A kind of integrated system and method for local oxygen-increasing precise combustion support of comprehensive energy saving and emission reduction and yield increasing and efficiency improving type of industrial furnace

Abstract

In order to overcome the deficiency of the existing local oxygen-increasing combustion-supporting integrated system, the application provides a comprehensive energy-saving emission-reducing production-increasing efficiency-improving type local oxygen-increasing precise combustion-supporting integrated system and method for industrial furnace.The system comprises four parts of an oxygen source, a precise oxygen-increasing combustion-supporting system, an electric control system and a monitoring and protection system.The local oxygen-increasing precise combustion-supporting integrated system provided by the application is suitable for various industrial furnaces.The system is simple to install, easy to operate and maintain, and some can be installed without stopping the furnace, and has better comprehensive energy-saving emission-reducing production-increasing efficiency-improving effect.

Description

Technical Field

[0001] This invention relates to the field of local oxygen enhancement and combustion assistance in industrial furnaces and kilns, and particularly to an integrated system for local oxygen enhancement and precise combustion assistance for comprehensive energy saving, emission reduction, production increase and efficiency improvement in industrial furnaces and kilns. Background Technology

[0002] Industrial furnaces generally use either ordinary air combustion or overall oxygen-enriched combustion. The former is because air contains less than 21% oxygen, with the rest being inert gases. These gases not only do not participate in combustion but also absorb a large amount of heat, thus reducing the performance and efficiency of industrial furnaces. The latter generally involves very large investments and has many side effects, such as a significant decrease in furnace life and burner life, and a significant increase in NOx.

[0003] Currently, only Shen Guanglin, Yu Xuan, Shen Bo, and Wei Boqing have proposed related patents on local oxygen enrichment for combustion. For example, CN97104465.1 discloses a membrane-based method for local oxygen enrichment and combustion in an industrial heating furnace. This method uses a membrane to prepare oxygen-enriched gas to replace part of the air, thereby improving the combustion efficiency of the fuel through local oxygen enrichment.

[0004] CN00110217.6 discloses a method for localized oxygen-enriched combustion in a glass furnace. This method comprises an oxygen-enriched system connected to an oxygen-enriched nozzle via a reversing system and a preheating system. The oxygen-enriched nozzle is positioned below the fuel nozzle in the furnace, with a flat front end, a width-to-height ratio of 1.3–3.5, and a nozzle angle of 5–70°. Oxygen-enriched air is blown between the fuel nozzle and the molten glass surface in the original glass furnace.

[0005] CN02281418.3 discloses a local oxygen-enrichment combustion-aiding system for boilers, which adds a local oxygen-enrichment combustion-aiding system to the front of the original boiler. The system mainly consists of five parts: an oxygen production system, a pressure stabilization system, a preheating system, an oxygen-enriching nozzle system, and an automatic control and regulation system. Only the preheating system and the oxygen-enriching nozzle system are in contact with the boiler.

[0006] CN200420004099.4 discloses a local oxygen-enriched gradient combustion system for float glass melting furnaces. Without any power equipment, it adopts local oxygen-enriched gradient combustion technology, in which oxygen-enriched air is preheated by a pressure stabilizing protection device and an oxygen-enriched high-temperature preheater, and then sent into a space below the flame and above the glass surface in the melting furnace through a dedicated oxygen-enriched nozzle, forming gradient combustion, so that the exhaust gas becomes the oxygen source for implementing the local oxygen-enriched combustion technology.

[0007] CN200420014005.1 discloses a local oxygenation and combustion-aiding device for industrial furnaces and kilns. It adopts a local oxygenation method, which concentrates local oxygenation. The oxygen-enriched air is sent into the heat exchanger by a booster fan to increase the gas temperature, and then directly injected into the fuel layer by a nozzle set in the combustion furnace at a close distance (3-25cm) to assist combustion.

[0008] CN200910010412.2 discloses a comprehensive energy-saving and emission-reducing local oxygen-enriching combustion aid device and method, which connects a dedicated oxygen-enriching preheater and a dedicated oxygen-enriching nozzle into a whole, preferably by welding. This not only avoids the problems of previous patents that used two oxygen-enriching nozzles symmetrically installed, required additional insulation at the rear, and left the high-temperature metal hose of the furnace head exposed, which was very unsafe.

[0009] CN201010271825.9 discloses a method and apparatus for increasing combustion temperature in a combustion furnace by using oxygen-enriched local oxygen-enriched jets. This method maximizes the temperature of the combustion flame zone without increasing fuel consumption or changing any structure of the original furnace, and only requires the oxygen-enriched preheating system and oxygen-enriched nozzles to contact the furnace body.

[0010] CN201010271852.6 discloses a method and apparatus for increasing the production load of a combustion furnace by using oxygen-enriched local oxygen-enriched jet combustion, which maximizes the temperature of the combustion flame zone, thereby increasing the production load while keeping the original process parameters unchanged by increasing the flow rate of the heated medium.

[0011] CN201010115450.7 discloses a method and apparatus for improving thermal efficiency of a combustion furnace by using oxygen-enriched local oxygen-enriched jet combustion, which maintains reduced combustion air volume and complete fuel combustion, and can also maximize the temperature of the combustion flame area, thereby maximizing the thermal radiation of flue gas.

[0012] CN200920023792.9 discloses a membrane-based oxygen-enriched local oxygen-enriched symmetrical combustion jet combustion-assisted energy-saving system, which adds a chemical filter, a preheater protection device, an oxygen-enriched distributor, and a nozzle fine-tuning device. The chemical filter is connected between the outlet of a high-efficiency air filter and an air supply device. The inlet of the oxygen-enriched distributor is connected to the outlet of the preheater. The multiple outlets of the oxygen-enriched distributor are respectively connected to oxygen-enriched nozzles. The nozzle fine-tuning device is set on the pipe connecting the outlet of the oxygen-enriched distributor and the oxygen-enriched nozzle. The preheater protection device is set on the pipe connecting the preheater, the gas-liquid separator, and the oxygen-enriched distributor. It includes two valves and an air inlet pipe and a vertical exhaust pipe equipped with valves.

