Facility for baking alloy by using converter flue gas

Abstract

According to the facility for baking the alloy through the converter flue gas, through the adoption of the technical scheme, the consumption of coal gas is reduced, waste heat recycling in the slow cooling process is achieved, and the heat energy utilization efficiency is improved; the overall structure of equipment is simple, and the pipeline length is reduced; the device is installed at the fixed end of the movable smoke hood, and use of equipment is prevented from being affected. By the adoption of the technical scheme, consumption of coal gas is reduced, waste heat recycling in the slow cooling process is achieved, and the heat energy utilization efficiency is improved; the overall structure of equipment is simple, and the pipeline length is reduced; the device is installed at the fixed end of the movable smoke hood, and use of equipment is prevented from being affected.

Description

Technical Field

[0001] This invention belongs to the technical field of converter equipment in steel production. More specifically, this invention relates to a facility for baking alloys using converter flue gas. Background Technology

[0002] Currently, alloy baking in converter production mainly involves burning coal gas, blowing air through pipes to the alloy silo, and using high-temperature gas to heat the alloy, thus achieving alloy baking.

[0003] The equipment used in existing steelmaking technology heats air to over 700°C in the combustion chamber and then transports it to the alloy baking unit via pipelines. Due to equipment limitations, the required pipelines are often quite long, resulting in significant heat loss.

[0004] Using keywords such as "converter; flue gas; baking; alloy", a search was conducted on existing publicly available technical literature, yielding the following results:

[0005] 1. Chinese patent document: "Alloy Online Baking Device and Alloy Online Baking Feeding System", Patent (Application) No.: 201520680205.9; the technical solution described therein is:

[0006] "The online alloy baking device includes a hot air supply mechanism, an air supply mechanism, and a hopper mechanism. The hot air supply mechanism is located close to the converter. The hopper mechanism includes at least one alloy hopper, and hot air coils are arranged spirally within the conical section of each alloy hopper. Multiple air jet holes are provided on the hot air coils. The air supply mechanism is connected to the hot air supply mechanism and each hot air coil. Each alloy hopper is equipped with at least one flue gas exhaust pipe. An online alloy baking feeding system is also described, employing the online alloy baking loading and unloading method as described above."

[0007] The technical effects described are:

[0008] "It enables online baking of alloys, allowing them to be directly added to the ladle without any intermediate handling, thus minimizing heat loss."

[0009] 2. Chinese patent document: "A baking device for alloy materials in converter steelmaking", patent (application) number: 202120715903.3; the technical solution described therein is:

[0010] "The baking device for alloy materials in converter steelmaking includes a flue gas generating unit, a baking unit, and an alloy bin; the flue gas generating unit includes a flue gas generator, ignition burners, a gas pipeline, a pilot flame channel, a blower, and a blower branch pipe; the ignition burners are connected to the flue gas generator; one end of the gas pipeline is connected to a gas source, and the other end is connected to the ignition burner; the blower is connected to the ignition burner through the blower branch pipe; one end of the pilot flame channel is connected to a fire source, and the other end is connected to the ignition burner; the baking unit includes a heating flue gas pipe, a ring pipe, and radiant tube burners; one end of the heating flue gas pipe is connected to the flue gas generator, and the other end is connected to the ring pipe; several radiant tube burners are evenly arranged on the ring pipe; the radiant tube burners extend through the alloy bin wall into the alloy bin."

[0011] The technical effects described are:

[0012] The technical solution is characterized by its simple structure and high baking efficiency.

[0013] However, the technical solutions described in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "very long pipe length" and "serious heat loss". Summary of the Invention

[0014] This invention provides a facility for baking alloys using converter flue gas, the purpose of which is to recover and utilize the waste heat during the slow cooling process.

[0015] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0016] The present invention relates to a facility for baking alloys using converter flue gas, wherein the converter is equipped with a converter fume hood; a heat exchange plate is provided at a fixed end of the converter fume hood; the heat exchange plate is connected to an insulation pipe, and an alloy baking tank is provided at the other end of the insulation pipe.

