Novel yellow phosphorus tail gas low-nitrogen combustion monitoring system
By designing a novel low-NOx combustion monitoring system for yellow phosphorus tail gas, the system utilizes a gas detector and controller to automatically adjust the combustion air volume, and combines a water seal module and a wire mesh demister to treat the tail gas. This solves the problem of excessive oxygen content in the combustion of yellow phosphorus tail gas, thereby improving combustion efficiency and reducing environmental costs.
Patent Information
- Application Number
- CN202423131850.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-18
AI Technical Summary
When the exhaust gas from the production of yellow phosphorus byproducts is burned in existing yellow phosphorus electric furnaces, the air distribution cannot be automatically adjusted, resulting in excessive oxygen content, excessive nitrogen oxides, and increased environmental treatment costs.
A novel low-NOx combustion monitoring system for yellow phosphorus tail gas is designed. The system monitors the composition of flue gas in real time using a gas detector, uses an external controller to control the regulating valve to adjust the intake air volume of the combustion air, and sets up a wire mesh demister in the water seal module for pretreatment to avoid impurities from clogging the gas and achieve self-controlled air mixing.
Effectively control combustion efficiency, reduce nitrogen oxide generation, lower environmental treatment pressure, ensure uniform combustion, and reduce environmental protection costs.
Smart Images
Figure CN223622927U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tail gas treatment of by-products in yellow phosphorus production, and in particular to a novel low-NOx combustion monitoring system for yellow phosphorus tail gas. Background Technology
[0002] Currently, most yellow phosphorus byproducts produced by yellow phosphorus electric furnaces use ordinary burners. These burners have a relatively simple design and cannot automatically adjust the air distribution based on the detection of the exhaust gas content after combustion. This leads to excessive air distribution, with the oxygen content in the tail gas generally exceeding 15%. Excessive air distribution also causes nitrogen in the air to react with nitrogen at high temperatures, producing nitrogen oxides. This puts significant pressure on downstream environmental protection facilities, increasing environmental treatment costs. Utility Model Content
[0003] This invention provides a novel low-NOx combustion monitoring system for yellow phosphorus exhaust gas, aiming to solve the environmental pressure caused by excessive oxygen content and excessive nitrogen oxides due to the inability to control the air distribution during exhaust gas combustion.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0005] A novel low-NOx combustion monitoring system for yellow phosphorus tail gas includes a combustion module. The tail gas inlet of the combustion module is connected to the tail gas source fan via a water seal module. The combustion-supporting gas inlet of the combustion module is connected to the combustion-supporting gas source fan via a regulating valve. The flue gas outlet of the combustion module is connected to the flue gas collection chamber via a flue gas duct. A gas detector is installed on the flue gas duct. The gas detector is electrically connected to the regulating valve via an external controller to form a linkage.
[0006] Preferably, the water seal module includes a water seal pipe, the inlet of which is connected to the exhaust gas source fan, and the outlet of which is connected to the exhaust gas inlet of the combustion module.
[0007] More preferably, a plurality of wire mesh demisters are provided at equal intervals along the axial direction inside the water seal pipe.
[0008] Furthermore, the outlet of the water seal pipe is connected to the exhaust gas inlet of the combustion module via an exhaust gas dewatering device.
[0009] Preferably, the combustion module includes a burner and a combustion chamber, with the burner's flame-emitting end connected to the combustion chamber, the exhaust gas inlet and the combustion-supporting gas inlet both located on the burner, and the flue gas outlet located on the combustion chamber.
[0010] Preferably, the flue gas duct is equipped with a one-way valve.
[0011] Preferably, the regulating valve is an electric flow regulating valve.
[0012] Preferably, the external controller is a PLC controller.
[0013] The beneficial effects of this utility model are:
[0014] 1. This system monitors the composition of the flue gas at the tail end of the flue gas duct in real time through a gas detector, and then controls the regulating valve to change the combustion air intake through an external controller, so as to achieve automatic control, ensure combustion efficiency, and reduce subsequent environmental protection pressure.
[0015] 2. The yellow phosphorus exhaust gas is pretreated by the water seal pipe of the water seal module and the wire mesh demister inside the water seal pipe to intercept impurities in the exhaust gas and prevent impurities such as phosphorus mud from clogging the burner and causing uneven mixing of exhaust gas and combustion air. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the system connection of this utility model;
[0017] In the diagram: 1. Water seal module; 11. Water seal pipe; 12. Wire mesh demister; 13. Exhaust gas dewatering device;
[0018] 2. Combustion module; 21. Burner; 22. Combustion chamber;
[0019] 3. Flue gas duct; 4. Gas detector; 5. External controller; 6. Regulating valve; 7. Check valve; 8. Flue gas collection chamber. Detailed Implementation
[0020] The embodiments will be further described below with reference to the accompanying drawings.