[0013] CN201810488723.9 discloses a novel integrated energy-saving, emission-reducing, production-increasing, and efficiency-enhancing local oxygen-enriched combustion system for fuel-fired furnaces. The device includes seven parts: an oxygen source, a pressurization system, an oxygen-enriched high-efficiency preheater and a dedicated oxygen-enriched nozzle, an alarm device, an oxygen-enriched flow transmitter and a micro-pressure transmitter, an emergency stop device, and an electrical control system. This solution must not only be compatible with the relevant furnaces and kilns, but also with the fuel and the corresponding combustion method, and more importantly, with the performance of the relevant products.

[0014] CN202111511698.X discloses a method and system for precise combustion with local oxygenation in fuel furnaces, which is energy-saving, emission-reducing, production-increasing, and efficiency-enhancing. It obtains high-temperature oxygen enrichment by extracting high-temperature gas from the fuel furnace and mixing it with an oxygen source. Furthermore, it designs specific oxygen-enriching nozzle positions for specific types of fuel furnaces, so that the high-temperature oxygen enrichment is delivered to the parts of the product in the fuel furnace that require the most oxygen, thus achieving precise combustion with local oxygenation.

[0015] However, the aforementioned existing technologies have the following shortcomings:

[0016] 1. Disadvantages of using membrane methods for oxygen sources:

[0017] (1) The oxygen-enriched membrane module adopts a spiral type, which not only has high resistance and increases power consumption, but also has high assembly cost;

[0018] (2) Most of them use water ring vacuum pumps as the main power source, which are not only rich in oxygen and water, but also require pipeline pumps to control the circulating water volume and the influence of circulating water temperature.

[0019] (3) Adding a booster fan to increase the oxygen enrichment pressure to meet the process requirements is not only difficult to match, but also increases maintenance and operating costs;

[0020] (4) To increase the oxygen-enriched temperature to meet the process requirements, an oxygen-enriched preheater needs to be added, which not only requires opening holes in the flue of the furnace but also increases maintenance costs.

[0021] 2. For some furnaces, the compact site makes it impossible to implement local oxygen-enriched combustion technology;

[0022] 3. Extracting high-temperature flue gas from the furnace is not practical: First, the furnace is under negative pressure; second, the flue gas in the furnace is high-temperature and may even have open flames, posing a great danger; third, the high-temperature flue gas not only contains a lot of dust but is also highly corrosive, which can easily damage the high-temperature fan; fourth, the oxygen content in the flue gas is relatively low, reducing the oxygen enrichment quality; and fifth, it requires opening holes in the high-temperature furnace wall, etc.

[0023] In summary, there is an urgent need in this field for an integrated system that combines energy conservation, emission reduction, production increase, and efficiency improvement with localized oxygen enhancement and precise combustion support, suitable for various industrial furnaces and kilns. Summary of the Invention

[0024] To overcome the shortcomings of existing local oxygen-enhancing combustion-supporting integrated systems, this invention provides a local oxygen-enhancing precision combustion-supporting integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement in industrial furnaces and kilns.

[0025] The present invention provides an integrated system for comprehensive energy conservation, emission reduction, production increase, and efficiency improvement in industrial furnaces and kilns, characterized by localized oxygen enhancement and precise combustion. The technical solution involves adding a localized oxygen enhancement and precise combustion system next to the industrial furnace or kiln. This system is applicable to various industrial furnaces and kilns, including grate furnaces, heating furnaces, incinerators, fluidized bed furnaces, pulverized coal furnaces, heat medium furnaces, fuming furnaces, smelting furnaces, cupola furnaces, oil (gas) kilns, alumina kilns, ceramic kilns, glass kilns, and rotary kilns for pelletizing (lime, cement, etc.) for comprehensive energy conservation, emission reduction, production increase, and efficiency improvement.

[0026] The system comprises four parts: an oxygen source, a precise oxygenation and combustion-supporting system, an electrical control system, and a monitoring and protection system. The oxygen source and the precise oxygenation and combustion-supporting system are connected together. The electrical control system is connected to the oxygen source, the precise oxygenation and combustion-supporting system, and the monitoring and protection system via cables and control lines. The monitoring and protection system is connected to the precise oxygenation and combustion-supporting system for real-time monitoring.

[0027] Furthermore, the oxygen source includes byproducts of oxygen production by vacuum pressure swing adsorption (VPSA), novel membrane oxygen production, membrane nitrogen production, or cryogenic processes.

[0028] Furthermore, the monitoring and protection system is connected to the oxygen source of VPSA oxygen generation or new membrane oxygen generation.

[0029] The preferred oxygen sources are VPSA oxygen production and membrane oxygen production. More preferably, to ensure the integrated system for precise localized oxygen enhancement and combustion achieves optimal energy saving, emission reduction, increased production, and improved efficiency, VPSA oxygen sources offer significant advantages when the oxygen concentration is greater than 30% and the oxygen enrichment flow rate is greater than 1200 Nm³ / h. This is because the optimal oxygen concentration can be selected according to the furnace requirements within the 30-95% range, the oxygen-enriched air dew point is less than 0°C, resulting in better combustion enhancement, lower operating costs, larger scale, and greater maturity. For oxygen sources with an oxygen concentration less than 30% and an oxygen enrichment flow rate less than 1200 Nm³ / h, novel membrane oxygen sources offer advantages because these membrane oxygen sources use plate-type oxygen enrichment modules, which have approximately half the resistance of spiral-wound oxygen enrichment modules.

[0030] In a preferred embodiment, the precise oxygen-enriched combustion system includes a pressure stabilizing system, an oxygen-enriched preheating and nozzle system, or an oxygen-enriched nozzle system. The pressure stabilizing system mainly consists of an oxygen-enriched pressure stabilizing tank and corresponding valves.

