Metallurgical arc furnace off-gas multi-line parallel processing system

Abstract

This utility model discloses a multi-line parallel treatment system for metallurgical submerged arc furnace gas, including a direct gas transmission pipeline and multiple metallurgical submerged arc furnace gas purification pipelines connected in parallel to the direct gas transmission pipeline. Each metallurgical submerged arc furnace gas purification pipeline includes a first cooler, a pre-dust collector, a high-temperature flue gas filter, and a fan arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The inlet of the first cooler in the direct gas transmission pipeline is connected to the outlet of the metallurgical submerged arc furnace gas, and the outlet of the fan in the direct gas transmission pipeline is connected to the direct gas transmission pipeline via corresponding valves. Furthermore, each metallurgical submerged arc furnace gas purification pipeline is configured to ensure that the temperature of the metallurgical submerged arc furnace gas at the outlet of the fan is ≥250℃. The direct gas transmission pipeline is used to directly input the metallurgical submerged arc furnace gas into the gas application point, improving energy utilization and reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of submerged arc furnace gas treatment technology, specifically to a multi-line parallel treatment system for metallurgical submerged arc furnace gas, which is particularly suitable for the purification and energy utilization of high-temperature furnace gas generated in submerged arc furnace smelting processes such as high-carbon ferrochrome, silicon-manganese alloy, ferromanganese alloy, high-titanium slag, ferrovanadium, ferrotungsten, ferromolybdenum, ferrotitanium, and calcium carbide. Background Technology

[0002] Metallurgical submerged arc furnaces are crucial equipment for smelting high-carbon ferrochrome, ferrosilicon-manganese alloys, ferromanganese alloys, high-titanium slag, ferrovanadium, ferrotungsten, ferromolybdenum, ferrotitanium, calcium carbide, and other products. During the smelting process, metallurgical submerged arc furnaces (usually closed-loop furnaces) generate large quantities of high-temperature furnace gas (also known as coal gas). This gas typically ranges in temperature from 600℃ to 1200℃ and contains significant amounts of dust, CO gas, and other impurities. Traditional metallurgical submerged arc furnace gas treatment systems employ a single-line process. The high-temperature furnace gas is gradually cooled through multi-stage coolers, then purified by a bag filter, and finally stored in a gas holder (the inlet temperature of which typically does not exceed 50℃). Finally, it is delivered to the point of use for combustion via a gas pipeline network. This treatment method has several significant drawbacks: First, the temperature drop during the treatment process is substantial, resulting in a large loss of sensible heat energy and reducing energy utilization efficiency. Secondly, large gas holders need to be built as intermediate storage devices, which not only increases the complexity of the system but also greatly increases the initial investment cost; gas holders store large amounts of CO, which poses safety risks such as leakage and explosion.

[0003] Currently, there are some improvement solutions in the industry, such as adding waste heat boilers to recover heat energy and improving dust removal equipment. However, these improvement measures often only optimize a certain part of the metallurgical submerged arc furnace gas treatment system and fail to solve the above problems as a whole. Utility Model Content

[0004] The purpose of this invention is to provide a multi-line parallel treatment system for furnace gas in metallurgical submerged arc furnaces. Through the design of multiple parallel purification pipelines, it achieves controlled cooling and efficient purification of furnace gas, while eliminating the need for an intermediate gas holder and directly delivering the high-temperature purified furnace gas to the gas application point, thus significantly improving energy utilization efficiency.

[0005] This utility model discloses a multi-line parallel treatment system for metallurgical submerged arc furnace gas, comprising a direct gas transmission pipeline and multiple metallurgical submerged arc furnace gas purification pipelines connected in parallel to the direct gas transmission pipeline. Each metallurgical submerged arc furnace gas purification pipeline includes a first cooler, a pre-dust collector, a high-temperature flue gas filter, and a fan arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The inlet of the first cooler is connected to the metallurgical submerged arc furnace gas outlet, and the outlet of the fan is connected to the outlet of the gas filter via corresponding valves. The gas is directly transported through pipelines, and each metallurgical submerged arc furnace gas purification pipeline is configured to controllably and gradually decrease the temperature of the metallurgical submerged arc furnace gas during its flow, so that the temperature of the metallurgical submerged arc furnace gas at the outlet of the blower is ≥250℃. The gas is directly transported through pipelines to directly input the metallurgical submerged arc furnace gas output from these purification pipelines into the gas application point, so that the gas application point can achieve dual utilization of the gas composition and the heat energy carried by the metallurgical submerged arc furnace gas.

