Smoke exhaust frame based on oxygen content online detection feedback automatic adjustment

Abstract

The utility model discloses a smoke exhaust frame based on oxygen content online detection feedback automatic adjustment. The smoke exhaust frame comprises a smoke exhaust frame main pipeline and a plurality of smoke exhaust frame branch pipes communicated with the smoke exhaust frame main pipeline. Each smoke exhaust support branch pipe is provided with an oxygen content measuring instrument for measuring the oxygen content in the smoke exhaust support branch pipe; each smoke exhaust support branch pipe is provided with an adjusting valve used for adjusting the opening degree of the smoke exhaust support branch pipe. According to oxygen content feedback measured by the oxygen content measuring instrument installed at the smoke exhaust frame branch pipe, the smoke exhaust frame automatically adjusts the air suction amount and reduces heat loss in combination with the temperature of the flame path, and therefore fuel gas consumption is reduced, the oxygen content of smoke is reduced, and the nitrogen oxide content is reduced.

Description

Technical Field

[0001] This utility model relates to the field of aluminum anode baking technology, and in particular to a smoke exhaust rack that automatically adjusts based on online oxygen content detection feedback. Background Technology

[0002] The aluminum anode baking process involves injecting natural gas into the fire channel, where it burns and the heat generated is transferred to the green billet through the furnace walls and filler. During the heating process, due to the negative pressure, the volatiles that overflow from the green billet during baking are drawn into the fire channel to continue burning, providing the heat required for baking. At the same time, the air preheated in the cooling stage is drawn into the fire channel to provide the oxygen required for combustion.

[0003] Currently, exhaust fans can only be adjusted based on the flue temperature, failing to effectively ensure optimal combustion of the natural gas and air mixture. This results in the intake of excessive cold air, causing heat loss, increased natural gas consumption, and increased nitrogen oxides. Simultaneously, the unburned oxygen increases the oxygen content of the flue gas, creating difficulties in subsequent environmental emission calculations.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a smoke exhaust rack that automatically adjusts based on online oxygen content detection feedback. Utility Model Content

[0005] The purpose of this invention is to provide a smoke exhaust rack that automatically adjusts based on online oxygen content detection feedback. This smoke exhaust rack automatically adjusts the air intake based on the oxygen content measured by an oxygen content meter installed at the branch pipe of the smoke exhaust rack, combined with the fire duct temperature, to reduce heat loss, thereby reducing gas consumption, lowering the oxygen content in the flue gas, and lowering the nitrogen oxide content.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a smoke exhaust rack based on online oxygen content detection feedback for automatic adjustment. The smoke exhaust rack includes:

[0008] The main exhaust pipe of the smoke exhaust rack; and

[0009] Multiple branch pipes of the smoke exhaust frame connected to the main exhaust frame pipeline;

[0010] Each of the aforementioned exhaust frame branch pipes is equipped with an oxygen content measuring instrument for measuring the oxygen content inside the exhaust frame branch pipe;

[0011] Each of the aforementioned exhaust rack branch pipes is equipped with an adjusting valve for adjusting the opening of the exhaust rack branch pipe.

[0012] Furthermore, the main exhaust pipe has a front end located upstream of the process and an end end located downstream of the process;

[0013] Multiple thermometers are installed at intervals on the main exhaust pipe of the smoke exhaust rack, and the multiple thermometers are used to detect the temperature at corresponding positions on the main exhaust pipe of the smoke exhaust rack.

[0014] Furthermore, the branch pipe of the smoke exhaust frame is connected to the lower part of the main pipe of the smoke exhaust frame;

[0015] The lower end of the exhaust frame branch pipe is connected to a detection pipe. The detection pipe is connected to the exhaust frame branch pipe through a flange, and a regulating valve connected to the flange is installed between the exhaust frame branch pipe and the flange of the detection pipe.

[0016] The lower end of the detection tube is connected to a flexible tube via a flange.

[0017] Furthermore, the oxygen content analyzer is mounted on the detection tube.

[0018] Furthermore, the thermometers are all arranged on the corresponding exhaust rack branch pipe near the downstream section of the exhaust rack branch pipe.

[0019] Furthermore, the number of thermometers is the same as the number of exhaust rack branch pipes;

[0020] The thermometer is installed in the space between two adjacent exhaust rack branch pipes, and the thermometer is close to one of the exhaust rack branch pipes at the upstream end of the process.

[0021] One of the thermometers at the process end is installed at the end of the main pipeline of the exhaust rack.

[0022] Furthermore, both the oxygen content analyzer and the regulating valve are connected to an external PLC controller.

