Gas recirculation device in oxygen-enriched combustion furnace

Abstract

The utility model relates to the technical field of combustion equipment, in particular to a gas recirculation device in an oxygen-enriched combustion furnace, which uniformly distributes flue gas and is intelligently and automatically controlled. Comprising a smoke outlet pipe connected to a smoke outlet of a combustion furnace and used for leading out smoke generated after combustion; the flue gas treatment unit is connected with the flue gas outlet pipe and is used for treating the led-out flue gas; the recirculation fan is connected with the flue gas treatment unit and is used for providing power for flue gas recirculation; the flue gas distribution header pipe is connected with an outlet of the recirculation fan and is used for collecting the recirculation flue gas; one end of each flue gas distribution branch pipe is connected with the flue gas distribution main pipe, the other end of each flue gas distribution branch pipe extends to different positions in the combustion furnace, and the flue gas distribution branch pipes are used for uniformly distributing recycled flue gas into the combustion furnace; the flow adjusting pieces are arranged on the flue gas distribution branch pipes and used for adjusting the flue gas flow in the branch pipes; and the control system is connected with the combustion furnace, the flue gas treatment unit, the recirculation fan and the flow adjusting piece.

Description

Technical Field

[0001] This utility model relates to the technical field of combustion equipment, and in particular to a gas recirculation device in an oxygen-enriched combustion furnace. Background Technology

[0002] Oxygen-enriched combustion technology is a highly efficient and environmentally friendly combustion method. By increasing the oxygen content in the combustion air, it can significantly improve combustion efficiency and reduce pollutant emissions. In the oxygen-enriched combustion process, the gas recirculation device plays a crucial role, reintroducing a portion of the combusted flue gas into the furnace to control combustion temperature, optimize the combustion process, and reduce nitrogen oxide emissions.

[0003] Existing gas recirculation devices cannot guarantee uniform distribution of flue gas within the furnace when introducing it into the combustion furnace. This results in an uneven temperature field within the furnace, with localized high or low temperature zones affecting combustion efficiency and equipment lifespan. Furthermore, in order to achieve flue gas recirculation, a large amount of energy is required to drive equipment such as fans, increasing operating costs. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a gas recirculation device for an oxygen-enriched combustion furnace that uniformly distributes flue gas and features intelligent automatic control.

[0005] The gas recirculation device inside the oxygen-enriched combustion furnace of this utility model includes:

[0006] The flue gas outlet pipe is connected to the exhaust port of the combustion furnace and is used to draw out the flue gas after combustion.

[0007] The flue gas treatment unit is connected to the flue gas outlet pipe and is used to treat the outlet flue gas;

[0008] The recirculation fan is connected to the flue gas treatment unit and is used to provide power for flue gas recirculation;

[0009] The flue gas distribution manifold is connected to the outlet of the recirculation fan and is used to collect the recirculated flue gas.

[0010] Multiple flue gas distribution branch pipes, one end of which is connected to the flue gas distribution main pipe, and the other end extends to different positions in the combustion furnace, are used to evenly distribute the recirculated flue gas into the combustion furnace;

[0011] A flow regulator is installed on each flue gas distribution branch pipe to regulate the flue gas flow rate in each branch pipe;

[0012] The control system is connected to the combustion furnace, flue gas treatment unit, recirculation fan, and flow regulator.

[0013] Furthermore, the flue gas treatment unit includes:

[0014] Dust collectors are used to remove dust particles from flue gas.

[0015] A heat exchanger is used to regulate the temperature of flue gas. A heat exchanger includes a heat exchange channel that is in communication with an external cooling medium or heating medium.

[0016] Furthermore, the inner walls of both the main flue gas distribution pipe and the branch flue gas distribution pipe are coated with a corrosion-resistant coating.

[0017] Furthermore, a diffusion nozzle is provided at the end of the flue gas distribution branch pipe, and the diffusion nozzle has multiple inclined nozzle holes.

[0018] Furthermore, the flow regulating component is an electric regulating valve, which is connected to the control system.

[0019] Furthermore, a pressure sensor and a flow sensor are installed on the flue gas outlet pipe to monitor the pressure and flow rate of the outlet flue gas and transmit the signals to the control system.

