Flue gas recycling system of oxygen-enriched side-blown converter

Abstract

The utility model relates to the technical field of smelting equipment, in particular to an oxygen-enriched side-blown converter flue gas recycling system which comprises a main furnace body, a heat exchange device, a power generation device and an electrolysis device. The heat exchange device and the flue are communicated with each other to collect and exchange heat energy, the power generation device and the heat exchange device are communicated with each other to convert the heat energy into electric energy, and the electrolysis device and the power generation device are communicated with each other to electrolyze water to generate oxygen; a side air inlet pipe used for assisting oxygen-enriched combustion is arranged on the side wall of the main furnace body, the side air inlet pipe is communicated with the interior of the main furnace body, an oxygen conveying pipe is arranged on the electrolysis device, and the oxygen conveying pipe is communicated with the side air inlet pipe. The method has the effect of improving the situation that available resources in the flue gas of the oxygen-enriched side-blown converter are wasted.

Description

Technical Field

[0001] The present application relates to the technical field of smelting equipment, and in particular to a flue gas recycling system for an oxygen-enriched side-blown furnace. Background Art

[0002] The oxygen-enriched side-blown furnace is a high-temperature industrial furnace, mainly used in the smelting production process. The oxygen-enriched side-blown furnace has tuyere at different levels on both sides of the furnace body, which is used to blow oxygen-enriched air into the molten slag layer. The oxygen-enriched combustion technology allows the combustible components in the flue gas to be fully burned, thereby improving the smelting efficiency.

[0003] During the material incineration process, the oxygen-enriched side-blown furnace will produce flue gas containing toxic and harmful gases such as carbon monoxide. The direct emission of flue gas will seriously pollute the atmospheric environment. In the related technology, in order to protect the environment, the flue gas is usually secondary incinerated before being discharged, but this treatment method not only increases the treatment cost but also does not effectively utilize the heat energy carried by the flue gas, resulting in a waste of resources. Utility Model Content

[0004] In order to improve the situation where available resources in the flue gas of an oxygen-enriched side-blown furnace are wasted, the present application provides an oxygen-enriched side-blown furnace flue gas recycling system.

[0005] The present application provides an oxygen-enriched side-blown furnace flue gas recycling system, which adopts the following technical solutions:

[0006] An oxygen-enriched side-blown furnace flue gas recycling system comprises a main furnace body, a heat exchange device, a power generation device and an electrolysis device, wherein the upper portion of the main furnace body is provided with a flue for exhausting gas, the heat exchange device and the flue are interconnected to collect and exchange heat energy, the power generation device and the heat exchange device are interconnected to convert heat energy into electrical energy, and the electrolysis device and the power generation device are interconnected to electrolyze water to produce oxygen;

[0007] A side air intake pipe for assisting oxygen-rich combustion is arranged on the side wall of the main furnace body, and the side air intake pipe is interconnected with the interior of the main furnace body. An oxygen supply pipe is arranged on the electrolysis device, and the oxygen supply pipe is interconnected with the side air intake pipe.

[0008] By adopting the above technical solution, the heat exchange device can collect the heat energy carried by the gas discharged from the flue of the main furnace body and exchange and utilize it. The heat recovery mechanism reduces energy waste and improves the energy utilization efficiency of the entire system. The power generation device converts the heat energy collected by the heat exchange device into electrical energy, provides power support for the electrolysis device, and realizes multi-level utilization of energy. The electrolysis device uses the electricity provided by the power generation device to electrolyze water into oxygen and hydrogen. Since the electrolysis process directly depends on the electricity generated inside the system, no additional electricity input is required, thereby reducing production costs. The electrolysis device is connected to the oxygen supply pipe, and the produced oxygen can be directly returned to the side air intake pipe of the main furnace body to provide an oxygen source for oxygen-enriched combustion and realize the enhancement of oxygen-enriched combustion. Oxygen-enriched combustion can improve combustion efficiency, reduce fuel consumption, and reduce the generation of harmful substances in flue gas, which is beneficial to environmental protection. The entire system forms an efficient and coordinated closed loop from heat energy collection, power generation, oxygen preparation to the enhancement of oxygen-enriched combustion. Each link cooperates with each other to jointly improve the waste of available resources in the flue gas of the oxygen-enriched side-blown furnace, realize efficient energy utilization, and improve environmental protection benefits.

[0009] Furthermore, a steam replenishing device is provided on a side of the heat exchange device away from the main furnace body, and the steam replenishing device is communicated with the heat exchange device.

