Power generation device for preheating by using submerged arc furnace gas power generation tail gas as heat source

Abstract

The utility model relates to the technical field of metallurgical energy conservation, in particular to a power generation device for preheating by using submerged arc furnace gas power generation tail gas as a heat source, which comprises a submerged arc furnace, a submerged arc furnace gas recovery processing device, a gas generator set, a denitration and desulfurization device and a preheating device, the submerged arc furnace gas recovery processing device is connected with the submerged arc furnace and the gas generator set and used for purifying gas generated by the submerged arc furnace and then sending the purified gas to the gas generator set for power generation, and the denitration and desulfurization device is connected with a tail gas exhaust port of the gas generator set and used for conducting denitration and desulfurization treatment on tail gas generated after power generation. The denitration and desulfurization device is connected with the preheating device and used for feeding tail gas subjected to denitration and desulfurization into the preheating device to preheat materials, and the preheating device is connected with the submerged arc furnace and used for feeding the preheated materials into the submerged arc furnace for smelting, so that energy waste caused by direct emission of high-temperature tail gas generated after power generation is avoided; and the demand on external energy in the preheating process is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical energy conservation, and particularly relates to a power generation device that uses the tail gas of power generation from submerged arc furnace gas as a heat source for preheating. Background Art

[0002] Submerged arc furnaces are developing towards the trend of being larger and more airtight. The purpose of making submerged arc furnaces larger and more airtight is to recover the gas generated during the smelting process. The ways of recycling and using the gas generally include power generation, being used as a heat source for drying raw materials, being used as a fuel for sintering ignition, and being used for producing methanol, etc. Among them, the most common and mature one is gas power generation.

[0003] The high-temperature dusty gas generated by the existing submerged arc furnace enters the gas holder after purification, and is led from the gas holder to an internal combustion engine for power generation. The tail gas generated by the power generation is directly discharged to the outside after desulfurization and denitrification. However, the temperature of the tail gas is about 500 degrees Celsius, which will cause serious energy waste.

[0004] In addition, the mixed ore generally needs to be preheated and reduced before entering the submerged arc furnace. For example, Chinese Patent No. CN114990336A, with the name of a preheating reduction device and a preheating reduction method, uses the high-temperature flue gas generated after the gas from the submerged arc furnace burns to preheat the mixed ore. It needs to set up a gas combustion device, which consumes the submerged arc furnace gas alone, and at the same time needs to control the emission concentration of nitrogen oxides and sulfur oxides. The overall energy conservation and environmental protection effect is not ideal. Summary of the Utility Model

[0005] The purpose of this utility model is to propose a power generation device that uses the tail gas of power generation from submerged arc furnace gas as a heat source for preheating. By using the tail gas (with a temperature of about 500 - 600 degrees Celsius) generated after gas power generation as a heat source and introducing it into the preheating device to preheat the mixed ore, it is no longer necessary to burn the submerged arc furnace gas alone to generate high-temperature flue gas for preheating the mixed ore, the energy utilization rate is improved, and the energy conservation effect is obvious.

[0006] To achieve the purpose of the present utility model, the following technical solutions are adopted:

[0007] A power generation device that uses the tail gas of a submerged arc furnace gas-powered generator as a heat source for preheating, comprising a submerged arc furnace, a submerged arc furnace gas recovery and treatment device, a gas-fired power generation unit, a denitrification and desulfurization device, and a preheating device. The submerged arc furnace gas recovery and treatment device is respectively connected to the submerged arc furnace and the gas-fired power generation unit to purify the gas generated by the submerged arc furnace and send it to the gas-fired power generation unit for power generation. The denitrification and desulfurization device is connected to the tail gas discharge port of the gas-fired power generation unit to perform denitrification and desulfurization treatment on the tail gas generated after power generation. The denitrification and desulfurization device is connected to the preheating device to send the tail gas after denitrification and desulfurization treatment into the preheating device for preheating the material. The preheating device is connected to the submerged arc furnace to send the preheated material into the submerged arc furnace for further smelting.

[0008] Further improvement lies in that the submerged arc furnace gas recovery and treatment device includes a first bag filter, a gas holder, and a gas booster station. The first bag filter is respectively connected to the submerged arc furnace and the gas holder to purify the gas generated by the submerged arc furnace and send it to the gas holder for storage. The gas booster station is respectively connected to the gas holder and the gas-fired power generation unit to send the gas in the gas holder to the gas-fired power generation unit for power generation.

[0009] Further improvement lies in that the preheating device is a distributed preheating system.

[0010] Further improvement lies in that a smoke exhaust fan, a heat preservation pipeline, and an induced draft fan are also provided between the denitrification and desulfurization device and the preheating device. The smoke exhaust fan is used to send the tail gas after denitrification and desulfurization treatment into the heat preservation pipeline, and the induced draft fan is used to send the tail gas in the heat preservation pipeline into the preheating device.

[0011] Further improvement lies in that the denitrification and desulfurization device includes a denitrification device and a desulfurization tower. The denitrification device is respectively connected to the tail gas discharge port of the gas-fired power generation unit and the desulfurization tower, and the desulfurization tower is connected to the preheating device.