[0020] Furthermore, the combustion furnace is equipped with multiple temperature sensors, which are connected to the control system. The control system adjusts the operating parameters of the flow regulator and the recirculation fan based on the temperature data collected by each temperature sensor.

[0021] Furthermore, the flue gas distribution branches are distributed in a ring or radial pattern within the combustion furnace.

[0022] Furthermore, it also includes a gas replenishment device, which is connected to the flue gas distribution main; the gas replenishment device includes a gas replenishment pipe and a gas replenishment regulating valve, which is connected to the control system.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. By setting up multiple flue gas distribution branches and installing flow regulating devices on the branches, the recirculated flue gas can be evenly distributed to different positions in the combustion furnace, solving the problem that existing devices cannot guarantee the uniform distribution of flue gas in the furnace, making the temperature field in the furnace more uniform, improving combustion efficiency, and extending the equipment life.

[0025] 2. The control system adjusts the operating parameters of the flow regulator and the recirculation fan based on the temperature data collected by the temperature sensor inside the combustion furnace and the signals from the pressure sensor and flow sensor on the flue gas outlet pipe. It can reasonably control the flow and power of the recirculated flue gas, and consumes less energy to drive the fan and other equipment compared with existing technologies, thus reducing operating costs. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a top view of the structure of this utility model;

[0029] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of section AA in the middle;

[0030] The following are labels in the attached diagram: 1. Flue gas outlet pipe; 2. Flue gas treatment unit; 21. Dust collector; 22. Heat exchanger; 3. Recirculation fan; 4. Flue gas distribution main pipe; 5. Flue gas distribution branch pipe; 51. Diffuser nozzle; 6. Flow regulator; 7. Control system; 8. Air supply device; 81. Air supply pipeline; 82. Air supply regulating valve; 10. Combustion furnace; 101. Temperature sensor. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0032] like Figure 1 and Figure 2 As shown, the gas recirculation device inside the oxygen-enriched combustion furnace of this utility model includes:

[0033] The flue gas outlet pipe 1 is connected to the exhaust port of the combustion furnace 10 and is used to draw out the flue gas after combustion.

[0034] Flue gas treatment unit 2 is connected to flue gas outlet pipe 1 and is used to treat the outlet flue gas;

[0035] The recirculation fan 3 is connected to the flue gas treatment unit 2 and is used to provide power for flue gas recirculation;

[0036] The flue gas distribution main duct 4 is connected to the outlet of the recirculation fan 3 and is used to collect the recirculated flue gas;

[0037] Multiple flue gas distribution branch pipes 5 are connected at one end to the flue gas distribution main pipe 4 and at the other end to different positions inside the combustion furnace 10, used to evenly distribute the recirculated flue gas into the combustion furnace 10.

[0038] A flow regulating component 6 is installed on each flue gas distribution branch pipe 5 to regulate the flue gas flow rate in each branch pipe;

[0039] The control system 7 is connected to the combustion furnace 10, the flue gas treatment unit 2, the recirculation fan 3, and the flow regulating component 6;

[0040] During operation, flue gas outlet pipe 1 draws the combusted flue gas from the combustion furnace 10, ensuring that subsequent processes can obtain reusable flue gas, laying the foundation for the entire gas recirculation process. The drawn flue gas flows into flue gas treatment unit 2, which purifies, cools, or heats the flue gas. Purification removes impurities from the flue gas, preventing damage to downstream equipment and improving the purity of the recirculated flue gas, which is beneficial for optimizing the combustion process. Cooling or heating adjusts the flue gas temperature according to combustion requirements, allowing the recirculated flue gas to participate in combustion in a more suitable state, thereby improving combustion efficiency. The system reduces pollutant emissions; the recirculation fan 3 provides power for flue gas recirculation, ensuring continuous flow of flue gas within the system, achieving efficient gas recirculation, and maintaining stable operation of the entire unit; the treated and pressurized flue gas is concentrated by the flue gas distribution main 4 for subsequent uniform distribution; the flue gas flow rate of each branch pipe is adjusted through the flue gas distribution branch pipes 5 and the flow regulator 6, allowing for flexible adjustment of the flue gas supply according to the actual needs of different areas within the combustion furnace, achieving refined control of the combustion process; the control system 7 can monitor and regulate the operating status of the entire unit in real time. Based on feedback information from various parts, such as temperature, pressure, and flow rate, the system optimizes and adjusts equipment operating parameters to achieve automated and intelligent control, improve system operating efficiency, and reduce operating costs.

