Double-chamber furnace burner gas energy-saving device

Abstract

The utility model relates to a double-chamber furnace burner gas energy-saving device which comprises a gas inlet pipeline, the gas inlet pipeline is provided with an air flow sensor and an air flow control valve, and a gas pipe is provided with a gas flow sensor and a gas flow control valve. The output end of the air flow sensor and the output end of the gas flow sensor are electrically connected with the input end of the controller, and the output end of the controller is connected with the air flow control valve and the gas flow control valve. The controller is provided with a master controller, the master controller is provided with a double-cross control module, and the master controller controls the air flow control valve and the gas flow control valve through the double-cross control module and the controller. The controller and the master controller are arranged, the controller transmits detection parameters of the air flow sensor and the gas flow sensor to the master controller, the master controller achieves double-cross control through the double-cross control module, and the controller adjusts the valve opening degree of the air flow control valve and the valve opening degree of the gas flow control valve through the double-cross control. And thus, energy-saving control is realized.

Description

Technical Field

[0001] The utility model belongs to the field of aluminum processing melting and casting, and particularly relates to a gas-saving device for a double-chamber furnace burner. Background Art

[0002] The heating medium of the double-chamber furnace is natural gas, and the combustion-supporting air enters the furnace through the intake pipe after being heated by the regenerator. The double-chamber furnace is provided with 2 heating devices, which are distributed on the same side to heat and melt the raw materials. The existing combustion control mode is to set the temperature, select a single heating device, two heating devices or two heating devices to work alternately, and the control method is pulse control. When the furnace temperature is consistent with the set temperature, the heating device stops working. This control is relatively rough. When initially debugging and setting, the heating capacity and output of the furnace need to be considered, and the heating load is at a relatively high level, which will cause waste of heat energy. At the same time, when the calorific value of the gas, the pressure, the pressure of the combustion-supporting air, and the furnace condition change, the combustion system will be greatly affected. For example, the oxygen content in the flue gas is about 19% or so, the flue temperature is high, the oxidation loss is large, the nitrogen oxides are high, and the thermal efficiency is low. When the production rhythm changes, there is no better control strategy for the furnace temperature, which will also cause relatively large waste.

[0003] Therefore, there is an urgent need for a burner gas-saving device to achieve energy-saving control while ensuring the smooth progress of aluminum processing melting and casting operations. Summary of the Invention

[0004] In order to solve the problem of high energy consumption of the existing double-chamber furnace heating control device, the utility model provides a gas-saving device for a double-chamber furnace burner, which is provided with a controller and a master controller. The controller transmits the detection parameters of the air flow sensor and the gas flow sensor to the master controller, and the master controller realizes double-cross control through a double-cross control module. The controller adjusts the valve openings of the air flow control valve and the gas flow control valve through double-cross control, thereby realizing energy-saving control.

[0005] In order to achieve the above purpose, the utility model provides a gas-saving device for a double-chamber furnace burner, which includes a furnace, two heating devices, an intake pipe and an exhaust pipe. The intake pipe and the exhaust pipe are both communicated with the furnace. The intake pipe is provided with an induced draft fan, and the exhaust pipe is provided with an exhaust fan. The induced draft fan and the exhaust fan are connected with a controller. Both of the two heating devices include a gas pipe and a burner. The intake pipe is provided with an air flow sensor and an air flow control valve, and the gas pipe is provided with a gas flow sensor and a gas flow control valve;

[0006] The output ends of the air flow sensor and the gas flow sensor are electrically connected to the input end of the controller, and the output end of the controller is connected to the air flow control valve and the gas flow control valve;

[0007] The controller is provided with a master controller, and the master controller is provided with a dual cross control module. The master controller controls an air flow control valve and a gas flow control valve through the dual cross control module and the controller.

[0008] Further, the master controller includes a first PLC controller and a host computer, and the controller includes a second PLC controller. The second PLC controller is communicatively connected to the first PLC controller.

[0009] A first PLC controller and a second PLC controller are provided, the original control device is retained, and the first PLC controller is set to complete dual cross control to optimize the combustion operation.

[0010] Further, the dual cross control module includes a high selector A, a high selector B, a low selector A and a low selector B, a positive biaser A and a positive biaser B, and a negative biaser A and a negative biaser B.