[0010] By adopting the above technical solution, the flue gas discharged from the main furnace may fluctuate due to process changes, resulting in unstable thermal energy in the heat exchange device. The steam replenishment device can serve as a thermal energy buffer mechanism to balance and stabilize the thermal energy in the heat exchange device, thereby improving the operating stability of the entire system. The steam replenishment device can provide additional steam to the heat exchange device, thereby achieving the regulation and optimization of thermal energy during the heat exchange process. According to actual needs, by adjusting the amount of steam replenishment, the temperature and heat distribution in the heat exchange device can be accurately controlled, further improving the thermal energy utilization efficiency.

[0011] Furthermore, the steam replenishing device is provided with a negative pressure vacuum pump for reducing the air pressure in the tank.

[0012] By adopting the above technical solution, the negative pressure vacuum pump can form a low-pressure environment inside the steam replenishment device, thereby reducing the boiling point of the liquid, increasing the steam output under the premise of equal energy consumption, meeting the steam demand of the heat exchange device, and improving the operating efficiency of the entire system. At the same time, by accurately controlling the air pressure in the tank, the negative pressure vacuum pump can reduce the leakage and waste of steam, reduce the energy consumption of the system, and also help reduce the potential impact on the environment.

[0013] Furthermore, the electrolysis device is provided with a separation mechanism for separating hydrogen and oxygen, and the oxygen supply pipe is connected to the separation mechanism to return oxygen to the side air inlet pipe.

[0014] By adopting the above technical solution, the separation mechanism can efficiently separate the hydrogen and oxygen produced by electrolysis, ensure the purity of oxygen, meet the oxygen quality requirements of oxygen-enriched combustion, and also avoid safety accidents such as explosions that may occur when hydrogen and oxygen are mixed, thereby reducing potential safety risks. The separation mechanism is connected to the oxygen supply pipe so that the separated oxygen can be directly returned to the side air intake pipe, thereby realizing the recycling of oxygen, reducing oxygen waste, reducing production costs, and improving the energy efficiency of the entire system. At the same time, returning oxygen directly to the side air intake pipe also reduces the risk of oxygen leakage during transportation, further enhancing the safety of the system and helping to improve the overall performance of the system.

[0015] Furthermore, the separation mechanism is also provided with a guide tube for collecting hydrogen, and one end of the guide tube away from the electrolysis device is connected to a clean energy storage tank.

[0016] By adopting the above technical solution, the guide tube collects the hydrogen produced during the electrolysis process. The only product produced by hydrogen combustion is water. As a clean energy source, it is more environmentally friendly than traditional fossil fuels and has broad application prospects. The collected hydrogen is transported to the clean energy storage tank for storage, which provides a stable source of hydrogen for subsequent applications. By collecting and utilizing the hydrogen produced by electrolysis, energy utilization can be diversified, and energy utilization efficiency and economic benefits can be further improved. Incorporating the collection, storage and utilization of hydrogen into the entire oxygen-enriched side-blown furnace flue gas recycling system makes the system more complete and efficient, which helps to achieve the comprehensive utilization and recycling of energy and improve the energy efficiency of the entire system.

[0017] Furthermore, a first material tray and a second material tray in the shape of a hollow grid are provided in the main furnace body. Both the first material tray and the second material tray can be detachably connected to the inner wall of the main furnace body. The grid gaps of the first material tray are larger than the grid gaps of the second material tray. The first material tray is located on a side of the second material tray close to the flue and is parallel to the second material tray.

[0018] By adopting the above technical solution, the first material tray is located on the side of the second material tray close to the flue, the grid gaps of the first material tray are relatively large, and the material undergoes the first stage of oxygen-enriched combustion when the particles are relatively large. The particle size of the melted material is reduced and falls from the first material tray to the second material tray. The grid gaps of the second material tray are relatively small, and can receive the fine particles of the material, so that the material undergoes the second stage of oxygen-enriched combustion. Such a setting can optimize the distribution and reaction process of the material in the main furnace body, better utilize the thermal energy inside the main furnace body, reduce heat loss, help the material to better exchange heat, react or melt, improve processing efficiency and product quality, increase the flexibility of the system in smelting materials, and improve the energy utilization efficiency of the entire system.

[0019] Furthermore, the side air inlet pipe includes a first air inlet pipe and a second air inlet pipe, the first air inlet pipe is located on the side wall of the main furnace body above the first material tray, and the second air inlet pipe is located on the side wall of the main furnace body between the first material tray and the second material tray, and the first air inlet pipe and the second air inlet pipe are both circumferentially arranged on the main furnace body.