[0012] Further improvement lies in that the power generation device further includes a second bag filter, a main smoke exhaust fan, and a chimney. The second bag filter is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag filter and the chimney to discharge the flue gas generated by the preheating device to the atmosphere after purification by the second bag filter.

[0013] The beneficial effects of the present utility model:

[0014] The utility model first purifies the gas generated by the submerged arc furnace and then sends it into a gas power generation unit for power generation, which can make full use of the gas resources generated by the submerged arc furnace. By treating the high-temperature tail gas generated after power generation with a denitration and desulfurization device first, the emissions of nitrogen oxides and sulfur oxides can be effectively controlled, meeting the current strict environmental protection standards. By using the tail gas after denitration and desulfurization as the heat source of the preheating device to preheat the material to be treated, not only the energy waste caused by the direct emission of the high-temperature tail gas generated after power generation is avoided, but also the demand for external energy in the preheating process is reduced. It is no longer necessary to separately burn the gas of the submerged arc furnace to generate high-temperature flue gas to preheat the material, improving the energy efficiency of the entire system. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a power generation device for preheating by using the tail gas of a submerged arc furnace gas power generation as a heat source according to an embodiment of the utility model. Detailed Embodiments

[0016] To make the purpose, technical solutions and advantages of the utility model more clear and understandable, the following further details the utility model in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the protection scope of the utility model.

[0017] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixedly provided on" or "installed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. Further, when an element is considered to be "drivably connected" to another element, the two can achieve power transmission, and its specific implementation can be realized by using the existing technology and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is perpendicular, but due to manufacturing and assembly effects, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0019] In the present utility model, "first" and "second" involved do not represent specific quantities and sequences, but are only used for name distinction.

[0020] Please refer to the attached Figure 1 In an embodiment of the present utility model, a power generation device for preheating by using the tail gas of a submerged arc furnace gas power generation as a heat source is proposed. The power generation device includes a submerged arc furnace, a submerged arc furnace gas recovery and treatment device, a gas power generation unit, a denitration and desulfurization device, and a preheating device. The submerged arc furnace gas recovery and treatment device is respectively connected to the submerged arc furnace and the gas power generation unit to send the high-temperature dust-containing gas generated by the submerged arc furnace to the gas power generation unit for power generation after purification. The denitration and desulfurization device is connected to the tail gas discharge port of the gas power generation unit to perform denitration and desulfurization treatment on the high-temperature tail gas (about 600 °C) generated after power generation. The denitration and desulfurization device is connected to the preheating device to send the high-temperature tail gas after denitration and desulfurization treatment into the preheating device to preheat the material (mixed ore). Through the convective heat transfer between the tail gas and the material, the material is heated to 400 - 500 °C. The preheating device is connected to the submerged arc furnace to send the preheated material into the submerged arc furnace for further smelting.

[0021] It can be understood that by first purifying the gas generated by the submerged arc furnace and then sending it to the gas power generation unit for power generation, the gas resources generated by the submerged arc furnace can be fully utilized. By first treating the high-temperature tail gas (about 600 °C) generated after power generation through the denitration and desulfurization device, the emissions of nitrogen oxides and sulfur oxides can be effectively controlled, meeting the current strict environmental protection standards. By using the tail gas after denitration and desulfurization as the heat source of the preheating device to preheat the material to be processed, not only the energy waste caused by the direct emission of the high-temperature tail gas generated after power generation is avoided, but also the demand for external energy in the preheating process is reduced. It is no longer necessary to separately burn the submerged arc furnace gas to generate high-temperature flue gas to preheat the material, improving the energy efficiency of the entire system.

[0022] In a feasible solution of this embodiment, the submerged arc furnace gas recovery and treatment device includes a first bag filter, a gas holder, and a gas pressure boosting station. The first bag filter is respectively connected to the submerged arc furnace and the gas holder to send the high-temperature dust-containing gas generated by the submerged arc furnace to the gas holder for storage after purification. The gas pressure boosting station is respectively connected to the gas holder and the gas power generation unit to send the gas in the gas holder to the gas power generation unit for power generation.

[0023] It can be understood that the first bag filter can effectively remove dust particles in the gas, reduce the risk of abrasion and blockage of subsequent equipment, improve the gas quality, and ensure the safety and stability of the operation of the generator set. After purification, the gas is sent to the gas holder for storage. The function of the gas holder is to balance the supply and demand of the gas and ensure that the gas generator set can continuously and stably obtain fuel. The gas pressurization station is responsible for pressurizing the stored gas to a pressure suitable for the operation of the generator set. The gas pressurization station is a key equipment to ensure the efficiency and stability of gas transmission.

[0024] In a preferred solution of this embodiment, the preheating device is a distributed preheating system. The distributed preheating system is composed of several preheating furnaces, and several preheating furnaces are distributed.