[0031] The aforementioned precision oxygen-enriched combustion system also includes a vacuum booster pump. This pump not only consumes about 30% less energy than the air-cooled reciprocating vacuum pump in CN201810488723.9, but is also three times larger in scale. It does not require circulating water cooling, making operation simpler. It replaces the original process's water-ring vacuum pump, pipeline pump and circulating water system, dehumidification and demisting system, booster fan and oxygen-enriched preheater in one fell swoop, achieving an oxygen-enriched outlet pressure of 2-30 kPa and an oxygen-enriched temperature of 100-180°C. It can be installed without shutting down the furnace and is particularly suitable for heating furnaces and boilers in this field.

[0032] Furthermore, the aforementioned precision oxygenation and combustion-aiding system also includes combustion-aiding air ducts.

[0033] Furthermore, the aforementioned precision oxygenation and combustion-aiding system also includes an ejector and a high-temperature fan.

[0034] Furthermore, the aforementioned precision oxygenation and combustion-supporting system also includes a micro-pressure gauge and a temperature gauge, wherein the micro-pressure gauge is connected to an automatic micro-pressure regulating valve, and the temperature gauge is connected to a temperature transmitter.

[0035] The oxygen-enriched preheating and nozzle system can include a device with a curved nozzle, comprising an integrated structure consisting of an outer connecting rod A, a preheating section B, and a curved nozzle C. The outer connecting rod A is columnar, and the inner connecting rod B is a cuboid with a base. The curved nozzle C is composed of an outlet end C1 with a parallelogram cross-section and a bent portion C2 with a rectangular cross-section. C1 and C2 can form a certain angle in the horizontal and / or vertical directions, with an angle range of ±85°. This angle is designed according to the site conditions of the industrial furnace, so that the curved nozzle of the oxygen-enriched preheating system is located inside the furnace wall and directly delivers the flame to the center. Generally, the design of dedicated oxygen-enriched nozzles does not consider the need for the nozzle itself to be curved. However, some furnace sites have limited space, and if a normally designed oxygen-enriched nozzle is installed, it will not achieve the expected effect. Therefore, it is necessary to design a dedicated oxygen-enriched nozzle with a certain angle based on the site conditions. This angle can be adjusted not only ±85° vertically, but also, in some cases, ±85° horizontally, to ensure the safety of industrial furnace operation and achieve optimal energy saving, emission reduction, production increase, and efficiency improvement.

[0036] The oxygen-enriched preheating and nozzle system has an external connecting rod A placed outside the furnace wall and connected to the pressure stabilizing system, a preheating section B placed inside the furnace wall with a length comparable to the furnace wall thickness, and an elbow nozzle C inserted into the furnace wall 10-500mm. It utilizes the high-temperature airflow in the furnace to rapidly heat the gas, further improving the quality of oxygen enrichment and achieving energy saving and emission reduction. In contrast, the traditional process involves adding an oxygen-enriched preheater inside the flue, which is not only difficult to install but also more difficult to maintain.

[0037] The electrical control system includes a fully automatic control system that controls the start / stop of the local oxygen-enriched combustion integrated system and the interlocking function of the furnace, or connects to the user's DCS for easier operation. Simultaneously, a monitoring and protection system remotely monitors the local oxygen-enriched precision combustion integrated system, ensuring the safe and stable operation of the system and the industrial furnace. This electrical control system supplies power to the electrical instruments of the entire system, connecting to the blower, electric butterfly valve, and vacuum booster pump via cables and control lines. The blower, electric butterfly valve, and vacuum booster pump are turned on sequentially according to the operating procedure. After the system is running normally, the oxygen enrichment pressure and temperature are very stable. The electrical control system is equipped with an automatic alarm. If the electric butterfly valve malfunctions, the vacuum booster pump current is too high, or the oxygen enrichment pressure or temperature is outside the design range, the system will automatically alarm, alerting relevant personnel to promptly investigate and resolve the cause, ensuring the safe and stable operation of the system.

[0038] The monitoring system includes cameras, a data storage unit, and a remote monitoring system: it can not only remotely monitor the operation of the local oxygen enhancement and precision combustion-supporting integrated system at any time, but also issue alarms in case of problems and remind relevant personnel to resolve them in a timely manner, ensuring the safe and stable operation of the local oxygen enhancement and precision combustion-supporting integrated system.

[0039] This invention also seeks protection for the operation flow of the above-mentioned integrated system:

[0040] S1. The electrical control system is activated, turning on the VPSA oxygen source, the precision oxygen-enriched combustion system, and the monitoring and protection system, and using high-concentration oxygen enrichment to ignite the industrial furnace.

[0041] S2. After the industrial furnace system is in normal operation, the high-temperature combustion air and high-concentration oxygen in the industrial furnace are mixed and precisely delivered to the flame center of the industrial furnace through the ejector and high-temperature and high-pressure fan using the oxygen-enriched nozzle system; the oxygen-enriched pressure and temperature remain stable, with an oxygen-enriched outlet pressure of 2-100KPa, an oxygen-enriched temperature of 100-500℃, and an oxygen-enriched concentration of 25-65%.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) For membrane oxygen sources, the system of the present invention does not require the use of the original process's water ring vacuum pump, pipeline pump and circulating water system, dehumidification and demisting system, booster fan and oxygen enrichment preheater, and can achieve an oxygen enrichment outlet pressure of 2-30KPa and an oxygen enrichment temperature of 100-180℃, and can be installed without shutting down the furnace.

[0044] (2) For VPSA oxygen source, the present invention provides a set of optimal energy-saving, emission-reduction, production-increasing and efficiency-enhancing systems and processes: ① When used for ignition of industrial furnaces: Since the oxygen concentration of VPSA can reach up to about 95%, it can not only shorten the ignition time, but also save high-quality fuel (diesel or natural gas); ② When used for normal operation of industrial furnaces: High-temperature combustion air and high-concentration oxygen of VPSA are used in industrial furnaces to obtain high-quality oxygen through ejector and high-temperature and high-pressure blower, and then a special oxygen-enhancing nozzle is used to accurately deliver it to the flame center of industrial furnaces to achieve the best energy-saving, emission-reduction, production-increasing and efficiency-enhancing effects.