[0041] The flue gas treatment unit 2 includes:

[0042] Dust collector 21 is used to remove dust particles from flue gas;

[0043] Heat exchanger 22 is used to regulate the temperature of flue gas. Heat exchanger 22 includes a heat exchange channel that communicates with an external cooling medium or heating medium.

[0044] Dust collector 21 uses a variety of technologies such as filtration, centrifugal separation, and electrostatic adsorption to separate dust particles from the flue gas. By removing dust particles, it can effectively prevent them from causing wear to downstream equipment such as recirculation fan 3, flue gas distribution main pipe 4, and flue gas distribution branch pipe 5, thus extending the service life of the equipment and reducing equipment maintenance costs. At the same time, it can reduce the interference of dust on the combustion process, making the recirculated flue gas purer, which is conducive to improving combustion efficiency and further optimizing the oxygen-enriched combustion process. Heat exchanger 22, through a heat exchange channel connected to an external cooling or heating medium, uses heat transfer methods such as heat conduction and convection to realize heat exchange between the flue gas and the medium, thereby regulating the flue gas temperature. It can be flexibly adjusted according to different combustion conditions to ensure that the flue gas participates in combustion in the best state, thereby improving combustion stability and efficiency.

[0045] The inner walls of both the main flue gas distribution pipe 4 and the branch flue gas distribution pipe 5 are coated with a corrosion-resistant coating. This coating is typically made of materials with corrosion-resistant properties, such as ceramic coatings or organic anti-corrosion coatings. These materials adhere tightly to the inner walls of the main flue gas distribution pipe 4 and the branch flue gas distribution pipe 5, forming a barrier. Since the flue gas produced by oxygen-enriched combustion often contains acidic gases such as sulfur dioxide and nitrogen oxides, these gases can cause strong corrosion to metal pipes under certain temperature and humidity conditions. Applying a corrosion-resistant coating isolates the inner wall of the pipe from the corrosive flue gas, significantly reducing the rate of corrosion and minimizing damage such as perforation and rupture. This greatly extends the service life of the main and branch flue gas distribution pipes, reduces equipment replacement frequency, and minimizes downtime losses and economic costs associated with equipment maintenance and replacement. A stable pipe structure is fundamental to ensuring uniform flue gas distribution. If the pipe is damaged by corrosion, it may lead to flue gas leakage, affecting the distribution effect and ultimately disrupting the temperature field and combustion stability within the combustion furnace.

[0046] like Figure 3 As shown, a diffusion nozzle 51 is provided at the end of the flue gas distribution branch pipe 5. The diffusion nozzle 51 has multiple inclined nozzle holes. When the recirculated flue gas enters the diffusion nozzle 51 through the branch pipe, the multiple inclined nozzle holes change the flow direction and velocity distribution of the flue gas. The difference in the spray angle causes the flue gas to diffuse in multiple directions in the combustion furnace 10, achieving a wider spatial coverage and avoiding the concentration of flue gas in a certain area. Compared with ordinary nozzles, it can effectively eliminate dead zones in flue gas distribution, so that all parts of the furnace can obtain a more balanced flue gas supply, thereby optimizing the temperature field in the furnace and improving combustion efficiency.

[0047] The flow regulating component 6 is an electric regulating valve, which is connected to the control system 7. The motor inside the electric regulating valve can precisely control the opening degree of the valve under the drive of the electrical signal issued by the control system 7, so as to realize the dynamic regulation of the flue gas flow rate in each flue gas distribution branch pipe 5.