[0025] In a feasible solution of this embodiment, a smoke exhaust fan, a heat preservation pipeline and an induced draft fan are further arranged between the denitration and desulfurization device and the preheating device. The smoke exhaust fan is used to send the tail gas after denitration and desulfurization treatment into the heat preservation pipeline, and the induced draft fan is used to send the tail gas in the heat preservation pipeline into the preheating device.

[0026] It can be understood that the smoke exhaust fan is installed after the denitration and desulfurization device, and its function is to provide sufficient power to ensure that the treated tail gas can be continuously and stably transported into the heat preservation pipeline. The design of the heat preservation pipeline is to reduce the heat loss of the tail gas during transportation. The cooling of the high-temperature tail gas during transmission will reduce its preheating efficiency, and good heat preservation measures can effectively maintain the gas temperature and ensure that the preheating device can make full use of this part of heat energy to further improve the energy utilization rate. The induced draft fan is installed between the heat preservation pipeline and the preheating device, and its main function is to overcome the resistance at the inlet of the preheating device to ensure that the tail gas smoothly enters the preheating device.

[0027] In this embodiment, the denitration and desulfurization device includes a denitration device and a desulfurization tower. The denitration device is respectively connected to the tail gas discharge port of the gas generator set and the desulfurization tower. The temperature of the tail gas after denitration treatment is about 550 degrees Celsius. The desulfurization tower is connected to the preheating device. The temperature of the tail gas after desulfurization treatment is about 530 degrees Celsius. The temperature of the tail gas entering the preheating device through the induced draft fan is about 500 degrees Celsius.

[0028] In this embodiment, the power generation device further includes a second bag filter, a main smoke exhaust fan and a chimney. The second bag filter is connected to the exhaust port of the preheating device. The main smoke exhaust fan is respectively connected to the second bag filter and the chimney, and is used to discharge the flue gas generated by the preheating device into the atmosphere through the chimney after being purified by the second bag filter.

[0029] It can be understood that by setting up the second bag filter, the main exhaust fan and the chimney, not only the depth and breadth of smoke treatment are enhanced, but also the efficiency, safety and environmental protection of the flue gas emission process are ensured.

[0030] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0031] The above-described embodiments only represent the specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A power generation device using the tail gas of coal-fired electric power generation from an ore-fired furnace as a heat source for preheating, characterized in that: It includes an ore-fired furnace, an ore-fired furnace gas recovery and treatment device, a gas-fired generator set, a denitration and desulfurization device, and a preheating device. The ore-fired furnace gas recovery and treatment device is respectively connected to the ore-fired furnace and the gas-fired generator set for purifying the gas generated by the ore-fired furnace and sending it to the gas-fired generator set for power generation. The denitration and desulfurization device is connected to the tail gas discharge port of the gas-fired generator set for denitration and desulfurization of the tail gas generated after power generation. The denitration and desulfurization device is connected to the preheating device for sending the tail gas after denitration and desulfurization treatment into the preheating device for preheating the material. The preheating device is connected to the ore-fired furnace for sending the preheated material into the ore-fired furnace for further smelting.

2. A power generation device using coal gas from a submerged arc furnace as a heat source for preheating according to claim 1, characterized in that: The coal gas recovery and processing device of the electric arc furnace includes a first bag dust collector, a gas tank and a gas pressure station. The first bag dust collector is respectively connected to the electric arc furnace and the gas tank to purify the coal gas generated by the electric arc furnace and send it to the gas tank for storage. The gas pressure station is respectively connected to the gas tank and the gas generator set to send the gas in the gas tank to the gas generator set for power generation.

3. The power generation device according to claim 1, which uses the tail gas of coal-fired electric power generation from a submerged arc furnace as a heat source for preheating, is characterized in that: The preheating device is a distributed preheating system.

4. The power generation device according to claim 1, which uses the tail gas of coal-fired electric power generation from a submerged arc furnace as a heat source for preheating, is characterized in that: A smoke exhaust fan, an insulated pipe and an induced draft fan are also provided between the denitration and desulfurization device and the preheating device. The smoke exhaust fan is used to send the exhaust gas after denitration and desulfurization treatment into the insulated pipe, and the induced draft fan is used to send the exhaust gas in the insulated pipe into the preheating device.

5. The power generation device according to claim 1, which uses the tail gas of coal-fired electric power generation from a submerged arc furnace as a heat source for preheating, is characterized in that: The denitration and desulfurization device comprises a denitration device and a desulfurization tower. The denitration device is connected to the tail gas discharge port of the gas generator set and the desulfurization tower respectively, and the desulfurization tower is connected to the preheating device.

6. The power generation device according to claim 1, which uses the tail gas of coal-fired electric power generation from a submerged arc furnace as a heat source for preheating, is characterized in that: The power generation device also includes a second bag dust collector, a main smoke exhaust fan, and a chimney. The second bag dust collector is connected to the exhaust port of the preheating device, and the main smoke exhaust fan is respectively connected to the second bag dust collector and the chimney, and is used to purify the smoke generated by the preheating device through the second bag dust collector and then discharge it into the atmosphere through the chimney.

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