[0045] (3) The present invention draws high-temperature flue gas from the furnace instead of high-temperature flue gas from the furnace, and draws high-temperature air from the combustion air duct of the furnace. Although the oxygen enrichment temperature is lower, the oxygen enrichment concentration is 3-6% higher than that of the traditional method. Moreover, the installation is simpler, the operation and maintenance are easier, and the overall effects of energy saving, emission reduction, production increase and efficiency improvement are better.

[0046] In summary, the localized oxygen-enhancing precision combustion-supporting integrated system provided by this invention has a wide range of applications and is suitable for various industrial furnaces and kilns. This system is simple to install, easy to operate and maintain, and offers better overall energy-saving, emission-reduction, production-increasing, and efficiency-enhancing effects. Attached Figure Description

[0047] This invention has a total of appendices Figure 6 Size:

[0048] Figure 1 This is a schematic diagram of the structure of the present invention.

[0049] Figure 2 This is a schematic diagram of a membrane-based local oxygen enhancement and precision combustion-aiding integrated system for gas-fired boilers.

[0050] Figure 3 This is a schematic diagram of a VPSA (Volume-Assisted Gas Response) local oxygen enhancement and precision combustion integration system for fluidized bed boilers.

[0051] Figure 4 This is a schematic diagram of an integrated system for precise combustion enhancement using oxygen-enriched local oxygenation, an industrial byproduct, in pulverized coal boilers.

[0052] Figure 5 This is a schematic diagram of a membrane-based oxygen-enriched local oxygen-enhancing precision combustion-supporting integrated system for gas-fired heating furnaces.

[0053] Figure 6 This is a schematic diagram of the oxygen-enriched preheating and nozzle system.

[0054] The components include: 1. Filter; 2. Ventilator; 3. Control butterfly valve; 4. Air distribution box; 5. Exhaust gas regulating valve; 6. Plate-type oxygen enrichment assembly; 7. Vacuum distributor; 8. Vacuum gauge; 9. Electric switching valve; 10. Vacuum booster pump; 11. Automatic micro-pressure regulating valve; 12. Oxygen concentration meter and sensor; 13. Pressure gauge and pressure transmitter; 14. Temperature gauge and temperature transmitter; 15. Oxygen enrichment pressure stabilizing tank; and 16. Automatic regulating valve. 17. Oxygen-enriched nozzle inlet; 18. Furnace wall; 19. Flame center; 20. Blower; 21. Water cooler; 22. Instrument gas storage tank; 23. Oxygen generating equipment; 24. Oxygen-enriched buffer tank; 25. Ejector; 26. High-temperature fan; 27. Vacuum pump sealed water tank; 28. Vacuum pump; 29. ​​Steam-water separator; 30. Oxygen-enriched membrane unit; A. External connecting rod; B. Preheating section; C. Elbow nozzle; C1. Outlet end; C2. Bending section. Detailed Implementation

[0055] To more clearly illustrate the purpose, technical solutions, and advantages of this disclosure, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of this disclosure and should not be construed as limiting the disclosure. In the specification and drawings, the same or similar reference numerals refer to the same or similar parts or components. For clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted from the drawings.

[0056] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] In this invention, industrial furnaces and kilns include grate furnaces, heating furnaces, incinerators, fluidized bed furnaces, pulverized coal furnaces, heat medium furnaces, fuming furnaces, smelting furnaces, cupola furnaces, oil (gas) kilns, alumina kilns, ceramic kilns, glass kilns, and rotary kilns for pelletizing (lime, cement, etc.). The following embodiments use representative gas-fired boilers, fluidized bed boilers, pulverized coal furnaces, and gas-fired heating furnaces as examples.

[0060] To better provide localized oxygenation and combustion assistance, the precise oxygenation and combustion assistance system varies in structure depending on the oxygen source and the specific industrial furnace.

[0061] When the oxygen source is a novel membrane method, the filter, fan, oxygen-enriched membrane unit, vacuum booster pump, oxygen-enriched pressure tank, and oxygen-enriched preheating & nozzle system or oxygen-enriched nozzle system are connected in sequence. The oxygen-enriched preheating & nozzle system or oxygen-enriched nozzle system is inserted into the furnace wall of the industrial furnace to precisely deliver oxygen to the center of the flame.

[0062] When the oxygen source is VPSA, the oxygen generating equipment, oxygen-enriched buffer tank, ejector, high-temperature fan, oxygen-enriched pressure stabilizing tank, and oxygen-enriched preheating & nozzle system or oxygen-enriched nozzle system are connected in sequence. The ejector is also connected to the combustion air duct. The oxygen-enriched preheating & nozzle system or oxygen-enriched nozzle system is inserted into the furnace wall of the industrial furnace to precisely deliver oxygen to the center of the flame.

[0063] When the oxygen source is industrial by-product oxygen enrichment, the oxygen production equipment, oxygen enrichment buffer tank, ejector, oxygen enrichment pressure stabilizing tank, and oxygen enrichment preheating & nozzle system or oxygen enrichment nozzle system are connected in sequence. The ejector is also connected to the combustion air duct. The oxygen enrichment preheating & nozzle system or oxygen enrichment nozzle system is inserted into the furnace wall of the industrial furnace to accurately deliver oxygen enrichment to the center of the flame.

[0064] Example 1

[0065] This embodiment describes a novel membrane-based local oxygen enhancement and precision combustion-supporting integrated system for a 75-ton gas-fired boiler.

[0066] The oxygen source is prepared using a novel membrane method, and the industrial furnace is a gas-fired boiler.

[0067] In this embodiment, the electrical control system is connected to the oxygen source, the precision oxygenation and combustion assist system, and the monitoring and protection system via cables and control lines. The oxygen source enters the industrial furnace through the precision oxygenation and combustion assist system, achieving energy saving and emission reduction.