[0048] Pressure and flow sensors are installed on the flue gas outlet pipe 1 to monitor the pressure and flow rate of the outlet flue gas and transmit the signals to the control system 7. The pressure sensor uses the piezoelectric effect and piezoresistive effect to convert the pressure of the flue gas in the outlet pipe 1 into an electrical signal, providing the control system 7 with real-time and accurate data on the outlet flue gas pressure and flow rate. Based on this data, the control system 7 can fully understand the operating status of the flue gas recirculation system, providing a strong basis for subsequent precise control. For example, when the combustion conditions change, it can promptly detect changes in flue gas parameters so as to respond quickly.

[0049] Multiple temperature sensors 101 are installed inside the combustion furnace 10. These sensors 101 are connected to the control system 7. The control system 7 adjusts the operating parameters of the flow regulator 6 and the recirculation fan 3 based on the temperature data collected by each sensor 101. The temperature sensors 101 sense the temperature inside the combustion furnace 10 based on different physical effects. These sensors 101 are distributed at different locations within the combustion furnace 10, providing comprehensive temperature monitoring. Based on this real-time and accurate temperature data, the control system 7 can accurately determine the combustion status in each area of ​​the furnace. If the temperature in a certain area deviates from the set value, the control system 7 will... The control system 7 will quickly adjust the flow regulating component 6, change the flue gas flow rate of each flue gas distribution branch pipe 5, and adjust the operating parameters of the recirculation fan 3 to control the amount of recirculated flue gas, thereby bringing the temperature inside the combustion furnace back to the ideal state and ensuring that the combustion process is always efficient and stable. By precisely controlling the temperature inside the combustion furnace 10, the control system 7 can optimize the mixing ratio of fuel, air, and recirculated flue gas. Because different combustion reactions can achieve the best efficiency at specific temperatures, adjusting relevant parameters based on feedback from the temperature sensor 101 can make combustion more complete, reduce fuel waste, reduce pollutant emissions, and improve energy utilization.

[0050] The flue gas distribution branch pipes 5 are arranged in a ring or radial pattern within the combustion furnace 10. When arranged in a ring, the flue gas distribution branch pipes 5 are arranged around the central axis of the combustion furnace 10, forming one or more concentric ring pipe structures. This layout allows the recirculated flue gas delivered from the main flue gas distribution pipe 4 to be evenly dispersed radially along the ring branch pipes, forming a relatively uniform flue gas distribution within the ring area. When arranged radially, the flue gas distribution branch pipes 5 extend outwards from the center or near the center of the combustion furnace 10 like rays. The recirculated flue gas spreads quickly and evenly from the center through these radial branch pipes to all corners of the combustion furnace, ensuring sufficient flue gas supply in different directions. The ring or radial distribution has strong flexibility and can adapt to combustion furnaces 10 of different shapes and sizes, as well as different combustion process requirements.

[0051] Preferably, it also includes a gas replenishment device 8, which is connected to the flue gas distribution main pipe 4. The gas replenishment device 8 includes a gas replenishment pipe 81 and a gas replenishment regulating valve 82, which is connected to the control system 7. Different combustion processes and fuel characteristics have different requirements for the combustion atmosphere. When the combustion process requires additional gas, the control system 7 sends a command to the gas replenishment regulating valve 82 connected to it according to parameters such as temperature, pressure, and combustion status in the combustion furnace 10. The gas replenishment regulating valve 82 adjusts its opening according to the command to control the gas flow rate that is replenished from the gas replenishment pipe 81 into the flue gas distribution main pipe 4. The replenished gas enters the combustion furnace 10 together with the recirculated flue gas, thereby changing the gas composition and proportion in the combustion furnace 10.