[0011] The output end of the first PLC controller is connected to the air flow control valve through the low selector B, the high selector B and the second PLC controller, and the input end of the first PLC controller is connected to the gas flow sensor through the positive biaser B, the negative biaser A and the second PLC controller;

[0012] The output end of the first PLC controller is connected to the gas flow control valve through the high selector A, the low selector A and the second PLC controller, and the input end of the first PLC controller is connected to the air flow sensor through the negative biaser B, the positive biaser A and the second PLC controller.

[0013] Through the dual cross control module, the gas flow control valve and the air flow control valve are dynamically adjusted to achieve the purposes of improving production efficiency, reducing energy consumption, and reducing oxidation loss.

[0014] Further, the furnace is provided with an oxygen content detection sensor, a first temperature sensor and a pressure sensor, and the output ends of the oxygen content detection sensor, the first temperature sensor and the pressure sensor are connected to the input end of the second PLC controller.

[0015] Further, the burner is provided with a second temperature sensor, and the output end of the second temperature sensor is connected to the input end of the second PLC controller.

[0016] An oxygen content detection sensor is provided to detect the oxygen content in the furnace, and a second temperature sensor is provided to detect the temperature at the burner, providing a hardware basis for realizing air-fuel ratio correction.

[0017] Further, the exhaust pipe is provided with a flue gas regulating valve, and the flue gas regulating valve is electrically connected to the second PLC controller.

[0018] Adjust the flue damper to control the furnace pressure. Ensure that the furnace pressure is slightly positive during normal production to reduce the intake of cold air and the overflow of a large amount of hot gas.

[0019] Further, a frequency converter is provided between the induced draft fan and the exhaust fan and the second PLC controller. The frequency converter is electrically connected to the second PLC controller. The induced draft fan and the exhaust fan are connected to the power supply through the frequency converter to form a circuit.

[0020] Adjust the working power of the frequency converter through the frequency converter to achieve an energy-saving effect.

[0021] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0022] The present utility model can make full use of fuel and maximize the thermal efficiency. First, an air flow sensor and an air flow control valve are provided in the intake pipeline, a gas flow sensor and a gas flow control valve are provided in the gas pipeline, and a controller and a master controller are provided. The controller receives the detection parameters of the air flow sensor and the gas flow sensor. The master controller sends a control signal to the controller through the dual cross control module to adjust the air flow control valve and the gas flow control valve. The air-fuel ratio is corrected by the second temperature sensor and the oxygen content detection sensor to make the oxygen content in the furnace slightly positive oxygen, ensuring that the double-chamber furnace is in the best combustion working state, which can effectively reduce nitrogen oxides, reduce the emission of flue gas particulate matter, and reduce oxidation and burning loss. Ensure that the double-chamber furnace is in the best combustion working state, which can effectively reduce nitrogen oxides, reduce the emission of flue gas particulate matter, and reduce oxidation and burning loss. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a double-chamber furnace burner gas energy-saving device of the present utility model;

[0024] Figure 2 It is one of the circuit diagrams of a double-chamber furnace burner gas energy-saving device of the present utility model;

[0025] Figure 3 It is another circuit diagram of a double-chamber furnace burner gas energy-saving device of the present utility model;

[0026] Figure 4 It is a functional schematic diagram of a double-chamber furnace burner gas energy-saving device of the present utility model.

[0027] Attached drawing reference numerals: 1 is the furnace chamber, 2 is the intake pipe, 3 is the exhaust pipe, 4 is the induced draft fan, 5 is the exhaust fan, 6 is the burner, 7 is the air flow sensor, 8 is the air flow control valve, 9 is the gas flow sensor, 10 is the gas flow control valve, 11 is the dual cross control module, 12 is the first PLC controller, 13 is the second PLC controller, 14 is the oxygen content detection sensor, 15 is the first temperature sensor, 16 is the pressure sensor, 17 is the second temperature sensor, 18 is the flue gas regulating valve. Detailed implementation manner

[0028] The present utility model will be further described below in conjunction with the attached drawings and the detailed implementation manner:

[0029] Embodiment 1

[0030] As Figures 1 to 4 shown, a gas energy-saving device for a double-chamber furnace burner includes a furnace chamber 1, two heating devices, an intake pipe 2 and an exhaust pipe 3. The intake pipe 2 and the exhaust pipe 3 are both communicated with the furnace chamber 1. The intake pipe 2 is provided with an induced draft fan 4, and the exhaust pipe 3 is provided with an exhaust fan 5. The induced draft fan 4 and the exhaust fan 5 are connected to a controller. Both of the two heating devices include a gas pipe and a burner 6. The intake pipe 2 is provided with an air flow sensor 7 and an air flow control valve 8, and the gas pipe is provided with a gas flow sensor 9 and a gas flow control valve 10;