[0068] The monitoring and protection system includes cameras, a data storage unit, and a remote monitoring system. The remote monitoring system includes a parameter acquisition module, a communication module, and a back-end monitoring computer or mobile phone to monitor the oxygen source and the precise oxygenation and combustion assistance system in real time.

[0069] The communication module can be a serial-to-ZiGBEE communication module. The parameter acquisition module is connected to the controller, and the controller is wirelessly connected to a backend monitoring computer or mobile phone via the communication module. The mobile phone or computer can monitor the precision oxygenation and combustion assist system from anywhere. If any problems arise, relevant personnel can be notified at any time to resolve them, ensuring the safe and stable operation of the system.

[0070] Several cameras are installed at any location within the integrated system for precise combustion enhancement and localized oxygen enrichment in industrial furnaces and kilns, designed for comprehensive energy saving, emission reduction, production increase, and efficiency improvement. This allows for real-time monitoring of the integrated system's processes. The cameras transmit real-time data on the online instruments and the opening and closing status of each control valve, which operators can observe at any time via computer or mobile phone. Field instruments transmit data to the data storage unit via transmitters, generating and saving data and curves. Based on the field data, the software, through the electrical control system, controls the opening and closing of each control valve, ensuring that the oxygen enrichment flow, concentration, pressure, and temperature remain within the design range.

[0071] The data storage unit is built into the system's PLC. The camera, data storage unit, and remote monitoring system are all connected together via the PLC.

[0072] Precision oxygenation and combustion enhancement system, such as Figure 2 As shown, filter 1, fan 2, electric butterfly valve 3, air distribution box 4, and plate-type oxygen enrichment assembly 6 are connected in sequence. The plate-type oxygen enrichment assembly 6 is equipped with a waste gas regulating valve 5. The vacuum port of the plate-type oxygen enrichment assembly 6 is connected to a control valve and a vacuum distributor 7. The vacuum distributor 7, vacuum gauge 8, electric switching valve 9, vacuum booster pump 10, automatic micro-pressure regulating valve 11, oxygen concentration meter and sensor 12, pressure gauge and pressure transmitter 13, temperature gauge and temperature transmitter 14, and oxygen enrichment pressure stabilizing tank 15 are connected in sequence. The oxygen enrichment pressure stabilizing tank 15 is connected to the oxygen enrichment preheating & nozzle system. An automatic regulating valve 16 is installed between the oxygen enrichment pressure stabilizing tank 15 and the oxygen enrichment preheating & nozzle system 17. The preheating section and curved nozzle of the oxygen enrichment preheating & nozzle system are inserted into the furnace wall 18 and finally enter the gas boiler. After passing through the preheating section and outlet of the nozzle, the gas is directly delivered to the flame center 19. Because there is an observation hole near the gas nozzle of this furnace, it will affect the nozzle installation in the oxygen enrichment preheating & nozzle system. In this embodiment, in order to deliver oxygen to the center of the flame precisely to enhance combustion, it is calculated that the nozzle outlet end C1 in the oxygen-enriched preheating & nozzle system should be adjusted upward to about 8° and then to about 5° to the right. With the center of the flame as the reference, the installation position of the nozzle in the oxygen-enriched preheating & nozzle system should be moved down about 100mm and to the left about 50mm.

[0073] The process flow is as follows: After being filtered by filter 1, air is sent to air distribution box 4 by fan 2 via electric butterfly valve 3, ensuring uniform pressure before being sent to plate-type oxygen-enriching component 6 for separation. Its exhaust port is connected to exhaust gas control valve 5 and then discharged. The remaining oxygen is connected to control valve and vacuum distributor 7 through vacuum port of plate-type oxygen-enriching component 6, and then enters the pressure stabilization system of precision oxygen-enriching combustion system. That is, the oxygen first flows through vacuum gauge 8, electric switch valve 9 and vacuum booster pump 10 to extract oxygen to achieve the designed oxygen enrichment flow rate and concentration. If the oxygen enrichment flow rate is higher than the design, the control valve of plate-type oxygen-enriching component 6 can be closed to control it. After passing through the vacuum booster pump 10, the oxygen-enriched flow flows through the automatic micro-pressure regulating valve 11, the oxygen concentration meter and sensor 12, the pressure gauge and pressure transmitter 13, the temperature gauge and temperature transmitter 14, and enters the oxygen-enriched pressure stabilizing tank 15. It then passes through the automatic regulating valve 16 and the oxygen-enriched preheating & nozzle system 17, and finally enters the gas-fired boiler. After passing through the preheating section of the nozzle and the outlet, it is directly delivered to the flame center 19.

[0074] Existing technologies typically employ water ring vacuum pumps, which require cooling water circulation for cooling and, due to the presence of oxygen-rich, saturated water vapor, necessitate dehumidification, resulting in poor energy-saving and emission-reduction effects. In this embodiment, a vacuum booster pump 10 is selected, eliminating the need for cooling and dehumidification processes. Furthermore, using a vacuum booster pump can achieve the designed vacuum level and oxygen-rich pressure of 2-30 kPa, with an oxygen-rich temperature of 100-180°C.

[0075] In this embodiment, the gas-fired boiler is equipped with an oxygen enrichment capacity of more than 800 standard cubic meters per hour, and the oxygen enrichment power supply is only 59KW. Since the vacuum booster pump is air-cooled, not only is the oxygen enrichment concentration about 0.5% higher than the original process, but the power supply is also 30KW less. At the same time, the oxygen enrichment temperature is about 60°C higher, eliminating the need for preheating by the boiler's high-temperature flue gas. This makes installation simpler, operation and maintenance more convenient, and energy saving and emission reduction effects better.