[0006] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the first cooler adopts a water-cooled flue.

[0007] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the pre-dust collector adopts a water-cooled gravity dust collector.

[0008] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the high-temperature flue gas filter uses a metal filter element or a ceramic filter element as the filter element.

[0009] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel treatment system, further: each metallurgical submerged arc furnace gas purification pipeline also includes a second cooler installed between the corresponding high-temperature flue gas filter and the corresponding fan, the second cooler being configured with an outlet temperature of 300°C or higher.

[0010] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the second cooler adopts an air cooler or an air cooler.

[0011] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the first cooler is configured with an outlet temperature of above 450°C, the pre-dust collector is configured with an outlet temperature of above 400°C, and the high-temperature flue gas filter is configured with an outlet temperature of above 350°C.

[0012] As an optimization and / or instantiation of the above-mentioned multi-line parallel treatment system for metallurgical submerged arc furnace gas, further: each metallurgical submerged arc furnace gas purification pipeline also includes a third cooler installed between the corresponding fan and the corresponding valve, wherein the temperature of the metallurgical submerged arc furnace gas at the outlet of the third cooler is ≥250℃.

[0013] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the third cooler is a water cooler or an air cooler.

[0014] As an optimization and / or instantiation of the above-mentioned metallurgical submerged arc furnace gas multi-line parallel processing system, further: the temperature of the metallurgical submerged arc furnace gas at the outlet of the blower is 300℃-400℃.

[0015] This utility model's multi-line parallel processing system for metallurgical submerged arc furnace gas achieves flexible switching and coordinated operation of multiple processing lines by setting up a direct gas delivery pipeline and multiple parallel metallurgical submerged arc furnace gas purification pipelines. Each metallurgical submerged arc furnace gas purification pipeline's primary cooler, pre-dust collector, high-temperature flue gas filter, and fan controllably and gradually cools the metallurgical submerged arc furnace gas according to a preset cooling gradient, ensuring that the metallurgical submerged arc furnace gas temperature at the fan outlet is ≥250℃, effectively preserving the thermal energy of the metallurgical submerged arc furnace gas. This multi-line parallel processing system eliminates the need for a gas holder in traditional processes, directly delivering the high-temperature purified metallurgical submerged arc furnace gas to the gas application point via the direct gas delivery pipeline. This allows the gas application point to achieve dual utilization of the gas composition and the carried thermal energy of the metallurgical submerged arc furnace gas, significantly improving energy efficiency and reducing investment and operating costs by eliminating the need for a gas holder. Meanwhile, the parallel design of multiple metallurgical submerged arc furnace gas purification pipelines enhances the reliability and flexibility of the multi-line parallel processing system for metallurgical submerged arc furnace gas. The gas processing capacity can be flexibly adjusted according to the actual production needs of the metallurgical submerged arc furnace, adapting to different operating conditions. Most importantly, the multi-line parallel design effectively solves the gas volume fluctuation problem caused by material input and output from a single submerged arc furnace. Through the gas volume balancing effect of multiple purification pipelines, the total gas volume delivered to the gas application point remains relatively stable, providing a stable and reliable gas supply for downstream applications and significantly improving the operational stability of the entire system and the continuity of downstream processes. Whether using the high-temperature furnace gas for heat recovery at combustion points or as a chemical raw material at high-temperature chemical synthesis points, this invention provides an innovative solution for the efficient and diversified utilization of metallurgical submerged arc furnace gas. The stable gas volume control achieved through multi-line parallel connection is particularly important for high-temperature chemical synthesis requiring a stable gas source, greatly improving the product quality and production efficiency of downstream processes.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a multi-line parallel processing system for furnace gas in a metallurgical submerged arc furnace according to Embodiment 1 of this utility model.

[0018] Figure 2 This is a schematic diagram of a multi-line parallel processing system for furnace gas in a metallurgical submerged arc furnace according to Embodiment 2 of this utility model.