[0031] The output ends of the air flow sensor 7 and the gas flow sensor 9 are electrically connected to the input end of the controller, and the output end of the controller is connected to the air flow control valve 8 and the gas flow control valve 10;

[0032] The controller is provided with a master controller. The master controller is provided with a dual cross control module 11. The master controller controls the air flow control valve 8 and the gas flow control valve 10 through the dual cross control module 11 and the controller.

[0033] The master controller includes a first PLC controller 12 and a host computer, and the controller includes a second PLC controller 13. The second PLC controller 13 is communicatively connected to the first PLC controller 12.

[0034] The dual cross control module 11 includes a high selector A, a high selector B, a low selector A and a low selector B, a positive biaser A and a positive biaser B, a negative biaser A and a negative biaser B;

[0035] The output end of the first PLC controller 12 is connected to the air flow control valve 8 through the low selector B, the high selector B and the second PLC controller 13, and the input end of the first PLC controller 12 is connected to the gas flow sensor 9 through the positive biaser B, the negative biaser A and the second PLC controller 13;

[0036] The output end of the first PLC controller 12 is connected to the gas flow control valve 10 through a high selector A, a low selector A and a second PLC controller 13, and the input end of the first PLC controller 12 is connected to the air flow sensor 7 through a negative biaser B, a positive biaser A and a second PLC controller 13.

[0037] The high selector, the low selector, the positive biaser and the negative biaser are composed of amplifiers.

[0038] The furnace 1 is provided with an oxygen content detection sensor 14, a first temperature sensor 15 and a pressure sensor 16, and the output ends of the oxygen content detection sensor 14, the first temperature sensor 15 and the pressure sensor 16 are connected to the input end of the second PLC controller 13.

[0039] The burner 6 is provided with a second temperature sensor 17, and the output end of the second temperature sensor 17 is connected to the input end of the second PLC controller 13.

[0040] The exhaust pipe 3 is provided with a flue damper 18, and the flue damper 18 is electrically connected to the second PLC controller 13.

[0041] An inverter is arranged between the induced draft fan 4 and the exhaust fan 5 and the second PLC controller 13, the inverter is electrically connected to the second PLC controller 13, and the induced draft fan 4 and the exhaust fan 5 are connected to the power supply through the inverter to form a loop.

[0042] The lower limit value E of the fuel flow is determined by the detection value F2 of the air flow sensor 7 and the negative biaser B, the upper limit value F of the fuel flow is determined by the air flow measurement value F2 and the positive biaser A, the upper limit value G of the air flow (converted to coal gas equivalent) is determined by the detection value F1 of the gas flow sensor 9 and the positive biaser B, and the lower limit value H of the air flow (converted to coal gas equivalent) is determined by the measurement value F1 of the fuel flow and the negative biaser A.

[0043] In the steady state, E≤Z≤F and H≤Z≤G, and both the fuel flow and the air flow are directly given by Z.

[0044] When the furnace load drops sharply, Z drops. After the Z signal is compared with E, the larger value is taken by the high selector B to obtain E. After the E signal is compared with F, the smaller value is taken by the low selector B to obtain E. The lower limit value E of the fuel flow is used as the fuel flow set value.

[0045] At the same time, after the Z is compared with the signal G, the smaller value is taken by the low selector A to obtain Z. After the Z signal is compared with the H signal, the larger signal H is taken by the high selector A. The lower limit value H of the air flow (converted to coal gas equivalent) is used as the air flow set value.

[0046] By adjusting the air flow control valve 8 and the gas flow control valve 10, the fuel quantity is reduced first, and the air flow is also reduced without black smoke.

[0047] When the furnace load rises sharply, the Z signal increases. After comparing the Z signal with the signal G, the smaller value is taken by the low selector A, and G is selected. After comparing the signal G with H, the larger value is taken by the high selector A, and G is selected. The upper limit value G of the air flow (converted to the equivalent of coal gas) is used as the air flow set value, so that the air flow increases first, but does not exceed the upper limit value.