[0017] A blower is installed on the insulated pipe.

[0018] The alloy baking tank is equipped with multiple temperature sensors; the temperature sensors are connected to the production control system.

[0019] The temperature of the flue gas entering the insulated duct is >500℃; the temperature of the baking gas after heat exchange in the alloy baking tank is >100℃.

[0020] The converter hood is located above the converter inlet.

[0021] An adjustable lip cover is also installed above the converter opening.

[0022] The alloy baking tank is connected to the high-temperature flue of the converter via a reflux flue gas pipe.

[0023] A return fan is installed on the return flue gas duct.

[0024] The blower is a centrifugal fan, and its drive motor is a temperature-controlled speed-regulating motor. The speed regulation method is as follows: when the converter flue gas temperature increases, the motor speed decreases; when the converter flue gas temperature decreases, the motor speed increases.

[0025] The insulated pipe is connected to the alloy baking tank, and multiple spray holes are provided at the connection point, which are evenly distributed in different positions of the alloy baking tank.

[0026] The present invention adopts the above-mentioned technical solution to reduce gas consumption, realize the recovery and utilization of waste heat in the slow cooling process, and improve the efficiency of heat energy utilization; the overall structure of the equipment is simple and the length of the pipeline is reduced; it is installed at the fixed end of the movable fume hood to avoid affecting the use of the equipment. Attached Figure Description

[0027] The following is a brief explanation of the contents shown in the attached figure and the markings therein:

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] The diagram is marked as follows:

[0030] 1. Converter hood, 2. Heat exchange plate, 3. Blower, 4. Insulated pipe, 5. Alloy baking tank, 6. Converter opening, 7. Movable lip cover, 8. Converter. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0032] like Figure 1 The structure shown in the present invention is a facility for baking alloys using converter flue gas, wherein the converter 8 is equipped with a converter fume hood 1.

[0033] To address the problems and overcome the shortcomings of existing technologies, and to achieve the objective of waste heat recovery and utilization in the slow cooling process, the technical solution adopted by this invention is as follows:

[0034] like Figure 1 As shown, the facility for baking alloys using converter flue gas of the present invention has a heat exchange plate 2 installed at the fixed end of the converter hood 1; the heat exchange plate 2 is connected to the heat insulation pipe 4, and an alloy baking tank 5 is installed at the other end of the heat insulation pipe 4.

[0035] In the diagram, the blower 3 and the alloy baking tank 5 only reflect the connection relationship of the structure, and are not represented according to the actual size scale.

[0036] This invention uses a flue gas duct (i.e., insulated duct 4) for heat exchange. The distance between the flue gas duct and the alloy baking silo (i.e., alloy baking tank 5) is short, making the design and construction simple. The heat loss during the heat recovery process is small, which improves the efficiency of heat energy utilization.

[0037] A blower 3 is installed on the insulated pipe 4. The blower 3 provides power for the transport of flue gas.

[0038] This invention utilizes the heat in the converter flue gas to exchange heat with air, and blows the high-temperature gas into the alloy baking tank 5 through the blower 4 for rapid heating; it avoids the risk of introducing gas combustion in the high-span area, and can achieve the purpose of saving gas consumption and recovering waste heat.

[0039] A heat exchange plate 2 is added to the fixed end of the converter hood. The heat exchange plate 2 is connected to the insulation pipe 4, and the blower 3 provides circulation power. During production, the heat exchange heat from the fixed end of the hood is continuously input into the alloy baking tank 5 to realize the design of using waste heat to replace the heat generated by coal gas combustion.

[0040] The alloy baking tank 5 is equipped with multiple temperature sensors; the temperature sensors are connected to the production control system.

[0041] The baking effect of the alloy is monitored by monitoring the temperature inside the alloy baking tank 5 using a temperature sensor.