[0020] By adopting the above technical solution, the first air inlet pipe is located above the first material tray, and the second air inlet pipe is located between the first material tray and the second material tray. By setting two groups of air inlet pipes in different positions, the stratified and zoned supply of oxygen can be achieved, which helps to optimize the combustion process in the furnace, making the combustion more uniform and sufficient, thereby improving the combustion efficiency and thermal efficiency. The positions of the first air inlet pipe and the second air inlet pipe are coordinated with the layout of the material tray, and oxygen can act more directly on materials at different levels, which helps to improve the melting, reaction or pyrolysis of the materials and improve the product quality and uniformity. The circumferential air inlet pipe layout allows oxygen to be supplied through multiple air inlet pipes, reducing the risk of single point failures and improving the stability of the entire system.

[0021] Furthermore, a plurality of jet valves are arranged on the inner wall of the main furnace body, and each of the jet valves is arranged at a port position of each of the first air inlet pipe and the second air inlet pipe in a one-to-one correspondence, and each of the jet valves is communicated with each of the side air inlet pipes.

[0022] By adopting the above technical solution, by setting a plurality of jet valves and correspondingly connecting them with the air inlet pipes, it is helpful to avoid the situation of local oxygen excess or deficiency, thereby improving the combustion efficiency and material processing quality. Since each jet valve can be independently controlled, the oxygen supply can be flexibly adjusted according to actual needs. For materials that require higher temperature or more complete oxidation, the oxygen supply of the jet valve at the corresponding position can be increased, and for materials that require lower temperature or less oxidation, the oxygen supply can be reduced. Flexible control helps to achieve more refined material processing and improve product quality and uniformity.

[0023] Furthermore, each of the gas injection valves is arranged at an end away from the inner wall of the main furnace body and tilted downward.

[0024] By adopting the above technical solution, the outlet end of the gas injection valve is tilted downward, so that the ejected oxygen can enter the main furnace body at a certain angle, which helps the oxygen to better penetrate the material layer, increase the contact area and mixing effect between oxygen and material, and promote the combustion or oxidation reaction. The tilted downward oxygen injection helps to form a more stable hot air flow field in the main furnace body, reduce heat convection and loss. This helps to maintain a stable temperature in the main furnace body, improve thermal efficiency, and reduce energy consumption.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The flue gas recycling system of the oxygen-enriched side-blown furnace realizes the recycling of flue gas heat energy. The heat energy in the flue gas discharged from the main furnace is collected and converted into electrical energy through the heat exchange device, and further oxygen is produced through the electrolysis device for oxygen-enriched combustion, forming a closed energy cycle. This not only improves energy utilization efficiency, reduces energy consumption, but also reduces environmental pollution;

[0027] 2. By setting the first material tray and the second material tray with different grid gaps, as well as the layered side air inlet pipe and the jet valve, uniform oxygen-enriched combustion and refined treatment of the material are achieved, the combustion efficiency and material processing quality are improved, the system can adapt to various process requirements, and the quality and uniformity of the product are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of an oxygen-enriched side-blown furnace flue gas recycling system according to an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the main furnace body in the embodiment of the present application.

[0030] Explanation of the reference numerals: 1. Main furnace body; 11. Flue; 12. Side air inlet pipe; 121. First air inlet pipe; 122. Second air inlet pipe; 13. First material tray; 14. Second material tray; 15. Jet valve; 16. Slag outlet; 2. Heat exchange device; 3. Power generation device; 4. Electrolysis device; 41. Separation mechanism; 411. Oxygen supply pipe; 412. Guide pipe; 413. Clean energy storage tank; 5. Steam replenishing device; 51. Negative pressure vacuum pump. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-2 And embodiments, the present application is further described in detail.

[0032] The present application embodiment discloses an oxygen-enriched side-blown furnace flue gas recycling system. Figure 1 The oxygen-enriched side-blown furnace flue gas recycling system includes a main furnace body 1, a heat exchange device 2, a power generation device 3, an electrolysis device 4 and a steam supplement device 5.

[0033] The main furnace body 1 in the embodiment of the present application is an oxygen-enriched side-blown furnace. Figure 2 A flue 11 is arranged above the main furnace body 1 , and the flue 11 can be used to discharge the smoke generated inside the main furnace body 1 . A slag outlet 16 for discharging slag is arranged below the main furnace body 1 .