[0023] In the above technical solution, the smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment provided by this utility model has the following beneficial effects:

[0024] The exhaust frame of this invention automatically adjusts the air intake based on the oxygen content measured by an oxygen content measuring instrument installed at the branch pipe of the exhaust frame, combined with the fire duct temperature, to reduce heat loss, thereby reducing gas consumption, lowering the oxygen content in the flue gas, and lowering the nitrogen oxide content. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1This is a schematic diagram of a smoke exhaust rack that automatically adjusts based on online oxygen content detection feedback, as disclosed in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Main flue gas exhaust system; 3. Regulating valve; 4. Oxygen content analyzer; 5. Thermometer;

[0029] 201. Smoke exhaust rack branch pipe; 202. Measuring pipe; 203. Flexible hose. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0031] See Figure 1 As shown;

[0032] This embodiment discloses a smoke exhaust rack that automatically adjusts based on online oxygen content detection feedback. The smoke exhaust rack includes:

[0033] Exhaust rack main line 1; and

[0034] Multiple branch pipes 201 of the smoke exhaust rack connected to the main exhaust rack road 1;

[0035] Each smoke exhaust rack branch pipe 201 is equipped with an oxygen content measuring instrument 4 for measuring the oxygen content inside the smoke exhaust rack branch pipe 201.

[0036] Each exhaust rack branch pipe 201 is equipped with a regulating valve 3 for adjusting the opening of the exhaust rack branch pipe 201.

[0037] Specifically, this embodiment discloses a smoke exhaust rack with automatic adjustment based on online oxygen content detection feedback, which includes a main smoke exhaust rack pipeline 1 and multiple smoke exhaust rack branch pipes 201. In this embodiment, a regulating valve 3 is provided on each smoke exhaust rack branch pipe 201, and an oxygen content measuring instrument 4 is installed at a designated position on each smoke exhaust rack branch pipe 201. The oxygen content measuring instrument 4 is used to measure the oxygen content in each smoke exhaust rack branch pipe 201, and based on the communication between the PLC controller, the regulating valve 3, and the oxygen content measuring instrument 4, the PLC controller controls the regulating valve according to the measured value to adjust the opening degree of the regulating valve 3 of each smoke exhaust rack branch pipe 201, thereby realizing the regulation of oxygen content.

[0038] Preferably, in this embodiment, the main exhaust pipe 1 has a front end located at the upstream end of the process and an end end located at the downstream end of the process;

[0039] Multiple thermometers 5 are installed at intervals on the main exhaust pipe 1 of the smoke exhaust rack, and the multiple thermometers 5 are used to detect the temperature at corresponding positions on the main exhaust pipe 1 of the smoke exhaust rack.

[0040] In this embodiment, multiple thermometers 5 are spaced apart on the main flue gas exhaust pipe 1 to monitor the temperature at each monitoring point on the main flue gas exhaust pipe 1 in real time. This achieves the purpose of controlling the amount of cold air drawn in, reducing the heat loss of natural gas, and lowering the oxygen and nitrogen oxide content in the flue gas. Specifically, the multiple thermometers 5 need to be arranged sequentially along the main flue gas exhaust pipe 1 according to the process flow, specifically at the downstream end of each flue gas exhaust pipe branch pipe 201.

[0041] Preferably, in this embodiment, the smoke exhaust rack branch pipe 201 is connected to the lower part of the smoke exhaust rack main pipe 1;

[0042] The lower end of the exhaust rack branch pipe 201 is connected to a detection pipe 202. The detection pipe 202 is connected to the exhaust rack branch pipe 201 through a flange, and a regulating valve 3 connected to the flange is installed between the exhaust rack branch pipe 201 and the flange of the detection pipe 202. The lower end of the detection pipe 202 is connected to a flexible hose 203 through a flange.

[0043] First, this embodiment further defines the structure of the exhaust rack branch pipe 201 and its connecting pipes. From the main exhaust rack pipeline 1 near the end to the far end, the exhaust rack branch pipe 201 in this embodiment is sequentially connected to the detection pipe 202 and the flexible hose 203. The exhaust rack branch pipe 201 in this embodiment is connected to the detection pipe 202 through a flange. The regulating valve 3 in this embodiment is integrated by means of a flange or by directly installing the gate of the regulating valve 3 between the two pipes. The opening degree of the regulating valve 3 controlled by the PLC controller is the opening degree of the regulating gate, thereby controlling the airflow and thus regulating the oxygen content and the cold air content.

[0044] Based on the structure of the exhaust frame branch pipe 201 described above, the oxygen content analyzer 4 in this embodiment is installed on the detection pipe 202.

