechanism 43. The detection device 4 is mainly used to detect the quality of the cast pipe 100, so as to place the defective cast pipe 100 on the storage rack 5. The supporting wheels 42 are rotatably installed on the conveying rack 41, facilitating the turnover of the cast pipe 100 on the supporting wheels 42 for detection, making the detection of the cast pipe 100 more comprehensive without omission, ensuring the detection quality of the cast pipe 100. The detection mechanism 43 is preferably an image detection mechanism in this embodiment, taking pictures of the cast pipe 100 to collect production detection results, classifying the detection results, and giving an alarm prompt for the defective parts of the cast pipe 100. A special 2D image sensor is used to recheck and compare the defective parts, so as to detect and classify waste products, defects and qualified products. The defective cast pipe 100 is stored on the storage rack 5 and no longer undergoes subsequent annealing processes, reducing energy consumption and saving resources.
[0035] As Figure 1 shown in the figure, the storage rack 5 is mainly used to store the defective cast pipes 100. In this embodiment, the storage rack 5 can be a general storage rack or storage table, or it can also be placed on the ground. The main purpose is to distinguish the defective cast pipes 100 from the cast pipes 100 with good quality.
[0036] In this embodiment, a seal and a refractory are also installed on the heat exchanger. Specifically, after sealing the air leakage prone parts of the heat exchanger with a seal, a refractory such as a refractory lining is installed to ensure that there is no leakage of the combustion supporting air supplied to the combustion supporting fan 14. Due to the heat insulation effect of the refractory lining, the problem of welding and air leakage under the high temperature thermal effect at the air leakage part can be reduced.
[0037] In this embodiment, the burner 12 is also provided with an automatic ignition mechanism. Specifically, each burner 12 is equipped with an ignition electrode + UV, and the automatic ignition and automatic flame detection functions can be realized in cooperation with the BCU or ignition control later. The ignition automation is improved, and the safety is thus ensured. Specific Embodiment Two
[0039] In this embodiment, the parts identical to those in Embodiment One are given the same reference numerals and the same textual descriptions are omitted.
[0040] In this embodiment, the heating structure 16 can also be a gas heater, which directly burns gas to generate heat, and then heats the air through a heat exchanger to provide hot air for the combustion supporting fan. Then, it is sent into the combustion supporting fan 14 through the air supply pipeline 15. In other embodiments, the heating structure 16 can also be an electric heater, a heat pump, a solar heater, a steam heater, or an industrial furnace and boiler to heat the air, facilitating the combustion support of the burner 12, improving the flame intensity and combustion efficiency, and being selected according to the actual production situation.
[0041] Based on the above description of this specification, those skilled in the art can also understand the terms used as follows. For example, terms indicating orientation or positional relationships such as "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationships cannot be understood or interpreted as limitations on the solution of the present utility model.
[0042] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.
Claims
1. A water-cooled centrifugal ductile iron pipe annealing system, comprising an annealing device (1), characterized in that: The annealing device (1) comprises: an annealing furnace body (11) and a plurality of burners (12) arranged at intervals in the annealing furnace body (11); The burner (12) comprises a fuel port (121) and a flame-spraying port (122); the fuel port (121) is connected to a fuel pipeline (13); a combustion-supporting port 1 (123) is provided on one side of the fuel pipeline (13); the burner (12) further comprises a combustion-supporting port 2 (124) located between the fuel port (121) and the flame-spraying port (122); the combustion-supporting port 1 (123) and the combustion-supporting port 2 (124) are respectively connected to a combustion-supporting fan (14).
2. The water-cooled centrifugal ductile iron pipe annealing system according to claim 1, characterized in that: Each of the combustion-supporting fans (14) is connected to an air supply pipeline (15), and a heating structure (16) is provided on the air supply pipeline (15) to heat the air flowing through it.
3. The water-cooled centrifugal ductile iron pipe annealing system according to claim 2, characterized in that: The heating structure (16) is a heat exchanger, and the annealing device (1) is also provided with a waste heat blower (17) connected to the annealing furnace body (11), and the waste heat blower (17) is connected to the heat exchanger.
4. The water-cooled centrifugal ductile iron pipe annealing system according to any one of claims 1 to 3, characterized in that: The fuel pipeline (13) is provided with a valve (2), and the combustion-supporting port (123) is provided between the valve (2) and the fuel port (121).
5. The water-cooled centrifugal ductile iron pipe annealing system according to any one of claims 1 to 3, characterized in that: The water-cooled centrifugal ductile iron pipe annealing system comprises a sand blasting device (3) for blasting sand on the water-cooled centrifugal ductile iron pipe entering the annealing device (1). The sand blasting device (3) comprises a conveying mechanism (31) and a blowing pipe (32) on one side of the conveying mechanism (31).
6. The water-cooled centrifugal ductile iron pipe annealing system according to claim 5, characterized in that: There are several blowing pipes (32) which are respectively arranged on the upper part and / or the horizontal side part of the conveying mechanism (31).
7. The water-cooled centrifugal ductile iron pipe annealing system according to claim 6, characterized in that: A detection device (4) is also provided on a side of the sand blasting device (3) away from the annealing furnace body (11), and the detection device (4) comprises a conveying frame (41), a supporting wheel (42) rotatably mounted on the conveying frame (41), and a detection mechanism (43) located above the supporting wheel (42).