[0034] A first material tray 13 and a second material tray 14 for supporting materials are arranged in the main furnace body 1 . The first material tray 13 and the second material tray 14 are arranged parallel to each other and are detachably connected to the inner wall of the main furnace body 1 .

[0035] The first tray 13 and the second tray 14 are preferably circular plates with grid-like gaps. The grid gaps on the first tray 13 are larger than the grid gaps on the second tray 14. The particle size of the material gradually decreases during the process of forming a molten state. The material falls from the first tray 13 and is received by the second tray 14, thereby achieving the effect of stratified oxygen-enriched combustion.

[0036] A side air inlet pipe 12 is vertically arranged on the side wall of the main furnace body 1, and the side air inlet pipe 12 is interconnected with the inside of the main furnace body 1. The side air inlet pipe 12 includes a first air inlet pipe 121 and a second air inlet pipe 122. The number of the first air inlet pipe 121 and the second air inlet pipe 122 are both multiple. The first air inlet pipe 121 is evenly circumferentially arranged on the outer wall of the main furnace body 1 above the first material tray 13, and the second air inlet pipe 122 is evenly circumferentially arranged on the outer wall of the main furnace body 1 between the first material tray 13 and the second material tray 14.

[0037] Each first air inlet pipe 121 and each second air inlet pipe 122 is provided with an air jet valve 15 at the port position inside the main furnace body 1. Each air jet valve 15 is connected to each side air inlet pipe 12. The air jet valve 15 can control the on-off of the gas and the inside of the furnace body and the air intake amount. Each air jet valve 15 can be independently controlled. Each air jet valve 15 is arranged to be tilted downward. The air jet valve 15 connected to the first air inlet pipe 121 is away from the end connected to the inner wall of the main furnace body 1 and faces the first material tray 13. The air jet valve 15 connected to the second air inlet pipe 122 is away from the end connected to the inner wall of the main furnace body 1 and faces the second material tray 14.

[0038] Reference Figure 1 The heat exchange device 2 of this embodiment is preferably a fin-type steam heat exchanger with excellent heat transfer performance. The heat exchange device 2 is interconnected with the flue 11 of the main furnace body 1, so as to collect the heat energy in the flue gas.

[0039] The steam replenishing device 5 is arranged between the main furnace body 1 and the heat exchange device 2. The steam replenishing device 5 can preferably be an industrial boiler. The steam replenishing device 5 evaporates water under heating conditions and produces steam. The water vapor produced by the steam replenishing device 5 can replenish steam when the thermal energy is insufficient to ensure the stable heat exchange.

[0040] A negative pressure vacuum pump 51 is provided on the tank body of the steam replenishing device 5. The negative pressure vacuum pump 51 can create a low-pressure environment inside the steam replenishing device 5, thereby reducing the boiling point of water, increasing the steam output under the premise of the same energy consumption, meeting the steam demand of the heat exchange device 2, and improving the operating efficiency of the entire system.

[0041] A power generation device 3 is provided on the side of the heat exchange device 2 away from the main furnace body 1 and the steam supplement device 5. The power generation device 3 in this embodiment is preferably an organic Rankine cycle power generation device 3. The organic Rankine cycle power generation device 3 can utilize the medium and low temperature waste heat generated by the heat exchange device 2 to generate steam at a lower temperature, thereby driving the turbine to generate electricity.

[0042] The power generation device 3 is connected to an electrolysis device 4 on the side away from the heat exchange device 2 . The electrolysis device 4 produces oxygen and hydrogen by electrolyzing water. The electric energy generated by the organic Rankine cycle power generation device 3 is sufficient and stable to supply electricity to the electrolysis device 4 .

[0043] The electrolysis device 4 is provided with a separation mechanism 41, and the hydrogen and oxygen produced by electrolysis are separated through the separation mechanism 41. The separation mechanism 41 is provided with an oxygen supply pipe 411, and one end of the oxygen supply pipe 411 away from the separation mechanism 41 is connected to the side air inlet pipe 12 of the main furnace body 1. The oxygen produced by electrolysis is returned to the main furnace body 1 through the oxygen supply pipe 411 for oxygen-enriched combustion of the material.

[0044] A guide pipe 412 is also provided on the separation mechanism 41 . One end of the guide pipe 412 away from the separation mechanism 41 is connected to a clean energy storage tank 413 . The hydrogen produced by electrolysis is transported into the clean energy storage tank 413 through the guide pipe 412 .