[0045] Preferably, in this embodiment, the thermometers 5 are all arranged at the downstream section of the corresponding exhaust rack branch pipe 201, close to the process downstream section of the exhaust rack branch pipe 201.

[0046] Specifically, in this embodiment, the number of thermometers 5 is the same as the number of exhaust rack branch pipes 201; wherein, in this embodiment, the thermometers 5 are installed in the space between two adjacent exhaust rack branch pipes 201, and the thermometers 5 are close to one exhaust rack branch pipe 201 at the upstream end of the process.

[0047] A thermometer 5 is installed at the end of the process end of the main exhaust pipe 1 of the smoke exhaust rack.

[0048] Preferably, in this embodiment, both the oxygen content analyzer 4 and the regulating valve 3 are connected to an external PLC controller.

[0049] When measuring oxygen content, if the oxygen content meter 4 detects an oxygen content below 15%, it sends a signal to the PLC controller. The PLC controller then controls the corresponding regulating valve 3 to gradually open the branch pipe valve (note: the valve opening can also be manually adjusted) to control the oxygen content at 15% ± 1%. Conversely, based on the temperature reading from the thermometer 5, if the temperature exceeds the target temperature by 30°C, the opening of the regulating valve 3 on the exhaust fan branch pipe 201 needs to be gradually closed to keep the temperature difference within the set range. Therefore, during operation, the thermometer 5 also needs to communicate with the PLC controller to transmit the detected temperature value and utilize the control program within the PLC controller to adjust and control the regulating valve 3.

[0050] In the above technical solution, the smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment provided by this utility model has the following beneficial effects:

[0051] The exhaust frame of this utility model automatically adjusts the air intake based on the oxygen content measured by the oxygen content measuring instrument 4 installed at the branch pipe 201 of the exhaust frame, combined with the fire duct temperature, to reduce heat loss, thereby reducing gas consumption, lowering the oxygen content of the flue gas, and lowering the nitrogen oxide content.

[0052] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A smoke exhaust rack with automatic adjustment based on online oxygen content detection feedback, characterized in that, The exhaust fan includes: The main exhaust pipe (1); and Multiple exhaust rack branch pipes (201) connected to the main exhaust rack pipeline (1); Each of the aforementioned exhaust rack branch pipes (201) is equipped with an oxygen content measuring instrument (4) for measuring the oxygen content inside the exhaust rack branch pipe (201); Each of the aforementioned exhaust rack branch pipes (201) is equipped with a regulating valve (3) for adjusting the opening of the exhaust rack branch pipe (201).

2. The smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment according to claim 1, characterized in that, The main exhaust pipe (1) has a front end located at the upstream end of the process and an end end located at the downstream end of the process; Multiple thermometers (5) are installed at intervals on the main exhaust pipe (1) of the smoke exhaust rack, and the multiple thermometers (5) are used to detect the temperature at corresponding positions of the main exhaust pipe (1).

3. A smoke exhaust rack based on online oxygen content detection and feedback for automatic adjustment as described in claim 2, characterized in that, The smoke exhaust rack branch pipe (201) is connected to the lower part of the smoke exhaust rack main pipeline (1); The lower end of the exhaust rack branch pipe (201) is connected to a detection pipe (202). The detection pipe (202) is connected to the exhaust rack branch pipe (201) through a flange. A regulating valve (3) connected to the flange is installed between the flange of the exhaust rack branch pipe (201) and the flange of the detection pipe (202). The lower end of the detection tube (202) is connected to a flexible tube (203) via a flange.

4. A smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment according to claim 3, characterized in that, The oxygen content analyzer (4) is installed on the detection tube (202).

5. A smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment according to any one of claims 2 to 4, characterized in that, The thermometers (5) are all arranged in the downstream section of the corresponding exhaust rack branch pipe (201) near the process of the exhaust rack branch pipe (201).

6. A smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment according to claim 5, characterized in that, The number of thermometers (5) is the same as the number of exhaust rack branch pipes (201); The thermometer (5) is installed in the space between two adjacent exhaust rack branch pipes (201), and the thermometer (5) is close to one of the exhaust rack branch pipes (201) at the upstream end of the process. A thermometer (5) at the process end is installed at the end of the main exhaust pipe (1) of the smoke rack.

7. A smoke exhaust rack based on online oxygen content detection and feedback automatic adjustment according to any one of claims 2 to 4, characterized in that, Both the oxygen content measuring instrument (4) and the regulating valve (3) are connected to an external PLC controller.

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