[0052] The gas recirculation device in the oxygen-enriched combustion furnace of this utility model, when in operation, starts the recirculation fan 3 to provide power for flue gas recirculation. The flue gas after combustion is drawn out from the exhaust port of the combustion furnace 10 through the flue gas outlet pipe 1. At this time, the pressure sensor and flow sensor on the flue gas outlet pipe 1 monitor the pressure and flow of the drawn flue gas in real time and transmit the signals to the control system 7. The drawn flue gas enters the flue gas treatment unit 2. In the flue gas treatment unit 2, the dust particles in the flue gas are first removed by the dust collector 21, and then the flue gas temperature is adjusted by the heat exchanger 22 to make the flue gas reach a suitable recirculation condition. The treated flue gas enters the recirculation fan 3 to obtain power, and is collected in the flue gas distribution main pipe 4 through the outlet of the recirculation fan 3. Then the flue gas enters the combustion furnace 10 through multiple flue gas distribution branch pipes 5. The flow regulating component 6 adjusts the flow based on the multiple temperature sensors 1 and 2 inside the combustion furnace 10. The system collects temperature data and uses signals from pressure and flow sensors on flue gas outlet pipe 1 to adjust the flue gas flow rate in each branch pipe, ensuring uniform distribution of flue gas. When additional gas is needed during combustion, the control system 7 sends a command to the gas supply regulating valve 82 in the gas supply device 8 connected to the flue gas distribution main pipe 4 based on parameters such as temperature, pressure, and combustion status within the combustion furnace 10. The gas supply regulating valve 82 adjusts its opening according to the command, controlling the flow rate of gas supplied to the flue gas distribution main pipe 4 through the gas supply pipeline 81. The supplied gas enters the combustion furnace 10 along with the recirculated flue gas, optimizing the combustion process. The control system 7 monitors and regulates the operating status of the entire device in real time, and optimizes and adjusts the equipment operating parameters based on feedback information from various parts, achieving automated and intelligent control and ensuring stable and efficient operation of the gas recirculation device within the entire oxygen-enriched combustion furnace.

[0053] The gas recirculation device in the oxygen-enriched combustion furnace of this utility model can be installed, connected, or set in a common mechanical manner, and can be implemented as long as it can achieve its beneficial effects.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gas recirculation device for an oxygen-enriched combustion furnace, characterized in that, include: A flue gas outlet pipe (1) is connected to the exhaust port of the combustion furnace (10) to draw out the flue gas after combustion; The flue gas treatment unit (2) is connected to the flue gas outlet pipe (1) and is used to treat the outgoing flue gas; A recirculation fan (3) is connected to the flue gas treatment unit (2) to provide power for flue gas recirculation; The flue gas distribution manifold (4) is connected to the outlet of the recirculation fan (3) for collecting recirculated flue gas; Multiple flue gas distribution branch pipes (5) are connected at one end to the main flue gas distribution pipe (4) and at the other end to different positions inside the combustion furnace (10) to distribute the recirculated flue gas evenly into the combustion furnace (10); A flow regulating component (6) is provided on each of the flue gas distribution branch pipes (5) to regulate the flue gas flow rate in each branch pipe; The control system (7) is connected to the combustion furnace (10), the flue gas treatment unit (2), the recirculation fan (3) and the flow regulator (6).

2. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The flue gas treatment unit (2) includes: Dust collector (21) is used to remove dust particles from flue gas; A heat exchanger (22) is used to regulate the temperature of flue gas, the heat exchanger (22) including a heat exchange channel in communication with an external cooling medium or heating medium.

3. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The inner walls of the flue gas distribution main pipe (4) and the flue gas distribution branch pipe (5) are coated with a corrosion-resistant coating.

4. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The end of the flue gas distribution branch pipe (5) is provided with a diffusion nozzle (51), which has multiple inclined nozzle holes.

5. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The flow regulating component (6) is an electric regulating valve, which is connected to the control system (7).

6. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The flue gas outlet pipe (1) is equipped with a pressure sensor and a flow sensor to monitor the pressure and flow rate of the outlet flue gas and transmit the signals to the control system (7).

7. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The combustion furnace (10) is equipped with multiple temperature sensors (101), which are connected to the control system (7). The control system (7) adjusts the operating parameters of the flow regulator (6) and the recirculation fan (3) based on the temperature data collected by each temperature sensor (101).

8. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, The flue gas distribution branch pipe (5) is distributed in a ring or radial pattern within the combustion furnace (10).

9. The gas recirculation device in an oxygen-enriched combustion furnace as described in claim 1, characterized in that, It also includes a gas replenishment device (8), which is connected to the flue gas distribution main pipe (4); the gas replenishment device (8) includes a gas replenishment pipe (81) and a gas replenishment regulating valve (82), which is connected to the control system (7).

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