[0019] The following are marked in the diagram: Gas direct combustion transmission pipeline 1, First cooler 2-1, First cooler 2-2, Pre-dust collector 3-1, Pre-dust collector 3-2, High-temperature flue gas filter 4-1, High-temperature flue gas filter 4-2, Second cooler 5-1, Second cooler 5-2, Fan 6-1, Fan 6-2, First metallurgical submersible furnace 7-1, Second metallurgical submersible furnace 7-2, Valve 8-1, Valve 8-2, Third cooler 9-1, Third cooler 9-2. Detailed Implementation

[0020] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0021] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0022] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0023] The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0024] Example 1

[0025] like Figure 1As shown, the metallurgical submerged arc furnace gas multi-line parallel processing system of this embodiment includes a direct gas transmission pipeline 1 and multiple metallurgical submerged arc furnace gas purification pipelines connected in parallel to the direct gas transmission pipeline 1. In this embodiment, two metallurgical submerged arc furnace gas purification pipelines are provided, namely the first metallurgical submerged arc furnace gas purification pipeline and the second metallurgical submerged arc furnace gas purification pipeline.

[0026] The first metallurgical submerged arc furnace gas purification pipeline includes a first cooler 2-1, a pre-dust collector 3-1, a high-temperature flue gas filter 4-1, a second cooler 5-1, and a fan 6-1 arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The first cooler 2-1 uses a water-cooled flue, with its inlet connected to the gas outlet of the first metallurgical submerged arc furnace 7-1. The first cooler 2-1 is configured to have an outlet temperature above 450℃. The pre-dust collector 3-1 uses a water-cooled gravity dust collector, configured to have an outlet temperature above 400℃. The high-temperature flue gas filter 4-1 uses metal or ceramic filter elements, configured to have an outlet temperature above 350℃. The second cooler 5-1 uses an air cooler, configured to have an outlet temperature above 300℃. The outlet of the fan 6-1 is connected to the direct gas delivery pipeline 1 via valve 8-1, and the temperature of the metallurgical submerged arc furnace gas at the outlet of the fan 6-1 is 300℃-400℃.

[0027] Similarly, the second metallurgical submerged arc furnace gas purification pipeline includes a first cooler 2-2, a pre-dust collector 3-2, a high-temperature flue gas filter 4-2, a second cooler 5-2, and a fan 6-2 arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The first cooler 2-2 uses a water-cooled flue, with its inlet connected to the gas outlet of the second metallurgical submerged arc furnace 7-2. The first cooler 2-2 is configured to have an outlet temperature above 450℃. The pre-dust collector 3-2 uses a water-cooled gravity dust collector, configured to have an outlet temperature above 400℃. The high-temperature flue gas filter 4-2 uses metal or ceramic filter elements, configured to have an outlet temperature above 350℃. The second cooler 5-2 uses an air cooler, configured to have an outlet temperature above 300℃. The outlet of the fan 6-2 is connected to the direct gas delivery pipeline 1 via valve 8-2, and the temperature of the metallurgical submerged arc furnace gas at the outlet of the fan 6-2 is 300℃-400℃.

[0028] In this embodiment, each component (including the first cooler, pre-dust collector, high-temperature flue gas filter, second cooler, and fan) in each metallurgical submerged arc furnace gas purification pipeline is configured to controllably and gradually decrease the temperature of the metallurgical submerged arc furnace gas during its flow according to a preset cooling gradient. Specifically, the outlet temperature of the first cooler is above 450°C, the outlet temperature of the pre-dust collector is above 400°C, the outlet temperature of the high-temperature flue gas filter is above 350°C, the outlet temperature of the second cooler is above 300°C, and the outlet temperature of the fan is 300°C-400°C. This ensures that the metallurgical submerged arc furnace gas temperature at the fan outlet is ≥250°C, effectively retaining the thermal energy of the metallurgical submerged arc furnace gas.

[0029] In this embodiment, the multi-line parallel processing system for metallurgical submerged arc furnace gas operates by having the high-temperature metallurgical submerged arc furnace gas (typically between 600℃ and 1200℃) generated by the first and second metallurgical submerged arc furnaces 7-1 and 7-2 respectively enter their corresponding purification pipelines for processing. As the gas flows through each component, it is gradually cooled according to a preset cooling gradient, simultaneously completing the purification process. Finally, the purified high-temperature metallurgical submerged arc furnace gas (300℃-400℃) is sent to the direct gas delivery pipeline 1 via its respective fans and valves. This pipeline directly delivers the purified high-temperature gas to the gas application point, enabling the application point to utilize both the gas composition and the heat energy carried by the metallurgical submerged arc furnace gas, eliminating the need for a gas holder in traditional processes.