[0076] Based on the experience evaluation of nearly 200 industrial furnaces implemented by inventor Shen Guanglin, the precise combustion-aiding integrated technology of this embodiment generally saves 2-5% of gas, reduces CO emissions by 10-95%, reduces NOx by 5-30%, increases load by 5-30%, reduces flue gas temperature by 5-20℃, and reduces flue gas oxygen content by 0.3-1.5%, resulting in significant comprehensive effects of energy saving, emission reduction, production increase, and efficiency improvement.

[0077] Example 2

[0078] This embodiment uses a VPSA local oxygen enhancement precision combustion-supporting integrated system for a 410-ton fluidized bed boiler.

[0079] In this embodiment, the oxygen source is connected to the precision oxygenation and combustion assist system, and the electrical control system is connected to the oxygen source, the precision oxygenation and combustion assist system, and the monitoring and protection system respectively via cables and control lines.

[0080] In this embodiment, the industrial furnace is a fluidized bed boiler. When using VPSA oxygen source, the precision oxygenation and combustion assist system is slightly adjusted. The electrical control system and monitoring and protection system are basically the same as in Embodiment 1, and will not be described again.

[0081] Combination Figure 3 The integrated system in this embodiment consists of two parts. The first part is the VPSA oxygen generator, which uses molecular sieves to selectively adsorb nitrogen in the air under normal temperature conditions. The pressure of the adsorption tower is reduced to desorb the nitrogen adsorbed in the molecular sieve, thereby realizing the adsorption-desorption cycle operation and continuously producing oxygen-enriched air with a purity of more than 80%, which can be stabilized at around 95%. During implementation, the optimal oxygen enrichment concentration range (30-95%) can be selected according to the operating conditions of the industrial furnace.

[0082] The second part involves the gas ejector drawing high-temperature combustion air through the combustion air duct, mixing it with a high concentration of oxygen, and then introducing it into a pressure stabilizing tank. From there, it is drawn out by a high-temperature fan, and the mixture is regulated and controlled to the designed temperature and pressure using a regulating valve. Finally, it is delivered to the "oxygen-deficient zone" of the fluidized bed boiler via an oxygen-enriched preheating and nozzle system, precisely positioned near the coal inlet on the upper side of the combustion air duct. This ensures complete combustion of unburned fly ash and significantly reduces the total combustion air volume, thereby reducing NO₂. X Significant reduction in smoke and dust, etc.

[0083] The connection structure is as follows: the blower 20 is connected to the water cooler 21, the water cooler 21 is connected to the oxygen generator 23, the gas outlet pipeline of the oxygen generator 23 is connected to the oxygen-enriched buffer tank 24, the oxygen-enriched buffer tank 24 is connected to the ejector 25, the outlet of the ejector 25 is connected to the high-temperature blower 26, the outlet of the high-temperature blower 26 is connected to the oxygen-enriched pressure stabilizing tank 15, the oxygen-enriched pressure stabilizing tank 15 is connected to the oxygen-enriched preheating & nozzle system 17, an automatic regulating valve 16 is installed between the oxygen-enriched pressure stabilizing tank 15 and the oxygen-enriched preheating & nozzle system 17, the preheating section and the curved nozzle of the oxygen-enriched preheating & nozzle system 17 are inserted into the furnace wall 18, and finally enter the gas boiler, and are directly delivered to the flame center 19 through the preheating section and outlet of the nozzle.

[0084] The process flow is as follows: Air enters the oxygen production equipment 23 through the blower 20 and water cooler 22. The high-temperature combustion air drawn out by the ejector 25 through the combustion air duct is mixed with the high-concentration oxygen and enters the oxygen-enriched buffer tank 24. It is then drawn out by the high-temperature blower 26 and enters the oxygen-enriched pressure stabilizing tank 15. It passes through the automatic regulating valve 16 and the oxygen-enriched preheating & nozzle system 17, and finally enters the fluidized bed boiler. After passing through the preheating section of the nozzle and the outlet, it is directly delivered to the flame center 19.

[0085] This embodiment is significantly better than Embodiment 6 of CN202111511698.X: (1) This embodiment adds a monitoring and protection system; (2) Since the oxygen content at the furnace outlet is only about 3%, which is 18% lower than that of air, this embodiment uses high-temperature combustion air instead of high-temperature flue gas, resulting in better oxygen enrichment; (3) The oxygen enrichment in this embodiment is not only precisely delivered to the upper side of the upper combustion air duct through oxygen enrichment nozzles (Example 6 of 202111511698.X), but also delivered to the furnace wall near the coal feed port: this significantly reduces the carbon content of fly ash and slag; (4) Fluidized bed boilers are shut down an average of 2-8 times per year, and the VPSA oxygen enrichment concentration can reach up to about 95%, which is very suitable for fluidized bed boiler ignition: it can not only shorten the ignition time, but also significantly reduce the amount of high-quality fuel by 10-30%. After implementing the method provided by this invention, energy saving is generally 2-5%, CO is reduced by 20-60%, and NO... X The load is reduced by 10-30%, the load is increased by 5-20%, the carbon content of fly ash is reduced by 10-25%, the carbon content of slag is reduced by 15-30%, the flue gas temperature and oxygen content are significantly reduced, and the maintenance and overhaul cycle of water-cooled wall tubes and the furnace life are significantly extended.

[0086] Example 3

[0087] This embodiment is used for an integrated system of precise combustion enhancement using industrial byproducts from pulverized coal boilers, employing oxygen enrichment and localized oxygenation.

[0088] Combination Figure 4 The integrated system comprises four parts: an oxygen source, a precision oxygenation and combustion-supporting system, an electronic control system, and a monitoring and protection system.

[0089] In this embodiment, the oxygen source is connected to the precision oxygenation and combustion-supporting system, and the electronic control system is connected to the oxygen source and the monitoring and protection system respectively through cables and control lines.