[0045] The implementation principle of the flue gas recycling system of an oxygen-enriched side-blown furnace in the embodiment of the present application is as follows: the main furnace body 1 is the core part of the system, and oxygen-enriched air is introduced through the side air inlet pipe 12 to provide oxygen for oxygen-enriched combustion for the materials in the furnace. The first material tray 13 and the second material tray 14 arranged in the main furnace body 1 can realize the layered processing of materials of different particle sizes according to the different grid gaps, and optimize the material melting process. After the flue gas is discharged from the flue 11, it enters the heat exchange device 2 for heat energy collection. The heat exchange device 2 uses the principle of heat conduction to transfer the heat energy of the flue gas to the working medium, thereby realizing heat energy recovery. The recovered heat energy is converted into electrical energy by the power generation device 3 and supplied to the electrolysis device 4 for water electrolysis to generate oxygen and hydrogen. The generated oxygen is returned to the side air inlet pipe 12 through the oxygen supply pipe 411 to realize the recycling of oxygen. The steam supplement device 5 equipped with the heat exchange device 2 supplements steam when the heat energy is insufficient to ensure the stable heat exchange. The hydrogen generated in the electrolysis device 4 can be collected through the guide pipe 412 and stored in the clean energy storage tank 413. The oxygen-enriched side-blown furnace flue gas recycling system of this solution realizes the recycling of flue gas and the comprehensive utilization of energy through the mutual cooperation of multiple links such as oxygen-enriched combustion, heat recovery, power generation, electrolysis and clean energy utilization.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oxygen-enriched side-blown furnace flue gas recycling system, characterized in that: The invention comprises a main furnace body (1), a heat exchange device (2), a power generation device (3) and an electrolysis device (4); the upper part of the main furnace body (1) is provided with a flue (11) for exhausting gas; the heat exchange device (2) and the flue (11) are interconnected to collect and exchange heat energy; the power generation device (3) and the heat exchange device (2) are interconnected to convert heat energy into electric energy; and the electrolysis device (4) and the power generation device (3) are interconnected to electrolyze water to produce oxygen; A side air intake pipe (12) for assisting oxygen-enriched combustion is provided on the side wall of the main furnace body (1), and the side air intake pipe (12) is interconnected with the interior of the main furnace body (1). An oxygen supply pipe (411) is provided on the electrolysis device (4), and the oxygen supply pipe (411) is interconnected with the side air intake pipe (12).

2. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 1, characterized in that: A steam replenishing device (5) is provided on the side of the heat exchange device (2) away from the main furnace body (1), and the steam replenishing device (5) and the heat exchange device (2) are communicated with each other.

3. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 2 is characterized in that: The steam replenishing device (5) is provided with a negative pressure vacuum pump (51) for reducing the air pressure in the tank.

4. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 1, characterized in that: The electrolysis device (4) is provided with a separation mechanism (41) for separating hydrogen and oxygen, and the oxygen supply pipe (411) is connected to the separation mechanism (41) to return oxygen to the side air intake pipe (12).

5. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 4, characterized in that: The separation mechanism (41) is also provided with a guide pipe (412) for collecting hydrogen, and one end of the guide pipe (412) away from the electrolysis device (4) is connected to a clean energy storage tank (413).

6. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 1, characterized in that: A first material tray (13) and a second material tray (14) in the form of a hollow grid are arranged in the main furnace body (1); the first material tray (13) and the second material tray (14) are both detachably connected to the inner wall of the main furnace body (1); the grid gaps of the first material tray (13) are larger than the grid gaps of the second material tray (14); the first material tray (13) is located on a side of the second material tray (14) close to the flue (11) and is parallel to the second material tray (14).

7. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 6, characterized in that: The side air inlet pipe (12) comprises a first air inlet pipe (121) and a second air inlet pipe (122); the first air inlet pipe (121) is located on the side wall of the main furnace body (1) above the first material tray (13); the second air inlet pipe (122) is located on the side wall of the main furnace body (1) between the first material tray (13) and the second material tray (14); the first air inlet pipe (121) and the second air inlet pipe (122) are both circumferentially arranged on the main furnace body (1).

8. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 7, characterized in that: A plurality of jet valves (15) are arranged on the inner wall of the main furnace body (1), and each of the jet valves (15) is arranged correspondingly at the port position of each of the first air intake pipes (121) and the second air intake pipes (122), and each of the jet valves (15) and each of the side air intake pipes (12) are connected to each other.

9. The oxygen-enriched side-blown furnace flue gas recycling system according to claim 8, characterized in that: The end of each of the gas injection valves (15) away from the inner wall of the main furnace body (1) is arranged to be inclined downward.

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