High-temperature flue gas backflow technology high-efficiency heat utilization device for industrial silicon furnace

Abstract

The utility model relates to a kind of industrial silicon furnace high-temperature flue gas backflow technology high-efficiency heat utilization device, including waste heat boiler, waste heat boiler is connected with the flue gas outlet of ore-heating furnace by pipeline, for recycling the heat in flue gas;Mixed reaction device, the air inlet of mixed reaction device is connected with the gas outlet of waste heat boiler by pipeline, for mixing and reacting the component in flue gas;Dust collector, the air inlet of dust collector is connected with the gas outlet of waste heat boiler by pipeline, for removing particulate matter in flue gas;Absorption tower, the air inlet of absorption tower is connected with the gas outlet of dust collector by pipeline, for removing sulfur oxide and nitrogen oxide in flue gas;Discharge pipeline, discharge pipeline is connected with the gas outlet of absorption tower, for flue gas after processing is discharged to atmosphere, the utility model is optimized flue gas treatment by adjusting oxygen content and back retention flue gas, effectively inhibit the emission of harmful gas such as nitrogen dioxide, while back retention flue gas utilizes waste heat, improve energy efficiency and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of heat utilization devices, specifically a high-efficiency heat utilization device using high-temperature flue gas recirculation technology for industrial silicon furnaces. Background Technology

[0002] In industrial production processes, especially in areas involving high-temperature equipment such as electric arc furnaces, flue gas treatment is a crucial step. Existing flue gas treatment systems typically include a series of devices such as waste heat boilers, dust collectors, and absorption towers. These devices are connected by pipelines to form the main flue gas treatment process. Waste heat boilers are used to recover and utilize heat from the flue gas, improving energy efficiency; dust collectors are used to remove particulate matter from the flue gas, reducing air pollution; and absorption towers are responsible for removing harmful substances such as sulfur oxides (SO2) and nitrogen oxides (NOx) from the flue gas. These devices each play their respective roles in flue gas treatment, working together to reduce the environmental pollution caused by flue gas.

[0003] However, existing flue gas treatment systems also have some drawbacks. First, during the operation of high-temperature equipment such as electric arc furnaces, large amounts of harmful gases such as nitrogen dioxide (NO2) are easily generated, and existing technologies have limited effectiveness in suppressing NO2 production. Second, although waste heat boilers can recover some heat, the overall waste heat utilization efficiency still needs to be improved. Furthermore, existing flue gas treatment systems require complex post-treatment devices to further process the flue gas, which not only increases costs but also enhances overall complexity.

[0004] Therefore, we propose a high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces. By automatically adjusting the oxygen content and recirculating the flue gas, the flue gas treatment is optimized. On the one hand, it effectively suppresses the production of harmful gases such as nitrogen dioxide (NO2) and reduces the emission of harmful gases. On the other hand, by recirculating part of the treated flue gas to the front end, the waste heat of the flue gas is fully utilized, which improves the energy utilization efficiency and reduces energy consumption. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and meet practical needs by providing a high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces. This addresses the issue that existing technologies have limited effectiveness in suppressing nitrogen dioxide production, as large amounts of harmful gases such as nitrogen dioxide (NO2) are easily generated during the operation of high-temperature equipment like submerged arc furnaces. Secondly, although waste heat boilers can recover some heat, the overall waste heat utilization efficiency still needs improvement. Furthermore, existing flue gas treatment methods require complex post-treatment devices to further process the flue gas, increasing both cost and overall technical complexity.

[0006] To achieve the objectives of this utility model, the technical solution adopted is as follows: A high-efficiency heat utilization device for high-temperature flue gas reflux technology in industrial silicon furnaces is designed, comprising...

[0007] Waste heat boiler, which is connected to the flue gas outlet of the electric arc furnace via a pipeline, is used to recover and utilize the heat in the flue gas.

[0008] A mixing and reaction device, wherein the air inlet of the mixing and reaction device is connected to the air outlet of the waste heat boiler via a pipe, and is used to mix and react the components in the flue gas;

[0009] A dust collector, the air inlet of which is connected to the air outlet of a waste heat boiler via a pipe, is used to remove particulate matter from flue gas;

[0010] An absorption tower, wherein the air inlet of the absorption tower is connected to the air outlet of the dust collector via a pipe, is used to remove sulfur oxides and nitrogen oxides from the flue gas;

[0011] An exhaust pipe, which is connected to the outlet of the absorption tower, is used to discharge the treated flue gas into the atmosphere.