[0048] At the same time, after comparing the Z signal with E, the larger signal Z is selected by the high selector B. Then, after comparing Z with F, the smaller value is taken by the low selector B, and F is selected. The upper limit value F of the fuel flow is used as the set value of the coal gas flow.

[0049] By adjusting the air flow control valve 8 and the gas flow control valve 10.

[0050] During this period, the air-fuel ratio is corrected by the detected value of the second temperature sensor 17, that is, the heat of the burner 6, and the detected value of the oxygen content detection sensor 14, that is, the oxygen content in the furnace 1, preventing the phenomenon of excessive fuel supply and black smoke. Further, the energy-saving effect is achieved.

[0051] In addition, the pressure sensor 16 and the first temperature sensor 15 detect the temperature and pressure in the furnace 1. By adjusting the valve opening size of the flue gas regulating valve 18, a slightly positive pressure is maintained in the furnace 1, reducing the inhalation of cold air and the overflow of a large amount of hot gas, thereby achieving an energy-saving effect.

[0052] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent shall be included in the scope of the present invention's patent application.

Claims

1. A gas energy-saving device for a double-chamber furnace burner, comprising a furnace chamber (1), two heating devices, an intake pipeline (2) and an exhaust pipeline (3), wherein the intake pipeline (2) and the exhaust pipeline (3) are both communicated with the furnace chamber (1), an induced draft fan (4) is arranged on the intake pipeline (2), an exhaust fan (5) is arranged on the exhaust pipeline (3), the induced draft fan (4) and the exhaust fan (5) are connected to a controller, and both of the two heating devices include a gas pipeline and a burner (6), and it is characterized in that, The intake duct (2) is provided with an air flow sensor (7) and an air flow control valve (8), and the gas pipe is provided with a gas flow sensor (9) and a gas flow control valve (10); The output ends of the air flow sensor (7) and the gas flow sensor (9) are electrically connected to the input end of the controller, and the output end of the controller is connected to the air flow control valve (8) and the gas flow control valve (10); The controller is provided with a master controller, the master controller is provided with a dual cross control module (11), and the master controller controls the air flow control valve (8) and the gas flow control valve (10) through the dual cross control module (11) and the controller.

2. The gas energy-saving device for a double-chamber furnace burner according to claim 1, characterized in that The master controller includes a first PLC controller (12) and a host computer, the controller includes a second PLC controller (13), and the second PLC controller (13) is communicatively connected to the first PLC controller (12).

3. The gas energy-saving device for a double-chamber furnace burner according to claim 2, characterized in that, The dual cross control module (11) includes a high selector A, a high selector B, a low selector A and a low selector B, a positive biaser A and a positive biaser B, a negative biaser A and a negative biaser B; The output end of the first PLC controller (12) is connected to the air flow control valve (8) through the low selector B, the high selector B and the second PLC controller (13), and the input end of the first PLC controller (12) is connected to the gas flow sensor (9) through the positive biaser B, the negative biaser A and the second PLC controller (13); The output end of the first PLC controller (12) is connected to the gas flow control valve (10) through the high selector A, the low selector A and the second PLC controller (13), and the input end of the first PLC controller (12) is connected to the air flow sensor (7) through the negative biaser B, the positive biaser A and the second PLC controller (13).

4. A double-chamber furnace burner gas energy-saving device according to claim 2, characterized in that, The furnace (1) is provided with an oxygen content detection sensor (14), a first temperature sensor (15) and a pressure sensor (16), and the output ends of the oxygen content detection sensor (14), the first temperature sensor (15) and the pressure sensor (16) are connected to the input end of the second PLC controller (13).

5. The gas energy-saving device for a double-chamber furnace burner according to claim 2, characterized in that, The burner (6) is provided with a second temperature sensor (17), and the output end of the second temperature sensor (17) is connected to the input end of the second PLC controller (13).

6. The gas energy-saving device for a double-chamber furnace burner according to claim 2, wherein, The exhaust duct (3) is provided with a flue damper (18), and the flue damper (18) is electrically connected to the second PLC controller (13).

7. The gas energy-saving device for a double-chamber furnace burner according to claim 2, wherein An inverter is provided between the induced draft fan (4) and the exhaust fan (5) and the second PLC controller (13), the inverter is electrically connected to the second PLC controller (13), and the induced draft fan (4) and the exhaust fan (5) are connected to the power supply through the inverter to form a loop.

Images