[0030] The multi-line parallel treatment system for metallurgical submerged arc furnace gas in this embodiment not only achieves efficient purification of the furnace gas but also preserves its high-temperature characteristics, significantly improving energy utilization efficiency. Simultaneously, the parallel design of multiple metallurgical submerged arc furnace gas purification pipelines enhances the system's reliability and flexibility. When one pipeline requires maintenance, the others can continue operating, ensuring continuous system operation. The gas application point can be a gas combustion utilization point or a high-temperature chemical synthesis utilization point using gas as a raw material, respectively realizing different utilization methods of the gas's thermal energy and composition.

[0031] Taking a 5500KVA high-carbon chromite submerged arc furnace as an example, this furnace produces approximately 6000 standard cubic meters of furnace gas per hour with a CO content of over 90%. When the gas is used at a high-temperature chemical synthesis point (such as an ammonia production system requiring above 400℃, or a methanol synthesis system requiring above 300℃), the 300℃-400℃ high-temperature furnace gas provided by this system can directly meet the reaction temperature requirements. In contrast, the furnace gas temperature after treatment in traditional processes does not exceed 50℃, requiring additional heating of 250-350℃ to reach the temperature required for chemical synthesis. Based on this calculation, using this system can save 4.3-6 million kWh of heating energy per year, significantly reducing production costs and improving energy efficiency.

[0032] Example 2

[0033] like Figure 2 As shown, the metallurgical submerged arc furnace gas multi-line parallel processing system of this embodiment is an improvement on the first embodiment. The main difference is that a third cooler is added to each metallurgical submerged arc furnace gas purification pipeline.

[0034] Specifically, the first metallurgical submerged arc furnace gas purification pipeline includes a first cooler 2-1, a pre-dust collector 3-1, a high-temperature flue gas filter 4-1, a second cooler 5-1, a fan 6-1, and a third cooler 9-1 arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The configuration of the first cooler 2-1, pre-dust collector 3-1, high-temperature flue gas filter 4-1, second cooler 5-1, and fan 6-1 is the same as in Embodiment 1. The third cooler 9-1 is located between fan 6-1 and valve 8-1, and uses a water cooler or air cooler to ensure that the temperature of the metallurgical submerged arc furnace gas at the outlet of the third cooler 9-1 is ≥250℃.

[0035] Similarly, the second metallurgical submerged arc furnace gas purification pipeline includes a first cooler 2-2, a pre-dust collector 3-2, a high-temperature flue gas filter 4-2, a second cooler 5-2, a fan 6-2, and a third cooler 9-2 arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The configuration of the first cooler 2-2, the pre-dust collector 3-2, the high-temperature flue gas filter 4-2, the second cooler 5-2, and the fan 6-2 is the same as in Embodiment 1. The third cooler 9-2 is located between the fan 6-2 and the valve 8-2, and uses a water cooler or an air cooler to ensure that the temperature of the metallurgical submerged arc furnace gas at the outlet of the third cooler 9-2 is ≥250℃.

[0036] In this embodiment, each component (including the first cooler, pre-dust collector, high-temperature flue gas filter, second cooler, fan, and third cooler) in each metallurgical submerged arc furnace gas purification pipeline is configured to controllably and gradually decrease the temperature of the metallurgical submerged arc furnace gas during its flow according to a preset cooling gradient. Specifically, the outlet temperature of the first cooler is above 450°C, the outlet temperature of the pre-dust collector is above 400°C, the outlet temperature of the high-temperature flue gas filter is above 350°C, the outlet temperature of the second cooler is above 300°C, the outlet temperature of the fan is 300°C-400°C, and the outlet temperature of the third cooler is ≥250°C. This ensures that the temperature of the metallurgical submerged arc furnace gas supplied to the direct gas delivery pipeline 1 is ≥250°C, effectively preserving the thermal energy of the metallurgical submerged arc furnace gas.

[0037] The operation mode of the multi-line parallel processing system for metallurgical submerged arc furnace gas in this embodiment is basically the same as that in Embodiment 1. The difference is that a third cooler is added to further regulate the temperature of the metallurgical submerged arc furnace gas at the blower outlet, making the temperature of the metallurgical submerged arc furnace gas fed into the direct gas transmission pipeline 1 more stable and more conducive to its subsequent utilization at the gas application point. The gas application point can be a gas combustion utilization point or a high-temperature chemical synthesis utilization point using gas as raw material. According to different application requirements, the operating parameters of the third cooler can be flexibly adjusted to obtain the most suitable furnace gas temperature.