[0012] Preferably, the outlet of the absorption tower is connected to one end of a flue gas return pipe, and the other end of the flue gas return pipe is connected to the inlet of the mixing reaction device.

[0013] Preferably, the waste heat boiler, mixing reaction device, dust collector, absorption tower and discharge pipeline are connected in sequence by pipelines.

[0014] Preferably, the flue gas return duct is equipped with a regulating valve to control the flow rate and pressure of the flue gas return, and the regulating valve is connected to the control component.

[0015] Preferably, the control component includes a sensor, a controller, and an actuator. The sensor is used to detect the furnace operating conditions and flue gas composition. The controller controls the actuator to operate according to the sensor signals, thereby controlling the furnace door, the oxygen supply channel of the furnace hood, the air supply channel of the furnace hood, and the regulating valve.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model optimizes flue gas treatment by automatically adjusting the oxygen content and recirculating the flue gas. First, by automatically adjusting the oxygen content, the production of nitrogen dioxide (NO2) is effectively suppressed, reducing the emission of harmful gases. Second, by recirculating part of the treated flue gas to the front end, the utilization efficiency of waste heat is improved, further reducing energy consumption.

[0018] In summary, the device proposed in this scheme has significant advantages in improving waste heat utilization, reducing total emissions, and eliminating nitrogen dioxide production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0020] In the diagram: 1. Waste heat boiler; 2. Mixing reaction device; 3. Dust collector; 4. Absorption tower; 5. Discharge pipeline; 6. Recirculating flue gas pipeline. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Example 1: A high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces, see [link / reference]. Figure 1 ,include

[0023] Waste heat boiler 1 is connected to the flue gas outlet of the electric arc furnace via a pipeline and is used to recover and utilize the heat in the flue gas.

[0024] The mixing reaction device 2 has its inlet connected to the outlet of the waste heat boiler 1 via a pipe, and is used to mix and react the components in the flue gas.

[0025] Dust collector 3, the air inlet of dust collector 3 is connected to the air outlet of waste heat boiler 1 through a pipe, and is used to remove particulate matter in flue gas;

[0026] Absorption tower 4, the air inlet of absorption tower 4 is connected to the air outlet of dust collector 3 through a pipe, and is used to remove sulfur oxides and nitrogen oxides from flue gas.

[0027] Discharge pipe 5 connects to the outlet of absorption tower 4 to discharge the treated flue gas into the atmosphere. The high-temperature flue gas from the electric arc furnace first enters waste heat boiler 1, where heat exchange recovers and utilizes the heat in the flue gas to preheat water or other media in the boiler, generating steam or hot water for production or domestic use, thereby improving energy efficiency. After initial cooling and heat recovery in waste heat boiler 1, the flue gas enters mixing reaction device 2 through a pipe. In this device, the flue gas is mixed with added chemical agents or air, undergoing a chemical reaction or physical mixing process to change the composition or properties of the flue gas, preparing it for subsequent treatment steps. The flue gas exiting mixing reaction device 2 enters dust collector 3 through waste heat boiler 1. The dust-removed flue gas then enters absorption tower 4, where it comes into full contact with the absorbent liquid, undergoing a chemical reaction to remove sulfur oxides (SO2) and nitrogen oxides (NOx) from the flue gas. xHarmful gases such as [unspecified gases] are treated in the absorption tower 4. Part of the treated flue gas is discharged into the atmosphere through the discharge pipe 5, while the other part is returned to the inlet of the mixing reactor 2 through the return flue gas pipe 6. The return flue gas pipe 6 is equipped with a regulating valve to control the flow rate and pressure of the returned flue gas. By adjusting the amount of returned flue gas, the reaction conditions within the mixing reactor 2 can be affected, thereby optimizing the flue gas treatment effect. Simultaneously, the waste heat carried by the returned flue gas can be recycled back into the waste heat boiler 1, further improving energy efficiency.

[0028] For details, see Figure 1 The outlet of the absorption tower 4 is connected to one end of the flue gas return pipe 6, and the other end of the flue gas return pipe 6 is connected to the inlet of the mixing reaction device 2.

[0029] Further, see Figure 1 The waste heat boiler 1, mixing reaction device 2, dust collector 3, absorption tower 4 and discharge pipe 5 are connected in sequence by pipes.

[0030] It is worth noting that, see Figure 1 A regulating valve is installed on the flue gas return pipe 6 to control the flow rate and pressure of the flue gas return, and the regulating valve is connected to the control component.