[0042] The temperature of the flue gas entering the insulated pipe 4 is >500℃; the temperature of the baking gas after heat exchange in the alloy baking tank 5 is >100℃.

[0043] The above process can realize the recovery and utilization of waste heat in the slow cooling process. The overall structure of the equipment is simple and it is installed at the fixed end of the movable fume hood to avoid affecting the use of the equipment. At this time, the heat of the flue gas is still >500℃, and after heat exchange, it meets the process requirement of baking gas >100℃.

[0044] The converter hood 1 is located above the converter opening 6.

[0045] An movable lip cover 7 is also provided above the converter opening 6.

[0046] The alloy baking tank 5 is connected to the high-temperature flue of the converter via a return flue gas pipe. This allows for the recovery and reuse of the flue gas after heat exchange, improving the efficiency of thermal energy utilization.

[0047] A return fan is installed on the return flue gas duct. The return fan provides power for the recovery of flue gas.

[0048] The blower 3 is a centrifugal fan, and its drive motor is a temperature-controlled speed-regulating motor. The speed regulation method is as follows: when the converter flue gas temperature increases, the motor speed decreases; when the converter flue gas temperature decreases, the motor speed increases.

[0049] As the temperature of the flue gas inside the converter rises, it is necessary to reduce the heat transfer to the alloy baking tank 5. Therefore, it is required to reduce the speed of the centrifugal fan drive motor to reduce heat transfer; conversely, the heat transfer should be increased to ensure the heat supply to the alloy baking tank 5.

[0050] The part where the heat-insulating pipe 4 connects to the alloy baking tank 5 is provided with multiple spray holes, which are evenly distributed at different positions in the alloy baking tank 5.

[0051] The multiple nozzles ensure that the flue gas is evenly distributed within the alloy baking tank 5, thus guaranteeing the baking effect.

[0052] During the production process, infrared thermometers are used to inspect the temperature of various parts that require specific temperatures.

[0053] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A facility for baking alloys using converter flue gas, wherein the converter (8) is equipped with a converter fume hood (1), characterized in that: A heat exchange plate (2) is provided at the fixed end of the converter hood (1); the heat exchange plate (2) is connected to the insulation pipe (4), and an alloy baking tank (5) is provided at the other end of the insulation pipe (4).

2. The apparatus for baking alloys using converter flue gas according to claim 1, characterized in that: A blower (3) is installed on the insulated pipe (4).

3. The apparatus for baking alloys using converter flue gas according to claim 1, characterized in that: The alloy baking tank (5) is equipped with multiple temperature sensors; the temperature sensors are connected to the production control system.

4. The apparatus for baking alloys using converter flue gas according to claim 3, characterized in that: The temperature of the flue gas entering the insulated pipe (4) is >500℃; the temperature of the baking gas after heat exchange in the alloy baking tank (5) is >100℃.

5. The apparatus for baking alloys using converter flue gas according to claim 1, characterized in that: The converter hood (1) is located above the converter opening (6).

6. The apparatus for baking alloys using converter flue gas according to claim 5, characterized in that: An movable lip cover (7) is also provided above the converter opening (6).

7. The apparatus for baking alloys using converter flue gas according to claim 1, characterized in that: The alloy baking tank (5) is connected to the high-temperature flue of the converter through a return flue gas pipe.

8. The apparatus for baking alloys using converter flue gas according to claim 7, characterized in that: A return fan is installed on the return flue gas duct.

9. The apparatus for baking alloys using converter flue gas according to claim 2, characterized in that: The blower (3) is a centrifugal blower, and its drive motor is a temperature-controlled speed-regulating motor. The speed regulation control method is: when the converter flue gas temperature increases, the motor speed decreases; when the converter flue gas temperature decreases, the motor speed increases.

10. The apparatus for baking alloys using converter flue gas according to claim 1, characterized in that: Multiple spray holes are provided at the connection between the heat-insulating pipe (4) and the alloy baking tank (5), and are evenly distributed at different positions in the alloy baking tank (5).

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