[0090] In this embodiment, the industrial furnace is a pulverized coal furnace. When using industrial by-product oxygen enrichment as the oxygen source, the precise oxygen-enrichment combustion system is slightly adjusted. The electrical control system and monitoring and protection system are basically the same as in Embodiment 2, and will not be described again. Since the concentration of industrial by-product oxygen enrichment is also relatively high, and the pressure is generally around 1.6 MPa, the processing flow is the same as the first part of the process of VPSA oxygen source. Both involve oxygen enrichment and high-temperature combustion air entering the pressure stabilizing tank through an ejector. The difference is that the high-temperature fan is eliminated, and the air directly enters the oxygen enrichment preheating & nozzle system before entering the boiler.

[0091] The specific process is as follows: high pressure and high concentration of industrial by-product oxygen enrichment enter the precision oxygen-enriched combustion system. The high temperature combustion air drawn out by the gas ejector 25 through the combustion air duct is mixed with the high concentration of oxygen enrichment and enters the oxygen enrichment pressure tank 15. The outlet of the oxygen enrichment pressure tank 15 is connected to the oxygen enrichment preheating & nozzle system 17. The mixed gas enters the pulverized coal furnace through the regulating valve 16 and the nozzle inlet of the oxygen enrichment preheating & nozzle system 17. After passing through the preheating section and outlet of the nozzle, it is directly delivered to the flame center.

[0092] The petrochemical industry produces a significant amount of oxygen-enriched industrial byproducts, which are normally discharged into the atmosphere, polluting the environment and wasting resources. Since this oxygen-enriched air typically operates at a pressure of around 1.6 MPa, an ejector can be used to inject high-temperature combustion air. After the air is pressurized to design parameters by a pressure stabilizing tank, it is delivered to the flame center of the pulverized coal boiler via an oxygen-enriched preheating and nozzle system. This reduces the energy consumption of the high-temperature blower and eliminates the need for maintenance. Implementing the method provided by this invention generally results in energy savings of 2-8%, CO reduction of 20-80%, and NO reduction... X The load is reduced by 10-50%, the load is increased by 5-40%, the carbon content of fly ash is reduced by 5-40%, the carbon content of slag is reduced by 10-50%, the flue gas temperature and oxygen content are significantly reduced, and the maintenance and overhaul cycle of water-cooled wall tubes and the furnace life are significantly extended.

[0093] Example 4

[0094] This embodiment describes a novel membrane-based oxygen-enriched local oxygen-enhancing precision combustion-supporting integrated system for gas-fired heating furnaces.

[0095] Combination Figure 5 The integrated system comprises four parts: an oxygen source, a precision oxygenation and combustion-supporting system, an electronic control system, and a monitoring and protection system.

[0096] In this embodiment, the oxygen source is connected to the precision oxygenation and combustion assist system, and the electrical control system is connected to the oxygen source, the precision oxygenation and combustion assist system, and the monitoring and protection system respectively via cables and control lines.

[0097] In this embodiment, the industrial furnace is a gas-fired heating furnace; the electrical control system and monitoring and protection system are basically the same as in Embodiment 2, and will not be described again.

[0098] As attached Figure 5 As shown, the system connection structure is as follows: the filter is connected to the ventilator, the ventilator is connected to the oxygen-enriched membrane unit, the oxygen-enriched membrane unit is connected to the vacuum booster pump, the vacuum booster pump is connected to the oxygen-enriched preheating & nozzle system, and the oxygen-enriched preheating & nozzle system is connected to the gas-fired heater.

[0099] After being filtered, the air is sent to the ventilation fan for pressurization and then enters the oxygen-enriched membrane unit for separation. The nitrogen-enriched air is discharged, and the oxygen-enriched air is extracted by the vacuum booster pump and pressurized to the design pressure of 2-20 kPa. After passing through the oxygen-enriched preheating & nozzle system, the high-temperature combustion air of the industrial furnace is used to further improve the oxygen-enriched quality before it is sent to the flame center of the gas-fired heating furnace.

[0100] There are many types of gas-fired heating furnaces in industries such as petrochemicals and steel. This example focuses on a gas-fired rolling mill heating furnace in the steel industry. Because the outlet flue gas temperature of this furnace is extremely high, the oxygen-enriched nozzles are designed as an oxygen-enriched preheating & nozzle system. This means that the high-temperature flue gas is first used to preheat the oxygen-enriched gas to a higher temperature, resulting in better energy savings, emission reductions, increased production, and improved efficiency. After implementation, gas consumption is generally reduced by 2-7%, CO is reduced by 20-80%, and NO... X Reduce by 10-50%, increase load by 5-40%, reduce product burn-off rate by 3-20%, and significantly decrease exhaust gas temperature and oxygen content.

[0101] In summary, the localized oxygen-enhanced precision combustion integrated system has a very wide range of applications and is suitable for all industrial furnaces and kilns. It can significantly save energy, improve product quality and output, extend furnace life, and reduce smoke, dust, CO, CO2, and NO. X It has significant comprehensive benefits such as energy conservation, emission reduction, increased production and improved efficiency.

[0102] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A localized oxygen-enhancing precision combustion-supporting integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement in industrial furnaces and kilns, characterized in that: The system includes an oxygen source, a precise oxygen-enrichment combustion system, an electrical control system, and a monitoring and protection system. The oxygen source and the precise oxygen-enrichment combustion system are connected. The electrical control system is connected to the oxygen source, the precise oxygen-enrichment combustion system, and the monitoring and protection system via cables and control lines. The monitoring and protection system is connected to the precise oxygen-enrichment combustion system for real-time monitoring. The precise oxygen-enrichment combustion system includes a pressure stabilization system and an oxygen-enriched preheating and nozzle system. The oxygen source is a membrane oxygen generator. A filter, a fan, an oxygen-enriched membrane unit, a vacuum booster pump, an oxygen-enriched pressure stabilizing tank, and the oxygen-enriched preheating and nozzle system are connected sequentially. The oxygen-enriched preheating and nozzle system is inserted into the furnace wall of the industrial furnace to precisely deliver oxygen into the flame. The oxygen-enriched membrane unit adopts a plate-type oxygen-enriched component. The oxygen-enriched preheating and nozzle system is a device with a curved nozzle, which includes an integrated structure consisting of an outer connecting rod (A), a preheating section (B), and a bent nozzle (C). The outer connecting rod (A) is columnar, and the inner connecting rod (B) is a cuboid with a base. The bent nozzle (C) is composed of an outlet end (C1) with a parallelogram cross-section and a bent part (C2) with a rectangular cross-section. The outlet end (C1) with a parallelogram cross-section and the bent part (C2) with a rectangular cross-section form a certain angle in the horizontal and / or vertical directions, with an angle range of ±85°.