[0031] It is worth noting that, see Figure 1 The control components include sensors, controllers, and actuators. Sensors detect furnace conditions and flue gas composition. The controller, based on sensor signals, controls the actuators to operate, controlling the furnace door, oxygen supply channels, air supply channels, and regulating valves. The entire system operates automatically under the control of these components. The sensors monitor furnace conditions (such as temperature, pressure, and flue gas composition) and transmit the signals to the controller. The controller processes and analyzes the signals and then sends control commands to the actuators. Based on these commands, the actuators automatically adjust the furnace door, oxygen supply channels, air supply channels, and regulating valves, achieving automated operation and optimized control of the system.

[0032] When using a high-efficiency heat utilization device for high-temperature flue gas recirculation technology in an industrial silicon furnace, the high-temperature flue gas generated by the submerged arc furnace first enters the waste heat boiler 1. Through heat exchange, the heat in the flue gas is recovered and utilized to preheat water or other media in the boiler, generating steam or hot water for production or domestic use, thereby improving energy efficiency. After preliminary cooling and heat recovery in the waste heat boiler 1, the flue gas enters the mixing reaction device 2 through pipelines. In this device, the flue gas is mixed with added chemical agents or air, undergoing a chemical reaction or physical mixing process to change the composition or properties of the flue gas, preparing it for subsequent treatment steps. The flue gas exiting the mixing reaction device 2 enters the dust collector 3 through the waste heat boiler 1. The dust-removed flue gas then enters the absorption tower 4, where it comes into full contact with the absorbent liquid, undergoing a chemical reaction to remove sulfur oxides (SO2) and nitrogen oxides (NOx) from the flue gas. x Harmful gases such as oxygen and gas are treated by the absorption tower 4. Part of the treated flue gas is discharged into the atmosphere through the discharge pipe 5, while the other part is returned to the inlet of the mixing reactor 2 through the return flue gas pipe 6. The return flue gas pipe 6 is equipped with a regulating valve to control the flow rate and pressure of the returned flue gas. By adjusting the amount of returned flue gas, the reaction conditions within the mixing reactor 2 can be affected, thereby optimizing the flue gas treatment effect. Simultaneously, the waste heat carried by the returned flue gas can be recycled back into the waste heat boiler 1, further improving energy efficiency. The entire unit is automatically controlled by a control component, which includes sensors, a controller, and actuators. The sensors are used to detect the furnace operating conditions (such as temperature, pressure, and flue gas composition) and flue gas composition in real time, transmitting the detection signals to the controller. The controller processes and analyzes the detection signals and then sends control commands to the actuators. Based on the control commands, the actuators automatically adjust the furnace door, the oxygen supply channel of the furnace hood, the air supply channel of the furnace hood, and the regulating valves, achieving automated operation and optimized control of the unit.

[0033] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

Claims

1. A high-efficiency heat utilization device for high-temperature flue gas reflux technology in industrial silicon furnaces, characterized in that, include Waste heat boiler (1), which is connected to the flue gas outlet of the electric arc furnace through a pipeline, is used to recover and utilize the heat in the flue gas; A mixing reaction device (2) is provided, the inlet of which is connected to the outlet of a waste heat boiler (1) via a pipe, for mixing and reacting components in the flue gas. Dust collector (3), the air inlet of the dust collector (3) is connected to the air outlet of the waste heat boiler (1) through a pipe, and is used to remove particulate matter in the flue gas; Absorption tower (4), the air inlet of which is connected to the air outlet of dust collector (3) through a pipe, for removing sulfur oxides and nitrogen oxides from flue gas; The discharge pipe (5) is connected to the outlet of the absorption tower (4) and is used to discharge the treated flue gas into the atmosphere.

2. The high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces as described in claim 1, characterized in that, The outlet of the absorption tower (4) is connected to one end of a flue gas return pipe (6), and the other end of the flue gas return pipe (6) is connected to the inlet of the mixing reaction device (2).

3. The high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces as described in claim 1, characterized in that, The waste heat boiler (1), mixing reaction device (2), dust collector (3), absorption tower (4) and discharge pipe (5) are connected in sequence by pipes.

4. The high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces as described in claim 2, characterized in that, The surface of the flue gas return pipe (6) is provided with a regulating valve for controlling the flow rate and pressure of the flue gas return, and the regulating valve is connected to the control component.

5. The high-efficiency heat utilization device for high-temperature flue gas recirculation technology in industrial silicon furnaces as described in claim 4, characterized in that, The control components include sensors, controllers, and actuators. The sensors are used to detect the furnace operating conditions and flue gas composition. The controller controls the actuators to operate based on the sensor signals, thereby controlling the furnace door, the oxygen supply channel of the furnace hood, the air supply channel of the furnace hood, and the regulating valve.

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