[0021] like Figure 1 As shown in the preferred embodiment 1, a novel low-NOx combustion monitoring system for yellow phosphorus tail gas includes a combustion module 2. The tail gas inlet of the combustion module 2 is connected to the tail gas source fan via a water seal module 1. The combustion-supporting gas inlet of the combustion module 2 is connected to the combustion-supporting gas source fan via a regulating valve 6. The flue gas outlet of the combustion module 2 is connected to the flue gas collection chamber 8 via a flue gas duct 3. A gas detector 4 is installed on the flue gas duct 3. The gas detector 4 is electrically connected to the regulating valve 6 via an external controller 5 to form a linkage. The gas detector 4 monitors the composition of the tail gas in the flue gas duct 3 in real time, thereby controlling the regulating valve 6 to change the combustion-supporting air intake volume through the external controller 5, realizing self-controlled mixing and multi-stage mixing, ensuring combustion efficiency, and reducing subsequent environmental pressure.
[0022] The combustion module 2 includes a burner 21 and a combustion chamber 22. The flame-emitting end of the burner 21 is connected to the combustion chamber 22 to ensure combustion. The exhaust gas inlet and the combustion-supporting gas inlet are both located on the burner 21 for introducing gas for combustion. The flue gas outlet is located on the combustion chamber 22 for discharging the gas after combustion.
[0023] The flue gas duct 3 is equipped with a one-way valve 7.
[0024] The regulating valve 6 is an electric flow regulating valve, ensuring the formation of automatic control.
[0025] The external controller 5 is a PLC controller, which ensures the formation of automatic control.
[0026] In a preferred embodiment 2, the water seal module 1 includes a water seal pipe 11, the inlet of which is connected to the exhaust gas source fan, and the outlet of which is connected to the exhaust gas inlet of the combustion module 2. This ensures that the exhaust gas passes through the water seal before entering the burner 21.
[0027] The water seal pipe 11 is provided with several wire mesh demisters 12 at equal intervals along the axial direction. These are used to remove impurities contained in the exhaust gas.
[0028] The outlet of the water seal pipe 11 is connected to the exhaust gas inlet of the combustion module 2 via the exhaust gas dewatering device 13. This is used to reduce the moisture content of the pretreated exhaust gas, facilitating combustion.
[0029] As a preferred embodiment 3, the wire mesh demister 12 has a mesh size of 20, and the oxygen content of the flue gas after combustion can be controlled within 3%, and the nitrogen oxides can be controlled within 200 mg / m³.
[0030] The working principle of this utility model:
[0031] The system monitors the composition of the tail flue gas in the flue gas duct 3 in real time through the gas detector 4, and then controls the regulating valve 6 through the external controller 5 to change the combustion air intake volume, so as to achieve automatic control, ensure combustion efficiency, reduce subsequent environmental protection pressure, and control the intake volume to reduce when the oxygen content exceeds the index, so as to ensure uniform air mixing and avoid excessive oxygen content in the flue gas.
[0032] The yellow phosphorus exhaust gas is pretreated by the water seal pipe 11 of the water seal module 1 and the wire mesh demister 12 inside the water seal pipe 11 to intercept impurities in the exhaust gas and prevent impurities such as phosphorus mud from clogging the burner 21, which would cause uneven mixing of exhaust gas and combustion air.
Claims
1. A novel low-NOx combustion monitoring system for yellow phosphorus tail gas, comprising a combustion module (2), characterized in that, The exhaust gas inlet of the combustion module (2) is connected to the exhaust gas source fan through the water seal module (1), the combustion-supporting gas inlet of the combustion module (2) is connected to the combustion-supporting gas source fan through the regulating valve (6), and the flue gas outlet of the combustion module (2) is connected to the flue gas collection chamber (8) through the flue gas pipe (3). A gas detector (4) is provided on the flue gas pipe (3), and the gas detector (4) is electrically connected to the regulating valve (6) through the external controller (5) to form a linkage.
2. The novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 1, characterized in that, The water seal module (1) includes a water seal pipe (11), the inlet of which is connected to the exhaust gas source fan, and the outlet of which is connected to the exhaust gas inlet of the combustion module (2).
3. The novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 2, characterized in that, The water seal pipe (11) is provided with several wire mesh demisters (12) at equal intervals along the axial direction.
4. The novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 3, characterized in that, The outlet of the water seal pipe (11) is connected to the exhaust gas inlet of the combustion module (2) through the exhaust gas dewatering device (13).
5. A novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 1, characterized in that, The combustion module (2) includes a burner (21) and a combustion chamber (22). The flame-emitting end of the burner (21) is connected to the combustion chamber (22). The exhaust gas inlet and the combustion gas inlet are both located on the burner (21), and the flue gas outlet is located on the combustion chamber (22).
6. The novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 1, characterized in that, The flue gas duct (3) is equipped with a one-way valve (7).
7. A novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 1, characterized in that, The regulating valve (6) is an electric flow regulating valve.
8. A novel low-NOx combustion monitoring system for yellow phosphorus tail gas according to claim 1, characterized in that, The external controller (5) is a PLC controller.