2. The integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement of industrial furnaces and kilns, characterized in that, The oxygen-enriched preheating and nozzle system has an external connecting rod (A) placed outside the furnace wall (18) and connected to the pressure stabilizing system, a preheating section (B) placed inside the furnace wall (18) with a length equal to the thickness of the furnace wall, and an elbow nozzle (C) inserted into the furnace wall (18) for 10mm to 500mm.

3. A localized oxygen-enhancing precision combustion-supporting integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement in industrial furnaces and kilns, characterized in that: The system includes an oxygen source, a precise oxygenation and combustion assist system, an electrical control system, and a monitoring and protection system. The oxygen source and the precise oxygenation and combustion assist system are connected. The electrical control system is connected to the oxygen source, the precise oxygenation and combustion assist system, and the monitoring and protection system via cables and control lines. The monitoring and protection system is connected to the precise oxygenation and combustion assist system for real-time monitoring. The precise oxygenation and combustion assist system includes a pressure stabilization system and an oxygen-enriched preheating and nozzle system. The oxygen source is a VPSA (Polyoxymethylene Sulfate). The oxygen generator, oxygen-enriched buffer tank, ejector, high-temperature fan, oxygen-enriched pressure stabilizing tank, and oxygen-enriched preheating and nozzle system are connected sequentially. The ejector is also connected to the combustion assist duct. The oxygen-enriched preheating and nozzle system is inserted into the industrial... The furnace wall precisely delivers oxygen to the center of the flame. The oxygen-enriched preheating and nozzle system is a device with a curved nozzle, which is an integrated structure consisting of an outer connecting rod (A), a preheating section (B), and a bent nozzle (C). The outer connecting rod (A) is columnar, and the inner connecting rod (B) is a cuboid with a base. The bent nozzle (C) is composed of an outlet end (C1) with a parallelogram cross-section and a bent part (C2) with a rectangular cross-section. The outlet end (C1) with a parallelogram cross-section and the bent part (C2) with a rectangular cross-section form a certain angle in the horizontal and / or vertical directions, with an angle range of ±85°.

4. The integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement of industrial furnaces and kilns, characterized in that, The oxygen-enriched preheating and nozzle system has an external connecting rod (A) placed outside the furnace wall (18) and connected to the pressure stabilizing system, a preheating section (B) placed inside the furnace wall (18) with a length equal to the thickness of the furnace wall, and an elbow nozzle (C) inserted into the furnace wall (18) for 10mm to 500mm.

5. An integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement in industrial furnaces and kilns, characterized in that: The system includes an oxygen source, a precise oxygen-enrichment combustion system, an electrical control system, and a monitoring and protection system. The oxygen source and the precise oxygen-enrichment combustion system are connected. The electrical control system is connected to the oxygen source, the precise oxygen-enrichment combustion system, and the monitoring and protection system via cables and control lines. The monitoring and protection system is connected to the precise oxygen-enrichment combustion system for real-time monitoring. The precise oxygen-enrichment combustion system includes a pressure stabilization system and an oxygen-enriched preheating and nozzle system. The oxygen source is industrial byproduct oxygen enrichment. The oxygen generator, oxygen-enriched buffer tank, ejector, oxygen-enriched pressure stabilizing tank, and oxygen-enriched preheating and nozzle system are connected sequentially. The ejector is also connected to the combustion air duct. The oxygen-enriched preheating and nozzle system is inserted into the industrial furnace. The kiln wall precisely delivers oxygen to the center of the flame. The oxygen-enriched preheating and nozzle system is a device with a curved nozzle, which is an integrated structure consisting of an outer connecting rod (A), a preheating section (B), and a bent nozzle (C). The outer connecting rod (A) is columnar, and the inner connecting rod (B) is a cuboid with a base. The bent nozzle (C) is composed of an outlet end (C1) with a parallelogram cross-section and a bent part (C2) with a rectangular cross-section. The outlet end (C1) with a parallelogram cross-section and the bent part (C2) with a rectangular cross-section form a certain angle in the horizontal and / or vertical directions, with an angle range of ±85°.

6. The integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement of industrial furnaces and kilns, characterized in that, The oxygen-enriched preheating and nozzle system has an external connecting rod (A) placed outside the furnace wall (18) and connected to the pressure stabilizing system, a preheating section (B) placed inside the furnace wall (18) with a length equal to the thickness of the furnace wall, and an elbow nozzle (C) inserted into the furnace wall (18) for 10mm to 500mm.

7. The precision combustion method using the integrated system for comprehensive energy saving, emission reduction, production increase, and efficiency improvement of industrial furnaces and kilns with localized oxygen enhancement and precision combustion as described in claim 3, characterized in that... Includes the following steps: S1. The electrical control system is activated, turning on the VPSA oxygen source, the precision oxygen-enriched combustion system, and the monitoring and protection system, and using high-concentration oxygen enrichment to ignite the industrial furnace. S2. After the industrial furnace system is in normal operation, the high-temperature secondary air and high-concentration oxygen in the industrial furnace are mixed and precisely delivered to the flame center of the industrial furnace through the ejector and high-temperature and high-pressure fan using the oxygen preheating & nozzle system; the oxygen enrichment pressure and temperature remain stable, with the oxygen enrichment outlet pressure at 2kPa-100kPa, the oxygen enrichment temperature at 100℃-500℃, and the oxygen enrichment concentration at 25%-65%.

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