[0038] The addition of a third cooler makes the multi-line parallel processing system for metallurgical submerged arc furnace gas in this embodiment more precise in terms of temperature control, better adapting to the processing needs of metallurgical submerged arc furnace gas under different operating conditions, further improving the system's adaptability and flexibility, and providing a more reliable guarantee for the gas application point to realize the dual utilization of the gas composition and the heat energy carried by the metallurgical submerged arc furnace gas.

[0039] It is worth noting that the third cooler in this embodiment is not only used to precisely regulate the furnace gas temperature, but also to recover heat from the cooling process for comprehensive utilization. When the third cooler uses air cooling, the warm air generated during the cooling process can be collected and used as preheated air or supplementary gas source at the gas combustion point to improve combustion efficiency or as a gas source for other hot air needs; when the third cooler uses water cooling, the steam generated during the cooling process can be used as a heat source or reaction medium. Of course, the second cooler can also achieve heat recovery and comprehensive utilization.

[0040] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of this utility model.

Claims

1. A multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace, characterized in that: The system includes a direct gas transmission pipeline and multiple metallurgical submerged arc furnace gas purification pipelines connected in parallel to the direct gas transmission pipeline. Each metallurgical submerged arc furnace gas purification pipeline comprises a first cooler, a pre-dust collector, a high-temperature flue gas filter, and a fan arranged sequentially along the flow direction of the metallurgical submerged arc furnace gas. The inlet of the first cooler is connected to the outlet of the metallurgical submerged arc furnace gas, and the outlet of the fan is connected to the direct gas transmission pipeline through corresponding valves. Each metallurgical submerged arc furnace gas purification pipeline is configured to controllably and gradually decrease the temperature of the metallurgical submerged arc furnace gas during its flow according to a preset cooling gradient, so that the temperature of the metallurgical submerged arc furnace gas at the outlet of the fan is ≥250℃. The direct gas transmission pipeline is used to directly input the metallurgical submerged arc furnace gas output from these purification pipelines into the gas application point, so that the gas application point can achieve dual utilization of the gas composition and the heat energy carried by the metallurgical submerged arc furnace gas.

2. The multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace as described in claim 1, characterized in that: The first cooler uses a water-cooled flue.

3. The multi-line parallel processing system for metallurgical submerged arc furnace gas as described in claim 1, characterized in that: The pre-dust collector is a water-cooled gravity dust collector.

4. The multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace as described in claim 1, characterized in that: The high-temperature flue gas filter uses a metal filter element or a ceramic filter element as its filter element.

5. The multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace as described in claim 1, characterized in that: Each metallurgical submerged arc furnace gas purification pipeline also includes a second cooler installed between the corresponding high-temperature flue gas filter and the corresponding fan. The second cooler is configured to have an outlet temperature of over 300°C.

6. The multi-line parallel processing system for metallurgical submerged arc furnace gas as described in claim 5, characterized in that: The second cooler is an air cooler or an air-cooled unit.

7. The multi-line parallel processing system for metallurgical submerged arc furnace gas as described in claim 1, characterized in that: The first cooler is configured to have an outlet temperature of 450°C or higher, the pre-dust collector is configured to have an outlet temperature of 400°C or higher, and the high-temperature flue gas filter is configured to have an outlet temperature of 350°C or higher.

8. The multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace as described in claim 1, characterized in that: Each metallurgical submerged arc furnace gas purification pipeline also includes a third cooler installed between the corresponding fan and the corresponding valve, wherein the temperature of the metallurgical submerged arc furnace gas at the outlet of the third cooler is ≥250℃.

9. The multi-line parallel processing system for metallurgical submerged arc furnace gas as described in claim 8, characterized in that: The third cooler is either a water cooler or an air cooler.

10. The multi-line parallel processing system for furnace gas from a metallurgical submerged arc furnace as described in claim 1, characterized in that: The temperature of the furnace gas at the outlet of the blower is 300℃-400℃. And / or, the gas application point is a gas combustion utilization point or a high-temperature chemical synthesis utilization point using gas as raw material.

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